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Y T <br /> Date October 12, 1998 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 00548 Address 1612 Hammer Lane, Stockton, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person Pinnacle/Mark Capps <br /> Consultant Project No 20805-140 008 <br /> Primary Agency/Regulatory ID No Lori Duncan, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Second 1998) <br /> 1 Groundwater samples were collected from monitoring wells MW-1 through MW-6 for laboratory <br /> analysis <br /> 2 Pinnacle compiled and evaluated groundwater monitoring data <br /> 3 A letter concerning oxygenate sampling of wells at this site was sent to the San Joaquin County Public <br /> Health Services (SJCPHS) along with the Tank Removal Report on May 4, 1998 The SJCPHS letter <br /> dated June 18, 1998, allowed analysis of samples from current monitoring wells using U S <br /> Environmental Protection Agency (USEPA) Method 8020 After installation of any new on-site or off- <br /> site wells, SJCPHS will require oxygenate analysis using USEPA Method 8260 <br /> WORK PROPOSED FOR NEXT QUARTER (Third 1998) <br /> 1 Pinnacle will continue to perform quarterly groundwater monitoring for ARCO The next sampling <br /> event is tentatively scheduled for September 1998 Monitoring wells MW-1 through MW-6 will be <br /> sampled and analyzed for total petroleum hydrocarbons as gasoline using USEPA Method 8015 <br /> modified, and for benzene, toluene, ethylbenzene, and total xylenes and methyl tert-butyl ether <br /> (MTBE) using USEPA Method 8020 Monitoring well screens are submerged below the water table <br /> As part of the third quarter monitoring event, no purge sampling of vapor extraction wells will be <br /> conducted to assess water table impacts <br /> 2 Pinnacle will submit a workplan for additional assessment at the site and installation of on-site soil <br /> vapor extraction and air sparge wells <br /> Current Phase of Protect Monitoring/Assessment <br /> Frequency of Groundwater Sampling Wells MW-1 through MW-6 =Quarterly <br /> Frequency of Groundwater Monitoring Quarter) <br /> Sampling Date June 23, 1998 <br /> Is Free Product (FP) Present on Site No <br /> SACK 1LSG12NDQTR-110548Q298 DOC 981mti I <br />