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i <br /> engineering and Conotructlon, Inc.. <br /> July 9, 1993 <br />' Job No 93036 <br />' Conoco, Inc <br />' Room PO - 3038 <br /> P O Box 4784 <br /> Houston, TX 77210-4784 <br />' ATTENTION Ms Linda Thompson <br /> Protect Coordinator - Remediation Technology <br />' SUBJECT Quarterly System Monitoring Report <br /> April - June 1993 <br />' Former Econo Gas Station <br /> Stockton, California <br /> Dear Ms Thompson <br /> This report presents the status of the soil remediation system located at Conoco Inc, 's (Conoco) former <br />' Econo Gas station, 4325 East Washington Street, Stockton, California between April 1, 1993 and June <br /> 30, 1993 This report represents a transfer in responsibility of environmental consultants Sunnver <br /> Engineering & Construction (Sunriver) is Conoco's new consultant as DuPont Environmental <br />' Remediation Services (DERS) has announced the closure of their California office <br /> A Sunrrver or DERS technician visited the site on a weekly basis Typical activities that were performed <br />' during a visit included equipment inspection, instrument calibration, influent and effluent soil vent gas <br /> concentration measurements, and control system adjustments A hand-held flame ionization detector <br /> (FID) was used by the technician to measure the vent gas hydrocarbon concentrations Monthly influent <br />' soil vent gas samples were collected for laboratory analyses A site visit sign-in log was maintained <br /> Laboratory results and chain-of-custody forms are attached in Appendix A <br />' The soil remediation system consists of a series of vapor wells, a vacuum blower, and a thermal <br /> incinerator The removal rate of the soil remediation system is approximately 105 standard cubic feet <br />' per minute The operating efficiency (actual operating time versus the total time in the reporting period) <br /> of the system was 88 percent <br />' 93035qua rep <br />' 4501-D O'Hara Avenue, Brentwood, California 94513 ■ (510) 516-0162 ■ FAX (510) 516-26+9 ■ Contractor's License #620479 <br />