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lP <br /> .} 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)444-01231 <br /> Consultant Project No 477 <br /> Primary Agency/Regulatory ID No Central Valley RWQCB, San Joaqum County/Site <br /> Code 1021 <br /> WORK PERFORMED THIS QUARTER(Second - 1997) <br /> 1 Conducted groundwater monitoring/sampling for second quarter of 1997 Work conducted by Brown <br /> and Caldwell(BC) <br /> 2 Submitted groundwater monitoring report for first quarter of 1997 <br /> 3 Operated air sparging (AS) system Did not operate soil vapor extraction and treatment system <br /> (SVET)due to low influent concentrations <br /> WORK PROPOSED FOR NEXT QUARTER(Third- 1997) <br /> 1 Submit second quarter 1997 groundwater monitoring report <br /> 2 Conduct groundwater monitormg/sampltng for third quarter of 1997 Work to be performed by BC <br /> 3 Continue to operate AS system Restart SVET system, if influent concentrations warrant <br /> QUARTERLY RESULTS SUMMARY <br /> Current phase of project Monrtormp/remediation (SVET/AS) (Assmnt,remed,etc) <br /> Frequency of groundwater sampling E-2, E-8 through E-12, PRA, 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-annualiv <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 642 (Gallons) <br /> Cumulative TPH-G removed by GWETS 3,980 (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 8 38(BHD-1)to 11 17(E-11) (Measure feet,-below TOC) <br /> General groundwater flow direction North northeast to northeast (North, northeast, etc ) <br /> Approximate hydraulic gradient 0.0007 to 0 004 (Feet per foot) <br /> This report was prepared in accordance Yvtth the standards of the entiironmental consulting industry at the time it was <br /> Prepared It should not be relied upon by parties other than those for Yvhom it uas prepared, and then only to the extent <br /> of the scope of work which was authorized This report does not guarantee that no additional environmental <br /> contamination beyond that described in this report exists at the site <br /> 47371REPORTS12ND47QTR DOC <br />