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yl <br /> r <br /> Date September 19, 2000 <br /> ARCO QUARTERLY GROUNDWA�TENITORING REPORT <br /> �l <br /> Facility No 02186 Address 3212 North California Street, Stockton, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person Delta Environmental Consultants, Inc /Jay R Johnson <br /> Consultant Project No D000-330-1 <br /> Primary Agency/Regulatory ID No Carol Oz, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Second 2000) <br /> 1 Groundwater samples were collected and submitted for laboratory analysis from monitoring wells <br /> MW-1 through MW-4 and vapor well VW-3 Analysis included oxygenates by USEPA Method 8260 <br /> 2 Delta compiled and evaluated the groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER (Third 2000) <br /> 1 Delta will continue to perform quarterly groundwater monitoring The next sampling event is tentatively <br /> scheduled for September 2000 Groundwater samples from wells MW-1 through MW-4 and vapor <br /> wells VW-1 through VW-3 will be collected and analyzed for total petroleum hydrocarbons as gasoline <br /> (TPHG) using U S Environmental Protection Agency (USEPA) Method 8015 Modified, for benzene, <br /> toluene, ethylbenzene, and total xylenes (BTEX), and methyl tert-butyl ether(MTBE) using USEPA <br /> Method 8020, and for oxygenates Including tert-butyl-alcohol, MTBE, dl-isopropyl ether, ethyl tertiary <br /> butyl ether, and tertiary amyl methyl ether using USEPA Method 8260 <br /> 2 Delta will submit a workplan for additional site assessment and feasibility testing <br /> 3 The soil vapor extraction test is scheduled to be conducted in September <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 June 22, 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 37 to 36 08 <br /> Direction of Groundwater Flow East <br /> Groundwater Gradient 0 0027 ft/ft <br /> C IARC012l861QTRLY1200012186Q200 doc Delta <br /> 09 I WI) <br />