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ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> w� <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 r(916)444-01231 <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(Third- 1997) <br /> 1 Conducted groundwater monitonng/sampling for third quarter of 1997 Work conducted by Brown <br /> and Caldwell(BC) <br /> 2 Submitted groundwater monitoring report for second 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(Fourth- 1997) <br /> 1 Submit third quarter 1997 groundwater monitoring report <br /> 2 Conduct groundwater monitoring/sampling for fourth quarter of 1997 Work to be performed by BC <br /> 3 Continue to operate AS system Restart SVET system, of influent concentrations warrant <br /> QUARTERLY RESULTS SUMMARY <br /> Current phase of project Monitoring/remediation (SVET/AS) (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 Ouarterly _ (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/ASIFP 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 9 36 BHD-1)to 12 64 E-11 (Measure feet,below TOC) <br /> General groundwater flow direction North northeast to northeast (North,northeast,etc ) <br /> Approximate hydraulic gradient 0 0004 to 0 007 (Feet per foot) <br /> This report ivas prepared in accordance with the standards of the environmental consulting industry at the time it ivas <br /> prepared It should not be relied upon by parties other than those for whom it tivas prepared and then only to the extent <br /> of the scope of work tivhich ivas authorized This report does not guarantee that no additional environmental <br /> contamination beyond that described in this report exists at the site <br /> 47571REPORTS13ItD97QTR DOC <br />