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Date August 27, 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 /Jay R Johnson <br /> Consultant Project No D000-330-1 <br /> Primary Agency/Regulatory ID No Margaret Lagono, San Joaquin County PHS/EHD _ <br /> WORK PERFORMED THIS QUARTER (Second 2001) <br /> 1 Delta collected depth to water measurements in the monitoring wells and vapor extraction wells on <br /> a monthly basis <br /> 2 Groundwater samples were collected on June 21, 2001 and submitted for laboratory analysis from <br /> monitoring wells MW-1 through MW-4 and vapor extraction wells VW-1 B, VW-2B, and VW-313 <br /> 3 Delta compiled and evaluated the groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER(Third 2001) <br /> 1 Depth-to-water measurements will be collected from the monitoring and vapor extraction wells on <br /> a monthly basis <br /> 2 Delta will continue to perform quarterly groundwater monitoring The next sampling event is <br /> tentatively scheduled for September 2001 Groundwater samples from monitoring wells MW-1 <br /> through MW-4 and vapor extraction wells VW-1B, VW-213 and VW-313 will be collected and <br /> analyzed for total petroleum hydrocarbons as gasoline (TPHG) using US Environmental <br /> Protection Agency (USEPA) Method 8015 DHS LUFT, and for benzene, toluene, ethylbenzene, <br /> and total xylenes (BTEX), tertiary butyl alcohol (TBA), methyl tertiary butyl ether (MTBE), di- <br /> isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), and tertiary amyl methyl ether (TAME) <br /> using USEPA Method 8260 <br /> 3 Delta has retained Woodward Drilling Company to complete well installation activities outlined in <br /> the July 14, 2000 work plan beginning August 13, 2001 <br /> Current Phase of Protect Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-4 and shallow vapor wells VW-1 <br /> through VW-3= Quarter/ <br /> Frequency of Groundwater Monitoring Quarterly_ <br /> Sample Date June 21,2001 <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 _39 37 to 40_94 feet bgs <br /> Direction of Groundwater Flow Northeast - <br /> Groundwater Gradient 0 0039 ft/ft <br /> C 1ARC0121861QTRLY120011Arco 2186 2Q01 Report doc Delta <br /> 8/27/01 <br />