7702 RAINIER DR 2022-04-05 - Laserfiche WebLink

• and outwash plains, and Norma soils and Terric medisaprists in depressional areas and on outwash plains and till plains. Included areas make up about 15 percent of the total acreage. McKenna soils are included on the Washington State Hydric Soils List. The NRCS describes Alderwood-Urban land, 0 to 8 percent slopes as being comprised of about 60 percent Alderwood gravelly sandy loam and about 25 percent urban land. Included in this unit are small areas of McKenna and Norma soils and Terric Medisaprists in depressional areas and drainageways on plains. Also included are small areas of soils that are very shallow over a hardpan; small areas of Everett, Indianola, and Ragnar soils on terraces and outwash plains; and soils that have a stony and bouldery surface layer. Included areas make up about 15 percent of the total acreage. The Alderwood soil is moderately deep over a hardpan and is moderately well drained. It formed in glacial till. Typically the surface layer is very dark grayish brown gravelly sandy loam about 7 inches thick.The upper part of the subsoil is dark yellowish brown and dark brown very gravelly sandy loam about 23 inches thick. A weakly cemented hardpan is at a depth of about 35 inches. Permeability of this soil is moderately rapid above the hardpan and very slow through it.Available water capacity is low. BUILDING SETBACKS Pursuant to EMC 37.110(A)(7) and 37.170(A)(4), To maintain the integrity of the buffer, buildings and other structures shall be set back a minimum of ten feet from the edges of all wetland and stream buffer boundaries. EXISTING FUNCTIONS AND VALUES The methodologies for this functions and values assessment is based on professional opinion developed through past field analyses and interpretation. This assessment pertains specifically to the on-site wetland, stream, and associated buffer but is typical for assessments of similar systems common to western Washington. The three main functions provided by wetlands include water quality, stormwater / hydrologic control, and wildlife habitat. Buffers serve to protect and support the functions of wetlands and streams as well as provide their own wildlife habitat,water quality, and erosion control functions. Overall, the subject wetland and associated on-site buffer provide a low level of functions and values. This hydrogeomorphic class slope wetland has a limited ability to retain stormwater. Due to the nature of slopes wetlands, rather than being stored in these wetlands, water is typically released relatively quickly to downstream systems. Therefore, the subject wetland provides limited stormwater storage functions. Acre Environmental Consulting, LLC October 29,2015 CAS&Buffer Mitigation Plan for—Kymera Inc.-7702 Rainier Drive Everett,WA Page 7