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SWP272266(11)
CD 7C3O N -IL m U a� a� w o LL v W Final Report Wetland Delineation and Classification Report for the NE 10th Street/Anacortes Avenue NE Stormwater System Improvement Project Submitted to City of Renton G1�Y �� ,, T O� October 2001 CH2MHILL CH2MHILL Hans Ehlert and Tim White conducted the wetland delineation. Hans Ehlert prepared the Wetland Delineation and Classification Report. 40to 4an�t 1 Hans Ehlert Date Professional Wetland Scientist(Society of Wetland Scientists,#0001165) �� 0 2g o Tim Wh' e, Ph.D. Date Profess nal Wetland Scientist(Society of Wetland Scientists,#000305) Contents 1.0 Summary................................................................................................................................. 1 2.0 Purpose....................................................................................................................................3 3.0 Wetland Study Methodology.............................................................................................. 3 3.1 Pre-Field Data Collection.........................................................................................3 3.2 Wetland Analysis......................................................................................................3 4.0 Applicable Regulations 4.1 City of Renton Wetland Jurisdiction...................................................................... 5 4.2 U. S. Army Corps of Engineers Wetland Jurisdiction.......................................... 7 4.3 Washington State Department of Ecology Jurisdiction....................................... 8 5.0 Site Conditions......................................................................................................................8 5.1 Site History................................................................................................................. 8 5.2 Soils.............................................................................................................................8 5.3 Hydrology.................................................................................................................. 9 5.4 Wetland Descriptions............................................................................................. 10 6.0 Wetland Impact Avoidance............................................................................................... 14 7.0 References............................................................................................................................. 21 Appendices A Field Data Forms B U. S. Corps of Engineers Nationwide Permit 43 C Photographs Tables 1 U. S. Fish and Wildlife Service Wetland Indicator Status....................................................4 2 Renton Wetland Categories..................................................................................................... 6 3 Renton Wetland Buffer Requirements ................................................................................... 7 4 Wetland Summary.................................................................................................................. 10 Figures 1 Vicinity Map............................................................................................................................... 1 2 Site Map...................................................................................................................................... 2 3 Surveyed Wetland Map.......................................................................................................... 12 4 National Wetlands Inventory................................................................................................ 15 5 King County Wetlands Inventory 16 6 Renton Wetlands Inventory Map.......................................................................................... 17 7 King County Soil Survey........................................................................................................ 18 8 Water Features,May Creek Basin......................................................................................... 19 9 Lower Basin Conditions, May Creek Basin......................................................................... 20 SEXEA1598671WETLANDS DELINEATION REPORT\RENTON_WETLAND_FINAL.DOG V WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREET/ANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT 1.0 Summary The following report describes the analysis to determine the presence and extent of jurisdictional wetlands on the western 1.5 acres of the±2.25-acre Vuong property. The site is located just outside the City of Renton(City) in King County,Washington(Figure 1). However,if the City purchases the property,the City would annex it before developing the proposed stormwater project. The property,which consists of one parcel,is bounded to the south by NE 10th Street(SE 116th Street), to the east by Chelan Avenue,and to the west and north by residential lots (Figure 2).The site is currently undeveloped. This report is being prepared to help evaluate the feasibility of the site for a proposed stormwater detention pond. Two wetlands were identified: one on site and one off site. Both exhibited the three parameters characteristic of a wetland (i.e.,soils,vegetation, and hydrology).Wetland B was identified on site,is 3,070 square feet(W), and meets the City's criteria for a Category 3 wetland,except that it is less than 5,000 ft2; therefore, the City would not regulate this wetland,but the U. S. Army Corps of Engineers (COE) could.Wetland C was identified off site,is larger than 1,000 ft2, and meets the City's criteria for a Category 2 wetland. Both the City and COE would regulate Wetland C. The City's wetland categories indicate the quality and value of wetlands;the criteria are described later in this report. Possible impacts to Wetlands B and C could result from construction of the proposed stormwater detention pond. FIGURE 1 Vicinity Map Wetland Delineation and Classification Report F� �� ��•�� � yy � ���U- r-�p 1mi 1k►t 6 '1°Newca tl oalmC'ieeC f- ;.� fma c reek u �? L J Y � Ul JV 1 Wt o 'ateryr _ .1. I a,00d P- r Ma lewo d ei9 a k—i E ion . -P air 1999 k'L uest.00m Inc. 01999 Nav' aton Technob ies SEA\E:\159867\WETLANDS DELINEATION REPORT\RENTON_WETLAND_FINAL.DOC 1 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREET/ANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT FIGURE 2 Site Map Wetland Delineation and Classification Report 159867.OPo2_Sft Yap_911 dk .1 �1 Scale:-1"=500' SEA\\\SIMBA\PROJ\15986AWETLANDS DELINEATION REPORTRENTON_WETLAND_FINALDOC 2 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREET/ANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT 2.0 Purpose The purpose of this wetland delineation is to objectively determine the presence and extent of jurisdictional wetlands on the western 1.5 acres of the±2.25-acre Vuong property to help evaluate the feasibility of the site for a proposed stormwater detention pond. 3.0 Wetland Study Methodology 3.1 Pre-Field Data Collection Prior to conducting the on-site wetland analysis,existing information for the site was collected and reviewed. This information was overlaid on the project site map to identify potential wetland areas requiring detailed field investigation: • U. S. Fish and Wildlife Service (USFWS) National Wetlands Inventory(NWI),Mercer Island Quad • May Creek Current and Future Conditions Report (Foster Wheeler et al., 1995) • King County Sensitive Areas Map Folio (King County,1990) • U. S. Soil Conservation Service Soil Survey of King County Area, Washington (Snyder et al., 1973) and Hydric Soils List,King County Area, Washington (NRCS,2000) 3.2 Wetland Analysis 3.2.1 Methods CH2M HILL assessed the site for wetlands on August 10,2000,using methods of the Corps of Engineers Wetlands Delineation Manual (Department of the Army Environmental Laboratory, 1987) and the Washington State Wetlands Identification and Delineation Manual (Washington State Department of Ecology, 1997),for "Routine Determination'with on-site inspection. The wetland boundaries were delineated in the field by observing plant communities,evaluating soil conditions,and observing standing water and/or saturated soils. The delineated wetland boundaries were located using standard land surveying methods. Where access was allowed,wetlands on adjacent properties within 100 feet of the Vuong property were also delineated and classified, as required by City ordinance. Where access was denied,identification and classification of wetlands on adjacent properties was limited to visual observation from the Vuong property. Field data were collected to support the wetland delineation (Appendix A). Observations of vegetation,soils,and hydrology at representative sample plots (upland and wetland)were documented. Habitat identified as wetland was classified in the field using Cowardin et al. (1979). 3.2.2 Vegetation Presence of wetland vegetation was determined according to information found in the National List of Plant Species that Occur in Wetlands:National Summary for Region 9 (Reed, SEA\E:\159867\WETLANDS DELINEATION REPORT\RENTON-WETLAND_FINALDOC 3 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREETIANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT 1988) and the Supplement to National List of Plant Species that Occur in Wetlands:Northwest (Region 9) (USFWS, 1995).These sources assign wetland and nonwetland plants to a range of classifications,based on the prevalence of their occurrence in either wetland or upland areas. A plant's classification is referred to as its "indicator status" (i.e.,whether it indicates the presence of wetlands). Within a 2-meter radius of each sample plot,dominant plant species were determined for each vegetative stratum: herb,woody vine,shrub,sapling,and tree. Percent cover of most species in a plot was estimated and the indicator status recorded. Dominant species were assigned based on at least 20 percent cover within a stratum. Plots where more than 50 percent of the dominant species were facultative,facultative wetland,or obligate wetland species were considered to have hydrophytic vegetation(Table 1)and,therefore,to meet the wetland vegetation criterion. TABLE 1 U.S. Fish and Wildlife Service Wetland Indicator Status Wetland Delineation and Classification Report Classification Percent Occurrence in Wetlands Obligate Wetland(OBL) More than 99 Facultative Wetland(FACW) 67 to 99 Facultative(FAC) 34 to 66 Facultative Upland (FACU) 1 to 33 Obligate Upland(UPL) Less than 1 No Indicator(NI) Insufficient data to determine indicator status Source: Reed(1988). 3.2.3 Soils Data on soil texture and color,presence of mottles and/or concretions, organic matter content,moisture content, and presence of oxidized root zones were recorded.Using Munsell°color charts, soil matrix, and mottle colors (hue,value, and chroma) were determined immediately below the A horizon,or within the surface (10 inches) if no A horizon boundary occurred before that depth. MunseW'soil colors are reported in the wetland descriptions below in parentheses following the soil color description. Soils with low chromas (i.e., two with mottles present;one or less independent of mottles) or soils with high organic accumulations in the upper horizon(i.e.,muck or peat layers or heavy organic staining) indicated the presence of wetland or hydric soils and, therefore,meet the wetland soils criterion. 3.2.4 Hydrology Visual observations of soil saturation,surface inundation,visible drainage patterns, debris/sediment deposits, and surface scour were recorded. Depth to water in unlined boreholes was measured after allowing sufficient time for water to accumulate. If any of these characteristics were observed,wetland hydrology was considered to exist. SEA\EA159867\WETLANDS DELINEATION REPORT\RENTON_WETLAND_FINALDOc 4 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE LOTH STREETIANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT 3.2.5 Wetland Boundary p 9 and Sample Plot Markings Wetlands were delineated with red-and-white striped flagging numbered alphanumerically. Orange flagging marked numerically("SP-#")was used to mark sample plots where site- specific soils,vegetation, and hydrology data were collected and recorded. 4.0 Applicable Regulations pp 9 Wetlands regulations applicable(or expected to be applicable) to this project include those of the City,the U. S. Army Corps of Engineers (COE),and the Washington State Department of Ecology(Ecology). The site is currently located in King County;however,if the City decides to purchase it,the City would also annex it,and the site would then fall under the City's jurisdiction. Permitting would vary, depending on the specifics of any project proposed on the subject property. These agencies will ultimately determine the applicability of the regulations. 4.1 City of Renton Wetland Jurisdiction The City's wetland regulations are embodied in their critical areas regulations (Ordinance No. 4835,RMC 4-3-050). The purposes of their wetland regulations are to accomplish the following: a. Ensure that activities in or affecting wetlands not threaten public safety,cause nuisances, or destroy or degrade natural wetland functions and values;and b. Protect public health,safety,and welfare by minimizing and managing the adverse environmental impacts of development within and adjacent to wetlands;and c. Preserve,protect,and restore wetlands by regulating development within them and around them;and d. Protect the public from: (1) Preventable maintenance and replacement of public facilities needed when wetland functioning is impaired;and (2) Costs associated with repair of downstream properties resulting from erosion and flooding due to the loss of water storage capacity provided by wetlands;and (3) Unnecessary costs for public emergency rescue and relief operations;and (4) Potential litigation on improper construction practices occurring in wetland areas; and e. Provide City officials with information to evaluate,approve, condition, or deny public or private development proposals;and f. Prevent the loss of wetland acreage and functions, and strive for a net gain over present ' conditions. For establishing buffer widths,replacement ratios,and avoidance criteria, the City's ordinance (RMC 4-3-050-B.7.b) requires that wetland categories be designated according to the criteria in Table 2. SEA\E:\159867\WETLANDS DELINEATION REPORT\RENTON_WETLAND_FINAL.DOC 5 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREETIANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT TABLE 2 Renton Wetland Categories(per Ordinance 4835,RMC 4-3-050-B.7.b) 1 Wetland Delineation and Classification Report Category Description Category 1: Category 1 wetlands are wetlands which meet one or more of the following criteria: Very High 1. The presence of species listed by Federal or State government as endangered or Quality threatened,or the presence of essential habitat for those species;and/or Wetlands 2. Wetlands having 40 to 60 percent permanent open water(in dispersed patches or otherwise) with 2 or more vegetation classes;and/or 3. Wetlands equal to or greater than 10 acres in size and having 3 or more vegetation classes, one of which is open water;and/or 4. The presence of plant associations of infrequent occurrence; or at the geographic limits of their occurrence;and/or 5. Wetlands assigned the Unique/Outstanding#1 rating in the current King County Wetlands Inventory 1991 or as thereafter amended. Category 2: Category 2 wetlands are wetlands greater than 2,200 ft2 which meet one or more of the following High Quality criteria: Wetlands 1. Wetlands greater than 2,200 ft2 that are not Category 1 or 3 wetlands;and/or 2. Wetlands that have heron rookeries or raptor nesting trees,but are not Category 1 wetlands; and/or 3. Wetlands of any size located at the headwaters of a watercourse, but are not Category 1 wetlands,and/or 4. Wetlands assigned the Significant#2 rating in the current King County Wetlands Inventory 1991 or as thereafter amended; and/or 5. Wetlands having minimum existing evidence of human related physical alteration such as diking,ditching, or channelization. Category 3: Category 3 wetlands are wetlands greater than 5,000 ft2 which meet one or more of the following Lower criteria: Quality 1. Wetlands that are severely disturbed. Severely disturbed wetlands are wetlands which meet Wetlands the following criteria: a. Are characterized by hydrologic isolation, human-related hydrologic alterations such as diking,ditching,channelization,and/or outlet modification; and b. Have soils alterations such as the presence of fill,soil removal, and/or compaction of soils;and c. May have altered vegetation. 2. Wetlands that are newly emerging. Newly emerging wetlands are: a. Wetlands occurring on top of fill materials; and b. Characterized by emergent vegetation, low plant species richness, and used minimally by wildlife.These wetlands are generally found in the areas such as the Green River Valley and Black River Drainage Basin. 3. All other wetlands not classified as Category 1 or 2 such as smaller, high quality wetlands. Category designations for each wetland involved in this project are described below under Wetland Descriptions.Width of buffers required to protect wetlands is based on wetland categories,as shown in Table 3. Activities within regulated wetlands and/or buffers include both activities that directly remove or alter wetlands(e.g.,excavation,filling,placement of pilings or structures,vegeta- SEA\EM 59867\WETLANDS DELINEATION REPORT\RENTON_WETLAND_FINALDOC 6 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREET/ANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT tion removal) and activities that affect wetland functions(e.g.,disturbance of water levels, changes to water temperature or physical characteristics,application of pesticides or other chemicals). In addition to measures to protect directly affected wetlands, the City may require protection measures or erosion control measures to provide protection of a wetland and buffer when any of the regulated activities are proposed on a site,but are not within a wetland and/or buffer. Regional stormwater management facilities operated by the City may receive an exemption from the City wetland regulations and may be located in a critical area or buffer. TABLE 3 Renton Wetland Buffer Requirements Wetland Delineation and Classification Report Wetland Category Standard Width 1 100 feet 2 50 feet 3 25 feet Source: Renton Ordinance No.4835, RMC 4-3-050-M.6. SAll activities within regulated wetlands and/or buffers must be mitigated according to City Ordinance No.4835 (RMC 4-3-050-M.9). The overall goal of any compensatory project shall be no net loss of wetland function and acreage and to strive for a net resource gain in wetlands over present conditions. The concept of"no net loss"means to create,restore, and/or enhance a wetland so that there is no reduction to total wetland acreage and/or function. The City's Ordinance exempts Category 2 wetlands smaller than 2,200 ft2 and Category 3 wetlands smaller than 5,000 ft2 from regulation. 4.2 U. S. Army Corps of Engineers Wetland Jurisdiction Placement of fill in wetlands within the City is also regulated by the COE and requires a permit under Section 404 of the Clean Water Act(CWA) . Currently, the COE regulates only those wetlands delineated under its 1987 Corps of Engineers Wetlands Delineation Manual (Department of the Army Environmental Laboratory, 1987). The COE issues two types of wetland permits: individual and nationwide. Nationwide permits are prescriptive and apply to a limited set of activities that meet certain conditions. Recent changes to the nationwide permit program(U. S. Army,2000a) would apply to a qualifying project if unavoidable impacts to wetlands were proposed. Individual permits are required for activities that are not covered under the nationwide permit program. Depending on the specific details,Nationwide Permit 43 (NWP 43,Stormwater Management Facilities) might apply to this stormwater system improvement project. The complete text for NWP 43 is attached in Appendix B. Basically, this nationwide permit applies to discharges of dredged or fill material for the construction and maintenance of stormwater management facilities,including activities for the excavation of stormwater ponds/facilities,detention basins,and retention basins; the installation and maintenance of SEA\EA159867\WETLANDS DELINEATION REPORT\RENTON_WETLAND_FINAL.DOC 7 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE LOTH STREETIANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT water control structures, outfall structures and emergency spillways;and the maintenance dredging of existing stormwater management ponds/facilities and detention and retention ' basins,provided the activity meets specific criteria (Appendix B). Due to a recent court ruling, the COE may no longer regulate isolated wetlands. The U. S. Supreme Court recently rejected the COE's claim to jurisdiction over isolated,intrastate waters (Solid Waste Agency of Northern Cook County vs. U. S. Army Corps of Engineers, January 9,2001). The court's opinion goes beyond the migratory bird issue and means that no intrastate,isolated water is subject to the provisions of Section 404(a) of the CWA (regardless of any interstate commerce connection). Projects requiring a federal permit decision(i.e.,both nationwide and individual 404 permits) also require compliance with the Endangered Species Act (ESA) (U.S.Army,2000a and 2000b). Projects that are considered "not likely to affect" or "likely to affect" threatened and/or endangered species will require a biological evaluation/biological assessment (BE/BA). The COE is experiencing significant delays reviewing projects for ESA compliance and consulting with other federal agencies (e.g.,National Marine Fisheries Service [NMFS] and/or USFWS). As a result,nationwide permits,which were once relatively simple to obtain,now must be submitted well in advance of construction (in many cases a year or more) due to ESA. 4.3 Washington State Department of Ecology Jurisdiction Section 404(b)permits also require a Section 401 Water Quality Certification from Ecology. An individual 401 certification is required for certain projects affecting wetlands. Ecology has the authority during the permitting process to review development plans,impacts to wetlands, and the proposed mitigation measures. 5.0 Site Conditions 5.1 Site History The history of the subject site is not known. The site is currently undeveloped;however, at one time the site was cleared and seeded with common pasture grasses. The site might have once been used as pasture. Minor earthwork was done to cut a short ditch,which might convey septic overflow or gray water from the residence located at the southeastern corner of the site. Residential lots adjoin the site to the west. On several of these adjacent lots,fill has been placed,retaining walls constructed,and fences erected. 5.2 Soils The Soil Survey of King County Area, Washington (Snyder et al., 1973) reports Alderwood gravelly sandy loam as the dominant soil on the property. This soil type is not listed as a hydric soil (NRCS, 1992). However,actual soil conditions on site varied from what was reported. Alderwood gravelly sandy loam,6 to 15 percent slopes (Map unit AgQ. Alderwood soils are moderately well drained and have a weakly consolidated to strongly consolidated substratum at a depth of 24 to 40 SEA\EA159867\WETLANDS DELINEATION REPORT\RENTON_WETLAND_FINAL.DOC 8 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREETIANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT inches. These soils typically occur on uplands.They formed under conifers,in glacial deposits. However,it is not unusual for inclusions of poorly drained (hydric) soils such as Norma,Bellingham,Seattle, Tukwila, and Shalcar to occur in areas mapped as Alderwood. Permeability of this soil is moderately rapid in the surface layer and subsoil, and very slow in the substratum.Roots penetrate easily to the consolidated substratum where they tend to mat on the surface.Water moves on top of the substratum in winter. Available water capacity is low. Runoff is slow to medium, and the hazard of erosion is moderate. The geotechnical investigation (CH2M HILL,2001) completed concurrently with this wetland investigation discovered dark brown,stiff/medium dense sandy silt to silty sand with scattered organics at the ground surface. Approximately 20 to 25 feet of glacial till underlay the 2-to 3-foot-thick surficial layer. 5.3 Hydrology The site is located in the Honey Creek subbasin,which drains to the May Creek watershed, and eventually to Lake Washington. Albeit limited,coho salmon are known to rear and spawn in approximately the lower one-half mile of Honey Creek(Foster Wheeler et al., 1995),which is approximately one mile downstream from the Vuong property. The site is located at the headwater of a small,unnamed tributary(0285A) that drains into the upper part of Honey Creek (Foster Wheeler et al., 1995). However,development has occurred north of the site and it appears that the northern part of tributary 0285A has been culverted and is no longer an open channel connecting to Honey Creek. In addition,a large portion of Honey Creek north of the project site was culverted in the last 30 to 40 years. Fish passage to the upper portion of Honey Creek might be difficult or impossible due to impediments and blockages,beginning where Honey Creek runs under Union Avenue NE, approximately two-fifths mile northeast of the site. Water was not directly observed on the site during the delineation. However,indicators of hydrology were used to infer its presence or absence. Direct observation and measurement of surface water and shallow groundwater are more conclusive determinants of the presence and extent of wetland hydrology.To better understand the hydrology of the site, direct observation should occur in the early growing season(late February to early March). The geotechnical investigation (CH2M HILL,2001) summarizes the results of groundwater monitoring that was conducted from August 2000 to May 2001 using piezometers installed at the site. The piezometers were installed in boreholes 30 feet deep (B-1) and 8 feet deep (B- 1A). Piezometer B-1 detected water only for the first reading in August 2000, at a depth of 29.0 feet below ground surface (bgs);water was not detected during any other readings. Readings at Piezometer B-1A recorded groundwater fluctuations from 4.0 feet to 12.8 feet bgs. These results indicate that water is perched in the upper till layer throughout much of the year,if not year round. However,it should be noted that this year has been one of the drier years on record; therefore,groundwater levels may have been lower than normal. SEA\E:\15986AWETLANDS DELINEATION REPORT\RENTON_WETLAND_FINALDOC 9 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREET/ANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT 5.4 Wetland Descriptions CH2M HILL identified one wetland on site and one off site,which are summarized in Table 4.The soils,vegetation,hydrology,rating category, and functions of these wetlands are described below.The approximate location of each wetland is depicted in Figure 3. The wetland acreage reported is calculated from the survey of the delineated boundaries. The wetlands delineated are palustrine,which describes "...all non-tidal wetlands dominated by trees,shrubs,persistent emergent vegetation,emergent mosses,or lichens..."(Cowardin et al., 1979). Palustrine wetlands are further divided into classes and subclasses based on characteristics of their substrate,dominant vegetation,and flooding regime. During the delineation,normal environmental conditions were present in the area,and the growing season was well advanced. TABLE 4 Wetland Summary Wetland Delineation and Classification Report Approximate Cowardin class a Renton wetland Renton buffer Wetland wetland a category width (feet) B—On site 3,070 ft2 b PEMC 3° NA°'d C—Off site 1,033 ft2 e PFOC 2 50 d aCowardin et al. (1979): PEMC = palustrine emergent,seasonally flooded PFOC = palustrine forested,seasonally flooded bWetland area surveyed on site. °Category 3 wetlands less than 5,000 ft2 are exempt from Renton wetland regulations; however, it would still be regulated by the COE. dCOE may require vegetated buffers,but usually only related to mitigation plans. eRepresents off-site wetland area surveyed only within 100 feet of the site. 5.4.1 Wetland B General Description. Occurring completely on site,Wetland B is a small,isolated wetland with a surveyed area of 3,070 ft2(Figure 3). It is located in the west-central portion of the 1 site.See Appendix C for a photograph of Wetland B.Data from two sample plots were collected (Appendix A).This wetland was not identified on the NWI map (Figure 4),King County Wetland Inventory(Figure 5),Renton Wetlands Inventory Map (Figure 6), the King County soil survey(Figure 7),or May Creek Basin Water Features Map (Foster Wheeler et al., 1995)(Figure 8). This wetland is not accessible to fish and does not provide habitat suitable for fish rearing or spawning. Soils.Snyder et al. (1973)identified the soils as Alderwood gravelly sandy loam,which is not listed as a hydric soil in King County(NRCS,2000). However,soils observed in Wetland B in the B horizon (12 to 14 inches bgs) were very dark brown(10YR 2/2) gravelly silty loam with dark yellowish brown mottles (10YR 3/6),which does not match the description for Alderwood. See SP-02 in Appendix A. SEA\E:\159867\WETLANDS DELINEATION REPORT\RENTON_WETLAND_FINAL.DOC 10 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREEVANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT Soils observed in the B horizon (10 to 14 inches bgs) in adjacent uplands were dark yellowish brown (10YR 4/4),which more closely matches the description for Alderwood. See SP-01 in Appendix A. Vegetation.Wetland B is dominated by palustrine emergent vegetation(PEM),with several isolated shrubs. Vegetation is dominated by slough sedge(Carex obnupta;OBL). Also occurring,but not dominant,were soft rush (Juncus effusus;FACW), daggerleaf rush(Juncus ensifolius;FACW),small-flowered willowherb (Epilobium minutum;NL),bull thistle (Cirsium vulgare;FACU,red elderberry(Sambucus racemosa;FACU),colonial bentgrass (Agrostis tenuis;FAC), and cut-leaf blackberry(Rubus laciniatus;FACU+). Adjacent uplands are dominated by cut-leaf blackberry and colonial bentgrass,with scattered red elderberry,bracken fern (Pteridium aquilinum;FACU),timothy(Phleum pratense;FAC-),and velvet grass (Holcus lanatus;FAC). ' Hydrology. The sources of water to Wetland B are primarily precipitation and shallow seasonal groundwater from the adjacent drainage area.No streams or culverts flow into Wetland B,but a defined intermittent drainage flows from Wetland B (See Wetland C below). A ditch from the house to the east drains to Wetland B. This ditch is believed to be a septic overflow or gray water line. ' No standing water or soil saturation was observed during the field visit. The wetland appears to be seasonally flooded,but becomes dry in summer.Wetland B occurs in the headwaters of a small,unnamed creek that drains to Honey Creek and is identified in the May Creek Basin Lower Basin Conditions Map as stream 0285A (Foster Wheeler et al., 1995) (Figure 9). However,the northern part of the unnamed creek appears to have been culverted and is no longer an open channel. Also,a large portion of Honey Creek north of the site has been culverted. The presence of both wetland and upland plants in Wetland B indicates that water is present in the early growing season,but drains rapidly enough to allow upland plants an opportunity to establish and develop in the late spring,summer,and fall. Wetland Category.Applying the City's rating(Table 2),Wetland B is considered Category 3. The basis for this rating is that Wetland B is hydrologically isolated with low-diversity emergent vegetation that has been altered.Wetland B is less than 5,000 ft2. Category 3 wetlands less than 5,000 ft2 in size are exempt from the City's wetland regulations (RMC 4- ' 3-050-B.7.a). A letter of exemption from the City would be required. A permit or exemption to build in Wetland B would be required from the COE. Permitting ' with the COE would depend on the nature of the wetland impacts associated with the proposed stormwater system improvement project. As discussed above (Section 4.2,U. S. Army Corps of Engineers Jurisdiction and Appendix B),Nationwide Permit 43 for 1 stormwater management facilities would likely apply to this project. Mitigation might be required. However, due to the recent court ruling mentioned previously,it is also possible that the COE might not regulate this isolated wetland. r 1 SEA\EA159867TWETLANDS DELINEATION REPORT\RENTON_WETLAND_FINAL.DOC 11 - -- ----_-- ---- ------ ------ --- ------- -- -- -- --- --- ---- - -- - -- - C-4 CC-4 1 1 SITE LOCATION INFORMATION 1 t WE 1 L,�BOI/NDARY r ��9�� LEGAL DESCRIPTION SECTION 10, T23N, R5E 41C-3 PARCEL NUMBER 1023059129 CC-3a SP-OS ADDRESS 13642 SE 116TH ST. 1 1 1 1 1 WIRE FENCE t t f \ i i i t t•. i f t i r r i z SP-03 y t �` eBLACKBERRIE3 c � ; I; t y 3 t r r l E } 1 r i r t t t \ f PRELIMINARY t s t rs sl l \ POND LOCATION t t t 140' w r c,T1 U r i 4 1 t w BLACKBERRIES ED Z r r r i r i t a x P-04 r t t k t t r PIEZOMQTER r I� r s t BORING,B-1 3s1' , BLACKBERRIES` PIEZQMETER 3`1 BORING FOUND spa" REBAR FENCE t i 1 0 GAP IN POST , lr , t CH2M n 1060 r 4 {fl i s RE�gR 8 GAP , FENCELINE WETLAND1 N 1$5148.2`67 .` BOUNDARY E 1312801060;r r l i (SURVEYED I ELr418.4;v r ,` af�7 r rr AUG.9/00) 1 ; FOUN i IP W/DPLUG 1 `� g^4 1 r rl, 4"'ID TILE PIPE TOP OF PIPE - 419.75 B-8 r BOTTOM HALF OF PIPE SP-02 , i j'. t- r BROKEN AWAY FOUND 14�4„ ®' 1 i tr r r IP W/ PLUG Xi- r F / 3 A SP-01 8-2 4 z 4 i r r J ft w Z u a r r t t i) rX x r T r i FOUND r „ RE6AR 1, CAP_ SOIL rBL BERRIES ° 42T I � 36" BEGIN SPLIT BORING 9=`2 a ° r r s� i I1f RAIL FENCE Et FE o S.E.116TH ST. CH2M r 1020 N N NAIL 66 NE 10TH STREET/ E 1312312762.92.956 EL 418,25 ANACORTES AVE. NE DETENTION POND 0 20 40 60 Scale In Feet SURVEYED WETLAND MAP FIGURE 3 -------------------------------------------------------------- WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREET/ANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT Wetland Functions.Wetland B provides low biological support due to limited habitat features,small size,and adjacent residential land uses.Despite its small size,the dense ' vegetation in Wetland B likely improves water quality that might be affected by flow from a possible septic overflow or gray line outlet located approximately 60 feet uphill to the east. Wetland B provides some water storage,but this function is limited by its small size.Its small size and isolation also limit the hydrologic support function. 5.4.2 Wetland C ' General Description.Occurring off site to the north,Wetland C is a narrow,linear wetland associated with an intermittent drainage identified as stream 0285A(Figure 9) on the May Creek Basin Lower Basin Conditions Map (Foster Wheeler et al., 1995). However,there is no significant channel development in this reach. This wetland is not likely accessible to fish and does not provide habitat suitable for fish rearing or spawning. ' The portion of this wetland occurring within 100 feet of the subject property has a surveyed size of approximately 1,033 W.The wetland extends northward but was not delineated beyond 100 feet of the subject property.Data was collected from a sample plot in Wetland C (Appendix A).This wetland was not identified on the NWI map (Figure 4),King County Wetland Inventory(Figure 5),Renton Wetlands Inventory Map (Figure 6),or the King County soil survey(Figure 7). However,the May Creek Basin Water Features Map (Foster ' Wheeler et al.,1995) identifies Wetland 50 north of the subject property,forming the headwaters of a small tributary(0285A) to Honey Creek(Figures 8 and 9). The following is an excerpt from the May Creek Current and Future Conditions Report describing the habitat of Wetland 50(Foster Wheeler et al.,1995): ' Current Conditions: This 2.6-acre Class-2 wetland inventoried by the City of Renton is the headwater to a very small tributary(0285A) to Honey Creek.The wetland is predominantly forested with deciduous trees, including aspen(Populus tremuloides). A small portion has been converted to lawn. The wetland provides moderate to high levels of groundwater discharge,floodflow alteration,and wildlife habitat.In spite of these important functions,this wetland has been severely disturbed by filling and buffer removal. Residences appear to have been built in the wetland on fill,with cultivated backyards ending at the current wetland boundary. Cat and dog intrusion is intense,and considerable trash dumping has occurred. Future Conditions:This wetland occupies an important landscape position and provides significant beneficial functions. Because it is surrounded by residential development,this wetland will continue to be subjected to the same intensive disturbances it currently experiences,and will decline from ongoing vegetation removal,trash dumping,and the like.The wetland could benefit from a community clean-up and education effort. Soils.Snyder et al. (1973)identified the soils as Alderwood gravelly sandy loam,which is not listed as a hydric soil in King County(NRCS,2000).Soils in Wetland C were difficult to i SEA\EA159867\WETLANDS DELINEATION REPORT\RENTON_WETLAND_FINALDOC 13 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREET/ANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT observe because of the dense Y gravel layer located near the surface.Soils were assumed to be hydric due to indicators of standing and flowing surface water. Vegetation. The wetland is dominated by palustrine forested vegetation(PFO).The generally native,undisturbed vegetation in Wetland C is dominated by an overstory of Oregon ash(Fraxinus latifolia;FACW),black cottonwood (Populus balsamifera;FAC),and red alder(Alnus rubra;FAQ the understory is dominated by seedlings and saplings,suggesting that the hydrologic regime is being maintained. Understory vegetation occurring,but not dominant,includes soft rush,clustered rose (Rosa pisocarpa;FAC),Himalayan blackberry (Rubus discolor;FACU),English ivy (Hedera helix;NL),and creeping buttercup (Ranunculus repens;FACW). Hydrology. The sources of water to Wetland C are primarily precipitation and shallow seasonal groundwater from the adjacent drainage area. No streams flow into Wetland C. ' Although actual inundation or saturated soils were not observed,hydrologic indicators present include evidence of surface scour,standing water(bare soil with stained,matted leaves),beer cans and a baking pan,which likely were carried into the wetland and deposited by water. The wetland appears to be intermittently flooded,but becomes dry in summer. Wetland C forms the headwaters for an unnamed stream that drains to Honey Creek. However, the northern end of the unnamed stream appears to have been culverted. Also,a large portion of Honey Creek downstream of the project site has been culverted. Wetland Category. Applying the City's rating (Table 2),Wetland C is considered Category 2,requiring a 50-foot buffer(Table 3).The basis of this rating is that Wetland C is hydrologically connected and is located at the headwaters of an intermittent watercourse. Wetland C would be regulated by both the COE and the City;therefore,construction in the ' wetland or its buffer would require a permit or an exemption. Wetland Functions.Wetland C provides moderate biological support due to its structural diversity;however, this support is limited by disturbance from the adjacent residential land uses. The combination of shallow gradient,occasional depressions,and vegetation in Wetland C likely helps maintain water quality.Wetland C provides some water storage in the depressions,but this function is limited by its narrow configuration. The hydrologic support function is also limited by its small size and intermittent character. 6.0 Wetland Impact Avoidance Any unavoidable impacts to Wetlands B and C related to the proposed stormwater detention pond would be determined during the detailed engineering design and would be mitigated according to applicable regulations. The consequences of pond construction in this area could be drawdown of Wetland C or a change in flow to the wetland. Mitigation for or prevention of these consequences will be examined. SEXEA159867WETLANDS DELINEATION REPORT\RENTON_WETLAND_FINALDOC 14 V iz;TA rX i s� 4.f11lIR IM 1 r MWE Y6i�M:Y •ei��JG RI%�ae - a � VA! [ �. � '.a': WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREETIANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT FIGURE 6 ' Renton Wetlands Inventory Map Wetland Delineation and Classification Report MERCER r' 1 ISLAND XS BOREN NEWCASTL _- = --- COAL CREEK 7RIBUTAR/6S in_w_---------._:�;:. `AxAn A?l J_j�AwA h'h _ � q L ODA yAY _C��Bf 1 c� 1 SITE x a ` -A 1`I lO a\ b�K6 VG yy W.dY•' o \ V �i N Yd 1 1 y i •u � w Wetlands For Reference Only 0 5500 11000 a ' 1:66000 Renton Municipal Code Roads ' ( + - _ Wetlands �J Streams�17 March 2000 Rivers— Lakes City Boundary SEXEM59867\WETLANDS DELINEATION REPORT\RENTON_WETLAND_FINALDOC 17 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE LOTH STREET/ANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT FIGURE 7 ' King County Soils Survey Wetland Delineation and Classification Report IN ..4 OvD Ev6 a •�,,�.< 3 • GRA VFL " ESP Ij • - I t �9 � +• _ :ri r z �• Bh � n Y � • 1 �' � ,M •tl BM ti • �: _.t.� _ BMA, J` �' O• •# ` AAgCCrl .n qz • +sa ,fig ••.• a • 1-7- k UN � .Y` .,�, ♦`', �ry �� "" a ie'f'1 �1 rQ Sl^ ry. "•' �+ 'h J ri "4 ' ' it Z Y '. .� _ ; � . �''' f•.. i R I .j ��■ ■ �'-�� Yak;• .� .., f�• II '. .. . e: f$ �_ ; ::':�i, teenwood TGe ^# ��. # . '�3uFF'n.� 1 t• SEXEA15986nWETLANDS DELINEATION REPORT\RENTON_WETLAND_FINAL.DOC 18 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREET/ANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT FIGURE 8 Water Features,May Creek Basin (Foster Wheeler et al., 1995) Wetland Delineation and 0 Classification Report � P �- 1 01 N Map 1 `' Y. Water Features `- May Creek Basin 1611A A. SE itv '`� pj°10 0� { °1° o 1ASt6 A.. SE -� o G1te1111 C1r:k�\ i t z aroma°~ —-—-—-—-— ' ° N I 1 _J----�� I a / _ _ ®4 p4 °10b Co C..• � 0„� Jal.d AA— SE ua p • o oti°s V o .,) 3 °1 Z N D E z p76.SA Z O En E o a N ` > tu4.'1'O a / m N > O f.• I ) L I SEA\E.\159867\WETLANDS DELINEATION REPORT\RENTON_WETLAND_FINAL.DOC r 19 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE LOTH STREETIANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT r FIGURE 9 Lower Basin Conditions,May Creek Basin (Foster Wheeler et al., 1995) Wetland Delineation and Classification Report Map 14 Lower Basin Conditions May Creek Basin o � Lake Washirtsto /I Q02 Lake U1�87.1 Horan • li I � • \ q � \�'bc Px' LS eA \J v ♦♦ `! \� N MoY 'i ` 0, • ,,�!� I I a + F n 1O O[� �282 ,.cl 0 1 ore ♦ ` ,,,,, ae< N r_ f. Basin Boundary - o— Subarea Boundary m �p9 F �— Stream&Stream Number _ -- 4poS Lake /., . ♦♦ ^� Wetland 0S S}t Concentrated Spawning Area > I l Problem Area ♦ i Olocally Significant Resource Area ` Wetland Habitat Problem Stream Habitat Problem N SITE Flooding Problem n v io V Water Quality Problem M Erosion Problem 0 y, t Mile � n., Sediment Deposition Problem SEA\E:\159867\WETLANDS DELINEATION REPORT\RENTON_WETLAND_FINAL.DOC 20 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE LOTH STREET/ANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT 7.0 References CH2M HILL. 2001. Final NE 10th Street/Anacortes Court NE Stormwater System Improvement y Project, Geotechnical Data Report. Prepared for City of Renton,Renton,WA. May 2001. City of Renton. 2000. Critical Areas Ordinance, Ordinance No. 4835. Renton,WA. Adopted: March 27,2000;Effective: April 30,2000. Cowardin, LM,Carter V,Golet TC,LaRoe ET. 1979. Classification of wetlands and deepwater habitats of the United States. U. S. Fish and Wildlife,FWS/OBS-78/31. Department of the Army Environmental Laboratory. 1987. Corps of Engineers Wetlands Delineation Manual. Technical Report Y-87-1,U. S. Army Engineer Waterways Experiment Station,Wetlands Research Program, Vicksburg,MS. King County. 1990. Sensitive Areas Map Folio. King County,Seattle,WA. December 1990. Foster Wheeler, King County, and City of Renton. 1995.May Creek Current and Future Conditions Report. Foster Wheeler Environmental Corp.,King County Department of Public Works,and City of Renton Building/Planning/Public Works Department. August 1995. Reed PB 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).. Natural Resource Conservation Service. 2000. Hydric Soils List,King County Area, Washington. U. S. Department of Agriculture,Natural Resources Conservation Service, WA [11/13/20001. Downloaded from: http://www.wa.nres.usda.gov/FOTG/ SECTION2/hydric—soil—interpretations.htm. Snyder DE,Gale PS, Pringle RF. 1973. Soil Survey of King County Area,Washington. United States Department of Agriculture Soil Conservation Service,in cooperation with Washington Agricultural Experiment Station. U. S. Fish and Wildlife Service. 1995. Revised National List of Plant Species that Occur in Wetlands: Northwest (Region 9). Downloaded file (region9.txt) from National Wetlands Inventory—Ecology Section [http://www.nwi.fws.gov/Ecology.htmll. Last updated 7 August 1995. U. S. Army Corps of Engineers. 2000a. Special Public Notice. Final regional conditions,401 water quality certification conditions,coastal zone management consistency responses, rfor nationwide permits for the Seattle District Corps of Engineers for the State of Washington. U. S. Army Corps of Engineers,Seattle District,Regulatory Branch,Seattle, 1 WA. Published:June 16,2000;Effective:June 7,2000. U. S. Army Corps of Engineers. 2000b. Special Public Notice. Corps of Engineers regulatory program and the Endangered Species Act. U. S. Army Corps of Engineers,Seattle District, Regulatory Branch,Seattle,WA. Published: April 11,2000. Washington State Department of Ecology. 1997. Washington State Wetlands Identification and Delineation Manual. Publication No. 96-94. Olympia,WA. SEXEA15986AWETLANDS DELINEATION REPORT\RENTON_WETLAND_FINAL.DOC 21 1 1 1 1 1 1 1 1 1 r r � Field DataAPPENDIX Forms l y WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREETIANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT Appendix A: Field Data Forms Sample Plot ID Wetland Upland SP-01 ✓ SP-02 ✓ (Wetland B) SP-03 ✓ SP-04 ✓ SP-05 ✓ (Wetland C) SEA/E:\15986AWETLANDS DELINEATION REPORT\RENTON_WETLAND_FINALDOC A_2 WETLAND DETERMINATION SAMPLE PLOT DATA FORM CWHI LL iDATE/WEATHER: GA-lC1t? Sun1Ny , A4-D I SAMPLE PLOT NUMBER: SP- ©1 PROJECT: . ,J W I tt. S(. ST@IZ Yti1n)A-'l `t P- J. ❑WETLAND /k-Y-11- LAND PLOT(check one) LEGAL DESCRIPTION: fEC . 10 T13/� R05 E CREW: ff- LOCATION: W of W-P-f(" COUNTY:___^/G ❑Transect? or Wetland Boundary? If boundary, S feetUPSLOPE/❑DOWNSLOPE from boundary line. Do normal conditions exist?DYES/❑NO (check one). If NO,explain Has vegetation,soils,and/or hydrology been significantly disturbed? ❑YES/ NO (check one) If YES,circle which ones and explain o^lF VEGETATION SPECIES(#=dom.if>20%)STRATA*COVER STATUS SPECIES(#=dom.if>20%)STRATA* COVER STATUS - Artros�.s -1-e-V Is I H 1 80 %1 L I -1-%1- 4 V. 4 I 3- 11 0 % VU -I I V I Z0 %I Rr—U4- I ( %I I I %I (*T=tree,S=shrub,H=herb,V=vine) Percent of dominant species that are OBL,FACW,or FAC: [ 60 % Cowardin Habitat Type(s): HYDROPHYTIC VEGETATION CRITERION MET? YES ❑ NO Rationale/Comments: _f6P� t12 / N a '/. �c�r+�+ r -j S PE� /CS A,?t 'Ip l_ Fj4 �,l vFj SOILS Mapped Series: A1c(c-W u':>-( _ On hydric soil list? NO/DYES Match mapped series? ONO YES DEPTH COLOR TE) RE* MOTTLES Hydric Indicators: (check if present) (indicate depth) B- 10 10 4R 3 fz k ❑ Histosol or histic epipedon 1 pY P- 4- 4 AX ❑ Gleying ❑ Sufidic odor ❑ Aquic moisture regime (*si=silt,c=clay,s=sand,g=gravelly,m=mucky) ❑ Aq is Abundance:❑Few[<2%],❑Common[2-20%],❑Many[>20%]m r concretions Fe Fe co co matrix(=1) Size:❑Fine[<5m],❑Medium[5-15mm],❑Coarse[>15mm] ❑ Low Mottle Contrast:❑Faint,❑Dist.[1-2units],❑Prom.[>2units] ❑ Matrix Chroma(=2)&mottles 0-,NO Hydric Soil indicators observed. HYDRIC SOILS CRITERIO MET? ❑ YES NO Rationale/Comments: /�� N Y DKt 41� i.�a ci �!t S p$S'c �t� ' f� G M 1`� J'�` HYDROLOGY Depth of inundation: - Depth to saturation: — NO Hydrologic indicators. ❑ Oxidized rhizospheres ❑ Saturation in upper 12" Rationale/Comments: ❑ Watermarks on ❑ Stained leaves ❑ Driftwood ❑ Surface-scoured areas ❑ Suspended sediments ❑ Sediment deposits WETLAND HYDROLOGY CRITERION MET? ❑YES ❑ NO Rationale/Comments: AP--J(r 1)G r c- JURISDICTIONAL WETLAND DETERMINATIONRATIONALE WETLAND? ❑ YES A NO COE Manual applied(circle)• 988 r❑1989 Boundary Criteria(circle applicable): ❑Vegeta/tion, ❑soils, ❑hydrology, ❑ topography, ❑(other) break(s). Rationale/Comments: S c71 t—S 'F >�t y b 1e L (a y �-+ ►�`Y� i►4 /� /N t' . sWDATFowlDoc wOrL Af_� a WETLAND DETERMINATION SAMPLE PLOT DATA FORM 9 HlLL DATE/WEATHER: g��Cd _ vN�+'1 T SAMPLE PLOT NUMBER: SP- OZ PROJECT: �rJ )✓ �0 t - STi)�Nt �/L IRD ,'AWETLAND / ❑UPLAND PLOT(check one)- LEGAL DESCRIPTION: 5 t-T-T, 10 TZ 3 N (L D 5 E CREW: & E7h%,R i LOCATION: CON'I�� 6( St`2>6ic W t_TL.&ill) 3 eft �$S 'r Z)D) COUNTY: I.Aj ❑Transect? or Wetland Boundary? If boundary,_0 feet ❑UPSLOPE/�(DOWNSLOPE from boundary line. Do normal conditions exist? YES/❑NO (check one). If NO,explain Has vegetation,soils,and/or hydrology been significantly disturbed? ❑YES/PNO (check one) If YES,circle which ones and explain VEGETATION SPECIES(#=dom.if>20%)STRATA*COVER STATUS SPECIES(#=dom.if>20%)STRATA* COVER STATUS C cx abrJ ">� I I 8® %I ©al, �ays lacrhiadvS I V 1 /5' %I cJf 10 %I T- u t A ICI 15 %I losfi ,15 11 10 %I- f b. Pr,w y*u^ %I %I ors ivvh Vvj I1_ 1 %I cy I I %I (*T=tree, =shrub,H=herb,V=vine) ��Percent of dominant species that are OBL,FACW,or FAC: �% Cowardin Habitat Type(s): C HYDROPHYTIC VEGETATION CRITERION MET? YES ❑'NO Rationale/Comments: -*k'-rj 1�0 '/, o l- b 0'' �/}�.+i- S�f�+� �S D�� � C tn/' O2 PC jSOILS Mapped Series: A4 clA2,,WO R On hydric soil list? O/❑YES Match mapped series? NO/❑YES DEPTH COLOR TEXTU E* MOTTLES Hydric Indicators: (check if present) (indicate depth) B-rL f t'/2- 2l/ Q ❑ Histosol or histic epipedon 1� a ►� rc�yR� 2 c, s> IrayA .3 6 ❑ Gleying ❑ Sufidic odor ❑ Aquic moisture regime (*si=silt, =clay,s=sand,g=gravelly,m=mucky) ❑ Mg or Fe concretions Abundance: ew[<2%],❑Common[2-20%],❑Many[>20%] 1 El Low chroma matrix(=1) Size ine: [<5mm],❑Medium[5-15mm],❑Coarse[>15mm] Mottle Contrast:❑Faint,❑Dist.[1-2units],,]�rom.[>2units] Matrix Chroma(=2) &mottles ❑ NO Hydric Soil indicators observed. HYDRIC SOILS CRITERION MET? YES ❑ NO Rationale/Comments:_ IY��'rR t X C W-.a✓V1 4 = Z W i 1'na't 2-e HYD ROLOGY Depth of inundation: _ Depth to saturation: ❑ NO Hydrologic indicators. ❑ Oxidized rhizospheres ❑ Saturation in upper 12" Rationale/Comments: ❑ Watermarks on ❑ Stained leaves ❑ Driftwood ❑ Surface-scoured areas ❑ Suspended sediments ❑ Sediment deposits WETLAND HYDROLOGY CRITERION MET? YES ❑ NO ��� - -. Rationale/Comments: ASS�m t`D r4 `p on1 5-1+L r.�rt-_A ;, aoc s JURISDICTIONAL • RATIONALE WETLAND? YES ❑ NO COE Manual applied(circle 987 r❑1989 Boundary Criteria(circle applicable):151Vegetation,Nsoils, ❑hydrology,❑ topography,❑(other) break(s). Rationale/Comments: 3 CZ 7-Pyt 1 A Nl ES SEAIDATFORMIDOC WETLAND DETERMINATION SAMPLE PLOT DATA FORM Cff�b1 HILL DATE/WEATHER: 8�0D SAMPLE PLOT NUMBER: SP- 03 PROJECT: Nc /o-? ^ S . S-j t ju%\,.//h�12 ❑WETLAND /OUPLAND PLOT(check one) LEGAL DESCRIPTION: Sr`Zi r rJ i Z3 .-1 2.05E CREW: t c� LOCATION: 14yl cor^ S COUNTY: 11-/,J6 NTransect? or ❑Wetland Boundary? If boundary, feet❑UPSLOPE/❑DOWNSLOPE from boundary line. Do normal conditions exist? .YES/❑NO (check one). If NO,explain Has vegetation,soils, and/or hydrology been significantly disturbed? ❑YES/ KNO (check one) If YES,circle which ones and explain VEGETATION SPECIES(#= m.if>20%)STRATA* OVER STATUS SPECIES(#=dom.if>20%)STRATA* COVER STATUS i J`llrc�s 5vs I f 140 6�vj I I %I k m�M y II_�%I NL I I %I GUI rc1vS �P �' I4 1�%1 6qc i I %I ([j�S /cccib.,ja�vs IV I3_%1 hgcy+ I I %I rGX, la`1- I__ 1 4-0 %I Pc v (*T=tree,S=shrub,H=herb,V=vine) _ Percent of dominant species that are OBL,FACW,or FAC: 3 5 % Cowardin Habitat Type(s): HYDROPHYTIC VEGETATION CRITERION MET? YES ❑ NO Rationale/Comments: M o K c YN ) S O /, d 1= D&M/AJ A e j'fl A,91 D 41o&- ,-J33d S, Cn by dric soil•st? 40 i C Match mapped seri2s? ONO/ v fi i . DEPTH COLOR TEXT E* MOTTLES Hydric Indicators: (check if present) (indicate depth) ❑ Histosol or histic epipedon 10-t 3 s — ❑ Gleying ❑ Sufidic odor ❑ Aquic moisture regime (*si=silt,c=clay,s=sand,g=gravelly,m=mucky) ❑ Mg or Fe concretions Abundance: ❑Few[<2%],❑Common[2-20%],❑Many[>20%] ❑ Low Fe co matrix(=1) Size: ❑Fine[<5mm],❑Medium[5-15inm],❑Coarse[>15mm] Mottle Contrast: ❑Faint,❑Dist.[l-2units],0Prom.[>2units] ❑ Matrix Chroma (=2)&mottles �,NO Hydric Soil indicators observed. HYDRIC SOILS CRITERION MET? ❑ YES X]VO Rationale/Comments: 06 � p Pj s'J i L_ /r/ D 1 c A-ri3 2S D I rev-wo — -r G� HYDROLOGY Depth of inundation: Depth to saturation: NO Hydrologic indicators. ❑ Oxidized rhizospheres ❑ Saturation in upper 12" Rationale/Comments: ❑ Watermarks on ❑ Stained leaves ❑ Driftwood ❑ Surface-scoured areas ❑ Suspended sediments ❑ Sediment deposits WETLAND HYDROLOGY CRITERION MET? OYES XNO Rationale/Comments: NQ 14 Y D P-3 L o 1-J Dt C+¢--r'--b/L S JURISDICTIONAL • RATIONALE WETLAND? ❑ YES NO COE Manual applied(circle) 98 or 01989 Boundary Criteria(circle applicable): ❑Vegetation, ❑soils, ❑hydrology, ❑ topography, ❑(other) break(s). Rationale/Comments: s a? S -I- M&-7-, SEA/DATFORM3.Doc WETLAND DETERMINATION SAMPLE PLOT DATA FORM C.WHILL DATE/WEATHER: 6 A/0-0 SAMPLE PLOT NUMBER: SP- PROJECT: ST. ❑WETLAN_D /UPLAND PLOT(check one) LEGAL DESCRIPTION: S�-?.+r . f 0 ,Tntj, (Z 0 i:7 CREW: 'Lt,2T LOCATION: COUNTY: )Transect? or ❑Wetland Boundary? If boundary, feet ❑UPSLOPE/❑DOWNSLOPE from boundary line. Do normal conditions exist�YES/❑NO (check one). If NO,explain Has e etatio soils,and/or hydrology been significantly disturbed; ES/ ONO (check one) If YES,circle which ones and explain VE"6 t—ni'T- d At PE-}{2-S _112� S c L y VEGETATION - PECIES(#=dom.if>20%)STRATA*COVER STATUS SPECIES(#=dom.if>20%)STRATA* COVER STATUS �u c u�J C f?--le I !� I_ %I W w 1-1—%] v c ae i,44"�f I I_1Q_%I FA W i- I I %I 3 uI ,c S f�'f kt/-- I I f�pro I y-r W I I %I i-nlcas I i ads I� I %I -YIC- 1 I %1 I I %I I I %I (*T=tree,S=shrub,H=herb,V=vine) ro/o of dominant species that are OBL, FACW,or FAC: � r % Cowardin Habitat Type(s): HYDROPHYTIC VEGETATION CRITERION MET?WYES ❑ NO Rationale/Comments: M 0 A- 7r4,6,rJ 30 / , 6F D Jr+` 1/J SFEZ-/E--> AR- 0(_ Fft k) 0� . k 'ned „Pries• 1 t.,t0 o j s- — On 1-tydric soil list? - -tii0/Li Y CSS i✓Latch mapped ships? ONO j DEPTH COLOR TEX RE* MOTTLES Hydric Indicators: (check if present) (indicate depth) 0- ] O y A-,_ 1/1 4 5 ❑ Histosol or histic epipedon ❑ Gle Y�m g ❑ Sufidic odor El Aquic moisture regime (*si=silt,c=clay,s=sand,g=gravelly,m=mucky) ❑ Mg or Fe concretions Abundance:❑Few[<2%],❑Common[2-20%],❑Many[>20%] ❑ Low Fe co matrix(=1) Size:❑Fine[<5mm],❑Medium[5-15mm],❑Coarse[>15mm] Mottle Contrast:❑Faint,❑Dist.[1-2units],0Prom.[>2units] ❑ Matrix Chroma(=2)&mottles XNO Hydric Soil indicators observed. HYDRIC SOILS CRITERION MET? ❑ YES ❑ NO GW 644-- 2 8-"f- Rationale/Comments: Nv DR!C 16 ` /N 1)r 66 r 6P ✓ `Q . o M J jjf-5 HYDROLOGY Depth of inundation: Depth to saturation: NO Hydrologic indicators. ❑ Oxidized rhizospheres ❑ Saturation in upper 12" Rationale/Comments: ❑ Watermarks on ❑ Stained leaves ❑ Driftwood ❑ Surface-scoured areas ❑ Suspended sediments ❑ Sediment deposits WETLAND HYDROLOGY CRITERION MET? DYES ❑ NO Rationale/Comments: "LO l G /j D!C-A-7-2-5 d K Y2%/ev JURISDICTIONAL • RATIONALE WETLAND? ❑ YES PNO COE Manual applied(circle : 1987 r❑1989 Boundary Criteria(circle applicable): ❑Vegetation, ❑soils, Qhydrology, ❑ topography, ❑(other) break(s). rj Rationale/Comments: S d!L S + A,l b?-3 L-y(1 C tL i'TtYL A N 1 T' M CT-, SEVDATFORW.DOc WETLAND DETERMINATION SAMPLE PLOT DATA FORM CKWILL DATE/WEATHER: SAMPLE PLOT NUMBER: SP- OE PROJECT: �v/J NE_ 1 d 57. 5-10a0 v✓q-rI1- YfWETLAND / ❑UPLAN PLOT(check one) LEGAL DESCRIPTION: SST LEGAL TZ3 A/ a�E CREW: f{ F_ L�-'R i T W f!1 71 LOCATION: s r/ !J o Tl f u/E�j c��� /..� D,2,�,,.�/9 Ut COUNTY: /A/G ❑Transect? or Welland Boundary? If boundary, feet ❑UPSLOPE/P�OWNSLOPE from boundary line. Do normal conditions exist?MES/❑NO (check one). If NO,explain Has e etati soils and/o h dr�gy �nsignificaMly disturbed? YES/ ONO (check one) If YES,ci ewhic ones and exp � l c( 1 L( r re 5 1 ate c1'�Cd.Q l r s VEGETATION SPECIES(#=dom.if>20%)STRATA*COVER S TUS SPECIES(#=dom.if>20%)STRATA* COVER STATUS �1 vv,c 0< v I- H 1 10 %I � b✓ I V 1 S %I cU IT}�I /°I �cL,/ �ti l`�sL l�/ I�—I T %I Nt- - d ✓ 1 ✓S �7RQS� I T -t $ 1 20 %I r;q-L S 14 1 T' %IJ y✓ r✓I ra IT 1 2-0 %ice (* =tree,S=shrub,H=herb,V=vine) Percent of dominant species that are OBL,FACW,or FAC: 0 d % CJowardin Habitat Type(s): �� G HYDROPHYTIC VEGETATION CRITERION MET?per{YES ❑ NO Yv✓r -p, �, ` � Rationale/Comments: P J R-r ,h-rh l Sd 1 OF d M 1,-jMT ' J + l 0bL q Ff+cyj v2 R-C , SOILS Mapped Series: Ac wood On hydric soil list?'UNO/❑YES Match mapped series? ❑NO/❑YES DEPTH COLOR TEXT RE* MOTTLES Hydric Indicators: (check if present) (indicate depth) 0- /yH R ¢Zi 3 + � aQ i ❑ Histosol or histic epipedon � /vs , � -fill ❑ Gleying ❑ Sufidic odor ❑ Aquic moisture regime (*si=silt,c=clay,s=sand,g=gravelly,m=mucky) ❑ Mg or Fe concretions Abundance:❑Few[<2%],❑Common[2-20%],❑Many[>20%] Size:❑Fine[<5mm],❑Medium[5-15mm],❑Coarse[>15m ❑ Low chroma matrix(=1)m] ❑ Matrix Chroma(=2)&mottles Mottle Contrast:❑Faint,❑Dist.[1-2units],❑Prom.[>2units] ❑ NO Hydric Soil indicators observed. ' HYDRIC SOILS CRITERION MET?KYES ❑NO Rationale/Comments: ASS M E �l ?SASQ on! 14yPR-Ot /%YP HYD ROLOGY Depth of inundation:_N3-1- o b V-Pd Depth to saturation: ahS-e v" ❑ NO Hydrologic indicators. ❑ Oxidized rhizospheres ❑ Saturation in upper 12" Rationale/Comments: Water marks on +rV S ❑ Stained leaves Drift wood �g Surface-scoured areas ❑ Suspended sediments ❑ di Sediment deposits � 8� gy�- p— , � � s 0 � )—C-p-❑ O 4 WETLAND HYDROLOGY CRITERION MET?gYES Rationale/Comments: JURISDICTIONAL • RATIONALE WETLAND? YES ❑ NO COE Manual applied(circl ) 987 r❑1989 Boundary Criteria(circle applicable):/mYegetation, ❑soils,Mydrology, topography, ❑(other) break(s). Rationale/Comments: AL-L 3 C Ai �� �} /►7 SEA/DATFORMIDoc i 1 1 1 1 APPENDIX B � U. S. Corps of Engineers Nationwide Permit 43 1 1 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE LOTH STREET/ANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT Appendix B: U. S. Corps of Engineers Nationwide Permit 43 (Adapted from U. S. Army Corps of Engineers, 2000a) 43. Stormwater Management Facilities. Discharges of dredged or fill material into nontidal waters of the United States,excluding nontidal wetlands adjacent to tidal waters, for the construction and maintenance of stormwater management facilities,including activities for the excavation of stormwater ponds/facilities,detention basins,and retention basins;the installation and maintenance of water control structures,outfall structures and emergency spillways;and the maintenance dredging of existing stormwater management ' ponds/facilities and detention and retention basins,provided the activity meets all of the following criteria: a. The discharge for the construction of new stormwater management facilities does not cause the loss of greater than one-half acre of nontidal waters of the United States, excluding nontidal wetlands adjacent to tidal waters; b. The discharge does not cause the loss of greater than 300 linear feet of stream bed; c. The discharge of dredged or fill material for the construction of new stormwater ' management facilities in perennial streams is not authorized; d. For discharges or excavation for the construction of new stormwater management facilities or for the maintenance of existing stormwater management facilities causing the loss of greater than one-tenth acre of nontidal waters,excluding nontidal wetlands adjacent to tidal waters, the permittee notifies the District Engineer in accordance with General Condition 13. In addition, the notification must include: (1) A maintenance plan. The maintenance plan should be in accordance with State and local requirements,if any such requirements exist; (2) For discharges in special aquatic sites,including wetlands and submerged aquatic vegetation,the notification must include a delineation of affected areas;and (3) A compensatory mitigation proposal that offsets the loss of waters of the United States. Maintenance in constructed areas will not require mitigation provided such maintenance is accomplished in designated maintenance areas and not within compensatory mitigation areas (i.e.,district engineers may designate nonmaintenance areas,normally at the downstream end of the stormwater management facility,in existing stormwater management facilities). (No mitigation will be required for activities which are exempt from Section 404 permit requirements); e. The permittee must avoid and minimize discharges into waters of the United States at the project site to the maximum extent practicable,and the notification must include a written statement to the District Engineer detailing compliance with this condition (i.e., why the discharge must occur in waters of the United States and why additional minimization cannot be achieved); ' SEA/EAI5986AWETLANDS DELINEATION REPORT\RENTON_WETLAND-FINAL.DOC g_Z WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE LOTH STREETIANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT ' f. The stormwater management facility must comply with General Condition 21 and be designed using best management practices (BMPs) and watershed protection techniques. Examples may include forebays (deeper areas at the upstream end of the stormwater management facility that would be maintained through excavation), vegetated buffers,and siting considerations to minimize adverse effects to aquatic resources. Another example of a BMP would be bioengineering methods incorporated into the facility design to benefit water quality and minimize adverse effects to aquatic resources from storm flows,especially downstream of the facility, that provide,to the maximum extent practicable,for long term aquatic resource protection and enhancement; g. Maintenance excavation will be in accordance with an approved maintenance plan and will not exceed the original contours of the facility as approved and constructed;and h. The discharge is part of a single and complete project. (Section 404) Notification Requirement.Yes. Notification required for impacts greater than 1/10 th of an acre,work proposed in intermittent or ephemeral streams, and permanent above-grade fills above the headwaters and within the flood fringe of the 100-year floodplain. See Regional conditions below and National General Conditions 13—Notification and 26(b)(1)—Fills ' Within 100-Year Floodplains,for specific requirements. NOTE.Also review information in Migratory Bird section above (page 21). Regional Conditions 1. In addition to being restricted from use in tidal waters of the United States (defined in 33 CFR Part 328.4(b)), this NWP is not authorized for use in the nontidal waters of the United States listed below. An individual permit application must be submitted for any proposed work in these designated areas: a) Wetlands adjacent to lower perennial riverine systems (see Note below); or b) Coastal dunal wetland systems along the coast of Washington except for within the city of Long Beach provided the project is consistent with the approved "City of Long Beach Dune Management Report";or c) Lakes,playa lakes,prairie potholes,vernal pools,kettles, and camas prairie wetlands or within 100 feet of any such system;or d) "Protected High-Functioning Wetlands as identified in the Skagit WIN Phase III: Wetland Management Plan for the Port of Skagit County dated 1 August 1997. NOTE:Adjacent is as defined in 33 CFR Part 328.3(c). In the riverine systems,a line is drawn perpendicular to the river at the break between lower and upper perennial river systems. This NWP can be used in those wetlands upstream of this line only. These systems are defined in the Appendix of the Public Notice. 2. The permittee must notify the District Engineer in accordance with the General Condition 13 for any proposed work located in intermittent or ephemeral streams. 1 SEAIE:\159867\WETLANDS DELINEATION REPORi\RENTON_WETLAND_FINALDOC g-3 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREET/ANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT NOTE.Compensatory will be allowed within the stormwater management P rY g facility when: (1) the hydrology is persistent and permanently vegetated wetlands will develop,i.e. the hydrology is not flashy;and (2)sinuous edges,islands,vegetation class and open water interspersion are incorporated into the design;and (3)water quality treatment is incorporated outside of the compensatory mitigation area.EPA, State, Puyallup Tribe, and Chehalis Tribe 401 Certification-Denied without prejudice. An individual 401 Certification is required for all Section 404 activities. CZM Consistency Response-Denied without prejudice. An individual CZM Consistency Response must be obtained from the State for projects located in counties within the coastal zone. Consistency with CZM cannot be determined until any necessary consultation required under ESA is completed. The State's CZM review will start upon completion of ESA requirements. SEA/EA159667\WETLANDS DELINEATION REPORT\RENTON_WETLAND_FINALDOC g_q r _ 1 r r r r r r r r r APPENDIX C Photographs ' WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREET/ANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT PHOTO Looking north at Sample Plot SP-02 in Wetland B. x-�t kv ry t { J� r r S i PHOTO 2 Looking west at Wetland B. Note bentgrass and soft rush in foreground. - + 7 s1f a SEA\EM 5986AWETLANDS DELINEATION REPORT\RENTON_WETLAND_APPENDIX C_FINAL.DOC C-2 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREET/ANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT PHOTO 3 In northwestern property comer looking north at SP-03. � Yy �i r lf4 a PHOTO 4 Looking south at SP-04. Fence at right is the western boundary of the Vuong property. 4. r �~ I SEA\E:\15986AWETLANDS DELINEATION REPORT\RENTON_WETLAND_APPENDIX C_FINAL.DOC C-3 WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE 10TH STREET/ANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT PHOTO 5 Looking at wetland C extending northward off site from the northeast comer of the Vuong property. Notice debris and ' ground is bare from flowing and/or standing water during the early growing season. �r ' SEA\EA159867\WETLANDS DELINEATION REPO RT\RENTON_WETLAND_APPENDIX C_FINAL.DOC C-4 ' WETLAND DELINEATION AND CLASSIFICATION REPORT FOR THE NE LOTH STREETIANACORTES AVENUE NE STORMWATER SYSTEM IMPROVEMENT PROJECT PHOTO 6 Ariel view of property -• N r sue'` 's ' SEA\E:\15986TWETLANDS DELINEATION REPOR-RRENTON_WETLAND_APPENDIX C_FINAL.DOC -� C m