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! <br /> San Joaquin County DIRECTOR <br /> " Department Donna Her an,REHS <br /> Environmental Health D <br /> ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> ':{ Stockton, California 95202-3029 <br /> 11iiLl }:� PROGRAM COORDINATORS <br /> .: Carl Borgman,REHS <br /> Mike Huggins,REHS,RDI <br /> `FOR`' Website: www.sjgov.org/ehd Margarettagorio,REHS <br /> Phone: (209) 468-3420 Robert McCleuon,REHS <br /> Fax: (209) 464-0138 Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> January 31, 2008 <br /> Mr. Fred Bertetta,Jr. and Ms. Janet Heikel <br /> Olympian <br /> 1300 Industrial Road 14 <br /> Suite 2 40 ! <br /> San Carlos, California 94070 <br /> Subject: JIMCO Truck Plaza <br /> 1022kEast Frontage Road (Formerly 22502 South Highway 99) <br /> Ripon,California <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Site Assessment <br /> Report dated June 29, 2007, and quarterly monitoring reports for 2007, prepared and submitted <br /> by Conestoga-Rovers & Associates, Inc. (CRA) on your behalf for the above-referenced site. <br /> Based on lithological and soil/groundwater analytical data submitted for three cone penetration <br /> test(CPT)borings and nine associated adjacent borings; and ten soil borings (B-19 through B-28) <br /> advanced onsite to thirty feet below surface grade (bsg), CRA has recommended the following: I <br /> • Additional investigation to delineate the diesel-range hydrocarbons southeast of the I <br /> former diesel underground storage tank(UST); <br /> • Additional investigation to delineate the diesel-range hydrocarbons northwest, west, <br /> south, and southeast of the diesel pump station and monitoring well MW-6; ' <br /> • Installation of a soil vapor extraction/air sparge (SVE/AS) system to aid in the <br /> remediation of methyl tertiary-butyl ether (MTBE) and other petroleum hydrocarbon <br /> contamination, and <br /> • Removal of :tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), <br /> 1,2-dibromoethane (EDB), 1,2-dichloroethane (1,2-DCA), di-isopropyl ether (DIPE), <br /> ethyl tertiary-butyl ether (ETBE), and total extractable petroleum hydrocarbons as motor <br /> oil (TEPH-mo) from the analytical list for future quarterly groundwater monitoring j <br /> events. ! <br /> ! <br /> EHD concurs with the recommendation by CRA to conduct an additional investigation to <br /> determine the source of the diesel-range hydrocarbons near the diesel pump station and MW-6, <br /> and to delineate the diesel-range hydrocarbon contamination in the areas proposed by CRA. I <br /> Please submit a work plan to the EHD by May 1, 2008, that will address therdelineation-of.the__:.,._-�- 3 <br /> diesel-range-hydrocarbon contamination in soil and,groundwater both on- and!of-Atte <br /> I ..�_... _.......... ...�:. <br /> south. €,.i r <br /> Li Lt�IJL C j <br /> 1 <br />