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APPt:NDIX A <br />J. H. 19EINFELDER & ASSO*ATES <br />GEOTECHNICAL CONSULTANTS - MATERIALS TESTING <br />LAND & WATER RESOURCES <br />282S EAST MYRTLE STREET <br />STOCKTON. CA 9520$.4794 <br />(2 09) 948-1345 File No. S-2578-1 <br />October 12, 1983 <br />San Joaquin Department of Public <br />Works <br />Post Office Box 1810 <br />Stockton, California 95201 <br />Attention: Mr. Gene Delucchi <br />Subject: REVIEW OF PREVIOUS REPORTS <br />FORWARD INC. PROPERTY <br />AUSTIN ROAD/SAN JOAQUIN COUNTY. CA <br />Gentlemen: <br />At your request, the Writer reviewed the following reports prepared for <br />the Forward, Inc. site on Austin Road: <br />0 "Geotechnical Investigation and Waste Management <br />Studies, Proposed 150 Acre Class 11-1 Disposal <br />Site, Stockton, California", by Emcon, dated <br />July 7, 1972. <br />"Report of Site Information, Austin Road Resource <br />Recovery and Disposal, San Joaquin County, Ca <br />ornia for Forward, Inc.", Beta Associates, dated <br />April 28, 1978. <br />As discussed with you. our firm has also provided geotechnical services at <br />the site. These services have included test drilling and soil compaction tests <br />during the placement of clay lining. Numerous permeability tests on the sub- <br />surface soils have also been completed by our firm. <br />Based on our review of the referenced reports and information in our <br />files, we conclude that the general soil condition's consist of interbedded <br />strata of silts and clays with some lenses of sand. The permeability of the <br />silts and clays encountered are generally in the range of 10-6 to 10-8 cen- <br />timeters per second. The lenses of sand have permeabilities in the 10-3 cen- <br />timeters per second range. During the placement of clay lining which was <br />observed by our firm, lenses of sand, if encountered, were overexcavated and <br />replaced with native clay materials. <br />01"Is officli. 12 <br />I&sftm . <br />