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I <br /> • <br /> Eneir cermg and Conotruction, Inc <br /> April 27, 1994 <br /> Job No 93036 <br /> 1 <br /> Conoco Inc <br /> Room PO - 3038 <br /> P O Box 4784 <br /> IHouston, TX 77210-4784 <br /> ATTENTION- Ms Linda Thompson <br /> Project Manager - Remediation Technology <br /> SUBJECT Quarterly Monitoring Report <br /> Soil Remediation System <br /> January - March 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 December 31, 1993 and <br /> March 31, 1994 Sampling observations and analytical results are reported herein for this quarter only <br /> A Sunnver 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 ale 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 100 standard cubic feet <br /> pei minute The operating efficiency (actual operating time versus the total time in the reporting period) <br /> of the system was 79 percent <br /> 1 <br /> CONOCOV3036VQUARA IZLII <br /> 45014) 0 Mara Avenue Brentwood, California 94513 ■ (510) 516-0162 ■ FAX(510) 516-2649 ■ Contractor's License # 620479 <br />