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R beaking Underground Fuel Storage Tank ram <br /> ' III Release and Site Characterization Information (continued) <br /> Maximum Doocumented Contaminant Concentrations --Before and After Cleanup <br /> Contaminant Sail (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 780 8A 6.9 2.0 Xylene NA 0.029 0.680 <0.0005 <br /> TPH (Diesel) NA NA NA NA Ethylbenzene 1400 0.06 0.230 <0.0005 <br /> Benzene 35 <0.005 0.420 <0.0005 Oil &Grease NA NA NA NA <br /> Toluene 2000 0.051 0.270 <0.0005 Heavy Metals Pb-6 NA NA NA <br /> MTBE NA 0.33 0.022 <0.001 <br /> Comments:The Soil Before concentrations are from a soil sample collected beneath the UST at the time of removal. The <br /> Soil After concentrations are from a confirmation soil boring P-1 at 20 feet bsg in the former UST location. The Water <br /> Before and Water After concentrations are from NW-1 located down-gradient from the former UST and approximately 5 feet <br /> outside the excavation. <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 /> Mon itoringiVapor wells decommissioned: Yes Number Decommissioned:4 Number retained:0 <br /> List enforcement actions taken: Site placed in LOP and NOR provided to RPs <br /> List enforcement actions rescinded: NA <br /> V. Local Agenc Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: r `; - Date: 7-2_c— Iii <br /> VI.Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: 05/20/2010 Response Date: 6103/2010 <br /> RB Staff: J. Barton Response: NFAR Concurrence <br /> Title: Eng. Geologist <br /> VII,Additional Comments, Data, etc. <br /> F_ <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official <br /> site file. <br />