9001 AIRPORT RD Geotech Report 2018-01-02 MF Import

i Subswfare Fxpla�ation. Geologic AazArd, and IPrel6ninnrY Ceo[echnical Engineering Repon Sho-fsle Skills Ceruer Addirion prelimi Desi n Recommendanwu I Evercn. Washingtcn �etaining w�il. Rockeries should not be used to face fi11s greater than 4 feet in thiclmess unless che fills aze reiuforced. 9 2 Temporazy Cut Slopcs [n our opinion, stable construction slopes should be We responsibility of the conuactor �d should be determined during construction. For estimating purposes, however, we anticipate that temporary, unsupported cut slopes in ehe filt can be made at a maximum slope of 1.SH:IV (Horizontal:Vertical) or flatter while uoi�P�� e�wo keope�at onst [so,mens oughing a�d maximum slope of 1H:IV. As is typ� raveling may occur, aud cut slopes may have to be adjusted in the field. If ground water seepage is encountered in cut slopes, or if surface water is not routed away from temporary cut slope faces, flatter slopes will be required. In addition, �SHA/OSHA regulations should be foilowed ac all times. 9.3 Site Disturbance Some of the on-site soils contain a high percentage of fine-grained material, which makes ihem moisture-sensitive and subject to disturbance when wet. Most of the shallow soils encountered in our explorations were judged to be at or slightly over their optimum mois�re content for compaction at the time of our study. The contractor must use care duringticulazly du ng we excavation operations so that the underlying soils aze not softened, p weather conditions. If disturbance occurs,'the sofrened soils should be removed and ihe azea brought to grade with swctural fill. Because of tl�e moisture-sensitive nahire of the soils, we anticipate that wet weather construction would significandy increase the earth�'+ork costs over dry weather construction. 10.0 STRUCTURAL FILL Structural fill may be necessary to establish desired grades and for utility [renche ac'a le�nt, -�•ferences to structura! fill in this report refer to subgrade prepazation, fill typ , p and compaction of materials, as discussed in this section. In those azeas where existing uncuntrolled fill is present, we recommend that it be removed and, where suitable, set aside for reuse. Our recommendations for the placement of structural fill aze presented in the followi�g sections. 10.1 Fill P_ lacenien� After stripping, planned excavxtion, and any required overexcavarion has been performed to the satisfaction of the geotechnical engineedengineee�n8o l�esm�ified Proct t maximum exposed ground should be recompacted to atleast 90 p ASSOCIATED EARIN SC/ENCES INC June I1, 20�78 Page i 1 Er,ne fF,(180113A5-�'rolear�lPcg07/3��