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f Case Closure Summary Page 3 <br /> Leaking Underground Fuel Storage Tankk,;gram <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-(Ga s) 25,000 7,200 .220 <.050 Xylene 2,900 1,300 .015 <.0005 <br /> TPH (Diesel) 1.3 1.3 .320 .280 Ethytbenzene 530 200 .0029 <.0005 <br /> Benzene 270 170 .076 <.0005 Oil &Grease 210 210 ND NO <br /> Toluene 2,200 1,100 .027 <.0005 Heavy Metals <br /> DCA .055 .055 .0018 .0018 MTBE 170 <.050 <.0025 <.0025 <br /> Comments: TWO FORMER UST AREAS OVEREXCAVATED, FIRST SET IN 1989 AND SECOND SET IN 1998. SEPTIC <br /> AND DISPOSAL FIELD ALSO EXCAVATED. GASOLINE RESIDUALS REMAIN IN SOIL, SOLVENT RESIDUAL <br /> REMAINS IN SOIL AND GROUNDWATER. GASOLINE BELOW DETECTION LIMITS IN GROUNDWATER, LOW <br /> LEVEL DIESEL EXISTS IN GROUNDWATER. <br /> IV. Closure <br /> tion protect existing beneficial uses per the Regional Board Basin Plan? (YES) <br /> F <br /> s com leted corrective ac p 9Ps completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? (YES) <br /> s corrective action protect public health for current land use? (YES) <br /> management requirements: <br /> Should corrective action be reviewed if land use changes? (YES) <br /> Monitoring/Vapor wells decommissioned: (NO) Number Decommissioned: 0 Number retained: 4 <br /> List enforcement actions taken: LEVEL ONE, NOR SENT TO RESPONSIBLE PARTY <br /> List enforcement actions rescinded: <br /> I <br /> r <br /> V. Local Agency Representative Data <br /> EName: ARGARET LAGORIO Title: SUPERVISING REHS <br /> SITE MITIGATION/LOP UNIT IV <br /> iI <br /> + <br /> Vt. Central Valley Regional Water Quality Control Board (RS)Nofification <br /> I 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 /> J <br /> 1 <br />