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J, <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility 2133 Address 2298 Bei1jamin liglt Dr.. Stock-ton. California <br /> ARCO Environmental Engineer Mr. Kyle Chnstie <br /> Consulting Co/Contact Person Drnym and CaldwelEStever(916)444-0123] <br /> Consultant Project No 3116 ___ <br /> Primary Agency/Regulatory ID No Central Valley RWQCB,San Joaquin County/Site <br /> Code 1021 <br /> WORK PERFORMED THIS QUARTER(Second- 1996). <br /> 1 Conducted groundwater monitoring/sampling for second quarter of 1996 Work conducted by Pacific <br /> Environmental Group(PEG) <br /> 2 Submitted groundwater monitoring report for first quarter of 1996 <br /> 3 Began low flow air spargmg <br /> WORK PROPOSED FOR NEXT QUARTER(Third- 1996): <br /> 1 Submit second quarter 1996 groundwater monitoring report <br /> 2 Conduct groundwater monttormg/samplmg for third quarter of 1996 Work to be performed by PEG <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Mon rtorineremediation (air sparging) (Assmnt,remed,etc) <br /> Frequency of Groundwater Sampling E-2, E-8 through E-12,81ID-1,MW-4, (Quarterly,etc) <br /> MW-5=quarterly E-3 through E-7, <br /> PR-1,PR-2,BHD-2,MW-1,MW-2, <br /> MW-3=semi-annually <br /> Frequency of Groundwater Monitoring Quarterly (Monthly,etc) <br /> Is Free Product(FP)Present On-Site No (Yesino) <br /> Approximate Depth to Groundwater 8.87 (E-10)to 12.05(E-111 (Measure feet,below TOC) <br /> General Groundwater Flow Direction Norlhealt to Casl (North,northeast,etc) <br /> Approximate Hydraulic Gradient 0.004 T^, (Feet per foot) <br /> DISCUSSION <br /> See attached tables for historical data Appendix A contains the Operations and Maintenance (O&M)report for the <br /> remediation system <br /> ATTACHMENTS- <br /> Figure I Groundwater Elevation Map <br /> Figure 2 Constituent Concentration Map <br /> Table 1 Water-Level Elevations <br /> Table 2 Historical Flow Directions and Gradients <br /> Table 3 Analytical Results <br /> Appendix A O&M Report <br /> Appendix B Field Data Sheets, Laboratory Reports, and Cham-of-Custody <br /> Documentation <br /> This report was prepared in accordance with the standards of the environmental consulting industry at the time it was <br /> prepared It should not be relied upon by parties other than those for whom it ivas prepared, and then only to the extent <br /> \ of the scope of work 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 /> 33161REP0RTS12ND96QTR_D0C <br />