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ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility 54o Address 1617 W. Fremont at. Stockton,_California T <br /> ARCO Environmental EngineerChristie <br /> Consulting Co/Contact Person Brown and CaldwelUSteve Misner[(916)444-01231 <br /> Consultant Project No 4336 <br /> Primary Agency/Regulatory ID No San Joaquin County/Site Code 505663 <br /> WORK PERFORMED THIS QUARTER(Fourth-1996) <br /> 1 Conducted groundwater monitoring/samplmg for fourth quarter of 1996 Work conducted by Pacific <br /> Environmental Group(PEG) <br /> 2 Submitted groundwater monitoring report for third quarter of 1996 <br /> WORK PROPOSED FOR NEXT QUARTER(First-1997) <br /> 1 Submit fourth quarter 1996 groundwater monitoring report <br /> 2 Conduct groundwater monttormg/sampling for first quarter of 1997 Work to be performed by PEG or <br /> other ARCO-approved contractor <br /> 3 Prepare closure documentation including completion of Appendix B of the Tri-Regional Guidelines <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring (Assmnt,remed,etc} <br /> • Frequency of Groundwater Sampling MWA =quarterly (Quarterly,etc) <br /> Frequency of Groundwater Monitoring Quarterly (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 (Gallons) <br /> Approximate Depth to Groundwater 1237 (Measure feet,below TOC) <br /> General Groundwater Flow Direction Unknown (North,northeast,etc) <br /> Approximate Hydraulic Gradient Unknown (Feet per foot) <br /> DISCUSSION <br /> See attached table for historical data Based on the results of the well sampling to date (third and fourth <br /> quarter 1996), groundwater beneath the site has not been significantly impacted by petroleum hydrocarbons A <br /> May 6, 1996 letter to ARCO from the San Joaquin County Public Health Services Environmental Health Division <br /> (PHS-EHD) stated that after two consecutive quarterly reports have been received and evaluated, PHS-EHP will <br /> make a decision as to the future need for this well ARCO is requesting that PHS-EHP evaluate this site for closure <br /> ATTACHMENTS <br /> Figure 1 Constituent Concentration Map <br /> Table I Summary of Groundwater Monitoring Data Water Elevations and Analyses <br /> Appendix A Field Data Sheets, Laboratory Reports,and Cham-of-Custody Documentation <br /> This report was prepared to accordance tivtth the standards of the envtronmental consulting industry at the time it was <br /> prepared It should not be relied upon by parties other than those for whom it ioas 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 to this report exists at the site <br /> 43361REPORTS14TH96QTR DOC I <br /> V <br />