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J . HOLEINFELDER &. ASSOSATESrw <br /> GEOTECHNICAL CONSULTANTS • MATERIALS TESTINGCi i..,V!. I <br /> LAND & WATER RESOURCES <br /> 2825 EAST MYRTLE STREET MAY 131985 <br /> STOCKTON, CA 95205-4794 <br /> (209, 948.1345 ENVIROMENTAL HEALTH <br /> FERMIT/SERVICES <br /> File No. S-2178-6 <br /> October 11, 198491- ill \ <br /> IJ ocr .ts l°a <br /> Economic Development Association I� ,4 al <br /> of San Joaquin County P. D•A <br /> 709 North Center Street, #2-A _r- ,� <br /> Stockton, CA 95205 /y L' <br /> Attention: Mr. Syl Lange <br /> Subject: SOIL BORINGS AND PERCOLATION TEST RESULTS <br /> PROPOSED INDUSTRIAL BUILDING SITE <br /> SOUTH OF LOUISE AVENUE OFF HARLAN ROAD <br /> LATHROP, CALIFORNIA <br /> Gentlemen: <br /> As requested on September 19, 1984, representatives of our firm drilled two <br /> soil borings at the subject site and performed three percolation tests within <br /> the proposed drainage pond. The soil borings were drilled on September 21, <br /> 1984, using a truck-mounted drill rig equipped with 6-inch diameter continuous <br /> flight auger. Boring 3 was drilled between Borings 1 and 2, which were drilled <br /> for preliminary studies performed by our firm in May and June 1984. Boring 4 <br /> and the three percolation test holes were drilled in the proposed drainage pond. <br /> Reference is made to our previous reports entitled "Preliminary Soils <br /> Investigation," dated May 10, 1984, and "Proposed Industrial Building Site," <br /> dated June 4, 1984. <br /> The three percolation test holes were drilled to approximately 3 feet deep <br /> and 4-inch inside diameter perforated PVC pipe was placed in the test holes. A <br /> representative of our firm performed the percolation tests .on September 29, <br /> 1984. The results of the percolation tests are presented in a following <br /> paragraph. - <br /> In general, the soil conditions encountered in our soil borings and per- <br /> colation holes consisted of brown silty fine sands at the surface extending to <br /> depths of approximately 6 feet below existing ground surface. Beneath these <br /> sands in Boring 3, brownish grey sandy silt was encountered extending to the <br /> maximum depth ekplored of 15 feet. Beneath the sands in Boring 4, clean sands <br /> were encountered to approximately 13 feet, where clay and silt soils were <br /> encountered extending to the maximum depth explored of 15 feet. <br /> Groundwater was encountered in the borings at a depth of approximately 8 <br /> feet below existing ground surface. We note that in the preliminary reports <br /> prepared by our firm in May and June 1984, groundwater was encountered at the <br /> approximate same elevation. We note that in other studies performed by our firm <br /> OTHER OFFICE: <br /> Hi.ti<IE • Sacramento • Walnut CmeR • Fn.. • Merced Reno • las Ve6•s • k George, Utah <br />