4945 OCEAN AVE 2018-01-02 MF Import

GEOTECHNICAL ENGINEERING STUDY Mr. Rick Remsing May 5, 2003 E-10558 Page 5 Structural fill is defined as compacted fill placed under buildings, roadways, slabs, pavements, or other load -bearing areas. Structural fill under floor slabs and footings should be placed in horizontal lifts not exceeding twelve (12) inches in loose thickness and compacted to a minimum of 90 percent of its laboratory maximum dry density determined in accordance with ASTM Test Designation D-1557-91 (Modified Proctor). The fill materials should be placed at or near their optimum moisture content. Fill under pavements and walks should also be placed in horizontal lifts and compacted to 90 percent of maximum density except for the top twelve (12) inches which should be compacted to 95 percent of maximum density. During dry weather, most soils which are compactible and non -organic cat, be used as structural fill. Based on the results of our laboratory tests, the sandy native soil at the time of the exploration appears to over the optimum moisture content and will require moisture conditioning prior to its use as structural fill. With a summer construction schedule drying of the site soils should be feasible provided the grading operations are conducted during dry weather. Based on laboratory testing, the native soil has between 9 and 50 percent fines passing the No. 200 sieve. Soil with fines in this range will degrade if exposed to excessive moisture, and compaction and grading will be difficult if the soil moisture increases significantly above its optimum condition. If the native soil is exposed to moisture and cannot be compacted then it may be necessary to import a soil which can be compacted. During dry weather, most non - organic compactible soil with a maximum particle size of six inches can be used. Fill for use during wet weather should consist of a fairly well graded granular material having a maximum particle size of six inches and no more than 5 percent fines passing the No. 200 sieve based on the minus 3/4-inch fraction. A contingency in the earthwork budget should be included for this possibility. Slope Stability The slopes on the site range from about 17 percent on the upper bench on the south portion of the site to 36 to 62 percent slopes on the central portion of the site. Subsurface soil and groundwater conditions indicate landslide hazard areas where slopes exceed 15 percent in accordance with the City of Everett code. Earth Consultants, Inc.