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1 J <br /> r` <br /> lfit <br /> 01Ig! 1111111111111111111111111111 1 <br /> • <br /> Engineering and Conotruc ion, Inc. <br /> January 3, 1994 <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 />' Project Manager - Remediation Technology <br /> SUBJECT Quarterly Monitoring Report <br />' Soil Remediation Sy stem <br /> October - December 1993 <br /> Former Econo Gas Station <br /> Stockton, Calitornia <br /> Dear Ms Thompson <br /> This report presents the status of the soil remediation system located at Conoco Inc 's (Conoco) tormvr <br /> Econo Gas station, 4325 East Washington Street, Stockton, California between October 1, 1993 and <br /> December 30, 1993 Sampling observations and analytical results are reported herein for this quarter <br /> only. <br />' A Sunriver technician visited the site on a weekly basis Typical activities that were performed during <br /> 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 A site visit sign- <br /> in log was maintained Laboratory results and chain-of-custody forms are attached in Appendix A <br /> Ttie 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 ±10% sta�idard cubic <br />' feet per minute The operating efficiency (actual operating time versus the total time in the reporting <br /> period) of the system was 81 percent <br /> i <br /> CONOCO\93036\QUASOL'.3 NLP <br /> 1 4501-1) O'Hara Avenue, Brentwood, California 94513 ■ (510) 516-0162 ■ FAX(510) 516-2649 ■ Contractor's License # 620479 <br />