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Treatment and Disposal of Affected Material <br /> Material Amount(Units) Action(Treatment or Disposal w/Destination) Date <br /> 4 tanks Schnitzer Steel Products, Co., 12000 Folsom Blvd., Rancho 10/16/1989 <br /> Tank(s) Cordova, CA 95742 <br /> 6 tanks West Coast Equipment, Inc., 5100 Taylor Court, Turlock, CA Circa 9/18/1997 <br /> 95381. West Coast manifest unsigned by facility operator) <br /> Piping Unknown quantity West Coast Equipment, Inc., 5100 Taylor Court, Turlock, CA Circa 9/18/1997 <br /> 95381. West Coast manifest unsigned by facility operator) <br /> Free Product 55 gallons waste oil Refinery Services, Inc., 13831 N. Hwy 99, Patterson, CA 95363 10/10/1989 <br /> Soil 241 tons(-180 cubic Forward Landfill; 9999 Austin Rd., Manteca, CA 95336. 3/16/1998 <br /> yards) <br /> 60 gal rinsate Refinery Services, Inc., 13831 N. Hwy 99, Patterson, CA 95363 10/10/1989 <br /> Water/oil 1060 gallons rinsate Americlean, Inc., 4570 Almond Dr., Silver Springs, NV 89429 9/17/1997 <br /> and sludge Americlean manifest was not signed or dated by recv'g facility) <br /> III. Release and Site Characterization Information continued <br /> Maximum Documented Contaminant Concentrations (ppm) --Before and After Cleanup (limited to over-excavation <br /> associated with the two UST removal events in 1989 and 1997). <br /> Contaminant Soil Before Soil After Water Water Contaminant Soil Before Soil After Water Water <br /> Before After Before After <br /> TPH (Gas) 9,600 NA 3.4 <0.05 Xylenes 680 NA 0.23 <0.006 <br /> TPH(Diesel) 32,000 NA 350 <0.05 MTBE 17 NA 8.8 <0.01 <br /> Benzene 44 NA 0.84 <0.005 TBA 6.1 NA 0.0096 <0.01 <br /> Toluene 480 NA 0.23 <0.005 Lead 9.2 NA NA NA <br /> Eth (benzene 180 NA 0.048 <0.005 1,2-DCA NA NA 1.1 0.19 <br /> Comments: Soil Before—TPHg, benzene, toluene, ethylbenzene and xylenes from MW5-20' (6/1/1997), MTBE from <br /> sample T6-17' (9/1/1997; TBA from sample T6-17' (9/22/1997); TPHd from SP1-5A&B (1/29/1999); lead from sample Tank <br /> #10-1000-East(10/06/1989). Soil After data was not collected, therefore None Analyzed. <br /> Water`Before'—TPHd from MW-1 (9/18/1992), TPHg from MW-1 (12/7/1992), benzene from MW-5 (3/11/1998), toluene <br /> from MW-6 (6/17/1999), ethylbenzene and xylenes from MW-1 (6/10/2002), MTBE from B-17-65' (6/10/1999), TBA from <br /> MW-5 (6/10/1998), and 1,2-DCA from MW-5 (6/17/1999). <br /> Water'After'—highest concentrations of each COC detected in sample from MW-5 during the last monitoring event on <br /> 4/9/2012 <br /> W. 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 /> Monitoring/Vapor wells decommissioned: No Number Decommissioned: 1 Number retained: 12 <br /> List enforcement actions taken: NOR issued 2/01/1990, 1/14/1991, 12/29/1992 <br /> List enforcement actions rescinded: None <br /> Page 2 <br />