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ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Faculty No 2093 Address 3425 Tracv Boulevard Tracy,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 4747 <br /> • Regulatory Agencies/Regulatory ID No Central Valley RWQCB, San Joaquin County <br /> Pilot_Pro¢ram Site 141_6 <br /> WORK PERFORMED THIS QUARTER(Third- 1997) <br /> 1 Conducted groundwater monitoring/sampling for third quarter of 1997 Work conducted by <br /> Brown and Caldwell(BC) <br /> 2 Submitted groundwater monitoring report for second quarter of 1997 <br /> 3 Operated soil vapor extraction and treatment system(SVET) The air spargmg(AS)system did not operate this <br /> quarter <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 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-8,ATR-12,SMW-1 =quarterly, <br /> wells ATR-I,ATR-3,ATR-6, ATR-9, <br />. ATR-10,ATR-11 =semi-annually <br /> (stand 3rd quarters) (Quarterly, etc) <br /> Frequency of groundwater monitoring Quarterly (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 SVETIAS (SVET/AS/FP Removal,etc) <br /> TPH-G removed by SVET this quarter 13 (Pounds) <br /> Cumulative TPH-G removed 2050 (Pounds) <br /> Approximate depth to groundwater 9 10 (ATR-8)to 13 43(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 ATR- <br /> 8 However, free product has not been present in well ATR-8 since July, 1996 Operation and maintenance data for the <br /> remediation system at this site is presented in Appendix A <br /> ATTACHMENTS <br /> Figure 1 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 was 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 ivork <br /> which ivas authorized This report does not guarantee that no additional environmental contamination beyond that described in <br /> this report exists at the site <br /> 47471REPORTS13RD97QTR DOC <br />