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I <br /> Soils Information <br /> Informa i n <br /> IThe following soils information is copied from a scanned version of the text of the original Soil <br /> Survey report of Snohomish County Area, Washington issued July 1983. <br /> I This information is available from the NRCS Washington state web site <br /> www.wa.nrcs.usda.gov/index.html <br /> 1 <br /> 5-Alderwood-Urban land complex,2 to 8 depth of about 35 inches. Depth to the hardpan <br /> percent slopes.This map unit is on till plains. ranges from 20 to 40 inches. <br /> I <br /> Areas are irregular in shape and are 100 to 1,000 Permeability of the Alderwood soil is <br /> acres in size. The native vegetation is mainly moderately rapid above the hardpan and very slow <br /> conifers. Elevation is 50 to 550 feet.The average through it.Available water capacity is low. Effective <br /> annual precipitation is about 40 inches,the rooting depth is 20 to 40 inches. Runoff is slow, <br /> I average annual air temperature is about 50 and the hazard of water erosion is slight. A <br /> degrees F, and the average frost-free season is seasonal perched water table is at a depth of 18 <br /> 170 to 190 days. to 36 inches from January to March. <br /> 1 This unit is about 60 percent Alderwood Urban land is areas that are covered by <br /> gravelly sandy loam and about 25 percent Urban streets, buildings, parking lots, and other structures <br /> land. The components of this unit are so intricately that obscure or alter the soils so that identification <br /> intermingled that it was not practical to map them is not possible. <br /> I <br /> separately at the scale used. The Alderwood soil in this unit is used mainly <br /> Included in this unit are small areas of for parks, building sites, lawns, gardens, and <br /> McKenna and Norma soils and Terric Medisaprists woodland. <br /> in depressional areas and drainageways on plains. The main limitations of the Alderwood soil for <br /> I Also included are small areas of soils that are very homesites and septic tank absorption fields are the <br /> shallow over a hardpan; small areas of Everett, depth to the hardpan and the seasonal perched <br /> Indianola, and Ragnar soils on terraces and water table. Onsite waste disposal systems often <br /> I <br /> outwash plains; and soils that have a stony and fail or do not function properly during periods of <br /> bouldery surface layer. Included areas make up high rainfall. Drainage is needed if buildings with <br /> about 15 percent of the total acreage. basements and crawl spaces are constructed. <br /> The Alderwood soil is moderately deep over a Topsoil needs to be stockpiled during site <br /> I <br /> hardpan and is moderately well drained. It formed preparation and subsequently used to cover the <br /> in glacial till. Typically, the surface layer is very exposed material. Additions of fertilizer and peat <br /> dark grayish brown gravelly sandy loam about 7 are desirable prior to seeding grass for lawns. <br /> inches thick. The upper part of the subsoil is dark This map unit is in capability subclass IVe. <br /> I <br /> yellowish brown and dark brown very gravelly <br /> sandy loam about 23 inches thick. The lower part is <br /> olive brown very gravelly sandy loam about 5 <br /> inches thick. A weakly cemented hardpan is at a <br /> 1 <br /> 1 <br /> I <br /> I <br /> I <br />