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tY <br /> - <br /> CR� <br /> FUGRO WEST, INC. `� = <br /> 1050 MPIPW Lane,Suite 160 <br /> Roser lo,California 95678 <br /> D <br /> Tel (916)782-2110 <br /> FAX (916)786-7830 <br /> April 27, 1995 24� <br /> Rq Y 04 <br /> Mr Dan Kirk p�N � 1995 <br /> Shell <br /> Oil <br /> PostOffice Company <br /> Box 4023 <br /> Concord, California 94524 S <br /> Subject First Quarter 1995 Groundwater Monitonng Repgrt aro <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 February 16, 1995 <br /> The remediation status is also included <br /> Remediation Status <br /> Currently, the soil vapor extraction system is in a "pulsing" mode of operation System <br /> pulsing commenced in September 1993 Pulsing consists of intermittent operation (on/off) <br /> cycles to optimize hydrocarbon recovery due to low Influent concentrations extracted from <br /> the subsurface To date, the amount of total petroleum hydrocarbons (as gasoline) <br /> extracted by soil vapor extraction is estimated at 17,449 pounds (2,908 gallons) <br /> Planned Next Quarter's Acthritieis <br /> The planned next quarter's activities include operation of the soil vapor extraction system, <br /> and groundwater sampling The groundwater sampling will be conducted after purging at <br /> least three well volumes of groundwater from each of the wells Temperature, <br /> conductivity, pH, and turbidity will be measured and/or observed for stability prior to <br /> 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 /> hydrogeologic, and engineering practices at this time and for this specific site Other than <br /> this, no warranty is implied or intended <br /> A member of QV Fugro group of companies with ofGe4 thrYpyohwt the world <br />