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3 <br /> , <br /> , <br /> i <br /> t, ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No.: 434 Address: 501 W. Kettleman Lane, Lodi,California <br /> ARCO Environmental Engineer: Mr. Paul Supple <br /> Consulting Co./Contact Person: Brown and Caldwell/Joel Coffman [(916)444-0123] <br /> Consultant Project No.: 3382 <br /> Primary Agency/Regulatory 1D No.:. CA Central Valley RWQCB, San Joaquin County/Site Code#1341 <br /> WORK PERFORMED THIS QUARTER(Fourth- 1996).- <br /> 1. <br /> 996):1. Conducted groundwater monitoring/sampling for fourth quarter of 1996. Work conducted by Pacific <br /> Environmental Group(PEG). <br /> 2. Submitted groundwater monitoring report for third quarter of 1996. <br /> 3. Met with San Joaquin County to discuss site closure, <br /> WORK PROPOSED FOR NEXT QUARTER(First- 1997): <br /> 1. Submit fourth quarter 1996 groundwater monitoring report. <br /> QUARTERLY RESULTS SUMMARY: <br /> i <br /> Current Phase of Project: Monitoring „(Assmnt., remed., etc.) <br /> i Frequency of Groundwater Sampling: Wells W4A, W-2, W-3, W-4, W-5, and <br /> W-9 = quarterly; wells W-2A, W-2B, <br /> W-7, W-8, W-10, W-11 and W-12 = <br /> semi-annually lst and 3rdquarters) (Quarterly) <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: None (Gallons) <br /> Depth to Groundwater: 61.00 W-8 to 64.02 ft W-9 (Measure feet below TOC) <br /> General Groundwater Flow Direction: Southeast (North, northwest,etc.) <br /> Approximate Hydraulic Gradient: 0.002 (Feet per foot) <br /> DISCUSSION: <br /> See attached tables for historical data. This quarter, low concentrations of petroleum hydrocarbons were detected in <br /> well W-2. During 1996 quarterly sampling events, low concentrations of petroleum hydrocarbons were periodically <br /> detected in certain site wells, including wells that are upgradient or crossgradient from the former source area. <br /> Sampling efforts conducted during the first quarter of 1996 (by PEG) at this and other ARCO sites showed low <br /> concentrations of petroleum hydrocarbons in wells that were historically non-detect for petroleum hydrocarbons. <br /> This report ivas prepared in accordance with 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 tivhom it ivas prepared, and then only to the extent <br /> . of the scope of tivork which ivas authorized This report does not guarantee that no additional environmental <br /> contamination beyond that described in this report exists at the site, <br /> 33 821REP0RTS14THQTR96.DOC <br />