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F1 q <br /> • <br /> Date June 10, 1999 <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 20805-140 011 <br /> Primary Agency/Regulatory ID No Lori Duncan, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (First 1999). <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 /> 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 (Second 1999) <br /> 1 Pinnacle will continue to perform quarterly groundwater monitoring for ARCO The next sampling <br /> event is tentatively scheduled for June 1999 Monitoring wells MW-1 through MW-6 will be sampled <br /> and analyzed for total petroleum hydrocarbons as gasoline using USEPA Method 8015 modified, and <br /> for benzene, toluene, ethylbenzene, and total xylenes, and methyl tert-butyl ether (MTBE) using <br /> USEPA Method 8020 <br /> 2 Pinnacle will select contractor for remediation system installation <br /> • <br /> CRE IARC0105481QTRLY10548Q199 DOC-9"sg 1 '� pQ <br />