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Ultramar <br /> Ultramar Inc. Telecopy: 209-584-6113 Credit&Wholesale <br /> P.O.Box 466 209-583-3330 Administrative <br /> 525 W.Third Street 209-583-3302 Information Services <br /> Hanford,CA 93232-0466 209-583-3358 Accounting <br /> (209)582-0241 <br /> February 14, 1991 <br /> Ms. Laurie Cotul l a '�.� F� <br /> San Joaquin County Local Health District <br /> Environmental Health Division r ;, F19 <br /> P.O. Box 2009 � �T <br /> Stockton, California 95201 <br /> c �T <br /> SUBJECT: SITE CLOSURE REQUEST FOR BEACON STATION 502, 35 N. CH&K& <br /> LANE, LODI, CALIFORNIA <br /> Dear Ms. Cotulla: <br /> We have prepared this letter in response to your letter of Janary 3, 1991, <br /> regarding the above-referenced Ultramar facility. Your letter denies our <br /> request for regulatory site closure and lists specific reasons for your <br /> denial . Additionally, your letter states that the "groundwater plume of <br /> contamination has not been adequately defined" and requests additional <br /> assessment activities. <br /> It became apparent to us that you may not have had all technical documents <br /> related to environmental activities at the site. Your letter also <br /> suggested that close evaluation of historical site data was not analyzed. <br /> This letter and attachments present information that we feel is critical <br /> in evaluating the site for closure. <br /> Your letter states that a drop in ground water levels, and subsequent <br /> decrease in hydrocarbon concentrations detected in water samples from the <br /> monitoring wells does not constitute remediation. We could not agree <br /> more. While water levels were at their lowest (September 1989) we <br /> installed and operated a vapor extraction system at the site. Attached to <br /> this letter is the EVAX Technologies report discussing the installation, <br /> operation, and maintenance of their internal combustion engine (ICE) . <br /> As indicated in EVAX's report, during the period of October 11, 1989, <br /> through November 8, 1989, a total of almost 1700 pounds of hydrocarbon <br /> (equivalent to approximately 270 gallons of gasoline) was extracted from <br /> the subsurface through the ICE. We feel very strongly that the operation <br /> of the vapor extraction remediation system is directly responsible for the <br /> decrease in hydrocarbon concentrations found in ground-water monitoring <br /> well samples. <br /> BEACTC0.4N <br /> A Member of the Ultramar Group of Companies #1 Quality and Service <br /> Itramar <br />