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DU PONT ENVIRONMENTAL REMEDIATION SERVICES <br /> 7068 Koll Center Parkway, Suite 401 <br />' Pleasanton, CA 94566 <br /> (510) 462-7772 March 6, 1992 <br /> Fax (51 0) 462-7944 Job No 400511-Q19 <br />' Conoco Inc <br /> 600 North Daisy Ashford <br /> TR 3056 <br /> Houston, Texas 77079 <br />' ATTENTION Mr Gregory P Fletcher <br /> Senior Coordinator - Environmental Affairs <br />' SUBJECT Quarterly Report <br /> January - March 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 quarterly <br /> E } <br /> groundwater sampling which was conducted at Conoco Inc's (Conoco) former Econo Gas Station, <br />' located at 4325 East Washgmton Street, Stockton, California (see the Location Map, Figure 1) on <br /> January 28 and 29, 1992 The purpose of this sampling program is to monitor and evaluate the extent- <br /> of hydrocarbon contamination in the groundwater at the site <br /> 2 0 GROUNDWATER SAMPLING SUAWLARY <br /> 21 Summary of Groundwater Elevation Data <br /> A summary of data regarding groundwater levels for January 1992 is presented in Table A In general„ <br /> groundwater levels at the subject site have risen approximately 0 6 foot since the last quarterly sampling <br />' event (October 15, 1991) The groundwater gradient at the site is directed toward the east at a <br /> magnitude of approximately 0 0007 foot per foot (see the Groundwater Gradient Map, Figure 2) <br /> 1 <br /> 22 Summary of Groundwater Analytical Results <br /> Chemical analytical results indicate that dissolved petroleum hydrocarbon constituents exist in the <br /> groundwater at wells MW-29 and MW-30 toward the south and southwest portion of the subject <br /> 1 <br /> Better Things For Better Living <br />