1901 MERRILL CREEK PKY 2018-01-01 MF Import

i • ' gradation, placement and compaction. Also pmvided will b�: stnictura] u:l requiremrnts � as need� for support of the building and pavements, and our evaluation uf the effects of ' weather and/or constniction equipment on the on-site sc;�s and imported soils. � � 4. Yrovide foundation design recommendations including allowable soil bearing pressures for . shallow-spread footings for the proposed buildings. 5. Yrovide recommendations for support of slab-on-gnde floors. 6. Evaluate the settlement perfom�ance of spread footings and floor slabs. . 7. Quantitatively evaluate slope stabiliry, and provide recommendations for slope setbacks. 8. Provide rocommendations for pavanent subgrade support and design sections for parking � and driveway areas. ' 9. Provide recommendations for surface and s��bs:::face drainage systems ro control ground I water conditions, if appropriate. ' ' � SITE CONJITIONS ' GEOLOGY Gealogic maps within the near viciniry of the site classify the subsurface soils as glacial tilt, , advance outwuh, and the older soils of the Whidbey Fortnation. Glacial till is a nonsorted mixture of silt, sand, clay, gravet, cobbles s�,d boulders. The advance outwazh soils were deposited by meltwater flowing from the advancing front of the glacier, and rypically consist of I ciean sand with a variable gravel content. The Whidbey Formation rypically consists of dense � sands and gravels ovedying or interbedded wilh stiff to hard silts. All of thae deposits have bean (^ glacially overridden and therefore have high shear strength and low compressibiliry � characteristics. The sand over the hard silts can lead to a perched ground water condition. 1'his geologic r � condition has caused landslide activiry in the Puget Sound Region. r SURFACE CONDITIONS ` The property is densely forested with second growth wnifer, dxiduous trees, and a thick ,-. growth of underbrush. As described in the introductie+n section of this repott, a nlatively level ! bench is located on the upland, westem portion of the site. From this bench, the site slopes down toward Merrill Ring Creek at what appears to be an average slope inclination near 40 perceni. A site plan showing the recent topognphic survey completed by Eush Rad & Hitchings is presented az Figure 2. �- An engineering grnlogist from our ficm performed a site raronnaissance on August 21, 1997 to catalog evidence of rceent or historic slc�e instability and erosion. Geology, vegetation, and surface hydrology were observed on the property along with po�tionc of the adjacent � properties to the north and west. In general, we did not observe changa in site conditions since preparation of the 1990 and 1991 gmtechnical reports by Cascade Geotechnical, Inc. !'- G e o E n ` i n e e r s Z PileNo.1460�006-77d1�0/I11297 �