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ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> • Facility 2133 Address 2908 Benjamin Holt Dr Stockton California <br /> ARCO Environmental Engineer Mr Paul Supple <br /> Consulting Co/Contact Person Brown and Caldwell/Steve Misner((916)444-0123 <br /> Consultant Project No 4757 <br /> Primary Agency/Regulatory ID No Central Valley RWQCB, San Joaquin County/Site <br /> Code 1021 <br /> WORK PERFORMED THIS QUARTER(Fourth- 1997) <br /> 1 Conducted groundwater monitoring/sampling for fourth quarter of 1997 Work conducted by Brown <br /> and Caldwell (BC) <br /> 2 Submitted groundwater monitoring report for third quarter of 1997 <br /> 3 Operated air sparging (AS) system AS system shut down on November 12, 1997 due to burned-out <br /> motor Did not operate soil vapor extraction and treatment system (SVET) due to low influent <br /> concentrations and high groundwater levels <br /> WORK PROPOSED FOR NEXT QUARTER(First- 1998) <br /> 1 Submit fourth quarter 1997 groundwater monitoring report <br /> 2 Conduct groundwater monitoring/sampling,for first quarter of 1998 <br /> 3 Restart AS system Restart SVET system, if influent concentrations warrant <br /> QUARTERLY RESULTS SUMMARY <br /> Current phase of project Monitoring/remediation (SVET/ASS (Assmnt, remed ,etc) <br /> Frequency of groundwater sampling E-2, E-8 through E-12, PR-I, BHD-1, (Quarterly, etc) <br /> MW-4, MW-5 = quarterly E-3 <br /> through E-7, PR-2, BHD-2, MW-1, <br /> MW-2, MW-3=semi-annually <br /> Frequency of groundwater monitoring Quarterly (Monthly, etc) <br /> Is free product(FP)present on-site No (Yes/no) <br /> FP removed this quarter None (Gallons) <br /> Cumulative FP recovered 624 (Gallons) <br /> Cumulative TPH-G removed by GWETS 3980 (Pounds) <br /> Total groundwater extracted 32,000,000 (Gallons) <br /> Current remediation techniques SVET/AS (SVET/AS/FP Removal, etc) <br /> TPH-G removed by SVET this quarter 0 (Pounds) <br /> Cumulative TPH-G removed by SVET 4815 (Pounds) <br /> Approximate depth to groundwater 10 12(PR-2)to 12 85 (E-11) (Measure feet,below TOG) <br /> General groundwater flow direction North northeast to northeast (North, northeast,etc) <br /> Approximate hydraulic gradient 0 0006 to 0 005 (Feet per foot) <br /> This report was prepared in accordance with the standards of the environmental consulting industry at the time it was <br /> prepared It should not be relied upon by parties other than those for iPhom it was prepared and then only to the extent <br /> of the scope of work which was authori_ed This report does not guarantee that no additional environmental <br /> contamination beyond that described in this report exists at the site <br /> 47571REPORT514Ti-i97QTR DOC <br />