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n <br /> 1�f <br /> ORO <br /> r <br /> FUGRO WEST, INC. <br /> 1050 Melody Lane, Suite 160 <br /> Roseville California 95678 <br /> Tel (916) 782-2110 <br /> FAX (916) 786-7830 <br /> January 25, 1995 <br /> Mr Dan Kirk <br /> Shell Oil Company <br /> Post Office Box 4023 <br /> Concord, California 94524 <br /> Subject Third Quarter 1994 Groundwater Monitoring Report and <br /> Remediation Status <br /> Shell Service Station (WIC No 204-7524-4305) <br /> 620 West Charter Way, Stockton, California <br /> Dear Mr Kirk <br /> Fugro West, Inc is pleased to provide this report documenting the results of quarterly <br /> groundwater monitoring conducted by Blaine Tech Services, Inc on August 16, 1994 <br /> at the subject site <br /> Currently, the soil vapor extraction system is in a "pulsing" mode of operation <br /> System pulsing commenced in September 1993. Pulsing consists of intermittent <br /> operation (on/off) cycles to maximize hydrocarbon recovery due to low influent <br /> concentrations to the oxidizer As of August 23, 1994, the amount of total petroleum <br /> hydrocarbons Sas gasoline) extracted from the soil is estimated at 17,200 pounds <br /> (2,752 gallons) The planned activities next quarter include continued operation of the <br /> soil vapor extraction system and quarterly groundwater sampling. The groundwater <br /> sampling will be conducted after purging at least three well volumes of groundwater <br /> from each of the wells Temperature, conductivity, pH, and turbidity will be measured <br /> and/or observed for groundwater stability parameters prior to sampling <br /> The interpretations and/or conclusions that may be contained within the attachments <br /> represent our professional opinions These opinions are based on currently available <br /> Information and were developed in accordance with currently accepted geologic, <br /> r hydrogeologic, and engineering practices at this time and for this specific site Other <br /> than this, no warranty is implied or intended <br /> 91 246KQMR <br /> A member of the Fugro group of companies with offices throughout the world <br />