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* r <br /> ENVIRONMENTAL HEALTH <br /> i PERMIT SERVICE <br /> GROUNDWATER 94 NOV 28 PM 1: 51 <br /> [LIE❑ TECHNOLOGY, INC. 140IHalyard Drive,Suite 140,West Sacramento,CA 95691.(916)372-4700 <br /> FAX(916)372-8781 <br /> November 16, 1994 <br /> Mr. Gordon Boggs <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, CA 98827-3098 <br /> Subject: Southland Store #20680 <br /> 9110 Thornton Road <br /> Stockton, California <br /> GTI Project 02070 5234 <br /> Dear Mr. Boggs: <br /> On behalf of The Southland Corporation (Southland), Groundwater Technology, Inc. is formally <br /> requesting a formal review of the request for closure at the above referenced site. On December 15, <br /> 1993, in a meeting with the California Regional Water Quality Control Board-Central Valley Region <br /> (CRWQCBVR) and the San Joaquin County Public Health Services (SJCPHS), Southland agreed to a <br /> scope of work which Southland believed would satisfy all requirements for closure at the site. The <br /> meeting was held because SJCPHS denied closure even after confirmation borings drilled in 1993 did <br /> not indicate the presence of petroleum hydrocarbons in the soil. <br /> The scope of work agreed to during the December 1993 meeting involved groundwater monitoring, <br /> conducting a soil vapor extraction, and providing SJCPHS with historical data and a closure report. All <br /> aspects of the criteria set forth in the meeting have been completed and the results were described in <br /> Addendum to Closure Report, dated April 27, 1994. In a letter dated July 12, 1994, SJCPHS denied <br /> closure and requested that Southland conduct additional soil borings at the site. The following is a <br /> summary of the closure request and Southland's position regarding the site. <br /> Groundwater Contamination <br /> Groundwater analytical data for the January 24, 1994 sampling event indicate a maximum of 1 part per <br /> billion (ppb) benzene and 34 ppb total petroleum hydrocarbons-as-gasoline (TPH-G) dissolved in <br /> groundwater. Results of groundwater sampling since 1989 have indicated the presence of petroleum <br /> hydrocarbons at or below California drinking water standards in random samples in only one well,MW-1. <br /> The data indicate residual hydrocarbons exist in groundwater concentrations at or below state maximum <br /> ADDENDWITR(STHL-6) <br /> Offices throughout the U.S.,Canada and Overseas <br />