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Case Closure Summary Page. <br /> swgaking Underground Fuel Storage Tank Pam <br /> III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations =- Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After. Before After .. Before After Before After <br /> TPH (Gas) 2.1 2.1 8.4 6.0 Xylenes <0.0.05 , <0.005 0.150 0.0228 <br /> TPH (Diesel) 10 10 2.0 2.0 Ethylbenzene <0.005 <0.005 0.012 0.0098 <br /> Benzene <0.005 <0.005 <0.0005 <0.0005 Oil S Grease NA NA NA NA <br /> Toluene <0.005 <0:005 <0.0005 <0.0005 Heavy Metals NA . NA Pb=0.0071 0.0071 <br /> MTBE <0.005 <0.005 0.310 <0.001 <br /> Comments: The soil before and the soil after concentrations aee from soil borings B1-5,in the former UST area and 136-5 <br /> west of MW4. MW4 is located approximately 40 feet dawn-gradient of the former USTs. 'In August 2009, 15,000 gallons of <br /> water were extracted/pumped from MW4. The ground water before concentrations are from MW4 sampled on 07/31/2008 <br /> before ground water extraction. The ground water after concentrations are.from MW4 sampled on 04/02/2010 after ground <br /> water extraction.. The lead results are from a ground water san m. le collected at.the-time of UST removal in the excavation.. <br /> 1V. 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 /> r <br /> Does corrective action protect public health for current land use?Yes <br /> Site management requirements: NA <br /> .Should corrective action be reviewed if land'use changes?Yes <br /> Monitoring/Vapor wells Decommissioned: No: Number Decommissioned: 0 Number retained: 7 <br /> List enforcement actions taken: NOR sent to RP <br /> List enforcement actions rescinded: NA <br /> V. Local Agency Representative Data <br /> Name:Adrienne Ellsaesser, REHS Title: Acting.Program Coordinator <br /> Signature: �� � � Date: fZ/G�a <br /> i <br /> Vl. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: Response Date: , <br /> RB Staff: J. Barton JResponse;: <br /> Title: Eng. Geologist <br /> VII. Additional Comments, Data, etc. <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br />