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Armor Storage Yelm_Critical Areas Report GROVE ROAD PROPERTY THURSTON COUNTY, WASHINGTON CRITICAL AREAS REPORT Prepared By: Curtis Wambach, M.S. Senior Biologist and Principal 14 December 2022 360-790-1559 www.envirovector.com GROVE ROAD PROPERTY CRITICAL AREAS REPORT Prepared For: Camron McKinley Prepared By: Curtis Wambach, M.S., Senior Biologist and Principal EnviroVector Olympia, WA 98502 (360) 790-1559 www.envirovector.com 14 December 2022 Grove Road Property Critical Areas Report Page i 14 December 2022 Table of Contents 1.0 INTRODUCTION ............................................................................................................... 1 1.1 Purpose ............................................................................................................................. 1 1.2 Property Location ............................................................................................................. 1 1.3 Site Evaluation ................................................................................................................. 1 1.4 Property Description ........................................................................................................ 1 2.0 METHODOLOGY .............................................................................................................. 1 2.1 Review of Existing Literature .......................................................................................... 2 2.2 Field Investigation ............................................................................................................ 2 2.3 Wetland Identification ...................................................................................................... 2 2.3.1 Vegetation ................................................................................................................. 3 2.3.2 Soils........................................................................................................................... 3 2.3.3 Hydrology ................................................................................................................. 4 2.4 Wetland Classification and Rating ................................................................................... 4 3.0 STUDY RESULTS .............................................................................................................. 4 3.1 Background Information .................................................................................................. 4 3.1.1 Thurston County Geodata Soils ................................................................................ 4 3.1.2 Thurston County Geodata Wetlands & Streams ....................................................... 4 3.1.3 WDFW Priority Habitats and Species (PHS) Database ............................................ 5 3.1.4 Clean Water Act 303(d) ............................................................................................ 5 3.1.5 Total Maximum Daily Load (TMDL) ...................................................................... 5 3.1.6 Thurston County Geodata High Groundwater Hazard ............................................. 5 3.1.7 Thurston County Geodata FEMA Floodplain........................................................... 5 3.1.8 DNR Stream Typing Database.................................................................................. 5 3.1.9 City of Yelm Frequently Flooded Areas ................................................................... 5 3.9.10 Critical Aquifer Recharge Areas ............................................................................... 6 3.9.11 City of Yelm Wetland Map ....................................................................................... 6 3.2 Field Results ..................................................................................................................... 6 3.2.1 Wetland A ................................................................................................................. 6 3.2.2 Yelm Creek ............................................................................................................... 8 4.0 REGULATORY CONSIDERATIONS ............................................................................... 9 4.1 Wetland A ........................................................................................................................ 9 4.2 Wetland Buffer Averaging ............................................................................................. 10 4.3 Yelm Creek .................................................................................................................... 10 4.4 Critical Aquifer Recharge Areas .................................................................................... 11 4.5 Flood Damage Protection ............................................................................................... 13 5.0 POSSIBLE LAND USE ACTION .................................................................................... 13 6.0 CONCLUSION .................................................................................................................. 14 7.0 REFERENCES .................................................................................................................. 16 Grove Road Property Critical Areas Report Page 1 14 December 2022 1.0 INTRODUCTION 1.1 Purpose The purpose of this Critical Areas Report is to identify and map Critical Areas on and within three hundred (≤300) feet of the subject property. Potential wetlands and their buffers were evaluated as part of this study. This Critical Areas Report has been prepared to satisfy City of Yelm reporting requirements. 1.2 Property Location The subject property is located within the City of Yelm, Thurston County (Figure 1; Table 1). Table 1. Parcels Comprising Subject Property No# Address Parcel Number Map Coordinates Area 1 10403 GROVE RD SE 64303400300 Section 29 Township 17 Range 2E 5.77 acres 1 Parcel Total Size 5.77 acres The permitting jurisdiction is the City of Yelm. 1.3 Site Evaluation A Critical Areas evaluation was performed on the subject property on 29 June 2022. 1.4 Property Description The subject property is located on Grove Road SE within the City of Yelm, Washington (Figure 1). The property is relatively flat, but gently slopes to the west. Vegetation on the property primarily consists of European lawn grasses with some trees on the northcentral portion of the property (Appendix A, Photos 1-6). The property is undeveloped and unused. Surrounding properties consist of high density and low density residential lots, apartments, and commercial development (Appendix A, Photos 1 & 6). 2.0 METHODOLOGY This report is based on a review of existing information and field investigations. The goal of these efforts is to collect and document existing information that reflects current site conditions for assessing potential impacts. Grove Road Property Critical Areas Report Page 2 14 December 2022 2.1 Review of Existing Literature Prior to conducting fieldwork, and throughout the duration of project design, biologists reviewed existing information to identify wetlands, streams, vegetation patterns, topography, soils, wildlife habitats, and other natural resources in the project area. Existing data sources that were reviewed for this report included but were not limited to the following: • Washington U.S. Department of Agriculture, Natural Resources Conservation Service (NRCS) Soil Survey • U.S. Fish and Wildlife Service (USFWS) National Wetlands Inventory (NWI), online wetlands mapper • Washington Department of Fish and Wildlife (WDFW) Salmonscape Database • Washington Department of Fish and Wildlife (WDFW Priority and Habitat Species (PHS) Database • Washington State Department of Natural Resources (DNR) Natural Heritage Database • Federal Emergency Management Agency (FEMA) Flood Insurance Rate Maps (FIRM) and Flood Insurance Studies 2.2 Field Investigation A wetland evaluation was performed onsite as well as off-site of the subject property to determine if wetlands, streams, or their buffers extend onto the subject property. The routine on- site determination method was used to identify potential wetlands using the procedures outlined in the Corps of Engineers Wetland Delineation Manual (Environmental Laboratory, 1987) and the U.S. Army Corps of Engineers (USACE, 2010) Regional Wetland Supplement. 2.3 Wetland Identification Prior to 2010, biologists delineated wetlands according to the methods specified in the USACE Wetlands Delineation Manual (Environmental Laboratory, 1987). At that time, these methods complied with those in the Washington State Wetland Identification and Delineation Manual (Washington State Department of Ecology [Ecology], 1997). Following 2010, biologists evaluate wetlands according to the methods specified in the USACE Wetlands Delineation Manual (Environmental Laboratory, 1987) and the Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region (Version 2.0) (USACE, 2010). These methods comply with those adopted by Washington State pursuant to Washington Administrative Code (WAC) 173-22-035, Revised Code of Washington (RCW) 90.58.380. Grove Road Property Critical Areas Report Page 3 14 December 2022 2.3.1 Vegetation The dominant plants and their wetland indicator status were evaluated to determine whether the vegetation is hydrophytic. Hydrophytic vegetation is generally defined as vegetation adapted to prolonged saturated soil conditions. To meet the hydrophytic vegetation criterion, more than 50 percent of the dominant plants must be facultative, facultative wetland, or obligate, according to the plant indicator status category assigned to each plant species by the USACE National Wetland Plant List. Table 2 provides the definitions of the indicator status categories. The scientific and common names for plants follow the currently accepted nomenclature. Dominant plant species were observed and recorded on wetland determination data forms for each data plot (Appendix J). Table 2. Key to Plant Indicator Status Categories Plant Indicator Status Category Symbol Description Obligate Wetland Plants OBL Plants that almost always (>99% of the time) occur in wetlands but may rarely (<1% of the time) occur in non - wetlands Facultative Wetland Plants FACW Plants that often (67% to 99% of the time) occur in wetlands but sometimes (1% to 33% of the time) occur in non-wetlands Facultative Plants FAC Plants with a similar likelihood (33% to 66% of the time) of occurring in both wetlands and non-wetlands Facultative Upland Plants FACU Plants that sometimes (1% to 33% of the time) occur in wetlands but occur more often (67% to 99% of the time) in non-wetlands Upland Plants UPL Plants that rarely (<1% of the time) occur in wetlands and almost always (> 99% of the time) occur in non-wetlands 2.3.2 Soils Soils were excavated to eighteen (18) inches or more below the surface within test pits to evaluate soil characteristics and hydrological conditions throughout the property. Soil chroma (color) is evaluated using the Munsell Color Chart (Munsell Color, 1988). Generally, an area must have hydric soils to be considered a wetland. Hydric soil forms when soils are saturated, flooded, or ponded long enough during the growing season to develop anaerobic conditions in the upper portion. Biological activities in saturated soil result in reduced concentrations of oxygen that in turn result in a preponderance of organisms that use anaerobic processes for metabolism. Over time, anaerobic biological processes result in certain soil color patterns, which are used as indicators of hydric soil. Typically, low-chroma colors are formed in the matrix of hydric soil. Bright-colored redoximorphic features form within the matrix under a fluctuating water table. Other important hydric soil indicators include organic matter accumulations in the surface layer, reduced sulfur odors, and organic matter staining in the subsurface. Grove Road Property Critical Areas Report Page 4 14 December 2022 2.3.3 Hydrology The project area was examined for evidence of hydrology. The USACE (2005) provides a technical standard for monitoring hydrology on such sites. This standard requires 14 or more consecutive days of flooding or ponding, or a water table twelve (12) in. (thirty [30] cm) or less below the soil surface, during the growing season at a minimum frequency of five (5) years in ten (10) (fifty percent [50%] or higher probability). The USACE 2010 Regional Supplement provides a list of hydrology indicators to evaluate whether the hydrology standard is satisfied. If wetland hydrology, including pooling, ponding, and soil saturation, is not clearly evident, hydrological conditions may be observed through surface or soil indicators. Indicators of hydrological conditions include oxidized root channels, drainage patterns, drift lines, sediment deposition, watermarks, historic records, visual observation of saturated soils, and visual observation of inundation. 2.4 Wetland Classification and Rating Delineated wetlands were classified according to the USFWS Classification of Wetlands and Deepwater Habitats of the United States (USFWS, 1979). Hydrogeomorphic classifications were assigned to wetlands using USACE methods established in A Hydrogeomorphic Classification for Wetlands (USACE, 1993) and were then rated using the revised Washington State Wetland Rating System for Western Washington. 3.0 STUDY RESULTS 3.1 Background Information 3.1.1 Thurston County Geodata Soils Two (2) non-hydric soil types and one (1) hydric soil type are mapped on the subject property by the Thurston County Geodata Center database (Appendix B; Table 3). Table 3. Thurston County Geodata Soils Summary Soil Unit Hydric Comments McKenna Gravelly silt loam, 0 to 5% slopes Yes Located in the Yelm Creek riparian corridor Spanaway gravelly sandy loam, 0-3% slopes No Located on the eastern portion of the subject property Spanaway gravelly sandy loam, 3-15% slopes No Located on the southern portion of the subject property 3.1.2 Thurston County Geodata Wetlands & Streams Yelm Creek and one (1) wetland is mapped on the western portion of the subject property by the Thurston County Geodata Center Database (Appendix C). Grove Road Property Critical Areas Report Page 5 14 December 2022 3.1.3 WDFW Priority Habitats and Species (PHS) Database One (1) wetland is mapped on the western portion of the subject property by the Washington department of Fish and Wildlife (WDFW) Priority Habitats and Species (PHS) Database (Appendix D). The wetland extends along the Yelm Creek corridor. Yelm Creek is mapped along the western property line. Chinook Salmon (Oncorhynchus tshawytscha), pink salmon (Oncorhynchus gorbuscha), Sockeye salmon (Oncorhynchus nerka), cutthroat trout (Oncorhynchus clarki), steelhead trout (Oncorhynchus mykiss), Coho salmon (Oncorhynchus kisutch) are mapped in Yelm Creek. Mazama pocket gopher and other wetlands are mapped over one thousand (>1,000) feet east of the subject property. 3.1.4 Clean Water Act 303(d) Yelm Creek, located on the western edge of the subject property, is mapped as a 303(d) water by the Department of Ecology Water Quality Atlas Map (Appendix E). 3.1.5 Total Maximum Daily Load (TMDL) No TMDL is mapped over the subject property by the Department of Ecology Water Quality Atlas Map (Appendix F). 3.1.6 Thurston County Geodata High Groundwater Hazard A high groundwater hazard area is mapped over the western portion of the subject property by the Thurston County Geodata Center Database (Appendix G). The majority of the subject property is located within the High Groundwater Review Area as mapped by Thurston County Geodata Center. 3.1.7 Thurston County Geodata FEMA Floodplain The western edge of the subject property is mapped as a FEMA hundred (100) year flood zone by the Thurston County Geodata Center (Appendix H). 3.1.8 DNR Stream Typing Database Yelm Creek is mapped as a Type F water by the State Department of Natural Resources (DNR) database (Appendix I). 3.1.9 City of Yelm Frequently Flooded Areas The City of Yelm maps frequently flooded areas along the Yelm Creek corridor on the western edge of the subject property (Appendix L). Grove Road Property Critical Areas Report Page 6 14 December 2022 3.9.10 Critical Aquifer Recharge Areas Almost the entire subject property is mapped as Critical Aquifer Recharge Area (Appendix M). Only a small portion of the subject property on the northwestern corner is not mapped as Critical Aquifer Recharge Area. 3.9.11 City of Yelm Wetland Map The City of Yelm maps an emergent wetland and Yelm Creek on the western portion of the subject property (Appendix N). The City maps part of this wetland as scrub shrub. 3.2 Field Results One (1) wetland, labeled Wetlands A, and Yelm Creek have been identified and delineated on the western portion of the subject property (Figures 2 & 3; Appendix A, Photos 7-32). Wetland A is a shallow depression that extends along the Yelm Creek corridor on the western edge of the subject property. Wetland A is located within the flood plain of the Yelm Creek corridor. A High Groundwater Hazard Area is mapped by Thurston County within the on-site portion of Wetland A. A summary of the Critical Areas is in Table 4. Table 4. Summary of Critical Areas Results WETLANDS Wetland Area of Wetland Cowardin Class Buffer Condition Habitat Features Comments On-site Total Wetland A 34,253 sf (0.79 acres) 146,099 sf (3.35 acres) PEMC1 Forested & grasses Amphibian habitat Extends along the western property line STREAMS Stream Reach Onsite Depth & Width Stream Bed Fish Riparian Habitat Comments Yelm Creek 570 ft Depth ~1 ft Width ~1 ft Mud, Excavated Channel Mapped salmonid presence Maintained Grass Fields Seasonal stream dry for nearly the entire year at the subject property 1. PEMB: Palustrine Emergent Seasonally-flooded 3.2.1 Wetland A The Cowardin (1979) classification of Wetland A is a Palustrine Emergent Seasonally-flooded (PEMC) wetland (Figure 6; Table 4). Wetland A is associated with Yelm Creek, but water may impound during the wetter parts of the year. The Wetland A boundary has been delineated using orange flags on wooden lath (Appendix A, Photos 7-18). Wetland flags have been labeled A-1 to A-11 (Figure 4). The off-site portion of Wetland A has been mapped using aerial photographs and or approximated using LiDAR (Figure 3). Grove Road Property Critical Areas Report Page 7 14 December 2022 Wetland Conditions Wetland A is located offsite northwest of the subject property (Figure 3; Appendix A). Vegetation consists of a forested corridor and maintained pasture. No significant sources of pollutants occur within one hundred and fifty (150) feet of Wetland A (Figure 7). Habitat within one (1) kilometer is shown in Figure 8 and the wetland basin is shown in Figure 9. Hydrology Hydrology derives from the Yelm Creek corridor. The wetland was dry during the site evaluation. No primary indicators of hydrology were identified in the wetland. However, two (2) secondary indicators were present that include geomorphic position and FAC neutral test. Vegetation Dominant plant species identified in Wetland A include: Common Name Scientific Name Wetland Indicator Status Native Reed canarygrass Phalaris arundinacea FACW No Dominant vegetation located in the wetland buffer: Common Name Scientific Name Wetland Indicator Status Native Reed canarygrass Phalaris arundinacea FACW Non-native Velvet grass Holcus lanatus FAC Non-native Rye grass Lolium perenne FAC Non-native Sweet vernal grass Anthoxanthum odoratum FACU Non-native Dandelion Taraxacum officinale FACU Non-native Hairy cat’s ear Hypochaeris radicata FACU Non-native Orchard grass Dactylis glomerata FACU Non-native Red fescue Festuca rubra FAC Native & Non-native Tall fescue Festuca arundinacea FAC Non-native Shepherd's purse Capsella bursa-pastoris FACU Non-native Cleavers Galium aparine FACU Native Chickweed Stellaria media FACU Non-native American vetch Vicia americana FAC Native Evergreen blackberry Rubus laciniatus FACU Non-native Oxeye daisy Leucanthemum vulgare FACU Non-native Saint john’s wort Hypericum perforatum FACU Non-native Senecio Senecio sp. FACU Non-native Himalayan blackberry Rubus armeniacus FAC Non-native Cheatgrass Bromus tectorum FACU Non-native Oregon grape Mahonia nervosa FACU Native Red clover Trifolium pratense FACU Non-native Grove Road Property Critical Areas Report Page 8 14 December 2022 Soils Soils in Wetland A consists of a black (10YR 2/1) sandy loam from surface to twenty (20) inches of the surface. Upland soils adjacent to the wetland consist of a black (10YR 2/2) sandy gravelly loam from surface to twenty (20) inches of the surface. Habitat Features Potential amphibian habitat occurs in Wetland A if water ponds long enough during the breeding season. 3.2.2 Yelm Creek Yelm Creek is a small, mud-bottom ditch that was dry during the site evaluation and may be dry for most of the year (Appendix A, Photos 5-8). Yelm Creek is very low gradient, often stagnant or dry in summer and early fall, and is often dry in the upper reaches, according to the Nisqually Watershed (WRIA 13) Study that includes Yelm Creek. The Ordinary High Water Mark (OHWM) of Yelm Creek has been delineated marking the boundary with pink flags on wooden lath (Appendix A, Photos 23-31). Stream flags have been labeled Sa-1 to Sa-11 (Figure 4). According to Thurston County (2018) Water Resources Monitoring Report, Yelm Creek is one (1)-foot wide and disappears from the surface for much of the year through the City of Yelm. Surface flow resumes closer to the Nisqually River, where the final half mile provides habitat for a late winter run of Chum Salmon. Although the WDFW PHS database maps salmonids in Yelm Creek, no water capacity to support salmonids is likely to occur at the subject property. Although the DNR Stream Typing database indicates fish use in Yelm Creek, low water capacity would discourage fish presence at the subject property. Fish occurrence in Yelm Creek at the subject property is unlikely as a result of low water capacity. Grove Road Property Critical Areas Report Page 9 14 December 2022 4.0 REGULATORY CONSIDERATIONS Wetland regulatory considerations have been summarized in Table 5. Table 5. Summary of Regulatory Considerations Wetland Wetland Area of Wetland Category Habitat Score Standard Buffer Reduced Buffer Comments On-site Total Wetland A 34,253 sf (0.79 acres) 146,099 sf (3.35 acres) III 5 (L, L, H) 150 ft 112.5 ft Buffer reduction or averaging allowed Stream Stream Reach On-site Depth & Width DNR Mapped Stream Type Standard Stream Buffer Reduced Buffer Comments Yelm Creek 570 ft Depth ~1 ft Width ~1 ft Type F 150 ft 112.5 Buffer reduction or averaging allowed 4.1 Wetland A Wetland A has been classified as a Category III wetland using the Department of Ecology (2014) Wetland Rating Form for Western Washington as required under Yelm Municipal Code (YMC) 18.21.060(B)---Wetlands-Wetland Ratings. Wetland A is a Depressional wetland under the Department of Ecology (2014) Wetland Rating System. Under YMC 18.21.060(F)(6)(a) ---Standard Wetland Buffers, wetland buffers are calculated based on the wetland category and habitat function determined by the Washington State Department of Ecology (2014) Wetland Rating System. Wetland A scored a “Low (M)” site potential to provide habitat, a “Low (L)” landscape potential to support habitat, and a “High (H)” potential value to society. Wetlands that rate as an L, L, H (order of ratings are not important) receive a score of five (5) points for total habitat functions, which translates to twenty (20) to twenty-eight (28) points on the 2004 wetland rating system for which the City of Yelm Code references (Insert 1; Appendix L). The standard buffer for Category III wetlands that score five (5) points (20-28 under the 2004 Rating System) for Habitat Functions provided by the rating of L, L, H requires a buffer width of one hundred fifty (150) feet (YMC 18.21.060(F)(6)(a)--- Standard Buffer Widths) (Figure 5; Table 5). Under YMC 18.21.060(F)(6)(d)---Wetland Buffer Width Averaging, the standard buffer width can be averaged to no less than seventy-five percent (75%) of the standard width. Thereby, the one hundred fifty (150)-foot buffer on Wetland A could be averaged to one hundred-twelve and a half (112.5) feet as long as no loss to total buffer area or function pursuant to compliance with criteria under YMC 18.21.060(F)(6)(d). Grove Road Property Critical Areas Report Page 10 14 December 2022 Insert 1. Department of Ecology Rating System Conversion from 2004 to 2014 numbers 2004 Final Habitat Score 2014 29-36 High 8-9 20-28 Medium 5-7 < 19 Low 3-4 4.2 Wetland Buffer Averaging Wetland buffer reconfiguration is allowed if needed to achieve optimal buildable area and maintain the ongoing agricultural activities on the subject property. Wetland buffer averaging allowed under YMC 18.21.060---Wetland Buffers, would permit decreasing a buffer size to accommodate for the building area and adding the lost buffer to areas where no impacts will occur. Therefore, a zero-net loss of a total buffer will be achieved through this process. The approval authority may authorize or require reconfiguration of wetland buffers under YMC 18.21.060(F)(6)(d) as follows: i. It will not reduce wetland functions or functional performance; ii. The wetland contains variations in sensitivity due to existing physical characteristics or the character of the buffer varies in slope, soils, or vegetation, and the wetland would benefit from a wider buffer in places and would not be adversely impacted by a narrower buffer in other places; iii. The total area contained in the buffer area after averaging is no less than that which would be contained within the standard buffer; and iv. The buffer width is not reduced to less than seventy five percent (<75%) of the standard width or 35 feet. 4.3 Yelm Creek Under YMC 18.21.110(2)(b) --- Riparian Habitat Areas, a riparian habitat area width of one- hundred fifty (150) feet is established along Yelm Creek, a Type 5, intermittent stream with low mass wasting potential. Under YMC 18.21.110(2)(d) --- Riparian Habitat Area Width Averaging, the administrator may allow the recommended riparian habitat area width to be reduced only if the following conditions are met: i. The width reduction will not reduce stream or habitat functions, including those of non- fish habitat; ii. The width reduction will not degrade the habitat, including habitat for anadromous fish; iii. The proposal will provide additional habitat protection; iv. The total area contained in the riparian habitat area of each stream on the development proposal site is not decreased; v. The recommended riparian habitat area width is not reduced by more than twenty-five percent (>25%) in any one location; Grove Road Property Critical Areas Report Page 11 14 December 2022 vi. The width reduction will not be located within another critical area or associated buffer; and vii. The reduced riparian habitat area width is supported by the best available science. 4.4 Critical Aquifer Recharge Areas Critical aquifer recharge areas are those areas with critical recharging effect on aquifers used for potable water as defined by WAC 365-190-030(2) and YMC 18.21.070---Critical aquifer recharge areas. The entire City of Yelm and its urban growth area has prevailing geologic conditions associated with infiltration rates that create a high potential for contamination of ground water resources. Under YMC 18.21.070(A)---Critical Aquifer Recharge Areas Designation, critical aquifer recharge areas are those areas with a critical recharging effect on aquifers used for potable water as defined by WAC 365-190-030(2). A critical aquifer recharge area has prevailing geologic conditions associated with infiltration rates that create a high potential for contamination of ground water resources or contribute significantly to the replenishment of ground water. Under YMC 18.21.070(B)---Designation of Critical Aquifer Recharge Areas, the entire city of Yelm and its urban growth area is identified as a highly susceptible critical aquifer recharge area. Under YMC 18.21.070(C)---Performance standard- general requirements must meet the following criteria: 1. Activities may only be permitted in a critical aquifer recharge area if the applicant can show that the proposed activity will not cause contaminants to enter the aquifer and that the proposed activity will not adversely affect the recharging of the aquifer. 2. The proposed activity must comply with the water source protection requirements and recommendations of the U.S. Environmental Protection Agency, Washington State Department of Health, and the Thurston County environmental health division. 3. All new development, redevelopment, and small parcel development shall meet the water quality requirements of the stormwater manual as adopted by the city of Yelm. Under YMC 18.21.070(D)---Performance Standards – Specific Uses: 1. Storage Tanks. All storage tanks proposed to be located in a critical aquifer recharge area must comply with local building code requirements and must conform to the following requirements: a. Underground Tanks. All new underground storage facilities proposed for use in the storage of hazardous substances or hazardous wastes shall be designed and constructed so as to: i. Prevent releases due to corrosion or structural failure for the operational life of the tank; ii. Be protected against corrosion, constructed of noncorrosive material, steel clad with a noncorrosive material, or designed to include a secondary containment system to prevent the release or threatened release of any stored substances; and Grove Road Property Critical Areas Report Page 12 14 December 2022 iii. Use material in the construction or lining of the tank that is compatible with the substance to be stored. b. Aboveground Tanks. All new aboveground storage facilities proposed for use in the storage of hazardous substances or hazardous wastes shall be designed and constructed so as to: i. Not allow the release of a hazardous substance to the ground, ground waters, or surface waters; ii. Have a primary containment area enclosing or underlying the tank or part thereof; and iii. A secondary containment system either built into the tank structure or a dike system built outside the tank for all tanks. 2. Vehicle Repair and Servicing. a. Vehicle repair and servicing must be conducted over impermeable pads and within a covered structure capable of withstanding normally expected weather conditions. Chemicals used in the process of vehicle repair and servicing must be stored in a manner that protects them from weather and provides containment should leaks occur. b. No dry wells shall be allowed in critical aquifer recharge areas on sites used for vehicle repair and servicing. Dry wells existing on the site prior to facility establishment must be abandoned using techniques approved by the state Department of Ecology prior to commencement of the proposed activity. 3. Use of Reclaimed Water for Surface Percolation or Direct Recharge. Water reuse projects for reclaimed water must be in accordance with the adopted water or sewer comprehensive plans that have been approved by the State Departments of Ecology and Health. a. Use of reclaimed water for surface percolation must meet the ground water recharge criteria given in RCW 90.46.010(10) and 90.46.080(1). The State Department of Ecology may establish additional discharge limits in accordance with RCW 90.46.080(2). b. Direct injection must be in accordance with the standards developed by authority of RCW 90.46.042. Grove Road Property Critical Areas Report Page 13 14 December 2022 4.5 Flood Damage Protection Under 18.21.080---Frequently flooded areas, frequently flooded areas shall include areas identified by the Flood Insurance Rate Map(s) and areas mapped by Thurston County as high groundwater flood hazard areas. Prior to any clearing, grading, dumping, drilling, dredging, filling, or the construction or reconstruction of any structure, the city will need to approve the underlying permit. All site designs must adhere to the requirements under YMC 18.21.080 and 18.21.090, including but not limited to: placing structures outside of the floodplain, utilizing methods to minimize flood damage, utility protection, anchoring, etc. FEMA one hundred (100) year flood plan is illustrated in Appendix H, and areas mapped by Thurston County as high ground water flood hazard areas are illustrated in Appendix I. City of Yelm frequently flooded areas are illustrated in Appendix L. 5.0 POSSIBLE LAND USE ACTION The eastern portion of the subject property is outside of wetlands, streams, and their buffers, totaling 115,064 sf (2.64 acres) in size. However, much of the area outside of wetlands, streams, and buffers is within the High Groundwater Review Area and Critical Aquifer Recharge Area. No reference to the High Groundwater Hazard Area was found in the City of Yelm Code. This is a County designation that the City may not recognize. However, the City of Yelm regulates Critical Aquifer Recharge Areas (Appendix L; Section 4.4 of this report). The entire City of Yelm and its urban growth area has prevailing geologic conditions associated with infiltration rates that create a high potential for contamination of ground water resources. Under YMC 18.21.070(C)---Performance standard- general requirements must meet the following criteria: 1. Activities may only be permitted in a critical aquifer recharge area if the applicant can show that the proposed activity will not cause contaminants to enter the aquifer and that the proposed activity will not adversely affect the recharging of the aquifer. 2. The proposed activity must comply with the water source protection requirements and recommendations of the U.S. Environmental Protection Agency, Washington State Department of Health, and the Thurston County environmental health division. 3. All new development, redevelopment, and small parcel development shall meet the water quality requirements of the stormwater manual as adopted by the city of Yelm. Other regulations regarding the Critical Aquifer Recharge Areas may apply to specific projects. Wetland and stream buffers can be reduced by twenty-five percent (25%) through buffer averaging, which allows the reconfiguration of the buffer with no net loss of buffer area or buffer functions. Grove Road Property Critical Areas Report Page 14 14 December 2022 6.0 CONCLUSION The subject property is located on Grove Road SE within the City of Yelm, Washington. The property is relatively flat, but gently slopes to the west. Vegetation on the property primarily consists of European lawn grasses with some trees on the northcentral portion of the property. The property is undeveloped and unused. Surrounding properties consist of high density and low density residential lots, apartments, and commercial development. One (1) wetland, labeled Wetlands A, and Yelm Creek have been identified and delineated on the western portion of the subject property. Wetland A is a shallow depression that extends along the Yelm Creek corridor on the western edge of the subject property. Wetland A is located within the flood plain of the Yelm Creek corridor. A High Groundwater Hazard Area is mapped by Thurston County within the on-site portion of Wetland A. Wetland A has been classified as a Category III wetland using the Department of Ecology (2014) Wetland Rating Form for Western Washington as required under Yelm Municipal Code (YMC) 18.21.060(B)---Wetlands-Wetland Ratings. Wetland A is a Depressional wetland under the Department of Ecology (2014) Wetland Rating System. Under YMC 18.21.060(F)(6)(a) ---Standard Wetland Buffers, wetland buffers are calculated based on the wetland category and habitat function determined by the Washington State Department of Ecology (2014) Wetland Rating System. Wetland A scored a “Low (M)” site potential to provide habitat, a “Low (L)” landscape potential to support habitat, and a “High (H)” potential value to society. Wetlands that rate as an L, L, H (order of ratings are not important) receive a score of five (5) points for total habitat functions, which translates to twenty (20) to twenty-eight (28) points on the 2004 wetland rating system for which the City of Yelm Code references. The standard buffer for Category III wetlands that score five (5) points (20-28 under the 2004 Rating System) for Habitat Functions provided by the rating of L, L, H requires a buffer width of one hundred fifty (150) feet (YMC 18.21.060(F)(6)(a)--- Standard Buffer Widths). Under YMC 18.21.060(F)(6)(d)---Wetland Buffer Width Averaging, the standard buffer width can be averaged to no less than seventy-five percent (75%) of the standard width. Thereby, the one hundred fifty (150)-foot buffer on Wetland A could be averaged to one hundred-twelve and a half (112.5) feet as long as no loss to total buffer area or function pursuant to compliance with criteria under YMC 18.21.060(F)(6)(d). Under YMC 18.21.110(2)(b) --- Riparian Habitat Areas, a riparian habitat area width of one- hundred fifty (150) feet is established along Yelm Creek, a Type 5, intermittent stream with low mass wasting potential. Under YMC 18.21.110(2)(d) --- Riparian Habitat Area Width Averaging, the administrator may allow the recommended riparian habitat area width to be reduced only if the following conditions are met: i. The width reduction will not reduce stream or habitat functions, including those of non- fish habitat; ii. The width reduction will not degrade the habitat, including habitat for anadromous fish; iii. The proposal will provide additional habitat protection; Grove Road Property Critical Areas Report Page 15 14 December 2022 iv. The total area contained in the riparian habitat area of each stream on the development proposal site is not decreased; v. The recommended riparian habitat area width is not reduced by more than twenty-five percent (>25%) in any one location; vi. The width reduction will not be located within another critical area or associated buffer; and vii. The reduced riparian habitat area width is supported by the best available science. The eastern portion of the subject property is outside of wetlands, streams, and their buffers, totaling 115,064 sf (2.64 acres) in size. However, much of the area outside of wetlands, streams, and buffers is within the High Groundwater Review Area and Critical Aquifer Recharge Area. No reference to the High Groundwater Hazard Area was found in the City of Yelm Code. This is a County designation that the City may not recognize. However, the City of Yelm regulates Critical Aquifer Recharge Areas (Appendix L; Section 4.4 of this report). The entire City of Yelm and its urban growth area has prevailing geologic conditions associated with infiltration rates that create a high potential for contamination of ground water resources. Under YMC 18.21.070(C)---Performance standard- general requirements must meet the following criteria: 1. Activities may only be permitted in a critical aquifer recharge area if the applicant can show that the proposed activity will not cause contaminants to enter the aquifer and that the proposed activity will not adversely affect the recharging of the aquifer. 2. The proposed activity must comply with the water source protection requirements and recommendations of the U.S. Environmental Protection Agency, Washington State Department of Health, and the Thurston County environmental health division. 3. All new development, redevelopment, and small parcel development shall meet the water quality requirements of the stormwater manual as adopted by the city of Yelm. Other regulations regarding the Critical Aquifer Recharge Areas may apply to specific projects. Wetland and stream buffers can be reduced by twenty-five percent (25%) through buffer averaging, which allows the reconfiguration of the buffer with no net loss of buffer area or buffer functions. Grove Road Property Critical Areas Report Page 16 14 December 2022 7.0 REFERENCES Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of Wetlands and Deepwater Habitats of the United States. U.S. Fish and Wildlife Service, Department of the Interior. FWSOBS-70/31. Environmental Laboratory. 1987. Corps of Engineers Wetlands Delineation Manual. Technical Report Y-87-1, US Army Engineer Waterways Experiment Station, Vicksburg, Miss. Hitchcock, C.L., and A. Cronquist. 1973. Flora of the Pacific Northwest. University of Washington Press. 730 pp. Iowa State University. 1995. Hydric Soils of Washington State. U.S. Department of Agriculture, Natural Resources Conservation Service. December 5. Munsell Color. 1988. Munsell Soil Color Charts. Kollmorgen Instruments Corp., Baltimore, Maryland. Reed, P.B. Jr. 1988. National List of Plant Species that Occur in Wetlands: Northwest (Region 9). USFWS Biol. Report 88. Reed, P.B. Jr. 1993. Supplement to: National List of Plant Species that Occur in Wetlands: Northwest (Region 9). USFWS Biol. Report 88. Reed, P.B. Jr. 1998. National List of Plant Species that Occur in Wetlands: Northwest (Region 9). USFWS Update. Thurston County Geodata center http://www.geodata.org/online.html U.S. Department of Agriculture, Soil Conservation Service. 1991. Hydric Soils of the United States. U.S. Department of Agriculture, Soil Conservation Service. 1973. Thurston County Area Soil Survey. U.S. Army Corps of Engineers. 1993. A Hydrogeomorphic Classification for Wetlands. Wetlands Research Program Technical Report WRP-DE-4 written by Mark M. Brinson. August 1993. U.S. Army Corps of Engineers. 2005. Technical Standard for Water-Table Monitoring of Potential Wetland Sites. Wetlands Regulatory Assistance Program. June 2005. U.S. Fish and Wildlife Service. 1979. Classification of Wetlands and Deepwater Habitats of the United States. December. Grove Road Property Critical Areas Report Page 17 14 December 2022 Washington State Department of Ecology. 1997. Washington State Wetland Identification and Delineation Manual. March. Washington State Department of Ecology. 2004. Washington State Wetland Rating System for Western Washington. Ecology Publication # 04-06-025. August. Grove Road Property Critical Areas Report Page 18 14 December 2022 FIGURES SubjectPropertyGrove Road SEHighway 507Highway 507Highway 507Highway 507Highway 510Yelm Highway SEOld Yelm McKenna Road SEStevens Street NEWest Road SECoates Road NWCullens Road SECreek Street SE360-790-1559curtis@envirovector.comwww.envirovector.comFigure 12000'0Scale: 1" = 2000'Vicinity Map17 july 2022Grove RoadCity of Yelm Grove Road SE Subject Property Existing Conditions Figure 2 17 July 2022 Scale: 1"= 100' 0 100' 360-790-1559 curtis@envirovector.com www.envirovector.com Grove Road Yelm Creek Wetland (Delineated) Wetland (Not Delineated) Grove Road SE Subject Property Yelm Ave SE (HWY 507) Existing Conditions Figure 2 17 July 2022 Scale: 1"= 180' 0 180' 360-790-1559 curtis@envirovector.com www.envirovector.com Grove Road Yelm Creek Wetland (Delineated) Wetland (Not Delineated) A-2 A-1 A-3 A-4 A-5 A-6 A-7 A-8 A-9 A-10 A-11 TP-2 TP-1 Sa-1 Sa-2 Sa-3 Sa-4 Sa-5 Sa-6 Sa-7 Sa-8 Sa-9 Sa-10 Sa-11 Subject Property Wetland A Delineation Figure 4 17 July 2022 Scale: 1"= 100' 0 100' 360-790-1559 curtis@envirovector.com www.envirovector.com Grove Road Yelm Creek Wetland (Delineated) Wetland (Not Delineated) A-1 A-1 Wetland Delineation Test PlotTP-1 Sa-1 Sa-2 Stream Delineation Subject Property 112.5'150' 150' 112.5' Wetland & Stream Buffers Figure 5 17 July 2022 Scale: 1"= 100' 0 100' 360-790-1559 curtis@envirovector.com www.envirovector.com Grove Road Stream Buffer Wetland Buffer Yelm Creek Wetland (Delineated) Wetland (Not Delineated) Reduced Stream Buffer Reduced Wetland Buffer Grove Road SE Subject Property Yelm Ave SE (HWY 507) Hydroperiods & Vegetation Classes Figure 6 17 July 2022 Scale: 1"= 180' 0 180' 360-790-1559 curtis@envirovector.com www.envirovector.com Grove Road Emergent Seasonally-flooded Subject Property Potential Pollutants within 150 feet of Wetland Figure 7 360-790-1559 curtis@envirovector.com www.envirovector.com Grove RoadWetland (146,099 sf) 150 ft polygon (531,744sf) Pollutants (58,986;11%) 200'0 Scale: 1" = 200' 17 July 2022 Wetland ASubjectProperty17 July 2022Scale: 1"= 1300'01300'360-790-1559curtis@envirovector.comwww.envirovector.comFigure 81 KM PolygonGrove RoadAccessible Moderate to Low Intensity Land Use(455,540 sf, 10 acres, 1%)Relatively Undisturbed Habitat(1,819,308 sf, 42 acres, 4.2%)Low to Moderate Intensity Land Use+ accessible Low to Moderate(18,844,781 sf, 433 acres, 43.1%)High Intensity Land Use(22,773,805 sf, 523 acres, 52%)1km Polygon(43,676,183 sf, 1,003 acres)H2.1: 0% + 1% /2 = 0.5% (0 points)H2.2: 4.2% + 43.1%/2 = 25.8% (1 point)H2.3: High Intensity = 52% (-2 points)Accessible Habitat (0 sf, 0 acres, 0%) 17 July 2022Scale: 1"= 4000'04000'Wetland A (145,099 sf)Contributing Basin (188,007,909 sf; 1,286x wetland)360-790-1559curtis@envirovector.comwww.envirovector.comFigure 9Contributing BasinGrove Road Grove Road Property Critical Areas Report Page 19 14 December 2022 APPENDIX A Photographs Grove Road Property Critical Areas Report Page 20 14 December 2022 Subject Property Photo 1. Wetland A & Yelm Creek, apartments in background Photo 2. Grass field on eastern portion of property Photo 3. Grass field on eastern portion of property Photo 4. Grass field on eastern portion of property Photo 5. Grass field under power lines Photo 6. Subject property east side facing west Grove Road Property Critical Areas Report Page 21 14 December 2022 Wetland A Photo 7. Wetland A boundary, reed canarygrass (FACW) Photo 8. Recording point, Trimble Geo 7x, sub-foot accuracy Photo 9. Wetland flag, apartments in background Photo 10. Reed canarygrass (FACW) at Wetland A flag Photo 11. Wetland A flag A-2 Photo 12. Wetland A flag A-4 Grove Road Property Critical Areas Report Page 22 14 December 2022 Photo 13. Wetland A flag A-5 Photo 14. Wetland A flag A-7 Photo 15. Wetland A flag A-9 Photo 16. Wetland A flag A-8 Photo 17. Wetland A flag A-10 Photo 18. Wetland A flag A-11 Grove Road Property Critical Areas Report Page 23 14 December 2022 Photo 19. Wetland test plot TP-1, soils Photo 20. Wetland test plot TP-1, Vegetation Photo 21. Upland test plot TP-2 Photo 22. Upland test plot TP-2 Grove Road Property Critical Areas Report Page 24 14 December 2022 Yelm Creek Photo 23. Yelm Creek, flag Sa-2 Photo 24. Yelm Creek, flag Sa-2 Photo 25. Yelm Creek, flag with apartments in background Photo 26. Yelm Creek, flag Sa-4 Photo 27. Yelm Creek, flag Sa-6 Photo 28. Yelm Creek, flag Sa-8 Grove Road Property Critical Areas Report Page 25 14 December 2022 Photo 29. Yelm Creek, flag Sa-9 Photo 30. Yelm Creek, flag Sa-10 Photo 31. Yelm Creek, flag Sa-11 Photo 32. Placing flags on Yelm Creek Grove Road Property Critical Areas Report Page 26 14 December 2022 APPENDIX B Thurston County Geodata Soils Grove Road Property Critical Areas Report Page 27 14 December 2022 Subject Property Grove Road Property Critical Areas Report Page 28 14 December 2022 APPENDIX C Thurston County Geodata Wetlands & Streams Grove Road Property Critical Areas Report Page 29 14 December 2022 Subject Property Grove Road Property Critical Areas Report Page 30 14 December 2022 APPENDIX D Washington Department of Fish and Wildlife (WDFW) Priority Habitats and Species (PHS) Database Grove Road Property Critical Areas Report Page 31 14 December 2022 Mazama pocket gopher ( MPG) mapped occurrence Subject property Wetland System: Freshwater Emergent Wetland Wetland System: Freshwater Emergent Wetland Mapped in Township: -Townsend's Big-eared Bat (Corynorhinus townsendii) -Yuma myotis (Myotis yumanensis) Chinook Salmon (Oncorhynchus tshawytscha) Pink salmon (Oncorhynchus gorbuscha) Sockeye (Oncorhynchus nerka) Cutthroat Trout (Oncorhynchus clarki) Steelhead Trout (Oncorhynchus mykiss) Coho salmon (Oncorhynchus kisutch) Grove Road Property Critical Areas Report Page 32 14 December 2022 APPENDIX E Clean Water Act 303 (d) List Grove Road Property Critical Areas Report Page 33 14 December 2022 Subject Property Subject property Grove Road Property Critical Areas Report Page 34 14 December 2022 APPENDIX F Total Maximum Daily Load (TMDL) Grove Road Property Critical Areas Report Page 35 14 December 2022 Subject Property Grove Road Property Critical Areas Report Page 36 14 December 2022 APPENDIX G Thurston County Geodata High Groundwater Hazard Area Grove Road Property Critical Areas Report Page 37 14 December 2022 Subject Property Grove Road Property Critical Areas Report Page 38 14 December 2022 APPENDIX H FEMA Floodplains Grove Road Property Critical Areas Report Page 39 14 December 2022 Subject Property Grove Road Property Critical Areas Report Page 40 14 December 2022 APPENDIX I DNR Stream Typing Database Grove Road Property Critical Areas Report Page 41 14 December 2022 Subject Property Grove Road Property Critical Areas Report Page 42 14 December 2022 APPENDIX J Datasheets US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0 WETLAND DETERMINATION DATA FORM – Western Mountains, Valleys, and Coast Region Project/Site: Grove Road City/County: Thurston County Sampling Date:29 June 2022 Applicant/Owner: Grove Road State: WA Sampling Point: TP-A1 Investigator(s): Curtis Wambach Section, Township, Range: Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%): Subregion (LRR): Lat: Long: Datum: Soil Map Unit Name: NWI classification: Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.) Are Vegetation no, Soil no, or Hydrology no significantly disturbed? Are “Normal Circumstances” present? Yes No Are Vegetation no, Soil no, or Hydrology no 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 Hydric Soil Present? Yes No Wetland Hydrology Present? Yes No Is the Sampled Area within a Wetland? Yes No Remarks: VEGETATION – Use scientific names of plants. Absolute Dominant Indicator Tree Stratum (Plot size: 20') % Cover Species? Status 1. 2. 3. 4. = Total Cover Sapling/Shrub Stratum (Plot size: 12') 1. 2. 3. 4. 5. = Total Cover Herb Stratum (Plot size: 6') 1. Reed canarygrass (Phalaris arundinacea) 100 Y FACW 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 100 = Total Cover Woody Vine Stratum (Plot size: ) 1. 2. = Total Cover % Bare Ground in Herb Stratum Dominance Test worksheet: Number of Dominant Species That Are OBL, FACW, or FAC: 1 (A) Total Number of Dominant Species Across All Strata: 1 (B) Percent of Dominant Species That Are OBL, FACW, or FAC: 100% (A/B) Prevalence Index worksheet: Total % Cover of: Multiply by: OBL species x 1 = FACW species x 2 = FAC species x 3 = FACU species x 4 = UPL species x 5 = Column Totals: (A) (B) Prevalence Index = B/A = Hydrophytic Vegetation Indicators: Rapid Test for Hydrophytic Vegetation Dominance Test is >50% Prevalence Index is ≤3.01 Morphological Adaptations1 (Provide supporting data in Remarks or on a separate sheet) Wetland Non-Vascular Plants1 Problematic Hydrophytic Vegetation1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic. Hydrophytic Vegetation Present? Yes No Remarks: US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0 SOIL Sampling Point: TP-A1 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 0-20" 10YR 3/1 Silt 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) Thick Dark Surface (A12) Redox Dark Surface (F6) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1) Depleted Dark Surface (F7) wetland hydrology must be present, Sandy Gleyed Matrix (S4) Redox Depressions (F8) unless disturbed or problematic. Restrictive Layer (if present): Type:________________________________ Depth (inches):________________________ Hydric Soil Present? Yes No Remarks: 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) (except MLRA Water-Stained Leaves (B9) (MLRA 1, 2, High Water Table (A2) 1, 2, 4A, and 4B) 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 Stressed 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): Water Table Present? Yes No Depth (inches): Saturation Present? Yes No Depth (inches): (includes capillary fringe) Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0 WETLAND DETERMINATION DATA FORM – Western Mountains, Valleys, and Coast Region Project/Site: Grove Road City/County: Thurston County Sampling Date:29 June 2022 Applicant/Owner: Grove Road State: WA Sampling Point: TP-A2 Investigator(s): Curtis Wambach Section, Township, Range: Landform (hillslope, terrace, etc.): Local relief (concave, convex, none): Slope (%): Subregion (LRR): Lat: Long: Datum: Soil Map Unit Name: NWI classification: Are climatic / hydrologic conditions on the site typical for this time of year? Yes No (If no, explain in Remarks.) Are Vegetation no, Soil no, or Hydrology no significantly disturbed? Are “Normal Circumstances” present? Yes No Are Vegetation no, Soil no, or Hydrology no 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 Hydric Soil Present? Yes No Wetland Hydrology Present? Yes No Is the Sampled Area within a Wetland? Yes No Remarks: VEGETATION – Use scientific names of plants. Absolute Dominant Indicator Tree Stratum (Plot size: 20') % Cover Species? Status 1. 2. 3. 4. = Total Cover Sapling/Shrub Stratum (Plot size: 12') 1. 2. 3. 4. 5. = Total Cover Herb Stratum (Plot size: 6') 1. Red fescue (Festuca rubra) 60 Y FAC 2. Oxeye daisy (Leucanthemum vulgare) 50 Y FACU 3. Cleavers (Galium aparine) 25 N FACU 4. Saint John's wort (Hypericum perforatum) 15 N FACU 5. Sheppard's purses (Capsella bursa-pastoris) 10 N FACU 6. Evergreen blackberry (Rubus laciniatus) 5 N FACU 7. 8. 9. 10. 11. 165 = Total Cover Woody Vine Stratum (Plot size: ) 1. 2. = Total Cover % Bare Ground in Herb Stratum Dominance Test worksheet: Number of Dominant Species That Are OBL, FACW, or FAC: 1 (A) Total Number of Dominant Species Across All Strata: 2 (B) Percent of Dominant Species That Are OBL, FACW, or FAC: 50% (A/B) Prevalence Index worksheet: Total % Cover of: Multiply by: OBL species x 1 = FACW species x 2 = FAC species 60 x 3 = 180 FACU species 105 x 4 = 420 UPL species x 5 = Column Totals: 160 (A) 500 (B) Prevalence Index = B/A = 3.13 Hydrophytic Vegetation Indicators: Rapid Test for Hydrophytic Vegetation Dominance Test is >50% Prevalence Index is ≤3.01 Morphological Adaptations1 (Provide supporting data in Remarks or on a separate sheet) Wetland Non-Vascular Plants1 Problematic Hydrophytic Vegetation1 (Explain) 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic. Hydrophytic Vegetation Present? Yes No Remarks: US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0 SOIL Sampling Point: TP-A2 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 0-20" 10YR 2/2 Silt 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) Thick Dark Surface (A12) Redox Dark Surface (F6) 3Indicators of hydrophytic vegetation and Sandy Mucky Mineral (S1) Depleted Dark Surface (F7) wetland hydrology must be present, Sandy Gleyed Matrix (S4) Redox Depressions (F8) unless disturbed or problematic. Restrictive Layer (if present): Type:________________________________ Depth (inches):________________________ Hydric Soil Present? Yes No Remarks: 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) (except MLRA Water-Stained Leaves (B9) (MLRA 1, 2, High Water Table (A2) 1, 2, 4A, and 4B) 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 Stressed 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): Water Table Present? Yes No Depth (inches): Saturation Present? Yes No Depth (inches): (includes capillary fringe) Wetland Hydrology Present? Yes No Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: Grove Road Property Critical Areas Report Page 43 14 December 2022 APPENDIX K Wetland Rating Form Wetland name or number Wet A Name of wetland (or ID #): Date of site visit: 29-Jun-22 Rated by Trained by Ecology? Yes No Date of training Continual 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 M L 8 = H, H, M MHTotal 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 None of the above Coastal Lagoon Interdunal Value Score Based on Ratings 86519 H CHARACTERISTIC Category Estuarine Wetland of High Conservation Value Bog Mature Forest Old Growth Forest Depressional & Flats RATING SUMMARY – Western Washington List appropriate rating (H, M, L) HydrologicImproving Water Quality MSite Potential Landscape Potential Habitat H FUNCTION Wetland A Curtis Wambach Google Earth and Autodesk Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 1 WSDOT Adapted Form - March 2, 2015 Wetland name or number Wet A Maps and Figures required to answer questions correctly for Western Washington Depressional Wetlands Map of: Figure # Cowardin plant classes Figure 5 Hydroperiods Figure 5 Location of outlet (can be added to map of hydroperiods ) Figure 2 Boundary of area within 150 ft of the wetland (can be added to another figure ) Figure 6 Map of the contributing basin Figure 8 1 km Polygon: Area that extends 1 km from entire wetland edge - including polygons for accessible habitat and undisturbed habitat Screen capture of map of 303(d) listed waters in basin (from Ecology website) Appendix E Screen capture of list of TMDLs for WRIA in which unit is found (from web) Appendix F Riverine Wetlands Map of: Figure # Cowardin plant classes Hydroperiods Ponded depressions Boundary of area within 150 ft of the wetland (can be added to another figure ) Plant cover of trees, shrubs, and herbaceous plants Width of unit vs. width of stream (can be added to another figure ) Map of the contributing basin 1 km Polygon: Area that extends 1 km from entire wetland edge - including polygons for accessible habitat and undisturbed habitat Screen capture of map of 303(d) listed waters in basin (from Ecology website) Screen capture of list of TMDLs for WRIA in which unit is found (from web) Lake Fringe Wetlands Map of: Figure # Cowardin plant classes Plant cover of trees, shrubs, and herbaceous plants Boundary of area within 150 ft of the wetland (can be added to another figure ) 1 km Polygon: Area that extends 1 km from entire wetland edge - including polygons for accessible habitat and undisturbed habitat Screen capture of map of 303(d) listed waters in basin (from Ecology website) Screen capture of list of TMDLs for WRIA in which unit is found (from web) Slope Wetlands Map of: Figure # Cowardin plant classes Hydroperiods Plant cover of dense trees, shrubs, and herbaceous plants Plant cover of dense, rigid trees, shrubs, and herbaceous plants (can be added to another figure ) Boundary of area within 150 ft of the wetland (can be added to another figure ) 1 km Polygon: Area that extends 1 km from entire wetland edge - including polygons for accessible habitat and undisturbed habitat Screen capture of map of 303(d) listed waters in basin (from Ecology website) Screen capture of list of TMDLs for WRIA in which unit is found (from web) To answer questions: D 1.3, H 1.1, H 1.4 D 1.4, H 1.2 D 1.1, D 4.1 D 2.2, D 5.2 D 4.3, D 5.3 H 2.1, H 2.2, H 2.3 D 3.1, D 3.2 D 3.3 To answer questions: H 1.1, H 1.4 H 1.2 R 1.1 R 2.4 R 1.2, R 4.2 R 4.1 R 2.2, R 2.3, R 5.2 H 2.1, H 2.2, H 2.3 L 1.2 L 2.2 L 3.1, L 3.2 L 3.3 H 2.1, H 2.2, H 2.3 R 3.1 R 3.2, R 3.3 To answer questions: L 1.1, L 4.1, H 1.1, H 1.4 S 3.1, S 3.2 S 3.3 S 4.1 S 2.1, S 5.1 To answer questions: H 1.1, H 1.4 H 1.2 S 1.3 H 2.1, H 2.2, H 2.3 Figure 7 Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 2 WSDOT Adapted Form - March 2, 2015 Wetland name or number Wet A For questions 1 -7, the criteria described must apply to the entire unit being rated. 1. Are the water levels in the entire unit usually controlled by tides except during floods? NO - go to 2 YES - the wetland class is Tidal Fringe - go to 1.1 1.1 Is the salinity of the water during periods of annual low flow below 0.5 ppt (parts per thousand)? NO - Saltwater Tidal Fringe (Estuarine)YES - Freshwater Tidal Fringe NO - go to 3 YES - The wetland class is Flats If your wetland can be classified as a Flats wetland, use the form for Depressional wetlands. 3. Does the entire wetland unit meet all of the following criteria? NO - go to 4 YES - The wetland class is Lake Fringe (Lacustrine Fringe) 4. Does the entire wetland unit meet all of the following criteria? The wetland is on a slope (slope can be very gradual ), The water leaves the wetland without being impounded. NO - go to 5 YES - The wetland class is Slope 5. Does the entire wetland unit meet all of the following criteria? The overbank flooding occurs at least once every 2 years. NO - go to 6 YES - The wetland class is Riverine NOTE: The Riverine unit can contain depressions that are filled with water when the river is not flooding. If hydrologic criteria listed in each question do not apply to the entire unit being rated, you probably have a unit with multiple HGM classes. In this case, identify which hydrologic criteria in questions 1 - 7 apply, and go to Question 8. At least 30% of the open water area is deeper than 6.6 ft (2 m). HGM Classification of Wetland in Western Washington If your wetland can be classified as a Freshwater Tidal Fringe use the forms for Riverine wetlands. If it is Saltwater Tidal Fringe it is an Estuarine wetland and is not scored. This method cannot be used to score functions for estuarine wetlands. The vegetated part of the wetland is on the shores of a body of permanent open water (without any plants on the surface at any time of the year) at least 20 ac (8 ha) in size; The water flows through the wetland in one direction (unidirectional) and usually comes from seeps. It may flow subsurface, as sheetflow, or in a swale without distinct banks. NOTE: Surface water does not pond in these type of wetlands except occasionally in very small and shallow depressions or behind hummocks (depressions are usually <3 ft diameter and less than 1 ft deep). The unit is in a valley, or stream channel, where it gets inundated by overbank flooding from that stream or river, 2. The entire wetland unit is flat and precipitation is the only source (>90%) of water to it. Groundwater and surface water runoff are NOT sources of water to the unit. Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 3 WSDOT Adapted Form - March 2, 2015 Wetland name or number Wet A NO - go to 7 YES - The wetland class is Depressional NO - go to 8 YES - The wetland class is Depressional NOTES and FIELD OBSERVATIONS: slope + depressional = depressional 7. Is the entire wetland unit located in a very flat area with no obvious depression and no overbank flooding? The unit does not pond surface water more than a few inches. The unit seems to be maintained by high groundwater in the area. The wetland may be ditched, but has no obvious natural outlet. 8. Your wetland unit seems to be difficult to classify and probably contains several different HGM classes. For example, seeps at the base of a slope may grade into a riverine floodplain, or a small stream within a Depressional wetland has a zone of flooding along its sides. GO BACK AND IDENTIFY WHICH OF THE HYDROLOGIC REGIMES DESCRIBED IN QUESTIONS 1-7 APPLY TO DIFFERENT AREAS IN THE UNIT (make a rough sketch to help you decide). Use the following table to identify the appropriate class to use for the rating system if you have several HGM classes present within the wetland unit being scored. 6. Is the entire wetland unit in a topographic depression in which water ponds, or is saturated to the surface, at some time during the year? This means that any outlet, if present, is higher than the interior of the wetland. Riverine Treat as ESTUARINE Slope + Lake Fringe Depressional + Riverine along stream within boundary of depression Depressional + Lake Fringe Riverine + Lake Fringe NOTE: Use this table only if the class that is recommended in the second column represents 10% or more of the total area of the wetland unit being rated. If the area of the HGM class listed in column 2 is less than 10% of the unit; classify the wetland using the class that represents more than 90% of the total area. HGM classes within the wetland unit being rated Slope + Riverine Slope + Depressional Depressional Depressional If you are still unable to determine which of the above criteria apply to your wetland, or if you have more than 2 HGM classes within a wetland boundary, classify the wetland as Depressional for the rating. Salt Water Tidal Fringe and any other class of freshwater wetland HGM class to use in rating Riverine Depressional Lake Fringe Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 4 WSDOT Adapted Form - March 2, 2015 Wetland name or number Wet 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 8 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 1 Source Yes = 1 No = 0 Total for D 2 Add the points in the boxes above 3 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 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 DEPRESSIONAL AND FLATS WETLANDS 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? 1 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. 2 D 2.0. Does the landscape have the potential to support the water quality function of the site? Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 5 WSDOT Adapted Form - March 2, 2015 Wetland name or number Wet 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 3 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 2 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 2 Rating of Value If score is: 2 - 4 = H 1 = M 0 = L Record the rating on the first page 1 0 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 2 0 3 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? 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? 0 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? 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. DEPRESSIONAL AND FLATS WETLANDS Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 6 WSDOT Adapted Form - March 2, 2015 Wetland name or number Wet 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 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. 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. Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 7 WSDOT Adapted Form - March 2, 2015 Wetland name or number Wet A H 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 + ( 1 % moderate & low intensity land uses / 2 ) = 0.5% 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: 4.2 % undisturbed habitat + ( 43.1 % moderate & low intensity land uses / 2 ) = 25.75% 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 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 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 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 ) 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) Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 8 WSDOT Adapted Form - March 2, 2015 Wetland name or number Wet 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. 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. 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. http://wdfw.wa.gov/publications/00165/wdfw00165.pdf or access the list from here: http://wdfw.wa.gov/conservation/phs/list/ Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 9 WSDOT Adapted Form - March 2, 2015 Wetland name or number Wet A Wetland Type Category Check off any criteria that apply to the wetland. List the category when the appropriate criteria are met. SC 1.0. Estuarine Wetlands Does the wetland meet the following criteria for Estuarine wetlands? The dominant water regime is tidal, Vegetated, and With a salinity greater than 0.5 ppt Yes - Go to SC 1.1 No = Not an estuarine wetland SC 1.1. Yes = Category I No - Go to SC 1.2 SC 1.2.Is the wetland unit at least 1 ac in size and meets at least two of the following three conditions? Yes = Category I No = Category II SC 2.0. Wetlands of High Conservation Value (WHCV) SC 2.1. Yes - Go to SC 2.2 No - Go to SC 2.3 SC 2.2. Is the wetland listed on the WDNR database as a Wetland of High Conservation Value? Yes = Category I No = Not WHCV SC 2.3. Is the wetland in a Section/Township/Range that contains a Natural Heritage wetland? http://www1.dnr.wa.gov/nhp/refdesk/datasearch/wnhpwetlands.pdf Yes - Contact WNHP/WDNR and to SC 2.4 No = Not WHCV SC 2.4. Yes = Category I No = Not WHCV SC 3.0. Bogs SC 3.1. Yes - Go to SC 3.3 No - Go to SC 3.2 SC 3.2. Yes - Go to SC 3.3 No = Is not a bog SC 3.3. Yes = Is a Category I bog No - Go to SC 3.4 SC 3.4. Yes = Is a Category I bog No = Is not a bog NOTE: If you are uncertain about the extent of mosses in the understory, you may substitute that criterion by measuring the pH of the water that seeps into a hole dug at least 16 in deep. If the pH is less than 5.0 and the plant species in Table 4 are present, the wetland is a bog. Is an area with peats or mucks forested (> 30% cover) with Sitka spruce, subalpine fir, western red cedar, western hemlock, lodgepole pine, quaking aspen, Engelmann spruce, or western white pine, AND any of the species (or combination of species) listed in Table 4 provide more than 30% of the cover under the canopy? CATEGORIZATION BASED ON SPECIAL CHARACTERISTICS Is the wetland within a National Wildlife Refuge, National Park, National Estuary Reserve, Natural Area Preserve, State Park or Educational, Environmental, or Scientific Reserve designated under WAC 332-30-151? The wetland is relatively undisturbed (has no diking, ditching, filling, cultivation, grazing, and has less than 10% cover of non-native plant species. (If non-native species are Spartina , see page 25) At least ¾ of the landward edge of the wetland has a 100 ft buffer of shrub, forest, or un- grazed or un-mowed grassland. The wetland has at least two of the following features: tidal channels, depressions with open water, or contiguous freshwater wetlands. Has WDNR identified the wetland within the S/T/R as a Wetland of High Conservation Value and listed it on their website? Has the WA Department of Natural Resources updated their website to include the list of Wetlands of High Conservation Value? Does the wetland (or any part of the unit) meet both the criteria for soils and vegetation in bogs? Use the key below. If you answer YES you will still need to rate the wetland based on its functions . Does an area within the wetland unit have organic soil horizons, either peats or mucks, that compose 16 in or more of the first 32 in of the soil profile? Does an area within the wetland unit have organic soils, either peats or mucks, that are less than 16 in deep over bedrock, or an impermeable hardpan such as clay or volcanic ash, or that are floating on top of a lake or pond? Does an area with peats or mucks have more than 70% cover of mosses at ground level, AND at least a 30% cover of plant species listed in Table 4? Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 10 WSDOT Adapted Form - March 2, 2015 Wetland name or number Wet A SC 4.0. Forested Wetlands Yes = Category I No = Not a forested wetland for this section SC 5.0. Wetlands in Coastal Lagoons Does the wetland meet all of the following criteria of a wetland in a coastal lagoon? Yes - Go to SC 5.1 No = Not a wetland in a coastal lagoon SC 5.1. Does the wetland meet all of the following three conditions? The wetland is larger than 1/10 ac (4350 ft2) Yes = Category I No = Category II SC 6.0. Interdunal Wetlands In practical terms that means the following geographic areas: Long Beach Peninsula: Lands west of SR 103 Grayland-Westport: Lands west of SR 105 Ocean Shores-Copalis: Lands west of SR 115 and SR 109 Yes - Go to SC 6.1 No = Not an interdunal wetland for rating SC 6.1. Yes = Category I No - Go to SC 6.2 SC 6.2. Is the wetland 1 ac or larger, or is it in a mosaic of wetlands that is 1 ac or larger? Yes = Category II No - Go to SC 6.3 SC 6.3. Yes = Category III No = Category IV Category of wetland based on Special Characteristics If you answered No for all types, enter “Not Applicable” on Summary Form The wetland is relatively undisturbed (has no diking, ditching, filling, cultivation, grazing), and has less than 20% cover of aggressive, opportunistic plant species (see list of species on p. 100). At least ¾ of the landward edge of the wetland has a 100 ft buffer of shrub, forest, or un- grazed or un-mowed grassland. Is the wetland west of the 1889 line (also called the Western Boundary of Upland Ownership or WBUO)? If you answer yes you will still need to rate the wetland based on its habitat functions. Is the wetland 1 ac or larger and scores an 8 or 9 for the habitat functions on the form (rates H,H,H or H,H,M for the three aspects of function)? Is the unit between 0.1 and 1 ac, or is it in a mosaic of wetlands that is between 0.1 and 1 ac? The wetland lies in a depression adjacent to marine waters that is wholly or partially separated from marine waters by sandbanks, gravel banks, shingle, or, less frequently, rocks The lagoon in which the wetland is located contains ponded water that is saline or brackish (> 0.5 ppt) during most of the year in at least a portion of the lagoon (needs to be measured near the bottom ) Does the wetland have at least 1 contiguous acre of forest that meets one of these criteria for the WA Department of Fish and Wildlife’s forests as priority habitats? If you answer YES you will still need to rate the wetland based on its functions. Old-growth forests (west of Cascade crest): Stands of at least two tree species, forming a multi-layered canopy with occasional small openings; with at least 8 trees/ac (20 trees/ha) that are at least 200 years of age OR have a diameter at breast height (dbh) of 32 in (81 cm) or more. Mature forests (west of the Cascade Crest): Stands where the largest trees are 80- 200 years old OR the species that make up the canopy have an average diameter (dbh) exceeding 21 in (53 cm). Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 11 WSDOT Adapted Form - March 2, 2015 Grove Road Property Critical Areas Report Page 44 14 December 2022 APPENDIX L City of Yelm Frequently Flooded Areas Grove Road Property Critical Areas Report Page 45 14 December 2022 Grove Road Property Critical Areas Report Page 46 14 December 2022 APPENDIX M City of Yelm Critical Aquafer Recharge Areas Grove Road Property Critical Areas Report Page 47 14 December 2022 Grove Road Property Critical Areas Report Page 48 14 December 2022 APPENDIX N City of Yelm Wetlands Grove Road Property Critical Areas Report Page 49 14 December 2022