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4 <br /> d <br /> I <br /> S E C 0 R <br /> Date July 15, 2003 <br /> Quarter 2Q03 <br /> I <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 595 Address 6100 N Highway 99, Stockton, CA <br /> Environmental Engineer Paul Supple _ <br /> Consulting Co/Contact Person SECOR/Rusty Benkosk <br /> Consultant Project No 77BP 50595 04 0336 <br /> Primary Agency/Regulatory ID No San Joaquin County Public Health Services <br /> SJCPHS <br /> Assembly BIII 681 Status _Property owned by Madeline Scannavino <br /> WORK PERFORMED THIS QUARTER (Second Quarter— 2003): <br /> 1 Performed groundwater monitoring and sampling (Including onsite water supply well WSW, offsite <br /> water supply well DW-2) <br /> 2 Prepared and submitted March, April, and May monthly system performance summary <br /> 3 Performed study to determine the effect of periodic pumping from onsite water supply well (WSW) <br /> WORK PROPOSED FOR NEXT QUARTER (Third Quarter - 2003). <br /> 1 Perform quarterly groundwater monitoring and sampling (including WSW and DW-2) <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Prepare and submit monthly system performance summary for June, July, and August <br /> 4 Submit letter report documenting the study of the WSW <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring/Offsite Remediation <br /> Frequency of Groundwater <br /> Sampling MW-1 through MW-10, DMW-1 through DMW-3, WSW, <br /> and DW-2 sampled quarterly <br /> DW-1 influent and effluent sampled monthly <br /> Frequency of Groundwater <br /> Monitoring Quarter) <br /> Is Free Product (FP) Present <br /> Onsite No <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Current Remediation Techniques Granular activated carbon treatment on off-site well DW-1 <br /> Approximate Depth to <br /> Groundwater 60 66 to 66 47 ft <br /> Shallow Groundwater <br /> Flow/Gradient Southeast @ 0 002 ft/ft <br /> Deep Groundwater Flow/Gradient Northeast 0 0007 ft/ft <br /> 11 ARM05851QMRs\200312a1V1R03 doc <br />