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_... . is slight.A seasonal perched water table is at a depth of 18 The main limitations of the Alderwood soil for homesites
<br /> to 36 inches from January to March. and septic tank absorption fields are the depth to the
<br /> Urban land is areas that are covered by streets, hardpan and wetness because of the seasonal perched water
<br /> buildings, parking lots, and other structures that obscure table.Drainage is needed if buildings with basements and crawl
<br /> or alter the soils so that identification is not possible. spaces are constructed.Onsite sewage disposal systems
<br /> The Alderwood soil in this unit is used mainly for often fail or do not function properly during periods of high
<br /> parks, building sites,lawns,gardens, woodland. rainfall.Topsoil needs to be stockpiled during site preparation
<br /> The main limitations la s of the ens,Aldandoad soil for and subsequently used to cover the exposed underlying
<br /> material. Additions of fertilizer and peat are desirable
<br /> homesites and septic tank absorption fields are the depth prior to seeding grass for lawns.
<br /> to the hardpan and the seasonal perched water table. Onsite This map unit is in capability subclass IVe.
<br /> waste disposal systems often fail or do not function properly
<br /> during periods of high rainfall.Drainage is needed if buildings 7-Bellingham silty clay loam. This very deep,poorly
<br /> with basements and crawl spaces are constructed.Topsoil drained soil is in depressional areas. It formed in alluvium and
<br /> needs to be stockpiled during site preparation and lacustrine sediment.Areas are regular in shape and are about 2
<br /> subsequently used to cover the exposed material. to 25 acres in size. The native vegetation is mainly grass and
<br /> Additions of fertilizer and peat are desirable prior to seeding sedges,Elevation is 50 to 800 feet. Slope is 0 to 3 percent.
<br /> grass for lawns. The average annual precipitation is about 45 inches,the
<br /> This map unit is in capability subclass IVe. average annual air temperature is about 50 degrees F,and
<br /> the average frost-free season is 160 to 180 days.
<br /> 6-Alderwood-Urban land complex, 8 to 15 percent Typically, the surface layer is very dark gray silty clay
<br /> slopes.This map unit is on till plains,Areas are irregular in loam about 9 inches thick. The subsoil to a depth of 60
<br /> shape and are 25 to 100 acres in size.The native vegetation inches or more is mottled,gray and olive silty clay.
<br /> is mainly conifers and hardwoods.E vation is 50 to 550 feet. Included in this unit are small areas of Tern
<br /> Medisapnsts,
<br /> very poorly drained organic soils,Norma
<br /> The average annual precipitation is about 40 inches,the soils along upland
<br /> dra
<br /> ap
<br /> Pa
<br /> average annual air temperature is about 50 degrees F, and Bellinghamnaghs iilssth and have been soilson terraces, and
<br /> soils that drained. Included areas
<br /> the average frost-free season is 170 to 190 days. make up about 10 percent of the total acreage.
<br /> This unit is about 60 percent Alderwood gravelly sandy loam and Permeability of this Bellingham soil is slow. Available
<br /> about 25 percent Urban land.The components of this unit water capacity is high. Effective rooting depth is limited by a
<br /> are so intricately intermingled that it was not practical to map seasonal high water table that is at a depth of 0 to about
<br /> them separately at the scale used. 12 inches from November to June. Runoff is very slow,and
<br /> Included in this unit are small areas of Everett and the hazard of water erosion is slight. Ponding occurs from
<br /> Indianola soils on terraces and outwashains,Kitsap soils on
<br /> � November to June.
<br /> terraces and terrace escarpments,and Ragnar soils on This unit is used for pasture,woodland, urban
<br /> outwash plains. included areas make up about 15 percent development,and wildlife habitat.
<br /> of the total acreage. This unit is suited to pasture if the excess water on the
<br /> The Alderwood soil is moderately deep and moderately surface is removed.Tile drains or open ditches can be used if
<br /> well drained.It formed in glacial till.Typically,the surface layer is
<br /> very dark grayish brown gravelly sandy loam about 7 suitable outlets are available. Grazing when the soil in this
<br /> inches thick. The upper part of the subsoil is dark yellowish unit is wet results in compaction of the surface layer, poor
<br /> brown and dark brown very gravelly sandy loam about 23 tilth, and reduced infiltration.Use of proper stocking rates,
<br /> inches thick. The lower pasture rotation, and restricted grazing during wet periods
<br /> part is olive brown very gravelly sandy loam about 5 helps to keep the pasture in good condition. Proper grazing
<br /> inches thick.A weakly cemented hardpan is at a depth of practices,weed control,and fertilizer are needed for
<br /> about 35 inches. Depth to the hardpan ranges from 20 to maximum quality of forage.
<br /> 40 inches. This unit is suited to red alder. On the basis of a 50-year
<br /> Permeability of the Alderwood soil is moderately rapid site curve,the mean site index is 83. The mean annual
<br /> above the hardpan and very slow through it, Available increment at culmination (CMAI)for red alder at age 40 is
<br /> water capacity is low. Effective rooting depth is 20 to 40 89 cubic feet per acre.Among the trees of limited extent on
<br /> inches. Runoff is slow,and the hazard of water erosion is this unit are Douglas-fir, bigleaf maple,western redcedar,
<br /> hemlock.
<br /> slight, A seasonal perched water table is at a depth of 18 to and western are.Among the common forest
<br /> understory plants trailing blackberry,western
<br /> 36 inches from January to March. swordfern. thimbleberry, salmonberry, and huckleberry.
<br /> Urban land consists of areas that are covered by streets, The main limitation for the harvesting of timber is soil
<br /> buildings,parking lots,and other structures that obscure or alter wetness, which limits the use of equipment to dry
<br /> the soils so that identification is not possible,
<br /> The Alderwood soil in this unit is used mainly for
<br /> parks, building sites,lawns,and woodland.
<br />
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