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ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> AND <br /> REQUEST FOR"NO FURTHER ACTION" <br /> Facility 5450 Address 1617 W Fremont St,Stockton,Cal ifornta <br /> ARCO Environmental Engineer Mr Paul Supple <br /> Consulting Co/Contact Person Brown and CaldwelUSteve Misner f(916)444-01234 <br /> Consultant Project No 4870 <br /> Pnmary Agency/Regulatory ID No San Joaquin County/Site Code 505663 <br /> WORK PERFORMED THIS QUARTER(First- 1997) <br /> 1 Conducted groundwater monitoring/sampling for first quarter of 1997 Work conducted by Brown <br /> and Caldwell(BC) <br /> 2 Submitted groundwater monitoring report for fourth quarter of 1996 <br /> WORK PROPOSED FOR NEXT QUARTER(Second- 1997) <br /> 1 Submit fust quarter I997 groundwater monitoring report and request for"No Further Action" <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring _ _ __ (Assmnt,remed,etc) <br /> Frequency of Groundwater Sampling MW-I =quarterly (Quarterly,etc) <br /> Frequency of Groundwater Monitoring Quarterly (Monthly,etc} <br /> Is Free Product(FP)Present On-Site No (Yes/no) <br /> FP recovered this quarter None (Gallons) <br /> Cumulative FP recovered to date None (Gallons) <br /> Approximate Depth to Groundwater 889 (Measure feet,below TOC) <br /> General Groundwater Flow Direction Unknown (North,northeast,etc) <br /> Approximate Hydraulic Gradient Unknown (Feet per foot) <br /> DISCUSSION/BACKGROUND AND CLOSURE INFORMATION <br /> ARCO has met the conditions set by PHS-EHD for closure of this site At this time, ARCO is requesting that PHS- <br /> EHD issue"No Further Action"documentation for this site <br /> ARCO Facility 5450 is an operating retail gasoline filling station In October, 1995,ARCO replaced the single-wall <br /> product line and fiber trench secondary containment system with double-wall fiberglass product lines <br /> Hydrocarbons were identified in the soil beneath the product dispensers 91 and #2 during the fiber trench <br /> replacement Approximately 35 cubic yards (in place) of impacted soil were removed from the affected area and a <br /> sample was collected from the base of the excavation (approximately i 1 feet below grade) Very low <br /> concentrations of benzene, toluene, ethylbenzene, and xylenes, were identified at the base of the excavation <br /> Groundwater was not encountered during the excavation The results of this investigation are presented in BC's <br /> "Summary Report of Soil Sampling During Product Piping Replacement, ARCO Facility 5450, Stockton, California", <br /> dated January 24, 1996 Table I presents the results of all soil samples collected at this site <br /> On May 6, 1996, the PHS-EHD issued a letter requesting the installation of one groundwater monitoring well The <br /> May 6, I996, letter states "In order to verify groundwater conditions in the west island area at the northern edge <br /> (Sample T14 area), PHS-EHD will require a groundwater monitoring well to be installed After two consecutive <br /> This report was prepared in accordance ivith the standards of the em.ironmental consulting industry at the time it is as <br /> prepared /t should not be relied upon by parties other than those for ivhom it was prepared and then only to the extent <br /> of the scope of work which ivas authorized This report does not guarantee that no additional environmental <br /> contamination beyond that described to this report exists at the site <br /> 48701REP0PW1 ST97QTR.DOC <br />