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c <br /> Date March 1, 2001 <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 Delta Environmental Consultants, Inc /Ja R Johnson <br /> Consultant Project No D000-330-1 <br /> Primary Agency/Regulatory ID No Carol Oz, San Joaquin Count PHS/EHD <br /> WORK PERFORMED THIS QUARTER (Fourth 2000) <br /> 1 Delta collected depth to water measurements <br /> 2 Groundwater samples were collected and submitted for laboratory analysis from monitoring wells <br /> MW-1 through MW-4 and vapor extraction well VW-3A <br /> 3 Delta compiled and evaluated the groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER(First 2001) <br /> 1 Depth-to-water measurements will be collected from the monitoring wells and shallow vapor <br /> extraction wells on a monthly basis <br /> 2 Delta will continue to perform quarterly groundwater monitoring The next sampling event is <br /> tentatively scheduled for March 2001 Groundwater samples from monitoring wells MW-1 through <br /> MW-4 and vapor extraction wells VW-1A through VW-3B (shallow vapor wells) will be collected ' <br /> and analyzed for total petroleum hydrocarbons as gasoline (TPHG) using U S Environmental <br /> Protection Agency (USEPA) Method 8015 Modified, for benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX), using USEPA Method 8020, and for oxygenates tertiary butyl alcohol (TBA), <br /> methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), <br /> tertiary amyl methyl ether (TAME) using USEPA Method 8260 <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-4 and shallow vapor wells <br /> VW-1A through VW-313= Quarterly <br /> Frequency of Groundwater Monitoring Twice per quarter <br /> Sample Date December 20, 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 36 00 to 41 20 feet bgs(10119100)and <br /> 36 05 to 39 23 feet bgs(12/20/00) <br /> Direction of Groundwater Flow East-Northeast <br /> I1 <br /> Groundwater Gradient 0 0027 fUft <br /> C 1ARC0121861QTR_M200012186Q400 Delta <br /> 3/]101 <br />