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Home My WebLink AboutWetland Determination - PLN General - 10/28/2019 612 Woodland Square Loop SE,Suite 100 Lacey,WA 98503 360.292.7230 kpff.corn Technical Memorandum RECENE® Te pZ Date: September 24, 2019 OCT 2 8 2019 41V� / To: Jeremy Francis, Mason County 615 W. Alder Street 410 From: Larry Dominguez,MES,Senior Ecologist; Brianna Hines, MES,WPIT, Biologist RE: Wetland Delineation and Rating, Parcels 519207500020 and 519207500010, Mason County,WA 1.0 Introduction Mr. Francis hired KPFF to perform a wetland assessment and delineation on two parcels. Mr. Francis is seeking to construct a single-family residence and under Mason County Critical Areas ordinance is required to have potentially affected wetlands delineated and characterized to determine buffer distance requirements. The buffer setbacks inform structure siting and development footprint. 2.0 Methods A KPFF staff biologist performed a wetland delineation and rating on September 18, 2019. Per Mason County requirements the wetland was delineated using the recommended US Army Corps of Engineers delineation protocols and rated using the Washington State Department of Ecology rating protocols. The wetland to the north of the property was not delineated in entirety, as the client only needed to confirm the wetland boundary closest to his property for site. A Depressional Rating form was used for the wetland classification. 3.0 Summary of Regulatory Issues Mason County regulates development in order to protect natural resources, such as wetlands. Mason County municipal code 8.52.110 outlines the regulations and requirements when developing land near/adjacent to wetlands. Mason County recognizes the following table of wetland categories to determine the required wetland buffer widths: 1) Category I Wetlands. Category I wetlands are those regulated wetlands that include but are not limited to rare, unique wetland types that are more sensitive to disturbance than most wetlands and that contain ecological attributes that are impossible to replace within a human lifetime. Category I wetlands score between 23-27 points on the wetlands ratings systems. 2)Category II Wetlands. Category II wetlands are those regulated wetlands that score between 20-22 points on the wetlands ratings system. 3) Category III Wetlands. Category III wetlands are those regulated wetlands that score between 16-19 points on the wetlands ratings system. 4) Category IV Wetlands. Category IV wetlands are those regulated wetlands that score between 9-15 points on the wetlands ratings system. 5)Wetlands intentionally created from non-wetland areas to mitigate conversion of other wetlands. 6) Mosaic wetlands as defined in Section 8.52.030 `Mason County non-Regulated Wetlands. Isolated wetlands under 1,000 square feet which are not associated with a riparian corridor or a shoreline of the state, not part of a wetland mosaic, and not essential habitat of a priority species as identified by the Washington Department of Fish and Wildlife. ' h r September 24, 2019 Page 2 Mason County also regulates buffer requirements depending on the subject wetland Category and the land use impact rating (MCMC 8.52.110(B)). Mason County does allow for buffer width averaging or buffer reduction if all criteria listed in MCMC 8.52.110 E2a is met. 4.0 Wetland Type Determination KPFF staff biologist determined the wetland adjacent to the applicants parcel to be a Category III Depressional Wetland. The wetland scored a total of 17 points with the following point distribution: Parameter Wetland Potential Low-Medium Potential Intermittently flowing stream Water Quality High area of persistent, ungrazed plants Wetland is in basin identified as important for maintaining water quality Low-Medium Potential Hydrological Doesn't receive stormwater discharges Minimal depth of storage during wet periods Intermittently flowing stream Medium-High Potential Multiple Cowardin classes Habitat Special habitat features(LWD, minimal invasive plants) Accessible, undisturbed habitat Contains priority habitats within 100m 5.0 Habitat Description The applicant parcel is located in a Douglas fir(Pseudotsuga menziesh) dominated forest. Cloquallum Creek creates the southern border of the parcel and then flows south to north through the west end of the parcel. Soils are clay loam with glacial outwash particles. Dominant species in the tree stratum were Douglas fir(Pseudotsuga menziesii)and Red alder(Alnus rubra). The dominant species in the shrub stratum were Red-osier dogwood (Corpus siricea) and salmonberry(Rubus spectabilis). According to the National Wetland Inventory map (Service, 2019), there was a project Palustrine Scrub/Shrub Forested Wetland along Cloquallum Creek both to the south and the west. However, during the site visit KPFF staff biologist confirmed that there is only a wetland located in the parcel to the north of the applicant, adjacent to Cloquallum Creek(Please see Map 1). 6.0 Regulatory Determination and Recommendation The proposed construction is a single-family home on approximately 6 acres in Elma,WA. Mason County classifies this type of development as"moderate" impact. Following the site visit, KPFF staff biologist classified the wetland as a Category III Depressional Wetland. Table 8.52.110 D of Mason County municipal code was used to determine the buffer requirements for this project. However, upon further examination the listed table does not account for Category III wetlands scoring higher than 7 in the habitat section of the rating form. As such,we are defaulting to the buffer width for those Category III wetlands with moderate level of function for habitat(score 5-7 points) and moderate land use impact, which requires a 110-foot buffer. Mason County also requires a 15-foot setback for all wetland buffers, which brings the total required buffer for this wetland to 125 feet. The structure that is proposed to be closest to the wetland buffer is the applicant's new garage of the home. Based on the low slope and dense vegetation between the proposed garage siting and the wetland boundary, there is likely little to no impact on the wetland should the area remain vegetated. Conditions appear that overland flow will be readily absorbed by forest duff, ground cover, and shrubs. ti APPENDIX Attachments z z < a.' Ft, w e #� X r 6 ale,xym"c ,a , Ji x ,t !p!:at,cel,#51519207500020 w a� Parcel#51519207500010 - - ' s W mmun ➢igi be, o tar Jeremy Francis Wetland Delineation Wetland Buffer and Required Setback(125ft) project # 10181900103 -' Southern Wetland Boundary lTff (__- Pa`cefs Delineated portion of wetland boundary nearest to proposed development(shown here in green). The 125ft buffer width according to Mason County code is shown in yellow. National Wetlands Inventor U.S.Fish a Kt Wildlife Service Frances Delineation NWI Map n .a k 1:7,218 0 0.05 0.1 0.2 mi 0 0.075 0.15 0.3 km This map is for general reference only.The US Fish and Wildlife September 16,2019 Service is not responsible for the accuracy or currentness of the ® base data shown on this map.All wetlands related data should Lake Wetlands ❑ Freshwater Emergent Wetland be used in accordance with the layer metadata found on the Wetlands Mapper web site. Estuarine and Marine Deepwater Freshwater Forested/Shrub Wetland Other Estuarine and Marine Wetland Freshwater Pond Riverine tJational Wetlands Inventory(NWI) This page was produced by the MM mapper 3 3 Soil Map—Mason County,Washington IR (Frances Delineation Soil Map) k 4 14o a 4r 741-N q r� k , 4r—N 4r 7 z N - xr- 4749M 4750M _. 475OB0 475140 475XID n 474sm 47472D 474M 474840 a74900 3 3 6. m Map Sole:1:2,58o E p vied on A latld5ol)e(If x 8.5')sheet MetefS N N o 35 70 110 210 Ao too 200 400 Feet Map l> :.Me calm Conn ol.siates:WGS84 Edge tics:UrM Zone 10N W684 Web Soil Survey 9/16/2019 1 st>N Natural Resources Page 1 of 3 Conservation Service National Cooperative Soil Survey Soil Map--Mason County,Washington (Frances Delineation Soil Map) MAP LEGEND MAP INFORMATION Area of Interest(AOq Spoil Area The soil surveys that comprise your AOI were mapped at Area of Interest(AOI) Stony Spo 1:31,700. t Soils very Stony Spot Warning:Soil Map may not be valid at this scale. Soil Map Unit Polygons Enlargement of maps beyond the scale of mapping can cause - Wet Spot . , Soil Map unit Lines misunderstanding of the detail of mapping and accuracy of soil Other line placement.The maps do not show the small areas of Soil Map unit Points contrasting soils that could have been shown at a more detailed Special Line Features scale Special Point Features Blowout Water Features Streams and Canals Please rely on the bar scale on each map sheet for map Borrow Pit measurements. Transportation Clay Spot Rails Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Closed Depression Interstate Highways Coordinate System: Web Mercator(EPSG:3857) Gravel Pit US Routes Maps from the Web Soil Survey are based on the Web Mercator Gravely Spot Major Roads projection,which preserves direction and shape but distorts distance and area.A projection that preserves area,such as the Landfill Local Roads Albers equal-area conic projection,should be used if more accurate calculations of distance or area are required. Lava Flow Background Marsh or swamp Aerial Photography of product is generated from the USDA-MRCS certified data as of the version date(s)listed below. Mine or Quarry Soil Survey Area: Mason County,Washington Miscellaneous Water Survey Area Data: Version 14,Sep 10,2018 Perennial Water Soil map units are labeled(as space allows)for map scales 1:50,000 or larger. Rock Outcrop Date(s)aerial images were photographed: Jun 15,2015--Sep Saline Spot 29,2016 Sandy Spot The orthophoto or other base map on which the soil lines were Severely Eroded Spot compiled and digitized probably differs from the background imagery displayed on these maps.As a result,some minor Sinkhole shifting of map unit boundaries may be evident. Slide or Slip Sodic Spot Web Soil Survey 9/1 612 01 9 st>a Natural Resources Page 2 of 3 Conservation Service National Cooperative Soil Survey Soil Map—Mason County,Washington Frances Delineation Soil Map Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI Af Astoria sift loam,15 to 30 1.9 6.0% percent slopes Gg Grove gravelly loam,basin 7.2 23.0% phase,0 to 5 percent slopes Gh Grove gravelly sandy loam,0 5.5 17.6% to 5 percent slopes Hm Hoquiam gravelly silt loam,15 8.5 27.0% to 30 percent slopes Mb I Maytown silt loam,0 to 3 8.3 26.4% percent slopes Totals for Area of Interest _ 31.3 100.0% 9/16/2019 Ljspq Natural Resources Web Soil Survey aM Conservation Service National Cooperative Soil Survey Page 3 of 3 WDFW Test Map 4. i 1 A 1:19,842 September 16,2019 0 0.15 0.3 0.6 ml PHS Report Clip Area POLY QTR-TWP 0 0.275 0.55 1.1 km n PT AS MAPPED TOWNSHIP Source - Diyanlobe,GmEye,Eadhsar Geographies,CNESIA m OS,USDA USGS,AeroGFL D,IGN,and lire GIS UserCommuni - LN SECTION WASHINGTON DEPARTMENT OF FISH AND WILDLIFE PRIORITY HABITATS AND SPECIES REPORT SOURCE DATASET: PHSPlusPublic Query ID: P190916155414 REPORT DATE: 09/16/2019 3.54 Common Name Site Name Priority Area Accuracy Federal Status Sensitive Data Source Entity Scientific Name Source Dataset Occurrence Type State Status Resolution Geometry Type Source Record More Information(LIRL) PHS Listing Status Notes Source Date Mgmt Recommendations Chum Cloquallum Creek Occurrence NA Not Warranted N WDFW Fish Program Onoorhynchus keta SASI Occurrence N/A AS MAPPED Lines 2671 http://wdfw.wa.govtwim/diversty/sWsoc.htm http:/twdfw.wa.govipublicabons/pub.php? PHS Listed Coho Breeding Area NA N/A N Oncorhynchus kisutch SWIFD Breeding area N/A AS MAPPED Lines 58586 http:/twdfw.wa.govtwim/diversty/soctsoc.htm http:/twdtw.wa.govipublirabon/pub.php? PHS LISTED Coho Cloquallum Creek Breeding Area NA N/A N Onoorhynchus kisutch SWIFD Breeding area N/A AS MAPPED Lines 58905 http:/hvdfw.wa.govtwim/diversty/sWsoc.htm http://wdfw.wa.govipubiicationstpub.php? PHS LISTED Coho Occurrence NA Candidate N WDFW Fish Program Oncorhynchus kisutch SASI Occurrence N/A AS MAPPED Lines 3605 http://wdfw.wa.govANIm/diversty/soGsoc.htm http:/Avdfw.wa.gov/publications/pub.php? PHS Listed Coho Cloquallum Creek Occurrence NA Candidate N WDFW Fish Program Oncorhynchus kisutch SASI Occurrence N/A AS MAPPED Lines 3605 http://wdfw.wa.govtMm/diversty/soctsoc.htm http://wdfw.wa.gov/publicationstpub.php? PHS Listed Cutthroat Occurrence NA Candidate N WDFW Fish Program Oncorhynchus clarki SASI Occurrence N/A AS MAPPED Lines 7580 http:/twdfw.wa.gov/wlm/diversty/soctsoc.htm http://wdfw.wa.gov/publications/pub.php? PHS Listed Cutthroat Cloquallum Creek Occurrence NA Candidate N WDFW Fish Program Oncorhynchus clarki SASI Occurrence N/A AS MAPPED Lines 7580 http://wdfw.wa.govtwim/diversty/soctsoc.htm http://wdfw.wa.gov/publicationstpub.php? PHS Listed 09/16/2019 3.54 1 r _ Common Name Site Name Priority Area Accuracy Federal Status Sensitive Data Source Entity Scientific Name Source Dataset Occurrence Type State Status Resolution Geometry Type Source Record More Information(URL) PHS Listing Status Notes Source Date Mgmt Recommendations Fall Chinook Cloquallum Creek Occurrence/Migration NA N/A N Oncorhynchus tshawytscha SWIFD Occurrence/migration N/A AS MAPPED Lines 58901 http:/twdfw.wa.gov/wlm/diverstylsoctsoc.htrn http:ltwdfw.wa.gov/publications/pub.php? PHS LISTED Fall Chum Cloquallum Creek Breeding Area NA N/A N Oncorhynchus keta SWIFD Breeding area NIA AS MAPPED Lines 58903 http://wdfw.wa.gov/wimidiversty/soc/soc.htm http://wdtw.wa.gov/publications/pub.php? PHS LISTED Freshwater Forested/Shrub N/A Aquatic Habitat NA N/A N US Fish and Wildlife Service NWIWetlands Aquatic habitat N/A AS MAPPED Polygons http://www.ecy.wa. PHS Listed Freshwater Forested/Shrub N/A Aquatic Habitat NA NIA N US Fish and Wildlife Service NWIWetlands Aquatic habitat N/A AS MAPPED Polygons http://www.ecy.wa. PHS Listed Rainbow Trout Occurrence/Migrabon NA N/A N Oncorhynchus mykiss SWIFD Occurrence/migration N/A AS MAPPED Lines 58587 http:/hvdfw.wa.govtwim/diversty/sOc/soc.— _ http://wdfw.wa.gov/publicabonslpub.php? PHS LISTED Rainbow Trout Cloquallum Creek Occurrence/Migration NA NIA N Oncorhynchus mykiss SWIFD Occurrence/migration N/A AS MAPPED Lines 58907 http://wdfw.wa.govhvlm/diverstylsoclsoc.htm http:/twdfw.wa.gov/publications/pub.php? PHS LISTED Resident Coastal Cutthroat Occurrence/Migration NA N/A N Oncorhynchus clarki SWIFD Occurrence/migration N/A AS MAPPED Lines 58584 http://wdfw.wa.gov/wlm/diversty/Soctsoc.htm http:/twdfw.wa.gov/Publicafions(pub.php? PHS LISTED Resident Coastal Cutthroat Cloquallum Creek Occurrence/Migration NA N/A N Oncorhynchus clarki SWIFD Occurrence/migration N/A AS MAPPED Lines 58900 http://wdfw.wa.govtMm/diversty/soctsoc.htm http:/wwdfw.wa.gov/publicabons/pub.php? PHS LISTED 2 09/16/2019 3.54 r ` Common Name Site Name Priority Area Accuracy Federal Status Sensitive Data Source Entity Scientific Name Source Dataset Occurrence Type State Status Resolution Geometry Type Source Record More Information(URL) PHS Listing Status Notes Source Date Mgmt Recommendations Steelhead Cloquallum Creek Occurrence NA Not Warranted N WDFW Fish Program Onoorhynchus mykiss SASI Occurrence N/A AS MAPPED Lines 6574 http:itwdfw.w8.90v/wim/diversty/soctsoc.htm http://wdfw.wa.gov/publications/pub.phP? PHS Listed Winter Steelhead Cloquallum Creek Breeding Area NA N/A N Oncorhynchus mykiss SWIFD Breeding area N/A AS MAPPED Lines 58908 http://wdfw.wa.govtwim/diversty/soctsoc.htm http://wdfw.wa.gov/publirationstpub.php? PHS LISTED DISCLAIMER. This report includes information that the Washington Department of Fish and Wildlife(WDFW)maintains in a central computer database. It is not an attempt to provide you with an official agency response as to the impacts of your project on fish and wildlife. This information only documents the location offish and wildlife resources to the best of our knowledge. It is not a complete inventory and it is important to note that fish and wildlife resources may occur in areas not currently known to WDFW biologists,or in areas for which comprehensive surveys have not been conducted. Site specific surveys are frequently necesssary to rule out the presence of priority resources. Locations of fish and wildlife resources are subject to vraition caused by disturbance,changes in season and weather,and otherfactors. WDFW does not recommend using reports more than six months old. 3 09/16/2019 3.54