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�I kTj K L E I N F E L D E R An rmpbYec unaltYl rllwr)ai>y ' File No. 20-2245-11.G02 November 20, 2001 t Mr. Dan Silva DSS Construction k Post Office Box 6099 Stockton, California 95206 Subject: SLOPE STABILITY ANALYSIS RECLAIMED SLOPE i KRC AGGREGATES, INC. CLEMENTS, CALIFORNIA ;k APPLICATION NO. QX-94-2 Dear Mr. Silva: The purpose of this letter is to present the results of a stability analysis of the reclaimed slope at j the KRC Aggregate facility in Clements, California. We have reviewed the letter dated June 5, 1995, from the San Joaquin County Community Development Department summarizing the Conditions of Approval for the aggregate facility under Application No. QX-94-2. Item M of this document states that final slopes shall not exceed 3:1 (3 horizontal to 1 vertical). The purpose of our evaluation was to document that steeper slopes, similar to those used for all the other aggregate facilities in San Joaquin County could be used at the KRC plant. We understand that the typical excavations extend between 25 to 40 feet below the existing ground surface. It is proposed to buttress these excavation slopes with reclaimed material consisting of various combinations of sand, silt, clay and gravel. On November 13, 2001, a representative from our firm performed 6 field density tests:'din recent fill areas at the site which were compacted using scraper equipment. It is proposed to use similar equipment to construct the reclaimed slope. The in-place wet densities vary from approximately 116 to 139 pounds per cubic foot (pef) with dry densities varying from approximately 99 to 129 pef Moisture contents vary from approximately 6 to 20 percent, indicating the varying amounts of clay minerals at the test locations. The results of these tests are attached. Two bulk samples were obtained which appeared to represent the spectrum of reclaimed materials at the site. The maximum dry density and optimum moisture content for these two samples were 115.2 pef at 13.1 percent and 131.5 pcf at 7.1 percent. The results of these two tests are attached. Reference is also made to our attached letter dated October 5, 1992 summarizing 8 field density tests at the site using on site soils and two laboratory compaction curves on these materials. With compaction being achieved with loaded and unloaded scrapers only, we anticipated relative degree of compaction values in the range of 82 to the low 90 percent. In our opinion, the results of our in-place density tests confirm this range of compaction. In an effort to evaluate the 20-2245-1 1.G02/201 I L800 November 20,2001 �. Copyright 2001,Kleinfelder,Inc. Page I of 2 li KLEINFELDER 2825 East Myrtle Street,Stockton,CA 95205-4794 (209)948-1345 (209)948-0621 fax �l