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Date June 6, 2000 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 02186 Address 3212 North California Street, Stockton, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person IT Corporation/David Foley <br /> Consultant Project No 803883 <br /> Primary Agency/Regulatory ID No Carol Oz, San Joaquin Coun Public Health Services <br /> WORK PERFORMED THIS QUARTER (First 2000) <br /> 1 Groundwater samples were collected and submitted for laboratory analysis from monitoring wells MW-1 <br /> through MW-4 and vapor well VW-3 Analysis included oxygenates by USEPA Method 8260 <br /> 2 IT compiled and evaluated the groundwater monitoring data <br /> 3 Submitted workplan for further assessment of groundwater impacts and feasibility testing <br /> WORK PROPOSED FOR NEXT QUARTER (Second 2000) <br /> 1 Quarterly groundwater monitoring will continue on behalf of ARCO The next sampling event is <br /> tentatively scheduled for June 2000 Groundwater samples from wells MW-1 through MW-4 and vapor <br /> well VW-3 will be collected and analyzed for total petroleum hydrocarbons as gasoline (TPHG) using <br /> U S Environmental Protection Agency (USEPA) Method 8015 Modified, for benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX), and methyl tert-butyl ether (MTBE) using USEPA <br /> Method 8020, and for oxygenates tertiary butanol, MTBE, di-isopropyl ether, ethyl tertiary butyl ether, <br /> and tertiary amyl methyl ether using USEPA Method 8260 <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-4, and VW-3 = Quarterly <br /> Frequency of Groundwater Monitoring Quarterly _. <br /> Sample Date Aril 3, 2000 <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 34 30 to 35 90 <br /> Direction of Groundwater Flow Northeast <br /> Groundwater Gradient 0 003 <br /> i <br /> CP W 1CamPk\Data\Archive\Arco121861Qtrly12186Q100 DOC-984t I IT Corporation <br /> 06/06/00 <br />