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Mr Chuck Carmel <br /> March 10, 1994 <br /> Page 3 <br /> GWES ARCO wells MW-1 and MW-2 were sampled for the first time during the <br /> November 9, 1993, sampling event <br /> Status of Site Remediation <br /> This section provides a description of the remediation system and discusses the operation <br /> of the remediation system for the fourth quarter 1993 <br /> Description The remediation system at ARCO Station 2133 consists of a GWES The <br /> GWES consists of one groundwater extraction well with a designed pumping capacity of <br /> 15 gallons per minute There is treatment of the extracted groundwater prior to discharge <br /> to the sanitary sewer as per the City of Stockton wastewater discharge permit issued for <br /> this site The system is sampled monthly to ensure the discharge is within peririitted limits <br /> The analytical results are included m Exhibit C Groundwater is extracted from the well <br /> via a submersible pump Installation and start-up of a free product recovery system <br /> occurred in 1984 After the free product was recovered, the system was modified for use <br /> as a GWES and operated periodically from 1986 to 1991 Additional modifications were <br /> made to improve the system in 1991, and it has been operated nearly continuously since <br /> June 1991 <br /> Operating Conditions This Quarter During the fourth quarter of 1993, the system <br /> operated approximately 93 percent of the time During operation of the GWES in the <br /> fourth quarter of 1993, approximately 1 2 million gallons have been extracted and <br /> discharged The total amount of BTEX and TPH in the extracted groundwater is shown <br /> in Table 4 in Exhibit B The quantity of BTEX and TPH discharged to the sewer is well <br /> within the limits stated in the permit <br /> A soil vapor extraction/air sparge system is currently being designed for this site to <br /> enhance the site remediation The system will incorporate the newly installed vapor <br /> extraction and air sparging wells <br /> iUse or disclosure of data contained on this sheet is subject to the restriction specified at the beginn.ng of this <br /> doc ument 03/10/94V453\1 F RTS\4THQTRRPT <br />