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' .► • � .:: Case Closure Summary e 2 <br /> Leaking Underground Fuel Storage TZ�Irogram <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) 23,000 950.0 sheen <0.050 Xylene 1,500 80.0 27,000 <0.005 <br /> TPH (Diesel) NIA Ethylbenzene 610 1.3 unknown <0.005 <br /> Benzene 150 <0.50 7,900 <0.005 Oil &Grease NIA <br /> Toluene 2,100 <0.50 21,000 <0.005 Heavy Metals NIA <br /> MTBE unknown unknown unknown .0063 <br /> u <br /> Comments: Residual soil contamination (gasoline) exists in NE quadrent of former tank field as evidenced in confirmation <br /> boring CB4NEW-1 completed 09107194. The last round of groundwater sample results were below detection limits for gas <br /> and BTEX. MW#35 has 6.3 ppb MTBE. <br /> - I <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? (YES) <br /> i <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) I' <br /> Monitoring/Vapor wells decommissioned: (NO) Number Decommissioned: 23 Number retained: 13 <br /> List enforcement actions taken: NOR sent to Responsible Party; T" level enforcement. <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising REHS/Site Mitigation/LOP Unit IV <br /> Signature: c Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: J. Brathovde Response: <br /> Title: Assoc 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 <br /> site file. <br /> l <br />