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ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2093 Address 3425 Tracy Boulevard Tracy,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 4747 <br /> Regulatory Agencies/Regulatory ID No Central Valley RWQCB, San Joaquin County <br /> Pilot Program Site 1416 <br /> WORK PERFORMED THIS QUARTER(Fourth- 1997) <br /> 1 Conducted groundwater mon itoring/sam piing for fourth quarter of 1997 Work conducted by <br /> Brown and Caldwell(BC) <br /> 2 Submitted groundwater monitoring report for third quarter of 1997 <br /> 3 Operated soil vapor extraction and treatment system (SVET) The air sparging(AS)system did not operate this <br /> quarter <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 Continue to operate SVET system <br />,) QUARTERLY RESULTS SUMMARY <br /> Current phase of project Monitoring/Soil and Groundwater <br /> Remediation (Assmnt,remed,etc} <br /> Frequency of groundwater sampling Wells ATR-2,ATR-4,ATR-5,ATR-7, <br /> ATR-S, ATR-12,SMW-I =quarterly, <br /> wells ATR-1,ATR-3,ATR-6,ATR-9, <br /> ATR-109 ATR-11 =semi-annually <br /> 1st and 3rd guarters) (Quarterly, etc ) <br /> Frequency of groundwater monitoring QuarterlV (Monthly, etc ) <br /> Is free product(FP)present on-site No (Yes/no) <br /> FP recovered this quarter None (Gallons) <br /> Cumulative FP recovered <l (Gallons) <br /> Current remediation techniques SVET/AS (SVET/AS/FP Removal,etc ) <br /> TPH-G removed by SVET this quarter 21 (Pounds) <br /> Cumulative TPH-G removed 2073 (Pounds) <br /> Approximate depth to groundwater 9 47 ATR-11 to 13 29 ATR-1 (Measure feet below TOC) <br /> General groundwater flow direction Northeast (North, northwest, etc ) <br /> Approximate hydraulic gradient i'002 (Feet per foot) <br /> This report was prepared to accordance with the standards of the environmental consulting industry at the time it lvas prepared It <br /> should not be relied upon by parties other than those for whom it was prepared and then only to the extent of the scope of work <br /> which was authorized This report does not guarantee that no additional environmental contamination beyond that described in <br /> this report exists at the site <br /> 47471REPORTS14TH97QTR DOC <br />