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Page 2 <br /> Case Closure Summary continued <br /> 242 N. Sutter Street, Stockton, CA <br /> Treatment and Disposal of Affected Material <br /> Material Amount(Units) Action(Treatment or Disposal w/Destination) Date <br /> Tanks 4 @ 550 gallons Tanks closed in place prior to tank laws 2/19/1960 <br /> 1 @ 2,000 gallons No official tank removal records filed 10/1988 <br /> 2@ 4,000 gallons No official tank removal records filed 10/1988 <br /> 2@ 3,000 gallons No official tank removal records filed 10/1988 <br /> 1 @ 550 gallons (waste No official tank removal records filed 10/1988 <br /> oil) <br /> Piping <br /> Soil 24 Drums Republic Service Vasco Road Landfill, 3/5/2001 <br /> 4001 N. Vasco Rd., Livermore, CA 94550 <br /> Soil 4,950 pounds L & D Landfill, 8635 Fruitridge Road, Sac, CA 95827 11/18/2005 <br /> Manifest not signed by receiving facility) <br /> Groundwater 4 Drums Chemical Waste Management 3/4/2009 <br /> 35251 Old Skyline Road, Kettleman, CA 93239 <br /> Barrels <br /> 111. Release and Site Characterization Information continued <br /> FF_ <br /> 7um7Documented Contaminant Concentrations -- Before and After Cleanup <br /> ntaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> PH (Gas) 5,100 NA 470 7.5 Xylenes 340 NA 20.0 0.18 <br /> TPH (Diesel) 2,400 NA 230 4.8 Ethylbenzene 48 NA 3.6 0.31 <br /> TPHmo NA NA NA NA Lead (Pb) 26 NA <0.05 NA <br /> Benzene 11 NA 1.9 0.011 MTBE <0.02 NA 0.0093 NA <br /> Toluene 130 NA 9.0 0.001 <br /> 1,2 DCA NA NA 0.0076 NA <br /> Comments: Soil Before: TPHg taken from SB-3-S-20-080616 @ 20 feet bsg on 6/16/2008. TPHd and MTBE taken from <br /> Probe A @ 30 feet bsg from northeast corner of the site(believed to be the location of former USTs) on 5/22/2000. Benzene <br /> and toluene taken from SB-3-S-51-080617 @ 51feet bsg on 6/17/2008. Ethylbenzene and xylene taken from SB-3-S-24- <br /> 080616 @ 24 feet on 6/16/2008. Lead taken from Probe B @ 10 feet on 5/22/2000 from northeast corner of the site. Soil <br /> After: No soil after data. No active remediation conducted. Water Before: TPHg, TPHd, benzene, ethylbenzene, xylene <br /> and lead from Probe A at northeast corner of tank site on 5/22/00. Toluene from Probe J at northeast corner on 1/31/02. <br /> 1,2 —DCA taken from MW-1 on 7/23/2004 and MTBE taken from MW-2 on 9/10/01. Water After: TPHg, TPHd, benzene, <br /> toluene, ethylbenzene and xylene taken from MW-1 on 6/25/2013. TPHmo,1,2 - DCA, lead and MTBE not analyzed. <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 /> Monitoring/Vapor wells decommissioned: No Number Decommissioned: 0 Number retained: 8 <br /> List enforcement actions taken: NOTICE OF RESPONSIBILITY: 2/26/97, 3/24/06 <br /> List enforcement actions rescinded: NONE <br />