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i <br /> ARCO QUARTERLY GROUNDWA�'- _ � <br /> ��MONITORING REPORT <br /> Facility No:1 7093 Addregg! - T <br /> ��2� Tliiir otilevar Trac California <br /> ARCO Environmental Engineer: Mr. Paul Su Ie 1� <br /> Consulting Co./Contact Person: Brown and Caldwell/Steve Misner 916 44-0123 <br /> Consultant Project No.: 4747 fi <br /> Regulatory Agencies/Regulatory ID No.: Central Valley RWQCB, San Joaquin County <br /> Pilot Frotr am Site 141:6 <br /> t WORK PERFORMED THIS QUARTER(First- 1997): ' <br /> 1. Conducted groundwater monitoring/sampling for first qua <br /> of 1997. Work conducted b <br /> !� y Brown and Caldwell. <br /> 2. Submitted groundwater monitoring report for fourth qua titer of 1996. ' <br /> I <br /> 3. Operated SVETS system. <br /> 1 WORK PROPOSED FOR NEXT QUARTER(Second- 1997): E. <br /> I. Submit first quarter 1997 groundwater monitoring report <br /> 2. Conduct groundwater monitoring/sampling for second quarter of 1997. Work to be performed by BG. <br /> 3. Continue to operate SVETS system. i <br /> QUARTERLY RESULTS SUMMARY: <br /> Current Phase of Project: Monitoring/Soil and Groundwater t <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 ATR-1,ATR-3,ATR-6,ATR-9, <br /> ATR-10,ATR-I1 =semi-annually <br /> (Ist and rd quarters) 11 <br /> (Quarterly, etc.) ' <br /> I Frequency of Groundwater Monitoring: Quarterly _ �i (Monthly, etc.) <br /> Is Free Product(FP)Present On-Site: No ;i (Yes/no) <br /> FP Recovered this Quarter: None ii (Gallons) <br /> Cumulative FP Recovered to Date: <1 .!I (Gallons) <br /> Approximate Depth to Groundwater 9.24 ft ATR-$ to 13.68-LA <br /> TR-1 (Measure feet below TOC) <br /> General Groundwater Flow Direction: East !I (North,northwest,etc.) <br /> Approximate Hydraulic Gradient: 0.003 A; (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. f <br /> However, free product has not been present in well ATR-8 since July, 1996. Operation and maintenance data for the remediation <br /> 4 system at this site is presented in Appendix A. 1p i <br /> ATTACHMENTS: I9 <br /> � I <br /> Figure 1. Groundwater Elevation Map <br /> Figure 2. Constituent Concentration Map <br /> Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses t <br /> Table 2. Historical Flow Directions and Gradients I <br /> Appendix A. O&M Report <br /> f <br /> Appendix B. Field Data Sheets,Laboratory Reports,and Chain-of-Custody Documentation <br /> This report was prepared in accordance ivith 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 whom it was prepared, aid then only to the extent of the scope of work which was <br /> authorized. This report does not guarantee that no additional environmental contamination beyond that described in this report exists at the <br /> site. <br /> 47471REPORTS11ST97QTR.DOC <br /> II <br />