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T) <br /> ` <br /> S E C O R <br /> wDate _January 13, 2004 <br /> Quarter 4003 <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 Benkosky <br /> Consultant Project No 77BP 50595 04 0336 <br /> Primary Agency/Regulatory ID No San Joaquin County Public Health Services <br /> LSJCPHS} - <br /> Assembly Bill 681 Status Property owned by Madeline Scannavino <br /> WORK PERFORMED THIS QUARTER (Fourth 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 September, October, and November monthly system performance <br /> summary <br /> WORK PROPOSED FOR NEXT QUARTER (First Quarter - 2004): <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 December, January, and February <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 /> Current Remediation Techniques Granular activated carbon treatment on off-site well DW-1 <br /> Approximate Depth to <br /> Groundwater 64 75 to 69 30 ft <br /> Shallow Groundwater <br /> Flow/Gradient Northwest @ 0 003 ft/ft to North @ 0 002—0 007 ft/ft <br /> Deep Groundwater Flow/Gradient Southwest @ 0 003 ft/ft <br /> 1 1ARC010595\QMRs120031401V1R03 doc <br />