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A <br /> February 23, 1994 <br />. <br /> 92-117710234 <br /> Norcal Waste Systems, Inc <br /> Attention: Mr. harry Sweetser, Director of Regulatory Affairs <br /> Subject' GROUNDWATER MONITORING <br /> RESULT'S - November 1993 and January 1994 <br /> Stockton Scavenger Association <br /> Stockton, California <br /> Page 3 <br /> 2R for the benzene, toluene, ethylbenzene, and xylenes (BT EX) components These <br /> decreases in petroleum hydrocarbon concentrations appear to Aco-3d <br /> d from the <br /> implementation of the soil vapor extraction program For wells MW-4, no <br /> significant changes were noted in the groundwater the eve <br /> to previous <br /> sampling results Upgradient well MW-1R continues tono detectable traces of <br /> petroleum hydrocarbons <br /> Soil Vapor Extraction <br /> The Mies oRthe por extraction system indicates that petroleum <br /> hydrocarbons pre sly tested in the upstream vapors prior to removal through the <br /> activated carbon have decreased from initial start-up concentrations of 800 parts per <br /> million (ppm) to 15 ppm Subsequently, soil vapor extraction activities have ceased <br /> Groundwater Extraction <br /> We have conducted initial performance tests on the groundwater extraction program <br /> and are currently waiting for final permitting from the Stockton Municipal Utilities District <br /> A report summarizing the activities conducted at the Stockton Scavenger Association <br /> Facility will be submitted to the San Joaquin County Public Health Services Environmental <br /> Division by May 1, 1994 <br />