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STATE OF CALIFORNIA <br /> PETE WILSON. Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD, SUITE A <br /> SACRAMENTO. CA 95827-3098 r rt ¢ <br /> PHONE: (916) 361-5600 <br /> FAX: (916) 361-5686 APR j 5 1992 <br /> ENVIRONVIUNTAL t"'!i AL11-H <br /> PERMIT/SERVICES <br /> 8 April 1992 <br /> Mr. Raymond Quaresma Mr. Steven Mothershed <br /> 26290 South Union Rd. 1127 Wood Duck Ct. <br /> Manteca, CA 95336 Manteca, CA 95336 <br /> QUARESMA AND MOTHERSHED PROPERTY, 91 EAST THOMSEN, LATHROP, SAN JOAQUIN COUNTY <br /> Staff has reviewed the request for closure and the file for this site. The <br /> review revealed that the site had been a service station but the buildings and <br /> underground tanks were- removed sometime in the 1970's. In April 1990, several <br /> borings were drilled and up to 7600 ppm TPH was encountered in the soil at a <br /> depth of about 10 feet. In August 1990, several more borings were installed <br /> to further define the extent of soil contamination. Up to 22,000 ppm TPH was <br /> encountered in one of the 'newrborings and a ground water sample collected from <br /> the bottom of the boring contained up to 20,000 ppb TPH and 9.2 ppb benzene. <br /> Contaminated soil was excavated in January 1991 and soil samples collected <br /> from the bottoms and side walls of the excavation contained a maximum of 17 <br /> ppm TPH. Three monitoring wells were also installed, one in the former <br /> contaminated soil area. Depth to ground water is about 11 feet, soil is <br /> predominantly sand, and gradient is to the northeast. Two quarters of ground <br /> water samples were collected in September and December 1991 . None of the <br /> wells contained detectable levels of ground water contamination, including the <br /> well installed in the former contaminated soil area and t-he downgradient well . <br /> Based on the information provided, Board staff has determined, and the San <br /> Joaquin County Environmental Health Division concurs, that appropriate <br /> response actions have been completed, that acceptable remedial practices -were <br /> implemented,w and that.; at��this -t=ime ne furthea- investig-a-tion:, remedial-aor <br /> removal action, or monitoring' is required at the Quaresma and Mothershed <br /> Property at 91 East Thomsen Road, Lathrop. San Joaquin County has post- <br /> remedial actions, including well abandonment procedures, with which you must <br /> comply before closure is complete. <br /> Nothing in this determination shall constitute or be construed as a <br /> satisfaction or release from liability for any conditions or claims arising as <br /> a result of past, current;; orifuture operations at this location. Nothing in <br /> this determination is intended or shall be construed to limit the rights of i <br /> any parties with respect to claims arising out of or relating to deposit or <br /> disposal at any other location of substances removed from the site. Nothing <br /> in this determination is intended or shall be construed to limit or preclude <br /> the Board or any other agency from taking any further enforcement actions. <br /> I <br />