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ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> S <br /> Facility No 2093 Address 3425 Tracy Boulevard.Tracy.California _ <br /> ARCO Environmental Engineer Mr, Kyle Christie _ <br /> Consulting Co/Contact Person Brown and Caldwell/Steve Misner[(916)444-0123 <br /> Consultant Project No 3315 <br /> Regulatory Agencies/Regulatory ID No Central Valley RWQCB, San Joaquin County <br /> Pilot Pro2rarn141 <br /> WORK PERFORMED THIS QUARTER(Third - 1996) <br /> 1 Conducted groundwater monitoring/sampling for third quarter of 1996 Work conducted by <br /> Pacific Environmental Group(PEG) <br /> 2 Submitted groundwater monitoring report for second quarter of 1996 <br /> 3 Operated SVETS system <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 <br /> PEG <br /> 3 Continue to operate SVETS system <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring/Soil and Groundwater (Assmnt, remed,etc} <br /> Remediation <br />. Frequency of Groundwater Sampling Wells ATR-2,ATR-4,ATR-5,ATR-7, <br /> ATR-8,ATR-12, SMW-1 =quarterly, <br /> wells ATR-1,ATR-3,ATR-6,ATR-9, <br /> ATR-10,ATR-1I =semi-annually <br /> (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 /> Approximate Depth to Groundwater 8 95 ft(ATR-8)to 13 28(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 <br /> well ATR-8 Operation and maintenance data for the remediation system at this site is presented in Appendix A <br /> ATTACHMENTS <br /> Figure 1 Groundwater Elevation Map <br /> Figure 2 Constituent Concentration Map <br /> Table I 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 Chain-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 was 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 /> 33151REPORTS13RD96QTR DOC <br />