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ry <br /> c <br /> r ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> . Facility ZM Address 2908 Benjamw <br /> ARCO Environmental Engineer Mr. Kvie <br /> Consulung Co/Contact PersonBrown and Caldwve _ 2' <br /> Consultant Project No 3Z 16 <br /> Pnmary Agency/Regulatory ID No Central Valley RWQCB,San Joaquin County/Site <br /> Code 1021 <br /> WORK PERFORMED THIS QUARTER(Third- 1996)- <br /> 1 Conducted groundwater monitoring/sampling for third quarter of 1996 Work conducted by Pacific <br /> Environmental Group(PEG) <br /> 2 Submitted groundwater monitoring report for second quarter of 1996 <br /> WORK PROPOSED FOR NEXT QUARTER(Fourth- 1996). <br /> 1 Submit third quarter 1996 groundwater monitoring report <br /> 2 Conduct groundwater monntormg/samplung for fourth quarter of 1996 Work to be performed by PEG <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitorrng/rernedration (airs ar2ing) <br /> R _ (Assmnt, remed,etc) <br /> Frequency of Groundwater Sampling E-2,E-8 through E-12, BHD-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_ <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 to Date 6.42 (Gallons) <br /> Current Remediation Techniques SVETSIAS (SVES/Sparge/FP Removal,etc) <br /> Approximate Depth to Groundwater B H D- 14.45 - (Measure feet, below TOC) <br /> Genera[Groundwater Flow Direction Northrast to e - ut ea (North, northeast,etc) <br /> Approximate Hydraulic Gradient 41,003 _ _ (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 I Summary of Groundwater Monitoring Data Water Elevations and Analyses <br /> Table 2 Historical Flow Directions and Gradients <br /> Appendix A ORM Report <br /> Appendix B Field Data Sheets, Laboratory Reports, and Chain-of-Custody <br /> Documentation <br /> This report ivas prepared in accordance with the standards of the em troamenial consulting industry at the time it was <br /> prepared It should not be relied upon by parties other than those for ►t hoar it was prepared and then only to the extent <br /> of the scope of pork xhich xis authorized This report does not guarantee that no additional environmental <br /> contamination beyond that described in this report exists at the site <br /> 33161REPORT313RD96QTR DOC <br />