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S E C O R <br /> t <br /> • Date April 30, 2004 <br /> Quarter 1 Q04 <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/Clinton Harms <br /> Consultant Project No 77BP 50595 04 0336 <br /> Primary Agency/Regulatory ID No San Joaquin County Public Health Services <br /> (SJCPHS) _ <br /> Assembly Bill 681 Status Property owned by Madeline Scannavino <br /> WORK PERFORMED THIS QUARTER (First Quarter W- 2004): <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 January, February, and March monthly system performance summary <br /> 3 Maintained water treatment system at Wemerschnitzel <br /> WORK PROPOSED FOR NEXT QUARTER (Second 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 /> 4 Prepare and submit a Site Conceptual Model and work plan for additional site assessment <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring/Offsite Remediation <br /> Frequency of Groundwater <br /> Sampling MW-1 through MW-10, DMWA 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 80 to 68 63 ft <br /> Shallow Groundwater <br /> Flow/Gradient Northeast @ 0 001 ft/ft to west 0 0 0001 ft/ft <br /> Deep Groundwater Flow/Gradient Southwest @ 0 001 ft/ft <br /> DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline (TPHg) were reported in five of the ten monitoring wells <br /> sampled this quarter at concentrations ranging from 58 parts per billion (DMW-1) to 3,000 ppb (MW-1) <br /> Benzene was reported in three of the ten monitoring wells sampled at a concentrations ranging from 0 68 <br /> ppb (MW-2) to 860 ppb (MW-1) Methyl tert-butyl ether (MtBE), analyzed using EPA Method 8260B, was <br /> detected In seven of the ten wells sampled at concentrations ranging from 0 58 ppb (MW-5) to 89 ppb <br /> (DMW-3) 1,2-dichloroethane (1,2-DCA) was reported in six of the ten monitoring wells at concentrations <br /> I WRC 0W5951QMR81200411OMR04 dcc <br />