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1 <br /> DU PONT ENVIRONMENTAL REMEDIATION SERVICES <br /> 7068 Koll Center Parkway, Suite 401 <br /> ' Pleasanton, CA 94566 May 7, 1993 <br /> (S 10) 462-7772 Job No 0511-42-5010-04 <br /> Fax (510) 462-7944 <br /> Conoco Inc <br />' 600 North Dairy Ashford <br /> PO 3038 <br />' Houston, Texas 77079 <br /> ATTENTION Ms Linda Thompson <br /> Project Coordinator - Remediation Technology <br />' SUBJECT. Quarterly Monitoring Report <br /> January - March, 1993 <br /> Former Econo Gas Station <br /> 4325 East Washington Street <br /> Stockton, California <br /> Dear Ms Thompson. <br /> This report presents the status of the soil remediation system located at Conoco Inc 's <br /> (Conoco) former Econo Gas Station, 4325 East Washington Street, Stockton, California <br />' between December 30, 1992 and March 30, 1993. A Du Pont Environmental <br /> Remediation Services (DERS) technician visited the site on a weekly basis. Typical <br />' activities that were performed during a visit included equipment inspection, instrument <br /> calibration, influent and effluent soil vent gas concentration measurements, and control <br /> system adjustments A hand-held organic vapor analyzer (OVA) was used by the <br />' technician to measure the vent gas hydrocarbon concentrations. Monthly influent soil <br /> vent gas samples were collected for laboratory analyses. DERS maintained a site visit <br />' sign-in log 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 <br />' a thermal incinerator. The removal rate of the soil remediation system is approximately <br /> 105 standard cubic feet per minute The operating efficiency tactual operating time <br /> versus the total time in the reporting period) of the system was 79 percent The system <br /> was shut down several times during this reporting period for implementation of our vapor <br /> optimization plan and regular maintenance activities. <br /> I <br /> Better Things For Better Living <br /> 0511 18 <br />