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Chron-File <br /> September 19, 11195 I <br /> Trepanier Engineering <br /> 1420 Hewitt Ave. Ci i'r _?UT <br /> Everett, WA 98201 <br /> Attn: Mr. Theodore Trepanier <br /> Re: Site Preparation and Structural Fill Recommendations <br /> Heritage Estates, Everett, Washington <br /> Gentlemen: <br /> At your request, Mr. Peter Moon of Land Technologies visited the referenced project site <br /> on September 7th to observe current conditions at lot numbers 10 through 13, and to <br /> obtain a sample of the proposed fill soils for laboratory testing. This letter provides <br /> recommendations for site preparation and structural till placement in this area of the <br /> development. <br /> The soil sample consisted of a brown, silty, gravelly sand, typical of weathered glacial till. <br /> The sample was tested by Cascade Testing Laboratory, Inc. to determine the maximum <br /> dry density of this material using the modified Proctor testing method (ASTM: D 1557). <br /> The maximum dry density was determined to be 120 pounds per cubic foot (PCF) with an <br /> optimum moisture content of 1 I percent. The laborate y test results are attached. <br /> Site Preparation <br /> Areas which will receive structural fill, and will be occupied by buildings, roads, parking <br /> areas, etc. should be cleared of vegetation, and stripped of surficial topsoil, dense root <br /> accLmulations and existing fill. The organic-laden soils stockpiled as a result of stripping, <br /> would not be suitable for use as structural fill, but may be used in landscaped areas if <br /> desired. <br /> Beneath the topsoil layer, the silty, gravelly sand will be encountered during grading <br /> operations. Care should be taken to schedule equipment and procedures to minimize <br /> disturbance to subgrade soils. Due to the fine-grained nature of these materials, <br /> earthwork should be scheduled during warm and dry weather conditions if possible. <br /> Topsoil stripped from the site may be placed in windrows or stockpiles outside of the area <br /> to receive structural fill. These materials could then be spread over the structural fill, <br /> outside of building and pavement areas, to replicate the natural soil horizon. <br /> geotechVieritage.doc 1 9/ 18/95 <br />