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IM <br /> Date April 14, 2006 <br /> PALISADES GAS AND WASH STATION NO 835 <br /> QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 835 Address 2705 Country Club Boulevard, Stockton, California <br /> Palisades Gas Project Supervisor Charles Miller <br /> Consulting Co/Contact Person Stratus Environmental, Inc 1 Gown S Kowtha, P E <br /> Consultant Project No 2007-0835-01 <br /> Primary Agency/Regulatory ID No Michael J Infurna, Jr , San Joaquin County Environmental Health <br /> Department I Site No 1072, RO No 1504 <br /> WORK PERFORMED THIS QUARTER(First 2006) <br /> 1 Stratus monitored groundwater elevations and collected groundwater samples from wells MW-1 <br /> through MW-10, VEW-1, and VEW-3 on March 23, 2006 <br /> 2 Stratus compiled and evaluated groundwater monitoring data <br /> 3 Stratus prepared and submitted a Well Installation Work Plan (dated April 7, 2006) <br /> WORK PROPOSED FOR NEXT QUARTER (Second 2006) <br /> 1 The next sampling event is tentatively scheduled for June 2006 <br /> 2 Groundwater samples will be collected for laboratory analysis from wells MW-1 through MW-10, <br /> VEWA and VEW-3 Groundwater samples will be analyzed at a state-certified analytical laboratory <br /> for total petroleum hydrocarbons as diesel (TPHD) and as gasoline (TPHG) by EPA Method <br /> SW8015B/DHS LUFT Manual, and for benzene, toluene, ethylbenzene, total xylenes (BTEX), methyl <br /> tertiary butyl ether (MTBE), tertiary amyl methyl ether (TAME), ethyl tertiary butyl ether (ETBE), <br /> di-isopropyl ether (DIPE), tertiary butyl alcohol (TBA), 1,2-dichloroethane (1,2-DCA), methanol, and <br /> ethanol by EPA Method SW8260B <br /> 3 Upon approval of the work plan, Stratus will initiate the well installation activities <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling All Wells=Quarterly _ <br /> Frequency of Groundwater Monitoring Quarterly <br /> Groundwater Sampling Date March 23, 2006 <br /> Is Free Product(FP) Present on Site NA <br /> Approximate Depth to Groundwater 4 05 to 6 76 feet below top of well casing <br /> Groundwater Flow Direction East-southeast <br /> Groundwater Gradient 0 0030 ft/ft <br /> K\USA Gasoline\0835\Quarterly\2006\USA_835_IQ06 DOC STRATUS <br />