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Du PONT ENVIRONMENTAL REMEDIATION SERVICES <br /> 7068 Koll Center Parkway, Suite 401 <br />' Pleasanton, CA 94566 <br /> (51 0) 462-7772 April 19, 1993 <br /> Fax (510) 462-7944 Job No 0511-42-5010-04 <br /> 1 <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 1993 <br /> Former Econo Gas Station <br /> 4325 East Washington Street <br />' Stockton, California <br /> Dear Ms Thompson <br /> 1.0 INTRODUCTION <br /> This report presents the results of Du Pont Environmental Remediation Services' (DERE) <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 January 29, 1993 The purpose of this sampling program is to <br />' 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 through January 1993 is presented in <br /> Table A In general, groundwater levels at the subject site have nsen app;ox,mately <br /> 0 5 foot since the last quarterly sampling event. The groundwater gradient at the site rs <br /> generally directed toward the southwest at a magnitude of approximately 0.0005 foot per <br />' foot (see the Groundwater Gradient Map, Figure 2) <br /> Better Things For Better Living <br />' 0511 17 Rev 0 <br />