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80 Brown.and Caldwell T <br /> Consultants <br /> 3=80 Buskirk Avenue <br /> �- Pleasant Will,CA 94523-4342 <br /> P.O. Box 8045 <br /> Walnut Creek,CA 94596-1229 <br /> (510)937.9010 <br /> FAX(S10)937-9026 <br /> SEP 2 7 1.393 <br /> ,. September 24, 1993 EN IRO MENTA€€CES CTH <br /> PERMrr.. <br /> Mr. Michael Collins <br /> Registered Environmental Health Specialist <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 445 N. San Joaquin Street <br /> Stockton, California 95201-2009 17-7603-01/1 <br /> Subject: Kent's Oil Remediation Project <br /> Preliminary Results of Excavation Samples and <br /> Amendment to Work Plan for Backfilling of Excavation <br /> V ' <br /> Dear Mr. Collins: <br /> y Pursuant to the San Joaquin County's (County) request for confirmation of the quality of the <br /> soil in the vicinity of the excavation at the subject facility, Brown and Caldwell (BC) was <br /> authorized by Sheldon Oil Company (Sheldon),to collect ten soil samples from the sidewalIs <br /> and bottom of the excavation on September. 20, 1993. Samples were collected under your <br /> supervision, at locations approved_ by you, and were submitted to Western Environmental <br /> Science and Technology (WEST) Laboratory in Davis, California, for analysis of total <br /> �,.. petroleum hydrocarbons as diesel (TPHd).and motor oil JTPHmo) following the toxicity <br /> characteristic leaching procedure (TCLP) listed in Test Methods for Evaluating Solid Waste <br /> Ph ical/Chemical Methods. November 1986 SW-846 Third Edition. Analytical laboratory <br /> +,- data sheets are presented in Attachment A and summarized in Table 1. in brief, TPHd and <br /> TPHmo were not identified at or above the analytical method reporting limit in any of the ten <br /> samples. Based on these results Sheldon would like to begin backfilling the excavation as <br /> �- soon as possible, <br /> In the September 3, 1993, BC Status Report For Kent's Oil Remediation Project there was <br /> *� a recommendationto place approximately 2 feet of compacted clay material in the base of the <br /> excavation to act as a liner. However, since than; recommendation was presented to the <br /> County, Kleinfelder, Inc. (Kleinfelder), the geotechnical engineering firm responsible for the <br /> L" design and certification of the backfilling of the excavation, has recommended that a clay liner <br /> not be used. They recommend that "multiple layers of 6 or 10 mil visqueen with proper <br /> overlapping and caulked seams be considered." Kleinfelder sites concerns regarding the safe <br /> QP.1 S PSaZ3 <br /> L.' <br />