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L I%d <br /> LDate June 28, 2010 <br /> PALISADES GAS AND WASH STATION NO. 835 <br /> SEMI-ANNUAL GROUNDWATER MONITORING REPORT <br /> LFacility No: 835 Address: 2705 Country Club Boulevard, Stockton, California <br /> Palisades Gas Project Supervisor: Charles Miller <br /> Consulting Co./Contact Person: Stratus Environmental Inc./Scott Bittinger, P.G. <br /> Consultant Project No: 2007-0835-01 <br /> Primary Agency/Regulatory ID No: Michael J. Infuma, Jr., San Joaquin County Environmental Health <br /> Department/Site No. 1072, RO No. 1504 <br /> WORK PERFORMED THIS PERIOD (First and Second Quarter 2010): <br /> 1. Stratus monitored groundwater elevations in wells MW-1 through MW-21, VEW-1, and VEW-3 on <br /> June 10, 2010. Samples were collected from all wells except VEW-3, which had insufficient <br /> groundwater to enable sample collection. <br /> 2. Groundwater samples were analyzed at a state-certified analytical laboratory for diesel range <br /> organics (DRO) and as gasoline range organics (GRO) by EPA Method SW8015B/DHS LUFT <br /> L Manual, and for benzene, toluene, ethylbenzene, and total xylenes (BTEX), methyl tertiary butyl <br /> ether (MTBE), tertiary amyl methyl ether (TAME), ethyl tertiary butyl ether (ETBE), di-isopropyl <br /> ether (DIPE), tertiary butyl alcohol (TBA), and 1,2-dichloroethane (1,2-DCA) by EPA Method <br /> SW82606. <br /> 3.. Stratus compiled and evaluated groundwater monitoring data. <br /> LWORK PROPOSED FOR NEXT SEMI-ANNUAL PERIOD(Third and Fourth Quarter 2010): <br /> 1. The next sampling event is tentatively scheduled for December 2010. Groundwater samples will be <br /> collected for laboratory analysis from wells MW-1 through MW-21, VEW-1, and VEW-3. <br /> Groundwater samples will be analyzed at a state-certified analytical laboratory for DRO and GRID <br /> by EPA Method SW8015B/DHS LUFT Manual, and for BTEX, MTBE, TAME, ETBE, DIPE, TBA, <br /> and 1,2-DCA by EPA Method SW8260B. <br /> L <br /> Current Phase of Project: Monitoring <br /> LFrequency of Groundwater Sampling: All Wells=Semi-Annually <br /> Frequency of Groundwater Monitoring: Semi-Annually <br /> Groundwater Sampling Date: June 10,2010 <br /> Is Free Product(FP)Present on Site: No <br /> Approx. Depth to Groundwater(Upper): 6.08 to 8.95 feet below top of well casing <br /> Approx. Depth to Groundwater(Lower): 7.12 to 8.42 feet below top of well casing <br /> Groundwater Flow Direction(Upper): Predominately Southeast <br /> Groundwater Gradient(Upper): 0.001 to 0.002 Wit <br /> Groundwater Flow Direction(Lower): Northeast <br /> Groundwater Gradient(Lower): 0.002 fVIt <br /> LKA1JSAGasoliTe 83SQuarterly\:Z010\USA_835 2QIO.DOC STRATUS <br /> L <br />