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DU PONT ENVIRONMENTAL REMEDIATION SERVICES <br /> 7068 Koll Center Parkway, Suite 401 <br /> Pleasanton, CA 94566 <br /> (510) 462-7772 January 22, 1993 <br /> Fax (510) 462-7944 Job No 0511-41-6090-02 <br /> Conoco Inc <br />' 600 North Dairy Ashford <br /> MO 3018 <br /> Houston, Texas 77079 <br /> ATTENTION Mr Gregory P Fletcher <br /> Senior Coordinator - Environmental Affairs <br /> SUBJECT. Quarterly Monitoring Report <br /> December 1992 <br />' Former Econo Gas Station <br /> 4325 East Washington Street <br /> Stockton, California <br /> Dear Mr Fletcher <br /> 1 0 INTRODUCTION <br />' This report presents the results of Du Pont Environmental Remediation Services' (DERS) <br />' quarterly groundwater sampling which was conducted at Conoco Inc 's (Conoco) former <br /> Econo Gas Station, located at 4325 East Washington Street, Stockton, California (see the <br /> Location Map, Figure 1) on December 16, 1992 The purpose of this sampling program is <br />' to monitor and evaluate the extent of hydrocarbon contamination in the groundwater at the <br /> site <br /> 2 0 GROUNDWATER SAMPLING SUMMARY <br /> 2 1 Summary of Groundwater Elevation Data <br />' A summary of data regarding groundwater levels for December 1992 is presented in Table <br /> A In general, groundwater levels at the subject site have fallen approximately 2 7 feet <br /> since the last quarterly sampling event The groundwater gradient at the site is generally <br /> directed toward the south at a magnitude of approximately 0 0003 foot per foot (see the <br /> Groundwater Gradient Map, Figure 2) <br /> Better Things For Better Living <br /> 0511 14 Rev 0 <br />