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ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facilitv 2133 Address 2908 Bentamin Holt Dr, Stockton California <br /> ARCO Environmental Engineer Mr Paul Supple <br /> Consulting Co/Contact Person Brown and Caldwell/Steve Misner[(91.6)444-0123] <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(First- 1997) <br /> 1 Conducted groundwater mon itoring/sam piing for first quarter of 1997 Work conducted by Brown <br /> and Caldwell(BC) <br /> 2 Submitted groundwater monitoring report for fourth quarter of 1996 <br /> WORK PROPOSED FOR NEXT QUARTER(Second- 1997) <br /> l Submit first quarter 1997 groundwater monitoring report <br /> 2 Conduct groundwater monitoring/sampling for second quarter of 1997 Work to be pertormed by BC <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring remediation (air sparging) (Assmnt remed etc ) <br /> Frequency of Groundwater Sampling E-2, E-8 through E-12, PR-1, BHD-1, (Quarterly, etc ) <br /> MW-4, MW-5 = quarterly E-3 through <br /> E-7, PR-2, BHD-2, MW-I, MW-2, <br /> MW-3=semi-annually <br /> Frequency of Groundwater Monitoring Quarteriv (Monthly, etc ) <br /> Is Free Product(FP) Present On-Site No (Yes/no) <br />. FP Removed this Quarter None (Gallons) <br /> Cumulative FP Recovered to Date 642 (Gallons) <br /> Total Mass of Gasoline Removed 3,980 (Pounds) <br /> Total Groundwater Extracted 32,000,000 _ (Gallons) <br /> Approximate Depth to Groundwater 6 83 PR-2 to 9 50 E-11 (Measure feet, below TOC) <br /> General Groundwater Flow Direction Northeast to east (North, northeast, etc ) <br /> Approximate Hydraulic Gradient 0 005 (Feet per foot) <br /> DISCUSSION <br /> See attached tables for historical data Petroleum hydrocarbons in wells E-2, E-3, E-4, E-6, E-9, E-10, E-11, and <br /> MW-12 are either non-detect for the first time or are significantly lower than previous sampling events <br /> Appendix A contains the Operations and Maintenance(O&M)report for the remediation system <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 Cham-of-Custody Documentation <br /> This report ivas prepared in accordance iiith 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 ivhom it ivas prepared and then only to the extent <br /> of the scope of ivork 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 /> 47571REP0RTS11ST97QTR DOC <br />