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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 CoJContact Person Brown and Caldwell/Steve Misner f(916)444-0123 <br /> Consultant Project No 4747 <br /> Regulatory Agencies/Regulatory ID No Central Valley RWQCB, San Joaquin County <br /> Pilot ProgMm Site I416 <br /> WORK PERFORMED THIS QUARTER(Second- 1997) <br /> 1 Conducted groundwater monitoring/sampling for second quarter of 1997 Work conducted by <br /> Brown and Caldwell(BC) <br /> 2 Submitted groundwater monitoring report for first quarter of 1997 <br /> 3 Operated soil vapor extraction and treatmentlair sparging SVET/AS systems <br /> WORK PROPOSED FOR NEXT QUARTER(Third- 1997) <br /> 1 Submit second quarter 1997 groundwater monitormg report <br /> 2 Conduct groundwater monitoring/sampling for third quarter of 1997 Work to be performed by BC <br /> 3 Continue to operate SVET/AS systems <br /> QUARTERLY RESULTS SUMMARY. <br /> Current phase of protect 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-8,ATR-12,SMW-1 =quarterly, <br /> wells ATR-1,ATR-3,ATR-6,ATR-9, <br /> ATR-10,ATR-11 =semi-annually <br /> 1st and 3rd uarters) (Quarterly,etc) <br /> Frequency of groundwater monitoring uarterl (Monthly,etc) <br /> Is free product(FP)present on-site No (Yes/no) <br /> FP recovered this quarter None (Gallons) <br /> Cumulative FP recovered <1 (Gallons) <br /> Current remediation techniques SVET/AS (SVET/AS/FP Removal,etc) <br /> TPH-G removed by SVET this quarter 45 (Pounds) <br /> Cumulative TPH-G removed 2037 (Pounds) <br /> Approximate depth to groundwater 8 69(ATR-81 to 13 04(ATR-1) (Measure feet below TOC) <br /> General groundwater flow direction Northeast (North,northwest,etc) <br /> Approximate hydraulic gradient 0 002 (Feet per foot) <br /> DISCUSSION <br /> See attached tables for historical data To date approximately one gallon of free product has been removed from well <br /> ATR-8 However, free product has not been present in well ATR-8 since July, 1996 Operation and maintenance data for <br /> the remediation system at this site is presented in Appendix A <br /> ATTACHMENTS. <br /> Figure I Groundwater Elevation Map <br /> Figure 2 Constituent Concentration Map <br /> Table 1 Summary of Groundwater Monitoring Data Water Elevations and Analyses <br /> Table 2 Historical Flow Directions and Gradients <br /> Appendix A O&M Report <br /> Appendix B Field Data Sheets,laboratory Reports,and Chain-of-Custody Documentation <br /> This report ivas prepared in accordance ivith the standards of the environmental consulting industry at the time it ivas 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 /> 47471REPORTSUND97QTR DOC <br />