7125 EVERGREEN WAY 2018-01-02 MF Import

Soil survey on south- and southwest-facing slopes. en igs are made in the canopy, invading b hy if not controlled, can delay the esta hment of i�s. Because the rooting depth is r ricted by a an in the Alderwood soil, tre are subject to ;.., ._. ;,_ The main itations o( the Alde d soii for septic j�enk absorptio Ids and homesi �� e steepness of �,�ope and a seas I perched er table. Effluent from ' eysorption fields fio laterall bove the pan and can - seep at the hottom of e rainage is needed if i buildings with basements crawl spaces are �,constructed. This soil sl readiiy when saturated. :r The main limitations the erett soil for septic tank �"absorption fields are eepness f slope and seepaye. If a� the densiry of hous' is modera to high, communiry :'sewage systems needed to pr nt contamination of :i.water supplies a resuit of seepag om onsite � sewage dispo systems. Road cuts t to slough -S readily. `: To prote the soiis in this unit trom eros during -, construc ' n, disturbed areas need to be see and ; runoN uid be controlted. ;� T' map unit is in capability subclass Vlle. ? 5—Alderwood-Urban land complex, 2 to 8 percent = u� a. This map unit is on till plains. Areas are irregular : m �e and are 700 to 1,000 acres in size. The native vegetation is mainly conifers. Eievation is SO to 550 feet. The average annual precipitation is about 40 inches, the average annual air temperature is about 50 degrees F, wd the average frost-free season is 170 to 190 days. : This unit is about 60 percent Alderwood gravelly sandy bam and ahout 25 percent Urban land. The components :' of this unit are so intricately intermingled that it was not `. practical to map them separately at the scale used. � Included in this unit are small areas o( McKenna and � Norma soils and Terric Medisaprists in depressional ,• areas and drainageways on piains. Also included are smali areas of soiis 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. Inciuded areas make ; �p about 15 percent of the totai acreage. The Alderwood soii is noderately deep over a hardpan -end is moderateiy well drained. it formed in glacial till. - TYpically, the surface layer is very dark grayish brown 9�avelly sandy loam about 7 inches thic!c. The upper part �_ o� the subsoil is dark yellowish brown and dark 6rown Yery gravelly sandy Ioam about 23 inches thick. The : bwer part is olive brown very gravelly sandy loam about �:; 5 inches thick. A weakly cemented hardp2n is at a depth T< a about 35 inches. Depth to the hardpan ranges from � to 40 inches. P�eability of the Alderwood soil is moderately rapid '� fhe hardpan and very slow through it. Available � wa�e� �apacity is low. Efiective rooting depth is 20 to 40 :, �ches. Runoff is slow, and the hazard of water erosion �: �" S, �:' Snohomish County Area, Washington is sliaht. A seasonai perched water table is at a depth o 18 to 36 incnes from January to March. Urban land is areas that are covered by streets, buildings, parking lots, and other structures that obscure or alter the soils so that identitication is not possible. The Alderwood soil in this unit is used mainly for parks, building sites, lawns, gardens, and woodland. The main limitations of the Alderwood soil for homesites and septic tank absorption fields are the depth to the hardpan and the seasonal perched water tabie. Onsite waste disposal systems often fail or do no function properly during periods of high rainfall. Drainag� is needed if buildings with basements 2nd crawl spaces are construcied. Topsoil needs to be stockpiled during site preparation and subsequentiy used to cover the exposed material. Additions of (ertilizer and peat are desirable prior to seeding grass for lawns. This map unit is in capability subclass IVe. Alderwood-Urban land complex, 8 to 15 percer slo s. This map unit is on till plains. Areas are irr ul� in s pe and are 25 to 100 acre, in size. The na' e' veget tion is mainly conifers and hardwoods. EI ation 50 to 0 feet. The average annual precipitati is a6oi 40 inch , the average annual air temperatur is about 50 deare F, and the average frost-free s son is 170 to 190 da . This unit about 60 percent Alderwo gravelly sanc loam and a ut 25 percent Urban Iand he componen. of this unit ar so intricately interming d that it was not practical to m them separately at e scale used. Included in t unit are small ar s of Everett and Indianola soiis o terraces and o ash plains, Kitsap soiis on terraces d terrace es rpments, and Ragnar soils on outwash p'ns. Inciud areas make up about 15 percent of lhe to I acrea . The Alderwood soi ' mo rateiy deep and moderately well draine It rmed in glaciai till. Typicall the surface tayer is ve k grayish brown gravelly sandy loam about 7 inc thick. The upper part of the subsoil is dark yellowis wn and dark brown very graveily sandy ioam ut inches thick. The lower part is olive brown v grav ly sandy loam about 5 inches thick. A we y cemen d hardpan is at a depih of about 35 inche Depth tc t hardpan ranges from 20 to 40 inches. Permeahiliry the Alderwood il is moderately rapi above the har an and very slow rough it. Available water capaci is low. Effective root g depth is 20 to 4 inches. Ru is slow, and the haza of water erosior is slight. easonal perched water ta e is at a depth 18 to 36 ' ches from January to March. Urba and consists of areas that are vered by streets uildings, parking lots, and other uctures th2 obscu or alter the soils so that identific2h is not The Alderwood soii in this unit is used mainiy for parks, building sites, lawns, and woodland. 'T �{