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y l <br /> J �1 <br /> Date August 9, 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 URS Group, Inc 1 Vern Elarth <br /> Consultant Project No U2186-03-4 <br /> Primary Agency/Regulatory ID No Samuel Savi , San Joaquin Count PHSIEHD <br /> WORK PERFORMED THIS QUARTER (Second 2002) <br /> 1 Stratus collected depth to water measurements in the monitoring wells and vapor extraction wells <br /> in April and June Depth to water measurements were not collected in May <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-313 on June 19, 2002, and submitted for laboratory <br /> analysis <br /> 3 Groundwater monitoring data was compiled and evaluated <br /> WORK PROPOSED FOR NEXT QUARTER(Third 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 September 2002 Groundwater samples will be collected from monitoring wells <br /> MW-1 through MW-7, and vapor extraction wells VW-1B, VW-21B, and VW-313, and analyzed for <br /> total petroleum hydrocarbons as gasoline (TPHG), benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX) using USEPA Method 8015/8020 DHS LOFT, and for tertiary butyl alcohol (TBA), <br /> methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETRE), <br /> tertiary amyl methyl ether (TAME), and 1,2-dichloroethane (1,2-DCA) using USEPA Method <br /> 82608 <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-7 and deep vapor extraction wells <br /> VW-1 B,VW-213, and VW-3B=Quarterly <br /> Frequency of Groundwater Monitoring Monthly <br /> Sample Date June 19, 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 41 46 to 43 11 feet bgs (June 19, 2002) <br /> Direction of Groundwater Flow East-Northeast <br /> Groundwater Gradient 0 0023 to 0 0024 ft/ft <br /> �i <br /> P ISP-Arco for URS121861QUarterly120021Arco 2186_2Q02 doc <br />