1620 ORCA VIEW LN 2016-01-01 MF Import

i , �..JID L.NELSON ANU ASSOCIATES,INL'. � Consulling Enginttring Geulog}• ,lune 1, 1989 Project No. 7089 Page 2 ToCoaraphfcally the subject lot generally rises up a few to several feet from the west to the east within the Droposed residence area. Surrounding this area ;s a top-of-sloDe, which breaks doN�n to steep sloves directed toward the north, east and south. The steep sloDe along the northerly and easterly sides continues down to the base-of-slope, where an exlsting stream and res[dential development occur. The steeD slope along the southerly side is not as tong, and slopes down into a eastr.rly trendina dratnage swale. Vegetation consists prlmarily of various sized evergreen and deciduous trees, brush and grasses. Soils exposures, and fnformation derived from past information, ind[cate the � site to be c+robably underlain by compact glacial soils within the upper I elevation areas (such as the residence area) and interglacial soils near the base-of-slope. The area of the proposed residence placement aDPears to be � either dense glacial till or advance glacial outwash sands. Areas alona the sloDe aDPear to be underlain by the compact outwash sands, with exposures of compact (stiff) silty fine sand and flne sandy silt (Whidbey Formation) near � the loHer elevations of the 51oDe. Outcroppina around water aDoears to occur near the contact within the advance sands and interglacial silts, near the base-of-slope area Slope conditions observed fndicate the slope area to be relatively stable, ` with locat areas of instabfllty. The uCDer portions of the s1oDe appear I stable, wtth few sians of soil slipDage. The lower portions of the slope � apDear less stzble, with aoparent slide scarps, or slumping, occurring near the s1oDe toe. Outcropping ground water and local erosion appear to have created the less stable conditions. CONCLUDING OPINIONS General Residence development within the lot area fs understood to occur within the upland area just back from the top-of-s]oDe• Building setbacks of about 18 feet from the easterly and northerly s'.oee, and about 5 feet from the