326 79TH PL SW 2016-01-01 MF Import

Chron-File September 1S, 1995 AUG C ! 1996 Trepanier Engineering 1420 Hewitt Ave. CITY OF EVERETT Everett, WA 98201 Bldg. Permit Counter Attn: Mr. Theodore Trepanicr ' Re: Site Preparation and Structural Fill Recommendations Heritage Estates, Everett, Washington Gentlemen: At your request, Mr. Peter Moon of Land Technologies visited the referenced project site on September 7th to observe current conditions at lot numbers 10 through 13, and to obtain a sample of the propos^d fill soils for laboratory testing. This letter provides recommendations for site preparation and structural fill placement in this area of the development. The soil sample consisted of a brown, silty, gravelly sand, typical of weathered glacial till. The sample was tested by Cascade Testing Laboratory, Inc. to determine the maximum dry density of this material using the modified Proctor testing method (,tSTM: D 1557). The maximum dry density was determined to be 120 pounds per cubic foot (PCF) with an optimum moisture content of 11 pe,cent. The laboratory test results are attached. Sita Preparation Areas which will receive structural fill, and will be occupied by buildings, roads, parking areas, etc. should be cleared of vegetation, and stripped of surftcial topsoil, dense root accumulations and existing fill. The organic-laden soils stockpiled as a result of stripping, would not be suitable for use as s"ctural fill, but may be used in landscaped areas if desired. Beneath the topsoil sayer, the silty, gravelly sand will be encountered during grading operations. Care should be taken to schedule equipment and procedures to minimize disturbance to subgrade soils. Due to the fine-grained nature of these materials, earthwork should be scheduled during warm and dry weather conditions if possible. Topsoil snipped from the site may be placed in windrows or stockpiles outside of the area to receive structural fill. These r—terials could then he spread over the structural fill, outside of building and pavement areas, to replicate the natural soil horizon. geolechWcriLige.doc 1 9/ 18/95