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ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No.: 2093 Address: 3425 Tracv Boulevard Tracy. California <br /> ARCO Environmental Engineer: Mr. Paul Supple <br /> Consulting Co./Contact Person: Brown and Caldwell/Steve Misner I(9„16)444-01231 <br /> Consultant Project No.: 3315 <br /> Regulatory Agencies/Regulatory ID No.: Central Valley RWQCB, San Joaquin County <br /> Pilot Program Site 1416 <br /> WORK PERFORMED THIS QUARTER(Fourth- 1996): <br /> 1. Conducted groundwater monitoring/sampling for fourth quarter of 1996. Work conducted by Pacific Environmental <br /> Group(PEG). <br /> 2. Submitted groundwater monitoring report for third quarter of 1996. <br /> 3. Operated SVETS system. <br /> WORK PROPOSED FOR NEXT QUARTER(First- 1997): <br /> 1. Submit fourth quarter 1996 groundwater monitoring report. <br /> 2. Conduct groundwater monitoring/sampling for first quarter of 1997. Work to be performed by PEG or other <br /> ARCO-approved contractor. <br /> 3. Continue to operate SVETS system. <br /> QUARTERLY RESULTS SUMMARY: <br /> Current Phase of Project: Monitoring/Soil and Groundwater <br /> Remediation (Assmnt., remed.,etc.) <br /> Frequency of Groundwater Sampling: Wells ATR-2,ATR-4,ATR-5,ATR-7, <br /> ATR-8,ATR-12,SMW-1 =quarterly; <br /> wells ATRA,ATR-3,ATR-6,ATR-9, <br /> ATR-10,ATR-11 =semi-annually <br /> 1st and 3rd quarters) (Quarterly, etc.) <br /> Frequency of Groundwater Monitoring: Ouarterlv - (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: <1 (Gallons) <br /> Approximate Depth to Groundwater 9.40 ft(ATR-8)to 13.74(ATR-1) (Measure feet below TOC) <br /> General Groundwater Flow Direction: Northeast (North,northwest, etc.) <br /> Approximate Hydraulic Gradient: 0.002 (Feet per foot) <br /> DISCUSSION: <br /> See attached tables for historical data. To date approximately one gallon of free product has been removed from well ATR-8. <br /> However, this quarter, there was no free product present in well ATR-8. Operation and maintenance data for the remediation system <br /> at this site is presented in Appendix A. <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 Chain-of-Custody Documentation <br /> This report was prepared in accordance tivith the standards of the environmental consulting industry at the time it was prepared. It should <br /> not be relied upon by parties other than those for trhom it tivas prepared, and then only to the extent of the scope of ivork u>hich tvas <br /> authorised. This report does not guarantee that no additional environmental contamination beyond that described in this report exists at the <br /> site. <br /> 33 1 51REPORTS14TH96QTR.DOC <br />