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ARCO QUARTERLY GROU&D-WATER MONITORING REPORT <br /> Facility: - 2133 Address: 2908 Ben'amin Holt Dr. Stockton California <br /> :yq► ARCO Environmental Engineer: Mr. Paul Supple <br /> Consulting,Co./C'ontact Person: Brown and Caldwell/Steve Misner[(916)444-01231 <br /> Consultant Project No.: ti 3316 <br /> Y Primary Agencylltegulaiory ID No.: Central Valley_ RWQCB, San Joaquin County/Site <br /> Code 1021 <br /> WORK PERFORMED THIS,QUARTER(Fourth-1996): r <br /> 1. Conducted groundwater monitoring/sampling:for fourth quarter of 1996. Work conducted by Pacific <br /> Envirgpmental Group(PEG). <br /> 2. Submitted groundwater monitoring report for third quarter of 1996. <br /> WORK PROPQSED FOR NEXT QUARTER(First 1997): <br /> L., Submit fourth quarter 1996 groundwater monitoring report. <br /> 21 <br /> Cdh4 no;purge groundwater monitoring/sarnpMg for first quarter of 1997. Work to be performed <br /> byBtQwand Caldwell. <br /> :.'QUARTERI Y.Rf,.$U,LTS SUMMARY: <br /> Current Phase of Project: Monitoring/remediation (air sparging) (Assrnnt.,remed.,etc.) e <br /> ':�Frequeney.:of Groundwater Sampling: E-2,E-8 through IE-12,BHD-1,MW-4, (Quarterly,etc.) <br /> MW-5=quarterly. E-3 through E-7, <br /> PR-I,PR-2,BHD=2,MW-1,MW-2, <br /> MW-3=semi-annually. . <br /> " Freq1uegc •of Groundwater Monitoring: Quarterly <br /> (Monthly,etc.) ! <br /> Is Free Product(FP)Present On-Site: No (Yes/no) i <br /> FP Removed,this Quarter: None (Gallons) <br /> Cumulative FP Recovered to Date: 642 (Gallons) <br /> Total Mass of Gasoline Removed 3-980 (Pounds) <br /> Total Groundwater Extracted 32000,000 _ (Gallons) <br /> Approximate Depth to Groundwater 1.1.29(PR-2)to 13.93(E-11) (Measure feet,below TOC) <br /> General Groundwater Flow Direction: Northeast.to east (North,northeast,etc.) <br /> Approximate Hydraulic Gradient: 0.003 (Feet per foot) <br /> I <br /> DISCUSSION: <br /> -See attached tables for historical data. Appendix A contains the Operations and Maintenance (O&M) report for the l <br /> ;.rerne4liatioti,system. <br /> ": .f <br /> ATTACHMENTS: <br /> �yq <br /> Figure L Groundwater Elevation Map t <br /> Figure2: . . Constituent Concentration Map I <br /> Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> Table 2. Historical Flow Directions and Gradients <br /> h <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 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 /> 33 MREPORTS14TH96QTR.DOC r <br />