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01-101534 City of al W Community Deerelopme�m Services Building - Single Family Permit #:01 - 101534 - 00 - SF 33530 1st Way S Federal.Way,WA 98003.621E Ph:253.661.4000 Fax:253.661.4129 Inspection request line: 253.835.3050 Project Name: TKACHUK Project Address: 28107 28TH AVE S Parcel Number: 231240 0030 Project Description: SFR-Install manufactured home. (SEE ADDITIONAL ATTACHED CONITIONS LIST) NO decks or garage under this permit. Owner Applicant Contractor Lender ANATOLIY TKACHUK ANATOLIY TKACHUK NONE NONE 30016 41ST AVE S 30016 41ST AVE S AUBURN WA 98003 AUBURN WA 98003 NONE Includes: Census category: 113-New tr tii #2 #3 #4 Occupancy Group: R-3 Construction Type: Occupancy Load: Floor Area(Sq.Ft.): Ist Floor Proposed Sq.Feet 1344 Census Category 113-New manufactured/fact( Height of Structure 11.5 Occupancy Group#1 R-3 Total Building Sq.Feet 1344 Total Proposed Sq.Feet 1344 Zoning Designation RS 9.6 CONDITIONS: 1.No building shall encroach onto any building setback line or easement shown or not shown. 2.Maximum building height is 30 feet above average building elevation. 3.Retain&protect identified significant trees per FWCC,Sec.22-1565 through 1569.Bright protective fencing is required at the dripline of retained trees. 4.The driveway shall be paved per FWCC,Sec.22-1453.The driveway shall be paved from the existing roadway pavement edge,or curb,to the garage or carport. 5.Maximum driveway width is 20 feet. 6.Building setbacks are:20 feet front;5 feet side; 5 feet rear. 7.Service connections for electrical&communication facilities shall be placed underground per FWCC,Sec. 16-48. 8.Structures,fill or obstructions(including but not'limited to decks,patios,outbuildings or overhangs)shall not be permitted beyond the building setback line or within the drainage easements.Additionally,grading& construction of fencing shall not be allowed within the drainage easements shown on the plat,unless approved by the City of Federal Way. 9.Prior to any clearing or grading on a lot,the owner/builder shall install temporary erosion/sedimentation control facilities approved by the City.These facilities must ensure that dirt or sediment laden water does not enter the public drainage system,adjacent lots or public streets.The owner/builder bears the responsibility to maintain the facilities in proper working order,replacing as necessary.The facilities may be removed only after such time as construction is complete&landscaping is installed.See attached for standards and site plan for location of silt fencing. 10.This decision shall not waive compliance with future City of Federal Way codes,policies,or standards relating to the subject proposal. PERMIT EXPIRES January 20,2002,IF NO WORK IS STARTED. Permit issued on July 24,2001 I hereby certify that the above information is correct and that the construction on the above described property and the occupancy and the use will be in accordance with the laws,rules and regulations of the State of Washington and the City of Feder Owner or agent: Date: 07 a,L(. 0 \ ONE LIST RE: Permit#01-101534-000-00-SF; TKACHUK 28107 28th Ave S 1) All recommendations per geo-technical report shall be adhered to throughout project. 2) Prior to placement of Magnum pads and piers,the geo-technical representative shall visit the site and verify coil conditions. The City of Federal Way shall be provided with a copy of all special inspection reports and compaction test results prior to placement of the manufactured home. 3) The minimum roof slope for manufactured homes on single-family lots is 3 and 12 or 25% slope. No manufactured home shall be allowed on a single-family lot with a slope less than 3 and 12. 4) A licensed manufactured home installer shall be required to install the home. 5) The garage and decks shown on the plot plan are by separate permit and are not included with this permit. There shall be no construction of the decks or garage structures until permits have been obtained. 6) There shall be NO occupancy until the Building Inspector signs off the project. • Doc.I.D. POST THIS CARD ON THE FRONT OF BUILDING `ff`r G BUILDING DIVISION INSPECTION RECORD INSPECTION REQUEST PHONE#: 253-835-3050 PERMIT#: 01-101534-00-SF OWNER'S NAME: ANATOLIY TKACHUK SITE ADDRESS: 28107 28TH S ( ) FOOTINGS/SETBACKS ( ) FOUNDATION WALL ( ) DRAINAGE: Line ( ) Connection „gel, Fm ' � ..., h' '"r Y.,_, ( ) UNDERFLOOR FRAMING ( ) ROUGH PLUMBING: DWV Water piping ( ) ROUGH MECHANICAL Gas piping ( ) SHEATHING Roof Floor ( ) SHEAR WALLS () ELECTRICAL ROUGH-IN Ditch Cover ( ) FIRE/DRAFTSTOPS a ( ) FRAMING/FIRESTOPPING ( ) INSULATION: Floors Walls Attic k; F3 % 6M 3 0i��. e e�/f® ° I'd Z1(Q)Z,E'1/6): % t ,:. �,� s ` ( ) WALLBOARD NAILING ( ) SUSPENDED CEILING !',R " :i}S°2; ae 14:4!I' ,s y.) 6 1~ ,,0 .ry � �4( Aft3, 6 jetft ( ) ELECTRICAL FINAL () PLANNING FINAL ( ) PUBLIC WORKS FINAL ( ) FIRE FINAL ( ) BUILDING FINAL i , ., R. c" �� ®, 4 e44 ,. "- CONSTRUCTION PERMIT APPLICATIC N) Fry°' mom-- R EC E\ PLICATION NUMBER: .� - l .U_f: r3 , CATION NUMBER: . ^' ** lii�jBB ea Ynformation—Please print(in ink)or type** Please note: Electrical,Are Prevention Systems and Engineering permits may require a separate application. ■ PROPERTY INFORMATION SITE � ADDRESS: 23I07 d VP S ASSESSOR'S TAX/PARCEL it: Q 31 Qt O - 0030 • LEGAL DESCRIPTION OF SUBJECT PROPERTY(ATTACH SEPARATE DESCRIPTION IF LENGTHY): ' ■ PROJECT INFORMATION • [l3 B TYPE OF PROJECT(This application): UILDING 0 PLUMBING 0 MECHANICAL 0 DEMOLITION • 0 ELECTRICAL 0 ENGINEERING❑ FIRE PREVENTION SYSTEM PROJECT DESCRIPTION(Provide detailed description): � -T7'L( /Z-(Ga/CC i f Irkg £_ I � PROJECT NAME: /K Ct-C I'm.'K ■ PEOPLE INFORMATION DAYTIME PHONE: PROPERTY OWNER: �^ (ZSj NE: - 6o6I I ✓Avicctol haul", MAILING ADORES: *DORMS;Cmr,STATE,ZIP): 20016 tllsf ewe S Abc LS S? a 3oc)k CONTRACTOR: "'6"� �-- N4cf 'Airr_o pP t.s s PHONE (� �3 I • MAILING ADORNS ADDRESS;CITY,STATE,ZIP): EVENING PHONE . ( )7i4f :S8'L3 CITY of FEDERAL WAY BUSINESS LICENSE NUMBER: fax NUMBER: CONTRACTORS REGISTRATION NUMBER: EXPIRATION DATE: 3 I 4, 12060 DAYTIME PHONE: APPLICANT: e �-- (Z j3 ) sG f� -60G( ?er e I KC,C- K (2 5- ) q4 MAILING ADO ADDRESS;CITY,STATE,ZIP): 300/6 Lll sf co.de s ,ram s i !SB o0l (2 5 2) 3415 - 6 06( RELATIONSHIP TO PROJECT: FAX NUMBER: ❑ ARCHITECT ❑TENANT 0 OTHER(DESCRIBE): ( (.( ) ( / I EMAIL ADORPSS: 11 CONTACT PERSON FOR THIS PROJECT: 0 PROPERTY OWNER 0 APPLICANT ❑CONTRACTOR ■ DETAILED BUILDING INFORMATION EXISTING USE: EXISTING BUILDING ASSESSED/APPRAISED VALUATION $ PROPOSED USE: -C/A,G.CS- X-rrile/ PROPOSED VALUATION FOR IMPROVEMENTS: $ S 643-4= ,Oc p SPRINKLERED BUILDING? 0 YES ktNO FIRE SUPPRESSION SYSTEM PROPOSED/REQUIRED:0 YES 0 WATER SERVICE PROVIDER: LAKEHAVEN 0 HIGHLINE 0 TACOMA 0 PRIVATE(WELL) SEWER SERVICE PROVIDER: ,LAKEHAVEN 0 HIGHLINE 0 PRIVATE(SEPTIC) • 1 0 **NEW RESIDENTIAL CONSTRUCTION ONLY** NUMBER OF BEDROOMS: - '+ ESTIMATED SELLING PRICE: COO ■ PROTECT FLOOR AREAS • FLOOR EXISTING SQ.FT. PROPOSED SQ.FT.• TOTAL BASEMENT FIRST (r 3 CC SECOND /^�THIRD FOURTH FOURTH • OTHER FLOORS(DESCRIBE) DECK ' GARAGE HOW MANY FLOORS? �/ TOTAL: 3% T i .$ FIXTURES Indicate number of each type of fixture MECHANICAL AIR HANDLING UNIT(S) EVAPORATIVE COOLER(S) GAS LOG(S) REFRIG.SYSTEM(S BBQ(S) FAN(S) HOOD(S) WOOOSTOVE(S) BOILER(S) FIREPLACE INSERT(S) RANGE(S) MISC.[ COMPRESSOR(S) FURNACE(S) DUCT(S) GAS PIPE OUTLET(S) HEAT SOURCE: 0 ELECTRIC 0 GAS PLUMBING BATHTUB(S). LAVATORY(S) URINAL(S) WATER HEATER(Si DISHWASHER(S) RAIN WATER SYS. VACUUM BREAKER(S) 0 ELECTRIC 0 GAS DRINKING FOUNTAIN(S) SHOWER(S) WASH MACHINE OUTLET GAS PIPE OUTLET(S) SINK(S) WATER CLOSET(S) MISC.[ INTERCEPTOR(S) SUMP(S) ■ DISCLAIMER/SIGNATURE BLOCK I certify under penalty of perjury that the information furnished by me is true and coned to the best of my knowledge,aril further,that I am authorized by the owner of the above premises to perform the work for whidi the permit application is made. I further agree to hold harmless the Oty of Federal Way as to any daim(including costs,expenses,and attorneys'fees Incurred in tti investigation and defense of such claim),which may be made by any person,including the undersigned,and filed against the City Federal Way,but only where such daim arises out of the reliance of the city,including its officers and employees,upon the accura r.of the Information supplied to the city as a part of this application. /' '-`NAME/TITLE: DATE l 't _' 00 At 0 PROPERTY OWNER APPLICANT 0 CONTRACTOR • t t���:"r7 :p, ' �,aar: max: a EU Z' �e�. a f �, .r. ' tit �'? C .-1 :�1 i .. r-1 r -l - x f_S. kiJA `+t) .yram E--�` ` .:ix QOr4MItNNIrY OEVEU3Pt4ENT SERVICES•33530 FIRST WAY SOUTH•P.O.80X 9718•FEDERAL WAY,WA 98063-9718.253661-4000•FAX:253661-4129 `. aTYoF G MEMORANDUM ga=iffinFa --CoftWntunity Development Seivioes Department 33530 1 ST WAY SOUTH DATE: January 11, 2002 TO: File FROM: Joan Hermle SUBJECT: TKACHUK-(01-101534-00-SF) 28107 28T1-1 AVE S This memorandum is intended to document the inspection history and progress in detail of permit 01-101534- 00-SF. HISIMIRY It is important to understand that this is the second attempt of Mr.Tkachuk to place a manufactured home on a single-family lot. The first attempt failed as the intended home was a flood-damaged home and the lot had been illegally filled without a permit. The firs home was constructed pre 1976 and did not meet zoning requirements. After various code enforcement actions,what was left of the home was hauled away. SECOND PERMIT APPLICATION HISTORY On April 17, 2001, Mr.Tkchuk applied for a second permit to place a manufactured home on a SF lot. The plan went through Building Review,and after many conversations back and forth in an attempt to get a good plan, the permit was finally issued with specific conditions placed on the permit(conditions are listed as a document in AMANDA). The second home was a 1985 Champion home. Since the lot had been filled illegally,the applicant was required to supply the Building Department with a Geo- Technical report,which addressed fills and site-specific foundation design over fill. The City received a report (by AML Geo-tech Services)dated March 9,2001 on March 14, 2001. Based on this report,a condition was added to the permit to provide the City with a geo-tech field report to verify that soil conditions where adequate for placement of the Magnum piers (which were the applicants choice on foundation design). Provided with a foundation plan (Magnum Piers) and an acceptable tie-down plan,the permit was for the second time issued. Some time later Mr.Tkachuk's son Sergey(or John)came to our counter to provide a copy of the field report. The report was not from the original geo-tech but in fact a second geo-tech(AMEC)whom had been retained to do the field verification. In that report,it was stated that the geo-tech"could not comment on the potential for settlement". This sent up red flags for the Building Department,as it is Code to ensure that footings are on firm compacted soils and that over-settlement does not occur. Sergey was told to provide a remedy for the situation(either dig down to bearing soil or get a positive geo-tech for placement of the home. At this time it was the end of July or beginning of August 2001. Months went by and nothing was heard from the applicant. Finally, it was realized that the Cities Electrical Inspectors had been out on site for service permit inspections. That sent a red flag because it was realized at that point that the home had probably been set without a favorable geo-tech report. On 12/21/01,I visited the site to asses what the situation was. It was observed that the house had been set on blocking but not tied down properly. Additionally, a footing/foundation wall had been poured at the perimeter of the house for placement of the skirting which was also in place. Since it was late in the day and getting dark, I wrote a correction notice that listed several items of which one was that additional inspections may be required in fully asses what the next course of action would be. On 12/26/01,Scott and I went out to the site to do a complete inspection. A list of items where provided to Mr.Tkchuck which were in addition to the list provided the week before. In addition,a STOP WORK notice was placed on the home. It was explained that no work could be done on the house(electrical and building). .' Sergey was told to get a certified manufactured home installer to make recommendations and come up with a way to block and anchor the home to an approved standard (this was an original condition of the permit). Blaine from"Blain's Mobile Services"was retained to complete a blocking/tie-down per the ANSI standard. Alta arrneetibrV at-City Hall with Maim I gave Mn the go-ahead to do the work. On January 11, 2002, Scott and I re-visited the site again to inspect the bloddng/tie-downs as well as any other corrections that we observed. While the bloddng/tie-down seemed to meet the general standard several other problems still exist as detailed in the correction dated January 11,2002. Some of the corrections where for new violations such as the illegal hot water tank,the illegal sewer hook-up method,the lack of a drainage inspection,etc... When I asked Mr.Tkachuk how the house was heated because it was obvious there was no ducting or crossovers installed, he said that he has electric baseboard in each room. Scott and I both observed a garbage pile with what was probably the old flex heat ducting. From the previous site visit in which we walked through the house,we observed that many items of the home were being altered without apparent knowledge of L&I. We observed skylights being cut into the ceiling,doors being added, windows changed to doors,framing installed where the dryer duct used to penetrate the outer wall,new roofing,new exterior sheathing,the addition of two cantilevered decks,etc... The STOP WORK will be left in place and electrical inspections withheld until two major items occur. 1)An L&I permit is obtained and verification exists that L&I has walked through the home and acknowledges it meets code,and 2)that most of the major corrections to-date have been at a minimum satisfied. 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'+'r+''•'• •...... .. ...... \ ..............:}::.. ....,.x....,.........,,.:}}4\a\\....,..,....n.,.:,X"\,.:X.:...:......\......�} . ... .... . ..•: ::�.::,.'�<}.y�!}+:4#:•)};'Nii:i"w.J:Ttik :i�:;\.... . .... .. ... ...... ... ............ .. .. •........ ...... •• . .... ..... ,..:aX{{J�;}}}}•}}Y.ta. \•::: :a{�-a;•:t•:;•>:,: .,{J.��� . ..,, \:@�. .r,. ..a.'k... .. ..:.. :.c.. ..:..+.:.......»t..,.\t.:+.......,.,,......,,,,+.+,. .,........+......,t,Ja...a:...... ....... . ..•. .. :::.: ;::;tX::::;k:�:: �:�:y' .�:iir': Rn • RECEIVED BY COMMUNITY rv7i r - T,�=PARTMFNT J U L 15 2002 LAKEHAVEN UTILITY DISTRICT 4. Aceliaveti 31627-1st Avenue South • P.O. Box 4249 • Federal Way,Washington 98063-4249 �(' Federal Way:253-941-1516 • Tacoma:253-927-2922 TILITY DIST,, www.lakehaven.org July 11, 2002 Anatoliy Tkachuk 30016 41 st Avenue South Auburn, Washington 98001-2216 RE: 28107 28TH AVENUE SOUTH Side Sewer Connection Dear Mr. Tkachuk: This letter is a follow-up to the previous transmittal from the District sent to you, dated January 15, 2002, and a final notice of account/billing status for the referenced side sewer connection (SS Permit No. 23605). The District has received and accepted your "Affidavit Regarding Utility Connection" with regard to date of connection to the District's sewer system. Based on a connection date of February 1, 2002, as noted in the Affidavit, your sewer charges will be adjusted as follows: 1. Monthly Sewer Base Charges — Charges to be retroactively applied effective February 1, 2002 pursuant to District Resolution No. 99-887. Previous transmittals and billings had set this "effective" date as January 23, 1998, based on the date of water meter installation for the property. 2. Sewer Volume Charges — Charges to be retroactively applied effective February 1, 2002. Previous transmittals and billings had set this "effective" date as January 23, 1998, based on the date of water meter installation for the property. Tom Jovanovich Dick Mayer Donald L.P.Miller Ed Stewart Beverly J.Tweddle Commissioner Commissioner Commissioner Commissioner Commissioner Anatoliy Tkachul - _— July 11, 2002 Page 2 A copy of this transmittal is being forwarded to the District's Customer Service section, as that section will be making the appropriate billing adjustments. If you have any specific questions regarding the billing adjustment, you may contact Jean Gardiner at 253-946-5436. If you have any other questions or need additional information, you may reach me by e-mail at basbury@a,lakehaven.org, by fax at 253-529-4081 or by phone at 253-946- 5407. Sincerely, Brian Asbury Engineering Technician III Enclosures C: /Joan Hermle—City of Federal Way Ec: Customer Service—LUD Dev. Services—LUD 28107 28th Ave S-Tkachuk-Followup Final.doc e �. ��� '` i , 44 to . it f 0V, 41 'e 'r. • • e . r ; 't•r • ,r ,31 yeti.#. `� y"4 • '1 N., .• a ' 4 " \ `, ' ter t i j - �'r {; t1 k, I� ltar " % ;'a . I--_— _-•' '„a++-'" •r 'N«�.'r" !6 RECEIVED BY oomvuv1Tv nr,, ,.-,,T n PARTMFnIT JAN 1 6 2002 . A �+ AL 1 v LAKEHAVEN UTILITY DISTRICT 31627-1st Avenue South • P.O. Box 4249 • Federal Way,Washington 98063-4249 tkTtLITY DISi'I� Federal Way:253-941-1516 • Tacoma:253-927-2922 www.lakehaven.org •January 15, 2002 CERTIFIED MAIL RETURN RECEIPT REQUESTED Anatoliy Tkachuk 30016 41st Avenue South Auburn, Washington 98001-2216 RE: 28107 28TH AVENUE SOUTH Side Sewer Connection Dear Mr. Tkachuk: On December 1, 1997, you were issued a Side Sewer Permit for the referenced address. This permit was later voided on October 15, 1999 due to notice the . District received that the property was vacant and the residential structure was to be demolished. The District has been recently informed that the Side Sewer has been previously connected to the District's sewer system. Additionally, a check of District records shows recent water consumption, implying a use of the Side Sewer and District sewer system Therefore, you are required to do the following to avoid suspension of your current water service: • Re-submit an application, and the accompanying Site Plan, for a Side Sewer Permit, no later than January 29, 2002. After receipt of the application, the District will prepare the permit and notify you when it is ready for payment and issuance. • Once the Side Sewer Permit is issued, have the underground, side sewer line exposed and prepared for inspection by District staff. • You will immediately be responsible for all applicable sewer base and volume charges, from the date of water meter installation (January 23, 1998) • to the current date. Please contact the District's Billing staff, at 253-946- 5436, for specific billing questions. Tom Jovanovich Dick Mayer Donald L.P.Miller Ed Stewart Beverly J.Tweddle Commissioner Commissioner Commissioner Commissioner Commissioner Anatoliy Tkachuk January 15, 2002 Page 2 If you have any questions or need additional information, you may reach me by e- mail at basbury@lakehaven.org, by fax at 253-529-4081 or by phone at 253-946- 5407. Sincerely, Brian Asbury Engineering Technician I Enclosures C: ‘ oan Hermle—City of Federal Way Ec: Billing—LUD Dev. Services—LUD Certified Mail No. 7099 3400 0016 6001 0927 28107 28th Ave S-Tkachuk.doc s r is R t AML GEOTECHNICAL SERVICES, INC. ',:: -- _ Soil Mechanics, Rock-Mechanics, Grountrw—&er HIWOlogy" C Sri 1 1.9 June 11,2001 14Ee ik MR.SERGEY TKACHUK f� r Pr""7 4. 28404 228th Avenue SE AVv ai Q Maple Valley,WA 98038-5105 CITY OF FEDERAL w ity Regarding: Evaluation of the use Magnum •11, i S ' in lieu of Poured Footiu DEPT. Property (Tax Parcel # 231240-0020) 1,• a 281 3 28th Avenue South, Federal Way, Washington Dear Sergey: We have reviewed company literature describing the above-referenced foundation systems,and have also visited the local distributors' facility in Lakewood,Washington,for the purpose of examining the system at first hand and discussing its' capabilities with company representatives. Based upon the information now at our disposal we are of the opinion that the system may be used in lieu of poured footings at the above- referenced provided that our understanding of the proposed construction is correct. This understanding is that you shall have carried out the site stabilization measures discussed in our report(dated March 9,2001) for the move-referenced parcel, and that the only construction planned for the site is the erection of a manufactured home produced after 1976. The Magnum Foundation System shall only be used in compliance with all of the manufacturers' recommendations regarding the installation of the system (including the number of pads utilized.) In addition,the pre-formed pads shall only be set on firm native soil havina minimum bearing capacity of 1000 psf All pad excavations shall be examined by a qualified soils engineer, to verify soil suitability and bearing capacity prior to the installation of the system Provided that all of these recommendations are implemented we can find no geotechnical reason why the Magnum Foundation System as we understand it should not be utilized to support a manufactured home at this site. We trust that this letter will have satisfactorily addressed your concerns in this matter, but please call the writer at 360-413-1745 should you have any further questions. LIMITATIONS This report has been prepared in accordance with generally accepted engineering principles and practices. We make no warranty,either expressed or implied. The opinions expressed are based upon the results of our investigations,and observable conditions at the site. They should not be applied to other,surrounding properties. If conditions are encountered which appear to differ from those described in this report we should be immediately notified, so that we may review the situation and, if necessary, modify the recommendations of this report. In the event that such notice is not forthcoming we retain the right to disclaim any or all of the recommendations contained herein. This report is for the information of our client, Mr. Sergey Tkachuk, only. Its' reproduction and/or transmittal to any third party by any means, except in its'entirety, without the written authorization of AML Geotechnical Services,Inc.is prohibited. We would like to thank you for having given us this opportunity to provide you with geotechnical engineering services. Please contact the writer at 360-413-1745 should you have any questions regarding any of the contents of this report. This study has been carried out in association with ADaPT Engineering Inc.,800 So.Maynard Street,Seattle,whose technical assistance we gratefully acknowledge. Q Yours very sincerely j — ts.fI r L p C AML Geotechnical 'ces,Inc. !I► • GRp ADaPT Engineering,Inc. .. / w lyNlilike aastAk—: 'N---": "`) Z.,....-.7 e.....‘" Alastair Lum , . ng., , Kurt W.Groesch,P.E. Geotechnical Engineer/Principal .�� �„ -; Principal 6009 Jon Court SE, `�'fi� ? "� a :'<% Telephone:360-413-1745� � �% Olympia, WA 98513 ` `-,, - - `ti'} eA _ 1T.,L ' Facsimile:360-413-3917 Gt. : L _ '- - 6/i t- AML GEOTECHNICAL SERVICES, INC. Soil Mechanics, Roc roundwater Hydrology March 9,2001 R EC E l V E D GO PV MR.SERGEY TKACHUK APR 17 2001- 28404 2281e Avenue SE Maple Valley, WA 98038-5105 �., , Lor ��„�rti &.VyAY BUILDING DEPT. Regarding: Geotechnic al Evaluation of a Property (Tax Parcel # 231240-0020) located at 28103 28th Avenue South,Federal Way,Washington Dear Sergey: We have carried out the studies necessary to complete the above-referenced evaluation. The following letter will convey to you our findings and conclusions reached,and make recommendations to be followed during any future development of the property. SITE DESCRIPTION The property under discussion is located on the west side of a cul-de-sac at the north end of 28th Avenue(a dead end street)a block north of its' intersection with 282a°Street,and extends to the west to a frontage onto Military Road. The property slopes down from 28th Avenue towards the west, but appearances suggest that the site has been disturbed by grading,and that the existing slopes are man-made. The slope leading down from the cul-de-sac is relatively gentle along the south side of the property, but becomes progressively and significantly steeper towards the north,reaching an inclination of more than 100%at the north property line(see attached photographs.) The slope adjacent to the south property line appears to follow(more or less)the inclination of the original native slope,continuing relatively uniformly down to the west property line. The central sector of the lot is marked by a short,steep slope descending from the street to level out onto a relatively level bench that continues to the west end of the lot. This bench is bounded on its'north side by a steep,almost vertical,blackberry covered slope that rises to a flat bench that extends west from, and at approximately the same elevation as the cul-de-sac (see photographs.) The southwest corner of the lot, adjacent to Military Road, drops off steeply from the central bench, into a hollow containing a number of large evergreen trees. PTOJECT DESCRIPTION As we understand matters at the time of this writing the proposed development of this lot is to consist of the placement on it of a mobile home style,single-fiunily residence. FIELD INVESTIGATIONS The writer has visited the site on four occasions, the first of which was a preliminary inspection only,at which time no actual investigative work was undertaken. The second visit took place on Wednesday, January 31,2001, for the purpose of inspecting a number of hand-augered soil borings. These had been completed in lieu of test pits that the writer had asked to be excavated,and provided no useful subsurface information other than to indicate that fill of unknown quality and depth was present at some locations. Subsequent to this,a third visit took place on Monday,February 12,at which representatives of the City of Federal Way were present,to discuss the known history of the site and to establish the minimum required scope of field exploration required by the City. Accordingly, a fourth site visit took place on Monday, 1 February 19,at which time the writer supervised the excavation of five(5)exploratory test pits. Soil logs from these pits are attached to this report,and their approximate locations are shown on the attached site plan. A number of photographs were taken at this time also,and to the extent possible(dense blackberries al prevented access to some areas)surface features on the steep slopes were examined. c 6009 Jon Court SE, Telephone:360-413-1745 Olympia, WA 98513 Facsimile:360-413-3917 • AML Geotechnical Services, Inc. -2- FINDINGS The test pits revealed l the locations that were investi: . d that the fill at some locations is as much as . ' - - . heavily contaminated with wood debris,including sizeable logs (see attached . ' , - The centrally located bench, which is, as we understand matters,the proposed home site, is the least affected. In this area the fill layer, which is on the surface, is from 30 • inches to 3 feet thick,but appears to be of structural quality,and apparently uncontaminated,at kat at the test pit locations. However, the steep slope that drops off into the depression (referred to in a previous section)in the southwest corner of the property,adjacent to Military Road,is almost entirely composed of heavily contaminated fill. Appearances strongly suggest that while its' toe may be close to its' original natural location,the upper part of this slope has been man-made by soil having been pushed into the area from elsewhere on the lot. The boles of a cedar tree and an adjacent alder,the trunks of which are now protruding from the slope face,have been buried for depths of two to three feet. Appearances suggest that after the property was cleared of trees some of the stumps and logs were bulldozed onto the lower,western end of the lot,where they were buried by subsequent grading on the upper part of the property. Similarly, the steep slope that bounds the proposed building site on its' north side(see photographs)is composed of fill. Although it is covered by a dense growth of blackberries we found that the slope face concealed under the vines is in fact so steep(almost vertical)at some locations as to be devoid of vegetation,thus the soil is exposed. It is an unnatural mix of compacted native soil(mixed sand,silt,and gravel)that has clearly been disturbed. Appearances suggest that at least the upper part of this slope is composed of soil graded out onto the original slope when the cul-de-sac at the and of 28, Avenue was constructed. CONCLUSIONS&RECOMMENDATIONS ©CDPI( General Comments The results of our investigation clearly indicate that the entire site has been disturbed, and that the southwestern corner of the lot contains fill that is contaminated and thus not of structural quality. However, the contamination that we encountered was,with the sole exception of a length of what appeared to be an old choker cable, found to consist of wood debris only. The latter, as the attached photographs clearly show, contains some sizeable logs, and with the passage of time these will undoubtedly decay, with the probability of voids then fuming in the soil mass that contains them. The question of the presence of wood debris of this kind having an adverse environmental effect on the area lies outside our particular areas of expertise. However,regardless of other environmental considerations,we arc of the,opinion that at least some of this fill should be removed from the site. If left in place in its' present location,eventual voiding of the soil in that part of the lot is likely to occur,and theme protruding front the face of the slope now will die. Also,the existing slope is overly steep,and should be flattened to a mote gentle inclination that will render it less prone to possible erosion due to runoff from areas higher up the slope, To achieve this it is recommended that a tracked excavator,working from above,be utilized to pull soil back from the existing toe-line of the slope. The slope should be re-configured to an inclination of 3H: i V,or,working from the existing toe-line, to a uniform inclination that exposes the original ground surface around the bases of two protruding trees, whichever is achieved first. From a geotedhnical stand point it is not necessary to remove all of the contaminated fill from the site,but it should be removed as prescribed above, and to the extent that the new slope is carried to the north until it daylights into the existing ground surface on the bench. The slope descending to Military Avenue appears to be stable,and probably will not require grading to the north,away from the area of the slope under discussion. Site Stability,General The existing steep slopes on the southern end of the lot are apparently man-made,and are,at least in their upper parts, composed of fill. However,appearances suggest(from soil exposed on the steeper faces and visible under the blackberry vines)that the fill is clean gravelly soil in a dense condition. There are no indications of soil movement on the face of the slope or behind its'crest(as would be indicated,for • AML Geotechnical Services, Inc. Soil Mechanics, Rock Mechanics, Groundwater Hydrology ---- _ _ __._. -3- example, by tension cracks or other linear features such a small escarpments.) We could find no indications of erosion,either past or present,that might adversely affect the stability of the slope or cause silt contamination of the area below. From all of the forgoing we are therefore of the opinion that the slope,although man-made,is in a stable condition,and as long as it remains undisturbed we believe that it is likely to reinain ale. It is of modest height, and mostly covered with protective vegetation: in our opinion the only likely destabilizing events that would be cause for concern would be any under nining of the toe during cushion,or if runoff from the street above were to increase for any reason. Therefore it is strongly recommended that excavation at the base of the slope for any reason should be minimal,and if possible,avoided altogether. If it is unavoidable to encroach upon the toe of the slope in order to facilitate construction, then it is strongly recommended that the slope shall be reduced by grading it to a uniform inclination not exceeding at IV. Any cut made into the toe of the slope shall be stabilized. For cuts less than 4 feet in height rockeries may be used to stabilize the base and prevent erosion. For cuts of 4 feet or more in height engineered retaining structures shall be required to prevent destabilization of the slope above. If retaining structures(note that a rockery is not a retaining structure,but an erosion control device only)are required the following values shall be used in their design: • Lateral Earth Pressure(F.E.P.),Active 45 lbs/fl Lateral Earth Pressure(F.E.P.),at Rest 65 lbs/R' CO[PIZ • Coefficient of Sliding Friction,1Cf, 0.35 A curb(or raised pavement edge)should be constructed on the street above to prevent runoff from entering the area. Soils Characteristics&Foundations As noted in a previous section there is fill present across the proposed building site,and our investigations indicate that it is free of unsuitable contamination and that it is in a dense condition. Based on these observations we do not believe that it is necessary to remove this material from the site in order to facilitate construction. Howeverr,two test pits within the proposed building area cannot provide enough information to rule out the possibility that there may be some unsuitable fill present at other locations. The soil that we observed possesses sufficient bearing capacity to support a frame-built single family residence on conventional shallow foundations (om, continuous or;read footings.) As we understand matters the proposed dwelling is to be a mobile home,thus the structural loads are likely to be well within the bearing capacity of the soil that we have observed in the building area. It is strongly-recommended the 'dwelling be set upon a conventional footing and not on pier blodua:this will distribute loading in the event that small pockets of less competent soil are present. It is also strongly recommended that footing excavations shall be inspected by a soil engineer, to verify soil suitability and bearing capacity before concrete is poured.. Erosion& Enviroameetal Contents We do not believe that erosion will be a significant problem during or subsequent to construction on this site. The potential for runoff from above to enter the parcel is limited by the relatively small area that drains from above, and if a curb or raised pavement edge is constructed as we have recommended in a previous section,then such runoff will become negligible. It is our understanding that the vehicular access will of necessity be by way of a driveway descending into the property from 28m Avenue. The driveway should be so constructed that nmoff from the street will not flow down it into the property,and runoff from its' surface shall be controlled and directed into a grass-lined swale or other suitable collection system. If construction is undertaken during the rainy season the construction site should be protected from uncontrolled runoff from above by any one of several acceptable methods. Temporary drains, sandbag berms,or suitably placed straw bales, or a combination of these may be employed. ,A silt fence should be placed along the west side of the work area,and extend to the southwest along the toe ofthe slope that is to be reconstructed(see site plan.) AML Geotechnical Services, Inc Soil Mechanics, Rock Mechanics, Groundwater Hydrology APPENDIX AML Geotctnnicul Services, Inc. • Soil Mechanics, Rock Mechanics, Groundwater Hydrology -4- Summary ©O P\ii In summary, we are of the opinion that although the site been disturbed by apparently illegal grading and now requires rehabilitation by the removal of unsuitable fill and the re-grading of some of the slopes,it is nevertheless a feasible site for the proposed construction. We do not believe that the wood debris that we have noted at the site poses an undue environmental threat but from a geotechnical point of view it is • definitely unsuitable material upon which to set structures of any kind. Provial t Mil Alf the Jecommendatioas of this report are implemented,without exception,then it is our opinion dratiberersali not then be any geotedmical reason why the proposed-constnuliesalsagsbautrbeallowed to proceed. LIMITATIONS This report has been prepared in accordance with generally accepted engineering principles and practices. We make no warranty,either expressed or implied. The opinions expressed are based upon the results of our investigations,and observable conditions at the site. They should not be applied to other,surrounding properties. If conditions are encountered which-appear to 'err fiw n ire describedMelds report we should be htunedlotely notified, so that we may review the situation and, if necessary, modify the cream ntendationsaofthis repot. This report is for the information of our client,Mr.Sergey Tkachuk,only. Its' reproduction and/or transmittal to any third party by any means,except In Its'entirety, without the written authorization of AML Geotechnical Services,Inc.is prohibited. We would like to thank you for having given us this opportunity to provide you with geotechnical engineering services. Please contact the writer at 360-413-1745 should you have any questions regarding any of the contents of this report. We gratefully acknowledge the services of ADaPT Engineering, So. Maynard Street,Seattle,(Tel.206-654-7045)as our technical referee during this study. Yours very sincerely AML Geotechnical Se Inc. ADaPT Engineering,Inc. Ze:0- Alastair Lumsden,P.Eng. Kurt W.Growth,P.E. Geotechnical Engineer/Principal Principal ,4�oGRO w r+si�,d, AML Geotechnical Services, Inc. SITE PLAN Showing Slopes&Approximate Test Pit Locations Scale: 1"=20' (Not a Survey,Topography by Others) 1 • • / )%i 7 7 TP—3 4 410 14 TP-2 Steep Beek 4t2 , 4/6 TP-1 1 t t• 1 418 t ` ' t • t Tr-4 t i .y • t t % Ditch t� �i t 1 420 ' t t * Tree t t ., .! t / 1 t t t 436 11-.--.-N t ri ` t tl • t t 28*Avenue • AML Geotechnical Services, Inc • • Soil Mechanics, Rock Mechanics, Groundwater Hydrology EXPLORATORY TEST PIT SOIL LOGS TP—I 0—7' Mixed sand and gravel containing large pieces of wood,including small logs(FILL) 7'-8'/:' Dense yellow to brownish-yellow sandy silt to silty sand,some mottling 8' Hole bottom(no groundwater encountered.) TP-2 0—4' Mixed gravel and sand containing numerous wood fragments(FILL) 4'—5' Dark brown organic soil(topsoil,original ground surface?) 5' Hole bottom(no groundwater en countered.) TP-3 0—7' Mixed gravelly soil containing logs and stumps(FILL) 7'—9' Dark brown organic soil(original topsoil at ground surface?) 9' Hole bottom(no groundwater encountered.) TP-4 0—3' Mixed gravelly soil,(Glean FILL) 3'—5' Yellowish-brown silty sand,dense,damp 5' Hole bottom(no groundwater encountered.) TP—S 0—30" Mixed grayish-black gravelly soil(eleurFILLO 30"—5' Brown to yellowish-brown silty sand with some gravel 5' Hole bottom(no groundwater encountered.) END,EXPLORATORY TEST PIT SOIL LOGS AMI Geotechnical Semites, Inc. • Soil Mechanics, Rock Mechanics, Groundwater Hydrology 4 i�", is zi a .M1r � .,� h ..a.' P. t 1? ti', A., �5,fa • _1, a N F . V • b t ,; f e,',,,.,4 _,. ,,,,,,‘...;.„_ • ..,1, 1-4,:'-'V 2'''" ',. ' .!'"21-:',k*i4-‘.,,;$•,..ig i L.,,, A ''-4 z. ` J 3344 - ! l iby '.' gam ", _ /"ice 1 .{ �`_ K_- '�!' Facing north across the centrally-located level bench(the proposed building site.) Test Pits excavated here revealed from two to three feet of clean fill. The blackberry-covered slope in the background also contains fill. , . , AML Geotechnical Services, Inc. ' Soil Mechanics, Rock Mechanics, Groundwater Hydrology 4: At_ ib -t t,AAAAI�rrr'.y1111... 7' r' `}-. 1 s7. i�' if tit il F!• V[ '1,,' �, .4 n 4� `�J °\ g I..: q * .-"1 yam, , d View towards the southwest corner from the center of the level bench. A Test Pit excavated on top of the bank directly above the cedar tree revealed about seven feet of contaminated fill(the log visible at center right came out of the fill.) Czssac-D) t q-(ba qzc AML GEOTE___NICAL SERVICES, INC. • Lou)-Hr�o) a(—to 16-3(,- Soil Mechanics, Rock Mechanics, Groundwater Hydrology August 31,2001 FLE Z 01 0 MR.SERGEY TKACHUK 28404 228th Avenue SE Maple Valley, WA 98038-5105 Regarding: Soil Bearing Verification at a Property (Tax Parcel # 231240-0020) located at 28103 28th Avenue South,Federal Way,Washington Dear Sergey: The following letter will confirm information already conveyed to you verbally during our recent telephone conversation. In response to your request the writer traveled to the above-referenced site on Friday,August 24,2001,and inspected 12 spread footing excavations. All excavations were found to be in firm native soil containing no visible evidence of contamination from organic debris. All excavations were dry,'and were probed in a number of locations,using a standard 1/2-inch diameter T-probe. The probe under an applied weight of 150 pounds could not be made to penetrate the soil by more than 1 inch at any location. Based upon these observations we are satisfied that the exposed soil in the excavations that we inspected has the requisite bearing capacity of 1000 lbs/f12 for the placement of footing jacks under a mobile home. LIMITATIONS This report has been prepared in accordance with generally accepted engineering principles and practices. We make no warranty,either expressed or implied. The opinions expressed are based upon the results of our investigations,and observable conditions at the site. They should not be applied to other,surrounding properties. If conditions are encountered which appear to differ from those described in this report we should be immediately notified, so that we may review the situation and, if necessary, modify the recommendations of this report. In the event that such notice is not forthcoming we retain the right to disclaim any or all of the recommendations contained herein. This report is for the information of our client, Mr. Sergey Tkachuk, only. Its' reproduction and/or transmittal to any third party by any means, except In its'entirety, without the written authorization of AML Geotechnical Services,Inc. is prohibited. We would like to thank you for having given us this opportunity to provide you with geotechnicai engineering services. Please contact the writer at 360-413-1745 should you have any questions regarding any of the contents of this report. This study has been carried out in association with ADaPT Engineering Inc.,800 So.Maynard Street,Seattle,whose technical assistance we gratefully acknowledge. Yours very sincerely AML Geotechnkal Selvices,Inc. ADaPT egi ring,Inc. Alastair Lums g; c Kurt W.Groesch,P.E. Geotechnical Engineer/Principal • i - � n Principal • L — 6009 Jon Court SE, Telephone:360-413-1745 Olympia, WA 98513 Facsimile:360-413-3917 DAILY FIELD REPORT R C;EIJEDi hCES ��� Y AMU!Earth&Environmental,Inc. COMMUNITY DEVELOPMENT DEPA 11335 Na.122ne Way,Suite 100 Tel (425)820-4669 Kirkland,Washington 98034 Fax (425)821-3914 — PROJECT AME PROJECT NO. FIELD REPORT NO. 'r ka c 4 u k Res,deu rthic 06sefzi tr ui ArAt/' l ADDRESS / �'( /fir � DATE PAGE V / V7 �'� Ar e/ st e/>`� 7/30 , OF CITY OR COUNTY PERMIT NO. ARRIVAL TIME DEPARTURE TIME Fe,ciler4-t 4.452y , (A.Mf9 0 2t ) C)7,30 CLIENT AEE PROJECT MANAGER/PHONE NO. S€ J , /c' �ti a A It ex h H /' VP �v v f 57)-- > - GENERAL CONTRACTOR AEE FIELD REPRESENTATIVE/PAGE MVP �A...6.m..c< tea- y f 7t5-- SUBCONTRACTOR WEATHER TYPE OF WORK PERFORMED 54.:Y.G a.QSer LiA-TOM/ EQUIPMENT USED AI7Ea Rep aN psi r-e iv 043 s er vP e-1 sTT Sc/fict -te cccsiL ec1OJ 41 Tr-COLS. 7 -fie &,p c i -Icy,. w,s cl.{3.s e'ry a c, 7.0 /3 e, .Oeiv s e, .D may, QPrfeAi Ai $,L rjL ,544.10 w)'r4I/ sc/.',"e , -.4 'ee, -064s. 2T .ZJ acir cr iOlioN ry19r rive °ASP,'rie4 tse. /1i S AN/ /4-1,Low14A Le eei4 -.`ruy c./4,0`4c.-may cJi .49' LP sr l9.O0 p # i —i3OQr— 59 v.yre /,,ci.�. Cue Hove pQr For, pz) wd sc,0 a-ur'Fi0-ce a rserv.4n u.tis_ AS 5 uc1l c-ve., c N d 7 co ryi.�emir- 014-1 1'-rtle /°d re,' r%�L F-b/L .5er7re'.L/?-tesv7 0ei cS4,40,iv,.., d - rr'c `sc_c/°e5 /9/9 TAic eitPr 1C) 7 e r-c7ods*',0 BoJ'L16tiV� f441 S♦ ,L r- s//O xi) ee c"n/aer-ir 0Crin Sr M-tix 451n(1clr/2c, / cpice4 Qit/ r-ey 5c le_ /!1/¢y eaczoe ri e.'ti c e- ek-e ss i ve Se rr'errl ery 7- -7'i -1 e Scha r-A--,o e .. 5 0 T- / r0/3 a/-L y pita/wedO s B ? tir ; .� ' ,fib_ Is . Flo �w� �+s, CISTE4 ~�' F %NAL E'll Z-J 'le Minus 0 3_1 a 42,3 I The contents of this field report were discussed with the-ve rtreelek-Vila jg ussenlelise. adoivei- L PRESEN T E ❑ A preliminary copy of this field report was left on site. All recommendations contained herein are subject to change pending review by the AEE project manager. A T M GE AMEC Earth&Environmental,Inc.(Rev.11/00) O1- I01534f - 6D c$F )AILY FIELD REP ORT RESUBMITTED MEC Earth a Envinininealit -- AUG 0 6 2001 __ 336 K ., fir — Vent w84M18bi 20034 fax (42$)821-Y/14 , JSCTAI It MOJeC►NO PILO WORT NO rkec4f uk 12eS,dwmtt 46set-v0.7, AtlD/017- l rir Tr OR G01NR1 NIT NO MM11NK fM! 01,48TtM�Tas Feder t-C'4' , t4.141 0 9c.c) C1`�'3'0 .APO Kt MOJ*C,MAMOIPIVIPPOCesi NO cerJ',ty rkesch ii A Q4x 1,ev H f'' $' - *v),- waRK cownRActoit •IELD RalggtHCATIVIAWI eaiTax4cTOR PA c Arivt "to.WORE POIFC O Sap.C a43e.f v Atrit!t/ w urea /9j17E/7__....._. 1?? _. ..,. z to rCI Uaserve eXi sl7 i "sA IN rn ames. 7-Ate Stit-F*t' 4-4.14S a4s re-A,edl 7 .AC._ 1) s co 0 4QA 44,4-rN 041714 47r.+v,•L 2 T . Socir i ogt ry♦l r' y-Aie C ttt ,' ¢!D' 40, . ostrots 111111 .„.1r114, o Ayf. ?;7:::44.000 et ripen wan illioxisie 4M14 Ihim.80111104•41/810 ,„„, 1 A Polhillnerf mpg or MRf Us Row me Mt an sit& Mwoomenovialinsiordikwo f*if r «8rLw.wN.aew .wlal.aw.q, 4 r. , AML GEOTECHNICAL SERVICES, INC. Soil Mechanics, Rock Mechanics, Groundwater Hydrology March 9,2001 MR.SERGEY TKACHUK - 28404 228th Avenue SE Maple Valley,WA 98038-5105 Regarding: Geotechnical Evaluation of a Property (Tax Parcel # 231240-0020) located at 28103 28th Avenue South,Federal Way,Washington Dear Sergey: We have carried out the studies necessary to complete the above-referenced evaluation. The following letter will convey to you our findings and conclusions reached,and make recommendations to be followed during any future development of the property. SITE DESCRIPTION The property under discussion is located on the west side of a cul-de-sac at the north end of 28th Avenue(a dead end street)a block north of its' intersection with 282°d Street,and extends to the west to a frontage onto Military Road. The property slopes down from 28th Avenue towards the west, but appearances suggest that the site has been disturbed by grading,and that the existing slopes are man-made. The slope leading down from the cul-de-sac is relatively gentle along the south side of the property, but becomes progressively and significantly steeper towards the north,reaching an inclination of more than 100%at the north property line(see attached photographs.) The slope adjacent to the south property line appears to follow(more or less)the inclination of the original native slope,continuing relatively uniformly down to the west property line. The central sector of the lot is marked by a short,steep slope descending from the street to level out onto a relatively level bench that continues to the west end of the lot. This bench is bounded on its'north side by a steep,almost vertical,blackberry covered slope that rises to a flat bench that extends west from, and at approximately the same elevation as the cul-de-sac (see photographs.) The southwest corner of the lot, adjacent to Military Road, drops off steeply from the central bench, into a hollow containing a number of large evergreen trees. PTOJECT DESCRIPTION As we understand matters at the time of this writing the proposed development of this lot is to consist of the placement on it of a mobile home style,single-family residence. FIELD INVESTIGATIONS The writer has visited the site on four occasions, the first of which was a preliminary inspection only,at which time no actual investigative work was undertaken. The second visit took place on Wednesday, January 31, 2001, for the purpose of inspecting a number of hand-augered soil borings. These had been completed in lieu of test pits that the writer had asked to be excavated,and provided no useful subsurface information other than to indicate that fill of unknown quality and depth was present at some locations. Subsequent to this,a third visit took place on Monday,February 12,at which representatives of the City of Federal Way were present,to discuss the known history of the site and to establish the minimum required scope of field exploration required by the City. Accordingly, a fourth site visit took place on Monday, February 19, at which time the writer supervised the excavation of five(5)exploratory test pits. Soil logs from these pits are attached to this report, and their approximate locations are shown on the attached site plan. A number of photographs were taken at this time also,and to the extent possible(dense blackberries prevented access to some areas)surface features on the steel)slopes were examined. RECEIVED BY 6009 Jon Court SE, COMMUNITY DEVELOPMENT DEPARTMENT Telephone:360-413-1745 Olympia, WA 98513 MAR 1 2001 Facsimile:360-413-3917 AML Geotechnical Services, Inc. Soil Mechanics, Rock Mechanics, Groundwater Hydrology —____ 2 FINDINGS The test pits revealed the presence of fill at all the locations that were investigated,and that the fill at some locations is as much as seven(7)feet deep,and heavily contaminated with wood debris,including sizeable logs (see attached photographs.) The centrally located bench, which is, as we understand matters, the proposed home site, is the least affected. In this area the fill layer, which is on the surface, is from 30 inches to 3 feet thick,but appears to be of structural quality,and apparently uncontaminated,at least at the test pit locations. However, the steep slope that drops off into the depression (referred to in a previous section) in the southwest corner of the property,adjacent to Military Road, is almost entirely composed of heavily contaminated fill. Appearances strongly suggest that while its' toe may be close to its' original natural location,the upper part of this slope has been man-made by soil having been pushed into the area from elsewhere on the lot. The boles of a cedar tree and an adjacent alder,the trunks of which are now protruding from the slope face,have been buried for depths of two to three feet. Appearances suggest that after the property was cleared of trees some of the stumps and logs were bulldozed onto the lower,western end of the lot,where they were buried by subsequent grading on the upper part of the property. Similarly, the steep slope that bounds the proposed building site on its' north side(see photographs)is composed of fill. Although it is covered by a dense growth of blackberries we found that the slope face concealed under the vines is in fact so steep(almost vertical)at some locations as to be devoid of vegetation,thus the soil is exposed. It is an unnatural mix of compacted native soil(mixed sand,silt,and gravel)that has clearly been disturbed. Appearances suggest that at least the upper part of this slope is composed of soil graded out onto the original slope when the cul-de-sac at the end of 28 Avenue was constructed. CONCLUSIONS&RECOMMENDATIONS General Comments The results of our investigation clearly indicate that the entire site has been disturbed, and that the southwestern corner of the lot contains fill that is contaminated and thus not of structural quality. However, the contamination that we encountered was,with the sole exception of a length of what appeared to be an old choker cable, found to consist of wood debris only. The latter, as the attached photographs clearly show, contains some sizeable logs, and with the passage of time these will undoubtedly decay, with the probability of voids then forming in the soil mass that contains them. The question of the presence of wood debris of this kind having an adverse environmental effect on the area lies outside our particular areas of expertise. However, regardless of other environmental considerations,we are of the opinion that at least some of this fill should be removed from the site. If left in place in its' present location,eventual voiding of the soil in that part of the lot is likely to occur,and the trees that are protruding from the face of the slope now will die. Also,the existing slope is overly steep,and should be flattened to a more gentle inclination that will render it less prone to possible erosion due to runoff from areas higher up the slope. To achieve this it is recommended that a tracked excavator,working from above,be utilized to pull soil back from the existing toe-line of the slope. The slope should be re-configured to an inclination of 3H: 1 V,or,working from the existing toe-line, to a uniform inclination that exposes the original ground surface around the bases of two protruding trees, whichever is achieved first. From a geotechnical stand point it is not necessary to remove all of the contaminated fill from the site,but it should be removed as prescribed above, and to the extent that the new slope is carried to the north until it daylights into the existing ground surface on the bench. The slope descending to Military Avenue appears to be stable,and probably will not require grading to the north,away from the area of the slope under discussion. Site Stability,General The existing steep slopes on the southern end of the lot are apparently man-made,and are,at least in their upper parts, composed of fill. However,appearances suggest(from soil exposed on the steeper faces and visible under the blackberry vines)that the fill is clean gravelly soil in a dense condition. There are no indications of soil movement on the face of the slope or behind its'crest(as would be indicated,for AML Geotechnical Services, Inc. Soil Mechanics, Rock Mechanics, Groundwater Hydrology -- -- -3- example, by tension cracks or other linear features such a small escarpments.) We could find no indications of erosion,either past or present,that might adversely affect the stability of the slope or cause silt contamination of the area below. From all of the forgoing we are therefore of the opinion that the slope,although man-made,is in a stable condition,and as long as it remains undisturbed we believe that it is likely to remain stable. It is of modest height, and mostly covered with protective vegetation: in our opinion the only likely destabilizing events that would be cause for concern would be any under-mining of the toe during construction,or if runoff from the street above were to increase for any reason. Therefore it is strongly recommended that excavation at the base of the slope for any reason should be minimal,and if possible,avoided altogether. If it is unavoidable to encroach upon the toe of the slope in order to facilitate construction, then it is strongly recommended that the slope shall be reduced by grading it to a uniform inclination not exceeding 2H: 1 V. Any cut made into the toe of the slope shall be stabilized. For cuts less than 4 feet in height rockeries may be used to stabilize the base and prevent erosion. For cuts of 4 feet or more in height engineered retaining structures shall be required to prevent destabilization of the slope above. If retaining structures(note that a rockery is not a retaining structure,but an erosion control device only)are required the following values shall be used in their design: • Lateral Earth Pressure(F.E.P.),Active 45 lbs/ft3 • Lateral Earth Pressure(F.E.P.),at Rest 65 lbs/ft3 • Coefficient of Sliding Friction,Kf. 0.35 A curb(or raised pavement edge)should be constructed on the street above to prevent runoff from entering the area. Soils Characteristics&Foundations As noted in a previous section there is fill present across the proposed building site,and our investigations indicate that it is free of unsuitable contamination and that it is in a dense condition. Based on these observations we do not believe that it is necessary to remove this material from the site in order to facilitate construction. However,two test pits within the proposed building area cannot provide enough information to rule out the possibility that there may be some unsuitable fill present at other locations. The soil that we observed possesses sufficient bearing capacity to support a frame-built single family residence on conventional shallow foundations (i.e., continuous or spread footings.) As we understand matters the proposed dwelling is to be a mobile home,thus the structural loads are likely to be well within the bearing capacity of the soil that we have observed in the building area. It is strongly recommended that the dwelling be set upon a conventional footing and not on pier blocks:this will distribute loading in the event that small pockets of less competent soil are present. It is also strongly recommended that footing excavations shall be inspected by a soil engineer, to verify soil suitability and bearing capacity before concrete is poured. Erosion&Environmental Concerns We do not believe that erosion will be a significant problem during or subsequent to construction on this site. The potential for runoff from above to enter the parcel is limited by the relatively small area that drains from above, and if a curb or raised pavement edge is constructed as we have recommended in a previous section,then such runoff will become negligible. It is our understanding that the vehicular access will of necessity be by way of a driveway descending into the property from 28d)Avenue. The driveway should be so constructed that runoff from the street will not flow down it into the property,and runoff from its' surface shall be controlled and directed into a grass-lined swale or other suitable collection system. If construction is undertaken during the rainy season the construction site should be protected from uncontrolled runoff from above by any one of several acceptable methods. Temporary drains, sandbag berms,or suitably placed straw bales, or a combination of these may be employed. A silt fence should be placed along the west side of the work area,and extend to the southwest along the toe of the slope that is to be reconstructed(see site plan.) AML Geotechnical Services, Inc. Soil Mechanics, Rock Mechanics, Groundwater Hydrology_ __ -4 Summary In summary,we are of the opinion that although the site been disturbed by apparently illegal grading and now requires rehabilitation by the removal of unsuitable fill and the re-grading of some of the slopes, it is nevertheless a feasible site for the proposed construction. We do not believe that the wood debris that we have noted at the site poses an undue environmental threat but from a geotechnical point of view it is definitely unsuitable material upon which to set structures of any kind. Provided that all of the recommendations of this report are implemented,without exception,then it is our opinion that there will not then be any geotechnical reason why the proposed construction should not be allowed to proceed. LIMITATIONS This report has been prepared in accordance with generally accepted engineering principles and practices. We make no warranty,either expressed or implied. The opinions expressed are based upon the results of our investigations,and observable conditions at the site. They should not be applied to other,surrounding properties. If conditions are encountered which appear to differ from those described in this report we should be immediately notified, so that we may review the situation and, if necessary, modify the recommendations of this report. This report is for the information of our client,Mr.Sergey Tkachuk,only. Its' reproduction and/or transmittal to any third party by any means, except in its'entirety, without the written authorization of AML Geotechnical Services,Inc. is prohibited. We would like to thank you for having given us this opportunity to provide you with geotechnical engineering services. Please contact the writer at 360-413-1745 should you have any questions regarding any of the contents of this report. We gratefully acknowledge the services of ADaPT Engineering, So. Maynard Street,Seattle,(Tel.206-654-7045)as our technical referee during this study. Yours very sincerely AML Geotechnical Se ' es,Inc. ADaPT Engineering,Inc. A - •ct,- if IA) 4-e-t t41 - Alastair Lumsden,P.Eng. Kurt W.Groesch,P.E. Geotechnical Engineer/Principal Principal ¢�S 1.J. wGAR el s �J, esi) 0,?, • 4, 1946� `� ``UN:�LL'J � uu 3h3 '1E:/0.Le AML Geotechnical Services, Inc. Soil Mechanics, Rock Mechanics, Groundwater Hydrologk _ APPENDIX AML Geotechnical Services, Inc. Soil Mechanics, Rock Mechanics, Groundwater Hydrology --- SITE PLAN Shoving Slopes&Approximate Test Pit Locations Scale: 1"=20' (Not a Survey,Topography by Others) � 1 •�.• Alitta,3 Di y .1y . / )14 TP-3Ilk 4 410 �I TP-2 Steep Bank • `'y 412 • t 4 f6 TP-1 1 t r 1 1 418 A VI t1 1 11, t , • t 1 1 TP-4 t • t � 1 Ditch t t� / 1 t ` 420 1 TP—S 1 1 Tree tt 1 1 1 1 /1 N �� 1 / �� t 1 ,-s t t si 1 t 28a Avenue AML Geotechnical Services, Inc. Soil Mechanics, Rock Mechanics, Groundwater Hydrology EXPLORATORY TEST PIT SOIL LOGS TP—1 0—7' Mixed sand and gravel containing large pieces of wood,including small logs(FILL) 7'-8Y2' Dense yellow to brownish-yellow sandy silt to silty sand,some mottling 8' Hole bottom(no groundwater encountered.) TP-2 0—4' Mixed gravel and sand containing numerous wood fragments(FILL) 4'—5' Dark brown organic soil(topsoil,original ground surface?) 5' Hole bottom(no groundwater en countered.) TP-3 0—7' Mixed gravelly soil containing logs and stumps(FILL) 7'—9' Dark brown organic soil(original topsoil at ground surface?) 9' Hole bottom(no groundwater encountered.) TP-4 0—3' Mixed gravelly soil,(clean FILL) 3'—5' Yellowish-brown silty sand,dense,damp 5' Hole bottom(no groundwater encountered.) TP-5 0—30" Mixed grayish-black gravelly soil(clean FILL) 30"—5' Brown to yellowish-brown silty sand with some gravel 5' Hole bottom(no groundwater encountered.) END.EXPLORATORY TEST PIT SOIL LOGS AML Geotechnical Services, Inc. Soil Mechanics, Rock Mechanics, Groundwater Hydrology Kai- 1 '\ _ i M .,, ..,�'I,' 1 .��,�t� . [f •a ' �� + .x� .T- �.. b' a SMs• K ?ti rp� rR f' a v • 1 } '4. 44 h$ lf I n Y, it i t i�f'. ter, s i t r! e. N Y ."S1`.t' ,gas a ,W--. '- i... ;c X* O•-_ 4.41' as, Y •, 3!y r 7�e iy+..� . ` �+^ te.. as 1 r ' „ ;s ,• .,*- r r - 4_, • .JJ' vi"�< r `...r, fyG t�' /r ^'3 i'�'`GL _.., � } I,r< ��M,�S�� t _-$ ,� ;.�. ..r Facing north across the centrally-located level bench(the proposed building site.) Test Pits excavated here revealed from two to three feet of clean fill. The blackberry-covered slope in the background also contains fill. AML Geotechnical Services, Inc. Soil Mechanics, Rock Mechanics, Groundwater Hydrology r _ v. . s .! 1.-• 4• "fir+ �" '�. � '.^. . m•. \,� ,i\ ^•\` \�. �: d { g. 'lam*.." • y 0 - Spoil from Test Pits excavated in the Southwest corner of the lot. The wood debris visible was found several feet below the existing ground surface. AML Geotechnical Services, Inc. Soil Mechanics, Rock Mechanics, Groundwater Hydrology ::'''''- tA 4 .:ir::4•.4.--ille-ska •'s'‘ -.' .:.1-‘,.;k:t•r*, •,1\ 100 .';. C r ct.� CbY • l „w 1 i.Q � is a • , 1� '", ' ‘,1%,-,0,1...„v-&...14, t.,;,`,. ,-iiltiiii? „..•'..,:i.. •- -..,,' iaf `t4 Cy, y \. x,.: r-',i.i: S ,. '•. ' :7F- S g0/i.4 1 tt' `'7 zra • Akt pis ,.. �.`J`��f w �t V.' Z' * N. i 1 _z.ycF�s' Mgt k,�t:SS•�� ; c �k�r . ...,-.1-:',. ,.. , �+►r.tt.-- , .., coo., y • r 1;<-4... s L r r invi litoliot 't' ' K 'tom ` ' "71 . \� +,` C . A / �. _41,_-. ... see,,,, s...„..„ ao. -,,,itc,K-N1/4 ,4;AN) fr et. Test Pit excavated on top of the bank above the depression in the Southwest corner of the lot. Note the log embedded in the pit wall(the contaminated fill here is about seven feet deep.) AML Geotechnical Services, Inc. Soil Mechanics, Rock Mechanics, Groundwater Hydrology— _ -a Y t`��t ;, •'i+ �, 1' • i r t . v4^ 3 a 54,. 4 -{ + 1 3 C4^� ji . r R.1 , :, ;, 1 f+ ',,� '-2 3. 7"' A .. 7'( Y i.:`,4"- .:., i . . e . 1, Test Pit excavated on top of the bank above the depression in the Southwest corner of the lot. The log visible in the center of the picture was found buried several feet below the surface. AML Geotechnical Services, Inc. Soil Mechanics, Rock Mechanics, Groundwater Hydrology 'F y `. \ I. � _•` tom.• y1�C.••F. . •4 1., ti ( . i , M M * I i cif , A :. i ' 4 • r 1 lr 4,; yfr 2 t _ ( •P ter .�.� revealed about seven feet of contaminated fill(the log visible at center right came out of the fill.) View towards the southwest corner from the center of the level bench. A Test Pit excavated on top of the bank directly above the cedar tree revealed about seven feet of contaminated fill(the log visible at center right came out of the fill.)