1618 47TH ST SE 2016-01-01 MF Import

(�cutcchnical Iineinccri[i�! R��purt � Sinelc-I�amily Rcsidcnce 13vcrctt, Washington December 9. 200� � CG Pilc No. 2017 Pagc £ � The use uf un-site �oil as strucWral �ill «'ill be �lcpcndcnt un moi�ture contcnt control. Some dp�ing o��tlie � native soils may be necessary in order to achieve compaction. During warm, swmy days this could be I a accomplishcd by spreading the material in thin lifts and compacting. Some aertion and�or addition of I � moisturc may also be nccessary. �'�'e expect that compaction of the nati��e soils to structural fill I � spccifications would be difticult during ti•et�vcathec I Pill Placement: Pollo�;�ing subgrade prcparalion, placement of the structurat fill may proceed. Fill i � should bc placed in 3- to 10-inch-tliick uniform liRs, and each lift should be spread evenly and be thoroughly compacted pnor to placcmcnt of subsequent lifts. All swctura' fill underlying buildin�areas, � and within a depth of 2 fect Uelow pavement and sidewalk subgrade, should be compacted to at lcast 9� perccnt of its maximum dry density. Maximum dry dcnsity, in this rcport, refers to that dcnsity as � determined by the ASTM ll 1557 compaction test procedure. Pill more than 2 feet beneath sidewalks ar,d pavemen[ subb�rades should hc compacted to at Ieast 90 percent of the maximum dry density. The � moisiurc content nf the soil to Ue compacted should be within about 2 percent of optimum so that a rcadily comp�ctable condition exists. It m; v be necessary to overexcavate and remove �act surlicial aoils � in cases w!:cre drying to a compactaSlc condition is not fcasible. All cumpaction should be accomplished Uy cquinmcnt of a typc and size sufficicnt[o attain the desired degrce of compaction. � Temporar�� and Permanent Slopes Temporary cut slope stability is a function of many factors, such as the type and consistency of soils, � depth of the cut, surchargc loads adjacent to the e�;cavation, Iength of time a cut remains open, and thc � presence of surface or bRound water. It is exceedingly difficult under thcse variable conditions to estimate a stable temporary cut slope geometry. Therefore, it should bc die responsibility of the contractor to maintain aafe slope contigurations, since the contractor is coutinuously at the job site, able to observe Qic nature and wndition of the cut s]opes, and able to monitur the subsurface materials and ground �cater conditions encountcred. We anticipatc temporary cuts for installation of utilities. For planning purposes, �ve recon�mend that temporary cuts in the fill or naticc soils be no greater than 1.5 FIorizontal to 1 Vertical (1.�H:1V). If 6�ound�vater seepage is encountered, �ve would expect that flatter inclin�tions�vould be necessary. I � �ornerstone Geotechnical, Inc. h' /°�, --__�� _ __ _ , _ . .. _ _ . . _ .. . ._ . . `i1i � _i : 4 � �� :d'