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easeulosure Summary Page2 _ <br /> �.✓eaking Underground Fuel Storage Tank ram <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 Before (ppm) Water (ppm) <br /> Before After Before After After Before After <br /> TPH (Gas) 11,000 8.7 <.05 <.05 Xylene 820 0.54 <.0005 <.0005 <br /> TPH (Diesel) <1 <1 <.05 <.05 Ethylbenzene 120 0.12 <.0005 <.0005 <br /> Benzene 71 0.019 <.0005 <.0005 Oil &Grease N/A N/A N/A N/A <br /> Toluene 390 0.022 <.0005 <.0005 Lead 4.2 4.2 N/A N/A <br /> MTBE UNKNOWN <.05 UNKNOWN <.005 <br /> Comments: TANK FIELD OVEREXCAVATED WITH 11,000 PPM TPH REMAINING AT 12 FEET. FOUR(4) <br /> ADDITIONAL SOIL BORING LOCATIONS DEFINE THE LIMITED EXTENT; 19.38 GALLONS OF GASOLINE 18 FEET <br /> BGS REMAINS IN SOIL. ON SITE MONITORING WELL ND. <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: <br /> Should corrective action be reviewed if land use changes? (YES) <br /> Monitoring/Vapor wells decommissioned: (YES) Number Decommissioned: 1 Number retained: 0 <br /> List enforcement actions taken:. "NOR" SENT, LEVEL 1 <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> N e: DONNA HE TITLE: DIRECTOR OF ENVIRONMENTAL HEALTH <br /> 7 ,- /) ///7 1 1 <br /> Siionature: % !� Date: <br /> VI. e tral Valley Regional Water Quality Control Board (RB) Notification <br /> ate Submitted to RB: 02/11/98 Response Date: 09/10/98 <br /> RB Staff: MARK LIST Response: VERBAL CONCURRENCE <br /> Title: ENGINEERING GEOLOGIST NOT WRITTEN CONCURRENCE <br /> VII. Additional Comments, Data, etc. <br /> FdW—RISK SOIL ONLY SITE <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 />