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A. ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No.: 434 Address: 501 W. Kettleman Lane,Lodi, California <br /> ARCO Environmental Engineer: Mr. Kyle Christie <br /> Consulting Co./Contact Person: Brown and Caldwell/Joel Coffman [(916)444-01233 <br /> Consultant Project No.: 3382 <br /> Primary Agency/Regulatory ID No.: CA Central Valley RWQCB, San Joaquin County/Site Code#1341 <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 /> 3. Submitted request for site closure. <br /> WORK PROPOSED FOR NEXT QUARTER(Fourth - 1996): <br /> 1. Submit third quarter 1996 groundwater monitoring report. <br /> 2. Conduct groundwater monitoring/sampling for fourth quarter of 1996. Work to be performed by PEG. <br /> 3. Meet with San Joaquin County to discuss Site closure. <br /> QUARTERLY RESULTS SUMMARY: <br /> Current Phase of Project: Monitoring (Assmnt.,remed., etc.) <br /> Frequency of Groundwater Sampling: Wells W-IA, W-2, W-3, W-4, W-5, and <br /> W-9 = quarterly; wells W-2A, W-213, <br /> W-7, W-8, W-10, W-11 and W-12 = <br /> semi-annually(1st and 3rd quarters) (Quarterly) <br /> Frequency of Groundwater Monitoring: Quarterly (Monthly,etc.) <br /> Is Free Product(FP) Present On-Site: No (Yes/no) <br /> Depth to Groundwater: 63.07(W-8)to 66.00 ft(W-9) (Measure feet below TOC) <br /> General Groundwater Flow Direction: South (North, northwest,etc.) <br /> Approximate Hydraulic Gradient: 0.003 (Feet per foot) <br /> DISCUSSION: <br /> See attached tables for historical data. <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 (notably toluene and xylenes) in wells that were historically non-detect <br /> for petroleum hydrocarbons. During the first quarter of 1996, low concentrations of petroleum hydrocarbons <br /> (predominately toluene and xylenes) were detected in ARCO Facility 434 wells WAA, W-2, W-213, W-5, W-9, <br /> This report ivas prepared in accordance ivith the standards of the environmental consulting industry at the time it was <br /> • prepared. 11 should not be relied upon by parties other than those for ivhom it was prepared, and then only to the extent <br /> of the scope of work 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 /> 33821REPORTSI3RDQTR96.DOC <br />