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ERI .������t: �-7rr � <br /> s ENVIRONMENTAL RESOLUTIONS INC <br /> i <br /> April 30, 1999 ` <br /> ERI 205504.L04 <br /> Mr. Anthony Mendes <br /> San Joaquin Valley Unified Air Pollution Control District ! <br /> 4230 Kierman Avenue, Suite 130 <br /> Modesto, California 95356 <br />! ---.— <br /> ----Subject.'-- Notification-of-Soa apor Extraction-Test-at-—osco 76-Serv-ice-Station=#5886, <br /> j 2701 March Lane, Stockton, California. <br /> iMr. Mendes: <br /> { <br /> At the request of Tosco Marketing Company (Tosco), Environmental Resolutions, Inc. (ERI) is <br /> notifying your office of the scheduled vapor extraction test at the subject site. The proposed work <br /> includes conducting an up to five-day soil vapor extraction (SVE) test. The purpose of the SVE test is <br /> to evaluate petroleum hydrocarbon and methyl tertiary butyl ether (MTBE) concentrations in the vadose <br /> zone and subsurface characteristics with respect to vapor transport. Data collected during the SVE test <br /> may be used to evaluate hydrocarbon and MTBE removal rates and the SVE radius of influence. ERI <br /> will collect influent soil vapor samples for submittal to a Tosco laboratory for analyses of total <br /> purgeable petroleum hydrocarbons as gasoline (TPPHg), benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX), and MTBE. <br /> The SVE test equipment will consist of a 1.5-horsepower Rotron blower, and associated instruments for <br /> measuring flow, temperature, vacuum and soil vapor concentrations. The vapor stream will be abated <br /> using four 200-pound vapor-phase carbon adsorbers connected in series. The effluent vapor stream <br /> will be monitored hourly using a.photoionization device (PID). ERI will utilize existing on-site <br /> groundwater monitoring wells MW2, and MW3 for SVE and will rotate extraction wells based on the <br /> influent concentrations. The locations of the groundwater monitoring wells are shown on-Platerl,._The <br /> _ , <br /> —--—_ 'work'is`scheduled`to'liegin on May 10-f999: ; <br /> 73 Digital Drive,Suite 100, Novato, California 94949.5791 415.382-9105 (FAX 415-382-1856) <br /> Lake Forest Novato • Seattle <br />