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l T <br /> aNOV 5 X986 - <br /> GROUND�rVATER NOV <br /> HEALTH <br /> El 1:1 TECHNOLOGY, INC. PERMIT/SERVICES <br /> OIL RECOVERY SYSTEMS 4080 Pike Lane, Suite D, Concord, CA 94520.1227(415)671-2387 <br /> October 13, 1986 <br /> 20-2894 <br /> Dave Lewis <br /> The Southland Corp. <br /> P.O. Box 404 <br /> Pleasanton, Ca. 94566-0040 <br /> Re: Soil Contamination Abatement Options 7-Eleven Store 9110 <br /> Thornton Road, Stockton, California <br /> Dear Dave, <br /> INTRODUCTION <br /> This letter is provided to address concerns raised by <br /> Mr. Gordon Lee Boggs of the California Regional Water Quality <br /> Control Board, Central Valley Region in regards to the hydrocarb- <br /> on soil contamination existing beneath the 7-Eleven Store pump <br /> island at 9110 Thornton Road in Stockton, California. As you <br /> know the subsurface soil contamination resulted from an inadvert- <br /> ant leak of unleaded gasoline from a product line beneath the <br /> pump island. The purpose of addressing the soil contamination is <br /> that the adsorbed hydrocarbons act as a continuing source for <br /> dissolved contamination due to fluctuations of the water table <br /> and vertical percolation of surface infiltration through the <br /> contaminated soil horizon. The installation of a soil venting <br /> system to protect nearby buildings from hydrocarbon vapor <br /> impacts and to provide some volatilization (cleanup) of hydro- <br /> carbons in the soil pore spaces beneath the pump island was <br /> presented in Groundwater Technology Inc, ' s Hydrocarbon Abatement . <br /> Program Proposal dated September 1, 1986. The following text <br /> outlines 'a number of soil treatment options, including soil <br /> venting, with estimated costs for implementation of each option. <br /> These soil treatment options would be implemented in addition to <br /> and/or in conjunction with the presently proposed product <br /> recovery and groundwater treatment system. <br /> Other offices:Redondo Beach.CA;Tampa, FL;Mandeville,LA;Norwood,MA;Novi.Ml; <br /> Minneapolis, MN;Greenville.Nli;Chadds Ford,PA;Montreal,Quebec,Canada <br /> 1Y� <br />