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FOOTHILL <br /> ENGINEERING <br /> 12793 PADDY CREEK LANE LODI, CA 95240 <br /> PH. (2M)368-9381 FAX[209) 367-1163 <br /> Mr. Harland Knoll April 14, 1997 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. O. Box 388 <br /> Stockton, CA 95201 <br /> Fax: 464-0138 <br /> Subject: 400 N. El Dorado Street Stockton CA. <br /> Owner: Ms. Sara Wasserman <br /> Dear Mr. Knoll: <br /> Ms. Wasserman., owner of the property located at 400 N. El Dorado Street, has retained Jim Thorpe <br /> Oil and Foothill Engineering to investigate the existing soil under three underground storage tanks <br /> on the above stated property. The proposed investigation is planned to begin April 18, 1997 with a <br /> slant boring under the tanks. The following is a proposed work plan for the investigation. <br /> THE SITE INVESTIGATION WORK PLAN <br /> The three tanks that are the subject of this investigation were closed in place by filling with sand. The <br /> vent and fill covers for each tank are still in place in the concrete sidewalk. The two large gasoline <br /> tanks are located to the Horth and south of a small waste oil tank (See attached drawing of the tank <br /> location). <br /> Due to the tank Iocation under the sidewalk,we propose that four slant push bores be used to extract <br /> samples from under the tanks (See attached sketch). Each bore would terminate at approximately <br /> 18'below the surface and directly under the tank. Three samples will be taken from each of the push <br /> bores, at approximately third points. Samples will be extracted using a standard split spoon sampler <br /> with a brass sample tube liner. Each soil tube will be capped with a layer of aluminum foil secured by <br /> plastic caps, sealed with duct tape, labeled for identification, and stored on ice for transport to the <br /> laboratory. Soil samples will be transported under a chain of custody to a California Certified <br /> Laboratory for analysis. Samples will be analyzed per EPA Methods 8020 (BTEX), (MTBE), <br /> 5030/8015(M) TPH-Gasoline. A selected sample from under the waste oil tank will be tested for <br /> heavy metals. Foothill Engineering will issue an engineering report of all findings of this site <br /> investigation. <br /> Please address any questions, corrections, or additions to Ery Rifenburg, Foothill Engineering, phone <br /> 209/368-9381 <br /> Respectfully submitted, QaaF"r�ssioAJ <br /> RIFE&6 <br /> Foo�n sneering <br /> f <br /> 197' T,{ <br /> Ex � <br /> Ery Rifenbu/rg, P CO- <br />