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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> Treatment and Disposal of Affected Material <br /> Material Amount(Units) Action(Treatment or Disposal w/Destination) Date <br /> Tank(s) 6 USTs LMC,600 S 4 Street, Richmond, CA 94804 4/22/1994 <br /> Piping <br /> Free Product Approx. 1215 gals. River Bank Oil Transfer 3rd Qt., 2002 <br /> 5300 Claus Rd. <br /> Riverbank, CA 95367 <br /> Soil <br /> Groundwater 2000 gals. Envirotech 8/6/1999 <br /> 2480 Athen <br /> Roseville, CA 95843 <br /> MW Purged Water Instrat Inc. <br /> 1105-C Airport Rd. <br /> Rio Vista, CA Various dates <br /> Barrels 460 gals. Refinery Service 4/4/1994 <br /> 133331 N H 33, Patterson, CA 95363 <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> Contaminant Soi! (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 720 NA 270 270 Xylene 1.6 NA 0.054 <.0005 <br /> TPH (Diesel) 19000 NA 1500 190 Ethylbenzen X0.59 NA 0.013 <.0005 <br /> TPH (Oil) 510 NA NA NA Oil & Grease NA NA NA NA <br /> Benzene <0.05 NA 0.034 <.0005 Heavy Metal 14 NA NA NA <br /> Toluene 0.12 NA 0.011 <.0005 (PB) NA <br /> MTBE <0.02 .012 <0.001 <br /> Comments: SOIL BEFORE CONCENTRATIONS: TPH-g, TPH-d,B,T,E,X, and MTBE are from MW-4 sample at 15 ft. <br /> collected on 6/611996; TPH-o is from sample SP6 (stockpile) collected on 41111994,and Lead (Pb) is from SP-3 (stockpile) <br /> collected on 41111994. SOIL AFTER CONCENTATIONS: No samples collected or analyzed. WATER BEFORE <br /> CONCENTRATIONS: TPI-g is from MW-4 collected on 811712005, TPH-d is from MW-4 collected on 5/13/2005, B is from <br /> P4 collected on 1211211995; T is from MWA collected on 612511999; E and X are from MW4 collected on 612411996;MTBE <br /> is from MW-3 collected on 612411996. WATER AFTER CONCENTRATION: TPH-d is from MW-4 collected on <br /> 1/2612012;TPH-g,B,T,E,X are from MW-4 collected on 7/29/2011; and MTBE is from MW-4 collected on 712212008. <br /> NA-Not Analyzed <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan?Yes <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan?Yes <br /> Does corrective action protect public health for current land use?Yes <br /> Site management requirements: None <br /> Should corrective action be reviewed if land use changes?Yes <br /> MonitoringNapor wells decommissioned: Yes Number Decommissioned:1 Number retained:16 <br /> List enforcement actions taken: NOR sent to RP on 7/11/1994 <br /> List enforcement actions rescinded: None <br />