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' U <br /> _ ENVIRONMENTAL RESOLUTIONS, INC. <br /> Kra a <br /> - cla <br /> r. November 10 , 1998 <br /> ERI 2055.1,02 <br /> _Mr. En bony Mendes <br /> San Joaquin Valley Unified Air Pollution Control District <br /> 4230 Kierman Avenue, Ste. 130 <br /> Modesto, California 95356 <br /> Subject: Notification of Vapor Extraction Test at Tosco 76 Service Station # 5886, <br /> r <br /> „=— �Od Mareh=Isare—Stdckton C— <br /> 2atifornia, <br /> Mr. Mendes: <br /> At the request of Tosco Marketing Company, (Tosco), Environmental Resolutions. Inc. (ERI) is <br /> notifying your office of the scheduled vapor extraction test to be performed at 2701 March Lane, <br /> Stockton, California. The proposed work includes conducting an extended soil vapor extraction test <br /> for up to one week in duration. The purpose of the test is to evaluate methyl tertiary butyl ether <br /> (MTBE) concentrations in the vadose zone and subsurface characferisc•cs with respect to vapor <br /> transport. Data from the test maybe used to evaluate whether concentrations of NITBE in the vapor- <br /> phase are being removed, optimal flow rates, and the radius of influence associated with the selected <br /> air flow rates. ERI will periodically collect influent vapor samples for subminal to Tosco's contract <br /> laboratory for analyses for TPHg, BTEX, and MTBE. <br /> The vapor extraction test equipment will consist of a 1.5 horse power Rotron blower. three 200- <br /> pound vapor-phase carbon vessels for abatement, and associated instruments for measuring flow, <br /> temperature, vacuum and hydrocarbon vapor concentrations. ERI will utilize existing onsite wells <br /> (MW2, and MW3) for vapor extraction and will rotate extraction wells based on the influent <br /> concentrations. The location of the wells are shown on the attached Map of Area. The work is <br /> scheduled to commence on November 16, 1998 with an anticipated duration of up to five days. <br /> Vapor extraction will occur approximately 12 hours per day. <br /> r <br /> 74 Digital Drive,Suite 6, Novato, California 94949 415.382-9105 (FAX 415-382-1856) <br /> Lake Forest • Novato • Seattle <br />