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Home My WebLink AboutSWP272255(5) � r `y T-1412-01 DEVELOPMENT PLANNING r CITY OF RFNTON sh Y FIEB 2 01996 RECEIVED �q Preliminary Wetland Delineation }s Van Woerden Tract r' t Southwest of Raymond Ave. S.W. Renton, Washington October 1992 f:. Mr. Tim Puryear Winmar Company, Inc. 700 - 5th Avenue Gateway Tower Seattle, WA 98104-5026 �T t,1 ,Z Y VIM Ing Rom G� ty SHANNON 6WILSON, INC. GEOTECHNICAL AND ENVIRONMENTAL CONSULTANTS 400 N. 34th St. - Suite 100 P.O. Box 300303 Seattle, Washington 98103 206 -632 .8020 -�/- I SHANNO WILS ESEATTLE VE ETT GEOTECHNICAL AND ENVIRONMENTAL CONSULTANTS KENNEWICK FAIRBANKS ANCHORAGE • SAINT LOUIS October 27, 1992 Mr. Tim Puryear Winmar Company, Inc. 700 - 5th Avenue Gateway Tower Seattle, Washington 98104-5026 RE: PRELIMINARY WETLAND DELINEATION VAN WOERDEN TRACT SOUTHWEST OF RAYMOND AVENUE SOUTHWEST RENTON, WASHINGTON A preliminary wetland delineation was requested by Mr. Tim Puryear from Winmar Company, Inc, for the Van Woerden Tract property located southwest of Raymond Avenue Southwest in Renton, Washington. Shannon & Wilson, Inc. prepared this preliminary wetland delineation in accordance with our proposal dated September 1, 1992. The scope of services was authorized by Mr. Dean Henery on October 8, 1992. The objective of this preliminary wetland delineation is to identify �v and flag wetland boundaries on the subject property using the Federal Manual for Identifying and r. . DelineatingJurisdictional Wetlands (January, 1989). Sincerely, > SHANNON & WILSON, INC. Theresa R. Henson Wetland Specialist ra W. Pita, P.G. Vice President TRH:FWP/trh T 1412-01.RPT/r 1412-1kd/dgw 400 NORTH 34TH STREET-SUITE 100 T-1412-01 P.O.BOX 300303 SEATTLE,WASHINGTON 98103 206.632.8020 FAX206.633.6777 SHARON&WILSON,INC. EXECUTIVE SUMMARY The findings and conclusions presented in this study are based on an interpretation of information currently available to Shannon & Wilson, Inc. This summary is for introductory purposes and should only be used with the full text of this report. Based upon information derived through site reconnaissance and readily available documents, three wetland areas were delineated on the subject property. The wetland delineation was based upon the Routine On-Site Determination Method described in the Federal Manual for Identi , inQ and Delineatiniz Jurisdictional Wetlands (January, 1989). Wetland "A" is a palustrine forested (willow),palustrine shrub-scrub(willow),palustrine emergent(yellow iris/cattail)wetland located along the eastern property boundary. The on-site portion of Wetland "A" is approximately 1.35 acre (58,742 square feet (fe))in size. Wetland "B" is a palustrine scrub-shrub (alder), palustrine emergent (reed canarygrass/cattail) wetland located in the southwest quarter of the site. The on-site portion of Wetland "B" is approximately 4.21 acre (183,184 ftz) in size. Wetland "C" ! is a palustrine scrub-shrub (willow), palustrine emergent (sedge) wetland located along the i' northeastern property boundary. The on-site portion of Wetland "C" is approximately 0.03 acre (1,329 ftZ) in size. Using the City of Renton Wetland Management Ordinance No. 4346 (March 1992) Wetlands "A", "B", and "C" would be classified as Category 3, Lower Quality Wetlands. These wetlands have been severely disturbed by human-related hydrologic alterations including diking, ditching, channelization and outlet modification, and have had soils alterations including the presence of fill, soil removal and soil compaction. The ordinance requires 25 foot native vegetation buffers around the wetlands, since the site would have an urban Shoreline Master Program designation. A 20 foot building setback from the wetland buffer edge may also be required by the City of Renton Building Regulations. Springbrook Creek flows in a northerly direction through the center of the site. Springbrook Creek would require at least a 50 foot native vegetation buffer between the creek and any development, since the site would have an urban Shoreline Master Program designation. A Modified Reppert Values Evaluation (MRVE) was completed for each of the three wetland areas. Based on an interpretation of the MRVE, Wetlands "A" and "B" have generally high to moderate functions and values, and Wetland "C" has generally moderate functions and values. T-1412-01 i SHAWN&WILSON.INC. TABLE OF CONTENTS Page EXECUTIVE SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .i 1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 Scope of Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Site Location and Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.0 DOCUMENT RESEARCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1 Historical Aerial Photographs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Wetland Inventory Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2.1 City of Renton Wetland, Lakes, Rivers and Streams Maps . . . . . . . . 5 2.2.2 U.S. Fish and wildlife Service National Wetland Inventory Map . . . . 5 2.3 Washington State Natural Heritage System Database Review . . . . . . . . . . . . 5 2.3.1 Washington State Department of Wildlife Nongame Database Review 5 2.3.2 Washington State Department of Natural Resources Database Review 5 2.4 Soil Conservation Service Soil Survey of the King County Area . . . . . . . . . 6 2.5 Springbrook Creek Stream Flow Data . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.0 SITE RECONNAISSANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.1 Site Conditions During Site Visit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2 Topography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.3 Fauna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.4 Vegetation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.5 Soils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.6 Hydrology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.0 WETLAND AREAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.1 Wetland "A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4.2 Wetland "B.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4.3 Wetland "C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 T-1412-01 ii S ON&WILSON.INC. TABLE OF CONTENTS (cont.) 5.0 WETLAND FUNCTIONS AND VALUES . . . . . . . . . . . . . . . . . . . . . . . . . 11 5.1 Wetland "A" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 . 5.2 Wetland "B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5.3 Wetland "C.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.0 WETLAND REGULATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.0 CONCLUSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8.0 CLOSURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 9.0 LIST OF REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 LIST OF TABLES Table No. 1 Identified Wetland Vegetation Species 2 Identified Upland Vegetation Species 3 Hydric Soil Indicators 4 Results of Triple Parameter Approach for each Plot/Test Hole 5 Hydrologic Regimes and Wetland Characteristics LIST OF FIGURES Figure No. 1 Vicinity Map 2 Wetland Site Plan 3 City of Renton Wetlands Map 4 National Wetland Inventory Map 5 Soil Conservation Service Map T-1412-01 iii SHAAN&WILSON,INC. TABLE OF CONTENTS (cunt.) LIST OF APPENDICES APPENDIX A - WETLAND DELINEATION METHODOLOGY APPENDIX B - PHOTOGRAPHS APPENDIX C - DEPARTMENT OF WILDLIFE NONGAME DATABASE INFORMATION APPENDIX D - DEPARTMENT OF NATURAL RESOURCES DATABASE INFORMATION APPENDIX E - DEFINITION OF PLANT INDICATOR STATUS AND FIELD SHEETS APPENDIX F - MODIFIED REPPERT WETLAND VALUES EVALUATION SHEETS T-1412-01 iv SHAMON&WILSON,INC. PRELIMINARY WETLAND DELINEATION VAN WOERDEN TRACT RENTON, WASHINGTON 1.0 INTRODUCTION Shannon & Wilson, Inc. has completed a preliminary wetland delineation of the Van Woerden Tract property located southwest of Raymond Avenue in Renton, Washington (Figure 1). The scope of services was authorized by Dean Henery on October 8, 1992. This work was per- formed for Winmar Company, Inc. to assist in the acquisition of permits necessary to proceed with development of the subject site. 1.1 Scone of Services The scope of work for this study was limited to the following tasks: ► Review of local regulations pertaining to the wetland areas identified on or near the subject site. The review will be used to identify the required buffers and to classify the on-site wetlands. ► Conduct a visual assessment to observe existing site conditions and identify and flag . any wetlands located on the site. This will be accomplished using the Routine On-Site Determination Method, defined in the January 1989 Federal Manual for Identif�jng and Delineating Jurisdictional Wetlands (Appendix A). P. A review of aerial photographs to help identify past disturbances and conditions of the site. ► Review of readily available documents including: - Local wetland inventory maps. - U.S. Fish and Wildlife Service National Wetland Inventory Maps. - The Soil Conservation Service soil survey of King County. ► A review of the Washington Department of Natural Resources database for endangered, threatened, or sensitive plants or plant communities and animals and their breeding or nesting areas on and near the site. T-1412-01 1 0 SHASON&WILSON.INC. ► Assessment of identified wetlands to help determine the overall functions and values of the wetlands. ► Preparation of a report documenting the process, findings, conclusions, and any recom- mendations for this project. 1.2 Site Location and Description The subject property is located southwest of Raymond Avenue Southwest along Springbrook Creek in Renton, Washington (SE1/4 Sec. 24 T23N R4E) (Figure 1). The subject site is a rectangular shaped parcel of land consisting of approximately 28 acres. Springbrook Creek flows in a northerly direction through the center of the site. The site consists of six distinct areas, the northwest upland field, the southwest wetland, the eastern upland field, the northeast wetland ditch, the eastern wetland, and Springbrook Creek (Figure 2). Photographs of the subject property are included in Appendix B. Three wetlands were identified on the subject site. Wetland "A" .is a palustrine forested f- (willow),palustrine shrub-scrub (willow),palustrine emergent(yellow iris)wetland located along the eastern property boundary. The on-site portion of Wetland "A" is approximately 1.35 acre t t�. (58,742 square feet (ft'� in size. Wetland "B" is a palustrine scrub-shrub (alder), palustrine emergent (reed canarygrass/cattail) wetland located in the southwest quarter of the site. The on-site portion of Wetland "B" is approximately 4.21 acre (183,184 ftZ) in size. Wetland "C" is a palustrine scrub-shrub (willow), palustrine emergent (sedge) wetland located along the northeastern property boundary. The on-site portion of Wetland "C" is approximately 0.03 acre (1,329 fe) in size. The site is bounded on the north by undeveloped land and wetlands, on the south by a ware- house, undeveloped land and wetlands, on the east by wetlands and a cleared lot, and on the west by the Longacres Practice Track. T-1412-01 2 SHAON&WILSON.INC. 2.0 DOCUMENT RESEARCH 2.1 Historical Aerial Photographs In the study of aerial photographs, observations are interpretive and limited to the subject site and adjacent areas. Aerial photographs for the years 1936, 1946, 1956, 1960, 1968, 1974, 1980, 1985, and 1990 were reviewed to evaluate past site conditions. 1936 Aerial Photograph Interpretation of the photograph taken in 1936 indicated that the subject property contained grassy fields, and a bridge was located over the northern on-site portion of Springbrook Creek. Springbrook Creek flowed in a northerly direction through the center of the site. A portion of an old meander scar from the Green River extended from the east central property boundary to Springbrook Creek. A small creek flowed north from the south central property boundary into Springbrook Creek. An east-west ditch had been excavated from the northeast corner of the site to Springbrook Creek. 1946 Aerial Photograph C Interpretation of the photograph taken in 1946 indicated that the on-site fields had been recently plowed, and planted, and shrub vegetation was located on-site along the eastern property boundary. The meander scar was well defined and inundated. The small creek was shrub covered. Standing water was located in the central portion of the eastern field. Culverts and fill material were placed at the eastern and western ends of the ditch located on the northeastern property boundary. 1956 Aerial Photograph Interpretation of the photograph taken in 1956 indicated that shrub vegetation that was located along the eastern property boundary had been cleared. Otherwise the site appeared relatively unchanged from the 1946 photo. 1960 Aerial Photograph Interpretation of the photograph taken in June of 1960 indicated that at the majority of vegetation that was located along the small creek had been cleared, and it was evident that the small stream T-1412-01 3 0 SHAMON&WILSON,INC. did not have a well defined channel. The old meander scar had been recently dredge and the dredge materials had been side cast to form a low dike. The eastern field contained several east- west shallow ditches. Standing water was present over much of the southwestern field. 1968 Aerial Photograph Interpretation of the photograph taken in May of 1968 indicated that Springbrook Creek, the meander scar, and the small creek had been recently deepened and widened. The dredge materials had been side cast. The bridge crossing the northern on-site portion of Springbrook Creek had been removed. A portion of the southwest field, and the adjacent property east of the site had been cleared of vegetation. 1974 Aerial Photograph Interpretation of the photograph taken in March of 1974 indicated that the southwest field had been cleared, and a series of shallow east-west ditches had been constructed. A deep ditch northwest-southeast ditch had been constructed in the southwest corner of the site. A deep ditch had also been excavated along the southern property boundary. The northern portion of the small creek, adjacent to Springbrook creek had been filled and a culvert was placed in the fill. A tall berm had been constructed on the southern edge of the meander scar. A small "v" shaped t' break was observed in the western portion of the berm. Standing water was present in all of the ditches, in the southwest field, in Springbrook Creek, the meander scar, the small creek, and in the eastern portion of the eastern field. 1980 Aerial Photograph Interpretation of the photograph taken in May of 1980 indicated that the eastern field had been filled. Standing water was evident in all of the on-site ditches, Springbrook Creek, the meander scar, and the southwestern field. 1985 Aerial Photograph Interpretation of the photograph taken in March of 1985 indicated that the western half of the site had been cleared of vegetation. Standing water was evident in the same locations described in the 1980 aerial photograph. T-1412-01 4 • SHAOON&WILSON.INC. 1990 Aerial Photograph Interpretation of the photograph taken in July of 1990 indicated that the eastern field had been cleared and graded. 2.2 Wetland Inventory Maps 2.2.1 City of Renton Wetland, Lakes. Rivers and Streams Mans The City of Renton's Wetland, Lakes, Rivers and Streams Maps shows a portion of Wetland 9 (W-9) located on the eastern boundary of the subject property (Figure 3). Wetland 9 is listed in the City's Wetland Inventory Report as containing palustrine emergent, palustrine scrub-shrub, palustrine forested, and palustrine open water (permanently flooded) wetland classes. At the time of the site visit the wetland was entirely vegetated and an open water component was not observed in the wetland. 2.2.2 U.S. Fish and Wildlife Service National Wetland Inventory Map . The U.S. Fish and Wildlife Service National Wetland Inventory Map (1973) for the area j. shows a palustrine emergent saturated/semipermanent/seasonally flooded wetland (PEMY) as being present in the steam beds and on the eastern boundary of the subject property (Figure 4). �. 2.3 Washington State Natural Heritage Svstem Database Review 2.3.1 Washington State Department of Wildlife Nongame Database Review A review of the Washington State Department of Wildlife Nongame Database has been requested to determine if there has been a recorded occurrence of special animal species on-site or within the immediate vicinity of the subject property. The data base review information has not been received at this time but will be forwarded upon receipt in our office. 2.3.2 Washington State Department of Natural Resources Database Review A review of the Washington State Department of Natural Resources Database determined that there are no significant natural features located on or within the immediate vicinity of the subject property (Appendix D). Significant natural features that would be listed include endangered, threatened, or sensitive plant species as well as high quality native plant communi- ties and wetlands. T-1412-01 5 SHANION&WILSON.INC. 2.4 Soil Conservation Service Soil Survey of the King County Area The U.S. Soil Conservation Service (SCS) Soil Survey of King County, Washington (1973) was consulted to determine the general nature of soils on the subject site. The following soils information was taken from this publication. Puyallup sandy loam (Py on the SCS map) and Woodinville silt loam (Wo on the SCS map) is mapped as being present on the subject property (Plate 5). The Puyallup series is made up of well drained soils that formed in alluvium under grass, hardwoods and conifers. These soils are typically located on natural levees adjacent to streams. The surface layer is typically a grayish-brown and dark grayish-brown fine sandy loam extends to a depth of about 34 inches. The substratum to a depth of about 60 inches, is a very dark grayish-brown, and dark-brown medium sand, loamy sand, and sand. Permeability of this soil is moderately rapid. Available water capacity is moderately high, surface runoff is slow, and the erosion hazard is slight. the seasonal water table is typically at a depth of 4 to 5 feet. As part of the mapping of the Puyallup series, the SCS has included up to 15 percent Briscot, F. I Newberg, Nooksack, Oridia, and Renton soils; and up to 10% poorly drained Woodinville and Puget soils. The Puyallup series is not included on the hydric soil list for King County; nor are the Newberg and Nooksack soils included within the Puyallup map unit, however, the Briscot, t' Oridia, Renton, Woodinville and Puget soils included in the Puyallup map unit are list as hydric soils. The Woodinville series is made up of poorly drained soils that formed under grass and sedges, in alluvium, on steam bottoms. A representative profile of Woodinville soils includes gray silt loam, silty clay loam, and layers of peaty muck to a depth of about 38 inches. This is underlain by greenish-gray silt loam extending up to 60 inches or more in depth. Permeability of the Woodinville soil is moderately slow and the water table is usually at or near the surface. Available water capacity is high and surface runoff is slow. As part of the mapping of the Woodinville soil, the SCS has included up to 15 percent Puget soils, up to 10 percent Snohomish, Oridia, Briscot, Puyallup, Newberg and Nooksack soils. The Woodinville series is included on the hydric soil list for King County; as are the Snohomish, Oridia, and Briscot soils included in the Woodinville map unit. The Puyallup, Newburg and Nooksack soil included in the Woodinville map unit are not included on the hydric soils list. T-1412-01 6 SHAN ON&WILSON,INC. 2.5 Springbrook Creek Stream Flow Data Data gathered and provided by Mr. James Nuerenberg of Boeing indicates that Springbrook Creek at the Bridge, directly north of the subject property, had base flows from September 1991 to February 1992 ranging between 5 and 18 cubic feet per second. This data indicates that Springbrook Creek does not have a flow greater than 20 cubic feet per second, and therefore, would not expect to be regulated under the Shoreline Management Act. 3.0 SITE RECONNAISSANCE 3.1 Site Conditions During Site Visit On September 9, 1992, Ms. Theresa Henson, Wetland Specialist, and Ms. Ann Youberg, Environmental Specialist, with Shannon &Wilson, visited the subject site to locate and flag the wetland boundaries. The site visit included a visual observation of the subject site and surround- ing area. t^. The eastern upland field on the subject property is relatively flat and contains a large area of fill. North and east of the eastern upland field are on-site areas that were not filled, and are considered to be wetlands, Wetland "C" and "A" respectively. South and west of the eastern r upland field is Springbrook Creek. The northwestern portion of the site contains an upland field and a few shrubs. A weather station is located in the southern portion of this field. The majority of the southwestern portion of the site contains a wetland field. North of the wetland field is a wetland containing shrubs, a narrow upland berm, and a permanently flooded wetland with cattails. The narrow upland berm was mapped as wetland because of its shape, and position within the northern portion of Wetland "B". The southwest wetland field, shrub area and the permanently flooded wetland are designated as Wetland "B". 3.2 Topography The topography of the eastern field slopes gently to the west toward Springbrook Creek. Wetland "A" is a six to eight foot deep depression surrounded with fill slopes. Wetland "B" is a five to ten foot deep depression with fill slopes along the north and west boundaries, and a levee on the east boundary. The wetland depression continues south off of the subject property. The northwest field slopes gently to the east toward Springbrook Creek. Wetland T-1412-01 7 SHAAN&WILSON,INC. "C" is an eight foot deep depression surrounded with steep fill slopes. Based upon information obtained from a U.S. Geological Survey Topographical Map, the topography of the subject property ranges from approximately five to twenty feet above mean sea level in elevation. 3.3 Fauna Fauna noted during the site visit included mallards, one Great Blue Heron in Springbrook Creek, goldfinches, swallows, two red-tailed hawks, California quail,various songbirds, and Northwest garter snakes. Endangered, and\or threatened animal species were not observed during the site reconnaissance. 3.4 Ve eg tation Species and dominance of vegetation were observed and noted at 7 plot/test holes on the subject property. The approximate locations of these plot/test holes are shown on Figure 2. The dominant wetland tree and sapling species on the site was willow. Red osier dogwood was the dominant wetland shrub species. Reed canarygrass, cattail, and yellow iris are all dominant E wetland herbaceous species on the site. There were no dominant upland tree species on the site. Blackberry, scotch broom, and thistle i are the dominant upland shrub species. Pasture grasses such as orchard grass, bentgrass and ` fescue are the dominant upland herbaceous species on the site. Field sheets detailing observa- tions for vegetation are included in Appendix E. A listing of wetland and upland plant species observed on the site are shown in Tables 1 and 2, respectively. 3.5 During the site reconnaissance, soil conditions, including color, texture, and approximate moisture content were observed and recorded at seven plot/test holes on the subject site. The indicators used to identify hydric soil are summarized in Table 3. Soil types observed on the subject site ranged from a gravelly sandy loam (fill) to a fine sandy loam to a silt loam. Hydric soil characteristics were observed in four of the seven plot/test holes (Table 4). Field sheets detailing observations for soils are included in Appendix E. T-1412-01 8 SHAAN&WILSON.INC. 3.6 Hydrology Hydrologic conditions including saturated soils and inundation as well as indicators of wetland hydrology, as defined by the Federal Manual for Identifying and Delineating Jurisdictional Wetlands, were observed within four of the seven plot/test holes (see Table 4). Field sheets detailing observations of hydrologic conditions are included in Appendix E. Wetland "A" discharges into the southeastern on-site portion of Springbrook Creek through a ditch. At the time of the site visit Wetland "A" did not contain standing water or saturated soils. A 36 inch diameter culvert discharges into the northwest corner of Wetland "B". Water from the northern portion of Wetland "B" leaves this wetland through a 24 inch culvert that discharges into Springbrook Creek. At the time of the site visit water approximately 2 feet deep was observed in the northern portion of Wetland "B". Water from the southern portion of Wetland "B" flows through a ditch and discharges into Springbrook Creek through a 24" culvert (Plate 2). At the time of the site visit saturated soils were present in the southern portion of Wetland "B". A 60 inch diameter culvert discharges into the eastern end of Wetland "C". Water from Wetland "C" leaves this wetland through a 60 inch culvert that discharges into the northeastern t on-site portion of Springbrook Creek. At the time of the site visit water approximately one foot deep was observed flowing in Wetland "C". 4.0 WETLAND AREAS Based upon the use of the triple parameter approach defined within the Federal Manual for Identifying and Delineating,Jurisdiction Wetlands, three areas on the subject site were found to contain wetlands. Species of vegetation, soil conditions, and hydrologic conditions were observed at seven plot/test holes on the subject site (see Table 4 and 5). The final wetland boundary was refined through additional observations of vegetation, soils, and hydrologic conditions between a plot/test holes exhibiting wetland characteristics and a plot/test holes exhibiting upland characteristics. The on-site wetlands were classified as wetlands due to the presence of all three wetland parameters (Table 4). T-1412-01 9 • SHAAN&WILSON.INC. 4.1 Wetland "A" Wetland "A" is a Lower Quality Wetland containing three wetland classes, a palustrine forested wetland, a palustrine scrub-shrub wetland, and a palustrine emergent wetland. Wetland "A" is located along the eastern property boundary, and the on-site portion of this wetland is approximately 1.35 acre (58,472 ft2) in size. The eastern boundary of Wetland "A" is located off-site, and was not delineated. One plot/test holes (plot/test hole 2) was inspected in the vicinity of this wetland to identify the presence of hydrophytic vegetation, hydric soils, and characteristics indicative of wetland hydrology (Table 4). Wetland "A" is between 50 and 200 feet wide, approximately 1,100 feet long, and is a six to eight foot deep depression surrounded by fill slopes. Hydrology in Wetland "A" appears to be present due to precipitation and shallow groundwater. Culverts and discharge points into the wetland were not located during the site visit. Water leaves Wetland "A" through a ditch located in the southern portion of the wetland. This ditch discharges into Springbrook Creek. At the time of the site visit saturated soils and standing water were not present within the wetland. Vegetation in the northern portion of Wetland "A" is dominated by willow, cottonwood, nightshade, and reed canarygrass. The southern half of the wetland is dominated by cattails and yellow iris in the base of the wetland, surrounded by willow, and cottonwood on the slopes. t 4.2 Wetland "B" Wetland "B" is a Lower Quality Wetland containing two wetland classes, a palustrine scrub- shrub wetland, and a palustrine emergent wetland. Wetland "B" is located in the southwestern corner of the site, and the on-site portion of this wetland is approximately 4.21 acre (183,184 ft2) in size. The southern and western boundaries of Wetland "B" are located off-site, and were not delineated. Two plot/test holes (plot/test holes 6 and 7) were inspected in the vicinity of this wetland to identify the presence of hydrophytic vegetation, hydric soils, and characteristics indicative of wetland hydrology (Table 4). Wetland "B" is a triangular shaped wetland, and is a five to ten foot deep depression with fill slopes along the north and west boundaries, and a levee on the east boundary. The wetland depression continues south off of the subject property. A narrow berm is located between the northern and southern portions of Wetland "B". A 36 inch diameter culvert discharges into the northwest corner of Wetland "B". Water from the northern portion of Wetland "B" leaves this T-1412-01 10 SHANON&WILSON.INC. wetland through a 24 inch culvert that discharges into Springbrook Creek. At the time of the site visit water approximately 2 feet deep was observed in the northern portion of Wetland "B". Hydrology in the southern portion of Wetland "B" appears to be present due to precipitation, shallow groundwater, and seepage from the base of the berm that separates the northern and southern portions of Wetland "B". Water from the southern portion of Wetland "B" flows through a ditch and discharges into Springbrook Creek through a 24" culvert (Plate 2). At the time of the site visit saturated soils were present in the southern portion of Wetland "B". vegetation in the northern portion of Wetland "B" is dominated by cattails and sedges. The southern portion of the wetland is dominated by willow and reed canarygrass. 4.3 Wetland "C" Wetland "C" is a Lower Quality Wetland containing two wetland classes, a palustrine scrub- shrub wetland, and a palustrine emergent wetland. Wetland "C" is located along the northeastern property boundary, and the on-site portion of this wetland is approximately 0.03 acre (1,329 ft2) in size. The northern boundary of Wetland "C" is located off-site, and was not delineated. One plot/test holes (plot/test hole 1) was inspected in the vicinity of this wetland to identify the presence of hydrophytic vegetation, hydric soils, and characteristics indicative of wetland hydrology (Table 4). Wetland "C" is between 50 and 100 feet wide, approximately 250 feet long, and is an eight foot deep depression surrounded with steep fill slopes. A 60 inch diameter culvert discharges into the eastern end of Wetland "C", and water leaves Wetland "C" through a 60 inch culvert that discharges into the northeastern on-site portion of Springbrook Creek. At the time of the site visit water approximately one foot deep was flowing in Wetland "C". Vegetation at the bottom of Wetland "C" includes sedges, and duckweed. The slopes of the wetland are dominated by red osier dogwood and willow. 5.0 WETLAND FUNCTIONS AND VALUES A Modified Reppert Values Evaluation (MRVE) was completed for each of the three wetland areas (Appendix F). T-1412-01 11 SHAN&WILSON,INC. 5.1 Wetland "A" Based on an interpretation of the MRVE, Wetland "A" has generally high to moderate functions and values. Wetland "A" has low values in its ability to provided shoreline protection. Wetland "A" has moderate values as an aquatic study area, its ability to store storm and flood water, and its ability to offer groundwater recharge capabilities. Wetland "A" has high values in its ability to offer water purification capabilities, and potential as a cultural resource. Wetland "A" has high to moderate values in its natural biological function, and its ability to offer hydrologic support functions. 5.2 Wetland "B" Based on an interpretation of the MRVE, Wetland "B" has generally high to moderate functions and values. Wetland "B" has generally moderate values in relationship to its natural biological functions, its use as an aquatic study area, its ability to store storm and flood water, and its ability to offer shoreline protection. Wetland "B" has generally high to moderate values in E ability to offer hydrologic support functions. Wetland "B" has generally high values in its ability to offer groundwater recharge capabilities, its potential as a cultural resource, and its ability to F offer water purification capabilities. l 5.3 Wetland "C" Based on an interpretation of the MRVE, Wetland "C" has moderate functions and values. Wetland "C" has generally low values in it ability to proved shoreline protection. Wetland "C" has moderate values in relationship to its natural biological functions, and its potential as a cultural resource, store storm and flood water, its ability to offer water purification capabilities, its ability to provide natural groundwater recharge, and its potential use as an aquatic study area. Wetland "C" has high to moderate values in its ability to offer hydrologic support functions. 6.0 WETLAND REGULATION Between January 1989 and August 17, 1991, the U.S. Army Corps of Engineers (Corps) used the Federal Manual for Identifying and Delineating Jurisdictional Wetlands (1989) to identify wetlands. The Corps is currently using the Corps of Engineers Wetlands Delineation Manual (1987) rather than the 1989 Manual. The transition from the 1989 manual to the 1987 manual T-1412-01 12 SHAAN&WILSON,INC. was mandated by the 1992 Energy and Water Development Appropriations Act, enacted on August 17, 1991. The City of Renton requires the use of the 1989 manual to identify wetlands. Therefore, this wetland delineation was completed using the 1989 manual. Wetland boundaries may differ depending upon which manual is used to identify the wetlands. Therefore, depending on which agencies have jurisdiction over wetlands on a specific project, wetlands may need to be evaluated using both the 1987, and 1989 manuals. If you plan on filling wetland on the subject property it will be necessary to delineate the wetland using the 1987 manual. It is expected that delineation of wetlands on this specific site will not be significantly different if identified using the 1987 manual. If you plan on filling wetland on the subject property it will be necessary to acquire an individual permit from the U.S. Army Corps of Engineers because the three on-site wetlands are hydro- logically interconnected to Springbrook Creek, which has a flow greater than 5 cubic feet per second. Individual permits are difficult and costly to obtain, and the applicant must demonstrate that the wetland impact is unavoidable and that other practicable alternative sites which impact less wetlands area are not available. Mitigation is required to offset all unavoidable wetland losses resulting from fill activities. Using the City of Renton Wetland Management Ordinance No. 4346 (March 1992) Wetlands "A", "B", and "C" would be classified as Category 3, Lower Quality Wetlands. These wetlands have been severely disturbed by human-related hydrologic alterations including diking, ditching, channelization and outlet modification, and have had soils alterations including the presence of fill, soil removal and soil compaction. The ordinance requires a 25 foot native vegetation buffer around the wetlands, since the site would have an urban Shoreline Master Program designation. A 20 foot building setback from the wetland buffer edge may also be required by the City of Renton Building Regulations. Springbrook Creek flows in a northerly direction through the center of the site. Springbrook Creek would require at least a 50 foot native vegetation buffer between the creek and any development, since the site would have an urban Shoreline Master Program designation. 7.0 CONCLUSIONS The soils, hydrologic conditions, and vegetation necessary for an area to be considered a wetland were found within three separate areas on the subject site. Wetland "A" is a palustrine forested T-1412-01 13 SHANON&WILSON,INC. (willow),palustrine shrub-scrub (willow),palustrine emergent(yellow iris)wetland located along the eastern property boundary. The on-site portion of Wetland "A" is approximately 1.35 acre (58,742 square feet (ftZ) in size. Wetland "B" is a palustrine scrub-shrub (alder), palustrine emergent (reed canarygrass/cattail) wetland located in the southwest quarter of the site. The on-site portion of Wetland "B" is approximately 4.21 acre (183,184 ftZ) in size. Wetland "C" is a palustrine scrub-shrub (willow), palustrine emergent (sedge) wetland located along the northeastern property boundary. The on-site portion of Wetland "C" is approximately 0.03 acre (1,329 ft2) in size. Using the City of Renton Wetland Management Ordinance No. 4346 (March 1992) the on-site wetlands would be classified as Category 3, Lower Quality Wetlands, and would requires a 25 foot native vegetation buffers around the wetlands. Springbrook Creek would require at least a 50 foot native vegetation buffer between the creek and any development. If you plan on filling wetland on the subject property it will be necessary to acquire an individual permit from the U.S. Army Corps of Engineers because the three on-site wetlands are hydro- logically interconnected to Springbrook Creek, which has a flow greater than 5 cubic feet per second. Individual permits are difficult and costly to obtain, and the applicant must demonstrate that the wetland impact is unavoidable and that other practicable alternative sites which impact less wetlands area are not available. Mitigation is required to offset all unavoidable wetland losses resulting from fill activities. 8.0 CLOSURE The findings and conclusions documented in this report have been prepared for specific applica- tion to this project and have been developed in a manner consistent with that level of care and skill normally exercised by members of the environmental science profession currently practicing under similar conditions in the area, and in accordance with the terms and conditions set.forth in our proposal dated September 1, 1992. The conclusions and recommendations presented in this report are professional opinions based on interpretation of information currently available to us and made within the operational scope, budget and schedule constraints of this project. No warranty, expressed or implied, is made. Wetlands boundaries identified by Shannon & Wilson are considered to be preliminary until the wetland boundaries flagged are validated by the Corps and/or the local jurisdictional agency. T-1412-01 14 SHANIN&WILSON.INC. Validation of the wetland boundary by the regulating agency(s) provides a certification, usually written, that the wetland boundaries verified are the boundaries that will be regulated by the agency(s) until a specified date or until the regulation are modified. Only the regulating agency(s) can provide this certification. Since wetlands are dynamic communities affected by both natural and man-made activities, changes in wetland boundaries may be expected. Therefore, wetland delineations cannot remain valid for an indefinite period of time. The U.S. Army Corps of Engineers (Corps) typically recognizes the validity of wetland delineations for a period of three years after completion. The City of Renton recognize the validity of wetland delineations for a period of two years. Any development activities on a site two or three years after the completion of this wetland delinea- tion report may require revision of the wetland delineation. In addition changes in Government Codes, regulations, or laws may occur. Due to such changes, our observations and conclusions applicable to this site may need to be revised wholly or in part. Sincerely, SHANNON & WILSON, INC. Theresa R. Henson Wetland Specialist Frank W. Pita, P.E., P.G. Vice President TRH:FWP/dgw T-1412-01 15 • _ 0 SHANNON&WILSON,INC. 9.0 LIST OF REFERENCES City of Renton, 1992, Building Regulations, City of Renton, Washington. City of Renton, 1990, Shoreline Master Program, adopted by Ordinance No. 3758. City of Renton, 1992, Wetland Management Ordinance, Ordinance No. 4336. City of Renton, 1992, Wetlands, Lakes, Rivers and Streams Maps. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe, 1979, Classification of Wetlands and Deepwater Habitats of the United States, U.S. Fish and Wildlife Service Publication FWS/OSB-79/31. Federal Interagency Committee for Wetland Delineation, January 10, 1989. Federal Manual for Identifying and Delineating Jurisdictional Wetlands. U.S. Army Corps of Engineers, U.S. Environmental Protection Agency, U.S. Fish and Wildlife Service, and U.S.D.A. Soil Conservation Service, Washington, D.C. Cooperative Technical Publication. Reed, P.B., Jr., 1988, National List of Plant Species That Occur in Wetlands: Northwest (Region 9), U.S. Fish and Wildlife Service Biological Report 88(26.9). Reppert, R.T., W. Sigleo, E. Stakhiv, L. Messman, and C. Beyers, 1979, Wetland Values Concepts and Methods for Wetland Evaluation, U.S. Army Corps of Engineers, Institute for Water Resources, Fort Belvoir, Virginia. U. S. Department of Agriculture, Soil Conservation Service, 1987, Hydric Soils of the United States, Prepared in cooperation with the National Technical Committee for Hydric Soils. U.S. Department of Agriculture, Soil Conservation Service (SCS), 1973, Soil Survey of King County Area Washington. U.S. Fish and Wildlife Service, 1988, National List Of Plant Species That Occur In Wetlands: Northwest (Region 9), Biological Report 88(26.9). U.S. Fish and Wildlife Service, 1973, National Wetland Inventory Map, Renton Washington, quadrangle. T-1412-01 16 — SAON&WILSON,INC. TABLE 1 IDENTIFIED WETLAND VEGETATION SPECIES* Trees Black Cottonwood (Populus trichocarpa) Red Alder (Alnus rubs) Western Red Cedar (Thuia plicata) Willow sp. alix Shrubs Black Hawthorn (Cratae us dou lasii) Douglas Spiraea (Spiraea dou lasii) Red Osier Dogwood (Cornus stolonifera) Salmonberry (Rubus spectabilis Herbs American Brooklime (Veronica americana) Bird's Foot Trefoil (Lotus corniculatus) Bittersweet Nightshade (Solanum dulcamara) Common Cattail CEypha angustifolia) Common Duckweed (I.emna minor) f Common Plantain (Plantago major) Common Velvetgrass (Holcus lanatus) Creeping Buttercup (Ranunculus repens) Curly Dock (Rumex crisp Giant Horsetail (Equisetum telmatia) Lady Fern (Athyrium filix-femina) Hardstem Bulrush (Scirpus acutus) Hedge Nettle (Stachys emersonii) Lyngby's Sedge (Carex lynpbyei) Morning Glory (Calyste is sepium) Pacific Water Parsley (Oenanthe sarmentosa) Redtop Bentgrass (Agrostis alba) Reed Canarygrass (Phalaris arundinaceae) Soft Rush (Juncus effusus) Stinging Nettle (Urtica dioica) Water Smartweed (Polygonum amphibium) Watson's Willow Herb (Epilobium ciliatum) Yellow Iris (Iris pseudacorus) This listing represents the major plant species identified. There may be other species pres- ent within the subject site that are not listed. T-1412-01 SHAIeI ON&WILSON.INC. TABLE 2 IDENTIFIED UPLAND VEGETATION SPECIES* Trees None observed Shrub Butterfly Bush (Buddleia davidii) Dewberry (Rubus vitifolius) Evergreen Blackberry (Rubus laciniatus) Himalayan Blackberry (Rubus discolor) Red Elderberry (Sambucus racemosa) Scotch Broom (Cytisus scoparius) Herbs Bracken Fern (Pteridium aquilinum) Bull Thistle (Cirsium vulgare) Canada Goldenrod (Solidago canadensis) Canada Thistle (Cirsium arvense Dandelion (Taraxacum off cinale) Fireweed (Epilobium angustifolium) Foxglove (Digitalis purpureum) Japanese Knotweed (Polygonum cus idp atom) Lanceleaf Plantain (Plantago lanceolate) Pearly Everlasting (Anaphalis margaritacea) Orchard Grass (pact, ly is glomerata) Quack Grass (Agropyron repens) Sweet-Pea (Lath, rub s tingitanus) Tansy (Tanacetum vulgaarre) Tall Fescue (Festuca arundinaceae) White Clover (Trifolium repens) This listing represents the major plant species identified. There may be other species pres- ent within the subject site that are not listed. T-1412-01 SHION&WILSON,INC. TABLE 3 HYDRIC SOIL INDICATORS Hydric Indicator Diagnostic Criteria Organic Content > 50% by volume (constitutes an organic soil). Sulfidic Material "Rotten egg" odor. Soil Color Matrix Chroma of 3 or less in sandy soils. Matrix Chroma of 2 or less in mottled soils. Matrix chroma of 1 or less in unmottled soils. Gleyed colors. Water Saturation Soil saturated at 0.5, 1.0, or 1.5 feet from the surface (dependant on the soils drainage class and permeability) for a significant period (usually a is week or more during the growing season. Soil Color Definitions Hue: Indicates the dominant spectral color (i.e., red, yellow, green, blue, and purple). Value: Measure of degree of darkness or lightness of the color. Chroma: The measure of the purity or strength of the color. Source: Federal Interagency Committee for Wetland Delineation, January 10, 1989. Federal Manual for Identifying and Delineating Jurisdictional Wetlands. U.S. Army Corps of Engineers, U.S. Environmental Protection Agency, U.S. Fish and Wildlife Service, and U.S.D.A. Soil Conservation Service, Washington D.C. Cooperative technical publication. T-1412-01 — SHAPON&WILSON,INC. TABLE 4 RESULTS OF TRIPLE PARAMETER APPROACH FOR EACH PLOT/TEST HOLE Plot/Test Hole Wetland Hydric Wetland Wetland Ve2etatio Soils Hydrology Determination 1 Yes Yes Yes Yes 2 Yes Yes Yes Yes 3 No No No No 4 Yes No No No 5 No No No No 6 Yes Yes Yes Yes 7 Yes Yes Yes Yes r T-1412-01 — SHAPNON&WILSON,INC. TABLE 5 HYDROLOGIC REGIMES AND WETLAND CHARACTERISTICS Degree of Inundation Duration of Inundation Wetland or Saturation or Saturation* Characteristics Permanently inundated " 100% present Semi-permanently to nearly z 75 - < 100% present permanently inundated or saturated ... Regularly inundated or z 25 - < 75% usually present saturated Seasonally inundated or z 12.5 - < 25% often present present Irregularly inundated or z 5 - < 12.5% often absent saturated Intermittently or never < 5% absent inundated or saturated * percent of growing season ** inundation > 6.6 feet mean water depth *** inundation <_ 6.6 feet mean water depth Note: Saturation implies that the soils are saturated to the grounds surface at some point in an average rainfall year. Soil saturation to the surface normally occur when the water table is (a) 0.5 feet from the surface for somewhat poorly drained mineral soils, (b) 1.0 feet from the surface for highly permeable, poorly drained, or very poorly drained mineral soils, (c) 1.5 feet from the surface for low permeability, poorly drained, or very poorly drained mineral soils, and (d) at depth where saturation occurs more than rarely in poorly drained or very poorly drained organic soils, for a significant period (usually a week or more) during the growing season. Source: Federal Interagency Committee for Wetland Delineation, January 10, 1989. Federal Manual for Identifying and Delineating Jurisdictional Wetlands. U.S. Army Corps of Engineers, U.S. Environmental Protection Agency, U.S. Fish and Wildlife Service, T-1412-01 -13 P :' .�, l H•_ .�\, h I� / h -- --B ------ —t — _ — (( -: — - .. �•` 13 fIL'.q .a -L Imo• L'� , ow I r 1I Coll QUursr ': IU _ 1 1 --��W2'Ia k 9 I ■ •s 1 30 ' =`` / W LIN 10 HFRN No T� (Cl,• �. ;y J Se age V ��j ;�.r,1•Zttiyosalr i l3 �; �• af'r�_:, (�' I •i I P j1 � r•� -Wit`__�_ •� ,. n �. \ :iongacrej'-:- R —1 �• ��w ;r I ri — , rack 1 Reservoir ` 1 12 PROJECT LOCATION p ; d , - -- —25 .30 �M is �I; 2 I(�`.•� n • 16 - all I 0 1/4 1/2 1 Van Woerden Tract Scale in Miles Renton, Washington NOTE VICINITY MAP Map adapted from USGS metric October 1992 T-1412-01 topographic map of Renton, WA quadrangle,dated 1973. SHANNON &WILSON, INC. Geotechrical end Environmental consiilants FI Ca. 1 a ' aNOW x , Ditch A I t d `WETLAND , 3♦ s PARCEL B 7 ` � 60'CMP x: �" I I ; r 'flQ': e eta 1s F � 3 PARCEL A 4 '' 24'CMP� � ! I k MY I F 0 100 200 , b � LEGEND Scale in FeetApproxKte a ' ! Van Woerden Tract ----- 4♦ Berm Location Plot/Test Hole Designat on--__--_—___ x r Renton,Washington 1 __ fl %�� and Approximate Location -�" -----..__ .� s � �, � 0 wetland NOTE --- WETLAND SITE PLAN Site plan adapted from drawing provided by Bush,Roed$Hitchings,Inc.,dated 36'CMP : October 1992 T-1412-01 4�2 Photo Locations September 1992. ,, .aa.;• tea ' SHANNON h WIL.rtSON,wc. FIG.2 Geoa:�,n:arc[o��c� n wnwm �( VV - I \ VV N i. W - 2\ \ S - 6 W _ 3 - �/ PROJECT S - 3 LOCATION W - L -- W - ��, - 1 61 • '®� ; W - 12 --- �( k---L�VrW - 1 4 WT-- 22 W- 32 ry W _ 3�>r i; W - 33 ' �S - 8 ' I C4--- S w� W - 3 0 1/4 1/2lb I 1 Van Woerden Tract Scale in Miles Renton, Washington NOTE CITY OF RENTON WETLANDS MAP Map adapted from City of Renton wetlands, lakes, rivers and streams October 1992 T-1412-01 map, dated 2-7-92. SHANNON &WILSON, INC. I FIG. 3 Geotectnical and Environmental ConsuRants • . N RAILROAD_ r".i,:f;. , : b d PFOY l 'XI � ./ 13 GyoYL uru• MT PFOW I oRTHfRN' sa 130M "• -:.1. EMWLj �'1� - 'T! ��- ••tJ u,\ wI`�•SZ:INr%atY '/�• ram'ck I u Racf • l r:"I D M 29:� U — • 4 I r r I I n Reservoir •I, lr' P;i PROJECTL JAB - ; LOCATION POW K Z PEMY 25 TM 16 2 PEMY PS � l i • - 0 1/4 1/2 1 Van Woerden Tract Scale in Miles Renton, Washington NATIONAL WETLAND NOTE INVENTORY MAP Map adapted from National Wetlands October 1992 T-1412-01 Inventory map, Renton quandrangle, US Fish and Wildlife Service, dated 1973. SHANNON &WILSON,INC. FIG. 4 GeoteetnkW and Em*wv nW Cw&dtents Ng Pu Ur PY ter,. ;•1, i —" i e N BeC Golflurse I ` £tom Wo A p • Ur *� I 8M 4�c Sew ge ORTHE , • u 0 Dis sal i 0 -15 Ur L, I r�•t J :12C ...�. qQ iI ;Longacre9; Pu i• D i Pu 515 Py s Ur Ur Wo ep ran .„Be s 11 �• r iit� • D j O i Track ^� U • u ,up• I ��.. Ur l ti i Ur 4+ Ng '. O R s rvoir W -- PROJECT S° ra Z " 1 LOCATION P" i " sk ' Q r 25 0 =: �Zoa CS U! 162 AgC n P y I rr I - Sk 1 n wo Ur = IUr �� ~ Ta 1 I - r a IIn i So 4-7. _ 7 Py Pu r I - Wo wO • Ur a �• -t Nk PY ,• .• r c c \ A. Ur a yi s�IBM r 3 W A Ng B C' •t t 1 =s,;M. SD t351 �� ° i g r ' T Ng ✓ 1 --_ 0 1/4 1/2 1 Van Woerden Tract Scale in Miles Renton, Washington NOTE SOIL CONSERVATION SERVICE MAP Map adapted from Soil Conservation Service, soil survey of the King County October 1992 T-1412-01 area, Washington, dated 1973. SHANNON & WILSON, INC. FIG. 5 Geotechnicai and Environmental Consultants • SHAON&WILSON,INC. APPENDIX A WETLAND DELINEATION METHODOLOGY k i i T-1412-01 SHAWN&WILSON,INC. APPENDIX A WETLAND DELINEATION METHODOLOGY The triple parameter approach of the Federal Manual for Identifying and Delineating Jurisdiction- al Wetlands (January 10, 1989) was used to delineate the extent of wetlands on the site. Under this methodology, vegetation, soils, and hydrology are each evaluated to determine the presence or absence of wetlands. Based upon local agency guidelines for the use of this method, an area is considered to be a wetland if three of the following conditions are met: (1) dominant hydrophytic vegetation is present in the area, (2) the soils in the area are hydric, and (3) the necessary hydrologic conditions within the area are met. The Plant Community Assessment Procedure and Plot Inventory Technique, as described in the Routine On-Site Determination Method (Federal Manual For Identifying And Delineating Jurisdictional Wetlands, January 10, 1989), were used for the evaluation of triple parameter criteria for this project. This methodolo- gy was selected because differences in vegetation types were easily observed, aiding in the identification of areas likely to meet the hydrology and soils criteria of the triple parameter approach. Wetland boundaries were determined by conducting a walking inspection of the property. As • f part of this inspection, species of vegetation, soil conditions, and hydrologic conditions are noted at several plot/test holes to more accurately determine the boundaries of on-site wetlands. Wetland Ve etation Hydrophytic plants are plants specially adapted for saturated and/or anaerobic conditions. The U.S. Army Corps of Engineers (Corps) and the USFWS has assigned an indicator status to many plant species that is based upon the estimated probability of the species existing under wetland conditions. Plants are categorized as Obligate(OBL), Facultative Wetland (FACW), Facultative (FAC), Facultative Upland (FACU), and Upland (UPL). Species with an indicator status of OBL, FACW, or FAC are considered to be adapted to saturated and/or anaerobic (i.e., wetland) conditions and are referred to as hydrophytic vegetation. Additional information concerning characteristics of hydrophytic plants may be found in Appendix D. Trees within a 30 foot radius and shrubs and herbs within a five foot radius of each plot/test hole were identified and noted. The approximate percentage of cover for each of the different T-1412-01 SH*ON&WILSON.INC. plant species occurring within the tree, shrub, and herb strata was determined. Dominant plant species are considered to be those that, when cumulatively totaled in descending order of abundance, exceed 50 percent of the areal cover for each vegetative stratum. Any additional species individually representing 20 percent or greater of the total areal cover for each vegetative stratum are also considered dominant. The indicator status of the dominant plant species within each of the vegetative strata was used to determine the presence of hydrophytic vegetation near each plot/test hole. A plot/test hole was considered to have hydrophytic vegetation if greater than 50 percent of the dominant plant species within the area had an indicator status of OBL, FACW, or FAC. Throughout the area delineated as wetland, identification of hydric soils was aided through observation of surface hydrology. The areal extent of hydric soils was defined through the direct soil observation within several plot/test holes placed both inside and outside of the wetland. Hydric Soils Hydric soils are defined as those soils which are saturated, flooded, or ponded for a significant period of time (usually seven consecutive days or more) during the growing season. As a result of anaerobic conditions, hydric soils exhibit characteristics directly observable in the field, r including high organic matter content, greenish or bluish grey color (gley formation), accumula- tion of sulfidic material, spots of orange or yellow color (mottling), and dark soil colors (low chromas). Additional information concerning hydric soil characteristics may be found in Table 3. All soil observations were completed within soil plot/test holes dug with a shovel to a depth of at least 18 inches below the existing ground surface. Soil samples were examined for the presence of hydric indicators. Soil organic content was estimated visually and texturally. The presence of sulfidic material was determined by the presence of sulfide gases (i.e., a "rotten egg" odor). Soil colors were recorded after being determined through use of the three aspects of color in the Munsell Soil Color Chart: hue, value and chroma (e.g., a soil designated as 10YR 6/2 has a hue of 10YR, a value of 6, a chroma of 2, and a soil color name of light brownish gray). A soil chroma of two in combination with soil mottling or a soil chroma of one without soil mottling typically indicates a hydric soil. Additionally, if soils were found to be saturated within 18 inches of the soil surface, they were considered to be hydric. T-1412-01 • SHAPWN&WILSON.INC. Wetland Hydrology Hydrologic conditions identifying wetland characteristics occur during those periods when the soils are inundated permanently or periodically, or the soil is continuously saturated to the surface for at least seven consecutive days during the growing season. The growing season begins when the soils reach a temperature of 41 degrees Fahrenheit in the zone of root penetra- tion. Additional information concerning hydrologic regimes associated with wetlands may be found in Table 5. The hydrology was evaluated by direct visual observation of surface inundation or soil saturation within 18 inches below the existing ground surface in test/plot holes. In the absence of direct observation of hydrology, the area near each plot/test hole was examined for indicators of wetland hydrology. These indicators include dried algae on bare soils, cracking of mud, soil mottling along live plant root channels, water marks on vegetation or rocks, and drainage patterns. It was not possible to observe conditions during the entire growing season. Therefore, it was assumed that wetland hydrology is present for at least seven consecutive days during the f: growing season within the area of the plot/test holes where positive indicators of hydrology were noted. T-1412-01 SHAN•N&WILSON.INC. APPENDIX B PHOTOGRAPHS T-1412-01 r t •}v, rr't.y 4�;•Y=r•,A?k rS� Z. wk :r ,� i a .Y \"•L lE >•0. �'*n� fay t, k _ t . `5�,.�� ,JCL``_. �•�. :4' '-�a �+'�:.� '� � , ._:"�� zt • 1 I .a' r ^» a_ T`.'�yvv .t.� t �..�v, r _ �s' �t ,/i;.` 1,� - r s _ 4.�;kv'•{vj,�ys"'r I•a � t,. i � � .aT•i�t� y"'� +- •'1 � !�} ., .r.��JT Av.� t �4•1.r �2J�. t{ r i !6 � ate x, •�• ) �•3 P Ft A� ,., 74J' I�;;�'�•$ '+ j �' �-w.'T •s��`.t+ Ott y.. !x .� � 1:•r;ra j. � a?��¢�� a-�11.±{ �r d � � ►F3 :s r •r .)�F1_H m `�? •i'^`z• "�C�.aP' '.•,+ 'I •_ .:► ,t�� ,t r�' ' � ��a t .:��ri1 �•1!:_ �1 '7'yir��i ��a� -� -i�� .rf:��'•1 �'�."vf.T"r''Y ".f T.•.. _ 57-1 f/ife� µ 'y)•,i� � T'ti.j?'f i�i 1' r. 7.'+!R mn Van Woerden Tract Renton, • • PHOTOS October 1992 •N & WILSON, INC. . 01 "All Ir - . dF - ��• i•r �` .1� -.Y J ..y� s Y lU �-:.11cr� V ..r.•..,t/�•�, t J� 1 _`f.�ti�. x�.Cy'�l�yf4� � �av- r,?�y�.��'•'r s�a.'`r �.� 'S'Y� b . .ytr+ ��. f r•' s'.'.,sl l• ' i_ .i. s`4�`c , t _ � ..,,�i�` �(.� 1 Tj -1?.,•ads ��.�!`•% ��.J��ii•} 'd'.�'r-.�:+-"�•-?. f �"��:..,�,�a -. .`,�': ,•I 7�' M L+�1w.'Sr �J• �J+ � `.'4Z ems. �')� rt}' T a '•iZ• ..•� ..�;..r �' � �-�i•7+��'�.L�.`(yt/,�-ter tl' �....'�♦ �• FZ�'�.f' 'S• +j/ .Z'+ •�1 i�'.III ..Y' A � PHOTOS • • . October 1992 - t�ly-/rT� t �t�,., t,. ,'4 .•�y r►`a !- "�-`,� , a .r ,j�Sr^Y i ` \'t:• .. ,"�_ .i':s � ��1�_`f:�•:•;. ii•t w'i► .1y.+�'.�.�s.r t ,: tit' \,�`►r, °�`1�� ► � , 1.,. s 1 t t \_. M`17.`„C.'i1'i'hyi+ y,/iii'� ;L��Y' w��` `l� .r�F.;: \•�a ✓�'\: (�• ♦ a• �•+ �i' r1~Ja. T r + '� r- y aii".r y; A� .fit. R. 1_. i 1r• Ya � .`.♦If i'.� 'ti �l� • i�'!+4� t ''V' / '��'r q_�_,• ,r�y�,l�Z`s � ' �t. 'mac � ' t * ��V`�� ,�,•1,�`� � \;3` \tom �- ,t �:7- jy::ram. �-; ,s,�sT:.�..�,r�'•'ri.:r 'y. -. r rt. �;Y� ♦ -.!�'' `.t^/�s'' l+y"�. .tom j� � •-S n,._ \,'. to - 1� - Yi. f= S .- ?its :,•� �'�.: i` �. to. f' 'J .*+ b _ i�c��i ".w .' � ; •!,/ : riot+ :tt• ti��' n/ t yy si Van r- Woerden Tract Renton, • • SHANNON & WILSON, . e. -r-rr ` s.'st 9-Y .:�f. G�a[s�-� 7RY.7�y�'/'rT..•-rw7>A+��'T��'•``��,t� � +s ��5�!�'� .: >S > 1+F -{•>`' rYN�C tY >7 ° j r !'�;�� t..Jr iZ't`'g T�`r• ;rTy� �•�' 3��4�,:'f+ _rai. Photo • \estem upland field. Van Woerden Tract Renton, • • PHOTO October 1992 SHANAN&WILSON,INC. APPENDIX C DEPARTMENT OF WILDLIFE NONGAME DATABASE INFORMATION (will be forwarded once it is received in our office) k T-1412-01 SHANtvL)N&WILSON,INC. APPENDIX D DEPARTMENT OF NATURAL RESOURCES DATABASE INFORMATION r. i= I T-1412-01 MM WASHNGTON STATE ARTMENT OF Natural Resources BRIAN BOYLE Commissioner of Public Lands OLYMPIA, WA 98504 October 22, 1992 Theresa Henson Shannon & Wilson Inc PO Box 300303 Seattle WA 98103 SUBJECT: Wetland Delineation in Renton (T23N R04E S24 SE) We've searched the Natural Heritage Information System for information on significant natural features in your study area. Currently, we have no records for rare plants, high quality native wetlands or high quality native plant communities in the vicinity of your project. The Natural Heritage Information System is a cooperative effort between the Department of Natural Resources' Washington Natural Heritage Program and the Department of Wildlife's Nongame Program. The Washington Natural Heritage Program is responsible for information on the state's endangered, threatened, and sensitive plants as well as high quality native plant communities and wetlands. The Nongame Program manages and interprets data on wildlife species of concern in the state. For information on animals of concern in the state, please contact the Nongame Program, Washington Department of Wildlife, 600 Capitol Way North, Olympia, WA 98501-1091. The Natural Heritage_ Information System is not a complete inventory of Washington's natural features. Many areas of the state have never been thoroughly surveyed. There may be significant natural features in your study area that we don't yet know about. This response should not be regarded as a final statement on the natural features of the areas being considered and doesn't eliminate the need or responsibility for detailed on-site surveys. I hope you'll find this information helpful . Sincerely, Sandy Norwood, Environmental Review Coordinator Washington Natural Heritage Program Division of Land & Water Conservation PO Box 47047 Olympia, WA 98504-7047 (206) 902-1667 Equal Opportunity/Affirmative Action Employer SHAOON&WILSON,INC. APPENDIX E DEFINITIONS OF PLANT INDICATOR STATUS USED ON FIELD DATA SHEETS Indicator Category Definition OBL Obligate Wetland. Occur almost always (estimated probability >99%) under natural conditions in wetlands. FACW Facultative Wetland. Usually occur in wetlands (estimated probability 67-99%), but occasionally found in uplands. FAC Facultative. Equally likely to occur in wetlands or uplands (estimated probability 34-66%). FACU Facultative Upland. Usually occur in uplands (estimated probability 67-99%), but occasionally found in wetlands (estimated probability 1-33%). UPL Obligate Upland. Occur in wetlands in another Region (as defined in the Nation List of Scientific Plant Names), but occur almost always (estimated probability r is >99%) under natural conditions in uplands in the region specified. NI No Indicator. These species have not been given an indicator status. They are k: assumed to be upland. Source: National List Of Plant Species That Occur In Wetlands: Northwest (Region 9). U.S. Fish and Wildlife Service Biological Report 88(26.9). 89 pp. SHANAON&WILSON,INC. APPENDIX E DEFINITIONS OF PLANT INDICATOR STATUS USED ON FIELD SHEETS t: is i.• is E: T-1412-01 • SHA04ON&WILSON.INC. MODE= TRIPLE PARAMETER APPROACH NVETLAND "C" Site Van Worden Tract Date 9-9-92 Staff TRH/AMY Plot# 1 VEGETATION Trees Status % Cover Herbs Status % Cover ♦ Red Alder FAC 5 ♦ Reed Canarygrass FACW 90* ♦ Black Cottonwood FAC 5 ♦ Canada Thistle FACU Trace ♦ Morning Glory FAC Trace Shrubs Status % Cover ♦ Willow sp. FACW 30* ♦ Red-osier Dogwood FACW 20* ♦ Canada Thistle FACU 5 * dominant species % of dominant species that are OBL, FACW, and/or FAC: 100% % cover of OBL, FACW, and/or FAC species: 150% Hydrophytic vegetation? Yes SOILS Series/Phase Puvallup On hydric soils list? No A horizon: depth 0-8" matrix color 2.5Y 4/3 Dry mottle color No depth of sample 4' Soil type: (sand, clay, etc.) Sandy Loam B horizon: depth 8-18" matrix color 2.5Y 7/2 mottle color 10YR 3/6 depth of sample 10' Soil type: (sand, clay, etc.) Sandy Loam Gleyed? No Other indicators None Depth of dominant vegetation root penetration 14" Approximate % organic content (by volume) 0% Consistency Non-plastic, Non-sticky Hydric soils? Yes Basis Chroma 2 with mottles HYDROLOGY Inundated? No Depth of standing water 0 Saturated soils? No Depth to saturated soils 0 Hydrologic indicators?_Wetland drainage patterns Describe obvious topographic features, if any: On bench above low flow in channel Wetland hydrology? Yes Basis Presumed on the basis of vegetation, soil and topography. Normal Circumstances? Yes Atypical situation? No Wetland determination Yes Basis Meets Three Wetland Criteria Comments: There is one foot of water in the channel discharging from a sixty inch diameter culvert. October 22, 1992 T-1412-01 Page 1 of 7 SHANK N&WILSON, INC. MODIFIED TRIPLE PARAMETER APPROACH WETLAND "A" Site Van Worden Tract Date 9-9-92 Staff TRH/AMY Plot # 2 VEGETATION Trees Status % Cover Herbs Status % Cover ♦ Willow Species FACW 50* ♦ Reed Canarygrass FACW 40* ♦ Black Cottonwood FAC 10 Shrubs Status % Cover ♦ Himalayan Blackberry FACU 5 ♦ Douglas Spiraea FACW 5 ♦ Bittersweet Nightshade FAC Trace * dominant species 90 of dominant species that are OBL, FACW, and/or FAC: 100% % cover of OBL, FACW, and/or FAC species: 105% Hydrophytic vegetation? Yes SOILS Series/Phase Puyallup On hydric soils list? No c A horizon: depth 0-5" matrix color 10YR 4/3 DM_mottle color None depth of sample 4" i Soil type: (sand, clay, etc.) Silt Loam B horizon: depth 5-18" matrix color 2.5Y 5/2 mottle color 7.5YR 3/3 depth of sample 8" ` E matrix color 2.5Y 6/2 mottle color 7.5YR 3/4 depth of sample 10" Soil type: (sand, clay, etc.) Silt Loam Gleyed? No Other indicators None Depth of dominant vegetation root penetration 5" Approximate % organic content (by volume) 0% Consistency Slightly plastic, Non-sticky Hydric soils? Yes Basis Chroma 2 with mottles HYDROLOGY Inundated? No Depth of standing water 0 Saturated soils? No Depth to saturated soils 0 Hydrologic indicators?_Wetland drainage patterns Describe obvious topographic features, if any: Drainage Swale, hydric soil. Wetland hydrology? Yes Basis Presumed based on indicators. Normal Circumstances? Yes Atypical situation? No Wetland determination Yes Basis Meets Three Wetland Criteria Comments: October 22, 1992 T-1412-01 Page 2 of 7 SHAPNON&WILSON.INC. MODIFIED TRIPLE PARAMETER APPROACH EAST UPLAND FIELD Site Van Worden Tract Date 7-10-92 Staff TRH Plot# 3 VEGETATION Trees Status % Cover Herbs Status % Cover ♦ None Observed ♦ Orchard Grass FACU 30* ♦ Common Velvetgrass FAC 10 ♦ Tall Fescue FACU 40* ♦ Quack Grass FACU 10 Shrubs Status % Cover ♦ Black Cottonwood FAC 5 ♦ Canada Goldenrod FACU 5 * dominant species % of dominant species that are OBL, FACW, and/or FAC: 0% % cover of OBL, FACW, and/or FAC species: 15% Hydrophytic vegetation? No SOILS Series/Phase Fill On hydric soils list? No r A horizon: depth 0-18" matrix color 5Y 4/3 mottle color None depth of sample 10" Soil type: (sand, clay, etc.) Gravelly Sandy Loam B horizon: depth matrix color mottle color depth of sample Soil type: (sand, clay, etc.) Gleyed? No Other indicators None Depth of dominant vegetation root penetration 16" Approximate % organic content (by volume) 0% Consistency Non-plastic, Non-sticky Hydric soils? No Basis Chroma 3 soil HYDROLOGY Inundated? No Depth of standing water 0 Saturated soils? No Depth to saturated soils 0 Hydrologic indicators? None observed Describe obvious topographic features, if any: Flat. Wetland hydrology? No Basis No saturated soil, inundation, or other indicators. Normal Circumstances? Yes Atypical situation? No Wetland determination No Basis Lacking Three Wetland Criteria Comments: October 22, 1992 T-1412-01 Page 3 of 7 SHANION&WILSON,INC. MODIFIED TRIPLE PARAMETER APPROACH NORTH OF WETLAND "B" Site Van Worden Tract Date 9-9-92 Staff TRH/AMY Plot #4 VEGETATION Trees Status % Cover Herbs Status % Cover ♦ None Observed ♦ Reed Canarygrass FACW 70* ♦ Canada Thistle FACU Trace ♦ Watson's Willow Herb FACW Trace Shrubs Status % Cover ♦ Black Cottonwood FAC 15 ♦ Canada Thistle FACU 5 ♦ Willow Species FACW 5 ♦ Himalayan Blackberry FACU Trace ♦ Common Cattail OBL Trace ♦ Japanese Knotweed NI Trace * dominant species % of dominant species that are OBL, FACW, and/or FAC: 100% % cover of OBL, FACW, and/or FAC species: 95% Hydrophytic vegetation? Yes SOILS f Series/Phase Puyallup On bydric soils list? No i A horizon: depth matrix color mottle color depth of sample Soil type: (sand, clay, etc.) B horizon: depth 0-18" matrix color MY 4/3 mottle color None depth of sample 10" Soil type: (sand, clay, etc.) Fine Sandy Loam Gleyed? No Other indicators None Depth of dominant vegetation root penetration 12" Approximate % organic content (by volume) 0% Consistency Non-plastic, Non-sticky Hydric soils? No Basis _Chroma 3 soil, no mottles or other indicators. HYDROLOGY Inundated? No Depth of standing water 0 Saturated soils? No Depth to saturated soils 0 Hydrologic indicators? None observed Describe obvious topographic features, if any: Flat. Wetland hydrology? No Basis No saturated soil, inundation, or other indicators. Normal Circumstances? Yes Atypical situation? No Wetland determination No Basis Lackine Three Wetland Criteria Comments: Standing water about 20 feet south near culvert. One station indicates that the water level elevation = 7 feet Water has a sewage smell. October 22, 1992 T-1412-01 Page 4 of 7 SHARON&WILSON.INC. MODIFIED TRIPLE PARAMETER APPROACH NORTHWEST UPLAND FIELD Site Van Worden Tract Date 7-10-92 Staff TRH Plot# 5 VEGETATION Trees Status % Cover Herbs Status % Cover ♦ None Observed ♦ Orchard Grass FACU 40* ♦ Redtop Bentgrass FAC 10 ♦ Tall Fescue FACU 40* ♦ Quack Grass FACU 10 Shrubs Status % Cover ♦ Canada Thistle FACU 10 * dominant species 90 of dominant species that are OBL, FACW, and/or FAC: 0% % cover of OBL, FACW, and/or FAC species: 10% Hydrophytic vegetation? No SOILS F` Series/Phase Puyallup On hydric soils list? No - 't A horizon: depth 0-18" matrix color 10YR 3/2 mottle color None depth of sample 10' Soil type: (sand, clay, etc.) Sandy Loam B horizon: depth matrix color mottle color depth of sample Soil type: (sand, clay, etc.) Gleyed? No Other indicators None Depth of dominant vegetation root penetration 14' Approximate % organic content (by volume) 0% Consistency Non-elastic. Non-sticky Hydric soils? No Basis Chroma 2 soil, no mottles. HYDROLOGY Inundated? No Depth of standing water 0 Saturated soils? No Depth to saturated soils 0 Hydrologic indicators? None observed Describe obvious topographic features, if any: High flat area. Wetland hydrology? No Basis No saturated soil, inundation, or other indicators Normal Circumstances? Yes Atypical situation? No Wetland determination No Basis _Lacking Three Wetland Criteria Comments- October 22, 1992 T-1412-01 Page 5 of 7 SHANNON&WILSON,INC. MODIFIED TRIPLE PARAMETER APPROACH WETLAND "B" Site Van Worden Tract Date 7-10-92 Staff TRH Plot#6 VEGETATION Trees Status % Cover Herbs Status % Cover ♦ None Observed ♦ Reed Canarygrass FAC 95* ♦ Soft Rush FACW Trace Shrubs Status % Cover ♦ None Observed *dominant species % of dominant species that are OBL, FACW, and/or FAC: 100% % cover of OBL, FACW, and/or FAC species: 95% Hydrophytic vegetation? Yes SOIL Series/Phase Woodinville On hydric soils list? Yes A horizon: depth 0-18" matrix color 5Y 511 mottle color 5YR 313 depth of sample 10' Soil type: (sand, clay, etc.) Silt Loam B horizon: depth matrix color mottle color depth of sample Soil type: (sand, clay, etc.) Gleyed? No Other indicators None Depth of dominant vegetation root penetration 14' Approximate % organic content (by volume) <50% Consistency Plastic, Non-sticky Hydric soils? Yes Basis Chroma 1 soil. HYDROLOGY Inundated? No Depth of standing water 0 Saturated soils? Yes Depth to saturated soils 8' Hydrologic indicators? Wetland Drainage Pattern. Describe obvious topographic features, if any: Large low depression. Wetland hydrology? Yes Basis Saturated soil. Normal Circumstances? Yes Atypical situation? No Wetland determination No Basis Meets Three Wetland Criteria Comments: October 22, 1992 T-1412-01 Page 6 of 7 S•N&WILSON,INC. MODIFIED TRIPLE PARAMETER APPROACH WETLAND 'B' Site Van Worden Tract Date 9-9-92 Staff TRH/AMY Plot# 7 VEGETATION Trees Status % Cover Herbs Status % Cover ♦ None Observed ♦ Common Duckweed OBL 5 ♦ Lyngby's Sedge OBL 20 Shrubs Status % Cover ♦ Common Cattail OBL 50* * dominant species % of dominant species that are OBL, FACW, and/or FAC: 100% % cover of OBL, FACW, and/or FAC species: 75% Hydrophytic vegetation? Yes SOIL Soil was not sampled. Soil was assumed hydric based on inundation. Series/Phase On hydric soils list? A horizon: depth _ matrix color mottle color depth of sample Soil type: (sand, clay, etc.) i•. B horizon: depth matrix color mottle color depth of sample Soil type: (sand, clay, etc.) Gleyed? Other indicators Depth of dominant vegetation root penetration Approximate % organic content (by volume) Consistency Hydric soils? Yes Basis Inundation. HYDROLOGY Inundated? Yes Depth of standing water 2' Saturated soils? — Depth to saturated soils — Hydrologic indicators? Wetland Drainage Pattern. Describe obvious topographic features, if any: Ditch Wetland hydrology? Yes Basis Inundation. Normal Circumstances? Yes Atypical situation? No Wetland determination No Basis Meets Three Wetland Criteria Comments: T1412-01.TBL rr1412-1kdAkd October 22, 1992 T-1412-01 Page 7 of 7 SHAVON&WILSON.INC. APPENDIX F MODIFIED REPPERT WETLAND VALUES EVALUATION SHEETS i i T-1412-01 SHAMON&WILSON,INC. APPENDIX F MODIFIED REPPERT WETLAND VALUES EVALUATION VAN WOERDEN TRACT: WETLAND "A" Value Rating Basis for Evaluation 1. Natural Biological Function HIGH TO MODERATE A. Food Chain Support Moderate 1. Net Primary Production High Wetland contains marsh vegetation. 2. Mode of Transport Moderate Linked to Springbrook Creek. 3. Food Chain Support Moderate Songbird use. B. General Habitat High diverse wetland with three plant com- munities. C. Special Habitat High Snags, banks with cover. 2. Aquatic Study Areas, MODERATE Sanctuaries, or Refuges Heron Rookery and Natural Shoreline Master Plan Designation one mile north. 3. Hydrologic Support Function HIGH to MODERATE A. Hydrologic Periodicity Moderate Linked to Springbrook Creek. B. Elevation in basin High Near open water system, Springbrook Creek. 4. Shoreline Protection LOW Narrow corridor approximately 200 feet wide along the creek. 5. Storage of storm and MODERATE flood water A. Flood Storage Factor Low Wetland less than five acres in size. B. Flood Retardation Factor High Greater than 30% of wetland vegetation is woody. T-1412-01 F-1 SHANNON&WILSON,INC. APPENDIX F MODIFIED REPPERT WETLAND VALUES EVALUATION (continued) VAN WOERDEN TRACT: WETLAND "A" Value Rating Basis for Evaluation 6. Natural Groundwater MODERATE Recharge Wetland is a seasonal system between 5 and 10 acres in size. 7. Water Purification HIGH A. Wetland Type High 1. Hydroperiod High Wetland is near Springbrook Creek. 2. Vegetation Density High Wetland plant cover is greater than 80%. B. Areal and Waste Loading Moderate Relationships 1. Total Wetland Moderate Total wetland system appears to be greater than ten acres in size. '. k 2. Proportion of Water Low Less than 40% of wetland is normally covered with water. 3. Proportion of Runoff High More than 50% of surface water runoff is retained in wetland for no more than t. a 2 year event. C. Location Factors High 1. Frost-Free Days High Over 250 frost-free days/year. 2. Location related to High Discharge from surrounding area has very high total fecal coliform levels, as high as 16,000 organisms per liter. 8. Cultural Values (Economics, HIGH Locally used for recreation and mayy Aesthetics, Recreational, have aesthetic value as a greenbelt tolhe Archeological Sites) local office building employees. T-1412-01 F-2 SHANNON&WILSON INC . APPENDIX F MODIFIED REPPERT WETLAND VALUES EVALUATION VAN WOERDEN TRACT: WETLAND "B" Value tin Basis for Evaluation 1. Natural Biological Function MODERATE A. Food Chain Support Moderate 1. Net Primary Production High Wetland contains marsh vegetation. 2. Mode of Transport Moderate Linked to Springbrook Creek. 3. Food Chain Support Moderate Moderate diversity of vertebrate animals. B. General Habitat Moderate At least emergent and scrub-shrub communities. C. Special Habitat High Snags, banks with cover. 2. Aquatic Study Areas, MODERATE Sanctuaries, Heron Rookery and Natural Shoreline or Refuges Master Plan Designation one mile north. 3. Hydrologic Support Function HIGH to MODERATE A. Hydrologic Periodicity Moderate Linked to Springbrook Creek. B. Elevation in basin High Near open water system, Springbrook Creek. 4. Shoreline Protection MODERATE Shoreline vegetation is between 100 and 200 yards wide. 5. Storage of storm and MODERATE flood water A. Flood Storage Factor Moderate Wetland is between five and ten acres in size. B. Flood Retardation Factor Moderate Between 10% and 30% of wetland vegetation is woody. T-1412-01 F-3 SHARON&WILSON, INC. APPENDIX F MODIFIED REPPERT WETLAND VALUES EVALUATION (continued) VAN WOERDEN TRACT: WETLAND "B" Value Rating Basis for Evaluation 6. Natural Groundwater HIGH Recharge Total wetland is greater than 10 acres in size, and has an open water compo- nent. 7. Water Purification HIGH A. Wetland Type High 1. Hydroperiod High Wetland is near a river, Springbrook Creek. 2. Vegetation Density High Wetland plant cover is greater than 80%. B. Areal and Waste Loading Low Relationships 1. Total Wetland Moderate Total wetland system appears to be between ten and 100 acres in size. 2. Proportion of Water Low Less than 40% of wetland is normally covered with water. 3. Proportion of Runoff High More than 50% of surface water runoff is retained in wetland for no more than a 2 year event. C. Location Factors High 1. Frost-Free Days High Over 250 frost-free days/year. 2. Location related to High Discharge from surrounding area has very high total fecal coliform levels, as high as 16,000 organisms per liter. 8. Cultural Values (Economics, HIGH Cultural and aesthetic values in todays Aesthetics, Recreational, society. Archeological Sites) T-1412-01 F-4 SHANNON&WILSON,INC. APPENDIX F MODIFIED REPPERT WETLAND VALUES EVAL ATION VAN WOERDEN TRACT: WETLAND "C" Value Rating Basis for Evaluation 1. Natural Biological Function MODERATE A. Food Chain Support Moderate 1. Net Primary Production Moderate Dominantly scrub-shrub vegetation. 2. Mode of Transport High Linked to Springbrook Creek. 3. Food Chain Support Moderate Songbird and possible fish use. B. General Habitat Moderate At least emergent and scrub-shrub communities. C. Special Habitat High Bands with cover, downed logs. 2. Aquatic Study Areas, MODERATE Sanctuaries, or Refuges Heron Rookery and Natural Shoreline Master Plan Designation one mile north. 3. Hydrologic Support Function HIGH to MODERATE A. Hydrologic Periodicity Moderate Linked to Springbrook Creek. B. Elevation in basin High Near open water system, Springbrook Creek. 4. Shoreline Protection LOW Narrow corridor, approximately 200 feet wide along the creek shore. 5. Storage of storm and MODERATE flood water A. Flood Storage Factor Low Wetland less than five acres in size. B. Flood Retardation Factor Moderate Between 10% and 30% of wetland vegetation is woody near base of wet- land. T-1412-01 F-5 SHANNON&WILSON.INC. APPENDIX F MODIFIED REPPERT WETLAND VALUES EVALUATION (continued) VAN WOERDEN TRACT: WETLAND "C" Value Rating Basis for Evaluation 6. Natural Groundwater MODERATE Recharge Small area. Water flowing year round. Soil is silty sand. 7. Water Purification MODERATE A. Wetland Type High to Moderate 1. Hydroperiod Moderate Permanent water system flooded by large and small storm events. 2. Vegetation Density High Wetland plant cover is greater than 80%. B. Areal and Waste Loading Low Relationships 1. Total Wetland Low Total wetland system appears to be less than ten acres in size. 2. Proportion of Water Low Less than 40% of wetland is normally covered with water. 3. Proportion of Runoff Low Less than 25 of surface water runoff is retained in wetland for no more than a 2 year event. C. Location Factors High 1. Frost-Free Days High Over 250 frost-free days/year. 2. Location related to High Discharge from surrounding area has very high total fecal coliform levels, as high as 16,000 organisms per liter. 8. Cultural Values (Economics, MODERATE The area is locally used for recreation. Aesthetics, Recreational, Archeological Sites) T-1412-01 F-6