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T <br /> Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> III. Release and Site Characterization Information continued <br /> Maximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> Contaminant Soil Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) <br /> After Before After After Before After <br /> TPH-g (Gas) 12,000 3100 34 N/A Xylene 35,000 150 7.1 N/A <br /> TPH-d (Diesel) 1,300 520 440 N/A Ethylbenzene 12,000 77 2.5 N/A <br /> Benzene <12 <0.025 0.046 N/A Motor Oil 190 N/A N/A N/A <br /> Toluene 0.051 <0.025 0.26 N/A Heavy Metals N/A N/A N/A N/A <br /> Lead 1810 1 N/A N/A N/A MTBE 0.024 <0.025 0.0001 N/A <br /> Comments: The Soil Before concentration for TPH-g sample was from B-3 @ 20 feet on 06/27/2003, TPH-d from <br /> CPT-PI-A4 @ 4 feet on 06/25/2004, Benzene from CPT-EXC-BT12 @ 12 feet on 07/1/2004, Toluene from CPT-EXC-BT @ <br /> 25 feet on 06/16/2004, Lead and Motor Oil from CPT-EX-5 COMP @ 5 feet on 06/10/2004, Xylene from CPT-PI-A10 @ 10 <br /> feet on 06/25/2004, Ethylbenzene from CPT-PI-A10 @ 10 feet on 06/25/2004, MTBE from B-4 @ 10 feet on 6/27/2003. <br /> The Soil After concentrations TPH-g, TPH-d, Ethylbenzene and xylenes from CSB-2 @ 30.5 feet on 01/16/2004, Benzene, <br /> Toluene and MTBE from CPT-EXC-25 @ 25 feet on 04/19/2005. The Groundwater Before concentrations for TPH-g, <br /> TPH-d, Toluene, Xylene and Ethylbenzene are from CSB-2 on 01/16/2004, Benzene from CPT-EXC-W on 06/16/2004, and <br /> MTBE from CPT-EXC-GW on 04/20/2005. Groundwater After concentrations was not collected. <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 uses changes?Yes <br /> Monitoring/Vapor wells decommission: N/A Number Decommissioned: N/A Number retained: N/A <br /> List enforcement actions taken: NOR on 03/07/2008, 02/01/2012, 09/12/2003, 03/07/2008 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Sig ature: 14„ a_C `_ f Z Date: 8/15/2014 <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: 5/6/2014 Response Date: 6/26/2014 <br /> RB Staff: Cori Condon Response: Concurrence <br /> Title: Senior Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> No waste oil tanks are known to have been located on site. <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br /> Page 2 <br />