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<br /> Snohomish County Area, Washington 13
<br /> It k
<br /> ir -,,
<br /> is slight.A seasonal perched water table is at a depth of The main limitations of the Aide ;a.i soil for
<br /> 1,. 18 to 36 inches from January to March. homnesites and septic tank .6. fields are the
<br /> 3; Urban land is areas that are covered by streets, depth to the hardpan and we€ _> because of tte
<br /> d f.. buildings,parking lots, and other structures that obscure seasonal perched water Y,a:- s_ - age is needed
<br /> if
<br /> or alter the soils so that identification is not possible. buildings with basements -- d crawl spaces are
<br /> The Alderwood soil in this unit is used mainly for constructed.Onsite - :a e disposal systems often fail
<br /> or do not fun ton a,.a a periodsrai ifel.
<br /> parks,building sites, lawns,gardens,and woodland duringhigh
<br /> The main limitations of the Alderwood soil for Topsoil needs to a stockpiled during site preparation
<br /> w' homesites and septic tank absorption fields are the and sub a - 6,. used to cover the exposed un 66- 'rig
<br /> depth to the hardpan and the seasonal perched water material Ad.'tons of fertilizer and peat are de :i .a e
<br /> • table.Onsite waste disposal systems often fail or do.not p�t4 s--`c mng:swirl for lawns.
<br /> function properly during periods of high rainfall.Drainage This ¢ a + capability subclass e.
<br /> r, is needed if buildings with basements and crawl spaces _Bellingham sWty clay loam. v ery deep,poorly
<br /> b are constructed. Topsoil needs to be stockpiled during ,, -;net soil is in depressionai ar=-s.it formed in
<br /> ire< site preparation and subsequently used to cover the alluvium and lacustrine sedi Areas are regular in
<br /> 5'^ exposed material.Additions of fertilizer and peat are shape and are about 2 to , acres in s The native
<br /> for
<br /> desirable prior to seeding grasslawns.
<br /> 4.4 r This map unit is in capability subclass lVe. vegetatiOn is mainly g - and sedges.Elevation is 50 to
<br /> 800 feet Slope is 0 to percent The average annual
<br /> 44?, 6-�►ldefYY00d-Urban land complex,8 percent
<br /> precipitation is ebb .45 inches,the average annual air
<br /> lf temperature rs -• 50 degrees F,and the - -a=
<br /> Slopes.This map unit is on fill plains. ors irregular _ is 1 180 .
<br /> `' in shape and are 25 to 100 acres. " e.The native frost-free
<br /> vegetation is mainly conifers a dwoods.Elevation is Typically, surface layeris very dark a clay
<br /> 1; 10am ab•, ruches thick.The subsoil to : .epth of 60
<br /> 50 to 550 feet.The.aver annual precipitation is about inches o • - is mottled,gray and a 'pity clay-
<br /> 40 inches,the avera nual air temperature is about Ind ,,,�, in this unit are small area a Terris
<br /> degrees F, average frost-free season is 170 M .„'lists,very poorly drained « a.a . sous, Norms
<br /> • to 190 days. sot along upland drains.- - t-,Witsap and Paste soils
<br /> This u ' s about 60 percent AMerwood gravelly on terraces,and Bellingham ,•Is that have been
<br /> ' I about 25 percent Urban lard.The «a,,,•*nests drained. Included areas •t up about 10 percerdof the
<br /> " unit are so intricately intermingled it was not
<br /> r� total acreage_
<br /> Ili practical to map them separately at the -.- e used. Permeability of * . eltirmgharn soil is slow.Available
<br /> Included in this unit are small = --. of Everett and water capacity is -, Effective rooting depth is lmiited
<br /> .; lsanola soils on terraces and • Plains,Kitsap by a.seasonal water table that is at a depth of 0 to
<br /> sells on terraces and t - «- �� _ .-mils,and Ragnar about 12 i -- from November to June.Runoff is very
<br /> soils on outwash plains.I a.6 areas make op about slow,and a hazard of water erosion is slight. Pond-mg
<br /> 15 percent of the a F-:, . «sage. occurs a November to June.
<br /> The Alderwood �1. is moderately deep and Th ti it is used for pasture,woodland,urban
<br /> • moderatelyHeel ,rained.It formed inglacial tiff
<br /> _ Typically„-- ,-'oent and wildlife haht.
<br /> tpits the surface er is very dark grayishfrown gravelly is unit is suited to pasture if the ex - water on the
<br /> sandy I a. • about.7 inches.thick.The upper part of the
<br /> 4 surface is removed.Tile drains or 3J b�- • hES can be
<br /> • dark yellowish brown and dark brown very . used if suitable outlets are available „- ,a when the
<br /> loam about 23 inches thick..The lower of the
<br /> gra °ly sandy soil in this unit is wet results in a .a- t.-
<br /> a- + is olive brown very gravelly sandy 5 surface layer,poor tilth,and r .u infiltration.Use of
<br /> • �2F' inches thick.A weaklycemented is at a a, --k : rotation,and restricted
<br /> �` depth proper stocking rates,
<br /> _,;; of about 35 inches.Depth to the pan ranges from grazing during wet pen..: fps to keep the pasture in
<br /> 20 to 40 inches. good conditon.Proper a .r2,,g practices,weed control,
<br /> t61 , Permeability of the Alderw soil is moderately rapid and fertilizer are n e for rrmasarnurn quality of forage.
<br /> above the hardpan and v slow through it.Available This unit is sill' to red alder.On the basis of a 50-
<br /> water capacity is low. . rooting depth is 20 to 40 year site curve, • e mean site index is 83.The mean
<br /> inches. Runoff is ,and the hazard of water erosion annual incre , , at culmination(CMAi)for red alder at
<br /> •'10,,,, is slight A perched water table is at a depth of age 40 is 8• cubic feet per acre.Among the trees of
<br /> 18 to 36 i om January to March. limited : 6. on this unit are Douglas-fir,bigleaf maple,
<br /> Urban consists of areas that are covered by west edcedar,and western hemlock.Among the
<br /> streets, dings, parking lots,and other structures that corn ,•a n forest understory plants are trailing blackberry,
<br /> x obscure or alter the soils so that identification is not w:- swordfern,thimbleberry,salrnonberry',and
<br /> �` possible. huckleberry.
<br /> The Alderwood soil in this unit is used mainly for The main limitation for the harvesting of timber is soil
<br /> �`:' parks, building sites, lawns, and woodland. wetness,which-iimmits the use of equipment to dry
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