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S E C 0 R <br /> Date June 28, 2004 <br /> Quarter 2Q04 <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 Protect 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 Scannavano <br /> WORK PERFORMED THIS QUARTER (Second Quarter — 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 April, May, and June monthly system performance summary <br /> 3 Maintained water treatment system at Weinerschnitzel <br /> 4 Submitted Work Plan forAddrtional Site Assessment dated May 6, 2004 <br /> WORK PROPOSED FOR NEXT QUARTER (Third 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 Conduct additional site assessment pending receipt of access agreement <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 58 to 68 21 ft <br /> Shallow Groundwater <br /> Flow/Gradient Northeast Q 0 004 ft/ft to southeast Q 0 002 ft/ft <br /> Deep Groundwater Flow/Gradient South @ 0 001 ft/ft <br /> DISCUSSION. <br /> Total petroleum hydrocarbons as gasoline (TPHg) were reported in one of the eleven monitoring wells <br /> sampled this quarter at a concentration of 310 parts per billion (DMW-3) Benzene was reported in two of <br /> • the eleven monitoring wells sampled at a concentrations of 0 56 ppb (MW-2) to 1,200 ppb (MW-1) <br /> Methyl tert-butyl ether (MtBE), analyzed using I=PA Method 8260B, was detected in seven of the eleven <br /> wells sampled at concentrations ranging from 0 68 ppb (MW-5) to 99 ppb (MW-7) 1,2-dichloroethane <br /> I\ARCM05951QMRs1200412Q1V1R04 doc <br />