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l� 4 <br /> S E C 0 R <br /> Date October 27, 2003 <br /> Quarter 3Q03 <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/Rusly Benkosk <br /> Consultant Protect No 77BP 50595 04 0336 <br /> Primary Agency/Regulatory ID No San Joaquin County Public Health Services <br /> SJCPH5 <br /> Assembly Bill 681 Status Property owned by Madeline Scannavino <br /> WORK PERFORMED THIS QUARTER (Third 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 June, July, and August monthly system performance summary <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 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 September, October, and November <br /> 4 Submit letter report documenting the influence study of the WSW, and onsite Ground water levels <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Protect 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 Quarterly <br /> Is Free Product (FP) Present <br /> Onsite No <br /> Current Remediation Techniques Granular activated carbon treatment on off-site well DW-1 <br /> Approximate Depth to <br /> Groundwater 62 89 to 66 82 ft <br /> Shallow Groundwater <br /> Flow/Gradient Northwest 0 01 ft/ft to West/southwest @ 0 04 ft/ft <br /> Deep Groundwater Flow/Gradient North 0 001 ft/ft <br /> I\ARC0105951QMRs0003MMR03 doc <br />