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01-101725
r ESAAdolfson J memorandum date June 7, 2007 to Deb Barker, City of Federal Way from Lizzie Zemke, ESA Adolfson 5309 Shilshole Avenue NW Suite 200 Seattle, WA 98107 206.789.9658 phone 206.789.9684 fax subject Residential South Wetland and Sewer Line Monitoring Ri=ci=ivE� � wWf adoffson,corn COMMUNITY 0EVRapMi<,NI VEPAI'il`AIIEN I JUN 0 8 2007 This purpose of this memo is to provide an update regarding estimated costs to complete our review of monitoring reports submitted to date for the Quadrant Residential South project located in the City of Federal Way. As we discussed over the phone earlier this spring (April 13), our review of the monitoring reports for this project has required more than the typical effort for this type of project. This is due to: • The need to reconcile differences between the monitoring dates that were proposed by the applicant before the mitigation work was initiated and the actual dates when the monitoring work has been performed; • The voluminous and confusing hydrology monitoring information provided by the applicant; and ■ Differences between the as -built drawings and actual site conditions observed by ESA Adolfson during our March 2007 site visit. ESA Adolfson has just completed and submitted to the City our review of the following monitoring reports: ■ wetland creation area: as -built (2005) and Year 1 (2006); • sewer line restoration area: as -built (2004) and Year 1 (2005); and • well monitoring: baseline (2003) through Year 2 (2005). As of today, Adolfson has approximately $800 remaining in the combined 2006 budgets for the wetland creation and sewer line restoration reviews. We anticipate that this budget will be used to review the 2006 reports for the sewer line and well data (when Talasaea submits these documents). We have also recommended that Talasaea provide a summary of hydrology data from 2004 through 2006, which will also need to be reviewed. Assuming that we do not need to revisit the site this year, we expect to be able to review these reports within the remaining budget for 2006. However, should an additional site visit or extra coordination with Talasaea be necessary, we anticipate that we would need to request up to another $400 from the City to cover our labor costs. Please let me know if you have any questions. Once we receive the remaining 2006 monitoring reports for review, we will let you know if it appears that an additional site visit or more extensive coordination with Talasaea will be needed to complete our review tasks. 4CITY OF s. Federal April 22, 2009 Mr. Wally Costello Quadrant Corporation PO Box 130 Bellevue, WA 98009 CITY HALL Way 33325 8th Avenue South Mailing Address: PO Box 9718 Federal Way, WA 98063-9718 (253) 835-7000 www.cityoffederalway.com Re: File #01-101725-00-CO; YEAR 6 WETLAND MONITORING REPORT, PROJECT CONCLUSION Weyerhaeuser East Campus Parcel 2/Sewer North Wetland (AKA Northlake Building) Dear Mr. Costello: This letter forwards the March 2009 ESA Adolfson Monitoring Report Year 6 for the Weyerhaeuser East Campus Parcel 2 project and updates the status of the above -referenced wetland project. You may recall that Quadrant contracted with the City to have ESA Adolfson perform the wetland monitoring for the site. Your copy of the report is enclosed. The March 2009 report notes that based on recent inspections, the planting areas have met the noted performance standards. There was no maintenance recommendations for the project and ESA Adolfson recommends that the monitoring period be considered completed. The City concurs with the recommendation in the ESA Adolfson report. No further monitoring is required and the monitoring of this wetland is now concluded for this project. The City will release any remaining wetland monitoring funds following receipt of the final invoices from ESA Adolfson. As no bonds were in place for this project, none will be released. Thank you for successfully completing the monitoring requirements. If you have any questions, please call me at 253-835-2642. Sincerely, Deb Barker Senior Planner enc: Copy of ESA Adolfson -Monitoring Report Year 6, Weyerhaeuser East Campus Parcel 2, dated March 2009 c: Tamara Fix, Administrative Assistant Jana Roy, Quadrant Corporation, PO Box 130, Bellevue, WA 98009 Sara Noland, ESA Adolfson, 5309 Shilshole Avenue NW, Suite 200, Seattle, WA 98107 Doc. I.D. 49778 Deb Barker From: Sara Noland [SNoland@esassoc.com] Sent: Thursday, April 02, 2009 12:37 PM To: Deb Barker Subject: RE: Weyerhaueser Quadrant East Campus Parcel 2 Hi Deb, I visited Transect 1 yesterday and it looks fine. The native plants are doing well, and the weed cover is below 10%. There were dead, cut blackberry canes that must have been from last surnrner's weeding. I will finish up the monitoring report and yet it to you next week. The report will recommend that the project be considered successful in having met the performance standards. Sara From: Deb Barker[ma ilto: Deb. Barker@cityoffederalway.com] Sent: Monday, March 30, 2009 11:29 AM To: Sara Noland Subject: RE: Weyerhaueser Quadrant East Campus Parcel 2 ,Sara •. If yo-u c tL-1-1d chock t; i ; l.rail7ec;, duriTig- ` o.-Ui' Uric' f-i FV'. th.. at W11";, 11d great. '-.` i;pJ,--ng fingc i': �IY�:I.3T:tlt n i r r• I NV ay F-'e ler:al. Way, WA ..18063-11,718 25,'3-835-2;1421 (1)"; --835.26(t9 (f) r �;b.�'�3-1,;r��•Cu<r:itwt�x�'�:z1��r: a? � v.r• .� From: Sara Noland [mailto:SNoland@esassoc.com] Sent: Tuesday, March 24, 2009 4:52 PM To: Deb Barker Subject: RE: Weyerhaueser Quadrant East Campus Parcel 2 Hi Deb, I have the 2008 monitoring report about ready to send to you. To answer your questions, the site met the 85% survival requirement along Transect 3 through replacernent of the dead plants (plus a few extra). Regarding weeds, the percent weed cover was only 1 % along Transect 3, and 5%, along Transect 2. So those two transacts are fine in meeting the 20% max invasive cover requirement. I did not revisit Transect 1 because it is difficult and time consuming to access, and I was focused on Transect 3. So I am not sure what the weed cover was for Transect 1 in 2008, In 2007 it was 18%, so if they didn't do any weeding it may be over the 20% max allowed by now. Were you able to determine whether any weeding was done last year's I will be at the Starkovich site next week, so if needed I could stop by the Quadrant site and check on the weed situation (no charge to the city since I'll be in the area already). The only weed I will really be able to see right now is blackberry, but that's the worst culprit anyrway. Thank you, Sara Noland From: Deb Barker[ma ilto: Deb. Barker@cityoffederalway.com] Sent: Monday, March 09, 2009 9:32 AM To: Sara Noland Subject: RE: Weyerhaueser Quadrant East Campus Parcel 2 K4.'.3"a - Thanks for voirr e.-nnai.lf. 1. haw, a (xYuplcf {3'£ n tS1' ;:i rtt %iF'ds i-£.: :]_:.C£ E `i , :iL:'! {^s 3�'ir� 1i3 i%i iE . .3Y f��.s�%rl £. i�i !r i.iI'd :;i:=t.did3f.}.ti;t. t.ait_?i' ffJTl`..[!.£i''efl:tt?{i'3ja L:f):%f'l'i3.E',, b11• did E.l.£ij%.iF.ic?t?; i..[!.£ ?S<3�i,') :tliY.'V:v2l.l: ).:h(=V ?.i3.f;`;. C3.ixe of the tA.-Sts; Ca:l't Y"?L;i.E'3_i`e 2) 11his, is .-hall aging as :`m nue c;sinc:: that: to see in M�ircb of 2009 we ;at the vr£ e £1 1 j {:, r fir,: i C' ;T,r t� ; �r:.i then- d ! iji : i li { s Y .. --U, that tl:...ti l:it d. not c.£i£ [ who.-ni o—,i r� �S.c.n- in, ?�i-o— . , 008. 1 :13 iz...e ::f e in i:;£, t (Alec.[{: if this 4 ras done. If t h,-, does .not ?'-4100, '` e;.r?L`:.ijig, `1 b-air tmijne of ye-,ir is }.?l- st to :h-al. -w.ik;b; t. - is? If the ii...ivo.ice Ooes; re el-'., %f:edill g, We : ee-d to.knnw if 0.i;?fsta.-iL�oxd S' a's F":.i;_?1- i`r`ba.t1 do vmu .mearl. 1)y cc e. A -q d4 ;'.�� -? a.s v�:9;l.l.l �..[.ip-11-0:l,3% ;t ;.IL?i�' the 20"/-- st3�.fiaa.id",. JWN , 1; f.£7^,.k. forward: to y"U:l_^ i:£)e:i3.33).£'nt s. '�['.fl.a33 ks er-'JE?n tj.i i7iliE? . 251.83,,5•: 6309 (f) WiV.e("J l From: Sara Noland [mailto:SNoland@esassoc.com] Sent: Monday, March 09, 2009 7:57 AM To: Deb Barker Subject: Weyerhaueser Quadrant East Campus Parcel 2 Deb, I got your voice message on Friday about the Quadrant East Campus project. The delay on this one is my fault ... maintenance was done on the site last summer and I visited the site in November 2008. Most of the maintenance items recommended in our December 2007 monitoring report had been completed — there were just a couple of things I wanted to talk with you about: ➢ Quadrant replaced the dead plants along Transect 3 north of the pond as we had recommended. The percent survival requirement has been met. However the woody cover in this area is still low (40%). The performance standards were written to require either 85% survival or 60% cover. Ideally I would ask them to add more shrubs in this area since the cover is low... but I wasn't sure whether the city could ask for this since technically they have met the standard by replacing the dead plants as recommended in our 2007 report. ➢ In the 2007 report I had recommended removing weeds in a couple of areas, and it did not appear in November 2008 that this had been done. The percent weed cover was still slightly below the 20% standard, so again I wasn't sure how much more the city would want to require. Please let me know how you would like to proceed with these items, and I will finish and send you my 2008 monitoring report asap. I apologize for the delay. I will be in the field and in meetings �� .y, but I can give you a call tomorrow (Tue_ }y) if you would like to discuss. I will be checking email late today. Thank you, Sara Noland ESA Adolfson (206) 789-9658 Deb Barker From: Sara Noland [SNoland@esassoc.com] Sent: Monday, March 09, 2009 7:57 AM To: Deb Barker Subject: Weyerhaueser Quadrant East Campus Parcel 2 Deb, I got your voice message on Friday about the Quadrant East Campus project. The delay on this one is my fault ... maintenance was done on the site last summer and I visited the site in November 2008. Most of the maintenance items recommended in our December 2007 monitoring report had been completed — there were just a couple of things I wanted to talk with you about: ➢ Quadrant replaced the dead plants along Transect 3 north of the pond as we had recommended. The percent survival requirement has been met. However the woody cover in this area is still low (40%). The performance standards were written to require either 85% survival or 60% cover. Ideally I would ask them to add more shrubs in this area since the cover is low... but I wasn't sure whether the city could ask for this since technically they have met the standard by replacing the dead plants as recommended in our 2007 report. ➢ In the 2007 report I had recommended removing weeds in a couple of areas, and it did not appear in November 2008 that this had been done. The percent weed cover was still slightly below the 20% standard, so again I wasn't sure how much more the city would want to require. Please let me know how you would like to proceed with these items, and I will finish and send you my 2008 monitoring report asap. I apologize for the delay. I will be in the field and in meetings today, but I can give you a call tomorrow (Tuesday) if you would like to discuss. I will be checking email late today. Thank you, Sara Noland ESA Adolfson (206) 789-9658 MONITORING REPORT YEAR 6 Weyerhaeuser East Campus — Parcel 2 RECEIVED APR 17 2009 CITY OF FEDERAL WAY CDS Prepared for: City of Federal Way 33325 W1 Avenue South Federal Way, Washington 98063 March 2009 F' ESA Adolfson MONITORING REPORT YEAR 6 Weyerhaeuser East Campus — Parcel.2 Prepared for: City of Federal Way 33325 8th Avenue South Federal Way, Washington 98063 March 2009 5309 Shilshole Avenue NW Suite 200 Seattle, WA 98107 206.789.9658 www.adol son.com Los Angeles Oakland Orlando Petaluma Portland Sacramento San Francisco Tampa LSA Adolfson Monitoring Report Year 6 — Weyerhaeuser East Campus = Parcel 2 TABLE OF CONTENTS 1.0 PROJECT AUTHORIZATION AND SCOPE OF WORK.......................................................1 2.0 PROJECT DESCRIPTION...........................................................................................................1 3.0 PERFORMANCE STANDARDS.................................................................................................1 4.0 MONITORING METHODS.........................................................................................................1 5.0 FINDINGS......................................................................................................................................4 5.1 PREVIOUS MAINTENANCE RECOMMENDATIONS ....... ............................................................................ 4 5.2 VEGETATION.........................................................................................................................................4 6.0 PROJECT SUCCESS....................................................................................................................6 7.0 RECOMMENDATIONS...............................................................................................................7 8.0 LIMITATIONS..............................................................................................................................7 9.0 REFERENCES...............................................................................................................................7 ESA Adolfson Page i March 2009 Monitoring Report Year 6 — Weyerhaeuser East Campus — Parcel 2 1.0 PROJECT AUTHORIZATION AND SCOPE OF WORK At the request of the City of Federal Way, ESA Adolfson has conducted a sixth year of monitoring at the Weyerhaeuser East Campus Parcel 2 mitigation site. Annual monitoring visits were required for a total of five years. Because a portion of the mitigation site did not meet the project performance standards at the end of the fifth year, the City required the property owner to fund a sixth year of monitoring. This report summarizes the results of the 2008 monitoring visit (Year 6). 2.0 PROJECT DESCRIPTION Parcel 2 of the Weyerhaeuser Company East Campus site is located at the intersection of Weyerhaeuser Way South and South 320th Street in the City of Federal Way. Talasaea Consultants delineated wetlands along the eastern portion of the site in 1997. Construction of a sewer trunk extension line by the Lakehaven Utility District (District) resulted in disturbance of wetland buffers south of South 320th Street. The District planted five wetland buffer enhancement areas between South 320t" Street and South 336th Street during the year 2000 to mitigate for impacts along the sewer line corridor. Development of an office park on the Parcel 2 site required additional disturbance of portions of the sewer line easement. In 2001, the Quadrant Corporation reached an agreement with the City of Federal Way and the District in which Quadrant agreed to regrade and plant the three northern buffer areas to mitigate for disturbances resulting from development of Parcel 2 (Talasaea, 2001, 2003). Areas disturbed by office park construction, along with some other portions of the sewer easement and buffer, were replanted with native trees and shrubs in 2003. Large woody debris (logs and stumps) was added to the restored buffer areas to increase wildlife habitat. A level spreader was installed to disperse treated runoff from a constructed detention pond into one of the wetlands. The overall goal of the mitigation project was to protect water quality in the wetland and increase wetland functions through buffer enhancement (Talasaea, 2001, 2003). 3.0 PERFORMANCE STANDARDS The following standards were required to be met by the end of the five-year monitoring period in 2007 (Talasaea, 2001, 2003): • 85 percent survival of all planted trees and shrubs, or at least 60 percent areal coverage of combined installed and volunteer woody plants; and • less than 20 percent total cover of exotic and invasive plant species within the enhancement areas. 4.0 MONITORING METHODS Following the initial plant installation by Quadrant in early spring 2003, Talasaea Consultants conducted a baseline assessment and prepared "as -built" drawings for the enhancement areas, as ESA Adolfson Wage 1 March 2009 MonitoriM Report Year 6 — Weyerhaeuser East Campus — Parcel 2 described in the Wetland Buffer Enhancement Plan Baseline Assessment Report (Talasaea, 2003). During the baseline assessment, Talasaea established three monitoring transects and three photopoints to be used during subsequent monitoring years (Figure 1). The City of Federal Way requested that ESA Adolfson conduct one annual site visit during Year 3 (2005), Year 4 (2006), and Year 5 (2007) of the monitoring period. Following the methods established in the Baseline Assessment Report, ESA Adolfson completed the following monitoring tasks during each of these years: • Wildlife: Readily observable wildlife species were identified and recorded during each monitoring visit. Direct observations included actual sightings, while indirect observations included tracks, scat, nests, or song. Any breeding or nesting activities were noted. • Hydrology and Water Quality: General observations were made regarding water quality, erosion, and slope stability. • Photopoints: Photographs were taken from the three established photopoints shown in Figure 1. • Vegetation: Plant survival and areal coverage of woody species were recorded along each of the three 100-foot-long established transects shown in Figure 1. The percent cover of woody vegetation (trees and shrubs) was recorded using the line -intercept method. The percent survival of installed plants was estimated by counting the numbers of live and dead trees and shrubs within each transect. Coverage by herbaceous species and non-native species was visually estimated within each transect. ■ Maintenance: Recommended maintenance actions that would help the enhancement areas progress toward the success standards were noted. The City requested ESA Adolfson to complete an extra year of monitoring after a portion of the site near Transect 3 failed to meet its performance standards at the end of Year 5. The focus of the Year 6 monitoring, completed in fall 2008, was the planting area around Transect 3. This is the area that did not meet performance requirements for native woody cover or plant survival in 2007. In 2008, ESA Adolfson also evaluated overall conditions of the planting areas surrounding the other two transects and whether the maintenance recommendations from the Year 5 report had been completed by Quadrant. ESA Adolfson March 2009 Page 2 lu i r i { r II LEVEL SPREADERv (see &-Y11 Flazi Seta -,Pe7LA�D A-7_..__ ' ij II I f r � ,- - _--- --__________--- k ETLAND- E '�. `� 1 ! ilr� T _ - _ 1 ��j i'!�'•iy • 'PS=• - -- VL I LA %'[�of��•• •� • �i • �a � }ter ••r.r it �'��1r, �.• •T �,• ~�, �� �. i-{ R� A, 7 *`.��- .�►' ,.��yy r -: fly° ■l`_ � �' ;,�•.-.•.- tom F - - Y�.-F r _ •ter •. ` r r v� � �'r ■■+ _ '.� •� t � •f;" law • fr�iLAND D v&`TLAND C. — PLAN LEOEND -- PROPERTY LINE PROPOSED CONTOUR T~# vE6ETATTON TRANSEGT LOCATION PHOTO -POINT LOCATION NOTE: Base Information provided by E5M Consulting Engineers, Federal Way, Hashington. Source plan was modified by Talasaea Consultants for V15UOI enhancement. 11 f Rom• l�yr�� :+.w'•t.. �_=� �."+aF i. o'� Illll 11 1:7 �S 1C.�' 1 'A ;`�:- } O 75 150 300 North iced from Wetland Buffer Enhancement Plan, Baseline Assessment Weyerhaeuser East Campus = Parcel 2; Talasaea Consultants, Inc., TALASAEA CONSULTANTS, TLC Ilet =e& £mvim meal tl PIMMMS t5@L Bcr,�r 11m6 T7mllw� 4vuvdinrUl�,oVnLingimi�tRT1 Bw(42-j R61.7550-F=(4Z) MR-7344 E16UIZE h- Vegetatlon Tran5ects and Photo -points Weyerhaeuser Fast 'Campus -- Parcel 2 Federal Way, Washington DESIGN I DRAWN DATE I r7� © �Fn'nG�t-TuFasaeoCortsnitmis.Ll.0 Monitoring Report Year 6 —Weyerhaeuser East Campus — Parcel 2 5.0 FINDINGS ESA Adolfson biologist Sara Noland conducted the Year 6 monitoring visit on November 11, 2008. The findings are discussed below. 5.1 Previous Maintenance Recommendations ESA Adolfson had previously recommended the following maintenance actions for the areas around Transect 3 (ESA Adolfson, 2007): 1. Remove the silt fence between the northern and southern cells of the detention pond. 2. Replace dead trees along and near Transect 3 to improve the percent survival and woody cover along this transect, which did not meet the success standards in Year 5. 3. Manually remove Himalayan blackberry from Transect 1. 4. Manually remove tansy ragwort, thistle, Scot's broom, and Himalayan blackberry from the slope area above the level spreader. The percent cover of these invasive species was less than the 20 percent standard but was recommended to prevent these weeds from spreading into the adjacent wetland and buffer. 5. Remove stakes from installed trees to avoid further damage to the tree trunks. 6. Block unauthorized access to the service road south of the detention pond to prevent illegal dumping. During the November 2008 site visit, we observed that all of these recommendations had been completed except for item #4, removal of invasive species on the slope above the level spreader. 5.2 Vegetation The survival of installed shrubs and trees along Transect 3 in 2007 was 56 percent. Due to this low survival rate, and a correspondingly low percent woody cover (21 percent), Quadrant replaced dead plants near this transect as recommended in the 2007 monitoring report. The new plants were installed in the enhancement area near but not intersecting the transect. Because the replacement plants did not intersect Transect 3, these plants did not change the percent cover directly along the transect compared to 2007. Therefore, collecting percent cover data using the line -intercept method (as was done in previous years) would not have provided an accurate estimate of overall cover within the enhancement area. Instead, in 2008 we made a visual estimate of overall percent vegetation cover in the planting area around Transect 3, including both the transect itself and the surrounding enhancement area where the new plants had been added. Estimated cover percentages for 2008 are shown in the table below. ESA Adolfson Page 4 March 2009 Monitorin,g Report Year 6 — Weyerhaeuser East Campus — Parcel 2 Percent Cover Annual Summary, Transect 3 Area, Year 6 (2008) Native Shrubs/Trees 40% Invasive Species 1% Ground Cover 95% The replacement plantings are visible in the photos below (new plants are staked). In 2007, ESA Adolfson observed 12 dead plants along Transect 3, including Pacific dogwood, Oregon grape, Douglas fir, and western red cedar. In November 2008, we observed that 19 new plants had been added, including 5 western red cedar, 9 Douglas fir, 2 black cottonwood, 1 big -leaf maple, 1 red alder, and 1 vine maple. As the photos illustrate, the overall woody cover within the Transect 3 enhancement area was still fairly low in fall 2008 (40 percent) including both new plantings and those installed in 2003. Grasses were well established and no bare soils were visible. Invasive species cover was minimal in this area. The new plantings appeared healthy and well spaced throughout the area. Photo 1. Overview of Transect 3 area looking SW, November 2008. ESA Adolfson Page S March 2009 Monitoring Report Year 6 — Weyerhaeuser East Campus — Parcel 2 Photo 2. Close- up of Transect 3 area looking northeast, November 2008. New plants are staked. The other planting areas (Transects 1 and 2) met the performance standards for the project in 2007. Plants in these areas were still healthy in fall 2008, and invasive species cover was minimal (less than 10 percent). 6.0 PROJECT SUCCESS The following standards were required to be met by the end of the five-year monitoring period in 2007 (Talasaea, 2001 and 2003): ■ 85 percent survival of all planted trees and shrubs, or at least 60 percent areal coverage of combined installed and volunteer woody plants; and ■ less than 20 percent total cover of exotic and invasive plant species within the enhancement areas. The enhancement area north of the pond (Transect 3) continues to have low woody cover (40 percent in 2008 compared to the performance standard of 60 percent). However, due to the installation of 19 trees and shrubs to replace 12 dead trees and shrubs that were observed in 2007, the site has exceeded the requirement for 85 percent survival of planted trees and shrubs. Non- native invasive species cover near Transect 3 (1 percent) was well below the 20 percent maximum allowed. The other planting areas (Transects 1 and 2) previously met the cover and survival standards during Year 5 (2007). General observations indicated that plants in these areas were still healthy ESA Adolfson Page 6 March 2009 Monitoring Report Year 6 — Weyerhaeuser haeuser East Cam tts — Parcel 2 and growing in November 2008. Non-native invasive species cover near these transects was less than 10 percent. 7.0 RECOMMENDATIONS We have no further maintenance recommendations for the project. The planting areas have met the performance standards. The property owner has completed our previous maintenance recommendations, with the exception of removing non-native invasive species on the slope near Transect 2. However, invasive species cover was well below the maximum allowed in 2008 and additional weed removal efforts, while desirable for the long-term future of the site, are not strictly required. We recommend that the City consider the project a success and the monitoring period complete. 8.0 LIMITATIONS It is recognized that determining the success of buffer enhancement areas is an inexact science, as individuals will often disagree on the functional level or value of an enhancement area. Typically, enhancement success is "demonstrated" by achieving the success criteria proposed in the plan. However, functionally valuable areas may be restored or enhanced that do not meet some or all of the success criteria outlined therein. Likewise, areas may be restored or enhanced that meet all approved success criteria but are not functionally valuable. The final determination of restoration success is the responsibility of the permit agencies. Within the limitations of schedule, budget, and scope -of -work, we warrant that this monitoring study was conducted in accordance with generally accepted restoration monitoring practices. The results and conclusions of this report represent actual measurements as well as the authors' best professional judgment. No other warranty, expressed or implied, is made. 9.0 REFERENCES ESA Adolfson. 2007. Monitoring Report Year S — Weyerhaeuser East Campus Parcel 2. Prepared for City of Federal Way. December 2007. Talasaea Consultants, LLC. 2001. Wetland Buffer Enhancement Plan Weyerhaeuser East Campus — Parcel 2, Federal Way, Washington. Prepared for Quadrant Corporation, December 10, 2001. Talasaea Consultants, LLC. 2003. Wetland Buffer Enhancement Plan Baseline Assessment Report Weyerhaeuser East Campus — Parcel 2, Federal Way, Washington. Prepared for Quadrant Corporation, April 11, 2003. ESA Adolfson Page 7 March 2009 a CITY OF CITY HALL -FILE Federal Way 33325 Sth Avenue South Mailing Address: PO Box 9718 Federal Way, WA 98063-9718 (253) 835-7000 www.cityoffederalway.com February 11, 2009 Quadrant Corporation Attn: Mr. Wally Costello PO Box 130 Bellevue, WA 98009 RE: FILE #01-101725-00-CO; WETLAND MONITORING AND MAINTENANCE -YEAR 5 Weyerhaeuser Sewer North Wetland (AKA Northlake Building) Dear Mr. Costello: This letter responds to the February 2, 2009, inquiry from Jenna Roy with your office as to the status of the monitoring and maintenance of the above -referenced wetland project. As noted in my January 8, 2008 letter, the monitoring period for the Weyerhaeuser Sewer North Wetland project was extended an additional year when the city's wetland consultant ESA Adolfson determined that the project site has not achieved performance objectives due to failure to complete maintenance tasks noted in previous years' reports. I am aware that the requested additional funding for 6t` year monitoring was received on May 15, 2008.' However, before I authorize ESA Adolfson to return to monitor the site, I'd like to have verification that the maintenance tasks identified in the year 3 and 4 reports have been performed. A copy of the December 2007 ESA Adolfson Year 5 monitoring report is enclosed for reference. Please notify me in writing when the maintenance recommendations noted on page 4 and 5 of their monitoring report are completed. We appreciate your cooperation in the completion of this wetland monitoring and maintenance. I can be reached at 253-835-2642 if you have any questions about this letter or the required actions. Sincerely, Deb Barker Senior Planner enc: ESA Adolfson Monitoring Report Year 5, Weyerhaeuser East Campus Parcel 2, December 2007 c: Sara Noland, ESA Adolfson, 5309 Shilshole Ave NW, Suite 200, Seattle, WA 98107 I $2,284.75 was received for ESA Adolfson to provide year 6 monitoring. Doc. I.D. 49040 DRAFT February 11, 2009 Quadrant Corporation Attn: Mr. Wally Costello PO Box 130 Bellevue, WA 98009 RE: FILE #01-101725-00-CO; WETLAND MONITORING AND MAINTENANCE -YEAR 5 WEYERHAEUSER SEWER NORTH WETLAND (AKA NORTHLAKE BUILDING) Dear Mr. Costello: This letter responds to the February 2, 2009 inquiry from Jenna Roy with your office as to the status of the monitoring and maintenance of the above referenced wetland project. As noted in my January 8, 2008 letter, the monitoring period for the Weyerhaeuser Sewer North Wetland project was extended an additional year when the city's wetland consultant ESA Adolfson determined that the project site has not achieved performance objectives due to failure to complete maintenance tasks noted in previous years reports. I am aware that the requested additional funding for 6"' Year monitoring was received on May 15, 2008.1 However, before I authorize ESA Adolfson to return to monitor the site, I'd like to have verification that the maintenance tasks identified in the year 3 and 4 reports have been performed. A copy December 2007 ESA Adolfson Year 5 monitoring report is attached for reference. Please notify me in writing when the maintenance recommendations noted on page 4 and 5 of their monitoring report are completed. We appreciate your cooperation in the completie reached at 253-835-2642 if you have any questic Sincerely, Deb Barker Senior Planner enc: C. ESA Adolfson Monitoring Report Year 5, Sara Noland, ESA Adolfson, 5309 Shilshole 1 $2,284.75 was received for ESA Adolfson to provide year 6 monitoring. can be Doc. I.D. 49040 MONITORING REPORT YEAR 5 Weyerhaeuser East Campus — Parcel 2 Prepared for: City of Federal Way 33325 8th Avenue South Federal Way, Washington 98063 December 2007 5309 Shilshole Avenue NW Suite 200 Seattle, WA 98107 206.789.9658 vnvw.adollson.com Los Angeles Oaldand Orlando Petaluma Portland Sacramento San Francisco Tampa ESAAdolfson Monitoring Report Year S — W �_)aeuser East Campus — Parcel 2 1 TABLE OF CONTENTS 1 1.0 PROJECT AUTHORIZATION -AND SCOPE OF WORK.......................................................1 2.0 PROJECT DESCRIPTION..........................................................................................................1 3.0 PERFORMANCE STANDARDS.................................................................................................1 4.0 1 5.0 MONITORING METHODS.........................................................................................................1 FINDINGS......................................................................................................................................2 5.1 WILDLIFE..............................................................................................................................................2 -1 5.2 HYDROLOGY AND WATER QUALITY I 5.3 VEGETATION ................................. ..................................................................................................... 3 6.0 PROJECT SUCCESS....................................................................................................................4 7.0 MAINTENANCE RECOMMENDATIONS...............................................................................4 8.0 LIMITATIONS..............................................................................................................................5 1 9.0 REFERENCES...............................................................................................................................5 FIGURES APPENDIX A - PHOTOS _ i APPENDIX B - MONITORING DATA I I I 1 I I JESA Adolfson Page i December 2007 Monitoring Report Year 5 — Wei )aeuser East Campus —Parcel 2 1.0 PROJECT AUTHORIZATION AND SCOPE OF WORK At the request of the City of Federal Way, ESA Adolfson has conducted the fifth year of monitoring at the Weyerhaeuser East Campus Parcel 2 mitigation site. Annual monitoring visits have been conducted for a total of five years. This report summarizes the results of the 2007 monitoring visit (Year 5). 2.0 PROJECT DESCRIPTION Parcel 2 of the Weyerhaeuser Company East Campus site is located at the intersection of Weyerhaeuser Way South and South 320th Street in the City of Federal Way. Talasaea Consultants delineated wetlands along the eastern portion of the site in 1997. Construction of a sewer trunk extension line by the Lakehaven Utility District (District) resulted in disturbance of wetland buffers south of South 320th Street. The District planted five wetland buffer enhancement areas between South 320t' Street and South 336t' Street during the year 2000 to mitigate for impacts along the sewer line corridor. Development of an office park on the Parcel 2 site required additional disturbance of portions of the sewer line easement. In 2001, the Quadrant Corporation reached an agreement with the City of Federal Way and the District by which Quadrant agreed to regrade and plant the three northern buffer areas to mitigate for disturbances resulting from development of Parcel 2 (Talasaea, 2001 and 2003). Areas disturbed by office park construction, along with some other portions of the sewer 1 easement and buffer, were replanted with native trees and shrubs in 2003. Large woody debris (logs and stumps) was added to the restored buffer areas to increase wildlife habitat. A level spreader was installed to disperse treated runoff from a constructed detention pond into one of the wetlands. The overall goal of the mitigation project was to protect water quality in the wetland and increase wetland functions through buffer enhancement (Talasaea, 2001 and 2003). i 3.0 PERFORMANCE STANDARDS The following standards are to be met by the end of the five-year monitoring period in 2007 (Talasaea, 2001 and 2003): 85 percent survival of all planted trees and shrubs, or at least 60 percent areal coverage of combined installed and volunteer woody plants; and less than 20 percent total cover of exotic and invasive plant species within the enhancement areas. 4.0 MONITORING METHODS Following the initial plant installation by Quadrant in early spring 2003, Talasaea Consultants conducted a baseline assessment and prepared "as -built" drawings for the enhancement areas, as described in the Wetland Buffer Enhancement Plan Baseline Assessment Report (Talasaea, 2003). During the baseline assessment, Talasaea established three monitoring transects and three photopoints to be used during subsequent monitoring years (Figure 1). ESA Adolfson Page 1 December 2007 J Monitoring Report Year S — We ~ ,l aeuser East Campus — Parcel 2 The City of Federal Way has requested that ESA Adolfson conduct one annual site visit during Year 3 (2005), Year 4 (2006), and Year 5 (2007) of the monitoring period. Following the methods established in the Baseline Assessment Report, ESA Adolfson completed the following monitoring tasks each year: -� • Wildlife: Readily observable wildlife species are identified and recorded during each monitoring visit. Direct observations include actual sightings, while indirect observations include tracks, scat, nests, or song. Any breeding or nesting activities are noted. • Hydrology and Water Quality: General observations are made regarding water quality, erosion, and slope stability. ■ Photopoints: Photographs are taken from the three established photopoints shown in Figure 1. Vegetation: Plant survival and areal coverage of woody species are recorded along each of the three established transects shown in Figure 1. Each transect is 100 feet long. The percent cover of woody vegetation (trees and shrubs) is recorded using the line -intercept method. The percent survival of installed plants is estimated by counting the numbers of live and dead trees and shrubs within each transect. Coverage by herbaceous species and non-native species are visually estimated within each transect. • Maintenance: Recommended maintenance actions that will help the enhancement areas progress toward the success standards are noted. 5.0 FINDINGS ESA Adolfson biologists Sara Noland and Rachel Hulscher conducted the Year 5 monitoring 1 visit on October 31, 2007. The Year 5 findings are discussed below. Representative photographs taken from the three photopoints are provided in Appendix A. 5.1 Wildlife During the fall 2007 site visit, small bird species such as kinglets, bushtits, and dark -eyed juncos j were observed in the buffer near the detention pond. In addition, a red-tailed hawk and a raven were sighted flying over the site. Tree frogs were also heard on site. Mountain beaver den holes and activity were observed in areas of salal near Transect 1. Additional bird, small mammal, and invertebrate species likely use the enhancement areas and nearby habitats at other times of day or in other seasons. 5.2 Hydrology and Water Quality Y 9Y Y Water was present in both cells of the detention pond during the October 2007 site visit (Appendix A, Photo 1). The previously reported damaged silt fence between the northern and southern cells of the detention pond has not been removed. No water was present in the level ESA Adolfson Page 2 1 December 2007 MonitoriM Report Year 5 — We _ �aeuser East Campus — Parcel 2 spreader during the fall 2007 site visit. Shrubs have become well established in the area around the level spreader and no evidence of erosion was observed (Appendix A, Photo 2). 5.3 Vegetation The survival of installed shrubs and trees along Transects 1 and 3 was 97 percent and 56 percent, respectively, in 2007. The percent survival is unchanged from fall 2006. No additional dead plants were observed in either transect. Due to the presence of numerous native volunteer trees and shrubs (red -osier dogwood, willow, and red alder), the location and number of installed plants along Transect 2 could not be determined in 2007. Detailed vegetation monitoring data for the three line -intercept transects are provided in Appendix B. The table below shows a summary of the average percent cover for Year 5 (2007). The percentages shown represent the average of the native installed vegetation and non-native invasive totals collected from the three monitoring transects. Percent Cover Annual Summary, Year 5 (2007) Percent Cover Transect Native Shrubs/Trees Invasive Species 1 67 18 2 66 5 3 21 8 Averages 51 10 During Year 5, the average cover of native installed woody vegetation was 51 percent based on monitoring data from all three transects. Transect 1 had 67 percent woody cover based on 2007 monitoring data, compared to 28 percent woody cover in 2006. This dramatic increase in growth was likely due to the plants becoming established and the wet, mild summer of 2007 which promoted vigorous growth. Overall herbaceous cover along Transect 1 was 83 percent, and non-native invasive cover was 18 percent (see Appendix A, Photo 3). Transect 2 during this site visit had 66 percent woody cover (Appendix A, Photo 4). This is similar to the percent cover observed in 2006 of 67 percent. Like Transect 1, this area has well established native shrubs and trees. Herbaceous cover in Transect 2 was 107 percent and non- native invasive cover was 5 percent during 2007. Transect 3 showed the least amount of average cover for woody species at only 21 percent, which is essentially the same as during 2006. Herbaceous cover was 100 percent, and non-native invasive cover was 8 percent (Appendix A, Photo 5). Within the transects the dominant trees and shrubs included snowberry, Douglas fir, Oregon grape, willow, red -osier dogwood, and western red cedar. ESA Adolfson Page 3 December 2007 Monitoring Report Year 5 — We �aeuser East Campus — Parcel 2 Non-native invasive species cover in 2007 was less than 10 percent in Transects 2 and 3; non- native invasive cover was 18 percent in Transect 1. The average non-native cover for all three -1 transects during 2007 (10 percent) has increased from the 2006 average of 3 percent. Transect 1 showed the largest increase from 10 percent to 18 percent invasive vegetation coverage. Transects 2 and 3 also had substantial increases in invasive vegetation cover, both increasing from zero in 2006 to 5 percent and 8 percent in 2007, respectively. While no success standards are in place for herbaceous vegetation, ground cover was also monitored to provide another measure of how the enhancement areas are progressing. j Herbaceous cover ranged from 83 percent to 107 percent during the fall 2007 site visit (see Appendix B). This is comparable to the coverage observed in 2006 where herbaceous species 1 cover ranged from 90 to 100 percent along the three transects. Dominant species included bentgrass and red fescue. 6.0 PROJECT SUCCESS Based on the above Year 5 findings, the enhancement areas south and east of the detention pond (Transects 1 and 2) have met the Year 5 performance standards of 85 percent survival of all planted trees and shrubs, or at least 60 percent areal coverage of combined installed and volunteer woody plants. As reported in the Year 4 (2006) monitoring report, the area north of the pond (Transect 3) {} continues to have low survival of installed trees and shrubs, and low woody cover (56 percent 1 survival and 21 percent woody cover in 2007). This does not meet the requirement for 85 percent survival of all planted trees and shrubs, or at least 60 percent areal coverage of combined installed and volunteer woody plants. Also as reported last year, illegal dumping of landscape debris was observed on the service road south of the detention pond. The removable access barrier timbers were not in place at the time of the site visit. 7.0 MAINTENANCE RECOMMENDATIONS ESA Adolfson again recommends the following maintenance actions at the Parcel 2 site: Remove the silt fence between the northern and southern cells of the detention pond. • Replace dead trees along and near Transect 3. This will improve both the percent survival and woody cover along this transect, which did not meet the success standards for the final year. We recommend that the City extend the monitoring period for this transect for one year following replanting. Manually remove Himalayan blackberry from Transect 1. Manually remove tansy ragwort, thistle, Scot's broom, and Himalayan blackberry from the slope area above the ESA Adolfson Page 4 December 2007 1 Monitoring Report Year S — W _ taeuser East Campus —Parcel 2 1 level spreader. Care should be taken when removing weeds in this area to avoid causing erosion of the slope. While the overall percent cover of invasive species was less than the 20 percent success standard this year, this action will help to prevent these weeds from spreading into the adjacent wetland and buffer. • Remove stakes from installed trees to avoid further damage to the tree trunks. • Block unauthorized access to service road south of the detention pond to prevent illegal dumping. 8.0 LIMITATIONS It is recognized that determining the success of buffer enhancement areas is an inexact science, as individuals will often disagree on the functional level or value of an enhancement area. Typically, enhancement success is "demonstrated" by achieving the success criteria proposed in the plan. However, functionally valuable areas may be restored or enhanced that do not meet some or all of the success criteria outlined therein. Likewise, areas may be restored or enhanced that meet all approved success criteria but are not functionally valuable. The final determination of restoration success is the responsibility of the permit agencies. Within the limitations of schedule, budget, and scope -of -work, we warrant that this monitoring study was conducted in accordance with generally accepted restoration monitoring practices. The results and conclusions of this report represent actual measurements as well as the authors' best professional judgment. No other warranty, expressed or implied, is made. 9.0 REFERENCES Talasaea Consultants, LLC. 2001. Wetland Buffer Enhancement Plan Weyerhaeuser East Campus — Parcel 2, Federal Way, Washington. Prepared for Quadrant Corporation, December 10, 2001. Talasaea Consultants, LLC. 2003. Wetland Buffer Enhancement Plan Baseline Assessment Report Weyerhaeuser East Campus — Parcel 2, Federal Way, Washington. Prepared for Quadrant Corporation, April 11, 2003. J J ESA Adolfson December 2007 J Page S Monitoring Report Year S — W iaeuser East Campus — Parcel 2 ESA Adolfson December 2007 FIGURES --j I I� Q m N O i AN 5 N c � O � W L N {, c W IL L Qi c j 6 IL i � IL tl OD M. Monitoring Re ort Year S — We;aeuser East Campus — Parcel 2 1 1 APPENDIX A PHOTOGRAPHS -� ESA Adolfson December 2007 41P � r z' " "Vrt: F ,y � ' . JV�Rr �y • s I'' p Mw' �Y • 4. Monitoring Report Year S —Weyerhaeuser East Campus —Parcel 2 I Photo 3. Showing Transect 1 during October 31, 2007 site visit. I I I I IPhoto 4. Showing Transect 2 during the October 31, 2007 site visit. I ESA Ado y'son JDecember 2007 Monitoring RTort Year S — Weyerhaeuser East Campus — Parcel 2 i I I 1 Photo 5. Looking south over Transect 3 during the October 31, 2007 site visit. Photo 6. Looking north over Transect 3 during the October 31, 2007 site visit. ESA AdoO'son December 2007 1 —) Monitoring Report Year S — We—saeuser East Campus —Parcel 2 =I w ESA Adolfson December 2007 APPENDIX B MONITORING DATA Weyerhaeuser Parcel 2 Site, Plant Survival 10-31-07 Plant Species Transect 1 Transect 3 Alive Dead Alive Dead .Acer circinatum 'Vine maple 1 .Acer macro h llum Big -leaf maple 1 Corpus nuttallii Pacific dogwood 1 1 2 Corpus stolonifera Red -osier dogwood Cratae us s . Hawthorne 2 ,Holodiscus discolor Oceanspray 1 Mahonia a uifolium Oregon grape 3 6 8** Oemleria cerasiformis Indian plum 5 Prunus emar inata Bitter cher 1 ,Pseudotsu a menziesii Douglas fir 2 1 ,gibes sap uineum Red currant 3 Rosa s_D. Rose 2 1 Salix s . Willow Sorbus s . Mountain ash 1 S m horicarpos a/bus Snowber 10 1 Thu'a plicata Western red cedar 2 1 1.41nus rubra Red alder 1 Totals* Percent Survivalll 29 1 15 12 97 56 * Totals do not reflect individual salal plants along Transect 1, which were too numerous to count. ** Only 2 dead Oregon grape were located in 2007; the remaining 6 dead plants observed in 2006 are assumed to have decomposed but are still included in the dead plant total. Survival count not performed for Transect 2 due to high percentage woody cover (native shrubs too numerous to count). Quadrant Year 5 Data.xis 12/17/2007 vine maple_ Douglas fir Indian plum Indian plum snowberry bia-leaf mat Douglas fir snowberry snowberry rose Indian plum Indian plum Oregon grape Oregon gray salal bentgrass hairvl cat's-ear Himalayan blac evergreen blacl Scots Broom Canada Thistle butterfly bush St. John's Wort Weyerhaeuser Parcel 2 Site, Percent Cover Data, 10-31-07 Transect 1 S ecies Acer circinatum Pseudotsuga menziesii Oemleria cerasiformis Oemleria cerasiformis S mphoricarpos albus Acermacrophyllum S mphoricarpos albus S mphoricarpos albus Symphoricarpos albus Pseudotsu a menziesii S m horicar os albus S m horicar os albus Rosa sp. Oemleria cerasiformis Oemleria cerasiformis Mahonia a uifolium Mahonia a uifolium Gau/theria shallon Herbaceous _Hypochaeris radicata Rubus ursinus Rubus discolor Rubus lacinatus _Cytisus scopariu Cirsium arvense Buddlela davidii Invasive Start Measurement (ft) End Measurement (ft) 0 2 7.5 16 17.5 22 23 25 28 34 0 0 38 40 57 60 61.5 66 64.5 72.5 0 0 0 0 72 79.5 80 81.5 85.5 87 93.5 96 97 100 visual estimate Total Woody Cover Total Herbaceous Cover Total Invasive % Cover 2.00 8.50 4.50 2.00 6.00 0.00 2.00 3.00 4.50 8.00 0.00 0.00 7.50 1.50 1.50 2.50 3.00 10.00 67 Percent Cover 80 1 2 83 Percent Cover 10 2 2 1 2 1 18 Quadrant Year 5 Data.xls 2 of 4 12/17/2007 Weyerhaeuser Parcel 2 Site, Percent Cover Data, 10-31-07 Transect 2 Woody Species S ecies Start Measurement (ft) End Measurement (ft) % Cover willow Salix sp. 3 15 12.00 red -osier dogwood Corpus stolonifera 17 19 2.00 red -osier dogwood Corpus stolonifera 21 22 1.00 red -osier dogwood Corpus stolonifera 23 24 1.00 red -osier dogwood Corpus stolonifera 25.5 28 2.50 red -osier dogwood Corpus stolonifera 29 30 1.00 willow 1 Salix sp. 45 70.5 25.50 red -osier dogwood Corpus stolonifera 72 73 1.00 red -osier dogwood Corpus stolonifera 75 76 1.00 willow Salix sp. 81 100 19.00 Total Woody Cover 66 Herbaceous Species Species Percent Cover bentgrass A rostis s . 75 lupine Lupinus sp. 5 soft rush Juncus effusus 2 red fescue Festuca rubra 10 hairy cat's-ear Hypochaefis radicata 10 St. John's Wort yypericum perforatum 1 clover Trifolium sp. 1 Shasta daisy Leucanthemum x su erbum 3 Total Herbaceous Coverl 107 Invasive Species Scots Broom C isus sco arius 5 Total Invasive Coverl 5 Quadrant Year 5 Data.xls 3 of 4 12/17/2007 Weyerhaeuser Parcel 2 Site, Percent Cover Data, 10-31-07 Transect 3 Woody Species S ecies Start Measurement (ft) End Measurement (ft) % Cover hawthorne Cratae us sp. 3.5 4.5 1.00 Oregon grape Mahonia a uifolium 13.1 14.3 1.20 hawthorne Crataegus sp. 16 19 3.00 Rose Rosa s . 45.5 46.5 1.00 Oregon grape Mahonia a uifolium 62.5 64 1.50 western red cedar Thu'a plicata 61 68.5 7.50 western red cedar Thuia plicata 1 76 79.5 3.50 red currant Ribes sanguineum 84 86 2.00 Total Woody Cover 21 Herbaceous Species Species Percent Cover common velvetgrass Holcus lanatus 5 bentgrass jAgmstis sp. 45 red fescue Festuca rubra 45 trailing blackberry Rubus ursinus 5 Total Herbaceous Cover 100 invasive Species reed canary grass Phalaris Arundinacea 2 -curly Dock Rumex cris us 1 Himalayan blackberry Rubus amenicus 2 tansy ragwort Senecio 'acobaea 2 prickly sow thistle Sonchus arvensis 1 Total Invasive Cover 8 Quadrant Year 5 Data.xls 4 of 4 12/17/2007 FILE '�kCITY OF Federal Way January 8, 2008 Quadrant Corporation Attn: Mr. Wally Costello PO Box 130 Bellevue, WA 98009 CITY HALL 33325 8th Avenue South Mailing Address: PO Box 9718 Federal Way, WA 98063-9718 (253) 835-7000 www.cityoffederalway com RE: File #01-101725-00-CO; WETLAND MONITORING AND MAINTENANCE - YEAR 5 Northlake Building, 32032 Weyerhaeuser Way South, Federal Way Dear Mr. Costello: As we discussed earlier this month, the City has been provided copies of the Year 5 Wetland Monitoring Report — Weyerhaeuser East Campus Parcel 2 (AKA Northlake Building). Quadrant has contracted with the City to have ESA Adolfson perform the wetland monitoring for the site. Your copy of the report is enclosed. Unfortunately, this report notes that none of the identified maintenance actions identified in the year 3 and year 4 reports were completed by Quadrant. Without these maintenance actions, the site has not achieved its performance standards. As noted in previous letters to you, failure to complete the maintenance actions results in the failure of the performance of the mitigation and portends other requirements for the project site. Therefore, based on this failure, the monitoring period for this site is hereby extended for a period of one year, and shall expire on January 31, 2009. In order to fund the 6`h year monitoring by ESA Adolfson, and as based on the enclosed estimate dated January 8, 2008, payment fee in the amount of $2,284.75 must be submitted as soon as possible. We appreciate your cooperation in the completion of this wetland monitoring and maintenance. I can be reached at 253-835-2642 if you have any questions about this letter or the required actions. Sincerely, Deb Barker Senior Planner enc: ESA Adolfson Monitoring Report Year 5, Weyerhaeuser East Campus Parcel 2, December 2007 ESA Task Authorization dated January 8, 2008 c: Will Appleton, Public Works Development Services Manager Sara Noland, ESA Adolfson, 5309 Shilshole Ave NW, Suite 200, Seattle, WA 98107 Doc 1 D 43572 ,�.. M C I A".1 as , r1y S - �L•. c �i � rF R '_f i : ' w ti �. !. � �• �� .icy . MONITORING REPORT YEAR 4 Weyerhaeuser East Campus — Parcel 2 I I 1 Prepared for: City of Federal Way 33325 8111 Avenue South Federal Way, Washington 98063 November 2006 I I 5309 Shilshole Avenue NW Suite 200 Seattle, WA 98107 206.789.9658 uwvw.adolEsot].[�fn J Los Angeles Oaldand Orlando J Petaluma Portland Sacramento San Francisco Tampa j ESA Ad o o j Monitoring Report Year, 4 — We�—)aeuser East Campus — Parcel 2 TABLE OF CONTENTS .1 1.0 PROJECT AUTHORIZATION AND SCOPE OF WORK.......................................................1 2.0 PROJECT DESCRIPTION.......................................................................................................... I 3.0 PERFORMANCE STANDARDS.................................................................................................1 4.0 MONITORING METHODS.........................................................................................................I 5.0 FINDINGS......................................................................................................................................2 5.1 WILDLIFE...........................................................................................................................................2 �l 5.2 HYDROLOGY AND WATER QUALITY..............................................................................................2 5.3 VEGETATION......................................................................................................................................3 5.4 MAINTENANCE RECOMIVIENDATIONS............................................................................................. 4 6.0 LIMITATIONS..............................................................................................................................4 7.0 REFERENCES...............................................................................................................................5 1 FIGURES J APPENDIX A REPRESENTATIVE PHOTOGRAPHS l APPENDIX B MONITORING DATA j ESA Adolfson November 2006 Page i Monitoring Report Year 4 — We, l aeuser East Campus — Parcel 2 --1 i 1.0 PROJECT AUTHORIZATION AND SCOPE OF WORK At the request of the City of Federal Way, ESA Adolfson has conducted the fourth year of monitoring at the Weyerhaeuser East Campus Parcel 2 mitigation site. Annual monitoring visits will be conducted for a total of five years. This report summarizes the results of the 2006 monitoring visit (Year 4). 2.0 PROJECT DESCRIPTION Parcel 2 of the Weyerhaeuser Company East Campus site is located at the intersection of Weyerhaeuser Way South and South 320th Street in the City of Federal Way. Talasaea Consultants delineated wetlands along the eastern portion of the site in 1997. Construction of a sewer trunk extension line by the Lakehaven Utility District (District) resulted in disturbance of wetland buffers south of South 320th Street. The District planted five wetland buffer enhancement areas between South 320th Street and South 336th Street during the year 2000 to mitigate for impacts along the sewer line corridor. Development of an office park on the iParcel 2 site required additional disturbance of portions of the sewer line easement. In 2001, the Quadrant Corporation reached an agreement with the City of Federal Way and the District by 1 which Quadrant agreed to regrade and plant the three northern buffer areas to mitigate for disturbances resulting from development of Parcel 2 (Talasaea, 2001 and 2003). Areas disturbed by office park construction, along with some other portions of the sewer easement and buffer, were replanted with native trees and shrubs in 2003. Large woody debris (logs and stumps) was added to the restored buffer areas to increase wildlife habitat. A level spreader was installed to disperse treated runoff from a constructed detention pond into one of the wetlands. The overall goal of the mitigation project was to protect water quality in the wetland and increase wetland functions through buffer enhancement (Talasaea, 2001 and 2003). 1 3.0 PERFORMANCE STANDARDS The following standards are to be met by the end of the five-year monitoring period in 2007 1 (Talasaea, 2001 and 2003): i J _J • 85 percent survival of all planted trees and shrubs, or at least 60 percent areal coverage of combined installed and volunteer woody plants; and ■ less than 20 percent total cover of exotic and invasive plant species within the enhancement areas. 4.0 MONITORING METHODS Following the initial plant installation by Quadrant in early spring 2003, Talasaea Consultants conducted a baseline assessment and prepared as -built drawings for the enhancement areas, as described in the Wetland Buffer Enhancement Plan Baseline Assessment Report (Talasaea, 2003). During the baseline assessment, Talasaea established three monitoring transects and three photopoints to be used during subsequent monitoring years (Figure 1). ESA Adolfson Page I November 2006 Monitoring Report Year 4 — We )aeuser East Campus —Parcel 2 1 The City of Federal Way has requested that ESA Adolfson conduct one annual site visit during Year 3 (2005), Year 4 (2006), and Year 5 (2007) of the monitoring period. Following the methods established in the Baseline Assessment Report, ESA Adolfson is completing the following monitoring tasks each year: j • Wildlife: Readily observable wildlife species are identified and recorded during each monitoring visit. Direct observations include actual sightings, while indirect observations include tracks, scat, nests, or song. Any breeding or nesting activities are noted. • Hydrology and Water Quality: General observations are made regarding water quality, erosion, and slope stability. • Photopoints: Photographs are taken from the three established photopoints shown in Figure 1. • Vegetation: Plant survival and areal coverage of woody species are recorded along each of the three established transects shown in Figure 1. Each transect is 100 feet long. The percent cover of woody vegetation (trees and shrubs) is recorded using the line -intercept method. The percent survival of installed plants is estimated by counting the numbers of live and dead trees and shrubs within each transect. Coverage by herbaceous species and non-native species are visually estimated within each transect. ■ Maintenance: Recommended maintenance actions that will help the enhancement areas progress toward the success standards are noted. 5.0 FINDINGS ESA Adolfson biologists Sara Noland and Margaret deGravelle conducted the Year 4 monitoring visit on September 21, 2006. The Year 4 findings are discussed below. Representative j photographs taken from the three photopoints are provided in Appendix A. 5.1 Wildlife Wildlife species directly observed during the fall 2006 monitoring visit included tree frog, American robin, great blue heron, and other songbirds. The bullfrogs observed last fall were not found in the detention pond during the September 2006 site visit. Indirect observations included various woodpecker excavations in snags and coyote and deer scat. Additional bird, small mammal, and invertebrate species likely use the enhancement areas and nearby habitats at other times of day or in other seasons. 1 5.2 Hydrology and Water Quality 1 J Water was present in both cells of the detention pond during the September 2006 site visit (Appendix A, Photo 1). The previously reported damage to the silt fence between the northern and southern cells of the detention pond has not been repaired. No water was present in the level ESA Adolfson Page 2 November 2006 J Monitoring Report Year 4 — W )aeuser East Campus — Parcel 2 spreader during the fall 2006 site visit. Shrubs have become well established in the area around the level spreader and no evidence of erosion was observed (Appendix A, Photo 2). 5.3 Vegetation The survival of installed shrubs and trees along Transects 1 and 3 was 97 percent and 56 percent, respectively, in 2006. Several additional dead trees were observed near but just outside of Transect 3. Due to the presence of numerous volunteer trees and shrubs (red -osier dogwood, willow, and red alder), the location and number of installed plants along Transect 2 could not be determined in 2006. Detailed vegetation monitoring data for the three line -intercept transects are provided in Appendix B. The table below shows a summary of the average percent cover for Year 4 (2006). The percentages shown represent the average of the native installed vegetation and non-native invasive totals collected from the three monitoring transects. Percent Cover Annual Summary, Year 4 (2006) Percent Cover Transect Shrubs/Trees Invasive Species 1 28 10 2 75 0 3 1 20 1 0 Averages 41 3 During Year 4, the average cover of native installed woody vegetation was 41 percent based on monitoring data from all three transects. Transect 1 had 28 percent woody cover based on 2006 1 monitoring data, compared to 50 percent woody cover in 2005. This difference appears due to early leaf fall because of the summer 2006 drought. Overall visual estimates indicate the cover in the area of Transect 1 is closer to 50 percent, similar to last year (see Appendix A, Photo 3). J Transect 2 had the highest level of shrub and tree cover, with numerous volunteer alders present (Appendix A, Photo 4). Similar to the percent survival data mentioned above, the lowest woody cover was observed along Transect 3 (Appendix A, Photo 5). Other dominant trees and shrubs along the three transects included snowberry, Douglas fir, Oregon grape, willow, red -osier dogwood, and western red cedar. Many of the installed trees had been staked at the time of installation. ESA Adolfson biologists removed stakes from the trees in Transect 1 during the September 2006 site visit. The stakes are no longer necessary and the remaining stakes were removed to prevent damage to the trees. Non-native invasive species cover was low within the three transects. However, a dense patch of tansy ragwort, thistle, Scot's broom, and Himalayan blackberry was noted on the slope above the level spreader. Himalayan blackberry is beginning to encroach on Transect 1. ESA Adolfson Page 3 November 2006 Monitoring Report Year 4 — Wey �)aeuser East Cam us — Parcel 2 While no success standards are in place for non -noxious herbaceous vegetation, ground cover was also monitored to provide another measure of how the enhancement areas are progressing. As shown in Appendix B, herbaceous species cover ranged from 90 to 100 percent along the three transects. Dominant species included bentgrass and red fescue. 5.4 Maintenance Recommendations Based on the above Year 4 findings, the enhancement areas south and east of the detention pond (Trsects 1 and 2) are progressing toward the Year 5 performance standards. The area north of the pond (Transect 3) continues to have low survival and woody cover, and is unlikely to meet the performance standards by next year unless actions are taken. It appears that the previous year's monitoring report (2005) recommendations were not implemented. Illegal dumping of landscape debris was observed on the service road south of the detention pond. The removable access barrier timbers were not in place at the time of the site visit. ESA Adolfson again recommends the following maintenance actions at the Parcel 2 site: Remove the silt fence between the northern and southern cells of the detention pond. • Replace dead trees along and near Transect 3. This will improve both the percent survival and woody cover along this transect, which were well below the success standards both last year and this year. Manually remove Himalayan blackberry from Transect 1. Manually remove tansy ragwort, thistle, Scot's broom, and Himalayan blackberry from the slope area above the level spreader. Care should be taken when removing weeds in this area to avoid causing erosion of the slope. While the overall percent cover of invasive species was less than the 20 percent success standard this year, this action will help to prevent these weeds from spreading into the adjacent wetland and buffer. • Remove stakes from installed trees to avoid further damage to the tree trunks. • Block unauthorized access to service road south of the detention pond to prevent illegal dumping. 6.0 LIMITATIONS It is recognized that determining the success of buffer enhancement areas is an inexact science, as individuals will often disagree on the functional level or value of an enhancement area. Typically, enhancement success is "demonstrated" by achieving the success criteria proposed in the plan. However, functionally valuable areas may be restored or enhanced that do not meet some or all of the success criteria outlined therein. Likewise, areas may be restored or enhanced that meet all approved success criteria but are not functionally valuable. The final determination of restoration success is the responsibility of the permit agencies. ESA Adolfson Page 4 November 2006 MonitoriM Report Year 4 — W�aeuser East Campus — Parcel 2 Within the limitations of schedule, budget, and scope -of -work, we warrant that this monitoring study was conducted in accordance with generally accepted restoration monitoring practices. The results and conclusions of this report represent actual measurements as well as the authors' best professional judgment. No other warranty, expressed or implied, is made. 7.0 REFERENCES Talasaea Consultants, LLC. 2001. Wetland Buffer Enhancement Plan Weyerhaeuser East �j Campus — Parcel 2, Federal Way, Washington. Prepared for Quadrant Corporation, December 10, 2001. Talasaea Consultants, LLC. 2003. Wetland Buffer Enhancement Plan Baseline Assessment Report Weyerhaeuser East Campus — Parcel 2, Federal Way, Washington. Prepared for Quadrant Corporation, April 11, 2003. J J J J J J J ESA Adolfson JNovember 2006 Page 5 Monitoring Report Year 4 — Weyerhaeuser East Campus — Parcel 2 FIGURES ESA Adolfson November 2006 ... _.. _. .__. pgE,!_Arm.E --`., --• j Y 71 • �/-� � � of ,i /� ! '� 1�.�� ��� — _ ___ � °it'��' ��` '� � ��y.--_*•-r-•-.+�•r-�`;=1 �-�r.� _° - r r • �� � I \ r•- � ,i{F�{� ' i�,� yam._ = =- ." .' 21* y y` ��� .�� _` ��.•. It _ '!N..�� it �� • r r f �s w DffragnON �i• r•s.- r.s.w .`yr : a�. •• - � 77 I L` —� �%v.�r.... c fil_� [� � � - I•r .:•� •y N. .......... ... is - - - . - _ _ �'�' • - 'r `:�. � •��;���� r !�••i� �-^ �` - ��rr Yam' ', ••� OR M hEiLAhID F �: �� -. YETL4ND D WETLAND G PROPOSED GONTOUR r— vEoerAT1oN TRAN9EGT LOGAvoN PHOTO -POINT LOCATION NOTE: Base 1nFormatlon provided by E5M Gonsviting Engineers, Federal Way, Washington. Source plan was modifled by Talasaea Gon5ultant5 for V15UOI enhancement. a 1 f I ill Plan_-= _�- _ 1 RHPEUSER1,4Y 5:.. AF,r- IIIII`•- Nil i: - 1 ;•�' f ' J� .. i4 !: . r• - { : - i rf.4- 1 I� 1 o 15 150 5 0 North Reproduced from Wetland Buffer Enhancement Plan, Baseline Assessment Report, Weyerhaeuser East Campus - Parcel 2; Talasaea Consultants, Inc., April 112003 DESIGN ❑F Fi6URE I: TALASAELC Vegetation Tran9PGt5 and Photo oint5 f i UE CONSULTANTS, LLC 9 f = 1,50. & Cmvin==lal rlatmmg Weyerhaeuser East 'Gampus -- Parcel 2 ATE R Fsazn a�ct�rnnaaxa�u,� wv"[Mvulgw=b[nE1=9RM zevlsEn Fu.(425) A6l•75i0-Fzt(42.5)961•7549 Federal Hay, l,-lashington QC Capvngbt-Tiilasa=aCmisult=tsr(1.0 Monitoring Re ort Year 4 — W erhaeuser East Cam us —Parcel 2 APPENDIX A PHOTOGRAPHS ESA Adolfson November 2006 Monitoring Report Year 4 — We erizaeuser East Campus — Parcel 2 I 11 I I 1 I I I I I I j Photo 1. Looking south over detention pond (9-21-06). Photo 2. Looking down slope toward level spreader near Photopoint 2 (9-21-06). jESA Adolfson November 2006 Monitoring Report Year 4 — Weyerhaeuser East Campus — Parcel 2 1 1 1 Photo 5. Looking south from north end of Transect 3 at Photopoint 3 (9-21-06). I I I j I I jESA Adolfson November 2006 Monitoring Report Year 4 — Wgerhaeuser East Campus — Parcel 2 APPENDIX B MONITORING DATA ESA Ado fson November 2006 Weyerhaeuser Parcel 2 Site, Plant Survival 9-21-06 Plant Species Transect 1 Transect 3 Alive Dead Alive Dead .Acercircinatum Vine maple 2 ,Acer macro h llum Big -leaf maple 1 ,Corpus nuttallii Pacific dogwood 1 1 2 ,Cornus stolonifera Red -osier dogwood Cratae us s . Hawthorne 2 ,Holodiscus discolor Oceanspray 1 Mahonia a uifolium Oregon grape 3 6 8 �Oemleria cerasiformis Indian plum 5 ,Prunus emar inata Bitter cherry ,Pseudotsu a menziesii Douglas fir 2 1 ,gibes sap uineum Red currant 3 ,Rosa s . Rose 2 1 Salix s . Willow Sorbus s . Mountain ash 1 S m horicar os albus Snowberry 11 1 Thu a plicata Western red cedar 2 1 Alnus rubra Red alder 1 Totals* Percent Survival 30 1 15 12 97 56 * Totals do not reflect salal plants along Transect 1, which were too numerous to count. Survival count not performed for Transect 2 due to high percentage woody cover (native shrubs too numerous to count). Quadrant Year 4 Data.xls 11/9/2006 Weyerhaeuser Parcel 2 Site, Percent Cover Data, 9-21-06 5umma of Transects 1 through 3 100' Transect Percent Cover Native Woody Species Non -Native Invasive Species 1 28 10 2 75 0 3 20 1 0 Averages 41 1 3 Transect 1 Woody Species S ecies start Measurement (ft) End Measurement (ft) % Cover vine maple Acer circinatum 0 1 1 Douglas fir Pseudotsu a menziesii 9.8 12.2 2.4 Indian plum Oemleria cerasiformis 16.2 16.8 0.6 Indian plum Oemleria cerasiformis 19.7 20.4 0.7 snowberry S m horicar os albus 27.2 27.4 0.2 big -leaf maple Acermacro h llum 27.8 28.4 0.6 snowberry S m horicar os albus 28.7 30.2 1.5 snowberry S m horicar os albus 31.2 32.2 1 snowberry S m horicar os albus 32.5 34.5 2 snowber S m horicar os albus 53.7 56.9 3.2 snowberry S m horicar os albus 61.3 63 1.7 rose Rosa s . 72.2 74 1.8 Indian plum Oemleria cerasiformis 77.4 80.3 2.9 Oregon grape Mahonia a uifolium 95.8 98.2 2.4 Oregon grape Mahonia a uifolium 99.2 100 0.8 salal Gaultheria shallon visual estimate 5 Total Woody Cover 28 Herbaceous Species Species Percent Cover bent rass I.Agrostis s . 80 hairy cafs- I Hypochaeris radicata 5 Total Herbaceous Cover 85 Invasive Species Species Percent Cover Himalayan blackberry Rubus discolor 5 evergreen blackberry Rubus lacinatus 5 Total Invasive Cover 10 Quadrant Year 4 Data.xls 1 of 3 11/9/2006 Weyerhaeuser Parcel 2 Site, Percent Cover Data, 9-21-06 Transect 2 WoodyS pecies Species Start Measurement (ft) End Measurement (ft) % Cover willow Salix sp. 0 7.4 7.4 red alder Alnus rubra 7.4 14.4 7 willow Salix s . 14.4 15.7 1.3 red alder Alnus rubra 15.7 23.5 7.8 red -osier dogwood Corpus stolonifera 24.5 35.5 11 red alder Alnus rubra 35.5 36 0.5 red -osier dogwood Corpus stolonifera 36 37 1 red alder Alnus rubra 37 39 2 willow Salix s . 39 41.5 2.5 willow Salix s . 44 49.5 5.5 red -osier dogwood Corpus stolonifera 52 52.5 0.5 willow Salix s . 52.5 55.6 3.1 red -osier dogwood Corpus stolonifera 63.3 68.6 5.3 red -osier dogwood Corpus stolonifera 70 75 5 red -osier dogwood Corpus stolonifera 78 81.3 3.3 willow Salix s . 84.5 85 0.5 red alder Anus rubra 89 91 2 willow Salix s . 91 1 100 1 9 Total Woody Cover 75 Herbaceous Species Species I Percent Cover bentgrass A rostis s . 50 lupine Lu inus s . trace soft rush Juncus effusus 5 red fescue Festuca rubra 35 hairy cat's-ear H-Vpochaeris radicata trace Total Herbaceous Cover 90 Invasive Species none Total Invasive Cover 0 Quadrant Year 4 Data.xls 2 of 3 11/9/2006 Weyerhaeuser Parcel 2 Site, Percent Cover Data, 9-21-06 Transect 3 Woody Species S ecies Start Measurement (ft) End Measurement (ft) % Cover hawthorne Cratae us sp. 4 8 4 Oregon grape Mahonia a uifolium 13.4 13.8 0.4 hawthorne Cratae us s . 16.4 20.6 4.2 western red cedar Thu'a plicata 61.5 67.8 6.3 western red cedar Thu'a plicata 76.4 79 2.6 red currant Ribes san uineum 82.7 85.2 2.5 Total Woody Cover 20 Herbaceous Species Species Percent Cover common velvetgrass Holcus lanatus 5 bentgrass A rostis s . 75 red fescue Festuca rubra 10 trailing blackberry Rubus ursinus 10 Total Herbaceous Coverl 100 Invasive Species none Total Invasive Coverl 0 Quadrant Year 4 Data.xls 3 of 3 11/9/2006 I FILE AkCITY 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 16, 2007 Quadrant Corporation, Attn: Mr. Wally Costello PO Box 130 Bellevue, WA 98009 RE: File #01-101725-00-CO; WETLAND MONITORING AND MAINTENANCE - YEAR 4 Northlake Building, 32032 Weyerhaeuser Way South, Federal Way Dear Mr. Costello: Enclosed is a copy of the Wetland Monitoring Report Year 4 — Weyerhaeuser East Campus Parcel 2 (AKA Northlake Building). Quadrant has contracted with the City to have Adolfson Associates Inc.` perform the wetland monitoring for the site. The year 4 monitoring report identifies five maintenance actions that need to be completed by Quadrant. The report notes that four of these actions were recommended in the Year 3 monitoring report, but were never implemented. These maintenance actions must be addressed as soon as possible to help the site achieve its performance standards. Please advise me when these maintenance items have been completed, and we will have ESA Adolfson re -inspect the site this spring to close out the year 4 monitoring. We appreciate your cooperation in the completion of this wetland monitoring and maintenance. Failure to complete these maintenance action items may result in failure of the performance of wetland buffer mitigation and additional requirements for the project site.. I can be reached at 253-835-2642 if you have any questions. I will be out of the office February 28 through March 26, 2007. In my absence, please contact Greg Fewins at 253-835-2611. Sincerely, Deb Barker Senior Planner enc: ESA Adolfson Monitoring Report Year 4, Weyerhaeuser East Campus Parcel 2, November 2006 c: Will Appleton, Public Works Development Services Manager I Adolfson recently changed their name to ESA Adolfson. Doc. I D. 39778 CffY OF G 33530 1ST WAY SOUTH February 27, 2003 Ann Olsen Talasaea Consultants, LLC. 15020 Bear Creek Road NE Woodinville, WA 98072 RE: Wetland Buffer Enhancement FILE Parcel 2/Northlake Office Building 32032 Weyerhaeuser Way South Federal Way File Nos. 01-100739-00UP, 01-100740-OOSE & 01-101725-OOCO Dear Ms. Olsen, (206)661-4000 FEDERAL WAY, WA 98003-6210 Based on a site inspection on February 13, 2003 and subsequent conversation with your landscape contractor, the wetland buffer enhancement plan plantings have been completed consistent with the approved plan dated December 10, 2001. Please submit an as -built drawing of the buffer enhancement. Also, since the Projected Calendar for Performance Monitoring and Maintenance Events is based on earlier completion and inspection dates, please submit an updated calendar starting with the Baseline Assessment at Winter 2002/2003. To date, the performance bond or other financial guarantee referenced in Section 8.0 of the Wetland Buffer Enhancement Plan has yet to be submitted. The implementation (planting) component of the wetland buffer enhancement has been completed, thus no financial guarantee is needed for that component. However, since the monitoring will be an ongoing requirement, a bond or other financial guarantee to ensure that the monitoring occurs is required and must be submitted to the City, consistent with the approved plan. Additionally, the City is in the process of having its wetland consultant prepare a scope to review the yearly monitoring reports to be provided. Upon completion, the scope will be forwarded to the applicant (Quadrant) for funding. If you should have any questions regarding this letter or the development project, please feel free to call me at 206.297.2106, or Greg Fewins, Community Development Deputy Director, at the City of Federal Way, at 253.661.4108. Sincerely, Da`aid Graves, AICP Contract Senior Planner Madonna Planning & Development Services cc: Jeff Roberts, Quadrant, P.O. Box 130, Bellevue, WA 98009 Greg Fewins, Deputy Director File A�kCITY OF Federal February 2, 2006 Quadrant Corporation Attn: Mr. Wally Costello PO Box 130 Bellevue, WA 98009 FILE CITY HALL Way 33325 8th Avenue South • PO Box 9718 Federal Way, WA 98063-9718 (253) 835-7000 www.cityoffederalway.com Re: Permit #01-101725-000-00-CO; WETLAND MONITORING AND MAINTENANCE Northlake Building, 32032 Weyerhaeuser Way South, Federal Way Dear Mr. Costello: Enclosed is a copy of the Wetland Monitoring Report Year 3 - Weyerhaeuser East Campus Parcel 2. Quadrant has contracted with the City to have Adolfson Associates Inc (AAI) perform the wetland monitoring for the site. The year 3 monitoring report identifies four maintenance items that need to be completed by Quadrant. The maintenance items should be addressed soon in order to install plantings during the appropriate planting season. Please have these maintenance items completed, and we will have AAI re -inspect the site this spring to close out the year 3 monitoring. Please let me know when the maintenance items are completed. We appreciate your cooperation in the completion of this wetland monitoring and maintenance. If you have any questions, please contact me at jim.harris@cityoffederalway_com or 253-835-2641. Sincerely, t 'LJ v'1 n Hams Senior Planner enc: AAI Monitoring Report Year 3 Weyerhaeuser East Campus Parcel 3 C' William Appleton, Public Works Development Services Manager 01-I0I725 Doc I D :4958 MONITORING REPORT YEAR 3 WEYERHAEUSER EAST CAMPUS - PARCEL 2 FEDERAL •WAY, WASHINGTON PREPARED FOR: CITY OF FEDERAL WAY 33325 8TH AVE SOUTH PO Box 9718 FEDERAL WAY, WASHINGTON 98063 DECEMBER 2005 PREPARED BY: Adolfson Associates, Inc. 5309 Shilshole Ave NW, Ste 200 Seattle, Washington 98107 206.789.9658 December 15, 2005 Mr. Jim Harris Senior Planner City of Federal Way 33325 8th Ave South PO Box 9718 Federal Way, WA 98063 Environmea-al Sol-1LGlons GOMMLINI7Y "EVELOPM NT DEPARTMENT DEC 1 6 2005 Subject: Year 3 Monitoring Report, Weyerhaeuser East Campus — Parcel 2 (Northlake Building) Dear Mr. Harris: Enclosed are two copies of the Year 3 monitoring report for the Weyerhaeuser East Campus — Parcel 2 project near the Northlake Building. Adolfson conducted the work under Task Authorization 23005 #86B. Page 4 of the monitoring report recommends some maintenance actions including limited replanting to help the site achieve its performance standards. Please call me if you have any questions about our findings or recommendations for this year. Sincerely yours, ADOLFSON ASSOCIATES, INC. Sara Noland Project Scientist ADOLFSON ASSOCIATES, INC. 5309 Shilshole Avenue NW, Suite 200 Seattle, WA 98107 7( 206 789 9658 ywK 206 789 9684 ada son�ado son{am Year 3 Monitoring Report - Weyerhaeuser East Cam us — Parcel 2 TABLE OF CONTENTS TABLEOF CONTENTS............................................................................................................................I 1.0 PROJECT AUTHORIZATION AND SCOPE OF WORK.......................................................I I 2.0 PROJECT DESCRIPTION..........................................................................................................1 3.0 PERFORMANCE STANDARDS.................................................................................................1 4.0 MONITORING METHODS.........................................................................................................1 -� 2 5.0 FINDINGS...................................................................................................................................... 2 5.1 WILDLIFE............................................................................................................................................. 5.2 HYDROLOGY AND WATER QUALITY.................................................................................................... 3 3 l 5.3 VEGETATION........................................................................................................................................ 4 5.4 MAINTENANCE RECOMMENDATIONS................................................................................................... 4 6.0 LIMITATIONS.............................................................................................................................. 7.0 REFERENCES...............................................................................................................................5 FIGURES APPENDIX A REPRESENTATIVE PHOTOGRAPHS APPENDIX B MONITORING DATA I I I j Adolfson Associates, Inc. Page i JDecember 2005 Year 3 Monitoring Report - We erhaeuser East Campus Parcel 2 1.0 PROJECT AUTHORIZATION AND SCOPE OF WORK At the request of the City of Federal Way, Adolfson Associates, Inc. (Adolfson) has conducted the third year of monitoring at the Weyerhaeuser East Campus Parcel 2 mitigation site. Annual monitoring visits will be conducted for a total of five years. This report summarizes the results of the 2005 monitoring visit (Year 3). 2.0 PROJECT DESCRIPTION Parcel 2 of the Weyerhaeuser Company East Campus site is located at the intersection of Weyerhaeuser Way South and South 320th Street in the City of Federal Way. Talasaea Consultants delineated wetlands along the eastern portion of the site in 1997. Construction of a sewer trunk extension line by the Lakehaven Utility District (District) resulted in disturbance of wetland buffers south of South 320th Street. The District planted five wetland buffer enhancement areas between South 320th Street and South 336th Street during the year 2000 to mitigate for impacts along the sewer line corridor. Development of an office park on the Parcel 2 site required additional disturbance of portions of the sewer line easement. In 2001 the Quadrant Corporation reached an agreement with the City of Federal Way and the District by which Quadrant agreed to regrade and plant the three northern buffer areas to mitigate for disturbances resulting from development of Parcel 2 (Talasaea, 2001 and 2003). Areas disturbed by office park construction, along with some other portions of the sewer easement and buffer, were replanted with native trees and shrubs. Large woody debris (logs and stumps) was added into the restored buffer areas to increase wildlife habitat. A level spreader was installed to disperse treated site runoff from a constructed detention pond into one of the wetlands. The overall goal of the mitigation project was to protect water quality in the wetland and increase wetland functions through buffer enhancement (Talasaea, 2001 and 2003). 3.0 PERFORMANCE STANDARDS The following standards are to be met by the end of the five-year monitoring period (Talasaea, 2001 and 2003): s 85 percent survival of all planted trees and shrubs, or at least 60 percent areal coverage of combined installed and volunteer woody plants; and • less than 20 percent total cover of exotic and invasive plant species within the enhancement areas.- 4.0 MONITORING METHODS Following the initial plant installation by Quadrant in early spring 2003, Talasaea Consultants conducted a baseline assessment and prepared as -built drawings for the enhancement areas, as described in the Wetland Buffer Enhancement Plan Baseline Assessment Report (Talasaea, Ailolfson Associates, Inc. Page 1 J December 2005 Year 3 Monitoring Report - Weyerhaeuser East Campus — Parcel 2 2003). During the baseline assessment, Talasaea established three monitoring transects and three photopoints to be used during subsequent monitoring years (Figure 1). The City of Federal Way has requested that Adolfson conduct one annual site visit during Year 3 (2005), Year 4 (2006), and Year 5 (2007) of the monitoring period. Following the methods established in the Baseline Assessment Report, Adolfson is completing the following monitoring tasks each year: 1 + Wildlife: Readily observable wildlife species are identified and recorded during each 1 monitoring visit. Direct observations include actual sightings, while indirect observations include tracks, scat, nests, or song. Any breeding or nesting activities are noted. + Hydrology and Water Quality: General observations are made regarding water quality, erosion, and slope stability. • Photopoints: Photos are taken from the three established photopoints shown in Figure 1. + Vegetation: Plant survival and areal coverage of woody species are recorded within each of the three established transects shown in Figure 1. Each transect is 100 feet long and 10 feet wide. The percent cover of woody vegetation (trees and shrubs) is recorded using the line -intercept method. The percent survival of installed plants is estimated by counting the numbers of live and dead trees and shrubs within each transect. Coverage by herbaceous species and non-native species are visually estimated within each transect. One of the transects (Transect 1) could not be relocated and its location was estimated during 2005. + Maintenance: Recommended maintenance actions that will help the enhancement areas progress toward the success standards are noted. 5.0 FINDINGS Adolfson biologist Sara Noland conducted the Year 3 monitoring visit on October 21, 2005. The Year 3 findings are discussed below. Representative photographs taken from the three photopoints are provided in Appendix A. 5.1 Wildlife 1 Wildlife species directly observed during the fall 2005 monitoring visit included tree frog, dark - eyed junco, northern flicker, Steller's jay, and numerous bull frogs in the detention pond. Indirect observations included woodpecker excavations in snags, and coyote scat. Additional bird, small mammal, and invertebrate species likely use the enhancement areas and nearby habitats at other times of day or in other seasons. l J Adolfson Associates, Inc. Page 2 JDecember 2005 Year 3 Monitoring Report - Weyerhaeuser East Campus — Parcel 2 5.2 Hydrology and Water Quality Water was present in both cells of the detention pond during the October 2005 site visit (Appendix A, Photo 1). A portion of the silt fence between the northern and southern cells of the detention pond was observed to be damaged (Appendix A, Photo 2). No water was present in the level spreader during the fall 2005 site visit. Shrubs have become well established in the area around the level spreader and no evidence of erosion was observed (Appendix A, Photo 3). 5.3 Vegetation Detailed vegetation monitoring data for the three line -intercept transects are provided in Appendix B. When all three transects are added together, the survival of installed shrubs and trees totaled 92 percent during 2005. However, most of the dead plants were observed along Transect 3, which by itself had only 70 percent survival. Several additional dead trees were observed near but just outside of Transect 3. The table below shows a summary of the average percent cover for Year 3 (2005). The percentages shown represent the average of the native installed vegetation and non-native invasive totals collected from the three monitoring transects. Percent Cover Annual Summary, Year 3 (2005) Percent Cover Transect Shrubs/Trees Invasive Species 1 50 4 2 60 2 3 26 0 Average 45 2 �I During Year 3, the average cover of native installed woody vegetation was 45 percent based on monitoring data from all three transects. Transects 1 and 2 had the highest level of shrub and tree coverage, with numerous volunteer alders present along Transect 2 (Appendix A, Photos 4 and 5). Similar to the percent survival data mentioned above, the lowest woody cover was observed along Transect 3 (Appendix A, Photo 6). Other dominant trees and shrubs along the three transects included snowberry, Douglas fir, Oregon grape, willow, red -osier dogwood, and western red cedar. Many of the installed trees had been staked in the past to prevent leaning; it appeared the stakes are no longer necessary. Non-native invasive species cover was low within the three transects. However, a dense patch of tansy ragwort, thistle, and Himalayan blackberry was noted outside of the monitoring transects, on the slope above the level spreader. 1 Adolfson Associates, Inc. Page 3 December 200E I S Year 3 Monitorin Report - Weyerhaeuser East Campus — Parcel 2 While no success standards are in place for herbaceous vegetation, ground cover was also -, monitored to provide another measure of how the enhancement areas are progressing. As shown in Appendix B, herbaceous species cover ranged from 90 to over 100 percent along the three transects. Dominant species included bentgrass, common velvetgrass, clover, red fescue, and lupine. 5.4 Maintenance Recommendations Based on the above Year 3 findings, the enhancement areas are progressing toward the Year 5 performance standards. Adolfson recommends the following maintenance actions at the Parcel 2 site: ■ Remove the silt fence between the northern and southern cells of the detention pond. • Replace dead trees along and near Transect 3. This will improve both the percent survival and woody cover along this transect, which were well below the success standards this year. • Manually remove tansy ragwort, thistle, and Himalayan blackberry from the slope area above the level spreader. Care should be taken when removing weeds in this area to avoid causing erosion of the slope. Weed seed heads should be bagged and disposed offsite. While the overall percent cover of invasive species was less than the 20 percent success standard this year, this action will help to prevent these weeds from spreading into the adjacent wetland and buffer. • Remove remaining stakes from installed trees to avoid further damage to the tree trunks. 6.0 LIMITATIONS l It is recognized that determining the success of buffer enhancement areas is an inexact science, as J individuals will often disagree on the functional level or value of an enhancement area. Typically, enhancement success is "demonstrated" by achieving the success criteria proposed in the plan. However, functionally valuable areas may be restored or enhanced that do not meet -� some or all of the success criteria outlined therein. Likewise, areas may be restored or enhanced that meet all approved success criteria but are not functionally valuable. The final determination of restoration success is the responsibility of the permit agencies. -j Within the limitations of schedule, budget, and scope -of -work, we warrant that this monitoring J study was conducted in accordance with generally accepted restoration monitoring practices. The results and conclusions of this report represent actual measurements as well as the authors' best professional judgment. No other warranty, expressed or implied, is made. Adolfson Associates, Inc. Page 4 `� December 2005 ttt Year 3 Monitorin Report - We erhaeuser Earcel 2 7.0 REFERENCES Talasaea Consultants, LLC. 2001. Wetland Buffer Enhancement Plan Weyerhaeuser East Campus — Parcel 2, Federal Way, Washington. Prepared for Quadrant Corporation, December 10, 2001. Talasaea Consultants, LLC. 2003. Wetland Buffer Enhancement Plan Baseline Assessment Report Weyerhaeuser East Campus — Parcel 2, Federal Way, Washington. Prepared for Quadrant Corporation, April 11, 2003. Adolfson Associates, Inc. Page S December 2005 Year 3 Monitoring Report - Weyerhaeuser East Campus — Parcel 2 'I FIGURES Adolfson Associates, Inc. December 2005 II ► i y! r 1 ' [see Cds[I Plan set) il . _y�v �J } E:1 1: f r . 1. ` .•.�. �r� _�p'}i`,'+e�r.�.��_ _ _�.w l� ice. �, •�� _:�•-ti.,,^.'-+-. '�'�Z i 1.\ �� - ` + .� ryf' �....-_ _>—�- ,�rT. {'� •�Y �_ _ _'`�+...r__ ^.ter •. �✓ ' ✓L { GN1 1Ort �+ ]: Y .: ].• t t r ' I tip: ! �y�.� ! Ml 70 • _'` "', �y+_ 'h--.-• � tit - � • � , IT YerLfantD F OR Y,ETLAND D WETLAND G PLAN, LE-0-17-ND -- — PROPERTY LINE PROPOSED CONTOUR T-# vE6ETATION TRAN9ECT LocA-noN }gyp-# PHOTO --POINT LOCATION NOTE: Base Information provided N E5M Gonsulting Engineers, Federal Way, Washington. Source plan -was modified by Talasaea Gonsultants for visual enhancement. A. I RHAEU55-R -1AY-- 5. 1 --�,'�-•'•'i-1ir�-C =r,-`.-•jay ' �tr� '�~ ty r : Yr`- Ti�w �`: tom- . --r-'-• _-7a: �, . ^� [I11- le C .y 46 ILU :.� I� 1 j } 0 15 150 500 North Reproduced from Wetland Buffer Enhancement Plan, Baseline Assessment Report, Weyerhaeuser East Campus - Parcel 2; Talasaea Consultants, Inc., ril 11 1003 TALASAEA CONSULTANTS, LLC Iimamr & imvitvmneatal PI=nm6 15a2a a�a�nnaa 77o>fh� WondlnAlq Wmhln2mn 9RO72 Dtu(425) R61-7550-Fa(425) 8EI-7549 DESIGN DRAWN PF SCALE Vegetation Transacts and Photo -points 1 tl = I VATC Weyerhaeuser East 'Campus -- Parcel 2 I PR Federal Way, Washington REMISED CQ CarAmght-Tu(nsaea Cuwu1=ts, L.LC Year 3 Monitorin Re ort - We erhaeuser East Ca1rz us —Parcel 2 APPENDIX A PHOTOGRAPHS Adolfson Associates, Inc. December 2005 Year 3 Monitoring Report - Weyerhaeuser East Campus — Parcel 2 I I J Photo 1. Looking south over detention pond (10-21-05). Photo 2. Damage to silt fence between detention pond cells (10-21-05). Adol son Associates, Inc. December 2005 .- •• -_c P5 v . _-.!� 4 ' `_ • r ^-•�-'cat . �?b ` ;!-t��' }. ' . •�'� - - .�• � er-b �"P�-e��*�r J� .3� x- 'fir rIt i► -. � _r;,' =��. _ . '. _ • y _c :may, • a^ - �*:_gin Year 3 Monitorin Report - We erhaeuser East Cam us — Parcel 2 Photo 5. Looking north along east side of detention pond near Photopoint 2; Transect 2 is at left (10-21-05). Photo 6. Looking south from north end of Transect 3 at Photopoint 3 (10-21-05). Adolfson Associates, Inc. December 2005 } Year 3 Monitoring Report - Weyerhaeuser East Campus — Parcel 2 i � I I I I 1 7 j I APPENDIX L MONITORING DATA Adolfson Associates, Inc. December 2005 Weyerhaeuser Parcel 2 Site, Plant Survival 10-21-05 Transect 1 1 Transect 2 Transect 3 Alive Dead lAlive Dead Alive Dead Species Acer circinatum Vine maple 1 Acer macroph llum Big -leaf maple 1 Corpus nuttalld Pacific dogwood 1 1 Cornus stolonifera Red -osier dogwood 29 Cratae us sp. Hawthorne 3 Holodiscus discolor Oceanspray 1 Mahonia aquifolium Oregon grape 14 8 7 Oemleria cerasiformis Indian plum 5 Prunus emar inata Bitter cherry 1 Pseudotsuga menziesii Douglas fir 3 1 Ribes sap uineum Red currant 3 Rosa sp. Rose 7 1 Salix s . Willow 33 Sorbus s . Mountain ash 1 S m horicar os albus Snowber 19 8 Thu'a plicata Western red cedar 1 3 unknown 2 Total* 54 1 62 0 26 11 * Totals do not reflect salal plants along Transect 1, which were too numerous to count. Totals, all transects: Live plants 142 Dead plants 12 Total plants counted 154 Percent alive 92 Percent dead 8 Weyerhaeuser Parcel 2 Site, Percent Cover Data, 10-21-05 Summary of Transacts 1 through 3 Percent Cover 100, Transact Native Woody Non -Native Invasive 1 50 4 2 60 2 3 26 0 Average: 45 2 Transact 1 Woody Species Species Start Measurement (ft) End Measurement (ft) % Cover Vine maple Acer circinatum 1 2 1 Douglas fir Pseudotsuga menziesii 8 14 6 Indian plum Oemleria cerasiformis 17 18 1 Indian plum Oemleria cerasiformis 21 22 1 bi -leaf maple Acer macrophyllum 29 30 1 snowberry S mphoricarpos albus 30 39 9 big -leaf maple Acer macroph llum 43 45 2 snowberry S mphoricarpos albus 57 59 2 snowberry S mphoricarpos albus 62 64 2 Douglas fir Pseudotsuga menziesii 64 70 6 rose Rosa sp. 71 76 5 Indian plum Oemleria cerasiformis 80 81 1 Indian plum Oemleria cerasiformis 85 86 1 Oregon grape Mahonia aquifolium 91 94 3 Oregon grape Mahonia aquifolium 97 100 3 bitter cherry Prunus emarginata 100 101 1 salal Gaultheria shallon visual estimate 5 Total Woody Cover: 50 Herbaceous Species Species Percent Cover Common velvetgrass Holcus lanatus 5 bentgrass Agrostis sp. 80 hairy cat's-ear Hvpochaeris radicata 5 trailing blackberry Rubus ursinus trace fireweed Epilobium angustifolium trace bird's -foot trefoil Lotus corniculatus trace Total Herbaceous Cover: 90 Invasive Species tansy ragwort Senecio 'acobaea 1 bull thistle Cirsium vulgare 1 Himalayan blackberry Rubus discolor 1 ever reen blackberry Rubus lacinatus 1 Total Invasive Cover: 4 Weyerhaeuser Parcel 2 Site, Percent Cover Data, 10-21-05 Transect 2 Woody Species Species Start Measurement (ft) End Measurement (ft) % Cover Willow Salix sp. 1 2 1 Willow Salix sp. 4 12 8 Red alder Anus rubra 9 10 1 Red -osier dogwood Corpus stolonifera 20 24 4 Red -osier dogwood Corpus stolonifera 26 30 4 Red -osier dogwood Corpus stolonifera 32 38 6 Red -osier dogwood Corpus stolonifera 47 49 2 Willow Salix sp. 54 57 3 Willow Salix sp. 60 61 1 Red alder .Alnus rubra 62 63 1 Red -osier dogwood Cornus stolonifera 63 65 2 Red alder Alnus rubra 65 66 1 Red -osier dogwood Cornus stolonifera 66 69 3 Red -osier dogwood Corpus stolonifera 71 73 2 Red -osier dogwood Cornus stolonifera 76 77 1 Red alder Alnus rubra 78 79 1 Red alder Alnus rubra 82 93 11 Willow Salix sp. 93 101 8 Total Woody Cover: 60 Herbaceous Species Species Percent Cover bentgrass Agrostis sp. 40 lupine 2_upinus sp. 10 clover Trifolium sp. 40 soft rush Juncus effusus 5 red fescue Festuca rubra 5 yarrow Achillea sp. trace fireweed Epilobium angustifolium trace hairy cat's-ear H pochaeris radicata trace creeping buttercup Ranunculus repens trace Common velvetgrass Holcus lanatus trace Total Herbaceous Cover: 100 Invasive Species tansy ragwort Senecio jacobaea 1 curly dock Rumex crispus 1 Total Invasive Cover: 2 j Weyerhaeuser Parcel 2 Site, Percent Cover Data, 10-21-05 Transect 3 Species Start Measurement (ft) End Measurement (ft) % Cover Oregon grape Mahonia aquifolium 1 2 1 Hawthorne Cratae us sp. 5 8 3 Hawthorne Crataegus sp. 17 20 3 Western red cedar Thuja plicata 26 31 5 Western red cedar Thuja plicata 64 67 3 snowberry Symphoricarpos albus 67 69 2 Western red cedar Thuja plicata 76 81 5 Red currant Ribes sanguineum 82 84 2 Red currant Ribes sanguineum 88 90 2 Total Woody Cover: 25 Herbaceous Species Species Percent Cover Common velvetgrass Holcus lanatus 10 ben!grass A rostis sp. 80 fireweed Epilobium angustifolium 5 red fescue Festuca rubra 15 clover Trifolium sp. trace trailing blackberry Rubus ursinus trace Total Herbaceous Cover: 110 Invasive Species none Total Invasive Cover: 0 8 WETLAND BUFFER ENHANCEMENT PLAN BASELINE ASSESSMENT REPORT WEYERHAEUSER EAST CAMPUS - PARCEL 2 FEDERAL WAY, WASHINGTONF �e LIA Prepared For: QUADRANT CORPORATION Bellevue, Washington Prepared By., TALASAEA CONSULTANTS, LLC Woodinville, Washington April 11, 2003 RECEIVED BY COMMUNITY nc:VELOPMFNI r n;:pn.RrMENT AF N 16 L003 WETLAND BUFFER ENHANCEMENT PLAN BASELINE ASSESSMENT REPORT WEYERHAEUSER EAST CAMPUS - PARCEL 2 FEDERAL WAY, WASHINGTON Prepared for.• Quadrant Corporation 1110 1121h Avenue Northeast, Suite 300 Bellevue, Washington 98040 Prepared by. Talasaea Consultants, LLC 15020 Bear Creek Rd. N.E. Woodinville, Washington 98072 April 11, 2003 Weyerhaeuser East Campus - P-,,;el 2 Baseline Assessment Report TABLE OF CONTENTS 1.0 INTRODUCTION 1.1 Project Timeframe 1.2 Project History ............ 2.0 BASELINE ASSESSMENT RESULTS .................................... 2.1 Wildlife 2.2 Hydrology and Water Quality .............. _ _.. 2.3 Photo -points ........................................ ............ 2.4 Vegetation Sampling Plot Data________________ 2.4.1 Vegetation Success Criteria.. ..................0............ 2.4.2 Vegetation Summary ............................................. 3.0 MAINTENANCE ASSESSMENT AND RECOMMENDATIONS_...,._ 4.0 BASELINE ASSESSMENT SUMMARY ........ APPENDIX A — Baseline Assessment Photographs APPENDIX B - Maintenance Specifications and Guidelines 1.0 MAINTENANCE PLAN 1.1 Maintenance Schedule 1.2 Contingency Items 1.3 Control of Invasive Plants 1.4 Irrigation 1.5 General Maintenance Items List of Figures Figure 1: Vegetation Transects and Photo -points List of Tables Page 1 .2 4 4 Table 1: Calendar for Performance Monitoring Events ....................................... •............ _.— ............ 1 Table 2: Transect 1: Measurements of Woody and Herbaceous Species ..................................... Table 3: Transect 2: Measurements of Woody and Herbaceous Species ..................................... 3 Table 4: Transect 3: Measurements of Woody and Herbaceous Species ..................................... 3 List of Drawings Sheet AB 1.0: As -Built Buffer Enhancement Plan — Overview Plan Sheet AB 2.0: As -Built Buffer Enhancement Plan — Planting Plan and Plant Schedule Sheet AB 2. 1: As -Built Buffer Enhancement Plan — Planting Details and Specifications 11 April 2003 Talasaea Consultants, LLC 303BAreportAPRIL03 Page i Weyerhaeuser East Campus - Parucl 2 Baseline Assessment Report 1.0 INTRODUCTION This Baseline Assessment Report for the buffer enhancement areas at the Weyerhaeuser East Campus, Parcel 2 site (Figure 1) is submitted in accordance with the Buffer Enhancement Report (dated 10 December 2001). This report summarizes the results of a site evaluation conducted 26 March 2003. The purpose of this evaluation was to establish baseline conditions for future monitoring. During the baseline assessment, the enhancement areas were monitored and evaluated to ensure the successful development of desirable wetland buffer characteristics. 1.1 Project Timeframe The Weyerhaeuser East Campus - Parcel 2 enhancement areas were completed in the early spring of 2003. The baseline assessment was conducted following construction completion to document baseline conditions. Future monitoring will be compared to these conditions to evaluate the progress and success of the project. During the baseline assessment we also completed the as -built drawings, which are included in this report. Monitoring is required by the City of Federal Way for five years and will continue through the fall of 2007, or until success criteria are met. Performance monitoring will be conducted biannually, during the spring and fall for the first two years following construction. For years three through five, monitoring will be conducted annually at the end of the growing season. During monitoring events, the vegetation, hydrology, and wildlife will be evaluated. Maintenance reviews will also occur in the spring and fall, with a memo sent to the client after each visit outlining items requiring attention. The following table displays the performance monitoring schedule, including reports and maintenance reviews. Table 1: Calendar for Performance Monitoring Events Year 1 Year 2 Baseline Assessment MR&R PM-1 MR&R PM-2 MR&R PM-3 MR&R PM-4 MR&R 3-26-03 Spring 2003 Fall 2003 Spring 2004 Fall 2004 Year 3 Year 4 Year 5 MR PM-5 MR PM-6 MR PM-7 MR&R MR&R MR&R,FA* Spring 2005 1 Fall 2005 S ring 2006 Fall 2006 Spring 2007 Fall 2007 PM = Performance Monitoring MK = Maintenance iviemo ana Keview rt=Kepor< *Obtain final approval from necessary agencies to obtain release of the performance bond from City of Federal Way (presumes performance criteria are met) 1.2 Project History The wetland buffer enhancement areas on the Weyerhaeuser East Campus - Parcel 2 property were originally enhanced during the winter/spring of 2000. Lakehaven Utility was required to complete the enhancement work to mitigate for the construction of a sewer trunk extension line. This encompassed five buffer enhancement areas between S. 320th Street to just northeast of the intersection of Weyerhaeuser Way South and S. 336th Street. During 2001, an agreement was made between Lakehaven Utility, the City of Federal Way, and the Quadrant Corporation in which Quadrant agreed to re -grade and plant the three northern buffer areas to mitigate for disturbances that would occur as a result of developing Parcel 2. The material provided in this report includes these three areas, as well as additional areas that were disturbed during construction of the adjacent buildings. The buffer areas south of Parcel 2 will continue to be monitored and maintained by the Lakehaven Utility District. 11 April 2003 Talasaea Consultants, LLC 303BAreportAPRIL03 Page 1 i _ / 000 1^ETLAND E rLEV 7-L 5PREAVER (see Glvo Plan set) V, ETLAND A-i � .. - _ ••, . ��i DE I NTION ' POND _. is : / —.2 01 -_T: -4- �. .�. - ■ n rrn r. Y4ETLAND F GaEEK` _ I WETLAND D WETLAND G PLAN ESEND PROPERTY LINE PROPOSED CONTOUR T-# VEGETATION TRANSECT LOCATION pp-# PHOTO -POINT LOCATION NOTE: Base information provided by ESM Gonsulting Engineers, Federal Way, Washington. Source plan was modified by Talasaea Consultants for visual enhancement. TALASAEA CONSULTANTS, LLC Rewme & Environmental Planning 15020 Bw Or=k Road Northam Woodlnvillc, Wa%hEno n 0,072 Bus t425} 861.755o . t ={425l g6 t-75d 9 F IC�IJRE 1: DESIGN DRAWN Pf SCALE Vegetation Transacts and Photo -points 1 tt = I t Weyerhaeuser East Campus -- Parce 12 TE DATE l D3 Federal Way, Washington I REVISED © Copyright - TalasaeaConsultants,LLC qLffl9HTALASAEA CONSULTANTS, LLC TO: David Graves, Senior Planner OF: Madrona Planning 5604 20"' Avenue NW Seattle, Washington 98107 TRANSMITTING THE FOLLOWING: letter 4 plan sets report originals specifications proposal other be 5ti LETTER OF TRANSMITTAL FROM: Teresa Opolka PROJECT: Weyerhaeuser Parcel 2 — Ta1303M SUBJECT: Baseline Assessment Report DATE: 16 April 2003 FOR: review & comment information approval x use & files as requested action noted below x submittal L., :L P? DESCRIPTION OF MATERIALS: Four copies of the As -Built Plans, to accompany the Baseline Assessment Report (which was mailed separately on 11 April 2003). COMMENTS OR ACTIONS: If you should have any questions, comments, or need additional information, please call me at (425) 861-7550 office or 206-390-7456 cell. Thank you, cc: Jeff Roberts, Project Manager Quadrant Corporation 1110 — 112"' Ave. NE, Suite 300 Bellevue, Washington 98009 File RECEIVED BY' COMMUNITY DEVELOPMENT DEPARTMENT APR 17 2003 Teresa polka, Project nnrdinator Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98072 • Bus: (425) 861-7550 • Fax: (425) 861-7549 • Email: aolsen@talasaea.com Weyerhaeuser East Campus - Partial 2 Baseline Assessment Report 2.0 BASELINE ASSESSMENT RESULTS On 26 March 2003, we conducted the baseline assessment for the enhancement areas at the Parcel 2 site. During our site visit, the enhancement areas appeared stable, despite recent heavy rainfalls. Planted material throughout the site appeared healthy. In addition to these general observations, the baseline assessment included the following: ■ Wildlife: Observations of use by species of birds, mammals, reptiles, amphibians, and invertebrates were made throughout the site. • Hydrology: Observations were made regarding water quality, erosion, and slope stability. • Photo -points: The enhancement areas were photographed from three established locations (Figure 1) to depict present conditions (Appendix A) and act as a baseline for future evaluations. • Vegetation: Plant survival and areal coverage were monitored within each plant community at three permanent vegetation sampling locations. • Maintenance: Items or conditions that may interrupt wetland, buffer conditions, or wildlife use were identified. 2.1 Wildlife Wildlife observations recorded in the enhancement areas during the baseline assessment included the following bird species: American crow, American robin, black -capped chickadee, song sparrow and dark -eyed junco. Due to the time of year of our visit and the secretive nature of most wildlife, the probability of additional unobserved species is high. 2.2 Hydrology and Water Quality J Current hydrological conditions in the enhancement areas appeared to be stable. Clean water from the detention pond was flowing over the level spreaders and into the undisturbed wetland. The water appeared clear with no signs of films or odors. During construction we observed leakage through the detention pond berm that had caused minor erosion in the vicinity of the level spreader. Shortly after the leak was discovered the berm was repaired and no new signs of leakage or erosion have been observed. Red -osier dogwood was installed around the level spreader and is expected to further stabilize the area through the extensive root systems that will L eventually develop. J 2.3 Photo -points A series of photographs representing panoramic views of the buffer enhancement areas were J taken at three locations established during the baseline assessment (Figure 1). Photographs will continue to be taken during each scheduled monitoring event. These photographs document general appearance and plant establishment throughout the site, as well as providing a qualitative J representation of the success of the enhancement areas. The photographs in Appendix A depict the enhancement area at the time of the baseline assessment. 2.4 Vegetation Sampling Transect Data J Three permanent transects 100-feet long and ten -feet wide were established during the baseline assessment within the enhancement areas (Figure 1). Trees, shrubs, and herbaceous vegetation were evaluated within each sampling location (Tables 2-4). The established vegetation sampling transects will continue to be monitored at each performance monitoring event to aid in determining the success of plant establishment. The following tables show the percent cover of plants at each sampling location. Percent areal cover of shrubs and trees was evaluated through the use of point -intercept sampling methodology. Percent areal cover of herbaceous vegetation was visually estimated. Percent survival of shrubs and trees on the site is assumed to be close to 100%, as plants were recently installed. Percent survival will continue to be evaluated during each 11 April 2003 Talasaea Consultants, LLC 303BAreportAPRIL03 Page 2 j Weyerhaeuser East Campus - Paruel 2 Baseline Assessment Report monitoring event through counting all of the plants within the 100-foot by 10-foot sampling transects. Table 2 Transect 1:- Measurements of Woody and Herbaceous Woody Species Percent Cover Scientific Name 0.03 Gaultheria shallon 0.45 Mahonia aquifolium 0.54 Pseudotsuga menziesii 0.30 Symphoricarpos albus 0.09 Rosa gVmnocarpa Total 1.41 % Herbaceous Species Percent Cover Scientific Name 20 Agrostis tenuis Total 20% Table 3 Transect 2: Measurements of IlTotal Total Percent Cover trace 0.18 0.12 0.30% Percent Cover 15 15 2 20 52% kvolunteer or existing species Woody and Herbaceous Woody Species Scientific Name Anus rubra* Corpus sericea Salix lasiandra Herbaceous Species Scientific Name Agrostis tenuis Festuca rubra Lupinus species* Trifolium repens Table 4 1 ransect 3: Measurements of Woodv and Herbaceous b Woody Species Percent Cover Scientific Name 0.1 Corpus nuttallii 0.13 Crataegus douglasii 0.1 Gaultheria shallon .01 Mahonia aquifolium 0.07 Ribes sanguineum 0.28 Thu_ ja plicata Total 0.69% Percent Cover 25 5 Total 30 % 11 April 2003 303BAreportAPRIL03 Herbaceous Species Scientific Name Agrostis tenuis Trifolium repens ecies Common Name Salal Tall Oregongrape Douglas Fir Snowberry Baldhip Rose Common Name Colonial Bentaras s Common Name Red Alder Red -osier Dogwood Pacific Willow Common Name Colonial Bentgrass Red Fescue Lupine species White Clover cles Common Name Pacific Dogwood Black Hawthorn Salal Tall Oregongrape Red Currant Western Red Cedar Common Name Colonial Bentgrass White Clover Talasaea Consultants, LLC Page 3 Weyerhaeuser East Campus - Par 12 Baseline Assessment Report 2.4.1 Vegetation Success Criteria The established vegetation sampling transects will continue to be monitored at each performance monitoring event to aid in determining the success of plant establishment. Following are the success criteria to be met by the end of the five-year monitoring period: • 85% survival rate of all planted woody species (trees and shrubs), or at least 60% areal coverage of the combined installed and volunteer woody plants by the end of the five-year monitoring period. <20% total cover of all exotic and invasive plant species within the enhancement areas. 2.4.2 Vegetation Summary The woody plant material that was recently installed appears healthy. Due to the lack of foliage at the time of the baseline assessment, percent areal coverage was minimal. As plants begin to leaf out, percent areal coverage will increase significantly. As the plants continue to grow and mature, their root systems will provide long-term stabilization and erosion control for the site, as well as habitat for a variety of birds and small mammals. The areal coverage of desirable herbaceous vegetation on the site averaged 34%. The herbaceous vegetation layer is dominated by red fescue, colonial bentgrass, and white clover. At the time of our visit, grass in the enhancement areas had just begun to grow. It is expected that with irrigation this summer the site will be fully vegetated by this fall. Invasive plants were not observed in the enhancement areas. 3.0 MAINTENANCE ASSESSMENT AND RECOMMENDATIONS On -going maintenance should be performed according to our Maintenance Specifications and Guidelines (Appendix B). It is expected that regular maintenance action will be required to ensure plant survival. Regular irrigation during the first two growing seasons will be necessary in order for the newly planted shrubs and trees to establish and satisfy the requirements for success and subsequent release of the performance bonds. At the time of the baseline assessment, the following maintenance items required addressing: • Several of the conifers planted in the undisturbed buffer (located east of Transect #3) are leaning and require staking. 4.0 BASELINE ASSESSMENT SUMMARY The baseline performance monitoring event for the enhancement areas at the Weyerhaeuser East Campus - Parcel 2 site was conducted to establish a baseline for future monitoring to record the growth of the vegetation, ensure that proper hydrological conditions exist in the wetland areas, and to evaluate wildlife usage of the site. During this event we also identified maintenance issues that required attention. A diverse collection of woody and herbaceous vegetation is present in the mitigation areas. Percent survival of planted species is 100%. Woody vegetation appears healthy and is expected to steadily increase in cover during the 2003-growing season. Invasive plants were not observed during the baseline assessment visit. The site appeared stable, with no signs of erosion. The hydrology within the detention pond and level spreader appeared to be functioning as designed. In conclusion, it is our opinion that the enhancement areas at the Weyerhaeuser East Campus Parcel 2 site are in healthy condition. As depicted in the attached photographs and reflected in the vegetation sampling locations, all of plant material is healthy, and is expected to thrive in the enhanced wetland buffer areas. As the vegetation on -site continues to mature and increase in biological and structural diversity, it is expected that the mitigation areas will provide increased ecological value to the adjacent wetland system. 11 April 2003 303BAreportAPRIL03 Talasaea Consultants, LLC Page 4 Weyerhaeuser East Campus - Parcel 2 Baseline Assessment Report Baseline Assessment Photographs `A 11 April 2003 Talasaea Consultants, LLC 303BAreportAPRIL03 Appendix A .► 'q� .' _ �� fir' ''� � .. •• + lip y r r r II �Y • . i w 7 } 'v.�•'![ r � PPS - � f; . wv i '+r• r .[ p� `�r . 4 -�• yf �,,tc ' ��rr - — '' r * ! � •' �■•;: � , r I k1 � a •y ,' ,� i r pc • " ;'�.1� �y' 3 i'+t ; `ac "fit p . .•r tr _ e _ • r� 1 - tea' .. kr&,+:-�`.a.�• �.; .�y<i. - ." E i[�}?. ,�.! �! ff � t�s +�• • f ;1 l •C•J - .1�{� ryJL �` •-1: �7.•:+� �� r L_ ` �: 1_a'! 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't r.r►�• r( •an.�'-'•s,;�p� . fir_ - _ Ile af' y •. , , Weyerhaeuser East Campus - Parcel 2 Baseline Assessment Report ^1 _I APPENDIX B Maintenance Specifications and Guidelines 11 April 2003 303BAreportAPRIL03 Talasaea Consultants, LLC Appendix B Weyerhaeuser East Campus - Parcel 2 Baseline Assessment Report 1.0 MAINTENANCE PLAN Maintenance will be conducted on a routine, year round basis. Additional maintenance needs will be identified and addressed following each biannual monitoring event. The project will be evaluated by comparing the monitoring results to the established performance standards. This will ensure that success criteria are achieved at or before the end of the monitoring period. Maintenance and remedial action on the site will be implemented in accordance with the City of Federal Way maintenance standards and the following plan. Contingency measures, as defined below in Section 1.4 will be implemented if performance standards are not being met. The maintenance plan contains the following: maintenance schedule, contingency items, control of invasive plants, irrigation, and general maintenance items. 1.1 Maintenance Schedule Invasive plant control, irrigation, and general maintenance should occur on a regular, routine basis according to Table 1.0. These tasks are in addition to the biannual maintenance reviews conducted by Talasaea Consultants. Table 1.0 Maintenance Schedule Guidelines Maintenance Item Jan Feb I Mar Apr I May June I July AugSep Oct I Nov Dec Invasive Plant Control 1 1 1 1 1 1 1 1 Irrigation 2003 4 8 8 8 4 Irrigation 2004 2 4 4 4 2 General Maintenance 1 1 1 1 1 1 1 1 1 1 1 1 1-8=number of times task should be performed per month 1.2 Contingency Items Replace Dead Plants — The Maintenance Contractor should replace dead plants with the same species or a substitute species approved by Talasaea Consultants that meet the goals and objectives of the mitigation plan. Replanting - The Maintenance Contractor should replant areas after reason for failure has been identified (e.g., moisture regime, poor plant stock, disease, shade/sun conditions, wildlife damage, etc.). Areas will be replanted with an approved species or a substitute species that meet the goals and objectives of the mitigation plan. Replacement plantings should follow the details and specifications on the approved mitigation plan. 1.3 Control of Invasive Plants Routine removal and control of non-native and other invasive plants needs to be performed by manual or chemical means approved by the City of Federal Way. Undesirable and weedy exotic plant species need to be maintained at levels below 20% total cover in any given stratum. To avoid corrective measures, bondholders will be encouraged to maintain mitigation sites within these standards throughout the monitoring period. Following are specific recommendations for the removal of reed canarygrass and blackberries. All other invasives such as Scot's broom, purple loosestrife, and nightshade should be grubbed out. Reed Canarygrass Control - Patches 3' x 3' or smaller need to be grubbed out. Patches greater than 3'x 3' should be either staked with cuttings or sprayed (see Staking Specifications and Staking List below). A walk through will be conducted with the Maintenance Contractor and Talasaea Consultants to determine the site -specific treatments to be used. Staking of new patches should be integrated into the standard maintenance procedures for designated staking areas. Selective spraying with Rodeo will be used only in 11 April 2003 303BAreportAPRIL03 Talasaea Consultants, LLC Page 1 Weyerhaeuser East Campus - Parcel 2 Baseline Assessment Report designated spray areas. Spraying should be done at a time when a dry week of weather is predicted (with City approval only). Staking Specifications: Cuttings can be purchased through a nursery, or gathered from on -site mature sources in areas approved by Talasaea Consultants. Cuttings shall be installed at 1' on center spacing over the infested reed canarygrass areas unless otherwise specified. Cuttings shall be 2-year old wood, 4' length, %" diameter, with all side branches removed and installed to a minimum depth of 12- inches. Black cottonwood stakes should be installed to a minimum depth of 24-inches. Staking List: Options for Planting from Wet to Dry Wet Conditions: Salix lasiandra Pacific Willow Salix sitchensis Sitka Willow Salix scouleriana Scouler Willow Dry Conditions: Populus trichocarpa Black Cottonwood Himalayan Blackberry Control - Small patches need to be grubbed out. Large areas need to be cut down. As new shoots (approx. 6" in height) reappear, they can be spot -sprayed with Rodeo. 1.4 Irrigation Watering - The Maintenance Contractor should water either by hand, a water truck, or with a temporary aboveground irrigation system from June 15 through October 15. During the first year after installation, irrigation should be at a rate of 1/2" of water twice a week. During the second year after installation, irrigation should be at a rate of 1/2" of water once a week. However, if more than 10% of plant replacement occurs, watering rates should be maintained at a rate of 1/2" of water twice a week for the duration of the monitoring period. Monitoring and Maintenance of the Temporary Aboveground Irrigation System - Inspection of the irrigation system should be conducted in the spring and mid -season to ensure adequate coverage and function of the entire system. All repairs, resetting of heads, and adjustments should be performed when problems arise. By October 15`h, the system should be winterized to prevent winter freeze damage. 1.5 General Maintenance Items Debris Removal - The Maintenance Contractor should remove all trash and other debris on a regular basis. Erosion and Drainage Problems —The maintenance contractor should correct any erosion or drainage problems (e.g., bank or berm slumps, pond leaks, overflow spillways clogs, etc.). Foraging and Browsing - The Maintenance Contractor should implement control and prevention measures to prevent damage of planted material by browsing of wildlife (e.g., deer, rodents, and rabbits). Maintenance of Trees and Shrubs - Routine maintenance of trees and shrubs should be performed. These measures include: maintaining mulch rings, tightening and repair of tree stakes and resetting plants to proper grades and upright positions. With the approval of 11 April 2003 Talasaea Consultants, LLC 303BAreportAPRIL03 Page 2 Weyerhaeuser East Campus - k4dreel 2 r Baseline Assessment Report Talasaea Consultants, the Maintenance Contractor should remove all tree stakes after the first growing season to prevent girdling of staked plant material. Pruning of Woody Plants - Woody plants should only be pruned at the direction of Talasaea Consultants. Signage - The Maintenance Contractor should clean and check signage for damage twice yearly. Silt Fence Removal - With the approval of Talasaea Consultants, silt fences should be removed one-year after the City has approved the mitigation construction, and the area should be restored by hand seeding (see plant schedule for seed mixes), if needed. Structure Maintenance - All structures (e.g., weirs, culverts, trash racks, etc.) should be cleaned and repaired as needed to maintain proper function. Vegetation Control — Mitigation areas are not intended to be maintained like traditional landscaping. Grasses and other herbaceous vegetation should be controlled only at the direction of Talasaea Consultants. Grasses and herbs should be allowed to grow tall, providing habitat for small mammals. Mechanized devices such as mowers and weed whackers should not be used unless specifically allowed by Talasaea Consultants. 11 April 2003 303BAreportAPRIL03 Talasaea Consultants, LLC Page 3 M VI M V E S t' < 4 a 5 t � ,��p . .......... MV I I 4 4 4' 4. ;e.% gr -4 r KI 7l M T, I' A X.; I. —II. I XX z ... I. % .. .. go -TI 4 . ......... MINE .0,r w., L_J y M M.M X,X.X": > J" cl M ......................I, o M 0 < > ..... ..... r Q :3 .. I ...... M.................... Mn gv > Fi ...... I ............... "X.Xv 3 MA :3 0-00-- -0�, 2 6 — :IX 4 ....... I. ON. ....... .............. I ........... ....X. X..X. XV if .f I ....... .......... z —i 4 J. z -77 '3 Q ........ ..... ...... At. ai ..... Ix. 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