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+, Date A nl 30, 2002 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2186 Address 3212 North California Street, Stockton, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person Delta Environmental Consultants, Inc 1 Jay R Johnson <br /> Consultant Project No D000-330-1 <br /> Primary Agency/Regulatory ID No Samuel Savi , San Joaquin Count PHSIEHD <br /> WORK PERFORMED THIS QUARTER (First 2002) <br /> 1 Delta collected monthly depth to water measurements in the monitoring wells and vapor extraction <br /> wells <br /> 2 Groundwater samples were collected from monitoring wells MW-1 through MW-7 and vapor <br /> extraction wells VW-113, VW-213, and VW-3B on March 14, 2002, and submitted for laboratory <br /> analysis <br /> 3 Delta compiled and evaluated the groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER (Second 2002) <br /> 1 Depth-to-water measurements will be collected from each well on a monthly basis <br /> 2 Quarterly groundwater sampling will continue at the site The next sampling event is tentatively <br /> scheduled for June 2002 Groundwater samples will be collected from monitoring wells MW-1 <br /> through MW-7, and vapor extraction wells VW-1 B, VW-213, and VW-38, and analyzed for total <br /> petroleum hydrocarbons as gasoline (TPHG), benzene, toluene, ethylbenzene, and total xylenes <br /> (BTEX) using USEPA Method 8015/8020 DHS LUFT, and for tertiary butyl alcohol (TBA), methyl <br /> tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl <br /> methyl ether(TAME), and 1,2-dichloroethane (1,2-DCA) using USEPA Method 8260B <br /> Current Phase of Protect Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-7 and deep vapor extraction wells <br /> VW-1B VW28, and VW-38= Quarterly <br /> Frequency of Groundwater Monitoring Monthly <br /> Sample Date March 14,2002 <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 38 70 to 40 90 feet bgs (March 14, 2002) <br /> Direction of Groundwater Flow East-Northeast <br /> Groundwater Gradient 0 0019 to 0 0021 ft/ft <br /> P 1ARCO\21861QTR1.Y120021Arco-2186_1Q02 doc Delta <br />