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Case Closure Summary Page 2 k <br /> Leaking Underground Fuel Storage Tank��gram <br /> I <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) 240 35 22 ND Xylene 6.8 1.2 .328 ND <br /> TPH(Diesel) 1400 590 280 ND Ethylbenzene 36 1.2 1.3 ND <br /> Benzene 1.6 <.05 1.9 ND oil &Grease u <br /> Toluene .630 .29 .052 ND Heavy Metals <br /> Mineral Sprits NS NS MTBE <br /> MTBE NS .00028 NS ND <br /> Comments: SOIL BEFORE FOR TPH DIESEL FROM B3 (12.5'), TPH GAS AND BTEX FROM BI (12.5'). SOIL AFTER <br /> FOR TPH DIESEL FROM B12 (17.5'), TPH GAS, BENZENE, TOLUENE, ETHYL BENZENE FROM B11 (12.5'), XYLENE <br /> FROM B12 (10'). GROUNDWATER BEFORE- FOR TPH DIESEL FROM B1,TPN GAS FROM MW1 (01123195), 13ETEX <br /> FROM MW3 (01123195). GROUNDWATER AFTER FROM'MW3 (04108198) <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Pian? 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: YES Number Decommissioned: 7 Number retained: 0 <br /> List enforcement actions taken: NOR SENT <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONNA HERAN Title: DIRECTOR OF ENVIRONMNETAL HEALTH <br /> Signature: Date: <br /> Vl, Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 813198 Response Date: 8128198 <br /> RB Staff. MARK LIST Response: CONCURRENCE <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 /> s <br />