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r - s <br /> Case Closure Summary Page 2 <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 (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 83 1.4 Ethylbenene .640 .013 <br /> TPH (Diesel) 22,000 230 Xylene 1.4 .150 <br /> Benzene .750 .024 Lead 8.1 NA <br /> Toluene .099 .099 MTBE .650 NA <br /> Comments: All levels in ppm- Soil Before TPH, BEX levels from soil below UST 1 N (17' depth)at time of removal of tank, <br /> Toluene & MTBE results from Fuel Dispenser 2 (3' depth) at time of dispenser removal, Lead from UST 1 S (16' depth) at <br /> time of tank removal. Soil After levels for TPH are from over-excavation of UST 1 N area (24' depth), BTEX levels from Fuel <br /> Dispenser 2 which was not over-excavated. Pipeline and UST samples at time of removal within 10-30 feet of Fuel <br /> Dispenser 2 area were non detect for MTBE and BTEX. Groundwater investigation not required. <br /> lV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin an. 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: Number Decommissioned: Number retained: <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising REHS <br /> Signatur — Date: 7 cl <br /> 1 <br /> V!, Central Valley Regional Water Duality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: Mark List Response: <br /> Title: Engineering 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 <br /> site file. <br />