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Home My WebLink AboutLUA-02-051 extra documents1 NORTHWEST BIOLOGICAL CONSULTANTS Providing comprehensive biological and environmental assessments throughout Washington Plant & animal studies T & E Surveys Baseline studies Wetland Delineations Habitat analysis EA/EIS 16410 84TH Street, NE, #D-413, Lake Stevens, WA 98258, (360) 691-3561, fax (360) 691-2511 it � I January 18, 2008 Ms. Andrea Petzel, Planner Development Services Division City of Renton 1055 South Grady Way Renton, WA 98057 DEVELOPMENT PLANNING, CITY OF RENTON FEB - 5 2008 RECEIVED Re: Third Annual Maintenance and Monitoring report for Sienna Final Plat. City of RentonFile INo :LUAh02 0773 Dear Ms. Petzel: This letter presents the results of the third and final annual monitoring visit for the long- term monitoring required for the wetland mitigation area on the Sienna Development in Renton, Washington (Figures 1 and 2). The survey was conducted on December 28, 2007 in order to continue monitoring the mitigation which was implemented within the wetland and buffer area. The buffer area and wetland were evaluated to assess the condition of the plants that were planted in 2002. This letter has been prepared as part of the requirements established by the City of Renton for the project. Methodology The vegetation cover was estimated at each of the four plots which were established during the first year monitoring survey. Photographs were taken at each plot to The purpose of the December 2007 survey was to: (1) document the physical and ' biological changes that have occurred since the first year survey; and (2) determine if the goals and objectives are continuing to be met as proposed in the Mitigation Plan. Goals and Objectives As outlined in the Mitigation Plan, the fundamental goal of the mitigation was to replace the wetland functions and values that were lost during the filling of two small wetlands. Compensation for the loss of these functions and values was accomplished by creating approximately 3,522 square feet of compensatory wetland along the eastern boundary of ' an existing wetland and enhancing the buffer. Enlargement and enhancement of the wetland and buffer has resulted in a no net loss of in-kind habitat values, and has resulted in a mitigation wetland and buffer with functions and values equal to or greater than those for the impacted wetland. Methodology The vegetation cover was estimated at each of the four plots which were established during the first year monitoring survey. Photographs were taken at each plot to Ms. Andrea Petzel, Planner City of Renton Page 2 ' document the existing conditions during the December 28, 2007 survey. (See Figures 3 and 4). The overall growth and establishment of the planted vegetation within the wetland and buffer was also evaluated, and is summarized below. Results of the Survey During the monitoring visit conducted on December 28, 2007, the overall condition of the buffer appeared to be very good to excellent (Figure 4). All of the trees and shrubs planted during previous years appeared to be alive and doing well. The conifers that showed signs of some distress during the January 2007 survey appear to be alive and healthy. There has been additional vegetative growth since the previous visit and all of the monitoring plots support numerous plant species. Numerous alders are growing throughout the wetland and buffer with noticeable growth since the previous survey. A large cedar tree (-10 inch dbh) has fallen within the buffer area within the last 12 months, probably during one of the wind storms in November 2007. This tree will eventually provide additional habitat for wildlife species as it decays. Specific information is provided below for each plot. Monitoring Plot #1: All of the plants in the area encompassing Plot #1 appeared to be doing well and additional re -vegetation appears to have occurred over the previous 12 - months. Ground coverage is about 95 percent and the area continues to support a relatively mature plant community. Monitoring Plot #2: Plot #2 is also well vegetated area and the herbaceous and shrub ' layers provide about 95 to 100 percent ground coverage. All of the shrub and tree species are healthy. Monitoring Plot #3: Ground coverage is approximately 95 percent and re -vegetation has occurred throughout the area. The shrub and tree species are healthy and natural re - vegetation has occurred since the previous survey. Monitoring Plot #4: The herbaceous layer is well developed and provides about 90 to 95 percent ground coverage. All of the herbaceous, shrubs, and tree species are alive and healthy. Summary and Recommendations The overall goals and objectives of the mitigation plan have been met, and the functions and values of the wetland and its buffer appear to have increased since the previous monitoring visit. Herbaceous ground coverage ranges from approximately 95 to 100 percent at each of the four plots, and the overall appearance of the wetland and buffer is very good to excellent due to growth of the species planted as well as from natural Ms. Andrea Petzel, Planner City of Renton Page 3 re -vegetation. Standing water (2" to 4") was present in portions of the wetland area indicating that hydrological conditions are present. This report constitutes the third and final monitoring report required for the Sienna Final Plat. If you have any questions, please call me at (360) 691-4951. Sincerely, Randall C. Arnold, Jr. Principal & Senior Biologist cc: Mr. Joel Young Connor Homes Ms. Andrea Petzel, Planner City of Renton Page 4 References Anderson & Ray, Inc. 1997. Planting Plan for Riverside Landing Senior Project, Bothell, Washington. ' Environmental Laboratory. 1987. Corps of Engineers Wetland Delineation Manual Technical Report Y-87-1. U.S. Army Engineers Waterways Experience Station. Vicksburg, MS. Hitchcock, C., and A. Cronquist. 1976. Flora of the Pacific Northwest. University of Washington Press. Seattle Kentula, M. 1986. Working Group report. Creation and Rehabilitation. Pages 129-132 in Proceedings on the conference on wetland function, rehabilitation, and ' creation in the Pacific Northwest: The state of our understanding. Washington Department of Ecology Publicaton No. 86-14. Olympia, WA. 184 pp. Mueller-Dombois, D. and H. Ellenberg. 1974. Aims and methods of vegetation ecology. John Wiley and Sons, New York, NY. Northwest Biological Consultants, Inc. 2002. Mitigation Plan Sienna Development. Prepared for Connor Homes, Bellevue, Washington. Washington Department of Ecology. 1993. Restoring wetlands in Washington, a guidebook for wetland restoration, planning and implementation. Publication #93-17. i FIGURE 1 VICINITY MAF N.T.S. (Source: Thomas Bros. Maps, 2004) � I �« I i MEDINAI ==u SAMMAMISH `V BEAUx �ELLE�(UE v 6 1�,�'> I�/ r� ,1�.. `!�( ,ARTS ��"a t( � �:, • h I , 4' BREMERTON _ U'e VILLAGE i�r x ! r A .. 0,. s,nu✓:eT�s 15EA, E ., MERCER II COUII+r;� ISSAQUAH 'f L PORT9�M7 ISLAND NEWCASTLESNOQUALMIE ,.TrO IJ ORCHARDf q, ,..- " �1, �J �N •r• 11 i /(f•FF' P �J 1• dl I r yrs IWNTA/N NORTH. -Ad q(r1-BURIEN TU VJILA 1 RENT srdr*s BEND n SEATAC NORMANDY- g, NrilsrrsrOI(n( PARK VIN t:Y <r COGTO DES n Izao1N_, I, sr i–'MAPLE : < \ � rouNr Haom ` MOINES i< KENT. „,Vi Y',`\, - . MUUN( 21Kf R-SNWWIUIIF IISlAND ,1 i V ii, •a � , ,cG�iA` RAKE:. ?I I 3 . , n' BLACK DIAMOND oNLs, j / S ( GIG ?I ^ AUBURN ; 3 yam. 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