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File No. 20-1008-38 <br /> August 1, 1990 <br /> San Joaquin County Public Works <br /> Solid Waste Division <br /> Post Office Box 1810 <br /> Stockton, California 95201 <br /> f <br /> i_ Attention: Rudy Rodriguez <br /> Subject: SLOPE STABILITY ANALYSES <br /> HARNEY LANE LANDFILL CLOSURE <br /> SAN JOAQUIN COUNTY, CALIFORNIA <br /> f Gentlemen: <br /> i._ <br /> At your request, we have completed the slope stability analyses for <br /> the Harney Lane Landfill located in San Joaquin County, California. <br /> our scope of services included a review of previous geotechnical <br /> t studies performed at the Harney Lane Landfill and a study of soil <br /> and waste strength characteristics at similar landfills. Reference <br /> is made to our preliminary geologic investigation dated September <br /> 3 , 1986, which includes discussions regarding the regional and site <br /> geology, geological history, and general soil conditions <br /> encountered at the site. <br /> We understand that the proposed closure will include a primary and <br /> t a secondary landfill. A typical primary landfill section consists <br /> ti <br /> #_. of a 2:1 (2 Horizontal:l Vertical)slope approximately 22 feet high <br /> with a 3 percent grade increasing from the top of the slope toward <br /> the center of the landfill. The critical slope on the primary <br /> landfill includes a V-ditch approximately 1 foot deep at the toe <br /> of slope. The critical secondary slope has basically the same soil <br /> characteristics as a primary slope with the exception of a 1.75:1 <br /> slope and an approximate 8 feet wide, 5 feet deep cut at the toe <br /> of slope. Both configurations include a 4 feet thick soil zone <br />