Loading...
The URL can be used to link to this page
Your browser does not support the video tag.
06-105692
F ILE CITY OF CITY HALL 33325 8th Avenue South Federal way Mailing Address: PO Box 9718 Federal Way,WA 98063-9718 (253)835-7000 www.cityoffederalway.com February 2, 2007 Andy Wilt Lakehaven Utility District(Water) PO Box 4249 Federal Way,WA 98003 RE: File#06-105692-00-UP; PRELIMINARY APPROVAL Lakehaven Well#21,35316 1st Avenue South Dear Mr. Wilt: The City has completed a:land use Process III review of your proposal to install filters to remove iron and manganese from the District's drinking water supply source known as Well 21.The filters and sedimentation tank will be placed south of the existing well house on asphalt-concrete paved area,and will encompass an area of approximately 350 square feet on the 81,589 square-foot property. Except where pipe connections are made to the filtration system,the piping and ancillary conduits and sedimentation tank will be below ground. An existing stormwater infiltration pond will be modified so that it may be utilized to contain the backwash water for groundwater infiltration. Pursuant to Federal Way City Code(FWCC)Chapter 22,Article VI, "Process III—Project Approval,"your proposal is found to be consistent with the provisions of Chapter 22, "Zoning." Your Process III proposal is hereby approved. STATEMENT OF FACTS AND FINDINGS 1. Zoning, Land Use, and Review Process—The zoning for the proposed site is Single-Family Residential (RS 35.0).Public Utilities are permitted in the RS zone pursuant to the zoning chart found in FWCC Section 22-644. For this particular proposal,the required land use review is Process III. The State Environmental Policy Act(SEPA)was reviewed by Lakehaven Utility District in October 2006. 2. State Environmental Policy Act(SEPA)—The responsible official of Lakehaven Utility District issued a Determination of Nonsignificance(DNS)on September 22, 2006,pursuant to the State Environmental Policy Act(SEPA). The comment and appeal period for this determination concluded on October 11,2006. 3. Site Conditions—The subject site is zoned RS 35.0, and is surrounded to the north,east, south,and west with the same zoning RS -35.0.The northeast corner of the parcel contains a small stream and associated wetland.The northeastern 1/3 of the parcel lies within the 200-foot wetland buffer.The property consists primarily of knolls of evergreen and deciduous trees within a lawn that slopes down to the north-east.The entrance driveway is ramped down to grade from 1S`Avenue South and leads to the well house located toward the rear of the property(east). The eastern half of the site has Mr.Wilt February 2,2007 Page 2 been developed with the well house driveway with turnaround/parking area, and the infiltration pond. 4. Critical Areas—The northeastern 1/3 of the parcel (which includes the existing well house, most of the existing paved parking area, and a portion of the existing detention pond)lies within the 200-foot wetland buffer. Approximately three of the eight filter tanks will be located within the wetland buffer area with the remaining five tanks being located outside the buffer. 5. Improvements in a Regulated Wetland Buffer—Pursuant to FWCC 22-1359(c),the Director of Community Development may permit the placement of an essential public facility,public utility or other public improvements in a regulated wetland buffer if she determines that the line or improvements must traverse the buffer because no feasible or alternative location exists based on an analysis of technology and system efficiency. The specific location and extent of the intrusion into the buffer must constitute the minimum necessary encroachment to meet the requirements of the public facility or utility. The applicant demonstrates that the location of the filter tanks provide the least amount of impact to the existing site conditions,preserves the wetland buffer area to the greatest extent possible, and minimizes impervious surface impacts. 6. Landscaping/Design—Pursuant to FWCC 22-1634(f)(2)(b), site utilities including fire standpipes and engineered retention ponds should not be the dominant element.of the front landscaped area. When these must be located in a front yard, they shall be either underground or screened by walls or a Type I landscaping.The existing vegetation was determined to provide required screening of the site to ensure that site utilities,including retention ponds, will not be the dominant element of the front landscape area. Pursuant to FWCC 22-1564(b), all outside storage areas shall be fully screened by Type I landscaping a minimum of five feet in width. At the proposed location in the southeast corner of the parking lot,the filtration tanks are visible from IS`Avenue South.The applicant demonstrated that the installation of a six-foot screened gate will provide adequate screening in place of the landscaping along the west side of the filtration tanks due to reasons of accessing the site,and site constrictions. CLOSING This decision shall not waive compliance with future City of Federal Way codes,policies,and standards relating to this site. Final construction drawings will be reviewed for compliance with specific regulations and other applicable City requirements.This Process III approval does not constitute approval of an electrical permit. The effective date of this decision is February 2, 2007. Pursuant to FWCC Section 22-355, any person who received notice of the administrative decision may appeal this decision to the Director of Community Development by February 16, 2007. Generally,no work on the proposal may commence until the end of the appeal period. For this project you are the only party receiving notice. You may waive your right to an appeal by letter, or you may simply wait for the appeal period to end. If a building or electrical permit is required,you may not commence work until you have been issued the appropriate permit(s). This Process III approval is valid for one year from the effective date of this decision. If no further action is taken within one year,this decision will expire. A one-time, six-month extension may be granted only if a written request is submitted to the City's Department of Community Development Services(33325 8`t' 06-105692 Doc.1.D.39225 Mr. Wilt February 2,2007 Page 3 Avenue South, PO Box 9718, Federal Way, WA 98063-9718) at least 30 days prior to the expiration of the decision. If you have any questions,please contact Associate Planner Laura Kim at 253-835-2641, or laura.kim@cityoffederalway.com. Sincerely, Kathy McCv`lung Director of Community Development Services enc: Approved Plans c: Laura Kim,Planning Department Kevin Peterson,Public Works Sarady Long,Traffic • 06-105692 Doe.1.D.39225 F I LE j , CITY OF CITY HALL �. Federal Way 33530 1st Way South•PO Box 9718 Federal Way,WA 98063-9718 (253)661-4000 www.ci tyoffedera l way.corn • November 28, 2006 Lakehaven Utility District(water) Attn: Andy Wilt PO Box 4249 Federal Way, WA 98003 RE: File#06-105692-00-UP; LETTER OF COMPLETENESS Lakehaven Well#21,35316 1st Avenue South,Federal Way Dear Mr. Wilt: The Department of Community Development Services received your Process III application on November 6, 2006. The proposed site is zoned Single-Family Residential(RS 35.0).Pursuant to City regulations, upon receipt of an application the City has 28 days to determine whether all required information and documentation required for a complete application pursuant to Federal Way City Code (FWCC) Section 22-33 has been submitted. Based on a review of your submittal, staff has deemed your application to be complete as of November 22,2006. Having met the submittal requirements,your application is now ready for processing. Within 120 days of the issuance of the letter of completeness,the Director of Community Development Services will endeavor to issue a decision on the Process III project. The 120-day clock is stopped any period during which the applicant has been requested by the City to correct plans,perform required studies,or provide additional information. If you have any questions,I can be reached at 253-835-2641 or laura.kim@cityoffederalway.com. Sincerely, (1c0A A 440A, Laura Kim Associate Planner c: Kevin Peterson,Public Works Maryanne Zukowski,Traffic Laura Kim,Planning • • 06-105692 Doc.I.D.38879 RESUBM1ENT OF COMMUNITY DEVELOPMENT SERVICES 33325 8`h Avenue South CITY OF err/r JAN $ 91007 PO Box 9718 Federal Way WA 98063-9718 Fed eral Way CITY OF FEDERAL WAY 253-835-2607;Fax 253-835-2609 BUILDING DEFT. www.cityoffederalway.com RESUBMITTAL INFORMATION This completed form MUST accompany all resubmittals. **Please note: Additional or revised plans or documents for an active project will not be accepted unless accompanied by this completed form. Mailed resubmittals that do not include this form or that do not contain the correct number of copies will be returned or discarded. You are encouraged to submit a//items in person and to contact the Customer Service Counter prior to submitting if you are not sure about the number of copies required. ** Project Number: 0 ro - / 0 g a- - O O - U P Project Name: kikrii9W1/ W47-1— ? 1 Project Address: 3 5 3 /G / S M4-4/c-f ,_ TN, F#Dt 4)-4/ Project Contact: kitipr j)/ L- T Phone: a��� -?q5- /57 2 RESUBMITTED ITEMS: #of Copies ** Detailed Description of Item MJELL Pt eJ'' f' 74 r8-a741 ,7 eL, **A/ways submit the same number of copies as required for your initial application.** Resubmittal Requested by : GAd( IC/ Letter Dated: / / y / a(767 (Staff Member) RESUB#: I Distribution Date: 1 By Dept/Div Name # 'escription Building � � Planning 3 aeC PW Fire Other • Bulletin#129—August 8,2006 Page 1 of 1 k:\Handouts\Resubmittal Information _ -_-- �_-- --_L_ N.W Sectio _�, Range 21 N., Township 4 E. r - .a.,.... ,,.. , ,..,... i ,...,...,, ... . ,,,,,,,,r,„:„.,, gi , ___. , . A. .....,_. , , _. 1 , ,.„,. ,...,.,.. .. ,.....,... , I!. ••••,,,„,,,,,.,_ 1a. ,," 1 1.�t.�7. ......, 1 ,, i‘_., mip. • ,.„. , ,,,,..._ .......,. . i . , ,,,, . Project 1 , iiv �1`� Location ��o ,,,,, i i ' 1 EDGE OF WETLAND BOUNDARIES I PER CITY OF FW V'LTLANDS I I SHAPE FILE \ 1 i Q \ , Vicinity Map /'STREAM BASED ON CONTOURS AS 1 Not to Scale I \ / PROVIDED BY CITY OF FW 1 8"PVC SS N 292104-9154 \/ 1 I \ STREAM AS DIGITIZED FROM Site Statistics 1 1 DISTRICT RECORD DRAWING I Site Area= 81589 sq ft r �'�' ._ _ — A. i Impermeable Surface Construction: 1 5' SETBACK LINE \_- 3 I Pad for Filter: 180 sq ft 1 APPROX. TREE LINE I \I 1 6 I '. I o RIP-RAP—,\ \ a i CV Vault Tank 152 sq ft J I CV Vault 20 sq ft i ! I RESTRICTOR MH I.E.-197.50 Y I \ I Less Exist Asph 352 sq ft >< ¢ W 3/4"ORIFICE i --; 18' I-.a-- IL, I.E.-198.0 Z wI Ii ,.... \ Total 0sgft 1 r 60' ( I� �i� CHEMICAL ! I 3owl l8 • P SUPPLY of I Occupancy: None - I m o� a uG POWER I - I Parking Stalls None 1 •. iw 'LE.zoo.s l --- -� I 1 t� "o 18 2921049031 ti -WELL 93• I \� i iZ I o ^ HOUSE C • K•VALVE Cl) r 1m 16 DETENTION BELOW WELL IN T 1 1 rig. a .202'=2380cf 1 1 '0 1�'ICMP STORM DRAIN \' j ;�/ I m t;t" ' I �I, c� i �A i1 RAW WATER g \ 1 s�" 7(( 1111�' XFMR PIPING o I {✓ 1 I EDGE OF 12 WIDE PAVEMENT A E-201 0 I •}♦�..1 `� / �'�;��"�. I � CHECK DAM 1 I 0 i I � ��'�►T �114 �oh, ELEV.-204.50 ! . Mg i r- I 1. i ` �' 1 GATE ' �• i��?,r\ ASPHAI T ! WATER PIPING e 1i � ! E GATE 1 FILTER A35EMBLV I I I �l I 12"DI W �_-__________ -— .:Ni 1 1 ! 5' ETBAC LINE AIR GAP 1 I SAMPLE STATION o ._ - I AP P R . \TED 1 P■■ 2921049069 OIE ? 1 I I w o FIN/SLAT loco(FOREST GREr N) I` Dept., tf l i V a� _ . 1 �r- i.�evelo anent i i B SAP I I y i ' I pate -----..__ I 2921049078 i ---- I • i i I I I 1 1 iI 1J i i • -•• / LAKEHAVEN UTILITY DISTRICT 200' SETBACK LINE / KING COUNTY WASHINGTON ,`` -- -- -- ------1'--lt"----------- --'-- ---- ---------- -- --.---- ------------ - -- ------------ -- RESUBMITTED Well 21 Water Filtration SITE PLAN JAN 2 9 2007 DATE:1/19/07 SCALE:NOTED SITE PLAN —° SCALE:�•_ CITY OF FEDERAL WA :. `1 SHEET 1 Note:Contours as provided BBl 1�Lnrt�J NN FFPT. CirriOF 2 ° by City of Federal Way FILTER WELL Z11114�2IC- 1�Q7 APPR:DTI' s 1 1 I fay / ' lc' ' 5 4167- C-iQ14 l'/iS I 1 (NoT t) 1 I I EDGE OF WETLAND BOUNDARIES PER CITY OF FW WETLANDS 1 ((II SHAPE FILE \ 1 0 \ 00 STREAM BASED ON CONTOURS AS 1 i \ PROVIDED BY CITY OF FW 8"PVC ss � 2921049154 \ 1 \ STREAM AS DIGITIZED FROM 0 O - O 0 0 0 DISTRICT RECORD DRAWING _ _ - p =- P 5' SETBACK LINE -' — 405.16'-- o - 1 — — _ - � e - 1/ I APPROX. TREE LINE \I C RIP-RAP �► � RESTRICTOR MH --i i W 3/4''ORIFICE v LE.^ 197.50 0 i 18' w • I.E. 198.0 60' Iz >��r; z ti z ---CHEMICAL w N 401 ROW P SUPPLY o �► I m O� > c� • �i U- -UG POWER I r 11E.200.5 c i J o �a 2921049031 �`ti WELL 93' 0 i z I N � HOUSE -C . K-VALVE , Cl') ,3 DETENTION BELOW WELL . IN V .T �v//J m I 202'=238Ocf r I ►► o 1 ►'CMP STORM GRAIN „� , rr W ¢ t- I I � 6, C' i1 -RAW WATER 1 ��0 ,I 'i XFMR PIPING :N6 Q 1 _ �► EDGE OF 12' WIDE PAVEMENT .,o oir . }� c� 1 , ,/,° . iVI ,.E.-201.0 CO I I41( 104, I. CHECK DAM o • I71411111161,.... ,,/" ELEV--204.50 1 G•TE ��/I►���'-y ASP ��rjj 1 - -FILTERED 0 / / � f, rn WATER PIPING f► ��� GATE T� ,� /1.' _ _ -FILTER ASSEMBLY I I 12"DI W € i ` (18'x10') 1 2"WATER SERVICE , -6"DISCHARGE 0 0 I 5' ETBAC LINE RECEIVED 1 - - — — . 405-06' ~��.�. — _1 -AIR GAP RECEIVED N. _____ I I SAMPLE STATION �-.,\_____ -_, e _ \ _ - pra• I 2921049069f+BURIED BACKWASH NOV ► 6 2006 - -i I TANK(8'x19'x8',6460 t. Q s 1 GAL) C' BUILDING D PT, 1 ai , '� �' $ 4I 1 n i:-, • 1: ''''t,'...• 't r.**,,,,,,,,,.:; !'''..., . _ :,,,IF. : °•'. ,°°_,.=,,, ,„ ..ov:f• 0. -:.!p,..••;,74i, ..A4 t ��Li`� �€ r ���0j �, `�+., .. - k. why „ . ": 7.**V-S'''.',":11"!'gV." -'•'' ',,'''', ' -- . ?" .:,s':4'.,,--„.. --..04,,..,.;...."1:-,k4'.**1.;;-'" 1.- ^*,, ‘, - 't,,\,. ,at,„„t‘,,,,,, ,,',.... ‘ � F` wsS � S:'�+i ice. 3 k� ti 3 R.'-' . .. �` "y-�*R, ^ a. ` ` �-r }y,jai 'G`v �� Vi 4"l °WM ' F4 / r sz/ KE" �u r/f RECEIVED NOV 0 6 7.006 CITY BUILDINGOF DEPT.FEDERAL WAY � � # h��R y. `,..,.:• v,,,,: fi's +a;yam'....,,,t,,, '.44..._ ^ °a .y r v ,,' '7',IP.Aq• ,,,..! ";:i•ze . ,.„-', -'',.':`,'", ,. ,,,,,,,,-,.. ',,• t i ...''''C',:,:4,.,*','"*.‘!,.'-' "•.'„'..:i.'*,,vy k,..,•• •• •••„;,..."''''',:•••,,' IV,;,''''''-.1]'" -" :-,r$,,,,t,4, ..-,::-..:i,::•.7.,..,,:::Ai.::g.,.-.- .,,...;,,,,,„,i,,,,,,Itt,,,,,,-.•-, ,, � � �. � .: � e� .t. `�M 4 mac. .� �, 'a s a - set 9 s- '� _-� em�ss.. � t G. -\ �QO f i/ir]G "5 r (f)0 QR( dE i9/) //a,—yt / s% ,�fri uG your RECEIVED NOV 0 6 2006 CITY OF FEDERAL WAY BUILDING DEPT. * h7 a & a'''''''''::.::::::'41...::.:''.:i*,00<, . ..' , . .;:',.1•":::..'1...:.,,,:-,11:iF..:. ...':. .: .-='• :441011111,0‹' ......,Z, "illi.f1"1,k,,-,',7-];:.::.'illi itil„ r �'4's • �:R.Ei A 3 t,oc�ff/.U� �V��'Ti�/ 03 ' Ftio RECEIVED NOV 0 6 ?_006 CITY OF FEDERAL WAY BUILDING D . µ :mo•w- , .� r .', eF -'<„,„- , ,., ----, T., .,, , ;,.,Avit. ,,,,,,t<1 „0<,, ,ft, * '*-kt ..(.. w 1 Ur y�Wd'r1 g,"'� •. T .2 `mom'". �, x - -..,..,,i.„,,,.:,:ts talc-4- --..7ag'A,,c. ,y4F.A:iis*4 17-7.0orvi-to:i -,..•'4.-4::‘,4„5„ ,-.-...„.•r ,c,,,....„: ,,,,,,..„......„;,,tili.,,,,..-,,,,,,,,,,' .11.4--:1LS:„,`t, - ‘,- , <"°- - 7-7 ilt- ,- A.. ' .,--:10+1i,:s.w: A -.I', . ''t -:"„ •',.. - ,;, .,•-•-•.,-_,P,..,..i.vit,.: ,- - , ',.•,'-f*--::k-•••:•-""'"U*i ;;,1**--‘....1 -.:-.4....,', -,,,,,.. i--- -..ii,..,?'..-:, ; A*0-7,iiit'-r'',1**„.-.4,.. rf,*.." , ,,z17"-- ' - ' .,-. ',,,.-° 'I, <. •4, ' +� 0 L 00tr ivt G- A'''' lrff dJ4 r F/q� PA' VE�Jf / /1E.Ki f Pit c�j��5 F � Loc nab RECEIVED NOV 0 6 2006 CITY OF FEDERAL WAY BUILDING DEPT. %3emu £ iii; : a p I';., � � ,'ate � .,� '•� .•f ae x1� { '... ..a.a ">ms° �a � L`:'e.a � ,- . a a " a .a �r � `< L. oofcjit'6- w�5 7— 0 RECEIVED NOV 0 6 2006 CITY OF FEDERAL WAY BUILDING DEPT. � eta S3 j$am �� . * t a, :>.> ga >.. ,,:,,A .,f;t2,,. - � _ = � �� � .;�� "fir° � � :" . � F • ' y�.� -a✓.` * ,mom is m�. �^ fi `vd it/ 5c�u f/71 6 ��0711 �7l r5 Ti.uc.-- ed47 L , RECEIVED NUV 0 6 2006 CITY OF FEDERAL WAY BUILDING DEPT. ` CITY OF CITY hL Federal Way 33325 8th Avenue South Mailing Address: PO Box 9718 Federal Way,WA 98063-9718 (253)835-7000 TTED wwwcityoffederalway.com RESUBMITTED I JAN 2 9'2007 Mr. Andy Wilt January 4, 2007 Lakehaven Utility District(Water) CITY OF FEDERAL WAY PO Box 4249 BUILDING DEPT. Federal Way, WA 98003 Re: File#06-105692-00-UP; REQUEST FOR ADDITIONAL INFORMATION Lakehaven Well#21; 35316 1st Avenue South, Federal Way Dear Mr. Wilt: The above referenced application was submitted to the City on November 6, 2006, and was determined complete on November 28, 2006. A public notice of the application was issued in accordance with code requirements on December 8, 2006, and a Determination of Nonsignificance (DNS)was issued under the State Environmental Policy Act(SEPA) on October 11, 2006, by the Lakehaven Utility District. The purpose of this letter is to convey technical comments on the landscape plan, which must be addressed prior to issuance of the Process III decision. Please submit three copies of the landscape plan, revised according to these comments, accompanied by the City's resubmittal form(enclosed). Landscaping/Design Criteria • • Pursuant to Federal Way City Code(FWCC) Section 22-1564(b), all outside storage areas shall be fully screened by Type I landscaping a minimum of five feet in width. At the proposed location in the southeast corner of the parking lot, it appears that the filtration tanks will be visible from 1st Avenue South. The west facade of the tanks need to be screened with solid fence of adequate height to shield the tanks from the right of way. Five feet of Type I landscaping will not be required given the tight turning radius on the site and the distance of the filtration tanks from the right-of-way. If you have any further questions, please contact me at Laura.kifn@cityoffederalway.com, or 253-835-2641. Upon receipt of the landscape plans as requested above, the City will review for preliminary approval. Sincerely, Laura Kim Associate Planner Enc: Resubmittal Form c: Scott Sproul,Acting Building Official Kevin Peterson, Public Works Engineering Plans Reviewer Doc.1 D-39116 Ah6, CITY OF CITY HALL 33325'8th Avenue South.. Federal Way Mailing Address: PO Box 9718 Federal Way,WA 98063-9718 (253)835-7000 www.cityoffederalway.corn Mr. Andy Wilt January 4, 2007 Lakehaven Utility District(Water) PO Box 4249 Federal Way, WA 98003 Re: File#06-105692-00-UP; REQUEST FOR ADDITIONAL INFORMATION Lakehaven Well#21; 35316 1st Avenue South,Federal Way Dear Mr. Wilt: The above referenced application was submitted to the City on November 6, 2006, and was determined complete on November 28,2006. A public notice of the application was issued in accordance with code requirements on December 8, 2006, and a Determination of Nonsignificance(DNS)was issued under the State Environmental Policy Act(SEPA) on October 11, 2006,by the Lakehaven Utility District. The purpose of this letter is to convey technical comments on the landscape plan,which must be addressed prior to issuance of the Process III decision. Please submit three copies of the landscape plan, revised according to these comments, accompanied by the City's resubmittal form(enclosed). Landscaping/Design Criteria • Pursuant to Federal Way City Code(FWCC) Section 22-1564(b), all outside storage areas shall be fully screened by Type I landscaping a minimum of five feet in width. At the proposed location in the southeast corner of the parking lot, it appears that the filtration tanks will be visible from 15t Avenue South. The west facade of the tanks need to be screened with solid fence of adequate height to shield the tanks from the right of way. Five feet of Type I landscaping will not be required given the tight turning radius on the site and the distance of the filtration tanks from the right-of-way. If you have any further questions,please contact me at laura.kim(4cityoffederalway.com, or 253-835-2641. Upon receipt of the landscape plans as requested above, the City will review for preliminary approval. Sincerely, (Awite4re.„. Laura Kim Associate Planner Enc: Resubmittal Form c: Scott Sproul,Acting Building Official Kevin Peterson,Public Works Engineering Plans Reviewer Doc.i.D.39116 DEPARTMENT OF COMMUNITY DEVELOPMENT SERVICES 33325 8th Avenue South PO Box 9718 CITY OF Federal Way WA 98063-9718 + 253-835-7000; Fax 253-835-2609 e • ra I aywww.cityoffederalway.com DECLARATION OF DISTRIBUTION C-e-<<— hereby declare, under penalty of perjury of the laws of the State of Washington, that a: Notice of Land Use Application/Action ❑ Land Use Decision Letter ❑ Notice of Determination of Significance ❑ Notice of Public Hearing before the (DS) and Scoping Notice Hearing Examiner ❑ Notice of Environmental Determination ❑ Notice of Planning Commission Public of Nonsignificance (SEPA, DNS) Hearing ❑ Notice of Mitigated Environmental ❑ Notice of LUTC/CC Public Hearing Determination of Nonsignificance (SEPA, MDNS) ❑ Notice of Application for Shoreline Management Permit ❑ Notice of Land Use Application & Anticipated DNS/MDNS ❑ Shoreline Management Permit ❑ FWCC Interpretation ❑ Adoption of Existing Environmental Document ❑ Other was 0 mailed 0 faxed 0 e-mailed and/or Xposted to or at each of the attached addresses on , 2006. Project Name c_ACC \f\c,_rp L),52A\ ? ,\ File Number(s) � - I(`5(c c) - Signature / Date /9/Z/jz?c ,7 K:\CD Administration Files\Declaration of Distribution.doc/Last printed 10/23/2006 1.47:00 PM r9,c,12_ ( Vicinity s 34r •Vicinity Map i b148 ST t , �. IIP Rffri g NI0114 4 al N VII , NIL 11 Al i it( f54,,It!!;141 wig �� 04elm. Proposed Site ilNO ��' SW 353 * al -imam '1w: RP rOmen ' ER. a. Warn W • , , il - k 41. '--- --. .. \-J _I KM 1 Z ci. hit - .3 Ad" mmri I • • N \ / W E S CITY OF Feder NOTICE OF LAND USE APPLICATION Lakehaven Well #21 Project Description: The proposal is to install a filtration system that intrudes 90 square feet into an existing wetland buffer at 35316 ls`Avenue South. The filtration system removes iron and manganese from the District's drinking water supply source known as Well 21. The filters and sedimentation tank will encompass an area of approximately 350 square feet on the 81,589 square-foot property placed south of the existing well house on an existing asphalt-concrete paved area. The approximate 70 feet of 12-inch pipe, as well as ancillary conduits, will be below ground. There will be a modified infiltration pond that will be utilized to contain the backwash water for groundwater infiltration. The new facility will be constructed inside an existing secured fenced area on the property owned by the District. Location: 35316 1st Avenue, Federal Way Applicant: Lakehaven Utility District(Water),Attn: Andy Wilt PO Box 4249; Federal Way, WA 98003 Staff Contact: Laura Kim, Associate Planner, 253-835-2641 Date Application Received: November 6, 2006 Date of Notice of Application: December 13, 2006 Date Determined Complete: November 28, 2006 Comment Due Date: December 27, 2006 Permits Required by This Application: Use Process III Approval (File#06-105692-UP), SEPA (Determination of Non-significance issued by Lakehaven Utility District on October 11, 2006). Other Permits Known at This Time and not Included in This Application: Building Permits Relevant Environmental Documents are Available at the Address Below: X Yes No Development Regulations and City Plans to be Used for Project Review and Consistency Known at This Time: Federal Way City Code (FWCC)Chapter 18, "Environmental Protection";FWCC Chapter 19, "Planning and Development"; FWCC Chapter 21, "Surface and Stormwater Management"; and FWCC Chapter 22, "Zoning."The project will be reviewed for consistency with all applicable codes and regulations including the FWCC; King County Surface Water Design Manual; and the International Building, Fire, and Mechanical Codes. The official project file is available for public review at the Department of Community Development Services (33325 8"'Avenue South, PO Box 9718, Federal Way, WA 98063-9718). Any person may submit written comments on the land use application or the environmental impacts of the proposal to the Director of Community Development Services by 5:00 p.m. on December 27,2006. Only persons who submit written comments to the Director, or specifically request a copy of the decision, may appeal the Process III decision. Details of appeal procedures for the requested land use decision will be included with the written decision. Published in the Federal Way Mirror on December 13, 2006. 06-105692 Doc.I.39067 F i LE CITY OF Federal Way NOTICE OF LAND USE APPLICATION Lakehaven Well #21 Project Description: The proposal is to install a filtration system that intrudes 90 square feet into an existing wetland buffer at 35316 1st Avenue South.The filtration system removes iron and manganese from the District's drinking water supply source known as Well 21. The filters and sedimentation tank will encompass an area of approximately 350 square feet on the 81,589 square-foot property placed south of the existing well house on an existing asphalt-concrete paved area.The approximate 70 feet of 12-inch pipe,as well as ancillary conduits, will be below ground. There will be a modified infiltration pond that will be utilized to contain the backwash water for groundwater infiltration.The new facility will be constructed inside an existing secured fenced area on the property owned by the District. Location: 27403 Pacific Highway South,Federal Way Applicant: Lakehaven Utility District(Water),Attn: Andy Wilt PO Box 4249; Federal Way,WA 98003 Staff Contact: Laura Kim,Associate Planner, 253-835-2641 Date Application Received: November 6,2006 Date of Notice of Application: December 13, 2006 Date Determined Complete:November 28, 2006 Comment Due Date: December 27, 2006 Permits Required by This Application: Use Process III Approval (File#06-105692-UP), SEPA (Determination of Nonsignificance issued by Lakehaven Utility District on October 11,2006). Other Permits Known at This Time and not Included in This Application: Building Permits Relevant Environmental Documents are Available at the Address Below: X Yes No Development Regulations and City Plans to be Used for Project Review and Consistency Known at This Time: Federal Way City Code(FWCC)Chapter 18, "Environmental Protection";FWCC Chapter 19, "Planning and Development"; FWCC Chapter 21, "Surface and Stormwater Management";and FWCC Chapter 22, "Zoning."The project will be reviewed for consistency with all applicable codes and regulations including the FWCC;King County Surface Water Design Manual; and the International Building, Fire, and Mechanical Codes. The official project file is available for public review at the Department of Community Development Services(33325 8th Avenue South,PO Box 9718,Federal Way,WA 98063-9718). Any person may submit written comments on the land use application or the environmental impacts of the proposal to the Director of Community Development Services by 5:00 p.m.on December 27,2006. Only persons who submit written comments to the Director,or specifically request a copy of the decision,may appeal the Process III decision. Details of appeal procedures for the requested land use decision will be included with the written decision. Published in the Federal Way Mirror on December 13, 2006. 06-105692 Doc.1.D.39067 f . Vicinity Map Iswar \ ,7 8 ST 7.Q wsw l - co / III Pi. Q 6W42£T I I_ I I Xi M VIA III sew rib" ♦�., �� Proposed Site � 1� SW 353 e... I SW a -- f I 1 S356ST / U mg , co > r�9 `� s 371111 r-1 midi I N • /— W / E S 194. DEPARTMENT OF COMMUNITY DEVELOPMENT SERVICES 33325 8'h Avenue South PO Box 9718 CITY OF Federal Way WA 98063-9718 Federal ' � 253-835-7000; Fax 253-835-2609 ywww.cityoffederalway.com DECLARATION OF DISTRIBUTION hereby declare, under penalty of perjury of the laws of the State of Washington, that a: 131 Notice of Land Use Application/Action ❑ Land Use Decision Letter ❑ Notice of Determination of Significance 0 Notice of Public Hearing before the (DS) and Scoping Notice Hearing Examiner ❑ Notice of Environmental Determination ❑ Notice of Planning Commission Public of Nonsignificance (SEPA, DNS) Hearing ❑ Notice of Mitigated Environmental ❑ Notice of LUTC/CC Public Hearing Determination of Nonsignificance (SEPA, MDNS) ❑ Notice of Application for Shoreline Management Permit ❑ Notice of Land Use Application & Anticipated DNS/MDNS ❑ Shoreline Management Permit ❑ FWCC Interpretation ❑ Adoption of Existing Environmental Document ❑ Other was ❑ mailed ❑ faxed Se-mailed and/or 0 posted to or at each of the attached addresses on c, , 2006. —� Project Name .akQ },Z ) a 1 File Number(s) 0 6 - Jt)5 6 9 - OP Signature Date K:\CD Administration Files\Declaration of Distribution.doc/Last printed 1/23/2006 8:42 AM CITY OF Federal Way NOTICE OF LAND USE APPLICATION Lakehaven Well #21 Project Description: The proposal is to install a filtration system that intrudes 90 square feet into an existing wetland buffer at 35316 ls`Avenue South.The filtration system removes iron and manganese from the District's drinking water supply source known as Well 21. The filters and sedimentation tank will encompass an area of approximately 350 square feet on the 81,589 square-foot property placed south of the existing well house on an existing asphalt-concrete paved area.The approximate 70 feet of 12-inch pipe,as well as ancillary conduits, will be below ground. There will be a modified infiltration pond that will be utilized to contain the backwash water for groundwater infiltration.The new facility will be constructed inside an existing secured fenced area on the property owned by the District. Location: 27403 Pacific Highway South, Federal Way Applicant: Lakehaven Utility District(Water), Attn: Andy Wilt PO Box 4249; Federal Way, WA 98003 Staff Contact: Laura Kim,Associate Planner, 253-835-2641 Date Application Received: November 6, 2006 Date of Notice of Application: December 13, 2006 Date Determined Complete: November 28, 2006 Comment Due Date: December 27,2006 Permits Required by This Application: Use Process III Approval (File#06-105692-UP), SEPA (Determination of Nonsignificance issued by Lakehaven Utility District on October 11, 2006). Other Permits Known at This Time and not Included in This Application: Building Permits Relevant Environmental Documents are Available at the Address Below: X Yes No Development Regulations and City Plans to be Used for Project Review and Consistency Known at This Time: Federal Way City Code(FWCC)Chapter 18,"Environmental Protection"; FWCC Chapter 19, "Planning and Development"; FWCC Chapter 21, "Surface and Stormwater Management"; and FWCC Chapter 22, "Zoning."The project will be reviewed for consistency with all applicable codes and regulations including the FWCC;King County Surface Water Design Manual; and the International Building, Fire, and Mechanical Codes. The official project file is available for public review at the Department of Community Development Services(33325 8th Avenue South,PO Box 9718,Federal Way,WA 98063-9718). Any person may submit written comments on the land use application or the environmental impacts of the proposal to the Director of Community Development Services by 5:00 p.m. on December 27,2006.Only persons who submit written comments to the Director, or specifically request a copy of the decision,may appeal the Process III decision.Details of appeal procedures for the requested land use decision will be included with the written decision. Published in the Federal Way Mirror on December 13,2006. 06-105692 Doc.1.D.39067 Tamara Fix Re: Legal Notice Page From: Teryl Heller <theller@fedwaymirror.com> To: "Tamara Fix" <Tamara.Fix@cityoffederalway.com> Date: 12/11/2006 10:50:32 AM Subject: Re: Legal Notice Thanks, Tamara. Will do. Hope your Christmas is going great. On Dec 11, 2006, at 10:21 AM, Tamara Fix wrote: > Please publish the following legal notice (Lakehaven#21 NOA, > 06-105692)in Wednesday's (Dec. 13, 2006) issue. > Please furnish an affidavit of publication. >Tamara Fix >Administrative Assistant > City of Federal Way > PO Box 9718 > Federal Way, WA 98063-9718 >253-835-2602 . FEDERAL WAY Mil ID) o) IH� 1 \J \) - Your Community Newspaper - Affidavit of Publication Debbie Kaufman,being first duly sworn on oath, deposes and says that she is the Publisher of The Federal Way Mirror, a semi-weekly newspaper. That said newspaper is published in the English language continually as a semi-weekly newspaper in Federal Way, King County,Washington, and is now and during all of said time has been printed in an office maintained at the aforementioned place of publication of said newspaper. That the annexed is a true copy of a legal advertisement placed by City of Federal Way L-1178 as it was published in regular issues (and not in supplemental form) of said newspaper once each week for a period of one consecutive week(s), commencing on the 13th day of December, 2006 , and ending on the 13th day of December, 2006, both dates inclusive, and that such newspaper was regularly distributed to its readers during all of said period. That the full amount of the fee charged for the foregoing publication is the sum of $119.52 which amount has been paid in full, or billed at the legal rate according to RCW 65.16.090 Subscribed to and sworn before me this 18th day of December, 2006. Notary Public in and for the State of Washington, Residing at Federal Way • ootiiiiIu,i, 7,---1 , /4/A . ,4G '.j•(tdMENT A.F,9% :.4 NAV.ARy <1: '% ��; .,FPvAE�A: C? 1414 SO.324TH STREET,SUITE B210, FEDERAL WAY,WA 98003 • 253-925-5565 ■ FAX:253-925-5750 Dole*d pes of ApWeir>e': December Date Determined Complete: November 211, 2006 Comment Due Date:December 27,2006 Pert**Required by This Application:Use am( Ill Approval (File #06-105692-UP), Determination of Nonsignificance is- sund by Lakehaven Utility District on October 11,2006). r Permits Known at This Time and not imploded In This Application: Building Per- mits Illevant Environmental Documents are A ONoble at the Address Below:X Yes No Doirolopment Regulations and City Plans f6 re Used for Project Review and Con- y Known at This Time: Federal Way Oily Code(FWCC)Chapter 18, 'Environmental Protection"; FWCC Chapter 19, 'Planning and Development"; FWCC Chapter 21, Surface and Stormwater Man- agement"; and FWCC Chapter 22, "Zoning." The project will be reviewed for consistency with all applicable codes and regulations in- cluding the FWCC;King County Surface Wa- ter Design Manual; and the International Building,Fire,and Mechanical Codes. ommagerilliMINMIL WON The official project file is available for public ONO A}Mk1CATlON review at the Department of Community De- 1irsA IMO fill velopment Services (33325 8th Avenue Pr*ct Deecrl riled; The,proposal is to in- South, PO Box 9718, Federal Way, WA stag a filtration system that intrudes 90 98063-9718).Any person may submit written squeaffeet into an existing wetland buffer at comments on the land use application or the 16 1st Avenue South. The filtration environmental impacts of the proposal to the removes iron and manganese from Director of Community Development Servic- strict's drinking water supply source es by 5:00 p.m. on December 27, 2006. Imam as Well 21. The filters and sedimen- Only persons who submit written comments WOO tank will encompass an area of ap- to the Director, or specifically request a copy p eie+stely 350 square feet on the 81,589 of the decision, may appeal the Process Ill Siwfoot property placed south of the ex- decision. Details of appeal procedures for well house on an existing asphalt-con- the requested land use decision will be in- paved area.The approximate 70 feet ofi eluded 1fwi the written decision. pipe, as well as ancillary conduits, below ground.There will be a modified Oats of Nes6mn:12136 illion pond that will be utilized to contain the Itackwash water for groundwater infiltra- ttew. The new facility will be constructed In- 1N an existing secured fenced area on the ;artyowned by the District. Ion: 27403 Pacific Highway South, al n t: Lakehaven Utility District (Water),,ay Andy Wilt Box 4249;Federal Way,WA 98003 Stets Contact: Laura Kim, Associate Plan- 253-835-2641 DMI Application Receive* November 6, 2006 CITY OF FEDERAL WAY DEPARTMENT OF COMMUNITY DEVELOPMENT SERVICES V OPMENT REVIEW COMMITTEE TRANSMITTAL DATE: Vif November 13 , 2006 0 TO Will Appleton, Development Services Manager Verffi 1aD Scott Sproul, Assistant Building Official I Brian Asbury, Lakehaven Utility District Chris Ingham, Federal Way Fire Department FROM: Laura Kim FOR DRC MTG. ON: November 22, 2006 - Completeness Review FILE NUMBER(s) : 06-105692-UP Process III RELATED FILE NOS. : .Ferrer- Q 2 I OW 4-Z- Pc d 2 _ 102 01-e{-_ u t� PROJECT NAME: Lakehavin Well #21 b PROJECT ADDRESS: 35316 1st Avenue South ZONING DISTRICT: RS 35 . 0 PROJECT DESCRIPTION: Installation of filters to remove iron and manganese from the drinking water supply. LAND USE PERMITS: Use Process III, SEPA PROJECT CONTACT: Andy Wilt 3203 SW Dash Point Road Federal Way, WA 98023 253-945-1592 MATERIALS SUBMITTED: Master Land Use Application Lakehaven Utility Memorandum Vicinity Map King County Assessors Map Report on Parcels DNS by Lakehaven Utility District Environmental Checklist Key Map of Photographs Photographs 1-6 Lakehaven Utility District Project Report for Iron and Manganese Removal for Well 21 :GENE® MASTER LAND USE APPLICATION (J• U 'ZOO6 DEPARTMENT OF COMMUNITY DEVELOPMENT SERVICES CITY OF 33325 8th Avenue South • CITY OF FEDERAL WAY PO Box 9718 Federal BUILDING DEPT. Federal Way WA 98063-9718 253-835-2607;Fax 253-835-2609 www.c i tyo ffede ral way._c o rn 06- /a S"-"b 9 z — ca-f° 33E /t- b - tv APPLICATION NO(S) Date Project Name NEz1- / F/GTR4T/off Property Address/Location 3r3/C / sr- t-1 -- 50 I.y t Parcel Number(s) a 7 10 / 903 Project Description /A- T792-4-i47za-4> c' Fi L e At fito /v /911D A4f--/t/ vg-s Miff 7 f 1124I' 't &= ti/i¢7 ' #94 y PLEASE PRINT Type of Permit Required Applicant Annexation Binding Site Plan oY Id/ 7 Name: Boundary Line Adjustment v p�y5/� pa"Nr �Q d� Comp Plan/Rezone Address: ''� 3 I` A Land Surface Modification City/State: %'EDt�- A.JAYj w Lot Line Elimination Zip: `t?G a 3. 7 3q.O Phone: Preapplication Conference s3-��/S/ �/� Process I(Director=s Approval) Fax: i7 3_ V--7y,_ ard-7 Process II(Site Plan Review) Email: A4014 r �4-442-.1 / .oAG Process III(Project Approval) Signature: Process IV(Hearing Examiner's Decision) Process V(Quasi-Judicial Rezone) Agent(if different than Applicant) Process VI SEPA w/Project Name: SEPA Only Address: Shoreline: Variance/Conditional Use City/State: Short Subdivision Zip: Subdivision Phone: Variance: Commercial/Residential Fax: Email: Signature: Required Information A 5 3 Zoning Designation Owner /�T Lc Ty- DJ5,r7e C Name: Comprehensive Plan Designation ?d 1 X 1121/7 Address: Value of Existing Improvements City/State: FEWAz- W/ Y� 4/4 Ain Value `1,4)A- £{'(f9 Value of Proposed Improvements Phone: 0 -3_ 91/1_/57 C International Building Code([BC): Fax: P73- 737-93/6 d l Email: /" Occupancy Type Signature: Construction Type Bulletin#003--August 18.2004 Page 1 of 1 k:\Handouts\Master Land Use Application • DEPARTMENT OF COMMUNITY DEVELOPMENT SERVICES 33325 8th Avenue South PO Box 9718 CITY OF Federal Way WA 98063-9718 FeeraI \! 1ay 253-835-7000; Fax 253-835-2609 www.cityoffederalway.com DECLARATION OF DISTRIBUTION 1, ) - ' \ hereby declare, under penalty perjury of u of the laws of the State of Washington, that a: fit Notice of Land Use Application/Action 0 Land Use Decision Letter ❑ Notice of Determination of Significance 0 Notice of Public Hearing before the (DS) and Scoping Notice Hearing Examiner ❑ Notice of Environmental Determination 0 Notice of Planning Commission Public of Nonsignificance (SEPA, DNS) Hearing ❑ Notice of Mitigated Environmental 0 Notice of LUTC/CC Public Hearing Determination of Nonsignificance (SEPA, MDNS) 0 Notice of Application for Shoreline Management Permit ❑ Notice of Land Use Application & Anticipated DNS/MDNS 0 Shoreline Management Permit ❑ FWCC Interpretation 0 Adoption of Existing Environmental Document ❑ Other was )gmailed 0 faxed 0 e-mailed and/or 0 posted to or at each of the attached addresses on — --- e c_ 1 a , 2006. J-- Project Name Lzk„l, ,, ^ *a File Number(s) ©(o -fib 5.6 9.) - P Signature Date 1)— )) -a Do 6 K:\CD Administration Files\Declaration of Distribution.doc/Last printed 1/23/2006 8:42 AM 41111111411i CITY OF llr�r+" Federal Way NOTICE OF LAND USE APPLICATION Lakehaven Well #21 • Project Description: The proposal is to install a filtration system that intrudes 90 square feet into an existing wetland buffer at 35316 ls`Avenue South.The filtration system removes iron and manganese from the District's drinking water supply source known as Well 21. The filters and sedimentation tank will encompass an area of approximately 350 square feet on the 81,589 square-foot property placed south of the existing well house on an existing asphalt-concrete paved area. The approximate 70 feet of 12-inch pipe, as well as ancillary conduits, will be below ground. There will be a modified infiltration pond that will be utilized to contain the backwash water for groundwater infiltration.The new facility will be constructed inside an existing secured fenced area on the property owned by the District. • Location: 27403 Pacific Highway South,Federal Way Applicant: Lakehaven Utility District(Water), Attn: Andy Wilt PO Box 4249; Federal Way,WA 98003 Staff Contact: Laura Kim,Associate Planner, 253-835-2641 Date Application Received: November 6, 2006 Date of Notice of Application: December 13, 2006 Date Determined Complete:November 28, 2006 Comment Due Date: December 27, 2006 Permits Required by This Application: Use Process III Approval (File#06-105692-UP), SEPA (Determination of Nonsignificance issued by Lakehaven Utility District on October 11, 2006). Other Permits Known at This Time and not Included in This Application: Building Permits Relevant Environmental Documents are Available at the Address Below: X Yes No Development Regulations and City Plans to be Used for Project Review and Consistency Known at This Time: Federal Way City Code(FWCC)Chapter 18, "Environmental Protection"; FWCC Chapter 19, "Planning and Development"; FWCC Chapter 21, "Surface and Stormwater Management";and FWCC Chapter 22, "Zoning."The project will be reviewed for consistency with all applicable codes and regulations including the FWCC;King County Surface Water Design Manual; and the International Building, Fire, and Mechanical Codes. The official project file is available for public review at the Department of Community Development Services(33325 8th Avenue South, PO Box 9718,Federal Way,WA 98063-9718). Any person may submit written comments on the land use application or the environmental impacts of the proposal to the Director of Community Development Services by 5:00 p.m. on December 27, 2006. Only persons who submit written comments to the Director, or specifically request a copy of the decision,may appeal the Process III decision. Details of appeal procedures for the requested land use decision will be included with the written decision. Published in the Federal Way Mirror on December 13,2006. 06-105692 Doc.1.D.39067 IM IF IN ■ • vicinity Map LIJ 348 ST sv� - ro e s o 6W35aST I Proposed Site I SW 353 1/V1 31dT1 1 sT SW Q jY � S 356 ST / ( I �J 3 /- fOiNsui • N •W E 5 Co) co C M CO co coo O O 0 GC) •• O CO CO O O O 0 0 •• r•' O O 0 0000 CO CO .• CO CO CO CO O a) O a) • O a) a) a) Qa2 < Q < « < as a)< a) cau • aai as as a) c`a ai (! • C 1 c! ! G aa) a a) ate) ate) Cl) ate) a) a) U LLU) U LL 0LLLLLL L L L L .r u) U)• U) a) U) U) W a) a) a) a) Ct 7 7CI CD 02) Q Q Q a Q co •, M co co Q Q a) ti 00 I� ti Q yrn rnwa) 7; U) + Z � p p 0 0 0 •J — Ot- Nco co � 2COC. - ccid I, d d d c,) E L 0 a) T U C a) Z ojf (6 1I a) Tv— (B C c6 C ca a) a) a) a) a) a) O a) C) a) am = , LL LL LL .z � � ° 0 C)000D O Y m U > O O 2 U- U- U) U) U) U) V) U) Z F- W W • ' 7 2 U) rr T- I• CE U M CO 't 0 0 CO 0 •. 0) 0 0 Ur) z '- O N a) LLI N ? co co coM tr.) O N N 0 a) U .7:: 0) 0) 0 •+ 0) 0)Q0 0) 0) • a) CZO •• -0 V d• d- O O O O O •+ O O O O r r r c- c- d —o N N N N N N N N N Q) 7 — a) a) a) a) 0) • 0C) 0) 0 Q U a N N N N N M N N M • OutputPir County Page 1 of 2 0 , King Well 21 Filtration - 300' mailing labels :. '-, '4#X s • oa9r7 2021 i8 � 21049os4 Paz#f' ,!ep_. .1ue ins# Y5. a)21d51146 A f12i r?49p24 J i -.1.,1r; - 2921049029 2A294 i T4fSOD d7, #dd9J17 2921e?R9A8# •79tITdOdd`tad i 2#47trArJ� v w 2921 2921O490 0 > r 7U0�''' 6 ` 2921O4907l r 94490713 1�1 1O4 .n031U490 ? , j 9A21 +f t8 d49�. 92#049t1 t5 f t b 115 5r' " Lemend DUP Selected Parcels A �,•to. .�- ,am DU pa to worn ® rie.CPwnintrity aursrss se The Buffer gi A,36•Agriedtursk,Pk+DU PP,35avea Mil RE. i_ County Boundary 8,Fore 0.Mos x Mountain Peaks ,ram t.tv , Streets FUV25•Rut**Acvsl.a OU per Ponta 5 aoa ■ Ohtr RAa5,Roan Aced,am 1O pa 5 eionat 0 Incorporated Area "of ir*Frotry j R A,10,Ernst Area,toot OU per tU aad* ti tua r UR.Udem Fteaea ra,ant DU Par 5 sate, Forest Production t�BOundaty R.1'Rom,one Oil 1 Pure !/ Agricultural Production District Boundary R-4, 4IX Pet Pare ise Urban tarns Area Line R e.ac a s.acw pia ,. DU par tat i• Lakes and Large Wets e" ntat$ I•f Streams3 FE.12,F1�,12nf1 ptrre R•18 RS641114 18 DU per Wry r'` Tribal Lands11 R.24.Rttidtrikat2t DU Par aole EDParcels ® R48,Resalarr8P1,48OU we text Zoning ;r? NB.N MKd Rusenotas +it, The information included on this map has been compiled by King County staff from a variety of sources and is subject to change without notice.King County makes no representations or warranties,express or implied,as to accuracy,completeness,timeliness,or rights to the use of such information.King County shall not be liable for any general,special,indirect,incidental,or consequential damages including,but not limited to,lost revenues or lost profits resulting from the use or misuse of the information contained on this map.Any sale of this map or information on this map is prohibited except by written permission of King County. LAKEHAYEN UTILITY DISTRICT MEMORANDUM RECEIVED NOV 0 6 2006 DATE: September 22,2006 CITY OF FEDERAL WAY BUILDING DEPT. TO: City of Federal Way—Planning Division FROM: Andrew Wilt7) SUBJECT: Well 21 Filtration Proposed Facility within Wetland Buffers Background: The District's existing Well 21 facility is located on an approximately 201-foot by 405-foot rectangular property at 35316 1st Avenue South in Federal Way. The existing well house is located approximately in the center of the property in the north-south direction and approximately 300 feet east of the westerly property line. The placement of the facilities near the center of the property, but away from the street was done to maximize the District's sanitary control area around the well. The Department of Health typically requires a 100-foot radius around wells for sanitary protection. The water quality of the well currently meets all Department of Health primary and secondary water quality standards with the exception of iron and manganese. Secondary inorganic water quality limits typically relate to the aesthetic quality of the water, while primary contamination limits relate to health standards. In order to bring the water quality of this well into compliance with the secondary standards for iron and manganese, the District needs to construct filtration facilities on the site to reduce the natural mineral level of these constituents before delivery to the distribution system. The District reviewed several treatment options that were available and selected the current system for its effectiveness and simplicity, which also results in the smallest practical footprint and the least amount of disturbed area on the site. The northeast corner of the parcel contains a small stream and associated wetland. The northeastern 1/3 of the parcel (which includes the existing well house, most of the existing paved parking area, and a portion of the existing detention pond) lies within the 200 foot wetland buffer. The eastern half of the property is developed. A fill pad occupies most of this half, descending to pre-existing grades to the north and east. An asphalt driveway provides access from 1st Avenue South(southwest corner of the property) for large cranes, drilling equipment and service trucks. The outer perimeter of the site includes a 6-foot security screening fence. The Page 1 of 2 fence generally lies on the property line with the exception of the westerly fence line which is set back approximately 200 feet from the westerly property line. The property within the fence is mowed lawn with clusters of evergreen trees surrounded by native shrubs. Proposed Location (See Exhibit A): The proposed filtration system includes the above ground placement of two banks (4 tanks each) of pressure filters and a below ground 10' x 18' sedimentation tank. In addition,the project needs access to the water main that runs easterly from lst Avenue South along the driveway to the parking area where it turns north to the existing well house. The proposed location of the filters is on the southeast corner of the existing paved parking area approximately half of which is inside the wetland buffer. The sedimentation tank will be located in the existing paved parking area parallel to the filters, but further west outside of the wetland buffer. By placing the filters and the sedimentation tank in the existing paved area no increase in impervious surfaces will result. As this well will be routinely used for water supply, sufficient area around the wellhead must be maintained for emergency and routine maintenance. Ideally, well maintenance activities need a minimum 40-foot radius to one side of the well and a 10-foot radius to the opposite side of the well for crane and drilling equipment access. This access standard can be met from either the west or east of the wellheads under the proposed layout. The existing infiltration pond is located to the northwest of the proposed sedimentation tank. Since the water infiltrated through the pond is suitable for discharge,the pond could be considered a complementary retention component of the wetland buffer area. Another District consideration in selecting the proposed location was for security against vandalism or vehicular accidents by having the filters the greatest distant from the west access road. Approximately 3 of the 8 proposed filter tanks will be located within the wetland buffer area with the remaining five tanks being located outside of the buffer. The sedimentation tank will be located outside of the buffer. It is not feasible to completely avoid the buffered area with the needed additional infrastructure and still maintain adequate access (including maintaining an adequate truck turning radius) and protection to all the well facilities. Placing the equipment in the existing paved area will create the least disturbance to an otherwise naturally vegetated, upland site. The proposed locations appear to provide the least amount of impact to the existing site conditions, preserves wetland buffer area to the greatest extent possible, and minimizes impervious surface impacts. Page 2 of 2 DETERMINATION OF NONSIGNIFICANCE Description of proposal: The "Well 21 Filtration" project is a drinking water system improvement to remove iron and manganese from an existing potable drinking water well. The project will install approximately 70 feet of 12" ductile iron water mains and appurtenances (mostly underground); together with eight (8) - 48" diameter filter tanks and an 8 foot wide by 19 foot long underground sedimentation tank. All facilities will be constructed approximately 300' east of 1st Avenue South inside an existing secured fenced area on property owned by the District. Proponent: Lakehaven Utility District Location of proposal, including street address, if any: The facilities will be located within a fenced area on the District's property situated at 35316 1st Avenue South, Federal Way, WA. Lead agency: Lakehaven Utility District The lead agency for this proposal has determined that it does not have a probable significant adverse impact on the environment. An environmental impact statement (EIS) is not required under RCW 43.21C.030(2)(c). This decision was made after review of a completed environmental checklist and other information on file with the lead agency. This information is available to the public on request. This DNS is issued under WAC 197-11-340 (2); the lead agency will not act on this proposal for 14 days from the date of this DNS. Comments must be submitted to the District by 5:00 p.m. on Friday, October 11, 2006. Unless modified by the District, this determination will become final following the above comment deadline. Any person aggrieved of the District's final determination may file an appeal, along with the appropriate filing fee,within 15 days of the above comment deadline. Responsible official: Donald T. Perry Position/title: General Manager Phone: (253) 941-1516 Address: Lakehaven Utility District P.O. Box 4249 Federal Way, WA 98063 Date Signature O O O (0 .. 0) O O O O O O O .. ' 0 0 0 00) 00) m co m • 0) 00) m m aiL. m ° T6TuTu -o °a -a CO -0 "0 °. � -o -a -0 li !iO) titi 011_) u li c t -C 0 0 ,_ o W W W 15 W 0 g3 a) a) 1_ a) tv ct c 2 c p > > G) > U) • O a0 ap > Q Q Q � Q <— •: M � � Q OrnCT/50) 0) 0) 0) 17; W x x x x v0 coo • 0001.0 .3a3 M (� O M d 1, 0002 d O Q M E L 0 c Z M 1\ C>>CD — 76 (6 (9 (II N a) a) a) O DM a)C m D -p - o coo Y a) Q) (1) W m L 0 Z (o V o 0 0) o o a) C >. (o Y �.L (:) ,I � YmU 5ob L LL 0 (0 ( 0 0 2 H W W ( y 2 cn r- Q O M a 0vo000fl0 •. 0) 000n of w � v mLOU, LO O ? M M M M M O 0 - = I— N J O Cp O O O M O n O 1` N O (f) N .- (() N p Q 0 00) mmm0) •� mm0) m L a) OOOOO •. 000O 0 7 Z m 0) 0) 00)) 0) • 0 0) 0) 0 Q U a N N N N N M N N M • Output Page 1 of 2 King County Well 21 Filtration - 300' mailing labels 1921049011 i 2 J'7"149Gi19 2021049054t t` •5 if 3021'40162 , �1 .ems 3 '. �rSa* . ,47 3L-t 1041 5 urt" a fit- ti a ."s£ . "� 'e ,� i __ .. „,,, ,-s, ^, `,,�.„1491 2921049013 ' ��'' ff e312/049146 i a$ I `t 91#i 9<1g9" a., 2931U491 6 g -•Z r� 4F7 .,� v :4 %"s >s, .,, 2 � � £ ice .a• _'t:)i'1� 9£i34 sz?�ds '�': '`' ''"c'3a# { 7 r�.%,. e'K s.,.....a.,....m.... a � � ° ' '4 � 2921(149029 S [ r 9Z t t149tk�5 } it 1 292104g06 I h t 7 tOtWO 0 # 3Lt11tNt5Kt!"t �\ i " n 29210490451 ,,N. s 2921U494 i „____ 2921045CM I i 292Itmtlot3 -x 13s7o00099 Q 2921 t49016 i i Z i . ._ YV.3cr TH ST' j _ x lt123� 3 7Ft 57 ic)2005KIR2CaRMy �21 9°2t0 302rnigltf� 2afi4� 29210490a5{ 114 n. o i. 1 1 9511 iiid tio2 _.,-t;, - �.y�� Legend Selected Parcels 7. x A-1+7 NrcLeerar,aye EX1 xz^,a awes CAS-Commrary B,.mnero. The Buffer A-35• ",'.s1*.ra,onex'?s1 3-5 ace 13•R Req iS- Tn • — County Boundary Fates.: 0.€ r x Mountain Peaks to &Isere "" 1 Streets RA-2.5•fiLrat hra se j€1:ss 5 a?es tX c RA-5 Runts Area,ale CU ow 5 tee~ 4 Incorporated Area "le 3.trithvar .�aaQ',; six to,;kali kwcrr__ail iQ a:-- s ,, JR=i) i Koch-re ane a;.1 per 5 '-sats 1 Forest Production District Boundary R,1 reea r xxe f Agrsulturat Pfaductaon District Boundary Rs ' * ~vu a e / R G•Re.rdcs-r r 0:j ,,sac itoif Urban Growth Area Lure R..8-R-.wr],rsszf a^al X x aar Lakes and Large livers i R-12 Rc+ xa12pv-s-se :.,/ Stream n R,18-?2rdtr .,8 ti ir f ps e i Tribal Lands a .14— R-24 Rev3rx64 24 rai;acz.rae tr riParcels R•s<*3 rte n4 .V DU x;e Zoning "tie Nts ttcr-orf-J.rrzass (omit , >#I The information included on this map has been compiled by King County staff from a variety of sources and is subject to change without notice.King County makes no representations or warranties,express or implied,as to accuracy,completeness,timeliness,or rights to the use of such information.King County shall not be liable for any general,special,indirect,incidental,or consequential damages including,but not limited to,lost revenues or lost profits resulting from the use or misuse of the information contained on this map.Any sale of this map or information on this map is prohibited except by written permission of King County. r ENVIRONMENTAL CHECKLIS EovED NOV 0 6 ?.006 Purpose of Checklist: CITY OF FEDERAL WAY BUILDING DEPT. The State Environmental Policy Act (SEPA), Chapter 43.21C RCW, requires all governmental agencies to consider the environmental impacts of a proposal before making decisions. An environmental impact statement (EIS) must be prepared for all proposals with probable significant adverse impacts on the quality of the environment. The purpose of this checklist is to provide information to help you and the agency identify impacts from your proposal (and to reduce or avoid impacts from the proposal, if it can be done) and to help the agency decide whether an EIS is required. A. BACKGROUND 1. Name of proposed project,if applicable: Well 21 Water Fill-rat' 2. Name of applicant: Lakehaven Utility District 3. Address and phone number of applicant and contact person: Lakehaven Utility District Andrew Wilt P.O. Box 4249 (253) 945-1592 Federal Way,WA 98063 4. Date checklist prepared: 9/20/06 5. Agency requesting checklist: Lakehaven Utility District City of Federal Way Washington State Department of Health 6. Proposed timing or schedule (including phasing,if applicable): Construction to begin in Early 2007 with completion expected by late in December 2007. 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. No 8. List any environmental information you know about that has been prepared, or will be prepared,directly related to this proposal. W21-SEPA Checklist 091106 1 c � In January 2005, HDR Engineering, Inc. completed a Wetland Deliniation report describing the stream and wetland in the vicinity of the Well 21 site. The report also describes the wetland and stream buffer boundaries that fall within the site boundaries. Portions of the water filtration facilities will fall within the buffers. The portions of facilities within the buffer include the water filter assembly and associated piping. The Lakehaven Utility District has also sampled discharges from an existing filtration system at another well site to obtain filter backwash water quality data. The data will provide information on the chlorine residual and manganese/iron concentrations of the backwash water that will be delivered to the infiltration pond. 9. Do you know whether applications are pending for governmental approvals of other proposals directly affecting the property covered by your proposal? If yes,explain. There are no other projects proposed for this property at this time. 10. List any government approvals or permits that will be needed for your proposal, if known. City of Federal Way: Land Use Process III Permit Washington State Department of Health: Review and Approval of Project Plans 11. Give brief, complete description of your proposal,including the proposed uses and the size of the project and site. There are several questions later in this checklist that ask you to describe certain aspects of your proposal. You do not need to repeat those answers on this page. The filters to be installed will remove iron and manganese from the District's drinking water supply source known as Well 21. The removal of the iron and manganese will reduce customer calls relating to mineral deposits and staining. The filters and sedimentation tank will encompass an area of approximately 350 square feet on the 81,589 square foot property. The filters and sedimentation tank will be placed south of the existing well house in an existing asphalt-concrete paved area approximately 300' east of the public right-of-way. Except where pipe connections are made to the filtration system, the approximately 70 feet of 12" site piping, together with ancillary conduits, will be below ground. The sedimentation tank will be below ground. An existing stormwater infiltration pond with a holding capacity of about 300 cubic feet below the overflow outlet elevation of 199 will be modified to raise the outlet elevation to 202 to give a new holding capacity of approximately 2,700 cubic feet. This modified infiltration pond will be utilized to contain the backwash water for groundwater infiltration. The new facility will be constructed inside an existing secured fenced area on property owned by the District. 12. Location of the proposal. Give sufficient information for a person to understand the precise location of your proposed project,including a street address, if any, and section, township, and range, if known. If a proposal would occur over a range of area, provide the range or boundaries of the site(s). Provide a legal description, site plan, vicinity map, and topographic map, if reasonably available. While you should submit any W21-SEPA Checklist 091106 2 plans required by the agency,you are not required to duplicate maps or detailed plans submitted with any permit applications related to this checklist. The project site is located at 35316 1st Avenue South, approximately 1,000 feet north of South 356th Street in Federal Way. The legal description of the site is parcel 292104 9031, in the NW 1/4 of Section 29, Township 21 North, Range 4 East (Willamette Meridian), King County, Washington (see attached vicinity map). Proposed project site plans will be on file at Lakehaven Utility District's Water Operations Building located at 31623 1st Ave South, Federal Way, WA 98003. B. ENVIRONMENTAL ELEMENTS 1. EARTH a. General description of the site (circle one): Flat, ollin hilly, steep slopes, mountainous, other. The site is generally sloping. The property consists primarily of knolls of evergreen and deciduous trees within a lawn that slopes down to the north-east. The entrance driveway is ramped down to grade from 1st Avenue South and leads to the well house located toward the rear of the property (east). The eastern half of the site has been developed with the well house, driveway with turnaround/parking area, and the infiltration pond. b. What is the steepest slope on the site (approximate percent slope)? The 200 foot by 405 foot site averages approximately 15% down slope from south-west to north-east. The slope is generally approximately 15% except for the developed area near the pump house and the driveway turnaround/parking area which is generally flat. The steepest slope on the site is approximately 25% down from the flat developed area toward the north and east. The filter facilities will be within the relatively flat portion of the existing paved driveway turnaround/parking area. c. What general types of soils are found on the site (for example, clay, sand, gravel, peat, mulch)? If you know the classification of agricultural soils, specify them and note any prime farmland. Generally the site has Everett gravelly sandy loam with clays. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. No. e. Describe the purpose, type, and approximate quantities of any filling or grading proposed. Indicate source of fill. The site grade will generally remain the same. Approximately 60 cubic yards of excess material will be removed for the installation of the sedimentation vault and associated water piping to and from the filters. W21-SEPA Checklist 091106 3 f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. No additional water is proposed to flow overland that could cause erosion during project use. The project is designed to keep process water contained within an infiltration pond. A silt fence (or similar erosion control methods) will protect the off-site migration of sediments during clearing and excavation work until the project is completed. Disturbed soils will be re-vegetated prior to removal of the silt fencing. Spoils from the excavation for the sedimentation vault will be removed from the site at the time of the excavation. Only the temporary stock piling of spoils from pipe trenches and bedding material is anticipated. Wash water for truck tire cleaning will be available and street sweepers will be used if needed to prevent dirt trailing from the site. g. About what percent of the site will be covered with impervious surfaces after project construction (for example,asphalt or buildings)? Well 21's 81,589 square foot site has approximately 6,800 square feet of existing impervious surface which includes the well house, driveway and miscellaneous concrete pads. This represents approximately 8% of the existing property. The new facilities will not add additional impervious surfaces. h. Proposed measures to reduce or control erosion,or other impacts to the earth,if any. Silt fences, catch basin filter fabric and/or other materials will be installed to prevent erosion from impacting areas offsite during construction. The existing infiltration pond reduces the overall surface runoff from the site by infiltrating into the ground the water that falls on the existing impervious surfaces and the water that would normally fall in the pond area. There will be no increase in impervious surface area from this project. 2. AIR a. What types of emissions to the air would result from the proposal (i.e., dust, automobile, odors, industrial wood smoke) during construction and when the project is completed? If any,generally describe and give approximate quantities if known. In the short term, there will be some diesel engine emissions from the operation of the crane and backhoe during excavation and installation of the sedimentation tank and piping, and from truck emissions from delivery of materials, etc. There also may be dust that will be controlled by wetting the soil surface with water if needed. In the long term, there will be no additional emissions as a result of this project. b. Are there any off-site sources of emissions or odor that may affect your proposal? If so, generally describe. No c. Proposed measures to reduce or control emissions or other impacts to air, if any. If needed, water will be used to control dust during excavation work. The use of heavy diesel equipment will be limited to daylight hours. W21-SEPA Checklist 091106 4 3. WATER a. Surface. 1) Is there any surface water body on or in the immediate vicinity of the site (including year-round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and provide names. If appropriate,state what stream or river it flows into. Yes. A tributary of the west branch of Hylebos Creek flowing northwest to southeast crosses the northeast corner of the property at about 25 feet southwest of the northeast corner. 2) Will the project require any work over, in, or adjacent to (within 200 feet) the described waters? If yes,please describe and attach available plans. The majority of the existing well house and associated driveways, parking areas, and mowed lawn of the Well 21 site are within 200 feet of a stream that is tributary to the west branch of Hylebos Creek. The placement of the filters will be on the existing paved parking area partially within the 200 feet buffer. The sedimentation tank will be placed in the existing paved parking area but will be outside the 200 foot wetland and stream buffer. The filters will have an area of approximately 180 square feet (18 ft x 10 ft), but will only encroach on the wetland buffer by about 90 square feet. 3) Estimate the amount of fill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected. Indicate the source of fill material. None. 4) Will the proposal require surface water withdrawals or diversions? Give general description,purpose, and approximate quantities if known. No. 5) Does the proposal lie within a 100-year floodplain? If so,note location on the site plan. No. The proposed elevation for the base of the filter tanks is about one-half foot above the finished floor of the existing well house. The District has not experienced any flooding problems at the site during 100-year storm events. 6) Does the proposal involve any discharges of waste materials to surface waters? If so, describe the type of waste and anticipated volume of discharge. No waste material will be discharged to surface waters. Precipitation that falls on the tank pad (existing driveway) will continue to discharge to the existing on-site infiltration pond. The filters have no other direct discharge to surface waters. Drinking water used to wash the filter beds of accumulated iron and manganese will travel through a sedimentation tank that will reduce the concentration of solid particulates in the wash water. The water passing from the sedimentation tank will be suitable for delivery to the on-site infiltration pond. W21-SEPA Checklist 091106 5 b. Ground. 1) Will ground water be withdrawn, or will water be discharged to groundwater? Give general description,purpose, and approximate quantities if known. No groundwater will be withdrawn other than the quantities of water permitted under existing Water Rights held by the District. There will be some water discharged to the soils as intended via the infiltration pond. The water used to wash the filters originates from the drinking water system. This backwash water then passes through a sedimentation tank that settles out 80 to 95 percent of the iron and manganese particles. After passing through the sedimentation tanks, the water will typically be clear to slightly colored and have a water quality similar to the District's drinking water except for higher concentrations of iron and manganese, but still suitable for land application or irrigation of grasses and plants. The estimated daily quantities of water discharged to the infiltration pond from the sedimentation tank will be approximately 6,000 gallons per day during the well's operation. 2) Describe waste material that will be discharged into the ground from septic tanks or other sources, if any (for example: Domestic sewage; industrial, containing the following chemicals...; agricultural; etc.). Describe the general size of the system, the number of such systems, the number of houses to be served (if applicable), or the number of animals or humans the system(s) are expected to serve. There are no waste materials that will be discharged to the ground, other that the water described above. Iron and Manganese concentrations of the water to be infiltrated is expected to be less than 13 mg/l. Annually there will be approximately 0.2 cubic yards of iron and manganese sediment collected in the sedimentation tanks. The inert minerals will be disposed of at the District's Wastewater Treatment Plant or other suitable sites. c. Water runoff(including storm water). 1) Describe the source of runoff (including storm water) and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow into other waters? If so, describe. Existing runoff within the project site originates from precipitation that falls directly on the site. Flow from abutting roads are collected by storm sewers and do not contribute overland flow onto the property. Flow from neighboring properties contributes overland flow onto the property. Currently, storm water within the site area eventually flows to the northeasterly property corner toward a tributary to the west branch of Hybolos Creek. Runoff from the existing well house and parking area flows to the existing infiltration pond. During construction, any surface water runoff from the construction areas will be filtered through appropriate filtering mechanisms such as silt fences to remove sediments before being allowed to continued overland or off site. Once the construction is completed and the construction site is stabilized, the surface runoff will be restored to the pre-project conditions. The infiltration pond reduces the overall surface runoff from the site by detaining more water that may have flowed overland during storm events and infiltrating it into the ground. Backwash water from the filters will be directed to the pond at rates suitable for infiltration into the ground. W21-SEPA Checklist 091106 6 No significant change in water runoff is expected from the site. 2) Could waste materials enter ground or surface waters? If so,generally describe. From the filters, most of the iron and manganese will settle out in the sedimentation tanks that are part of the project. The collected iron and manganese will be taken to the Lakota Wastewater Treatment Plant or other suitable sites. The iron and manganese remaining in the water diverted to the infiltration pond will be retained in the pond by the soil and vegetation. d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any. During construction, silt fences, catch basin filters, and other recommendations of the City of Federal Way will be used to control any site water runoff. After construction, disturbed areas will be revegetated. 4. PLANTS a. Check or circle types of vegetation found on the site. X Deciduous tree: alder,maple,aspen,other X Evergreen tree: fir,cedar,pine, other X Shrubs X Grass Pasture Crop or grain X Wet soil plants: cattail,buttercup,bulrush, skunk cabbage, other Water plant: water lily,eelgrass,milfoil, other Other types of vegetation b. What kind and amount of vegetation will be removed or altered? No vegetation will be removed or altered to install the filters, supply piping, or sedimentation tank. Grass and blackberry bushes may be damaged to install the sedimentation tank discharge pipe in the location where the pipe exists the paved driveway and enters the bank of the infiltration pond. Grass will be reestablished on the pond perimeter. c. List threatened or endangered species known to be on or near the site. None. d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site,if any. None. 5. ANIMALS W21-SEPA Checklist 091106 7 a. Circle any birds and animals which have been observed on or near the site or are known to be on or near the site. Birds: hawk,heron, eagle, on:bird•. . Mammals: deer,bear,elk,beaver,other: Fish:bass,salmon,trout,herring,shellfish,other: b. List any threatened or endangered species known to be on or near the site. None to our knowledge. c. Is the site part of a migration route? If so, explain. No. Although the area is located near the Pacific Flyway, the project site is not known to be a critical part of the migration route. d. Proposed measures to preserve or enhance wildlife,if any. None. 6. ENERGY AND NATURAL RESOURCES a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the completed project's energy needs? Describe whether it will be used for heating, manufacturing, etc. Additional electricity will be needed to overcome the slight increase in backpressure as water moves through the iron and manganese removing filters. b. Would your project affect the potential use of solar energy by adjacent properties? If so,generally describe. No. c. What kinds of energy conservation features are included in the plans of this proposal? List other proposed measures to reduce or control energy impacts,if any. Not installing a building around the filters will save both heating and lighting energy. 7. ENVIRONMENTAL HEALTH a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste, that could occur as a result of this proposal? If so, describe. No. 1) Describe special emergency services that might be required. None. W21-SEPA Checklist 091106 8 2) Proposed measures to reduce or control environmental health hazards,if any. None. b. Noise. 1) What types of noise exist in the area which may affect your project (for example:traffic, equipment operation,other)? None. 2) What types and levels of noise would be created by or associated with the project on a short-term or long-term basis (for example: traffic, construction operation, other)? Indicate what hours noise would come from the site. No long term noise impacts. Short term construction noise will be created from backhoes and truck activity. 3) Proposed measures to reduce or control noise impacts,if any. Construction work will be limited to normal daylight work hours. 8. LAND AND SHORELINE USE a. What is the current use of the site and adjacent properties? The Well 21 site is currently listed as Single-Family Residential, however the site maintains a well house and one well for water production. A stream and small wetlands exists on northeast corner of the property. The properties to the north and east are undeveloped and owned by the City of Federal Way. The property to the south is a single family residence. The commercial property to the west on the opposite side of 1st Avenue South is the Village Green Retirement Campus. b. Has the site been used for agriculture? If so, describe. No. c. Describe any structures on the site. Currently the site contains a well house that is approximately 20 foot by 24 foot and is maintained by the Lakehaven Utility District for municipal water supply purposes. d. Will any structures be demolished? If so,what? No. e. What is the current zoning classification of the site? Single Family Residential, RS 35.0 (1 unit per 35,000 square feet) f. What is the current comprehensive plan designation of the site? Single Family Residential -Medium Density g. If applicable,what is the current shoreline master program designation of the site? Not applicable. W21-SEPA Checklist 091106 9 h. Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. Approximately 200 feet of the northeasterly most portion of the site is within a stream/wetland buffer area. i. Approximately how many people would reside or work in the completed project? None j. Approximately how many people would the completed project displace? None k. Proposed measures to avoid or reduce displacement impacts,if any. Not applicable. 1. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans,if any. Pursuant to Federal Way City Code Section 22-644, public utilities are an allowed use in this zone. 9. HOUSING a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low-income housing. Not applicable. b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low-income housing. Not applicable. c. Proposed measures to reduce or control housing impacts,if any. Not applicable. 10. AESTHETICS a. What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building material(s) proposed? The heights of the filters and generator are less than 10 feet. The filter tanks are painted steel, and the buried sedimentation tanks and the foundation for the filters will be concrete. b. What views in the immediate vicinity would be altered or obstructed? None. W21-SEPA Checklist 091106 10 c. Proposed measures to reduce or control aesthetic impacts,if any. None. 11. LIGHT AND GLARE a. What type of light or glare will the proposal produce? What time of day would it mainly occur? None. b. Could light or glare from the finished project be a safety hazard or interfere with views? No. c. What existing off-site sources of light or glare may affect your proposal? None. d. Proposed measures to reduce or control light and glare impacts,if any. Not applicable. 12. RECREATION a. What designated and informal recreational opportunities are in the immediate vicinity? None known. b. Would the proposed displace any existing recreational uses? If so, describe. No c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant,if any. Not applicable. 13. HISTORIC AND CULTURAL PRESERVATION a. Are there any places or objects listed on, or proposed for, nation, state, or local preservation registers known to be on or next to the site? If so,generally describe. None known b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or cultural importance known to be on or next to the site. None are known to be on or adjacent to the project site. c. Proposed measures to reduce or control impacts,if any. Not applicable at this time. W21-SEPA Checklist 091106 11 14. TRANSPORTATION a. Identify public streets and highways serving the site, and describe proposed access to the existing street system. Show on site plans,if any. The property is located on the east side of 1st Avenue South, approximately 1000 feet north of South 356th Street. The access drive is off of 1st Avenue South. The current access will not change. b. Is the site currently served by public transit? If not,what is the approximate distance to the nearest transit stop? Not applicable. c. How many parking spaces would the completed project have? How many would the project eliminate? The project will not create or delete parking spaces. d. Will the proposal require any new roads or streets, or improvements to existing roads or streets, not including driveways? If so, generally describe (indicate whether public or private). No e. Will the project use (or occur in the immediate vicinity of) water, rail, or air transportation? If so,generally describe. No f. How many vehicular trips per day would be generated by the completed project? If known, indicate when peak volumes would occur. None g. Proposed measures to reduce or control transportation impacts, if any. Not applicable. 15. PUBLIC SERVICES a. Would the project result in an increased need for public services (for example: fire protection,police protection,health care, schools,other)? If so, generally describe. No. b. Proposed measures to reduce or control direct impacts on public services,if any. Not applicable. 16. UTILITIES W21-SEPA Checklist 091106 12 a. Circle utilities currently available at the sites e ectrici natural gas, rate refuse service elephon , sanitary sewer,septic syste o er. b. Describe the utilities that are proposed for the project, the utility providing the service, and the general construction activities on the site or in the immediate vicinity which might be needed. No new utility services will be required for the project. C. SIGNATURE The above answers are true and complete to the best of my knowledge. I understand that the lead agency is relying on them to make its decision. SIGNATURE: DATE SUBMITTED: W21-SEPA Checklist 091106 13 t - f RECEIVED NOV Q 6 2006 CITY OF FEDERAL WAY BUILDING DEPT. Lakehaven Utility District Project Report for Iron and Manganese Removal for Well 21 Lakehaven Utility District 31623 1st Ave S. Federal Way, WA 98003 Submitted: Project Report: - . , Iron and M dnese Removal for Well 21 Table of Contents: Page Number 1 Project Description Summary 1 2 Source Development 2 2.1 Introduction and Background 2 2.2 Source Project Alternatives 3 2.2.1 Source Alternatives 3 2.2.2 Well Facility Sizing Alternatives 3 2.3 Regulations 3 2.4 Bases of Design for Source Development 4 2.4.1 Pump Sizing 4 2.4.2 Piping and Meters 4 2.4.3 Well Enclosure 4 2.4.4 Electrical 4 2.4.5 Method of Operation 5 2.5 Source Water Quality 5 2.6 Source Protection 5 3 Treatment Design 6 3.1 Introduction and Background 6 3.1.1 Treatment Alternatives 7 3.1.2 Well 21 Water Quality 8 3.2 Treatment Description 8 3.3 Basis of Design for Treatment Facilities 9 3.3.1 Media 9 3.3.2 Filtration tanks 9 3.3.3 Finish Water Quality 10 3.3.4 Coatings 10 3.3.5 Backwash System 10 3.3.6 Backwash Disposal System 11 3.3.6.1 Backwash Water Quality 12 3.3.6.2 Sediment Tank 12 3.3.7 Chlorination 12 3.3.8 Sequestering 13 3.3.9 Security 13 3.4 Construction/Testing/Disinfection 13 3.5 Operations and Maintenance 13 4 List of References 14 Page ii - Project Report: Iron and M__,anese Removal for Well 21 List of Appendixes: Appendix A: Vicinity Map Appendix B: Estimated Water Cost from Tacoma Appendix C: Project Cost Estimates for Facility Sizing Appendix D: Water Right Appendix E: Well Report "Test/Production Well Drilling at King County Water District 124 Kemper Site, May 1981", by Robinson, Noble & Carr, Inc. Appendix F: Drain Pipe Sizing, Calculation Appendix G: Historic Water Quality Data Appendix H: Wellhead Protection Area Delineation Map Appendix I: Excerpts from Pre-Design Report: "Iron and Manganese Filtration at Wells 10A, 10C, 17, 17A, 17B, 18, 20A, 21, &23A", by Odell Engineering, June 2002 Appendix J: ATEC Iron and Manganese Removal System, Technical Specifications Appendix K: Filter Design Worksheet, Calculations Appendix L: Estimated Backwash Water Quality, Calculations Appendix M: Settling Velocities, Calculations Appendix N: Infiltration Pond Sizing, Calculation Appendix 0: Design Drawings (small), See Full Scale Drawings Appendix P: Operations and Maintenance Manual Page iii _ , 1 Project Description Summary Lakehaven Utility District's Well 21 site is located at 35316 1st Avenue South in Federal Way, Washington within the District's water service area boundaries (see Appendix A). The current use of this local groundwater source is for municipal supply, however the use of this well has been operationally curtailed primarily due to the high manganese content in the groundwater. An iron and manganese removal system for Well 21 is needed to improve water quality for Lakehaven Utility District customers. The District currently utilizes routine main cleaning and flushing efforts to control the sedimentation of these minerals in the distribution system. The objectives of this project are to reliably reduce the iron and manganese concentration from the groundwater and minimize the sedimentation of these minerals in the water distribution system near this site. This project includes installing an iron and manganese filtration system for Well 21, associated piping, a filter backwash settling tank and an infiltration pond. The filtration system will be capable of treating a capacity of 1000 gpm of water to below the state Maximum Contaminate Level (MCL) for iron and manganese. The cost of the project is estimated at $505,000 and would be funded from rates as part of the District's capital improvement program. , - Project Report: Iron and M Vanese Removal for Well 21 2 Source Development Groundwater is still Lakehaven's highest quality and least cost water supply option. The lack of high quality water production from the Well 21 site operationally deters the District's groundwater production capabilities in the Redondo-Milton Channel aquifer system, which makes up over 50% of the District's reliable annual water production capabilities. This project will assist in maintaining the District's use of these local resources. 2.1 Introduction and Background Lakehaven Utility District's Well 21 site is located at 35316 1st Avenue South in Federal Way, Washington and within the District's water service area (see Appendix A). Well 21 was drilled and developed in 1981. Well 21 was completed to a depth of 146.75 feet within the southern region of Redondo-Milton Channel (RMC) aquifer system. Initial pump testing was performed at 1000 gpm and DOE issued a Water Right Certificate (G1- 23853C) with an instantaneous limit of 1000 gpm and an annual quantity limit of 1300 acre-feet per year. The raw water quality of the well met all primary drinking water standards and secondary standards except for manganese. Currently Well 21 produces at a rate of 980 gpm consistent with its water right capacity. In terms of comprehensive supply, the District's instantaneous peak water production capability is less of an issue than its need for annual quantities of high quality water. As shown in the District's comprehensive water system plan (Ref. 1, page 1-10), the District has 21,000 gpm peaking capacity from its existing wells, or a 31 mgd capacity. This is also independent of an additional 3 mgd capacity available from the city of Tacoma through the District's NE Tacoma/Federal Way Transmission main project. Lakehaven's historic peak day production was 24.6 mgd in 1994. Current instantaneous peaking capacity still exceeds the District's highest peak day demand projection (with conservation) of 29.5 mgd in 2017 (Ref. 1, Table 4-3). As recommended in the District's comprehensive water system plan (Ref. 1, page 7-33), the district is to continue to balance the objective of maintaining groundwater levels and providing a low cost water supply. Maximizing the annual use of groundwater production is key to this objective. The District's overall average groundwater supply is estimated at 10.1 million gallons per day (Ref. 1, page 7-33), of which 5.8 mgd is derived from the RMC. Well 21 was not used in 2004 because of its poor water quality. In order to meet the objective of maximizing these wells and reducing mineral deposition in the Page 2 Project Report: , _ , Iron and M, Inese Removal for Well 21 distribution system, the District needs to remove the water quality impediment (manganese), or purchased an alternative water supply. 2.2 Source Project Alternatives The Introduction and Background section describes the relationship of Well 21 site to Lakehaven's source of supply resources. Without filtering the water from Well 21 the District would either continue to tolerate mineral sedimentation and water quality disturbances, or the District would likely fall short in achieving the annual average supply from the RMC aquifer system as intended in the District's comprehensive water system plan. 2.2.1 Source Alternatives An alternative to the Well 21 site supply would be to purchase additional permanent water from the City of Tacoma. Assuming the replacement source would need to be equivalent to the District's 2003 use of the Well 21 site, the District would need to secure an additional 1.44 mgd annually and 1000 gpm for peaking supply. At Tacoma's 2001 rates, their System Development Charge for this type of supply would cost about $4,435,200 million (see Appendix B). In addition, the difference between purchased water costs from Tacoma and Lakehaven's power costs for producing water from the Well 21 site equates to approximately $463,500/year in added operating costs. Other capital improvements to existing intertie facilities would also be needed to accommodate these flow rates. Consequently, the option of installing filtration facilities were determined to be more economical as discussed below. 2.2.2 Well Facility Sizing Alternatives Well 21 will be assumed to be producing its maximum well pump capacities for design of the filters, and the District's comprehensive water plan recommends that these facilities be maintained at their water right capacities. The current capacity and water right is for 1000 gpm and this will be the criteria for sizing the filtration capacity for the well. The capital cost for the treatment facilities is estimated at $505,000 (see Appendix C). 2.3 Regulations The project falls within the jurisdiction of the City of Federal Way. A preliminary determination of the building requirements from the City of Federal Way was that a Process III Project Approval would be required. The city's Process III approval would include, SEPA, electrical permits, and perimeter landscaping modifications to meet visual screening requirements. Page 3 - Project Report: Iron and M,...,anese Removal for Well 21 Since this project does not propose to increase or change the conditions of the District's current water right for Well 21 (Appendix D), no water right modifications are required from the Department of Ecology. 2.4 Bases of Design for Source Development Since the source well for this filtration project are pre-existing and are not proposed to be modified, this section simply describes the existing source facilities. Well 21 was completed to a depth of 146.75 feet within the southern region of Redondo-Milton Channel (RMC) aquifer system. The well consists of a 16" diameter casing to a depth of 94.2 feet with an 10" screen from 94.2 to 104.2 and 114.2 to136.75 feet. Initial pump testing was performed at 1000 gpm and DOE issued a Water Right Certificate (G1-23853C) with an instantaneous limit of 1000 gpm and an annual quantity limit of 1300 acre- feet per year. The Well 21 design and construction data for the well is contained in Appendix E. 2.4.1 Pump Sizing Based on the original well pump specifications and hydrogeologic reports, Well 21 consists of a Byron Jackson pump designed for 1000 gpm with a 150 hp motor. The electric motor driver for the well pump requires 460V, 3- phase power. 2.4.2 Piping and Meters The plumbing from the well is shown on the design drawings in Appendix O. No modification will be made to the control piping or meters. 2.4.3 Well Enclosure The existing well head are located inside the well house which also houses the chemical treatment and electrical controls, as shown on the design drawing in Appendix O. 2.4.4 Electrical The existing electrical power to the site is 460V. Electricians evaluated the existing power requirements of the site and those from the filtration project and determined that the existing building has space to accommodate the project's electrical needs. Page 4 Project Report: • - Iron and Ma._J_,nese Removal for Well 21 2.4.5 Method of Operation Well 21 can operate independently or in combination with other wells the district has depending on the production needs of the customers. Well 21 will operate daily to achieve the maximum annual supply of water from the Redondo-Milton Channel aquifer system. 2.5 Source Water Quality Historic water quality data from Well 21 has shown that the local aquifer have met all primary and secondary drinking water standards with the exception of manganese. The well has also routinely passed all organic chemical, microbial, and disinfectant by-product testing requirements. Data from the District's 1998 iron and manganese monitoring program is included in Appendix G. 2.6 Source Protection Well 21 has not been shown to be directly influenced by surface water; consequently it is regulated as groundwater sources by the Department of Health. The well is located on District owned property. The area around the existing wells is protected by a 6-foot security fence. The 100-ft standard sanitary control radius is completely contained within the fenced property. The District's Wellhead Protection Program is discussed in the Lakehaven's comprehensive water system plan (Ref. 1, chapter 7.2.3). Included in Appendix H are the 1, 5, 10, and 100 year capture zones for Well 21. Additional detail information is included in the District's 1996 Wellhead Protection Area Definition report (Ref. 2). Page 5 • Project Report: Iron and Ma„yanese Removal for Well 21 3 Treatment Design Iron and manganese filtration is being recommended to primarily reduce natural manganese concentration from the groundwater produced at the Well 21 site. In addition, filtration will reduce iron concentration from the water and minimize overall mineral deposition in the nearby distribution system. 3.1 Introduction and Background Lakehaven's comprehensive water system plan discusses the various system-wide water quality issues that the District needs to consider (Ref. 1, Chapter 10). Among the most important issues to address were corrosion control, as mandated from the Lead and Copper Rule (Ref. 1, Chapter 10.2.3), disinfection to accommodate addition surface water supply purchases from Tacoma, and impacts of the anticipated Groundwater Rule (Ref. 1, Chapter 10.3.2). Since the addition of a disinfectant or oxidizer in to the distribution system would likely increase the precipitation of iron and manganese form the groundwater supplies, the control of iron and manganese would also need to be considered in developing the District's water quality strategy. The comprehensive water system plan strategy was to address these issues in a phased approach. In the first phase, the District would provide gaseous chlorine disinfection at all its well supply sites and use an ortho/polyphosphate blend that would inhibit corrosion while also providing a means to sequester the participation of iron and manganese. Corrosion Control monitoring for lead and copper would be conducted to determine if additional corrosion control measures would be necessary. Phase two would provide additional corrosion control using caustic soda to adjust the pH of specific wells if necessary (Ref. 1, Chapter 10.2.3). During the monitoring period of phase one, the District only found it necessary to add caustic soda at its Well 15/15A site to maintain corrosion control compliance. At this well site, raw water pH was typically at or below 6.7 standard units. In June of 2003, Department of Health (DOH) accepted the District's "Corrosion Control Compliance Report for 2002" and issued optimal corrosion control parameters for the ortho/polyphosphate corrosion inhibitor and a minimum pH of 7.0 for the Well 15/15A site. While the ortho/polyphosphate provides the District with the necessary protection for corrosion control, it also serves to mitigate additional precipitation of iron and manganese caused by the addition of disinfection. However, the sequestering ability of the ortho/polyphosphate can not completely control the formation of iron and manganese deposits in the distribution system and water quality associated with these minerals still needs to be managed. Page 6 Project Report: , • Iron and Ma..a...nese Removal for Well 21 The District's main cleaning and flushing program is the primary method for minimizing the accumulation of these sediments in the distribution system. Lakehaven's comprehensive water system plan (Ref. 1, Section 10.4.3) discusses the control of iron and manganese in more detail. However, system disturbances from contractors, hydrant use, and flow reversals, continue to cause periodic and isolated water quality problems due to unstable mineral deposition of iron and manganese. As a result, the District is pursuing filtration to reduce the accumulation of iron and manganese deposits around targeted source wells. 3.1.1 Treatment Alternatives To remove the iron and manganese from the system, the District pilot tested various methods of filtration for its wells. Pilot Testing was done on Well 21 with the results of the test outlined in Appendix I and utilized the Atec filter system that has been used at other District well sites. The District has also pilot tested Well 9, with the highest manganese concentration, Well 19A with the highest iron concentration, and future Well 29 with a hydrogen sulfide and ammonia component. Lakehaven performed the pilot testing at Well 9, with the aid of Atec Systems Inc. and Engineering and Economic Services (Ref. 3), and employed Engineering and Economics Services for testing Well 19A (Ref. 4), and Kennedy/Jenks Consultants for Well 29 (Ref.5). Both adsorption/filtration and oxidation/filtration processes were evaluated at Wells 9, 19A and 29. Manganese greensand media, Pyrolox°(or pyrolusite, a manganese dioxide ore) media, and manganese oxide-coated silica sand media were piloted. Chlorine as the sole oxidant and chlorine with potassium permanganate were the oxidants evaluated. An aeration and lime coagulation filtration process was also evaluated but not piloted. While all the methods were considered effective at reducing the iron and manganese levels below the state Maximum Contaminate Level (MCL), the most economical processes utilized the greensand and Pyrolox° media, which were nearly equivalent in treatment performance and costs. To further differentiate between the two, the District also considered whether the process could be consistently used at any of the District's well sites, whether it minimized additional chemical use, and how simple the facilities would be to operate. After review, the District selected the Atec System, which utilizes the Pyrolox°media and adsorption/filtration process. The Atec system appeared to provide for high-rate filtration with a smaller system footprint. The adsorption capacity of the Pyrolox° media could also be maintained with current chlorination equipment, generally without the addition of other chemical additives. Adding potassium permanganate would not typically be Page 7 Project Report: Iron and Mai.,anese Removal for Well 21 needed unless the use of this supplemental oxidant is warranted to reduce chlorine use. In addition, the backwash characteristic of the Atec system, without air scouring, provided for a more simplistic overall system from an operational standpoint. 3.1.2 Well 21 Water Quality Historic water quality data from the Well 21 has shown that the local aquifer has consistently met all primary and secondary drinking water standards with the exception of manganese. Iron and manganese monitoring performed in 1998 (see Appendix G) showed the groundwater concentration of iron and manganese varied with use. The average raw water iron and manganese concentration for Well 21 was 0.059 mg/I and 0.165 mg/I respectively when pilot water filtration testing was being performed on the well. Manganese concentrations at Well 21 are over three times the state MCL of 0.05 mg/I for manganese. Typically the iron content of the water from the wells is below the state MLC of 0.3 mg/I; however the proposed filtration method for manganese removal is also effective for iron removal which is problematic in other wells operated by the District. The pH of the raw water from Well 21 will vary slightly, but typically average 7.8, which is sufficient and would reduce the caustic soda the district is currently using at Wells 15/15A if Well 21 was filtered so that it could operate instead of the Well 15/15A wells. Hydrogen sulfides can effect the chlorine demand needed for the treatment process, however natural hydrogen sulfides present at other district wells, appears to be absent in Well 21. When pilot testing the ATEC treatment system, the District monitored these constituents for Well 21 to evaluate the effectiveness of the pilot treatment system. The results of the pilot study and the filtration pre-design report were reviewed and approved by the state DOH on October 14, 2002. Well 21 excerpts from the report are included in Appendix I. 3.2 Treatment Description The site will be provided with 1000 gpm of filtration capacity for iron and manganese removal. The treatment system will operate daily to achieve the maximum annual supply of water from the Redondo-Milton Channel aquifer system. The water quality and treatment objectives are described below and in Appendix I. Page 8 Project Report: - , , Iron and Ma nese Removal for Well 21 3.3 Basis of Design for Treatment Facilities In order to meet the secondary compliance standard for manganese at the Well 21 site, the District will install skid mounted Atec System Iron and Manganese Filtration system utilizing Pyrolox°media for the adsorption/filtration process as tested in the pilot study. The performance objectives of the treatment system is to remove iron and manganese to levels reliably below the secondary MCL for these constituents (0.30 mg/I for Fe and 0.05 mg/I for Mn). It is also important to the District that other factors, such as chlorine residual and pH remain relatively unaffected following the treatment process. The water should maintain a pH of 7.4-7.8 standard units and free chlorine residuals leaving the treatment plant should be between approximately 0.4 to 1.0 mg/I. The reduction in the iron and manganese content of the water will improve the local aesthetic quality of the water and significantly reduce the deposition of these minerals in the distribution. The District will however, continue to use a corrosion inhibitor of ortho/polyphosphate as recommended in the District's comprehensive water system plan (Ref. 1, page 10-45) to prevent dilution of the inhibitor when water from this site blends with similar or lower pH waters in the distribution system. 3.3.1 Media Pilot testing utilized Pyrolox° AS-721 media for the adsorption/filtration process and will be used as the bases of design. This media is a manganese dioxide ore with a particle size of 8-to-20 US Mesh, and NSF certified to ANSI/NSF Standard 61. For design specification, see Appendix J, section 8. 3.3.2 Filtration tanks The pilot testing for Well 21 was performed at a loading rate of 10.31-10.91 gpm/ft2 (see Appendix I) and produced on average 99% manganese removal and water with a manganese concentration of only 2% of the MCL. From available standard filtration tank sizes, the pre-design report suggested 48" diameter filters. Sizing calculation confirm a configuration of 8-48" diameter filters would be sufficient to keep the 1000 gpm design capacity at a loading rate of less than 10 gpm/ft2. See Appendix K for sizing calculations. The nominal system pressure at the site is 142 psi. The tanks will be welded steel, designed for a 200 psi nominal pressure and tested at 300 psi. The height of the tanks shall be sufficient to provide for 3 feet of media depth. The completed filter system will be built and delivered on one steel skid with Page 9 Project Report: Iron and M.....,anese Removal for Well 21 eight tanks mounted on a skid. For complete tank design specification see Appendix J, section 1. The additional head loss needed to pass water through the filter tanks (2-3 psi) will not significantly impact the production rate from the existing pump. Since the designed total dynamic head for the well pump is high, this small amount of additional head does not translate into a significant loss in production. In the future, when the well pump is replaced, the small additional head can be accounted for in the new pump. 3.3.3 Finish Water Quality From the pre-design report (Appendix I), this filtration system will reliably maintain iron and manganese levels well below the secondary MCLs for these minerals. A properly functioning system should provide typical removal rates of 95+% for each of these constituents. 3.3.4 Coatings The interior coating for the tanks and piping will be NSF certified to ANSI/NSF Standard 61. See Appendix J, section 2, for coating specifications. 3.3.5 Backwash System The filter backwash system will function automatically by either a set pressure loss through the filters, at designated timed intervals, or manually. The typical pressure differential through the filters will be about 2-3 psi. Automatic pressure backwash cycles are designed to operate at a 5 psi differential. With a media absorption capacity of 0.26 lbs/cf, the system could conservatively function after 10+ days before backwashing, even if it is assumed that only the first foot of the three-foot media bed provides the absorption limit. It is the manufacturer's recommendation however, to backwash the media on a timed interval between 12 to 48 hours to avoid minerals penetrating too deep into the media. This is meant to ensure that the short recommended backwash cycle times from 3 to 4 minutes are effective. It is expected that the backwash frequency of 48 hrs will be sufficient for operation of the filters at the Well 21 site, since that is more frequent than Well 20/20A backwash with similar water quality and is backwashed every 72 hours. Backwash rates will be set between 26 and 30 gpm/ft2 or 327 to 377 gpm as specified for the media (Appendix I). Backwash flows will be metered and Page 10 Project Report: Iron and Ma.. ,anese Removal for Well 21 controlled by a partially closed gate valve on the waste discharge piping (see Appendix J, section 6). 3.3.6 Backwash Disposal System The backwash disposal options typically include discharge to stormwater, infiltration system, or sewers. If backwash water is discharged to surface water, then the backwash disposal system must comply with the Department of Ecology's Water Treatment Plant Industrial National Pollution Discharge Elimination System Waste Discharge General Permit guidelines and policies. The general effluent limitations for discharging to surface waters are listed below. Effluent Limitations per DOE General NPDES Permit Parameters Average Monthly Maximum Daily Settleable Solids 0.1 mI/L 0.2 ml/L Total Residual Chlorine 0.3 mg/L 0.5 mg/L PH Within the range of 6.0-9.0 Within the range of 6.0-9.0 The Atec filters are expected to have a backwash chlorine residual concentration and settleable solids above these average monthly limits. Consequently for surface water discharges, sedimentation and dechlorination would likely be needed to reduce the effluent parameters to within these general NPDES permit limits. Discharges to land and to sewage treatment plants by water treatment plants do not need to be covered under this General NPDES Permit. Wastewater Treatment Plants are already required to have an NPDES permit and Ecology has determined that water treatment plant discharges to land do not typically require a permit because the removed minerals are filtered by land and hence are not discharged to waters of the state. Discharges to land are those discharges that are designed to be completely contained by land with no reasonable potential, during all weather conditions, of discharging to surface waters (Ref. 6). Sewer disposal is available, however the capacity of the sewer system is limited by an 8" diameter gravity pipe. Backwash water discharges will need to be controlled to minimize the potential of surcharging the 8" sewer line. An infiltration system has proven to be very successful at other sites the district has. There is an existing infiltration system on the site that handles stormwater. The sizing calculations showing the needed size of the infiltration pond maybe found in Appendix N. The infiltration pond that is currently on site will be expanded to handle the additional water generated by the filter backwash system. Page 11 • Project Report: Iron and Ma.. anese Removal for Well 21 3.3.6.1 Backwash Water Quality Assuming a backwash frequency of every 48 hours and a 4-minute interval per tank at 377 gpm, the total backwash water produced will be approximately 12,060 gallons for all 8 tanks (average of 6,030 gallons per day). The calculated concentration of iron and manganese in the backwash water is estimated at <57 and -158 mg/I respectively for each mineral. Backwash water quality calculations are shown in Appendix L. Since treated water is used for backwashing, the chlorine concentration of the backwash water is expected to be nearly equivalent to the targeted finished water quality of 0.4 to 0.7 mg/I. These ranges are typical of other system in the state discharging to land (Ref. 6). 3.3.6.2 Sediment Tank A large settling tank for backwash water is proposed as part of the filtration on this well site, because of the high concentration levels of iron and manganese. For ease of maintenance, this disposal system includes a sedimentation tank to reduce the actual amount of iron and manganese reaching the infiltration pond. The tank is sized to provide approximately 48 hours of detention time when Well 21 is in operation. The detention time is estimated to provide approximately 90% removal though direct settling of the largest oxidized particles. Calculations of particle sedimentation and removal estimates are provided in Appendix M and the resultant final backwash water quality reaching the recycling pump system is shown in Appendix L. The final recycle backwash water is estimated to have iron and manganese concentrations at about <6 mg/I and 16 mg/I respectively. The benefit of collecting the solids in a sedimentation tank is that it can be easily removed with a Vactor/tanker truck and disposed of at the District's wastewater treatment plants or blended with construction spoils. It is anticipated that less than cubic feet of mineral sludge would be removed every year from the sediment tank. 3.3.7 Chlorination The Atec Filtration System will use chlorine in advance of the filters to oxidize the iron and manganese and to regenerate the filtration media. From the pre-design report, approximately 1.3 mg/I of chlorine will be added to the raw water. The oxidation and regeneration process will reduce the chlorine in the finish water to about 0.6 mg/I. The existing gas chlorinating equipment, using 150-lb cylinders is sufficient for the dosage rate proposed. Page 12 Project Report: Iron and Ma..,anese Removal for Well 21 3.3.8 Sequestering Neither the proposed filtration system nor the finish water requires the addition of ortho/polyphosphate as a sequestering agent for iron and manganese. However, the continued use of an ortho/polyphosphate is recommended as part of the overall corrosion control plan for the District. Injection prior to the treatment system will hinder the performance of the iron and manganese removal system. Consequently, the sequestering agent will be injected downstream of the filtration system at a dosage rate of 1 to 2 ppm depending on requirements of the District's overall corrosion control needs. The current injection point, located inside the pump room for the two wells, will be moved to a vault following the filtration treatment process as shown in the design plans (See Appendix 0). 3.3.9 Security The filtration system will be located within a fenced site. The fenced site will provide the same level of protection for the filters as it does for the well. All the chemicals, pump controls, and treatment equipment remain inside the well house. 3.4 Construction/Testing/Disinfection All potable piping will be constructed, pressure tested, and disinfected per Lakehaven approved material and construction standards (Ref. 7). The filtration system shall be disinfected per Water Plant Disinfection Standard ANSI/AWWA C653-97. For specific steps in the startup and disinfection process, see Section III of the Operational and Maintenance Manual for the ATEC Filtration System, included in Appendix P. 3.5 Operations and Maintenance An Operational and Maintenance Manual for the ATEC Filtration System is included in Appendix P and provides the detail discussion of the system components, including; operating parameters, start-up procedures, maintenance frequencies, spare part recommendations, and others. As of 2004, the District has three employees with Water Treatment Plant Operator II licenses and one employee with a Water Treatment Plant Operator I license capable of operating the proposed filtration system. While operational simplicity is one of the reasons the Atec filtration system was selected, depending on the Department of Health's evaluation and classification of the treatment facility, additional staff training or certification may be required. Page 13 • Project Report: Iron and Manganese Removal for Well 21 4 List of References 1. Kennedy/Jenks, 1998. Lakehaven Utility District Comprehensive Water System Plan Update, November 1998. Approved by DOH on March 20, 2000. 2. Robinson and Noble, Inc., 1996/2001. Lakehaven Utility District Wellhead Protection Area Definition, June 1996 and May, 2001 Addendum. 3. Economic and Engineering Services, Inc., 2001. Predesign Report for Iron and Manganese Filtration at Well No. 9, July 2001. 4. Economic and Engineering Services, Inc., 1997. Well 19A Water Treatment Study, Pilot Study Report, August 1997. 5. Kennedy/Jenks Consultants, 1997. Pilot Plant Study and Preliminary Design Report, Well 29", October 1997. 6. Department of Ecology, Keith Johnson, 2000. Fact Sheet For NPDES General Permit Water Treatment Plants— Wastewater Discharge, May 2000. 7. Lakehaven Utility District Water Standards, November 1998. Page 14 Appendix A: Vicinity Map \ o I N.W Section 29, Range 21 N., Township 4 E. AHoe i ---_,_. •--. \ lit rif P: A, AIL • "OilligRrill!a —111 1 , 41111101.1k9,11 Project 1 1 \ I Location ��'�� ,�r � Ia...., , - ' • I i • i I EDGE OF WETLAND BOUNDARIES \ 1 N I SHAPEI Y OF FW WETLANDS I Vicinity Map PER 1 Not to Scale I 1 _ \ STREAM BASED ON CONTOURS AS 1 \ / PROVIDED BY CITY OF FW I 1 8"PVC SS IN2921049154 / Site Statistics 1 , STREAM AS DIGITIZED FROMI- Site Area= 81589 sq ft DISTRICT RECORD DRAWING Impermeable Surface Construction: I 1I- 1 a •__ o - e �� -e e- - — — —5` SETBACK LINE— — ---4( 16'— , — r—I I Pad for Filter: 180 sq ft J 1 ` N I1 Backwash Tank 152 sq ft 1 I APPROX. TREE LINE RIP-RAP 0 1 CV Vault 20 sq ft Less Exist Asph 352 sq ft PI 1 RESTRICTOR MH E 1 97 50 x i Total sq ft 1 W 3/4"ORIFICEI GI 8' E. ,58.o zwl Occupancy: None I. Row lY •� a SUP ,r N,,,,,,,,,_, CHEMICAL I Parking Stalls None m o2P aI 1 I I I DG PowER 3 31g 1N 2921049031 E.200.5 1' WELL 1 93 I I 1 o5 l o HOUSE C VALVE 1 a IN •DETENTION BELOW WELL INV r T I -- _ V J I m - ,i 202'=2380cf - \ ' 0 I 1 r CMP STORM DRAIN , Al • Q • RAW WATER o V/ XFMR pIpNC, o EDGE OF 12' WIDE PAVEMENT A. 011,� , 1I-II �to `� I.E.-201-0 1 a-+ I I 1 1 / "� 1 / �� CHECK DAM o 1 ���i,"�e+ "� ELEV.-204.50 1 0 Av �'• I' FILTERED 1 C— 1 GTE ,...\��V ASPHALT I I 'CO.�j1I WATER PIPING / GATE ;�11, ill FILLT R A MRI Y 2'DI w �..' ( m I 1 , 2"WATER SERVICE 6-DISCHARGE rr _ _5' ETBAC LINE � �_ , -AIR GAP I I SAMPLE STATION - I 2921049069 weoeAcxwAsrl I z GAL)(8'x195c8'.8/80 \ N = ' n \GAL) I 1 o a 1 \\ I I I o oI \ I ; 0 1 I I I I I I I I 1 I I 1 I I I 2921049078 1 1 I 1 I 1 II F I ` , I I LAKEHAVEN UTILITY DISTRICT KING COUNTY WASHINGTON / • 200 SETBACK LINE Well 21 Water Filtration �`'-- -- -- - ri---------------- ------------------------------- ---/_ �/ SITE PLAN • S I TE PLAN DATE:5/10A2 SCALE:NOTED Z SCALE: DRAWN:RSL '7'. SHEET 1 Note:Contours as provided CHECKED:JCR - riii�;= }►f� w by City of Federal Way FILTER WELL 21 SITE_RSL_5/10/02 APPR:DTP OF 2 S - , t. .... 0 !:"*",,, i--- \ I I \ .3 1 nil a /I S "V p,;_____,51 1 L_ ,i-------17 1 17.‘_1----- \. ! ' / /�// ST f/ ,. / N fro NS JJTN IN ! ( L;;,. il %\ i _-ftL , ~ice` j ltf 3 4. v �i --------- i ii !� _�_� • is 344TH STD _--_l"�--I r ,,f_ el, ZAW01* K-1 '1. \\ - UM — ----t- .7, (( / 4. j Jr k ...1� 1 \ ` j. Qs-J.,,', T !y s l \ I i; w' 1 a 1 A `_ �J I / /, 346iH s47,H 1 sw u7TH ��-.l •. _ s y g sid/ y sw J461H ti 1•n" c ;; I — s�eryl• }. S J46,H sr — I gill! / / 0 • ... Wk.LL -�- JrHPL? \ 4 # 4 - I- 1 460 _ yT Rv 3 € ,;---.-...,..:.:-.. =.,=.:..-air/ A__.,4PC,A? i ,eiti ... -;sT .....i_i li g: bill�y��-may 7c j 33 �SCYs y I ` I / jf r^^^..•..y ' A I E \.i`rl S JS6TH ST 1 1 JSWH CT 111--���'-'— �--`—_lam $ sserm J sw J36TH sr I Errs r r I `—� COO ' I - Y W Y x sw J 7TH sr x 7 's JSBn!sr' / _ sw sr Y I j/�—"'�_ S 359TH sr L91 -j ! � ,, // fit, / .: fI I"r.A1G1-1 JB,sricr, ( d k f J)?.�I:CzH N I N a iftiEL11lHSI_ �sw J6JRD r4 mL 1I i —__j' / /1 ,�� —1, I Y! 1 S 363RD 1. e 7 / ;7/ • ' I SM JBBTH Sr filliri `,.- ' I i ( '^ rrt //// 'P1\ I1� pia LEGEND Kennedy/Jenks Consultants N LAKEHAVEN UTILITY DISTRICT WELL 1 a WELL AND IDENTIFICATIONi' 10 YEAR CAPTURE ZONE WELL 21 CAPTURE ZONES 5 YEAR CAPTURE ZONE 0 1 8MI. 1 4MI. 1 YEAR CAPTURE ZONE 006090.00\PO 1 SK012 .nnrnnvu.Arr crAi c ,u ►11 V' Project Report: Iron and Manganese Removal for Well 21 Appendix B: Estimated Water Cost from Tacoma • Estimated Water Cost from Tacoma Assume: Without Well 21 will need 1000 gpm continuous from Tacoma Well 21 Average 1000 gpm 1440000 gpd peak capacity 1160486 gpd water right Water only 1551 ccf/day TPU 2003 Power only LUD cost ccf/mo Cost per LUD 2003 of Power ccf Month Days gal/mo cost/mg to Produce January 31 35975070.25 $ 234.00 $8,418 48095 0.785 $37,755 February 28 32493611.84 $ 234.00 $7,604 43441 0.785 $34,101 March 31 35975070.25 $ 234.00 $8,418 48095 0.785 $37,755 April 30 34814584.11 $ 234.00 $8,147 46544 0.785 $36,537 May 31 35975070.25 $ 234.00 $8,418 48095 0.785 $37,755 June 30 34814584.11 $ 234.00 $8,147 46544 0.982 $45,706 July 31 35975070.25 $ 234.00 $8,418 48095 0.982 $47,229 August 31 35975070.25 $ 234.00 $8,418 48095 0.982 $47,229 September 30 34814584.11 $ 234.00 $8,147 46544 0.785 $36,537 October 31 35975070.25 $ 234.00 $8,418 48095 0.785 $37,755 November 30 34814584.11 $ 234.00 $8,147 46544 0.785 $36,537 December 31 35975070.25 $ 234.00 $8,418 48095 0.785 $37,755 365 $99,117 $472,648 Operating Difference= L$373,531 J Capital Cost Tacoma System Development Charge Average day use of 1,440,000 gpd $ 3.08 gpd Total Capital cost of Tacoma = $ 4,435,200 Est. Capital Cost of Filtering Well 21 = $504,896 Capital Difference $ 3,930,304 Well 21 DOH Project Report Project Report: Iron and Manganese Removal for Well 21 Appendix C: Project Cost Estimates for Facility Sizing Project Cost Estimate for Facility Sizing Well 21 capital costs to produce 1000 gpm Note the project will be designed to handle 1000 gpm 1000 gpm is the long term pumping rate from Well 21. Description Costs Electrical $48,000 Yard Piping $60,000 Landscaping $5,000 Site Work $20,000 Subtotal $113,000 Filtration Equipment $125,000 Filter/Backwash Tank Pad $24,000 Chemical Feed Equipment $8,000 Controls, Air Compressor $25,000 HVAC $12,000 Settling Tank $25,000 Recycle pumps $30,000 Equipment Installation $30,000 Subtotal $279,000 Subtotal $392,000 Sales Tax(8.8%) $34,496 Subtotal $426,496 Engineering/CM at 20% $78,400 Subtotal $78,400 Total Project Cost $504,896 Well 21 DOH Project Report Project Report: Iron and Manganese Removal for Well 21 Appendix D: Water Right s Ili UUU VUUououc� UUUoo « aaaaaa aau net' ! g f E i f r2 i i f i f f f f f l J 3 W W W W W W W» W -' s J m W`_ ¢ K 2 C Q ft (L K Q K ¢ ¢ K Q¢ f f W W O O O < W 2 C zO1- Wtlt]"'.'®""[ MEN 1111111111 zry1 N N 0 I 0 0 0 Ili iii am< Nm d o0 17 1111111 3t7NO J ' O p � a` _' iiiii 1 O Hihillip n n F. 11111 1111111 N as 'ill iiiiii � -: gN : g 88 r0 88e 8888 iiiiiiiii SQ pppW G LL W ? 8 I ' amo ao ;m mm55lo = N W là � 2q 0010100:000:10: r‘li :MOOS " 43;47.776 Q � � tl W 3 g 3 lo' iiiI1iH m;O L� v o -- — F Oj/' 1� Z O H W tl���'� �. �. 1D LOU) cg Q ®1®1[E LLLILLL _ - G 6 iiiiiiiF O O m- n n QV a. � [') ni m m 474 < O V d2 2 : 1Oir • don d w `�Da 6 b 2 CI Wo f c% N .- - M 0 8 tl G Z O O O p 1D ` O "Will l'OI100 00tlN Milli iii 7£ 1 N O m v _. ; !!!! s _ _U- Fry~ 1V111111iiiiii aN +Q tn r n 0 0 o 0000 III ill a 0 W W W W O. d dY Oy q2 N a a N d Q .- N Q Y Q O N d d Q d O W N W S D � ry y Nn 3m ;NNNNN! WON^ LL n15 ryONNNNt7 Ls NWm F sgmryN J N v3! N V) z tOV N i z z N N N 5 N z N 'r N f� 3'1 3 J °D Z w i 1 3 1 3 m Z in Z r6 3 N 3 m 3 Z = Z y 3 Z Z i ! N` m Z m ; 'Z 3 i 3 N Z =3 Z p W 2 N 41 Z Z Z !3A Z N N ') Z Z N N N Z Z i Z J; (Jl Z Z C7 U N 41 m W Z f� O g < m Z 11g;; : :'-'- i - r o(S il ~ o - o 0 0 0 o Q d d d d d o o d o d 0 c ) o , !ail 0 0 0 0 - U O O O O O N N N N N N N N N N y O Q d O ry f/) m 41 N ry 0 0 00 0ODv g ! 333MMiill ii Haiiii rgl • N ] 1D W 7 J 7 7 7 0 W i m m T Z Z t CC O & O Z W 2 W Ls,la! U U = 7 7 Q . m m m m m m o a o r ^o zOHW•0 ,.., ,..., „, v . a . .0ZOI- IAA m 17 . a —(� 2 2 n 0 80 �N NN a. a N N 0 5 p 5 —— o O al1D as a f f = mom0° cm p CO 4C3 00 g o f0 m� n • m� mr,_ X2 3 0000 0 0 3 a <000 10 N a OO l.- n 0 0 X n&a '• �( -N r�r, 000 • O 4G ,=U ~ O -CC f o Q W 2 m G - — _ S 1 I.I. -� /cam m V W O m 2 I V IL W N t'� O o ; o3 �� aa m 0 o god o0 0 W O 00.• N ccl Cn 4 — O ! it. g O N tV lV N Co'N /A Q 2 O g ^ CD n N F 0 7 r ^ ^^ --CD ^ Vi F CO W 2 Ce g 2 s — — r' a Ur g a C7 ii Iv W g 'ieWe avnlo —o iO ►- g . s oiO oa m3 CC 3 S07 1c 1O 1O 10 -A,n 1O CC 3 ,r00 CD ID Ino Q O CC LCC _` S3 •e r D. z O N W p m m m m 1p m Era r = O 1,. W�y m m m m, W ---- - Q ,-- — -- --_ 00000 0 5 IL M Q o' 5 e< W `6 S —< 1- Z W O 0 ID W `0° 0 Q F Q F O d n 0 0 0 0 o o 0 CC a 0 o 0 0 0 0 0 0 — M a n z U z O cc ce U 3 N r2 3 Za m� �/��/�� Zao m� a u G cn 3 LL O 0 a a <--. 0000 0 0 O 0 0 0 0 0 0 4 LL O f m < ~ 3 o ' cLL U i 6 ' i C p a c— ,,— 4 m 3 ~5m < ro1Qoo Z a m < ►~i. m omoNN a n a . a c5aW cr ^ ^ m a �. m m C4 10 m o o p V < t el 1 0 = V ' e co � m CC N � o .. k O ^N N N f 5 - a W — LW m m m ,p tl • ID 15 J co O J N ~ 0 F W 3 P . o 2 < < W W I" G m < is z '� 3 8 O U N m- aL. 0 W F ut 1U F�- = Z t Z q S N = N � rvH'~` < ��^ � � - a Om 2 H '� O o H m h m V d N N C./ N N O g N W rl r, J u tr W J U Sw Z m v nri WmW3 F 0 o 0 W Z 0ZmNN1/, W ZZZZ W y « W' $ H 2 2 m 3 1n 3 3 L.3 3 T. J Q H 2 w Z tu g Z to N.- Z Z Z Z Z Z Z J Z m ^ M n < ~ 6 f n~ e0 A t- 0 um z W r, 0 CD ID O N CI CDO 7 CC IIIV If fit 1... Z O ~ C I r g C W W Sap b ig — 5mmm0 = O . UUU1-10 6 (50 — CD ` g ` g4a, W 0 0 1.„ 0 0 V 3 0 2 O O U m y p ' H UQ 33333 033 � z ml3 33J � J p p 0 _3 f b • m • Y 0 $$ 0 O i N i ` E w O = V p -a E aI o ^1d 413.. e. - 8p 8y 80 : o g .x ; B E E a • N .6 .2 $ E S F m a a0 ms ""- off o € ww 8ggg 32 < ; Ep g y 111 II • • o .! $ n � E do • g o s .1 o • E: 4 «c nnn3 ' 3 = tif w t F F E l a E m S3 7R 7R ui > i o 3 120. .. o g ; c ° • > 7 • 74 « p p o N E ; N7 g E g E O w o w g s 2.wu n • c c • _ 0, 2 pg • 55� ' i. • n o n > o o'- o > • ' E o ••- gg E ; : go~ ty ' 4 E C i•,s 5 ii; E o a >, '� t o o 0 c 3 E _> g 'n-E ° > - r • _E. c . o L H ° • i .o i c E Ea > > ° $ a g v e $ 3 u > > • i o " S g-3 : . < w0 R .. 0 •c8 • • s lo .', } o •- ci`� > >u3,2 -> nzo� u ° c n g2tifnc 2• >! i•• ¢ g ' t i -8 n o - - « u 7:� g p p j 3 c $.Y 0 0 0 . - p 93E > ny :30 g • > TE ,.. g - nERooH > > v.0 • ° • , 3 - E , 0 ' E >c<i2E N F iiiH ! o E 2itU1 C } vgJc7O " NEm _C : pZ m u o' cr`o p y pa o i : E u ; a • § o • > > = 'w .E v E.CCE • E $ E 3 -2 +« m • p c c c E 3 Q O LL 6 y ' g 2 > O ' w J n O A O O O J s O g O . w ' O 2 C Y • C O C ._ M > > v E g • N w O t C C J c f- oLL 3 �i- � 3NcS, ogoo _ LLou2fofoa8�4 Zao : u � ao•Uu° W� : : � 1x3 ; soocNU°c°� U < 2 w"' N e7 O acr o O to N PN a 10 G m m O N t7 y LO D n 0) m 0 N Of O 10 V O O O IO ID 10 10 10 10 1D 10 l0 10 m 0 w m m m o m c 0 h n n r. es.. 2 M 0 a • u .. JL .- _ U E E _ a > •fl 1D > w • 1• _s o 0m' - " E � � o a 1.12 2 mti_ *.- 3 tA o • o o i 2 a s 01015 g LL • ; e - o - • O O .oZ cE 0 o .p ¢ Y • c U c ' e N < �p c C7 22 n • o 3 o O Q � O o n U �. o z� o c 8 T. . c. - • $ u g � U i • U « « « « U C7 . 1- T L ., o : c c oov > -z g o E E o + U 3 « • o U � Q . ' i 3 .c .c w o g l p 2 . . 0 >3gu ; 3333 >NZ ,00 Q< ; .g go = uo ° o vn : • E 1 « 33 0 03 C> � c o` 8c� � -_ a � FQy 93 ¢ o -2 ` oi� " iy � ?3 O Y J 0 0 n y x , Y n • - O O > T A L ; - 7e ' i c U • o • U U o o v w w o • O v `o 00 >_ 1 n 5 c o o > 2 • ° 3 i - g 0 o U 8 • c U U g g>, LL = pc .. c n a m .• E a o 3 w pM s o "n y • U t ' w $ • 0121,7 o g E Y Y a a a i N Y o g .. o g C a, : — J 7 y < .- _ 11 ?Y y E n _ • � YY w < U $ x1 &W0 o` U = OC c gE 4 YY2 .. ). 3 4p4 - co UDL 0. 11p ow o T W N U J a U eO a O N I e j •c e N N N 2 N N N N C a F O Y w g C- u w V • cc n 0 .3 s Gi ? o3 '° o " ' L W e f ("40. 1 N MTI2z • ' .- 8 c"-2 F : « 1, = g 83 O �ruu_ J J J z 3 g 3 3<'< u c� g i 2.o z u x o m:a o Q W W x 2 2 2_ & ? 233 2 3 1 m g f 2_ an .f 10 f0 m U w- N N7 O 10(O n m m 0 .- 0 - N N•1 O ID m , m 01 O U 0 - NN QNnnNOw NorOO 2 2 Cr ii w w N < 2 w 3 , • e a . a E • 8 a c T • O N • UT > g a • c Y • o. •• 5 t r m n • CC m F ' L g I go lit o _ o wZ « c i o m € ` , c -co E T oloi-o"- .e S ! •z y N O C G et -2 T 1 : o p I g a oB latl _ —o� m .Y.ty : E I 3 s z-.1 8ei. n g pp coo S m! c o ▪ 4 1 ` .o N • .o i G r 8 0 . E E ai x c c Lc E CO o m25,4 8?t - • ' a F- w o 2 -- o N 2 4 - 4 g _ ; o - 7-] 1 gg >o >o .s 3 �L $ e .4 w • � n o n^ 8x t Q' a c e o , ° o 0 0 8 $ et 7 • 'ro w w O « ►� F- • E: o o c o 3 u ; W Q =6 E • a a E ~ • — o f c b J y c $7 1 n $ ;" g 5 . fa O Zia iikil►L- c°� com' Q N N N N N N ' 2 To co8 c o 0 ce c I T EEp n} LgL. 2 2 O 2' a ? _ C T N oo • z 2 L •▪ C > L C 4 V C 8 .4. . T g 2. - n 3 > € : " L g ;$ E "• o Ii E lit g o Iv"v Y.ti 3gc c Li it : Y8 • F 3 ; 3 c4g m o„ 3g z m ' •oa neo5' weL w l � M7 e . aL •Ym 6 8 ' m g mo c g41 ogF O C e Z O i , u : Y a • i o .* 2 > p p U . i a o z - o ; a o m • 2 c . ,,, •p : • g i FI g Up > § w ID i ")o Y C x tv o 2,11 e Ili O o < Y D e�= : o o 2 g g o o < O O 2 . c >,a ° o E • • w ).- a . • 124 o z 8 . c.a 3 z O z o z U `o o p za j U o >g i > • - o a 3 r > • - m m g Y . o rX o • .o • 'u g o : L E n F. c C - 4a E 3 m !1 m 4 C C • i e. ; ! Y a 4 m g . -, Y i p • Y L = o w G ^ •• c g 7 .eon >ao � o 'ntted -4 . 4 oir ogveo 802 E is g °8 «• 3b E " ggi .4. : o `r_ - ; °x : o :oo t c e , ' v q$ qo + .E▪ a . 1.. .63 c e • --- iio_oiOYYi3 poi oii gv_ ' � i 8� c ea c .E g.i • 5N � m > o g > > g 2 e o z . u ° : e« o 1 U g - g b : • o a • g o e : b .,'_ 7. i2«p c • . w . aa _ _ en° gY 'o D . w c .§ a• $ or, -.12 giBg 8 . n y= `0 3 a Y o g o g y a F2 .6 8 8 g-E' o• - .0 g a n 2 o i L 8 _Po . °u .X . • 3 « E ' i 8 yy E y `v o � 0 7 _s w - E � e LL LL . y LL j J , Y a Y e j o Y i o u. LL W N $ g Y C E m 1). 11 • • • - p S L g • b ffi C w Q N x »3800 > > - of > :i > : > > oE2 W 'o -+ o irle « E gm ^ • - a a v • . o o a w a X r a s a a ��`o o a E : a 1- $_ L g �a " � ° L Q•- �'' = E=1 c • LL«vo L$ >'1a 5$$ • 11 «5ayv o p Oa - u . 1 , i g a 7 r . m >i e < .0 3 ` 3 ` . 3 > e i > ` O W 3 e L e H e Z ± 3 p L L 14 O ti O 7 • • m o o` i o > > � 0 7 e ° � o 0 0 0` o v a � a o r o e Z .L W _ � v of E _n E . o c �- L'o °c'v f . • • u E E E a E ^ r E U w r 7 . r _o o f c c w • 1 . O $ o ; • $ o ° e v i'? • i g c z o o Eo n > E E E 'o E o 1 E g o • $ o o u g E c. £ •e 1 v o ar y oo ! ° g s o a a a .-i e . • 0 0 0 0 0 o e • o • e o L L 7 « > > r % 7 yadu < mUU V <` vt �Uic <` Qu < �Xocui � � � < ozr� of wm . +� « « • ia 3 `g O - N f7 Y ID m /. m m O - N P) v ID m n m m 0 - N O) O ID m -cc N l7 .71 ID n m IL m m m m m m m m m m m m m m m m m m m 0 O O O O p p . u`" ri ii a 0 Project Report: Iron and Manganese Removal for Well 21 Appendix E: Water Report "Test/Production Well Drilling at King County Water District 124 Kemper Site, May 1981", Robinson, Noble & Carr, Inc. £A) /f ell / I I TEST/PRODUCTION WELL DRILLING AT KING COUNTY WATER DISTRICT 124 KEMPER SITE 11 May, 1981 I I I I ROBINSON, NOBLE & CARR, INC. GROLA\ID WATER&ENVIRONMENTAL GEOLOGISTS .915 ORCHARD STREET WEST TACOMA.WASHINGTON 98467 (206) 4/b-7711 (j ROBINSON!, NOBLE & CARR, INC. GROUND WAI ER c.ENVIRONMENTAL GEOLOGT-T 5915 ORCHARD STREET WEST TACOMA.VVASI-' 1INGTON 99487 (206) 475-7711 TEST/PRODUCTION WELL DRILLING AT KING COUNTY WATER DISTRICT 124 KEMPER SITE By F. Michael Krautkramer May , 1981 • TEST/PRODUCTION WELL DRILLING AT KING COUNTY WATER DISTRICT 124 KEMPER SITE May , 1981 Introduction This report presents the results of drilling and testing at your Kemper site located near 1st Avenue and South 356th Street (NW4 of WI of Section 29, T. 21N. , R. 4E) . The well is the second of a two-well contract let to Story/Dodge Drill- ing in November, 1980. Work began in mid February , 1981 , and was completed April 9, 1981 . Drilling and Testing After extensive site preparation , a 72 Speed Star cable tool drilling rig was moved onto the site. Drilling commenced on February 20, 1981 , when 20-inch surface casing was placed to 19 feet . Sixteen-inch drilling continued to a total depth of 300 feet . Water-bearing sand and gravel was penetrated at 20 feet . Sorting and grain-size distribution vary within the sand and gravel which persists to 137 feet . Between 103 and 137 feet , the unit is predominantly sand. Below 137 feet , particle size grades to fine and very-fine sand with abundant silt . When drilling had reached 160 feet , the sand was deter- mined to no loner be a suitable aquifer. The casing was pulled I • I back to 140 feet , where a temporary well screen was placed from 119 to 134 feet . The temporary completion incorporated 15 feet of 6-inch pipe size screen packed with Scofield 4 x 8 gravel . Develop- went was accomplished by surging with the cable tool rig. The well was pumped for 8 hours at 650 gpm. Testing indicated that a properly designed well in this aquifer could produce about 1000 gpm. After the testing was completed , the screen was removed and the hole redrilled to 160 feet where explora- tion continued. The fine and very fine sand persists to 190 feet , where a gray silty clay was encountered. The clay had not been bottomed when drilling ceased at 300 feet . A log of materials penetrated is presented in Figure 1 . �!! Completion and Development IAfter drilling reached 300 feet and no deeper aquifer was encountered , the 16-inch pipe was pulled back to 147 feet while the hole was carefully backfilled with pea gravel . The screen assembly was designed using geologic information and grain-size analysis of samples collected during drilling. The two screened intervals are separated by 10 feet of blank pipe . Both are 10-inch pipe size 80-slot stainless steel screen of UOP-Johnson manufacture. The lower screen is 24 . 5 feet long extending from 112 to 136 . 5 feet below land surface. The upper screen is 10 feet long and is placed from 92 to 102 feet . A 5. 1-foot riser with a threaded coupling is welded to the upper screen and a I 1 I 10-foot tail pipe is welded to the bottom of the lower screen. The bottom of the tail pipe rests on the gravel backfill 146. 75 feet below land surface. During construction , the 10-inch riser pipe was extended to land surface to facilitate gravel packing of the screen and to accurately place the screen assembly. The screen assembly is packed with Scofield 4 x 8 gravel , Lonestar Pit . The screened intervals were developed bymechanical p c surge blocks attached to the drill stem. The well was concurrently pumped at 200 gpm with a centrifugal pump. After development was completed, the 10-inch pipe used to extend the riser was iunscrewed from the riser coupling and removed. An overshot packer assembly was then set on the 10-inch coupling to seal the annulus and prohibit upward movement of the gravel pack material . Prior to the pumping test , the surface seal was completed by filling the annulus between 20-inch and 16-inch casing with cement while extracting the 20-inch casing. Construction details are presented in Figure 1 . I Testing On April 7, a 6-inch line shaft, turbine pump was installed, and preliminary testing was performed. The well was then pumped at 1000 gpm for 24 hours beginning at 0800 hours on April 8 . The static water level before the test was 7. 5 feet below land surface. After 2 hours of pumping, the water level had drawn down to 59. 5 feet . Throughout the remaining 22 hours , the pump- ing water level dropped one additional foot . This near stabiliza- tion indicates that higher transmissivity materials is ini .!rcepted I I I near the well . The actual distance is unknown , and cannot be determined by testing a single well . The water level in the district ' s Well 12 was monitored during and after the test pumping. Slight fluctuations in water level were recorded. The fluctuations are probably due to atmospheric changes or in response to interference from other wells. Well 12 is about 2000 feet east of the Kemper site. Drawdown and recovery data collected during testing are presented as Figures 2 and 3, respectively. Water Quality At the conclusion of the 24-hour pumping test , water samples were collected. One sample was submitted to WMA Labora- tory of Tacoma for inorganic analysis . A second sample was submitted to Laucks Laboratories of Seattle for corroborative iron and manganese analysis . A third sample was analyzed in our laboratory. The WMA analysis shows a manganese concentration of . 26 ppm. However , Laucks Labs tested Mn at . 088 ppm. Our analysis indicated . 10 ppm Mn, which is in close agreement with Laucks results . The . 088 Mn concentration is above the . 05 ppm D. S.H. S. standard, but may decline with continued pumping. All other parameters tested fall within recommended limits. Copies of the WMA and Laucks reports are included herein . Conclusions and Recommendations • A shallow aquifer exists from 20 to 137 feet below land surface . -4- I • No suitable aquifer q fer was encountered between 137 and 300 feet . • Though the existence of an aquifer below 300 feet is possible, we believe the probability is sufficiently low that further exploration costs would be better spent at other sites. • • The well is capable of a sustained yield of 1000 gpm using 75% of available drawdown . • The well is capable of long-term yield of 900gpm using 65% of available drawdown . • The long-term pumping water levels will be about 64 feet below land surface at 1000 gpm and about 60 feet below land surface at 900 gpm. I . • The pump should be installed with the intake 82 feet below land surface. • Static water level and pumping water levels should be moni- tored daily for the first two weeks of operation and at least monthly thereafter. I Respectfully submitted, ROBINSON, NOBLE & CARR, INC. F. Michael Krautkramer I I I tJ i ._ \..) '- - I z aort m • Y 13 L1._Ci < .- _ L. { • t' J tj` .' I .' _..... 0 ' O c y v <.O .. ..._. ._. .. _ _. _ V.,fin / ai q .J z \\ Q O� O6 unO. O J Qsr) CJ 3ia� O li>Q]� 0 U 0 • • i'i1L:I Y; -3 • I . _ _.____ _ _ --- .I-- - O I 1 , C7) . , _ . . __ . _ ___ __ _ _ __ . :: . L ! Et ;;•-•••• •1.1.I Cp, j c!J > l� _ __ b 3 Cy �E.,l .. _ • iii p Q a r • • - . ^ W�. _ • b 0 • • • . . %. • r F -t ,J i s l ol�rj i S s' c�+ tlOx1eS, 111C. ! _ t ;, fs r ( zjr. Certificate I a western Acti Seattle) ingtcx7 98104 (206)422-0727 E. e. : .;, Chemistry Mi thialpgy and Technical Services I "" euENT Federal Way Water District 124 LABORATORY NO PO Box 42.9 ?3334 Federal Way, 1,71 98003 DATE April 11, 191 IAttn: Bill Martin REPORT ON WATER SAMPLE INDENURcATfO►l Marked: KCIvD 124 Job No. 78-48C7 Kemper Site 4-09-81 sampled by JBN 0700 TESTS PERFORMED AND RESULTS: Iron, parts per million Less/.005 Man9anese, parts per million . 088 RESPECTFULLY SUBMITTED, ` Laucks Testing Laboratories,Inc..,_ . ate' s-_ This report is submitted for the exclusive use of the rson,partnershi or c or pe p, corporation!o whom it is addressed.S uent use of the name of this company or any member of its staff in connection with the advertising o osale of any product or process will be granted only oe co act.This company accepts no responsibility except• for the due performance of inspection and/or analysis in good faith and acco'ding to the rules of the trade and of science. J ',easeI Print Plainly y1 Yt,A I 1f I at, , - 7 ,rires.._ a a ,��nii�1+:i,i .., Department of Sods!and Health Services JSE tiEAirY PENCIL -� - _3O NOT WRITE IN SHADED AREAS Health Services Division SEE BACK IN PUBLIC HEALTH LABORATORIES FOR INSTRUCTIOl 1409 Smith Tower, B17-9,Seattle,Washington 98104 WATER SAMPLE INFORMATION FOR INORGANIC CHEMICAL ANALYSES a p ,"` 14 i}„,,,, , f C.l s - DATE COLLECTED li,:oz.,-, er . I. ,:,.,,-�., � L r; ` COLLECTED BY: �. /!/! �i'G' -+r-7 2.... sa. rsr.:saa +-wx:. L Telephone: ali't7 - — / /�/ Is this a follow up of a previous out of compliance sample? Yes 0 No LI yes, what was the laboratory number of the previous sample? ST / E I.D.No. SYSTEM NAM ' `( C SYSTEM CLASS COUNTY ��L. 3 (9- (circle one) SAMPLE LOTION WAFTER �`� (92 3 4 A"7 flf THIS SAMPLE TAKEN BEFORE Lam) AFTER L.t IF TAKEN AFTER TREATMENT WAS IT FILTERED FLUORIDATED 1 TR TMENT U T CHECK ONE OF THE ABOVE BOXES _CHLORINATED_WATER SOFTENER:TYPE USED IrCE � — I. SURFACE SOURCE NO. IF SOURCE IS LAKE OR STREAM,ENTER NAME 1F SAMPLE WAS DRAWN FROM DISTRIBUTION SY: 3. WELL —2. SPRING it, WAS COLLECTED FROM SY$TEM AT:(AppR .in —4. PURCHASE _. 5 I. -. 4T $ SEND REPORT TO: (PRINT FULL NAME&ADDRESS) --,.:A;4:.,-i ,6,4.1-1,;.- .<':!'''.4.':- ? :'. V 5_` .'^.,,, 4 ,..;, tx a.+ T s�`..'F. WO4 h"!// / D-✓ t/C {�C J7/J� ! N&ARK$: _ ;Name L[-'ICJ X -,/ PE C%re 4.1d s , 4) { /' Street a_ /DOD P/Yi city pp/L/ 7/7 / up Code - 7�r�C7 Telephone: (pZ4 ///7�— � /t ! ! Area Code LABORATORY REPORT lr-..-,,,....,.„„..,,,„„„.......r-.......-......-.........,„„.....(DO NOT WRITE BELOW THIS LINE) LLSS li STS •MCL THAN RESULTS UNITS Compliance Chemist YES NO Initials LABORATOR e SUPERVISOR enic A: 0.05° • mg/I (Name or MI ' Is) etc -I:2- ♦ -SG._ / mg/I I-' ' �< fG17 t l �r� xtC .mium co 0.01P /D d / • mg/I 111111 Xt C CHAR 3E: :hromium cr 0.05P 10 • 12_ O mg/I ( c Fe 0.3 _____ p • k C G - REMARKS: d Pb D • L_ mg/I K<<+�s7 1 L y _ea 0.05° CC- JOB t 4AME: V c JOB NO._ Inganese Mc 0-05 • �d mg/I • ' K c. LOC.:_ LEE' oe'Z Si%Ll DATE:_H: rcury 149 0.002° • -- :-12- _4/ -....21 ...� mg/I r...--- LC wow.6'Y: r! /3r/ SAMP,NO.:____TIME: I ienium Se 0.01° MI • Q _0 2.3 HRS mg/I -/�LL NOTES'_ & 1°00 ei er Aa 0.05'' • © © / mg/I rin -dium Na _ '© d a mg/I ✓ - let.L rdness Q mg�l ROBINSON,NOBLE AND CARR, INC. _ As Caco3 D E1) GROUND WATER a ENVIRONINEN1AJ GEOLOG caductivity 700 0 • 5- Micromhos/cm 25•C AA _ bldity 1.0° 0 ,f5 . NTU p t A 4 Dior 15.0 Q 2 • Color - 1 I • Units / l.A �oride ` F 2.0° _ • �f) � • � mg/I DC..B trate asN 10.0P -,- 0 • mg/I v a L li- pride c1 250 l (7? / ) E mg/I v D L Male SO4 250 /3 mg/I Project Report: Iron and Manganese Removal for Well 21 Appendix F: Drain Pipe Sizing, Calculation Pipe Sizing for Well 21 Backwash Drain Pipe Assume: Manning Formula for Round Pipe Flowing Full D/4 (D/4)2/3 (S)112 V=(1.49/n)(D/4)213(S)112 0.16675 0.302954 0.070711 A= 3.14D2/4 Try 8 inch Diameter pipe 0.667 D, ft 0.005 Slope, ft/ft Nearly flat 0.013 Manning, n Cement lined, ductile iron Then: V= 2.455 f/s A= 0.349 sf Q=VA 0.86 cf/s 385 gpm Since backwash rate is= 377 gpm Although an 8 inch pipe would work if there were any obstruction it would reduce the pipe capacity so use a 12 inch pipe to provide a safety factor. Project Report: Iron and Manganese Removal for Well 21 Appendix G Historic Water Quality Data 01 0 0 0 N 0 0 O O it O O O O # O O O O In M h O O NO W # 0 O O O a) • O 0112101 1111111111i O O O O 011011E110 tV M O co •N- it 0 O O O 0011110110 O O O Tr O t:t O O O O I 1III2II! .- or)0 0 N.0 0 i IIHI 1 # 0 0 0 0 ONII011010 # o y Z il ZW of0101011010 ; o0 00 W iI- E wpaspummum N o rn co 0 0 0 ZJ c -1 1110. o 0 0 0 O V W Al0101100: mv. ILIW U U E o 0 0 0W w. ~ ` p z 0'11111111ccTi o 0 00 C i'� Q ^ , N M N !EIIII2E # 0000 EN11111111 171 O O O w M T M 0 tD QN N O 0 O O O 0 0 0110101100- EIOIIIII!- O O O O !Hi!I 11 O OoO M O OO� O O O ��11111111 6 o o ,..) � o o � ri � mcotoco EIUhuIE1 - o m 113 waaan OB11011110 :a r N O O O > EEEEdNMNNM M OO Umyyy> co c. a) N a) ar a N N M V N tD N O N M Q Li) I� • if) III E to 0) 0) 0) 0) 0) 0) 0) 0 to 60) 0) 0) 0) 0) O 0) m W Z 005 d 0) 0) 0) 0) co0) 0) Q ) •It, 0) N co 0) 0) 0) a) o N U V d ) - Z Z Project Report: Iron and Manganese Removal for Well 21 Appendix H: Wellhead Protection Area Delineation Map • .k, '••,_1__.-.-_-E_-__l,-,i,/lj 1I 1.,.\7_R„:,4::L).:k-- 1 i ;,L: s\51 / \. ,,s, i l' _jam ' L -_iL-_- -,-I',t\„,2',.,).'-''''-;'-\\t\t\\\g.,1,'' •--0•':'1' \ 1' 7rH T', „ : 3 i` \/ sass'"st .'_ 5 3SBrH 5i ‘, ,, _._- __ % -ter \'‘ ‘ i /i 1 "I:—'l _I r / 1 34oTH rr\ / i! 1-r-- /%-.'` C.tS 1� : it a Z7.-A-;°)1'4-- \'::' \:74")- --t. ''s\ /II'''. \-->'. f' t. k -i,z;,,-/-, — -.-." i€ , 1Pt '. 1� „j \ ! WELLS - 1‘ it___(,:-.....141.5 /)/- 14)16' 11.---4, 1\ I 1 1,, 1=-- _ 11 Ci _4110°Ai t \ e\c_j L=11/ It litSW 34711I „--.4,-.. - ' . L — _ `l% �1 I. SW 3.1% 1 3' �t i, !—J` s SM,H sr I 1 538 ri i \ ii P'%635 6°4*Th•& e350,H R • ` g ARY ''_: :::-::. .;: ; _::- ;:;.. #15AEL1 4 sT ) a4 J 3 OL / —. 1 ' SW 3a3RA Sal }_ / 1 .-SIV11sR11 sr. •+ 1..\ .....Eli:-�}•• ��/ ....zit A1:-H W in ./117 -1-4.4: �sssrH a j �-I12 _s ism sr 0 3 sw men!sr 1 ! s�7 sr -—1 — N8q J " /. iltr:---- co; ' ,� .. �,.> V V 1W xi ST357TH sr ; $ ST " ���C .;1.1.11LJ 1 — II // L j 1 ,,WI 1 -R 1 /i/ 1 JFIAiCEI � s3s,srR BYv_c#5�,,",11I;'1II� ( I SW 363RD R �tolsn -----1I I G I /// r .AJ 1'—�IL sr. i�xro�iq, / ` C,\14- ; 8 I t I a' 1 �1 f // I j j \ I R 1I / , ri 1---.4- t 1 V i \ i ) r/ Kennedy/Jenks Consultants LEGEND N LAKEHAVEN UTILITY DISTRICT WELL 1 ❑ WELL AND IDENTIFICATION1( 10 YEAR CAPTURE ZONE WELL 21 CAPTURE ZONES 5 YEAR CAPTURE ZONE 0 1 8MI. 1 4MI. 1 YEAR CAPTURE ZONE 006090.00\PO 1 SKO 12 Project Report: Iron and Manganese Removal for Well 21 Appendix I: Excerpts from Pre-Design Report: "Iron and Manganese Filtration at Wells 10A, 10C, 17, 17A, 17B, 18, 20A, 21 , & 23A", by Odell Engineering, June 2002 :._ i OUTLET / W/ ELL PUMP / TO WASTE / EXISTING BUILDING EXISTING BASIN TO BE 'r WELL 21 USED FOR `' BACKWASH '' I •111 4Ir f % �1� PIA If II V III 11.P I I � ,� �_ NEW TREATMENT x BUILDING ~: ,, - - .� -� �_ _ �, [1\_. TRANSFORMER 3 3 " :4 � z E- -- TO STREET 20'-0" �NT�go ,y��� IRON & MANGANESE TREATMENT REVIEWED BY: - za � �- SYSTEM FIGURE 39 DESIGN BY: BES�� - gq FOR LAKEHAVEN UTIL • ITY DISTRICT APR'D BY. c rin Inc. c' ,6•�:t�4 WELL 21 - SITE PLAN LHO uite205 ° cam/ DRAWN BY: DT rtr e - 20'-8" 10' 4'-8" 4'-8" 8" L__ Jam - Co 8'-1�8� \� o0 STORAGE VENT 8 C) NEW STE , O FM1TFR ASSEMBUES\ O> UIIJIII I _.,,_ q C__ `` -/8 I rc _____- 7 a, Ill. N C_I L\ ` 4 EXHAUST M WELL PIPING 6'BACKWASH ` DRAIN PIPING HEATER ELEVATION LOOKING NORTH ELEVATION LOOKING SOUTH �� EMETPY MOTOR CONTROL I SWITCHGEARI SCALE:1/4"=1' SCALE:1/4"=1' L J L.___i Li GEN CONNECTOR FLOOR PLAN SCALE:1/4"=1' 12'-6V2" RAW WATER PIPING NEW STEEL / .5112 . / \ FILTER EXHAUST FAN ASSEMBLIES\ BACKWASH \, \ PIPING PAD MID /---NR GAP TRANSFORMER FILTERED • �.. 0 WATER0 I _///��BACKWASH \ / FIN GRID PIPING i _ / ORPAN PIPING /1YP) 7/ � ' S El ELEVATION LOOKING EAST SCALE:1/4"=1' REMOVABLE ROOF SECTION gI N, 0 0 0 PAD MTD l LAKEHAVEN UTILITY DISTRICT TRANSFORMER \ KING COUNTY WASHINGTON ilL_ I II illui iNr a _ I I Well 21 Water Filtration PLAN & ELEVATIONS DATE 5/10/02 SCALE:NOTED ELEVATION LOOKING WEST DRAWN: RSL $ ! SHEET 2 SCALE:1/4"=1' CHECKED: II r � - FILTER WELL 21 PLAN ELEV_RSL_5/10/02 APPR. 1 OF 2 • 61-i11 t r1�1'ilo ''k 11t1 57.1T1: OI- WASItINGION Dr PARTMLN 1 1 ?1 i 11 Al-:1 1 i _ "_nd.As e. S. , Suite 200, k 1,---1_'• krnt- W.tshingNun 1HO J2 -2 713 . 1' jI( October 14, 2002 1 1 MR. STAN FRENCH LAKEHAVEN UTILITY DISTRICT LAKEHAVI_; • PO Box 4249 FEDERAL WAY, WA 98063 Subject: Lakehaven Utility District Water System (ID#41997) King County Predesign Reports for Iron and Manganese Treatment Submittal #02-0610 (Wells 10A, 10C, 17, 17A, 17B, 18, 20A, 21, and 23A) Submittal #02-0806 (Wells 22A and 22B) Dear Mr. French: The predesign reports for the referenced projects received in this office on July 31, 2002 (with subsequent information received on September 26, 2002) have been reviewed and, in accordance with the provisions of WAC 246-290, are hereby APPROVED. Please note that: • If pH adjustment facilities are added to any of the wells where they could affect treatment performance, further investigation will be necessary before final design approval. • Additional design and permitting information on backwash disposal will be required for final design approval. Regulations establishing a schedule of fees for review of planning, engineering, and construction documents have been adopted(WAC 246-290-990). An invoice for$2,653 is enclosed. This fee covers this initial project review and the review of one re-submittal; an additional fee will apply if further review is necessary. Please remit your complete payment in the form of a check or money order within thirty days of the date of this letter to: WDOH, Revenue Section, P.O. Box 1099, Olympia, WA 98507-1099. - Lakehaven Utility District October 14, 2002 Page 2 The approval issued herein is only valid as it relates to current standards outlined in WAC 246- 290, revised April 1999. Future revisions in the rules may be more stringent and require facility modifications or corrective action. Nothing in this approval shall be construed as satisfying other applicable federal, state, or local statutes, ordinances and regulations. If you have any questions or comments, please call me at(253) 395-6764. Sincerely, v James Nilson, PE Regional Engineer N.W. Drinking Water Operations cc: Public Health—Seattle & King County Odell Engineering Odell Engineering N N .• I Lakehaven Utility District N 11111 I IIIPredesign Report for iii III III Iron and Manganese Filtration at Wells 10A, 10C, 17, 17A, 17B, 18, 20A, 21, & 23A 111 June 2002 N 1111 Odell Engineering,Inc. 500 W. Eighth Street,Suite 205 Vancouver,WA 98660 II Phone: (360)699-6631 Fax(360)699-6637 www.lhodell.com M . . . Well 21 Pilot Study Results I 1111 Pilot testing conditions included filter loading rates of 10.31 - 10.91 gpm/sq.ft. Chlorine contact time between injection point and filters was less than 30 seconds for all conditions and media contact time averaged 2.10 minutes as shown on Table 29. 111 Table 29 Summary of Pilot Stud Test Conditions II Lakelix%en Utility"District `i ell 21. January 9.2002 Media Il Average Cumulative Loading Loading Contact Sample Flow Flow Rate Rate Time Cl2 Dose Number Date Time (gpm) (Gallons) (gpm/ft2) (gpm/ft3) (Minutes) (mg/L) I Start 1/9/02 9:00 8.30 = 10.57 3.52 2.13 2.85 1 1/9/02 9:30 8.30 249 10.57 3.52 2.13 2.85 2 1/9/02 10:00 8.20 495 10.44 3.48 2.15 2.17 I 3 1/9/02 10:30_ 8.10 738 10.31 3.44 2.18 1.83 4 1/9/02 11:00 8.40 990 10.70 3.57 2.10 1.76 5 1/9/02 11:30 8.47 1,244 10.78 3.59 2.08 1.75 III 6 1/9/02 12:00 8.55 1,501 2,015 10.89 - 3.63 2.06 1.73 7 1/9/02 12:30 8.57 10.91 3.64 2.06 1.73 8 1/9/02 13:00 8.47 2,523 10.78 3.59 2.08 1.75 I 9 1/9/02 13:30 8.48 3,032 10.80 3.60 2.08 1.75 10 1/9/02 14:00 8.40 3,536 10.70 3.57 2.10 1.76 11 1/9/02, 14:30 8.43 4,042 10.73 3.58 2.09 1.76 ITotal or Average 8.39 4,042 10.69 3.56 2.10 1.97 I Chlorine dosage was between 1.73 mg/L and 2.85 mg/L, free chlorine residual concentrations averaged 1.16 mg/L, and chlorine demand averaged 0.81 mg/L. As shown in Table 30, raw water iron concentrations ranged from 0.003 mg/L to 0.262 mg/L and averaged 0.059 mg/L. I Raw water manganese concentrations ranged from 0.142 to 0.184 mg/L and averaged 0.165 mg/L. Finished water iron concentrations ranged from non-detect to 0.001 mg/L, with removal averaging 99.6%. Finished water manganese concentrations ranged from non-detect to 0.003 I mg/L and removal averaged 99.5%. Manganese removal did not differ with varying chlorine residuals. I Figure 36 shows chlorine dosages and residuals during the test. Figure 37 shows manganese levels tested during the pilot test. Iron concentrations are shown in Figure 38. I 0 II Predesign Report for Iron and Manvnnoce Filtratinn at Lakehaven Utility District Wells 79 It PI ' Table 30 Stmim fr% of Pilot Test Results L;liehla'1 cn utility Distriet 1'ell 21 1111 Januaryci. 2a02 Sample Influent Water Effluent Water Number H2S Fe Mn Cl2 H2S Fe Mn II Start NT 0.026 0.184 1.84 NT - 0.003 1 NT 0.027 0.184 1.87 NT - 0.002 III 2 NT 0.028 0.184 1.29 NT - 0.001 3 NT 0.026 0.178 0.51 NT 0.001 0.001 4 NT 0.026 0.181 1.09 NT 0.001 0.001 1114 5 NT 0.027 0.166 1.09 NT 0.001 0.001 6 NT 0.262 0.159 1.11 NT - - 7 NT 0.251 0.159 1.05 NT - - IN8 NT 0.012 0.149 1.02 NT - - 9 NT 0.009 0.142 1.02 NT - - 11 NT 0.009 ~_ 0.145 1.03 NT - - 11 NT 0.003 0.144 1.02 NT - - Total or Average 0.059 0.165 1.16 0.0003 0.001 NI Average as Percent ofMCL 19.6% 329.2% 0.08% 1.50% Average Removal Rate. 99.58% 99.54% Non Detect,indicating the absence of a metal or chemical at or above the method detection iii III limit is shown as'-and calculated in the total or average as zero. NT=Not Tested 1111 Figure 36 - Chlorine Concentrations for Well 21 3.00 4 250 I 4 _ 2.00 • • • -4--Chlorine Dose 4 1.50 -4--Effluent Water fd 100 } A-A-- • 111 e 0.50 N 0.00 _ T _ 1 2 3 4 5 6 7 8 9 10 11 12 Sample Number N • ., . . Il , Figure 37 g— Manganese Concentrations for Well 21 1111 02 1111 .+ 0.15 .a m a W ra e .2 x —MCL(0.05 rrgrt) v --*-50%pt MCL 0.1 —a--Raw Water 0 0 —.4—Treated Water Y i u to wta a i 10.05 • • • 1111 ■ • • ■ ■ ■ ■ ■ ■ ■ ■ ■ 0 A--A , A ii 1 2 3 4 5 6 7 8 9 10 11 12 Sample Number II Figure 38 — Iron Concentrations for Well 21 II 0.35 II0.3 - is ■ • • ■ • • • ■ s ■ ■ 3 1111 0 0.25 - c - —MCL(0.3 mg/L) c 0.2 - Ir. --•—50% of MCL 111 L. 00 0.15 • ♦ ♦ • ♦ • ♦ • ♦ ♦ • • —e—Raw Water c -. —Treated Water 0 0 0.1 - L. 0.05 - A---di-----A A 0 x , A , x , A , A - Nilsr- 1 2 3 4 5 6 7 8 9 10 11 12 iiSample Number I D..-.1,... n....,._.I:— r.:— -A AA c:r.. ,.. ,.. I-1,-1........, 11.;1;... n:...,.;,.. Wo11c R 1 I . Well 21 Pilot Study Discussion and Conclusions ISamples were tested with loading rates of 10.31 - 10.91 gpm/sq.ft. and chlorine dosages between 1.73 to 2.85 mg/L, resulting in iron and manganese concentrations on average 99.9% and 98.5% I percent, respectively below the MCL. Free chlorine residuals were maintained between 0.51 to 1.87 mg/L. I Eight (8)-48" diameter tanks would be required to treat average flows of 980 gpm under current conditions. Loading rates would be 9.75 gpm/sq.fl. During the backwashing of one filter seven (7)-48" diameter tanks would treat the flow and loading would be approximately 11.15 I gpm/sq.ft. During backwash, a flow rate of 377 gpm for a 3 to 4 minute duration will be needed to backwash one filter at a time, and the remaining 603 gpm of water will enter the system. A complete backwash cycle will be accomplished in about a half an hour. The recommended I chlorine dosage is between 1.5 to 1.8 mg/L. The dosage and loading rates are consistent with the design of other iron and manganese treatment facilities. I Based on the pilot testing results, a full-scale system for average flows up to 980 gpm should be designed to contain 100.48 sq.ft. of filter area and at least 301.44 cu.ft. of media (3.0 feet of media depth). I n Well 21 Basis of Desig n g IOverview I This section outlines the basis of design for iron and manganese removal facilities for the District's Well 21 operations. The project includes installation of manganese dioxide pressure filters, filter media, automatic backwashing system, building enclosure and location of well pump I controls. At this time the District does not plan to build a building to reduce the cost of treatment. The overall proposed site plan for the well facility is shown on Figure 39. A building plan is shown on Figure 40. 11 Filtration Tanks M 'roposed configurations for filtration tanks are included in this section and the estimated costs in g next section. The proposed filtration tank configuration for current well pumping conditions ud's eight (8) tanks, forty-eight inches in diameter rated at a maximum working pressure of .1@�I Nominal system pressure is approximately 142 psi. i .er units will be arranged as shown in Figure 40. The tanks in each filter unit will be s together to provide flow for backwashing. Backwash flow will require z 0. .ly 377 gpm for 3 to 4 minutes per tank. Each manifold will be equipped with an f th e relief valve set at 25 psi above the maximum working pressure. a„ 'i�. 04 and Man PanP_QP Filtrntinn nt InIrvhnvPn Utility fistrirt Wally 8 111 MnO2 media Three feet of MnO2 media will be used within each of the pressure filters, totaling approximately 301 cubic feet of media, providing an empty bed contact time of approximately 2.29 minutes at a flowrate of 983 gpm. The media is rated to remove particulate matter other than manganese and iron to a nominal size of 20 microns. Headloss through the filter is normally limited to 3 psi. Performance and cost estimates in this report are based on using AS-721 media from ATEC Systems and using an ATEC manufactured treatment system. AS-721 is ANSI-NSF standard certified. Automatic Backwash System The automatic backwashing system should be set to monitor both the pressure loss through the filters and the duration of a filtration cycle. The backwashing process should be initiated spontaneously based on one of these two limiting conditions. Backwashing should be performed at 26-30 gpm/ft2, based on the specifications of the filter media. The filters will be manifolded together. The automatic backwash for one filter will use the effluent from non-backwashing filters. A flow meter and control valve will be located on the backwash discharge line of each filter unit to adjust backwash flow. The adsorption capacity of the media is 0.26 lbs./cu.ft. as determined by Odell Engineering with column studies. Based on the pilot testing results, the full-scale facility adsorptive capacity would be met after 30 days of run time. Nevertheless a routine backwash every 12 to 24 hours of run time is recommended for optimum removal. Piping Treated and raw water piping will be 6" coated steel pipe (0.25" thickness). The 4" backwash manifold will be Schedule 80 steel that connects to a 4" schedule 80 steel feeder. We do not anticipate any corrosion problems with the coated steel pipe for raw or treated water conditions. Disinfection To achieve a free chlorine residual of 1.0 mg/L, chlorine will need to be dosed at around 1.7 mg/L. The following table shows maximum daily amount of chlorine needed for the well at different solution concentrations. Approximately 20 pounds/day of chlorine will be needed to treat Well 21 water. Chlorine Concentration(mg/1) Volume of solution(gallons) Lbs/day of chlorine 30,000 80.0 20 60,000 40.0 20 125,000— 12.5% 19.2 20 IlinN J •i__________ c:L—..a:.... ,.s 1,.1.,,G.,...,.. 7/Hlif., Ilicfrin/ WOiIc 83 I. Electrical and Control Electrical power will be required for the building lighting, ventilation and heater, for chlorine pump and for the controllers of the installed filters. The controller uses 1 l0v AC power and draws approximately 0.25 amps. The controller should be energized when the wells are running. Building Enclosure The District will be putting the filters on a concrete pad outdoors to reduce the cost of treatment. However to provide a worst case cost it is assumed that a building will be required to enclose the filtration facility. The building will be 16' by 34' with a ceiling height of 12 feet. The building will be constructed of concrete masonry units adjacent to the existing pump building. The roof will be wood or metal truss with metal roofing. Inlet piping will go into the top of the filters and the effluent piping will go through the floor of the building addition and tee up with the piping that goes into the distribution system If a building is not installed an air compressor will be needed to actuate the backwash valves pneumatically instead of hydraulically to prevent freezing of the lines. The backwash controller and pressure gauges will also need to be protected from freezing. If the district plans on not using the tanks during the winter they should be drained to protect valves and piping. Backwash Water Disposal Backwash water will be infiltrated in an onsite pond. The backwashing will require up to 12,100 (377 gpm x 4 minutes x 8 tanks) gallons of water. The existing pond should be sufficient volume for year round use of the well. The overflow of the pond would need to be blocked to ensure infiltration rather than backwash water running to the stream and/or review discharge to the available sewer line in the street. Well 21 Estimated Costs Planninglevel capital and O&M cost estimates for a new filtration facilityat Well 21 are P presented in Table 31. Cost estimates were developed based on the facility elements described in the previous section. Annual operation and maintenance cost estimates were based upon year round use of the well with 980 gpm capacity and average flow of 980 gpm for 12 hours/day. I I I I Predesign Report for Iron and Manganese Filtration at Lakehaven Utility District Wells 86 . , I I . . . Table 31 111. I'I6.Y n_n LeocI Capital and O&M Costs Estimates(I)for New Treatment Facility at Lakeltaven!fell 21 Capital Cost Estimates Manganese Dioxide Electrical $40,000 SCADA 45,000 Site Work 20,000 Drain and Connection Piping 20,000 1 Foundation 30,000 > lttatign System(includes freight&tlowmeter)—8 48"tanks 95,000 Eder* 75,000 islet t on 115,000 cl Disposal. 40,000 Subtotal $380,000 Sales Tax @8.8% 34,000 Total Construction Cost $414,000 Engineering 20% 83,000 Total Capital Cost $497,000 Annual O&M(2) Electrical Power $6,000 Materials and Supplies 3,000 Chlorine 3,000 Total $12,000 (1) This is a"pre-design"level cost estimate in which the level of precision is plus or minus 25 percent. This estimate does not include construction contingencies. (2) Does not include well pumping. I I I I I 1 1 I Predv_cion Rennrt fnr Irnn and Mnnannv_ce Filtration at Lakehaven Utility District--Wells 87 a KEYNOTES: 34' 0" O RETAIN EXISTING WELL 21 PIPING AND VALVING - EXCEPT AS NOTED O REPLACE 12" x 12" x 8" TEE WITH 12"x 12" x8" x 8" CROSS 0 �I O O 8" GATE VALVE AFTER CROSS 14 rrf LZLLGfLzzza.1_L< +:,:, ��L1% llrz/37G_'1L?T-2,- • / /4 Y 1 �' II i', C) A• TEC 48-48-8 IRON & MANGANESE TREATMENT SYST , O EXISTING BUILDING (8" WALLS) irlii i, 60 4• BACKWASH DISCHARGE LINE THRU FLOOR Zo ®' 8" CHECKVALVE 11 ' Y Li O 12" GATE VALVE (NC) 0 ®�� W r v �r ® iv', 0 O9 CUT INTO EXISTING 12 DIA LINE AND INSTALL ,�� ® 'Oa 12" x 12" x 8"TEE AND 12" GATE VALVE �. i 10 16'-8" x 34' BUILDING ADDITION (8" WALLS) — — — — +— — — Z ' 0 - i ' S 11 R• EMOVE DOUBLE DOORS FOR MANWAY , , [ E ® CHLORINEROOM' I _ i M e DOUBLE DOORS \ N 0 'I- 13 ( I �l — ii 20'-6" 4 0 8 16 IMINIMMI SCALE IN FEET NOTE: CHECK SCALE SCALEABLE IN 11x17- 1/8"= 1-0" REVIEWED BY: - �N'��o� IRON & MANGANESE TREATMENT SYSTEM DESIGN BY: BES . �, 0/_1( FOR LAKEHAVEN UTILITY DISTRICT FIGURE 40 APR'DBY: LHO Odell Engineering, � ' � 6 WELL 21 — BUILDING PLAN , -s. St.,Suite dDRAWN BY: DT Vancouver,Wa.9866 '°s�,tc„r=Nes�so -- Ph.(360)699 6631 sroN�L DATE: 05.22.02 FILE: Fax(360)699-6637 — I IIXRl! lF—N— e' Or FEDERAL WAY, WASHINGTON sHT 1 OF 1 �'own No. Cl Project Report: Iron and Manganese Removal for Well 21 Appendix J: ATEC Iron and Manganese Removal System, Technical Specifications II . X Ili am ATEC IRON AND MANGANESE REMOVAL SYSTEM 2 TECHNICAL SPECIFICATIONS II 3 October 3, 2002 II4 5 NOTES I 6 These specifications cover a standard module of the ATEC Iron and Manganese Removal System 7 that ATEC Systems proposes to provide to Lakehaven Utility District to treat well water at several 8 wells owned and operated by the District(Well Nos. 20, 20-A, 21,23, and 23-A. The performance 9 guaranty contained herein is based on pilot tests conducted by ATEC Systems for the District at II 10 various times in 2001 and early 2002 and assumes that the production level and source water 11 quality will remain substantially constant. 12 The normal operating pressure of the proposed system will not exceed 150 psig. The treatment is 13 system modules shall consist of shall consist of 4 each 48-inch diameter filters with 48-inch 14 sidewalls. The filter vessels are to be skid mounted on 4" x 6" heavy wall steel tubing. All 15 materials used in the manufacture of this system will conform to the specifications contained 16 herein. Each filter shall contain 36"of AS-721 Filter Media. II 17 1. FILTER TANKS 18 Tanks shall be of electric welded pressure vessel quality low carbon steel construction II 19 rated for 150 psig working pressure and hydrostatically tested at 100%in excess of the 20 working pressure. Sidewalks shall be built of Grade A-572 steel and tank heads and 21 hand-holes shall comply with ASME Code requirements. Sidewalls shall be at least%" I22 gauge and heads shall be at least%"gauge. 23 Tanks shall have stainless steel grooved coupling connections on the service inlet and 24 outlet Manifolds shall have a flanged connection on the system inlet and outlet. I 25 Access opening for tanks shall indude one 11" x 15" manhole in the top head one 8" 26 circular access ports in lower sidewall of tank as dose to lower head as I27 under drain servicing or media removal, possible to allow for 28 Support for tanks shall be structural steel angle iron legs welded to lower section of the 29 sidewall. 1 30 Four filter vessels shall be mounted to a common 4" x " + " tubular steel frame 31 (skid) with forklift brackets and four crane lifting hooks. The skid will be sandblasted 32 and epoxy coated. There will be sixteen 2"x 4"x%"stainless steel plates mounted on I 33 the underside of the each skid to maintain a separation between the skid and the 34 concrete floor of at least 0.125 inches. I35 36 This treatment system shall consist of one skid with four each 48" diameter filters with 48"sidewalls. Filter vessels shall be mounted so that they can be removed individually 37 with the use of standard hand tools and a forklift or similar lifting device. I38 39 Gussets with oversized 1"bolt holes shall be provided at each inside corner of the skid to allow the system's attachment to the floor by anchor bolts. I ATEC Systems Technical Specifications Lakehaven Utility District, Standard Iron and Manganese Removal Module 11 October 3,2002 Page 1 of 5 I Of 1 2. COATINGS 111 2 Immersed steel surfaces on tanks of all diameters shall be sand blasted to a near 3 white metal surface finish per(SSPC-SP10)finish. Non-immersed steel surfaces shall 4 be Commercial Blast Cleaned as per SSPC-SP6. 5 All filter vessel immersion service surfaces shall be coated with Tnemec, Inc. Series 20 iii 6 Pota-Pox,a two part epoxy polyamide system or equal,Certified to ANSI/NSF Standard 61, 7 applied in accordance with the manufacturer's recommendations, except as specified 8 herein. Total dry film thickness(DFT)of immersion service coatings shall be at least twelve 111 9 mils, applied in two or more coats. Coatings on all surfaces coated for immersion service 10 shall be force cured. Immersed surfaces shall be force cured per manufacturer's 11 recommendations. II12 Manifold immersion surfaces shall be coated with 3M Corporation ScotchKote 134, an 13 epoxy fusion coating which conforms to the requirements of ANSI/NSF Standard 61 for 14 contact with potable water and the requirements of AW NA Standards C550 and C213. IIII15 The exterior finish shall be applied in at least two coats and may be achieved in more than 16 two coats. Exterior surfaces will be coated by a primer coat and application by applying a 2- 17 3 mil DFT coat of a rust resistant primer and 2-3 mils DFT of Tnemec, Inc. Series 1075, 111 18 Endura-Shield II or equivalent 19 3. INTERNAL DISTRIBUTION 11 20 The filter system shall be a"down-flow" type with untreated water entering the top of 21 the filter and flow through the filter tank and out the bottom of the tank. an IIII 22 The upper distribution system shall be of the baffle type to evenly distribute the water over 23 the entire tank area. II 24 The lower distribution system shall be of a proven design to provide a uniform 25 backwash flow across all of the filter media. For 48-inch diameter filters, the under 26 drain will be constructed with ten individual stainless steel wedge wire radial outlets 27 with openings of not more than 0.010". The radial arms are secured to a stainless II 28 steel hub-base by nipples threaded into stainless steel pipe couplings welded to the 29 hub. Each radial arm shall have adequate outlet orifices for the stated flow located 30 beneath the wedge wire (the specific design requirement is that each arm be capable 0 31 of handling 37.5 gpm of water with a pressure loss not to exceed 2 psig). The 32 distribution system shall be embedded in a single layer sub-fill of 3/8" x 3/4" washed 33 gravel to support the filter bed. in PO 34 4. MAIN OPERATING VALVE 35 The main operating valve on each tank shall be an industrial automatic multi-port 11 36 diaphragm type, slow opening and closing, free of water hammer.. The diaphragm 37 assembly shall be fully guided on its perimeter when pressure activated from one 38 position to another to assure a smooth reliable shut-off without sticking. There shall be six 39 no contact of dissimilar metals within the valve and no special tools shall be required to 111 40 service the valve. The valve shall be capable of being operated pneumatically. The 41 operating pressure shall be equal to the filter system inlet pressure. 111 Systems TechnicalSpecifications ATEC 111 Lakehaven Utility District, Standard Iron and Manganese Removal Module October 3,2002 Page 2 of 5 II 1 5. PIPE AND FITTINGS II 2 Raw and treated water manifold and piping shall be 6" Schedule 40 steel with a wall 3 4 thickness of 0.25" or greater. Backwash piping shall be Schedule 40 steel unless otherwise specified. Immersed portions of manifolds shall be coated with a fusion 5 epoxy coating, certified to ANSI/NSF Standard 61 in the same manner specified for II 6 fitter vessels in Section 2, above except that manifolds with diameters smaller than 3" 7 shall be made of Type 316L stainless steel and left uncoated. 1111 8 A 2"threaded connection shall be provided on the inlet manifold for owner mounting of 9 an air relief valve. 10 6. FLOW CONTROL 1111 11 An adjustable backwash flow restri 12 ctor,to assure proper backwashing, is provided with each system. Backwash flow will be provided internally to the system (i.e. no 11111 13 additional flow from the well or distribution system shall be used during backwash). 14 Proper filter bed fluidization during backwashingshall be 15 uired. Backwash flow rates shall be made at system start-up.An approved backwash flow meter will monitor 16 backwash flow. I17 7. CONTROLS I 18 A factory-mounted and wired cycle controller shall incorporate corporate an adjustable time_ switch with multi-ported pilot valves to control all steps of automatic backwash. 20 Provision for push button initiated-backwash shall be included, as will provisions to 21 accommodate remote initiation of backwash. The controller is by a 120 VAC I 22 connection with a local panel indication of backwash status and alarm. 23 The multi-ported pilot control valve shall be pre-connected to automaticall y y pressure activate the operating control valve through the steps of backwash and return to I 25 service. The control panel shall indicate the cycle of operation at all times. In case of 26 power failure, a complete backwash cycle can be performed by manual operation of 27 the pilot control valve. I28 Electrical lockouts to prevent more than one unit from backwashin at the same 29 except when the system is manually overridden are included. g time, I30 Electrical time switch control shall be fully adjustable to initiate backwash at regular 31 frequencies from hourly to once every 48 hours and at a set pressure differential. The 32 capability for backwash, initiated from a remote location, by an electrical signaling I33 device shall be included. 34 8. AS 721 FILTER MEDIA I35 36 The filter media shall be a granular material having both oxidizing and catalytic properties for iron and manganese removal. The size of the media shall be 8-to-20 U. S. Mesh. The 37 media is NSF Certified to ANSI/NSF Standard 61. I38 The media shall operate on in a pH range of 6.0 to 10.0. I ATEC Systems Technical Specifications Lakehaven Utility District, Standard Iron and Manganese Removal Module October 3,2002 Page 3 of 5 I II I1 Iron and manganese shall be removed to a level below one half of the established 2 maximum contaminant level (MCL). Particle retention shall be twenty (20) micron and 111 3 larger for particles other than iron and manganese. 4 9. PRESSURE REUEF VALVE 11 5 A six inch flange shall be provided on a to-be-determined location on the inlet manifold for 6 the installation of an appropriately sized pressure relief valve by the owner. N 7 10. REGENERATION SYSTEM 8 Media regeneration is not required. Chlorine is the oxidant that will be used on this system 9 and a free chlorine residual equal to or greater than 0.4 mg/L shall be maintained in the 1111 10 product water leaving the treatment unit. No oxidant other than chlorine is authorized for 11 use in this system. 111 12 11. ACCESSORIES 13 Liquid filled pressure gauges of%%full scale accuracy in corrosion resistant frames shall 14 be provided(0-160 psig)for inlet and outlet manifold of the system. Gauges shall be 4%"in 111 15 diameter and will be mounted above the control panel. 16 Sampling ports will be provided for finished water from each filter vessel as well as II 17 composite sampling ports for raw and finished water as well as for backwash effluent. 18 Two '/." threaded half couplings will be provided on the inlet and outlet manifold for 19 such use as the customer may deem appropriate. These will be plugged at time of Ill20 delivery. 21 1Z INSTRUCTIONS III22 Six complete sets of ATEC Systems' Installation. Operating and Maintenance Manual 23 are included with the treatment system. The 0 & M manual includes schematics of to 24 electrical controls. 11111 25 13. FIELD SERVICE ill 26 The services of a factory authorized service representative shall be made available to 27 supervise, inspect and provide operator training initial start-up and as required for system 28 operation for up to two days time. III29 14. GUARANTEES 30 ATEC Systems guarantees all equipment, coatings, valves, and controls for three (3) 1111 31 years against defects in workmanship or materials. Any part proving defective will be 32 replaced or repaired, at our option, within this period in accordance with our standard 33 guarantee. II 34 The manufacturer guarantees that, under actual operating conditions: (1) the media shall 35 not be washed out of the system during the service run or badkwashing period;and, (2)the 36 under drain system, gravel and media shall not become fouled, either with turbidity or by III37 other particles,while operating as specified by the manufacturer. ATEC Systems Technical Specifications 1111 Lakehaven Utility District, Standard Iron and Manganese Removal Module October 3,2002 Page 4 of 5 I,///: 1 The manufacturer further guarantees that (1) iron and manganese will be removed at 2 all times except during and immediately following the backwash cycle for a period not ' 3 to exceed five (5) minutes to a content level of 50% or less of the current secondary 4 MCL of 0.3 and 0.05 mg/L, respectively; (2) that filtered water turbidity shall be less 5 than 1.0 NTU; and, (3) that filtered water color shall be less than 5 standard color 6 units. These levels will maintain with no more than two backwash cycles per 24-hour 7 period under normal operating conditions. 8 This performance guaranty is predicated on operation of the system as specified in the 9 Owner's Manual. Failure to operate the system in accordance with the Owner's ' 10 11 Manual can result in the destruction of the filter media and failure of the system to remove iron and manganese from the water supply. Should system performance fail 12 because proper operating procedures, particularly those related to backwashing and ' 13 maintaining free chlorine residuals, are not followed ATEC Systems Associates, Inc. 14 and/or ATEC Systems, Inc. shall be relieved of all liability as to performance. 15 15. OTHER DOCUMENTS 16 Drawings of the proposed system are enclosed and are incorporated into this 17 specification by reference. �� 1 1 1 r 1 t r ATEC Systems Technical Specifications Lakehaven Utility District, Standard Iron and Manganese Removal Module October 3,2002 Page 5 of 5 I 4 III Y I I , • F 11 A 4II 111111 I w K0 oi. , _.. ni, iti ,..., , .._ , , , Al 0 KO 0 J_ i1. /11 , ii}j(flO L:ELA'*------I 1 1 11,111 w 'i ww f Ylr • N IN VI 2§ ...a i m AQQA II ZZ liti li 0 �a 0 N1 II- - , ;WU .11:,.. 1 1 Tian NI\ • - a 1,AINIF/:, liZM -,,,'c' - O Q 1 e 111 O O 1 OZ ems..... ... zl a. Zm 3 IS D SI 3 ig 50) °I ili1111111111 1733 0 , E " mlvl 11111111 ; ii s m IJIP'9ii II 3 ii ;o p 8 i s as m In C' .I ATEC MODEL48-48-04(IN LINE)500GPM r C IRON&MANGANESE REMOVAL SYSTEM ATEC SYSTEMS FOR LAKEHAVEN WATER DISTRICT PLAN,ELEVATION 500 WEST IITH ST..SUITE 205.VANCOUVER,WA TYPICAL SYSTEM CONFIGURATION DETAILS Ph.( )6934202 FAX(380)397°37s I • Project Report: Iron and Manganese Removal for Well 21 Appendix K: Filter Design Worksheet, Calculations • Filter Design Worksheet Flow per Filter(gpm) Diameter Area Loading Rate(gpm/sf) (in) (sq.ft) 9 10 11 12 30 4.91 44.16 49.06 53.97 58.88 36 7.07 63.59 70.65 77.72 84.78 48 12.56 113.04 125.60 138.16 150.72 Design Rate for Filter will be 1000 gpm 60 19.63 176.63 196.25 215.88 235.50 Select 1000 gpm Filter Selection-number of filters Diameter Loading Rate(gpm/sf) Pilot Loading Rate= 10.31-10.91 gpm/sf (in) 9 10 11 12 30 22.65 20.38 18.53 16.99 Select 48 Inch Dia 36 15.73 14.15 12.87 11.80 Select 8 Filters 48 8.85 7.96 7.24 6.63 Actual 9.95 gpm/sf 60 5.66 5.10 4.63 4.25 Filter Back Wash Rate(gpm) Diameter Area Back Wash Rate(gpm/sf) (in) (sq.ft) 25 30 35 30 4.91 123 147 172 36 7.07 177 212 247 Pilot Study Recommendation: 48 12.56 314 377 440 Use 30 gpm/sf 60 19.63 491 589 687 Results in 377 gpm Filter Back Wash Volume(gal): Assumed 30 gpm/sf Diameter Area Back Wash Rate Duration(min) (in) (sq.ft) 2 3 4 5 30 4.91 294 442 589 736 36 7.07 424 636 848 1060 Pilot Study Recommendation: 48 12.56 754 1130 1507 1884 Use 4 min 60 19.63 1178 1766 2355 2944 Results in 1507 gal Back Wash Frequency: Estimated Loading from Pilot Study Actual Loading Capacity(all filters) Pre Post* Est. Loading Rates 1.44 MG/d Effective Media Depth mg/I mg/I mg/I Ib/MGD lb/cf/day Use 1 ft Iron 0.059 0 0.059 0.49 0.0071 Effective Media 100.48 cf Mn 0.165 0 0.165 1.38 0.0197 Filter Loading Limit: Total 0.224 0 0.224 1.87 0.0268 Assume 0.26 lb/cf *assuming full removal Time Between Back Washing: Result= 9.71 days Assume= 2 days/filter With 8 filters- One filter every= 6 hour will provide a 300+%safety factor The water generated by this filter system will yield= 6029 gallons per day Well 21 DOH Project Report Project Report: Iron and Manganese Removal for Well 21 Appendix L: Estimated Backwash Water Quality, Calculations Well 21 Estimated Backwash Water Quality Assumptions: Raw water Mean Mn= 0.1650 mg/I )from Predesign Report for Iron and Manganese Filtration Raw water Mean Fe= 0.0590 mg/I )at Wells 17, 17A and 17B,by Odell Engineering, Inc,2004 Backwash every 48 hours Backwash rate= 377 gpm Production rate plus recycle flow= 2720 gpm Backwash duration= 4 minutes Removal of filters= 100% Removal by Sedimentation tank= 90% Specific gravity of: Mn compounds range(4-5)use 4.5 density 281 lbs/cf Fe compounds range(5-6)use 5.5 density 343 lbs/cf Water to infiltration pond goals: Mn compounds between 0.2-10.0 mg/I Conversion factors Fe compounds between 5.0-20.0 mg/I 3.785 I/gal Chlorine <1.0 mg/I 0.4536 kg/lb Estimated Est.Settling Recycle Raw Water Backwash Tank Removal Water Volume gaVday 1440000 1507 0 6029 Mn Concentration mg/I 0.1650 157.643 90% 16.069 lbs/gal 1.3761E-06 1.315E-03 1.340E-04 Mn Mass lbs/day 1.982 1.982 0.202 Mn Volume cf/yr 2.576 2.576 0.263 Iron Concentration mg/I 0.0590 56.369 90% 5.746 lbs/gal 4.9206E-07 4.70E-04 4.79E-05 Iron Mass lbs/day 0.709 0.709 0.072 Iron Volume cf/yr 0.754 0.754 0.077 Total Concentration of Fe and Mn mg/I 0.224 214.013 90% 21.815 Ibs//gal 1.86816E-06 1.78E-03 1.82E-04 Total Mass of Fe and Mn lbs/day 2.690 2.690 0.274 lbs/yr 981.90 981.90 100.09 Total Volume of Fe and Mn cf/yr 3.329 3.329 0.339 cy/yr 0.123 0.123 0.013 Well 21 DOH Project Report Est Backwash Water Quality Project Report: Iron and Manganese Removal for Well 21 Appendix M: Settling Velocities, Calculations Settling Velocity using Stoke's Law: v = g(ps-pw)d2/18µ v= Settling Velocity(f/s) g= Acceleration of Gravity(f/s2) ps= Density of Particle(lb-s`ff) Pw= Density of Water(lb-s`/f)@ 60°F d= Diameter of Particle(f) µ= Absolute Viscosity of Water(lb-s/f2) SG= Specific Gravity=ps/pH, Atomic Approx. Text Book Table Calculated Formula Weights/Density Weights SG Density(g/cm3) SG Water,H2O 18.02 1.000 1.000 at 4°C Iron Hydroxide(II),Fe(OH)2 89.86 4.987 Not given,but more dense than Manganese Iron Hydroxide,Fe(OH)3 106.87 5.931 Not given,but more dense than Manganese Manganese Oxide(IV),MnO2 86.94 4.825 5.118 at 25°C 5.118 Manganese Oxide(II),MnO 70.94 3.937 5.370 at 23°C Typical Precipitants will be Fe(OH)3 and MnO2 Since Manganese Oxide(IV),MnO2 is the primary component being filtered,and the least dense, the density of this constituent will be used in the settling velocity calculation. Assume the density of this constituent(given at 25°C)is the same at 4°C(given for water). Conservatively Assume,SG= 5.000 pw= 1.936 = Density of Water(lb-s`/f`)@ 50°F then SG x pw=ps 5.000 1.936 ps= 9.680 = Density of Particle(Ib-s2/f4) Typically the precipitants in the backwash range from 1-20 microns in size. Conservatively assume, d= 3 microns or 9.8E-06 f,or feet and g= 32.2 = Acceleration of Gravity(f/s2) µ= 2.735E-05 = Absolute Viscosity of Water(lb-s/f2) Thence, v= 4.907E-05 (f/s) Proposed Sediment Vault or 0.00294 (f/min) Water Depth: 0.1766 (f/hr) 2.12 (in/hr) 96 in 4.24 (f/day) 50.87 (in/day) OK Removal in 24 hrs Backwash Particle Size Distribution and Removal Estimate Typical Diameter Unit Volume Typical Total Size Range per Particle Count Volume %by (in microns) (microns') (microns') Volume 0 to 2 4 8200 34348 2% 2to 3 14 8000 113097 8% 3to 4 34 4000 134041 9% 9% 4to 10 524 750 392699 27% 27% 10 to 15 1767 200 353429 24% 24% 15 to 20 4189 100 418879 29% 29% Total 1446494 90% Volume of a Sphere:V=(4*Pi()/3)*r^3 or(PIO/6)*d^3 Assuming the density of the particles are constant,then the mass of the particles are directly proportional to their volume. mass=density lb/cf x Volume cf For removal,assume all particle greater than 3.0 microns are removed or 90%. Project Report: Iron and Manganese Removal for Well 21 Appendix N: Infiltration Pond Sizing, Calculation V k E . 2 & ku) 5' a) n E $ E ^ CD V) "0 76 n ■ U) � 2ok o � q � . ■ c a(01 s a) 2f t 0 �7 g2 om § % 2 7 5 k % k (u -5 13 m so E o) " o k o l a) & � � f02 / r » m $ � iii 2 � w = o a 0 m Q. c c 0 -Q % %.VOtt � / m � - CN1 a) o 2 J c > .E o 2 w m m o © � — 0 _a a / ° N- 2 , .2 C) E c § m k � � cu ) E k_ — 4_ / / o — 2 2 k a.. cu o = a q Cr) o - C) 0 E� E � � � � A ■ co Co f k _C c c m @ @ k § � - 0 o co a \ o (Ni co a W IIus f •f / § 2 � a) o ■ o 2 o > >,5 \ 0_ o_ m ■ .E e \ c 0 2 0 % ƒ g o a Q E o C & CT) Z i CO 8 c 3 : / / R ƒ f 2 2 m V 0 m Ela: g U) 0) C ■ 0 � � f_ 2 § _1 _£ f .2 CI 20 2 k � co / 0 0 [ o 2 fE . o o a f o et J 2 0 0 3 m@ = . R a cu 2 m N co ■ ■ » ■ m @ _ E 2 o o c @ -c u) e N � � tk ° w � Lkkkk �:•c 0 flI ° > a 2 \ qmi 5 E E - m _ = / E \ I- U. � <m m m Z I- k U- I- Project Report: Iron and Manganese Removal for Well 21 Appendix 0: Design Drawings (small), See Full Scale Drawings Project Report: Iron and Manganese Removal for Well 21 Appendix P: Operations and Maintenance Manual OPERATIONS AND MAINTENANCE MANUAL A TEC IRON AND MANGANESE REMOVAL SYSTEM Model 48-36-08 q�1 LAKEHAVEN UTILITY DISTRICT Well 21 Treatment Facility King County, Washington June 2005 • ATEC SYSTEMS TREATMENT SYSTEM SUMMARY TABLE Lakehaven Utility District,Well 21 Water Treatment Facility,Iron and Manganese Removal June 2005 Comments and Notes Raw Water Quality(from pilot tests) Iron(mg/L) ±0.003—0.262 Pilot Plant Study and Preliminary Design Report Manganese(mg/L) ±0.142—0.184 Hydrogen Sulfide(mg/L) Not tested for Ammonia(mg/L) Not tested for Treated Water Quality Objective(from pilot test) Iron(mg/L) <0.02 Manganese(mg/L) <0.02 Hydrogen Sulfide(mg/L) N/A Goal is not detectable Ammonia(mg/L) N/A Free Chlorine Residual(mg/L) n0.50 Design Parameters System Operating Pressure(psig,working) ±105 Maximum pressure/150 psig Well Production(gpm) 1000 No.of Filter Vessels 8 Filter Vessel Diameter(inches) 48 • Filter Surface Area(1 filter)(square feet) 12.56 Side Wall Height(inches) 48 Media AS-741 Media Depth(inches) 36 Media Volume(1 filter)(cubic feet 37.5 Maximum Application Rate(gpm/ft`) 10 Do not exceed except during backwash. Recommended Initial CIZ Dose(mg/L) 1.5 This is a critical variable. Free Residual CIZ Target(mg/L) 0.4-0.7 This is critical and is the minimum residual required. Estimated Backwash Frequency(per Vessel) 24-48 hours Based on production time. Recommended Initial Backwash Duration 3-4 minutes/vessel May require adjustment. Required Backwash Rate(gpm/ft2) 26-to-30 This variable is a critical variable. Required Backwash Flow-rate(gpm) 327-to-377 This is a critical variable. Other System Characteristics Controller Alex-Tronix Model F-8 AC/DC/DCL(115 VAC input to low voltage transformer) Control Valves Bermad BBWV-3x3x2(Series 350) Solenoid Valve(Peter Paul Electronics Co.) PN 73Z0157LCM 24 VAC(from controller transformer) Pressure Sustaining Valve(if any) Bermad Provided by others Backwash Flow rate Control Valve 3"Gate Valve NIBCO Coating System,Immersed Surfaces Tnemec Pota-Pox 20 Force Cured. Coating System,Manifold Immersed Surfaces 3-M Corp., Fusion Epoxy Coating. ScotchKote 134 Coating System,Exterior Base Coat Tnemec Pota-Pox 20 Force Cured. Top Coat Tnemec Endura-Shield II Baby Blue 1074-B4338, Series 1074 True Blue 1074-B4339 Filter Weight(Ibs)(empty) 1,500 Media Weight(Ibs)(per vessel) 10,530 Weight of Water when Operating(Ibs) 3,700 Total Filter Weight(Ibs) 15,730 Repair Parts--All ATEC Systems Associates,Inc.,500 West 8`"St., 360-693-6202 Repair parts ordered by noon are Street,Suite 205,Vancouver,WA 98660 360-901-2273 normally shipped the same day. —ALERT— PROPER CHLORINE DOSING IS ESSENTIAL TO PROPER SYSTEM OPERATION PROPER BACKWASHING IS CRITICAL TO EFFECTIVE REMOVAL atec systems Operations and Maintenance Manual TABLE OF CONTENTS Section Page SECTION I, SUMMARY OF TREATMENT SYSTEM CHARACTERISTICS 1 SYSTEM DESCRIPTION 1 ATEC IRON AND MANGANESE REMOVAL PROCESS 1 Removal Mechanisms 1 ATEC High-Rate Iron and Manganese Removal 2 Application Rates 2 Backwashing to Maintain Removal Characteristics 2 HOW ATEC FILTERS BACKWASH 3 Backwash Variables 3 Backwash Frequency 3 Backwash Flow Rate 3 Duration of Backwash 4 Time/Pressure Differential Backup 4 Integration with SCADA Systems 5 SPECIAL REQUIREMENTS 5 Supplementing Backwash Water Supply 5 Use of Normally Open/Normally Closed Valves in Backwash 5 Pressure Sustaining Valves 5 Air Actuated Backwash Valves 6 SECTION II, INSTALLATION 7 Unloading the Filters 7 Skid Mounted 7 Not Skid Mounted 7 Safety Precautions 7 Locating the Filters 7 Installing the Filters 8 Leveling and Aligning the Filters 8 Supply and Discharge Piping Connections 8 Backwash Piping Connections 9 Electrical Connections 9 Securing Filters to Foundation 9 Touch-Up Paint 9 Loading the Media 10 OTHER CONSIDERATIONS 10 Importance of Air Gap or BPD for Backwash Lines 10 Sample Ports 10 Air Relief Valves 10 Pressure Relief Valves 11 Sand Separators 11 atec systems Operations and Maintenance Manual ..�_ nnnc TABLE OF CONTENTS (Continued) Section Page SECTION HI, INITIAL START-UP 12 Filling and Disinfecting the Filters and Media Prior to Initial Start-up 12 Things to Check Before Starting the System 12 Purging Air from the System 12 Cleaning the Filter Media and Setting Backwash Flow Rates 12 Chlorine Dose during Start-Up Backwash 13 Readying the Treatment System for Operation 13 SECTION IV, OPERATING THE ATEC IRON AND MANGANESE REMOVAL SYSTEM 14 Application Rates 14 Setting Chlorine Level in Product Water 14 Setting Backwash Parameters 14 Monitor Pressure Loss 14 Sample Ports and Water Quality Testing 14 SHUT DOWN PROCEDURE 15 START-UP AFTER PROLONGED OUT-OF-SERVICE 15 MAINTENANCE 15 Controller 15 Backwash Control Valves 15 Solenoid Valves 15 Backwash Restrictor Valves 15 Lines and Valves 16 Site Tubes 16 Media and Checking Media Levels 16 Paint 16 TROUBLE SHOOTING 16 EQUIPMENT FOR ON-SITE ANALYSIS OF WATER QUALITY AND RELATED PARAMETERS 18 REPAIR PARTS 18 atec systems iv Operations and Maintenance Manual LIST OF APPENDICES Section Page APPENDIX A, ATEC IRON AND MANGANESE REMOVAL SYSTEM SPECIFICATIONS AND DRAWING OF EQUIPMENT PROVIDED A-1 Plan, Elevation & Details, ATEC MODEL 48-36-08 ATEC Iron and Manganese Removal System, Technical Specifications, December 15, 2001 APPENDIX B, NSF CERTIFICATION FOR ATEC SYSTEMS FILTER MEDIA B-1 APPENDIX C, TNEMEC COATING SYSTEM TECHNICAL DATA AND MATERIAL SAFETY DATA SHEET C-1 Tnemec Pota-Pox Series 20, Technical Data Tnemec Pota-Pox Series 20, Material Safety Data Sheet Tnemec Endura-Shield Series 1074, Technical Data Tnemec Endura-Shield Series 1074, Material Safety Data Sheet 3-M Corp., ScotchKote 134 Technical and Application Data APPENDIX D, ALEX-TRONIX MODEL CONTROLLER OWNER'S MANUAL D-1 APPENDIX E, BACHWASH CONTROL VALVE DATA E-1 APPENDIX F, SOLENOID DRAWING AND INSTRUCTIONS F-1 APPENDIX G, BACKWASH FLOWMETER SPECIFICATIONS AND DRAWINGS G-1 APPENDIX H, ATEC SYSTEMS LIMITED WARRANTY H-1 atec systems v Operations and Maintenance Manual Section I DESCRIPTION OF SYSTEM OPERATION This section describes the basic system operation for the high rate iron and manganese removal system at Lakehaven Utility District's Well 29 Water Treatment Facility, in King County, Washington. The system consists of eight 48" diameter filters with 48" sidewalls, each containing 36" of AS-741 Filter Media. SYSTEM DESCRIPTION The ATEC Iron and Manganese Removal System ' is an in-line, pressure filter system that uses ATEC Systems 721 or 741 Filter Mediae, a granular manganese dioxide (MnO2) with a pyrolusite base, as the filtration media. The typical system contains three to twelve filter vessels with common inlet and outlet manifolds. The media-bed usually consists of a single 36"-to-48" layer of ATEC Systems 721 or 741 Filter Media. In this case, the filter bed consists of 36" of AS-741 Filter Media. An anthracite cap is not used over the filter media. The use of a mono-media filter bed, combined with the physical properties of the media, simplifies backwash operation, eliminating the need for the use of air in the backwash process. ATEC IRON AND MANGANESE REMOVAL PROCESS Iron and manganese are relatively abundant in the earth's crust and find their way into many ground and surface water supplies. These metals can result in discolored water, growth of autotrophic bacteria called ctenophores, increase chlorine demand, tubercle formation and taste and odors in potable water supplies. Removal Mechanisms Two of the most commonly used removal mechanisms for iron and manganese removal include: • Oxidation, precipitation and filtration, and • Adsorption. Iron and manganese found in groundwater systems are predominantly found in their reduced forms: ferrous iron (Fe2+) and manganous manganese (Mn2+). Oxidation of these reduced forms results in formation of ferric iron (Fe3+)and manganic manganese (Mn4+)sometimes Mn3+ is formed as well. Adsorption removal mechanisms sorb dissolved iron and manganese onto manganese dioxide and has also been reported to act as an oxidizing contact medium and filtration medium. Adsorption kinetics are much faster than oxidation kinetics. In laboratory tests performed by Knocke (1990) manganese concentrations of up to 1.0 mg/L found most uptake occurred in the top 6 inches of the media. This finding was also repeated in full-scale plants at Durham N.C. Knocke's (1991) later findings included: 1. The sorption of Mn (II) by MnOx(s)-coated filter media is very rapid. Both sorption kinetics and sorption capacity increase with increasing pH or surface MnOx concentration. 2. In the absence of a filter-applied oxidant, Mn (II) removal is by adsorption alone. Patent pending. 2 ATEC Systems 721 and 741 Filter Media is Certified by NSF to ANSI/NSF Standard 61. atec systems 1 Operations and Maintenance Manual 3. When free chlorine is present, the oxide surface is continually regenerated, promoting efficient Mn (II) removal over extended periods of time. Media used for adsorption includes pyrolusite, the material from which AS-721 and AS-741 Filter Media are derived. To maintain efficient uptake kinetics, a continuous application of chlorine adequate to yield a free chlorine residual in the range of in the range of 0.4 to 1.0 mg/L in the product water is provided as a continuous regenerant. ATEC High-Rate Iron and Manganese Removal Iron and manganese are removed by adsorbing partially the reduced forms of the compound onto AS-741 Filter Media. This process differs from most iron and manganese removal processes in that iron and manganese are purposely not precipitated during the process. By avoiding precipitation, loading rates of 8- to 16- gpm/ft2 are commonly achieved. In order to optimize and maintain removal, chlorine is used to maintain the media in a highly oxidized state. Chlorine is introduced into the water supply at the wellhead or other injection point immediately before the water enters the filters at a level adequate to maintain a free chlorine residual in the treated water. If iron or manganese bacteria are present, a free chlorine residual of at least 1.0 mg/L is recommended to control the bacteria. This oxidation of the manganese dioxide media maintains the adsorption capacity and is effectively a continuous regeneration process. Application Rates Typical service flow rates (also referred to as application or loading rates) range from 7- to 15-gpm/ft2. These rates vary depending on water quality. The normal interval between backwash cycles is from 12- to -24 hours under most operating conditions. Operating pressure loss through the filter system at flow rates of 15-gpm or less per square foot of filter surface area is less than three (3) psig. The system normally overrides the time setting on the backwash controller when the pressure differential exceeds 5-7 psig. For Lakehaven Utility District's Well 17/17A/17B Water Treatment Facility, the service flow rate is set at 10 gpm/ft2 because the well output is limited to 1000 gpm. Based on pilot testing conducted, the installed treatment equipment is capable of handling >1100 gpm (at -11 gpm/ft2). Either of these rates will be exceeded during backwash when all of the well's water output is being run through 7 filters. Backwashing to Maintain Removal Characteristics After a specified period of adsorption, the vessels are backwashed to remove the adsorbed iron and manganese from the media. In the event that water quality adversely changes, the media will be backwashed when the pressure differential exceeds 6 psig. Backwash is normally performed with filtered system water but the system can be set up to backwash with water from an external source if necessary or desired. Unless required by the specific characteristics of a particular installation, the system remains on-line during backwash. A PLC is not included as part of the ATEC Iron & Manganese Removal System. However, the controller can interface with the customer's SCADA system, if desired. As mentioned above, much of the adsorption takes place in the top of the filter media bed. It follows that it is easier and more efficient to backwash the media before the iron and manganese that is being removed from the source water penetrates to the lowest sections of the media bed. For this reason, we recommend backwashing at least once every twenty-four hours of production and preferably every twelve hours, particularly at the outset. atec systems 2 Operations and Maintenance Manual Proper backwashing is a critical and controllable variable in the treatment process and merits significant operator attention. In excess of 98% of the calls ATEC Systems receive from customers having problems with removal, whether it be iron and manganese or particulate matter, are ultimately found to be related to improper backwash operations. HOW ATEC FILTERS BACKWASH The ATEC Iron and Manganese Removal System contains multiple vessels. The backwash controller operates only one backwash valve at a time. This design normally allows for the vessels to be backwashed with finished water, without the need for an extra source of backwash water from a storage tank and without the need for special backwash pumps. The illustration below shows how the filters operate under normal conditions and while backwashing. Normal Operation Backwashing Operation Backwash Backwash +matt 400**A 41.44149 Raw � `` Raw _. T ► ♦ • Finished Finished Backwash Variables Proper backwashing is one of the single most important variables in maintaining successful long-term system operation. There are three important components to backwashing including: (1) backwash frequency; (2) backwash flow or volume; and, (3)backwash duration. Backwash Frequency If the filter system is not backwashed often enough (frequency), the product water quality will be adversely affected by the presence of unwanted contaminants in the product water and, over time, the media bed will become progressively more contaminated. Backwash Flow Rate To successfully clean the media bed, it must be expanded until it is fluidized, allowing the contaminants to be removed with the backwash. If the backwash flow rate is too low, the media bed will atec systems 3 Operations and Maintenance Manual not fluidize. If the backwash flow rate is excessively high, the filter bed will expand to the point that media will be expelled with the backwash effluent. Neither condition is acceptable. Generally speaking, AS-741 Filter Media will begin to fluidize at about 27-to-28 gpm/ft2 and at a rate of 30-gpm/ft2 will have expanded on the order of 50%. This rate is approximately twice that required to fluidize most media. There are two primary reasons for this high backwash flow rate requirement: (1) AS-721 is much heavier than most media, having an apparent specific gravity of 1.96 and a real specific gravity of some 3.7; and, (2) AS-741 Filter Media is much larger than most media. The combination of high weight and large size results in the need for higher flow rates to fluidize the media. One benefit of these two factors is that the flow rate is high enough to effectively shear the bond between the media and the iron and manganese that have been removed from the source water, allowing it to be rapidly backwash to waste without the need for air-scour or other backwash aids. Duration of Backwash If each filter vessel backwash cycle does not continue for long enough (duration), insufficient time will have passed to allow the media bed to fully expand and the contaminants to be flushed out, cleaning the media bed. Properly setting and maintaining the backwash function will help assure successful filter operation over the life cycle of a filter system. Time/Pressure Differential Backup The backwash operation is activated by a controller that is located on the filter vessels. The controller initiates backwash by one of three methods: 1. A Timer that is integrated into the controller 2. A Pressure Differential switch that is integrated into the controller, or 3. Externally through a SCADA system The controller is designed to normally backwash by initiation of the timer located on the controller or via remote initiation by the SCADA system. The timer can be adjusted by the operator. The controller has four dials that control the backwash: ■ The Periodic Flush dial sets the backwash interval in hours. • The Backwash Time top dial sets the backwash time for an individual vessels in minutes ■ The Backwash Time bottom dial sets the backwash time for an individual vessel in seconds • The Dwell Time dial sets the time between backwashing individual vessels. The initial settings for this system are shown in the Table below: (have Atec recommend) Dial Initial Setting Periodic Flush 24 hours Backwash Time (Upper) 5 minutes Backwash Time (Lower) 0 seconds Dwell 5 Seconds atec systems 4 Operations and Maintenance Manual • The backwash controller keeps track of time only when power is available to the controller. Normally, the controller is powered by a"switched"circuit that is energized only while the well pump is operating. As a backup measure, the controller will also automatically backwash when the pressure differential switch is activated by exceeding a pre-determined level. The pressure differential switch can be adjusted. The pressure differential is normally set to 5 to 7 psig. A time delay, to avoid initiation of a pressure differential induced backwash, can be set from 0-to-180 seconds—it is recommended that the time delay be set for at least 90 seconds to avoid initiation of a PD backwash as the result of a transient PD condition. To adjust the pressure differential activation pressure, see the controller manual in Appendix D. In the event of a power failure, the backwash controller has the ability to resume a backwash cycle at the station that was backwashing at the time of the power failure. When the solenoids are without power, the backwash control valve on each vessel remains in the normal operating position (closed?). Integration with SCADA system The system can be externally monitored, or the backwash can be externally activated through a Supervisory Control and Data Acquisition (SCADA) system. An internal alarm from the controller can be monitored by attaching a relay to the alarm output on the controller. To initiate backwashing from a SCADA system, a relay is used to initiate the backwash by bypassing the periodic flush timer on the controller. The SCADA system can then initiate backwash based on time or on flow through the system. This is achieved by completing an electrical circuit wired to the back of the manual backwash initiation button. SPECIAL REQUIREMENTS This section covers some special design considerations including supplementing backwash flow, using special valves and providing adequate backpressure. Supplementing Backwash Water Supply Supplementing backwash water flow can normally be avoided by proper design and selection of the correct ATEC System for your installation. However, in some cases supplemental backwash flow is needed for a particular installation. In these cases, a separate backwash pump can be installed or the system can be backwashed with treated water from the distribution system. For Lakehaven's system, it is not advised to use system water containing a sequestering agent, such as a poly or ortho phosphate blend. Use of Normally Open/Normally Closed Solenoid Operated Valves in Backwash One method of ensuring adequate backwash in some special cases is to place a normally opened valve on the finished water discharge manifold of the system that closes during backwashing to ensure that all of the water treated by the ATEC Iron and Manganese Removal System is available for backwashing. The normally opened valve can be actuated by attaching a relay to the master control output on the backwash control panel. atec systems 5 Operations and Maintenance Manual • In some cases a normally closed valve will be included in the design. The normally closed valve may be connected to the discharge side of a distribution booster pump or some other source of water supply. When backwashing occurs, the normally closed valve opens and additional water supply is available for backwashing. This condition does not apply to Lakehaven's Well 21 site. atec systems 6 Operations and Maintenance Manual I,inc 9nnc Pressure Sustaining Valves(Backpressure Valves) Pressure sustaining valves are often used under one or a combination of more than one of three different conditions: (1) where there is not adequate backpressure to smoothly operate the backwash valves; (2) where there is low pressure and marginal supply to sustain full backwash flow is made available to the vessels as discussed above; or, (3)when the filters are located above a clear well or other storage facility to prevent the filters from draining when the are not operating. None of these conditions apply to Lakehaven's Well 21 site. Air Actuated Backwash Valves The backwash valves are normally set-up to change position using the hydraulic pressure of the system. In some cases, the hydraulic actuated valves are converted to air (pneumatic) actuated valves by connecting the 1/4" lines to an air compressor set. Air actuation of backwash control valves is normally considered when the operating pressure is below 50 psig or above 100 psig or when the valves are subject to freezing temperatures. In Lakehaven's case, an air compressor will be installed because the system valves are located outside and subject to freezing temperatures and the system pressure is 142 psig. The air supply line should be set, via the air compressor's regulator, at 1 or 2 psig above the system pressure. atec systems 7 Operations and Maintenance Manual Section II INSTALLATION ATEC Iron and Manganese Removal Systems are delivered on flat bed, over-the-road trucks. Normally, the appropriate media for the system to be installed is delivered on the same truck or set of trucks. Steps should be taken to assure that there is adequate room to maneuver the transport vehicle. Filters are strapped down with special tie-down straps and brackets that are designed to minimize damage to the filter's paint. The straps and brackets are the property of ATEC Systems. Please box them and return them to ATEC Systems within two weeks of delivery. If the straps and brackets are not returned, they will be billed to the customer at the rate of $100.00 for each set of one strap and one bracket. In all cases, it is important that the surface onto which the filters are being unloaded is level and adequately compacted to handle the weight of the filters and the vehicle being used to move them. It is also important to assure that there is adequate space to off-load and store the filter media until it is placed into the filter vessels. The media is packed and shipped in woven PVC bulk bags, each containing 2,250 lbs. of media. If the bags are to be stored for long period, they should be protected from the weather to keep the media dry. Exposure to sunlight should be limited in cases of prolonged storage as ultraviolet rays compromise the bags' tensile strength, reducing it by an average of 50% every six months. Unloading the Filters when they arrive Skid Mounted Skid Mounted Filters—these filters are best unloaded with a properly sized motor crane or forklift. Every skid is built with lifting eyes on each corner and forklift pockets positioned to accommodate a standard set of 5" forks. If using a crane to lift the filters, it is important to have a properly sized set of cables and spreader bars. Not Skid Mounted Filters that are not skid mounted should be picked up from the underside of the vessel with a forklift with padded forks. ■ Safety Precautions: NI DO NOT use an undersized crane or forklift to unload the filters 1 DO NOT stand under or near filter skids while they are being unloaded; I' DO NOT try to unload the filters on uneven ground or on hillsides or slopes which will increase the chances of the filters, which are naturally top-heavy, tipping over; v DO have a properly trained equipment operator in control of the equipment; y DO use properly sized spreader bars and rigging if using a crane to move the filter skids; Locating the Filters • The filters must be properly located on the foundation or pad as shown on the mechanical design drawings prepared by the project engineer. atec systems 8 Operations and Maintenance Manual Installing the Filters Most of the systems will arrive on-site, pre-assembled and skid-mounted. The only requirement for these filters is that they be properly located, aligned with the stubbed out or planned mechanical connections, leveled, shimmed with steel or plastic shims are specified by the project. However, if the system is not pre-assembled, all of the following steps should be followed: Leveling and Aligning the Filters 1. Place the filter tanks on the pad in the proper position with top access ports on the same side. 2. Position the lower manifold under the tanks so that the lower ports on the tank match the ports on the manifold. Supply and Discharge Piping Connections 3. Select the right sized coupling for this connection. Lubricate a groove type coupling gasket with gasket lubrication, spray silicone or soapy water. 4. Slip one gasket on each grooved pipe fitting on the bottom of each tank. 5. Raise the lower manifold and slip the gaskets over the pipe-fittings on the lower manifold. Assemble couplings around grooved fittings to attach the lower manifold. 6. Lubricate and slip gaskets onto grooved connections on valves. (Loosen valve-to-tank coupling to allow for alignment.) Locate upper manifold and attach to valve ports. Tighten couplings on valves and upper and lower manifolds. 7. Connect pressure gauges to upper and lower manifold threaded ports 8. If the system is not pre-plumbed and pre-wired, install solenoid valves in threaded port on valve actuators. Connect tubing and fittings between valves and solenoid valves. The solenoid port marked "CYL" connects to the valve actuator. The port marked "IN" connects to the tube from the valve body port. Install tee and pressure gauges to upper and lower manifold threaded ports. Connect tubing from tee to P.D. (pressure differential) switch. Note the high and low ports on the pressure differential switch in the control enclosure. Figure 1 Standard Controller and Solenoid Set-Up { i atec systems 9 Operations and Maintenance Manual In inn JnnR Figure 1 shows the standard configuration for the controller and solenoid valves on a four vessel filter system. There is one solenoid valve and one control valve per vessel. The control valve shown is operated hydraulically, but can also be operated by compressed air. Figure 2 Alternative Solenoid Valve Location 6 4 5 3 7 8 1 i. Inlet from Manifold asilliii011111111111111111 2. Outlet t0 Tank 3. Outlet to Backwash 4. Tube Connector 5. Tubing 1 '/;''1 ; �l` litf1' 6. pater Paul s.Way Solenoid Valve T. Hex Nipple 8. Exhaust Tube 11$111117 . i 2 Backwash Piping Connections A restrictor control valve on the backwash line is necessary for proper backwash adjustment. In Lakehaven's case, this is simply a gate valve that is adjusted to control flow. Electrical Connections The Alex-Tronix Model F4AC/DC/DCL-D can be operated on either AC or DC voltage. The default setting is AC, supplied at 120 VAC and stepped down to 24 VAC with a transformer located in the controller box. Therefore, the solenoid valves for this system are 24 VAC. Selecting the "DC" setting on the back of the circuit board will prevent the solenoid valves from operating. See the Owner's Manual in Appendix D for electrical design drawings and electrical connections. No other electrical connections are required to operate the equipment provided by ATEC Systems for this installation. Securing Filters to Foundation The filters should be secured to the foundation per the structural engineers' recommendations. The attachment can be made through the flanges provided on the inside corners of the skid, or, on systems that are not skid-mounted, through the holes on the individual tank legs. atec systems 9 Operations and Maintenance Manual June 2005 Touch-Up Paint a Matching touch-up paint is available on request from ATEC Systems for all treatment equipment sold. Touch-up painting should be completed after final installation and before acceptance of the system by the owner. Most filter galleries are corrosive environments--touch-up painting is an important part of maintaining the treatment equipment and extending its life. Loading the Media a Remove the top access cover and gasket and put in the proper media. Prior to filling, check inside filter tanks for any foreign material. The filter tanks should be filled to a level 1 foot below the top head and sidewall jacket seam. Clean access cover and gasket and replace. Lubricate and tighten bolt on access cover. ■ Connect the inlet and out lines to the filter system. The inlet source water connects to the upper filter manifold. The outlet water source connects to the lower filter manifold. The backwash line connects to the backwash manifold. OTHER CONSIDERATIONS Importance of Air Gap or BPD for Backwash Lines It is important that there be an appropriately sized and located device for eliminating the possibility of backwash water siphoning back into the filter system. There are two common methods for implementing this requirement which applies to treatment systems in virtually every jurisdiction: (1) a properly sized air gap in the backwash discharge line is the safest and usually the least expensive backflow prevention; and, (2) an approved backflow prevention device, most commonly a reduced pressure principal backflow prevention valve. ATEC Systems will be happy to share drawings or photographs of successfully implemented backwash configurations that have achieved this purpose. However, the specific installation for your treatment system is your responsibility. If you have any questions, you should direct them to your consulting engineer or a regional engineer for the State health authority having jurisdiction in your area (Washington State Department of Health, Oregon Health Division, California Department of Health Services, etc.). If an air gap is used, it is important to assure that the discharge line after air gap is adequate to handle the backwash flow-rate of 377-gpm without backing up—it is frequently underestimated. Air gap requirements are normally 2 times the diameter of the backwash discharge pipe above the air gap. Sample Ports Normally there is one sample port for raw water and a composite sample port for treated water. In rare situations, it is necessary to include a sample port for each filter vessel. It is important that properly located sample ports for both raw and treated water be included in the design. Depending on the specific design, the sample ports can be located on the inlet and outlet manifolds of the ATEC Iron and Manganese Removal System or on the system piping before the inlet connection point and after the outlet connection point for raw and treated water, respectively. In any event, it is important that the location of sample ports be determined early in the design and engineering phase of the project delays when the project is under construction; Air Relief Valves ATEC Iron and Manganese Removal Systems are shipped with provisions for the location of a 3/.", 1" or 2" air relief valve, depending on the particular requirements of each system. Air relief valves are normally provided by the owner and installed by the owner or his contractor. atec systems 10 Operations and Maintenance Manual June 2005 Air relief valves, if required, are a very important part of an iron and manganese removal system. Entrained air can adversely affect removal as well as the maintenance of stable chlorine residual. In addition,water hammers, their effect amplified by the presence of air, can damage equipment and pose a danger to personnel. Pressure Relief Valves ATEC Iron and Manganese Removal Systems are shipped with an appropriately sized pressure relief valve (PRV). The standard is a Bermad Series 400 or 700, depending on size, or a CIa Val Series 50 PRV. See Appendix F for information on equipment provided by ATEC Systems. Sand Separators The discharge of sand by water well pumps can pose a variety of problems. Among these are the possibility of damaging the well pump, creation of excessive head-loss (pressure differential) in the filter system and adverse effects on removal. Excessive wear and tear on the well pump is an issue beyond the scope of this manual. However, if a well is discharging excessive sand, serious consideration should be given to installation of a properly sized centrifugal sand separator (or some other mechanism to achieve the same purpose) up-stream of the filter systems... There are documented cases of wells producing enough very fine sand to create a head-loss of over 50 psig in less than an hour of pumping time, virtually shutting down water production. atec systems 11 Operations and Maintenance Manual Section III INITIAL START-UP This section of the manual summarizes the procedures followed during the ATEC Iron and Manganese System's initial start-up. Filling and Disinfecting the Filters and Media Prior to Initial Start-Up The system should be disinfected with chlorine bleach prior to start up. For a 48" diameter filter vessel, add 4 quarts of 5%% sodium hypochlorite (bleach) solution to each tank. Fill the tanks with water to a level just below the upper manifold. Hold for 12 or more hours and drain.3 If this is not practical, chlorinate source water to ± 2 mg/L free chlorine residual during the initial backwash phase of the start-up process which will last several hours. In either case, the media and vessels will be disinfected. The preferred method of filling the filter vessels is to allow water to flow back into the filter vessels from the distribution system rather than filling the vessels from the water well. The advantage of this method is that it reduces the possibility of water hammer and damage to the filter system or piping. Before Starting the System Check all wiring, mechanical connections, valves, and chemical feed equipment before starting the pressurizing the system. The follow tasks should be performed: -4 Visually check all electrical wiring to ascertain that it is securely terminated; Ni Pressure check all piping, valves and mechanical connections to make sure that they are leak-free; -4 Check chemical feed equipment to make sure that it is properly wired and that the tubing or piping that supply the chemicals being fed to the system are correctly installed and leak-free; \I If using sodium hypochlorite, partially fill the day tank with enough solution of an appropriate strength to check the system's operation and to chlorinate the system during startup. Purging Air from the Vessels Before starting the backwash process, which is one of the major steps of the start up process, it is important to purge the air from the filter vessels. This is usually done by manually operating the solenoid valves that control the backwash control valve for each filter vessel while the filter system is being slowly filled either from the system or from the water well that is being treated. Cleaning the Filter Media and Setting Backwash Flow Rates The required minimum backwash flow rate for this system is 327-gpm, the maximum rate is 377-gpm. The flow rate can be monitored by the backwash flow meter installed with this system. The flow rate can be adjusted by opening or closing the backwash control valve. If the backwash flow rate is too low the media may not be completely fluidized and the media may not be cleaned. If the backwash rate is too high the media can be lost through the backwash discharge line. During start-up, filter vessel will be backwashed for 4-minutes per vessel through one or two cycles at a rate of approximately 100-gpm. After completing one or two backwash cycles at 100-gpm, the backwash rate will be ramped up to the target rate of 377 gpm and the filters will be backwashed until the media is cleaned. 3 Regulatory authorities or discharge permits may require the de-chlorination of the drain effluent prior to discharge. If you are not familiar with the specific requirements in your area, check with local regulatory authorities or your consulting engineer for assistance in assuring compliance with these important regulations and policies. atec systems 12 Operations and Maintenance Manual In situations where there is a problem in disposing of large volumes of backwash effluent, for example when backwashing into a surge tank with severely limited discharge capacity, the process of cleaning the media bed can be extended over a period of several days. We have found that between 18 and 22 backwash cycles at 4 minutes per vessel are required to properly clean the media. The preferred method to accomplish this with a eight filter vessel system is to adjust the backwash frequency to once every quarter-hour with a backwash duration to 4 minutes per vessel. With these settings, the filter system will backwash continuously until halted. Approximately 8 hours per filter will be required to complete this operation. There may be a small amount of media discharged at start-up. This is normal and, unless the discharge is very heavy or continues for a prolonged period, is not a cause for concern. Chlorine Dose during Start-Up Backwash The water used to clean the media during the system start-up should be chlorinated. For this system, it is recommended that the water be chlorinated at a dose sufficient to yield a free chlorine residual of 1.5 mg/L in the backwash effluent. This will assure that the media is fully oxidized and properly disinfected. Readying the Treatment System for Operation After the media cleaning process is complete, the filters should be run to waste for 30 minutes after which the following tests should be performed on samples of the finished water: Free Chlorine Residual Manganese Iron This is the time to begin fine tuning the chlorine dose to achieve the target free chlorine residual in the product water. Assuming that field tests indicate that removal of iron and manganese fall within the expected range, finished water samples should be collected and sent to a laboratory. The samples should be analyzed for iron, manganese, and bacteria to assure that the water is acceptable for distribution. The laboratory results should be reported to any regulatory authorities as required in the local jurisdiction. atec systems 13 Operations and Maintenance Manual Section IV OPERATING THE ATEC IRON AND MANGANESE REMOVAL SYSTEM OPERA77NG THE ATEC IRON AND MANGANESE REMOVAL SYSTEM The operation of the ATEC Iron and Manganese Removal System is relatively simple. There are, however, several variables that need to be monitored and settings that need to be closely followed. The most important of these are summarized below: • Application Rates The design application rate is shown on the summary table at the front of this manual. This rate is based on the output capacity of the currently installed pump. If the pump is changed, based on pilot testing data, it is estimated that approximately 1000 gpm could be treated effectively, at a loading rate of about "10.0 gpm/ft2. ■ Setting Chlorine Level in Product Water The free chlorine residual of the treated water should be set at the recommended level shown in the summary table at the front of this manual and monitored at least on a weekly basis—and preferably on a daily basis. The chlorine residual should be maintained within 0.1 mg/L of the recommended level shown. • Setting Backwash Parameters The backwash frequency and duration will be initially set by ATEC Systems during start-up. The backwash frequency will normally range from 6 to 48 hours. The backwash duration will normally range from 3.5 to 5.0 minutes per vessel. In this case, we recommend starting with a backwash frequency of once every 24 hours with duration of 4 minutes per vessel. ■ Monitor Pressure Loss A typical ATEC Iron and Manganese Removal System will operate with a head-loss, or pressure differential between the water supply and discharge of about 3-psig. It is good practice to regularly monitor head-loss because it can be both a predictor and an indicator of filter condition. If the pressure loss exceeds 6-psig on a regular basis, the filter bed is fouled and should be checked immediately. Sample Ports and Water Quality Testing Sample ports for raw and finished water are provided on most systems. Please refer to the design drawings for the location of the sample ports. During the first few months of operation, it is good practice to regularly test system performance daily or at least several times per week paying particularly close attention to chlorine residual and manganese removal. After the system operators have developed a familiarity with the system, monitoring can be reduced to a weekly or twice weekly routine. ---REMEMBER--- • PROPER CHLORINATION IS CRITICAL TO THE SUCCESSFUL OPERATION OF YOUR SYSTEM • CORRECT BACKWASH OPERATION IS CRITICAL TO THE SUCCESSFUL, LONG-TERM OPERATION OF THE ATEC IRON AND MANGANESE REMOVAL SYSTEM ---Plan on a backwash flow-rate of at least 24 gpm/ft2--- atec systems 14 Operations and Maintenance Manual SHUT DOWN PROCEDURE The filters can be shut down and kept off-line for prolonged periods. The media can be kept either wet or dry. The normal procedure is to simply take the well pump off line. Assuming that the source water is adequately chlorinated, there should be no other action required to shut down. No special actions are required if the filters are to be drained, for example when shutting down a treatment system located outside, to prevent freezing in the winter months. START-UP AFTER PROLONGED PERIOD OUT-OF-SERVICE To start-up the filters after draining or more than 1 month off-line, use the following procedures. 1. If the filter vessels were drained, fill the vessels with water slowly; follow the start-up procedure to eliminate air from the vessels. 2. Filter to waste for at least one hour, providing the required chlorine dose and residual Qr 1. Add one quart of 51% sodium hypochlorite to each tank and hold for 6 hours. 2. Backwash the system two times in immediate succession. 3. Check chlorine residual. 4. Place on-line. MAINTENANCE Certain maintenance procedures must be observed for proper filter operation. The procedures discussed below should be implemented with the initial operation of the filters and on a regular basis thereafter. The following maintenance should be used as a guide rather than as a comprehensive list of every maintenance item that might require attention. Controller ■ The controller needs to be kept dry. If it is properly installed at the outset, the controller circuit board will last indefinitely. If it is damaged by a power surge, struck by lightning, is submerged, or similarly damaged, the repair is to replace the circuit board and wiring. Other than replacing a pressure differential switch, fuse or making sure that all circuits are properly terminated, there is no on-going maintenance for this component. Backwash Control Valves ■ Backwash control valves normally require very little maintenance. The recommended practice for Iron and Manganese Removal System installations is to exchange the valves on a five-year cycle. In case of emergency repairs or replacement, backwash control valves are always maintained in inventory and can be shipped for next day arrival. Solenoid Valves ■ Peter-Paul Model 70 3-Way Solenoid Valves are used to control the 3-Way Backwash Control Valves. Parts are available to rebuild the solenoid valves or the valves can be sent to A TEC Systems for rebuilding. The maintenance and cleaning procedures for the solenoid valves are shown in Appendix E. Backwash Restrictor Valves • Fully open and close the backwash restrictor valve on an annual basis. Remember to reset the backwash restrictor valve to allow the required backwash flow after exercising. atec systems 15 Operations and Maintenance Manual Lines and Valves • Inspect all line and valve connections for tightness and leaks. If leaks are observed, tighten coupling. IF this does not stop the leak, remove the coupling and inspect the gasket. If the gasket is worn or damaged, replace. When installing a gasket, it should be coated with a light lubricant. Control Tubing • Inspect all hydraulic or pneumatic tubing for leaks and restrictions or damage. If tubing is crimped or damaged, it should be replaced. Site Tubes ■ Every ATEC Iron and Manganese Removal System is shipped with a cast acrylic site tube to allow for easy observation of the backwash discharge. Overtime, this will discolor. The easiest way to clean the site tube is to remove it and soak it for fifteen minutes in a 5% solution of ascorbic acid and then wipe it clean with a soft cloth. Replacement site tubes are available. Media and Checking Media Levels ■ It is recommended that the media level in all filters be checked and recorded approximately once each six months. If the media is below the recommended level, enough of the appropriate media should be added to bring the level back to the recommended media bed depth. The recommended media depth should be maintained. The easiest way to maintain the appropriate depth is to open the access hatch on the top head and measure and record the distance from a fixed point on the access port to the top of the media at initial system start-up and at regular intervals thereafter. The media should be maintained within ± 2 inches of the initial media depth. Paint ■ Water Treatment Plants are typically corrosive environments. It is, therefore, important that paint be regularly touched up to protect the filter vessels and manifolds as well as other metal components in the facility. Touch-up paint kits are available from ATEC Systems or, if you prefer, paint can be ordered directly from TNEMEC, Inc. The color and number is included in the summary table at the front of this manual. TROUBLE SHOOTING The ATEC Model 48-60-08 Iron and Manganese Removal System is designed to provide years of trouble free service if you follow the installation and maintenance procedures outlined above. Nonetheless, from time to time, problems may occur as the result of power surges, lightning, unexpected changes in water conditions, failure to follow operating, particularly chlorination and backwash, and maintenance procedures outlined above or for a variety of other reasons. The Trouble Shooting Guide on the following page is designed to help you identify, trace and resolve the more common problems that have been reported to us over the years. Please review your problem and the Trouble Shooting Guide carefully before seeking outside help. Usually your filter system will be back in operation much more quickly if you follow the steps outlined in the Trouble Shooting Guide and the rest of this manual before you call for assistance. That said; do not hesitate to call for help at any time. The earlier problems are identified and resolved, the less potential there is for service interruption. atec systems 16 Operations and Maintenance Manual ATEC Iron and Manganese Removal System Troubleshooting Guide Problem and Likely Causes Solution Poor Iron and Manganese Removal 1. Check chlorine residual; consider increasing it to 1.0 1. Improper chlorine dose mg/L. 2. Insufficient backwash flow or frequency 2. Check restrictor valves. Backwash more often. 3. Inadequate media volume 3. Add media to reach proper level or volume. This problem may be caused by excessive backwash flow rate. See Backwash Flow Control Consistently Hiah Pressure Differential? 1. Drain tanks,remove hand-hole access covers and 1. Excessive contaminant load restricts flow through remove any excessive or caked contaminants on the filters and prevents sufficient flow to properly media bed surface. Add media to proper level. backwash filters. 2. Adjust badkflow wash control valve to allow for 2. Insufficient backwash flow, increased backwash volume. 3. Sand in media bed. 3. Sample raw water for sand content. Backwash Valves Leak? 1. Remove obstruction 1. Obstruction in valve seat. 2. Replace rubber poppet 2. Rubber poppet is worn or damaged 3. Replace diaphragm. Install pressure regulator is 3. Diaphragm is damaged(leaking from bleed port of necessary to control problem. diaphragm chamber at rear of valve. Water Hammer? 1. Install vacuum breaker on backwash line. 1. Long backwash line causing vacuum. 2. Bleed off trapped air. Check for leaks in pump 2. Air in tanks. suction. Air bleed off valve may help. Thcreasina Freauencv of Backwash Cycle? 1. Readjust backwash flow. 1. Duration of backwash or flow is inadequate to flush 2. Add media to achieve proper level. Check backwash filter bed of contaminants. flow. 2. Insufficient media volume. 3. Install Additional filter tank(s)to system. 3. Increased levels of contaminants in water supply. (Possibly seasonal problem.) Automatic Backwash Fails to Cycle? 1. Turn power on. Assure that wiring is properly 1. Controller power off or circuit breaker tripped. connected. Re-set circuit breaker. 2. Improper setting of pressure differential switch. 2. Adjust as required. 3. Insufficient system pressure to actuate valves. 3. Check system for pressure leaks(break in irrigation 4. Solenoid(s)malfunctioning. line,cracker pressure control tubing,etc. 4. Check connections. aean parts. Check filter screen on high pressure control line for damaged screen and replace if necessary. Decreasing iron or manganese removal 1. Check backwashing rate,frequency and duration. 1. Improper backwashing Make sure all valves are operating. 2. Improper chlorine residual 2. Check chlorine residual on a daily basis. 3. Change in raw water quality 3. Check raw water iron and manganese concentrations Steadily increasing head-loss 1. Check raw water for sand content. 1. Sand in raw water 2. Check backwashing rate,frequency and duration 2. Improper backwashing atec systems 17 Operations and Maintenance Manual I......'Mil= EQUIPMENT FOR ON-SITE ANALYSIS OF WATER QUALITY AND RELATED PARAMETERS If it is not already a part of the system's operating procedures, we recommend that every water system that includes an iron and manganese removal system have the capability to analyze key water quality parameters. These include tests for iron and manganese, hydrogen sulfide (if present) and free and total chlorine. A variety of colorimeter and spectrophotometer based analytical tools are available for analyzing these variables as well as many others. If pH adjustment is a part of your system's treatment, a good quality pH meter should be included as part of your treatment equipment. If you purchase or generate sodium hypochlorite, it is recommended that you have the tools on hand to analyze the strength of the sodium hypochlorite solution. This ability will help the system operator accurately monitor chlorine dosing levels as well as the strength of the sodium hypochlorite solution you are purchasing. The strength of sodium hypochlorite solutions can be determined by titration or by the use of a hygrometer. Either tool will work; the best tool for your site will depend on your specific circumstances and needs. ATEC Systems normally suggests the use of a digital titrator which can also be used for a number of other purposes. If you have any questions about analytical equipment, your consulting engineer is often a good source of information and suggestions as to what type of equipment you might wish to consider. REPAIR PARTS Generally, we are able to ship repair parts the same day if they are ordered by noon. Because of this level of service, most of our customers do not maintain extensive repair parts inventory. If, however, your circumstances warrant the maintenance of a repair parts inventory, the following list that some of our customers have found helpful: A. Controller Board (1 each) E. 1/4"OD Tubing, High Pressure (50') B. Control Valve (1 each) F. Fittings for Tubing (press-to-lock) C. Control Valve Rebuild Kits (1 each) (6 each, tees and 90°elbows) D. Solenoid Valve (2 each) G. Pressure Gauges (1 each) These parts can be ordered from: ATEC Systems Associates, Inc. P. O. Box 518 Longview,Washington 98632 Telephone: 360-693-6202 Facsimile: 360-397-0375 atec systems 18 Operations and Maintenance Manual _�111'l0 9nnc - FIGURE 1 N so J 0 1 CC O i 1 W 0 0 W CO H NI Z LH Z W= C- 2 a aFn J Z Z V. gi i_,l J J Z i^ L CC II ! I U Z CC 0 m};w CC �} W a Z �2 e 3 a O Q i-ao a • J CC i >-a 1 w CC Cl- m CC_�J 3 J F w W U) C a v o 7 w a �? az w Z Q a 7n a CC -`J' z I- VN z 3 - r >- s } 3ajo aW C O 0 Q CO N J Z Cl) sV CO Q cD� O a' m Z U �'i z o x m 0 J 81 � z ff COa O N o Cc U F- o _i I o - O �.nLN :p. :r. I lll "l•� l ill: 11 I. Co Lillt !j 'p,l. n 1II, I`_, i ; ,ij i It'. �;jl!Illi:i OJ ilt°' Il 1 :Li'+Pii;":'`: :oi'�.I'IfE-I If dl1l.Il I IrlllI 1-hill II,I ii,jlili Ill O N U W C U H LL 1 ` ) 9 CC1,, —V, .. US a `� z X W a W F_- w E-- (I) m a ? OC y W „; w ?- f . D ._ E-- W (I) Y D _I U cc) Q N z 0 F- W w W 0- 0 a v 0 i Z Z F- ..„o000 o0 D �W° OP cm. AypU�Oo i CC U y I I I '� — 0 O N N M