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{ Mr Chuck Carmel <br /> September b, 1994 <br /> Page 3 <br /> a GWES and operated periodically from 1985 to 1991 Additional modifications were made <br /> to improve the system in 1991, and it has been operated nearly continuously since June 1991 <br /> Operating Conditions This Quarter During the second quarter of 1994, the system <br /> operated 100 percent of the time During operation of the GWES in the second quarter of <br /> 1994, approximately 1 15 million gallons were extracted and discharged The total amount <br /> of BTEX and TPH in the extracted groundwater is shown in Table 4 The quantity of B= <br /> and TPH discharged to the sewer is well within the limits stated to the permit <br /> A soil vapor extraction/air sparge system has been designed for this site to enhance the site <br /> remediation The system will incorporate the newly installed vapor extraction and air sparging <br /> wells ARCO has awarded a construction contract for the installation of the soil vapor <br /> extraction/air sparge system, and construction should begin in the third quarter of 1994 <br /> SUMMARY OF WORK <br /> Work Completed in Second Quarter 1994 <br /> • Continued monitoring of the GWES, including sampling of the system <br /> • Prepared and submitted first quarter 1994 groundwater monitoring and remediation <br /> system evaluation report. <br /> • Sampled site groundwater momtonng wells for second quarter 1994. Sampling <br /> performed by GTI <br /> • Prepared work plan for installing new soil vapor extraction and spargrng wells at the <br /> site <br /> • Prepared wastewater discharge report to the City of Stockton <br /> Work Anticipated During Third Quarter 1994 <br /> • Continue monitoring and optimizing of the GWES, including sampling of the system. <br /> Reduce the pumping rate of the extraction well to approximately 8 gpm <br /> • Prepare and submit second quarter 1994 groundwater monitoring and remediation <br /> system evaluation report <br /> Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this <br /> document <br /> 12731R.EP0RTSUND94Q7R.RPr <br />