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1 <br /> • <br /> Engineering and Construction, Inc <br />' October 12, 1994 <br /> Job No 93036 <br /> 1 Conoco Inc <br /> Room PO - 3038 <br /> P O Box 4784 <br />' Houston, TX 77210-4784 <br />' ATTENTION Ms Linda Thompson <br /> Project Manager - Remediation Technology <br />' SUBJECT Quarterly Monitoring Report <br /> Soil Remediation System <br /> July - September 1994 <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 July 1, 1994 and September <br /> 30, 1994 Sampling observations and analytical results are reported herein for this quarter only <br /> 1 A Sunriver technician visited the site on a weekly basis Typical activities that were performed during a visit <br /> included equipment inspection, instrument calibration, influent and effluent soil vent gas concentration <br /> measurements, and control system adjustments A hand-held flame ionization detector (FID) was used by <br />' the technician to measure the vent gas hydrocarbon concentrations 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 incinerator <br /> The removal rate of the soil remediation system is approximately 100 standard cubic feet per minute The <br />' operating efficiency (actual operating time versus the total time in the reporting period) of the system was <br /> 83 percent <br /> CONOCO193036136QS0194 RCP <br /> 4501-D O'Hara Avenue, Brentwood, California 94513 ■ (510) 516-0162 ■ FAX (510) 516-2649 ■ Contractor's License # 620479 <br />