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Chron-File <br /> -i I- <br /> September 19, 1991 <br /> Trepanier Engineering CI1 Y �i; ?_TT <br /> 1420 Hewitt Ave. L'Id1, ^.it .3unter <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 7tlt 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 fill 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 /> density erial using the modified Proctor testing method (ASTM: D 1557). <br /> dry of this mat <br /> was <br /> to be 120 pounds <br /> er <br /> c foot <br /> CF) with an <br /> The dry <br /> ensity <br /> optimum moisture content of 1determined <br /> percent. The laboratory estresul sI are attached. <br /> SiteSie Preo?�alion <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 /> accumulations and existing fill. The organic-laden soils stockpiled as a result areas if <br /> of stripping. <br /> would not be suitable for use as strtictural fill,but may be used in landscaped a <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 econditions these <br /> hes mate possible. <br /> earthwork should be scheduled during warm and dry <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 /> 9/ 18/95 <br /> geotechUrcritageAx <br /> .. 1 <br />