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HomeMy WebLinkAboutRS_Critical Areas Study_Altmann Oliver Assoc_191025_V2 October 25, 2019 AOA-4902 Tom Dalpay 29709 – 174th Avenue SE Kent, WA 98042 tdalpay@comcast.net SUBJECT: Critical Areas Study for Dalpay Short Plat (Revised) Parcel 032305-9120, City of Renton, WA LUA19-000136, SHPL-A, ECF, MOD Dear Tom: This critical areas study has been updated to reflect the comments presented in the August 16, 2019 request for information letter from the City of Renton. 1.0 INTRODUCTION This report is the result of a wetland reconnaissance and stream study on a 2.46-acre site located in the City of Renton, Washington. As part of the current project, the site would be subdivided into five lots. Although no wetlands or streams were identified on the site, one stream (Greenes Creek) was observed off-site to the west and one wetland (Wetland A) was identified off-site to the northwest. 2.0 METHODOLOGY On May 7, 2015 I conducted an initial wetland and stream reconnaissance utilizing the methodology outlined in the May 2010 Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region (Version 2.0). No wetlands were identified on the site during this reconnaissance or during a subsequent site review on October 11, 2016. On March 29, 2018 I conducted an updated site review to confirm the lack of wetlands on the property. During this site visit the ordinary high water (OHW) of the east side of Greenes Creek was delineated and subsequently surveyed (Figure 1). Tom Dalpay October 25, 2019 Page 2 On August 22, 2019 I conducted a site review in the vicinity of a wetland previously identified in the northern portion of the critical area tract associated with the Windstone Division 5 Plat. The area previously mapped as wetland consisted entirely of monotypic Himalayan blackberry (Rubus armeniacus) with non-hydric soils that were very dry at the time of the site visit (see Data Plot 1 in Attachment A). This area does not currently meet the criteria for a wetland. However, during the August 2019 review a wetland (Wetland A) was observed further downstream and off-site to the northwest. The portion of the wetland closest to the subject property was delineated and subsequently surveyed. 3.0 GENERAL PROPERTY DESCRIPTION AND LAND USE The site consists of tax parcel 032305-9120 located at the NW corner of NE Sunset Boulevard and Nile Avenue NE in the City of Renton, Washington. It is found within the SE ¼ of the SE ¼ of Section 3, Township 23 North, Range 5 East, W.M. The site is currently undeveloped and consists of a periodically mowed upland old pasture. Vegetation on the site was dominated by grasses, patches of Himalayan blackberry (Rubus armeniacus), and weeds such as Canada thistle (Cirsium arvense). In addition, a clump of bitter cherry (Prunus emarginata) saplings was observed in the northeast corner of the site. 4.0 RESULTS Greenes Creek is located entirely off-site to the west and drains from south to north through a Critical Area Tract associated with the Windstone Division 5 property. At the time of the March 29, 2018 delineation the channel width averaged approximately 1-foot wide and was somewhat undefined in places. Much of the channel was dry and only a slight flow was observed along segments of the channel. No wetlands were identified adjacent the stream within the Windstone Division 5 Plat, but one wetland (Wetland A) was delineated adjacent the stream off-site to the northwest within Tract 802977TR-B. Since the stream only conveys intermittent or highly seasonal flows and does not contain fish habitat it is considered a Type Ns stream by the City of Renton. Type Ns streams in the City of Renton require a 50-foot buffer and additional 15-foot building setback from the ordinary high water of the stream per RMC 4-3-050.G.2. The riparian corridor of Greenes Creek in the vicinity of the site consisted primarily of dense Himalayan blackberry with widely scattered black cottonwood (Populus trichocarpa), big-leaf maple (Acer macrophyllum), and Douglas fir (Pseudotsuga menziesii) trees. Wetland A appears to have been heavily disturbed through historic grading. Since the Greenes Creek channel was not well-defined through the wetland, Wetland A was considered a shallow Depressional Hydrogeomorphic (HGM) wetland for rating purposes. Tom Dalpay October 25, 2019 Page 3 Wetland A consisted of a scrub-shrub plant community dominated almost entirely by Sitka willow (Salix sitchensis), with small amounts of Himalayan blackberry and creeping buttercup (Ranunculus repens). The wetland was dry at the time of the delineation, but likely has some occasional shallow ponding. Wetland A meets the criteria for a Category III wetland with 4 Habitat Points and requires a standard 75-foot buffer and 15-foot structure setback adjacent non-low impact land uses per RMC 4-3-050.G.2. 5.0 STREAM/WETLAND FUNCTIONS AND VALUES Riparian corridors and wetlands provide many valuable ecological and social functions, including water quality protection and wildlife habitat. Although historically disturbed, the riparian corridor and off-site Wetland A do continue to provide some of these functions. The critical areas serve to trap sediments and other pollutants, thereby helping maintain water quality in downstream areas. In addition to the hydrologic functions, the riparian corridor and wetland also provide biological functions, including habitat for a variety of wildlife species typically found in suburban environments. Another biologic function of the critical areas is the transport of nutrients (via Greenes Creek) to downstream areas. Nutrients transported to downstream areas provide biological support for fish and other aquatic wildlife. Although privately owned, the critical areas do provide some limited cultural functions as part of the overall open space associated with the site and adjacent critical area tracts. The riparian corridor also contains some minor passive recreational opportunities such as wildlife viewing. 6.0 HABITAT ASSESSMENT As part of the critical areas study, the WA Department of Fish and Wildlife’s Priority Habitats and Species (PHS) database was reviewed. This database did not indicate the presence of any threatened, endangered, sensitive, monitored, or priority habitats or species on or adjacent to the property. While the site does likely provide habitat for a variety of birds, small mammals, reptiles, and amphibians typically found within suburban environments, no threatened, endangered, sensitive, monitored, or priority species were identified on or adjacent the site during the field investigations and no critical habitat was observed. Tom Dalpay October 25, 2019 Page 4 As defined in RMC 4-11-030.C, Critical Habitat is an area associated with threatened, endangered, sensitive, monitored, or priority species of plants or wildlife and which, if altered, could reduce the likelihood that the species would maintain and reproduce over the long term. Since no critical habitat has been identified on the site, no Habitat Data Report is required. 7.0 PROPOSED PROJECT As part of the proposed 5-lot short-plat, the on-site portion of the Greenes Creek and Wetland A buffers would be entirely preserved within a Critical Area Tract. It is my understanding that a rail fence with appropriate signage would be installed along the tract boundary and that no work is proposed within the buffers. If you have any questions, please give me a call. Sincerely, ALTMANN OLIVER ASSOCIATES, LLC John Altmann Ecologist Attachments Pictometry, King County, King County Date: 5/20/2019 Notes: ±The information included on this map has been compiled by King County staff from a variety of sources and issubject to change without notice. King County makes no representations or warranties, express or implied,as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intendedfor use as a survey product. King County shall not be liable for any general, special, indirect, incidental, orconsequential damages including, but not limited to, lost revenues or lost profits resulting from the use or misuseof the information contained on this map. Any sale of this map or information on this map is prohibited except bywritten permission of King County. Parcel 032305-9120 SDSDSDSDSDSD GGGGGGGGGGGGGGGGGGGGGGGGGG EEEEEEEEEEEEEEEEEETTTTTTTTTTTTTTTTTTTTTTTTTTTTTTSS SS SS SS SS SS SS SS SS SSSS SS SS SSX XXXXXXXXXXXXXXXXXXXXXWWWWWSS SS SS SS GGGGGGWWGGGGGG G GSSTTSSPROJECTDRAWNDATESCALEREVISEDLandscapeArchitectureAOAEnvironmentalPlanning &Office (425) 333-4535PO Box 578Carnation, WA 98014Fax (425) 333-4509Altmann Oliver Associates, LLC4902-MIT-10-25-19.dwg SDSDSDSDSDSD GGGGGGGGGGGGGGGGGGGGGGGGGG EEEEEEEEEEEEEEEEEETTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTSS SS SS SS SS SS SS SS SS SS S S SS SS SSX XXXXXXXXXXXXXXXXXXXXXWWWWWSS SS SS SS GGGGGWWGGGGGG G GSSTTSS54231TRACT B (STORM DETENTION)TRACT A (CRITICAL AREA)10348 SF9534 SF13459 SF10918 SF13160 SF7354 SF15537 SFPROJECTDRAWNDATESCALEREVISEDLandscapeArchitectureAOAEnvironmentalPlanning &Office (425) 333-4535PO Box 578Carnation, WA 98014Fax (425) 333-4509Altmann Oliver Associates, LLC4902-MIT-10-25-19.dwg US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0 WETLAND DETERMINATION DATA FORM – Western Mountains, Valleys, and Coast Region VEGETATION – Use scientific names of plants Tree Stratum (Plot size: 10) Absolute % Cover Dominant Species? Indicator Status Dominance Test Worksheet: 1. Number of Dominant Species That Are OBL, FACW, or FAC: 1 (A) 2. 3. Total Number of Dominant Species Across All Strata: 1 (B) 4. 50% = , 20% = = Total Cover Percent of Dominant Species That Are OBL, FACW, or FAC: 100 (A/B) Sapling/Shrub Stratum (Plot size: 10) 1. Rubus armeniacus 100 yes FAC Prevalence Index worksheet: 2. Total % Cover of: Multiply by: 3. OBL species x1 = 4. FACW species x2 = 5. FAC species x3 = 50% = 50, 20% = 20 100 = Total Cover FACU species x4 = Herb Stratum (Plot size: 10) UPL species x5 = 1. Column Totals: (A) (B) 2. Prevalence Index = B/A = 3. Hydrophytic Vegetation Indicators: 4. 1 – Rapid Test for Hydrophytic Vegetation 5. 2 - Dominance Test is >50% 6. 3 - Prevalence Index is <3.01 7. 4 - Morphological Adaptations1 (Provide supporting data in Remarks or on a separate sheet) 8. 9. 5 - Wetland Non-Vascular Plants1 10. Problematic Hydrophytic Vegetation1 (Explain) 11. 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic. 50% = , 20% = = Total Cover Woody Vine Stratum (Plot size: ) 1. Hydrophytic Vegetation Present? Yes No 2. 50% = , 20% = = Total Cover % Bare Ground in Herb Stratum Remarks: Project Site: Parcel: 032305-9120 City/County: Renton/King County Sampling Date: 8-22-19 Applicant/Owner: Dalpay State: WA Sampling Point: DP#1 Investigator(s): John Altmann Section, Township, Range: S3, T23N, R5E Landform (hillslope, terrace, etc.): Gentle Slope Local relief (concave, convex, none): concave Slope (%): Subregion (LRR): A Lat: 47.50644 Long: -122.14513 Datum: Soil Map Unit Name: AgC NWI classification: Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.) Are Vegetation , Soil , or Hydrology , significantly disturbed? Are “Normal Circumstances” present? Yes No Are Vegetation , Soil , or Hydrology , naturally problematic? (If needed, explain any answers in Remarks.) SUMMARY OF FINDINGS – Attach site map showing sampling point locations, transects, important features, etc. Hydrophytic Vegetation Present? Yes No Is the Sampled Area within a Wetland? Yes No Hydric Soil Present? Yes No Wetland Hydrology Present? Yes No Remarks: Located within center of wetland as mapped in Windstone Division 5 US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0 SOIL Sampling Point: DP#1 Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.) Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type1 Loc2 Texture Remarks 0-10 10 YR 3/2 100 GSL gravelly sandy loam 11-16 10 YR 3/3 100 GSL 1Type: C= Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. 2Location: PL=Pore Lining, M=Matrix Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.) Indicators for Problematic Hydric Soils3: Histosol (A1) Sandy Redox (S5) 2 cm Muck (A10) Histic Epipedon (A2) Stripped Matrix (S6) Red Parent Material (TF2) Black Histic (A3) Loamy Mucky Mineral (F1) (except MLRA 1) Very Shallow Dark Surface (TF12) Hydrogen Sulfide (A4) Loamy Gleyed Matrix (F2) Other (Explain in Remarks) Depleted Below Dark Surface (A11) Depleted Matrix (F3) 3Indicators of hydrophytic vegetation and wetland hydrology must be present, unless disturbed or problematic. Thick Dark Surface (A12) Redox Dark Surface (F6) Sandy Mucky Mineral (S1) Depleted Dark Surface (F7) Sandy Gleyed Matrix (S4) Redox Depressions (F8) Restrictive Layer (if present): Hydric Soils Present? Yes No Type: Depth (inches): Remarks: No redoximorphic features observed. HYDROLOGY Wetland Hydrology Indicators: Primary Indicators (minimum of one required; check all that apply) Secondary Indicators (2 or more required) Surface Water (A1) Water-Stained Leaves (B9) Water-Stained Leaves (B9) High Water Table (A2) (except MLRA 1, 2, 4A, and 4B) (MLRA 1, 2, 4A, and 4B) Saturation (A3) Salt Crust (B11) Drainage Patterns (B10) Water Marks (B1) Aquatic Invertebrates (B13) Dry-Season Water Table (C2) Sediment Deposits (B2) Hydrogen Sulfide Odor (C1) Saturation Visible on Aerial Imagery (C9) Drift Deposits (B3) Oxidized Rhizospheres along Living Roots (C3) Geomorphic Position (D2) Algal Mat or Crust (B4) Presence of Reduced Iron (C4) Shallow Aquitard (D3) Iron Deposits (B5) Recent Iron Reduction in Tilled Soils (C6) FAC-Neutral Test (D5) Surface Soil Cracks (B6) Stunted or Stresses Plants (D1) (LRR A) Raised Ant Mounds (D6) (LRR A) Inundation Visible on Aerial Imagery (B7) Other (Explain in Remarks) Frost-Heave Hummocks (D7) Sparsely Vegetated Concave Surface (B8) Field Observations: Surface Water Present? Yes No Depth (inches): Wetland Hydrology Present? Yes No Water Table Present? Yes No Depth (inches): Saturation Present? (includes capillary fringe) Yes No Depth (inches): Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: Dry with no evidence of hydrology over multiple site visits. Project Site: Parcel: 032305-9120 ATTACHMENT B WETLAND RATING Wetland name or number A Name of wetland (or ID #):Date of site visit:8/22/2019 Rated by Trained by Ecology? Yes No Date of training 03/08 & 03/15 HGM Class used for rating Wetland has multiple HGM classes? Yes No NOTE: Form is not complete with out the figures requested (figures can be combined). Source of base aerial photo/map OVERALL WETLAND CATEGORY III (based on functions or special characteristics ) 1. Category of wetland based on FUNCTIONS Category I - Total score = 23 - 27 Score for each Category II - Total score = 20 - 22 function based X Category III - Total score = 16 - 19 on three Category IV - Total score = 9 - 15 ratings (order of ratings is not important) L L 9 = H, H, H H L 8 = H, H, M M M Total 7 = H, H, L 7 = H, M, M 6 = H, M, L 6 = M, M, M 5 = H, L, L 5 = M, M, L 4 = M, L, L 3 = L, L, L 2. Category based on SPECIAL CHARACTERISTICS of wetland X Depressional & Flats RATING SUMMARY – Western Washington List appropriate rating (H, M, L) HydrologicImproving Water Quality MSite Potential Landscape Potential Habitat M FUNCTION Dalpay Short Plat Altmann King County iMAP Coastal Lagoon Interdunal Value Score Based on Ratings 7 6 4 17 H CHARACTERISTIC Category Estuarine Wetland of High Conservation Value Bog Mature Forest Old Growth Forest None of the above Wetland Rating System for Western WA: 2014 UpdateRating Form - Effective January 1, 2015 1 WSDOT Adapted Form - March 2, 2015 Wetland name or number A D 1.1. Characteristics of surface water outflows from the wetland: points = 3 points = 2 points = 1 points = 1 Yes = 4 No = 0 Wetland has persistent, ungrazed, plants > 95% of area points = 5 Wetland has persistent, ungrazed, plants > ½ of area points = 3 Wetland has persistent, ungrazed plants > 1/10 of area points = 1 Wetland has persistent, ungrazed plants < 1/10 of area points = 0 D 1.4. Characteristics of seasonal ponding or inundation: This is the area that is ponded for at least 2 months. See description in manual. Area seasonally ponded is > ½ total area of wetland points = 4 Area seasonally ponded is > ¼ total area of wetland points = 2 Area seasonally ponded is < ¼ total area of wetland points = 0 Total for D 1 Add the points in the boxes above 7 Rating of Site Potential If score is: 12 - 16 = H 6 - 11 = M 0 - 5 = L Record the rating on the first page D 2.1. Does the wetland unit receive stormwater discharges?Yes = 1 No = 0 1 Yes = 1 No = 0 D 2.3. Are there septic systems within 250 ft of the wetland?Yes = 1 No = 0 0 Source Yes = 1 No = 0 Total for D 2 Add the points in the boxes above 2 Rating of Landscape Potential If score is: 3 or 4 = H 1 or 2 = M 0 = L Record the rating on the first page Yes = 1 No = 0 Yes = 1 No = 0 Yes = 2 No = 0 Total for D 3 Add the points in the boxes above 2 Rating of Value If score is: 2 - 4 = H 1 = M 0 = L Record the rating on the first page 1 0 Water Quality Functions - Indicators that the site functions to improve water quality D 1.0. Does the site have the potential to improve water quality? 2 Wetland has an unconstricted, or slightly constricted, surface outlet that is permanently flowing Wetland has an intermittently flowing stream or ditch, OR highly constricted permanently flowing outlet. Wetland is a depression or flat depression (QUESTION 7 on key) with no surface water leaving it (no outlet). Wetland is a flat depression (QUESTION 7 on key), whose outlet is a permanently flowing ditch. 0 D 2.0. Does the landscape have the potential to support the water quality function of the site? DEPRESSIONAL AND FLATS WETLANDS D 3.3. Has the site been identified in a watershed or local plan as important for maintaining water quality (answer YES if there is a TMDL for the basin in which the unit is found)? D 1.2. The soil 2 in below the surface (or duff layer) is true clay or true organic (use NRCS definitions ). D 1.3. Characteristics and distribution of persistent plants (Emergent, Scrub-shrub, and/or Forested Cowardin classes): D 2.4. Are there other sources of pollutants coming into the wetland that are not listed in questions D 2.1 - D 2.3? D 3.1. Does the wetland discharge directly (i.e., within 1 mi) to a stream, river, lake, or marine water that is on the 303(d) list? D 2.2. Is > 10% of the area within 150 ft of the wetland in land uses that generate pollutants? D 3.2. Is the wetland in a basin or sub-basin where an aquatic resource is on the 303(d) list? D 3.0. Is the water quality improvement provided by the site valuable to society? 1 1 0 0 5 Wetland Rating System for Western WA: 2014 UpdateRating Form - Effective January 1, 2015 5 WSDOT Adapted Form - March 2, 2015 Wetland name or number A D 4.1. Characteristics of surface water outflows from the wetland: points = 4 points = 2 points = 1 points = 0 Marks of ponding are 3 ft or more above the surface or bottom of outlet points = 7 Marks of ponding between 2 ft to < 3 ft from surface or bottom of outlet points = 5 Marks are at least 0.5 ft to < 2 ft from surface or bottom of outlet points = 3 The wetland is a “headwater” wetland points = 3 Wetland is flat but has small depressions on the surface that trap water points = 1 Marks of ponding less than 0.5 ft (6 in)points = 0 The area of the basin is less than 10 times the area of the unit points = 5 The area of the basin is 10 to 100 times the area of the unit points = 3 The area of the basin is more than 100 times the area of the unit points = 0 Entire wetland is in the Flats class points = 5 Total for D 4 Add the points in the boxes above 2 Rating of Site Potential If score is: 12 - 16 = H 6 - 11 = M 0 - 5 = L Record the rating on the first page D 5.1. Does the wetland unit receive stormwater discharges?Yes = 1 No = 0 1 D 5.2. Is > 10% of the area within 150 ft of the wetland in land uses that generate excess runoff? Yes = 1 No = 0 Yes = 1 No = 0 Total for D 5 Add the points in the boxes above 3 Rating of Landscape Potential If score is: 3 = H 1 or 2 = M 0 = L Record the rating on the first page points = 2 points = 1 Flooding from groundwater is an issue in the sub-basin.points = 1 points = 0 There are no problems with flooding downstream of the wetland.points = 0 Yes = 2 No = 0 Total for D 6 Add the points in the boxes above 1 Rating of Value If score is: 2 - 4 = H 1 = M 0 = L Record the rating on the first page DEPRESSIONAL AND FLATS WETLANDS D 6.0. Are the hydrologic functions provided by the site valuable to society? The wetland captures surface water that would otherwise flow down-gradient into areas where flooding has damaged human or natural resources (e.g., houses or salmon redds): Flooding occurs in a sub-basin that is immediately down- gradient of unit. Surface flooding problems are in a sub-basin farther down- gradient. Hydrologic Functions - Indicators that the site functions to reduce flooding and stream degradation D 4.0. Does the site have the potential to reduce flooding and erosion? 2 Wetland is a depression or flat depression with no surface water leaving it (no outlet) Wetland has an unconstricted, or slightly constricted, surface outlet that is permanently flowing Wetland has an intermittently flowing stream or ditch, OR highly constricted permanently flowing outlet Wetland is a flat depression (QUESTION 7 on key), whose outlet is a permanently flowing ditch 0 D 5.0. Does the landscape have the potential to support hydrologic function of the site? 1 1 D 5.3. Is more than 25% of the contributing basin of the wetland covered with intensive human land uses (residential at >1 residence/ac, urban, commercial, agriculture, etc.)? The existing or potential outflow from the wetland is so constrained by human or natural conditions that the water stored by the wetland cannot reach areas that flood. Explain why 1 0 0 D 4.2. Depth of storage during wet periods: Estimate the height of ponding above the bottom of the outlet. For wetlands with no outlet, measure from the surface of permanent water or if dry, the deepest part. D 4.3. Contribution of the wetland to storage in the watershed: Estimate the ratio of the area of upstream basin contributing surface water to the wetland to the area of the wetland unit itself. D 6.1. The unit is in a landscape that has flooding problems. Choose the description that best matches conditions around the wetland unit being rated. Do not add points. Choose the highest score if more than one condition is met. D 6.2. Has the site been identified as important for flood storage or flood conveyance in a regional flood control plan? Wetland Rating System for Western WA: 2014 UpdateRating Form - Effective January 1, 2015 6 WSDOT Adapted Form - March 2, 2015 Wetland name or number A HABITAT FUNCTIONS - Indicators that site functions to provide important habitat H 1.0. Does the site have the potential to provide habitat? Aquatic bed 4 structures or more: points = 4 Emergent 3 structures: points = 2 Scrub-shrub (areas where shrubs have > 30% cover)2 structures: points - 1 Forested (areas where trees have > 30% cover)1 structure: points = 0 If the unit has a Forested class, check if : H 1.2. Hydroperiods Permanently flooded or inundated 4 or more types present: points = 3 Seasonally flooded or inundated 3 types present: points = 2 Occasionally flooded or inundated 2 types present: points = 1 Saturated only 1 types present: points = 0 Permanently flowing stream or river in, or adjacent to, the wetland Seasonally flowing stream in, or adjacent to, the wetland Lake Fringe wetland 2 points Freshwater tidal wetland 2 points H 1.3. Richness of plant species If you counted:> 19 species points = 2 5 - 19 species points = 1 < 5 species points = 0 H 1.4. Interspersion of habitats These questions apply to wetlands of all HGM classes. The Forested class has 3 out of 5 strata (canopy, sub-canopy, shrubs, herbaceous, moss/ground-cover) that each cover 20% within the Forested polygon 0 H 1.1. Structure of plant community: Indicators are Cowardin classes and strata within the Forested class. Check the Cowardin plant classes in the wetland. Up to 10 patches may be combined for each class to meet the threshold of ¼ ac or more than 10% of the unit if it is smaller than 2.5 ac. Add the number of structures checked. None = 0 points Low = 1 point Moderate = 2 points All three diagrams in this row are HIGH = 3 points 0 Check the types of water regimes (hydroperiods) present within the wetland. The water regime has to cover more than 10% of the wetland or ¼ ac to count (see text for descriptions of hydroperiods ). 1 Count the number of plant species in the wetland that cover at least 10 ft2.Different patches of the same species can be combined to meet the size threshold and you do not have to name the species. Do not include Eurasian milfoil, reed canarygrass, purple loosestrife, Canadian thistle 0 Decide from the diagrams below whether interspersion among Cowardin plants classes (described in H 1.1), or the classes and unvegetated areas (can include open water or mudflats) is high, moderate, low, or none. If you have four or more plant classes or three classes and open water, the rating is always high. Wetland Rating System for Western WA: 2014 UpdateRating Form - Effective January 1, 2015 7 WSDOT Adapted Form - March 2, 2015 Wetland name or number AH 1.5. Special habitat features: Large, downed, woody debris within the wetland (> 4 in diameter and 6 ft long) Standing snags (dbh > 4 in) within the wetland Total for H 1 Add the points in the boxes above 2 Rating of Site Potential If Score is: 15 - 18 = H 7 - 14 = M 0 - 6 = L Record the rating on the first page H 2.0. Does the landscape have the potential to support the habitat function of the site? H 2.1 Accessible habitat (include only habitat that directly abuts wetland unit). Calculate: 0 % undisturbed habitat + (0.2 % moderate & low intensity land uses / 2 ) = 0.1% If total accessible habitat is: > 1/3 (33.3%) of 1 km Polygon points = 3 20 - 33% of 1 km Polygon points = 2 10 - 19% of 1 km Polygon points = 1 < 10 % of 1 km Polygon points = 0 H 2.2. Undisturbed habitat in 1 km Polygon around the wetland. Calculate: 21.3 % undisturbed habitat + (4.3 % moderate & low intensity land uses / 2 ) = 23.45% Undisturbed habitat > 50% of Polygon points = 3 Undisturbed habitat 10 - 50% and in 1-3 patches points = 2 Undisturbed habitat 10 - 50% and > 3 patches points = 1 Undisturbed habitat < 10% of 1 km Polygon points = 0 H 2.3 Land use intensity in 1 km Polygon: If > 50% of 1 km Polygon is high intensity land use points = (-2) ≤ 50% of 1km Polygon is high intensity points = 0 Total for H 2 Add the points in the boxes above -1 Rating of Landscape Potential If Score is: 4 - 6 = H 1 - 3 = M < 1 = L Record the rating on the first page Site meets ANY of the following criteria:points = 2 It has 3 or more priority habitats within 100 m (see next page) It is mapped as a location for an individual WDFW priority species Site has 1 or 2 priority habitats (listed on next page) with in 100m points = 1 Site does not meet any of the criteria above points = 0 Rating of Value If Score is: 2 = H 1 = M 0 = L Record the rating on the first page 0 1 -2 H 3.0. Is the habitat provided by the site valuable to society? H 3.1. Does the site provide habitat for species valued in laws, regulations, or policies? Choose only the highest score that applies to the wetland being rated . It provides habitat for Threatened or Endangered species (any plant or animal on the state or federal lists) It is a Wetland of High Conservation Value as determined by the Department of Natural Resources 1 Invasive plants cover less than 25% of the wetland area in every stratum of plants (see H 1.1 for list of strata ) Undercut banks are present for at least 6.6 ft (2 m) and/or overhanging plants extends at least 3.3 ft (1 m) over a stream (or ditch) in, or contiguous with the wetland, for at least 33 ft (10 m) Stable steep banks of fine material that might be used by beaver or muskrat for denning (> 30 degree slope) OR signs of recent beaver activity are present (cut shrubs or trees that have not yet weathered where wood is exposed ) At least ¼ ac of thin-stemmed persistent plants or woody branches are present in areas that are permanently or seasonally inundated (structures for egg-laying by amphibians ) 1 Check the habitat features that are present in the wetland. The number of checks is the number of points. It has been categorized as an important habitat site in a local or regional comprehensive plan, in a Shoreline Master Plan, or in a watershed plan Wetland Rating System for Western WA: 2014 UpdateRating Form - Effective January 1, 2015 8 WSDOT Adapted Form - March 2, 2015 Wetland name or number A Aspen Stands: Pure or mixed stands of aspen greater than 1 ac (0.4 ha). Herbaceous Balds: Variable size patches of grass and forbs on shallow soils over bedrock. Cliffs: Greater than 25 ft (7.6 m) high and occurring below 5000 ft elevation. http://wdfw.wa.gov/publications/00165/wdfw00165.pdf or access the list from here: http://wdfw.wa.gov/conservation/phs/list/ Caves: A naturally occurring cavity, recess, void, or system of interconnected passages under the earth in soils, rock, ice, or other geological formations and is large enough to contain a human. Note: All vegetated wetlands are by definition a priority habitat but are not included in this list because they are addressed elsewhere. WDFW Priority Habitats Count how many of the following priority habitats are within 330 ft (100 m) of the wetland unit: NOTE : This question is independent of the land use between the wetland unit and the priority habitat. Biodiversity Areas and Corridors: Areas of habitat that are relatively important to various species of native fish and wildlife (full descriptions in WDFW PHS report ). Old-growth/Mature forests: Old-growth west of Cascade crest – Stands of at least 2 tree species, forming a multi-layered canopy with occasional small openings; with at least 8 trees/ac (20 trees/ha) > 32 in (81 cm) dbh or > 200 years of age. Mature forests – Stands with average diameters exceeding 21 in (53 cm) dbh; crown cover may be less than 100%; decay, decadence, numbers of snags, and quantity of large downed material is generally less than that found in old-growth; 80-200 years old west of the Cascade crest. Priority habitats listed by WDFW (see complete descriptions of WDFW priority habitats, and the counties in which they can be found, in: Washington Department of Fish and Wildlife. 2008. Priority Habitat and Species List. Olympia, Washington. 177 pp. Oregon White Oak: Woodland stands of pure oak or oak/conifer associations where canopy coverage of the oak component is important (full descriptions in WDFW PHS report p. 158 – see web link above ). Riparian: The area adjacent to aquatic systems with flowing water that contains elements of both aquatic and terrestrial ecosystems which mutually influence each other. Westside Prairies: Herbaceous, non-forested plant communities that can either take the form of a dry prairie or a wet prairie (full descriptions in WDFW PHS report p. 161 – see web link above ). Instream: The combination of physical, biological, and chemical processes and conditions that interact to provide functional life history requirements for instream fish and wildlife resources. Nearshore: Relatively undisturbed nearshore habitats. These include Coastal Nearshore, Open Coast Nearshore, and Puget Sound Nearshore. (full descriptions of habitats and the definition of relatively undisturbed are in WDFW report – see web link on previous page ). Snags and Logs: Trees are considered snags if they are dead or dying and exhibit sufficient decay characteristics to enable cavity excavation/use by wildlife. Priority snags have a diameter at breast height of > 20 in (51 cm) in western Washington and are > 6.5 ft (2 m) in height. Priority logs are > 12 in (30 cm) in diameter at the largest end, and > 20 ft (6 m) long. Talus: Homogenous areas of rock rubble ranging in average size 0.5 - 6.5 ft (0.15 - 2.0 m), composed of basalt, andesite, and/or sedimentary rock, including riprap slides and mine tailings. May be associated with cliffs. Wetland Rating System for Western WA: 2014 UpdateRating Form - Effective January 1, 2015 9 WSDOT Adapted Form - March 2, 2015 Pictometry, King County, King County±0 1,000 2,000 3,000 4,000500US Feet Rivers_and_Streams_in_King_County Subject Property Parcel: 032305-9120 Approximate Wetland A Rating Unit 1 Km Habitat Classification Polygon Accessible Relatively Undisturbed Habitat 0% Accessible Low_Moderate Intensity Habitat 0.2% Relatively Undisturbed Habitat 21.3% Low_Moderate Intensity Habitat 4.1% High Intensity Habitat 74.4% Figure A AOA - 4902City of Renton Parcel: 032305-9120 Pictometry, King County, King County±0 50 100 150 20025US Feet Subject Property Parcel: 032305-9120 Approximate Wetland A Rating Unit 150' Pollution Assessment Polygon Pollution Generating Surfaces 45.0% Figure B AOA - 4902City of Renton Parcel: 032305-9120 Water Quality Atlas Map Sources: Esri, HERE, Garmin, Intermap, increment P Corp., GEBCO, USGS,FAO, NPS, NRCAN, GeoBase, IGN, Kadaster NL, Ordnance Survey, EsriJapan, METI, Esri China (Hong Kong), (c) OpenStreetMap contributors, and August 24, 2019 0 0.5 10.25Miles K AssessedWaters/Sediment WaterCategory 5 - 303dCategory 4CCategory 4BCategory 4ACategory 2Category 1 SedimentCategory 5 - 303dCategory 4CCategory 4BCategory 4ACategory 2Category 1 8/25/2018 TMDL Project Information for WRIA 8 | WA State Department of Ecology http://web.archive.org/web/20170330212555/http:/www.ecy.wa.gov:80/programs/wq/tmdl/TMDLsbyWria/tmdl-wria08.html 1/2 About us | Contact us Home Water Quality & Supply Waste & Toxics Air & Climate Cleanup & Spills Water Quality Improvement > Water Quality Improvement Projects by WRIA > WRIA 8: Cedar-Sammamish WRIA 8: Cedar-Sammamish The following table lists overview information for water quality improvement projects (including total maximum daily loads, or TMDLs) for this water resource inventory area (WRIA). Please use links (where available) for more information on a project. Counties King Snohomish Waterbody Name Pollutants Status**TMDL Lead Ballinger Lake Total Phosphorus Approved by EPA Tricia Shoblom 425-649-7288 Bear-Evans Creek Basin Fecal Coliform Approved by EPA Joan Nolan 425-649-4425Dissolved Oxygen Temperature Approved by EPA Cottage Lake Total Phosphorus Approved by EPA Has an implementation plan Tricia Shoblom 425-649-7288 Issaquah Creek Basin Fecal Coliform Approved by EPA Joan Nolan 425-649-4425 Little Bear Creek Tributaries: Trout Stream Great Dane Creek Cutthroat Creek Fecal Coliform Approved by EPA Ralph Svrjcek 425-649-7036 North Creek Fecal Coliform Approved by EPA Has an implementation plan Ralph Svrjcek 425-649-7036 Pipers Creek Fecal Coliform Approved by EPA Joan Nolan 425-649-4425 Sammamish River Dissolved Oxygen Temperature Field work starts summer 2015 Ralph Svrjcek 425-649-7036 Swamp Creek Fecal Coliform Approved by EPA Has an implementation plan Ralph Svrjcek 425-649-7036 ** Status will be listed as one of the following: Approved by EPA, Under Development or Implementation For more information about WRIA 8: Waterbodies in WRIA 8 - using the Water Quality Assessment Query Tool Watershed Information for WRIA 8 * The Department of Ecology and other state resource agencies frequently use a system of 62 "Water Resource Inventory Areas" or "WRIAs" to refer to the state's major watershed basins. http://www.ecy.wa.gov:80/programs/wq/tmdl/TMDLsbyWria/tmdl-wria08.html Go NOV MAR OCT 30 2015 2017 2018 15 captures 👤⍰❎f 🐦 26 Jul 2009 - 24 Oct 2017 ▾ About this capture 8/25/2018 TMDL Project Information for WRIA 8 | WA State Department of Ecology http://web.archive.org/web/20170330212555/http:/www.ecy.wa.gov:80/programs/wq/tmdl/TMDLsbyWria/tmdl-wria08.html 2/2 Back to top of page Last updated July 2015 About us Director Maia Bellon Tracking progress Newsroom Jobs Staff only Contact us Publications & forms Databases Laws & rules Public records disclosure Public input & events Environmental education Sustainability information 中文 | Chinese Tiếng Việt | Vietnamese 한국어 | Korean Русский | Russian Español | Spanish Accessibility Copyright © Washington State Department of Ecology Privacy Notice | Site Info | Accessibility | Contact the web team | Feedback? http://www.ecy.wa.gov:80/programs/wq/tmdl/TMDLsbyWria/tmdl-wria08.html Go NOV MAR OCT 30 2015 2017 2018 15 captures 👤 26 Jul 2009 - 24 Oct 2017 ▾ About this capture King County±0 1,000 2,000 3,000 4,000500US Feet Subject Property Parcel: 032305-9120 Approximate Wetland A Rating Unit King_County_Basins Approximate Contributing Basin Figure E AOA - 4902City of Renton Parcel: 032305-9120 Basin is >100x Larger than the size of the Wetland