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Case Closure Summary Page 3 <br /> Leaking Underground Fuel Storage Tank Program <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) 25,000 7,200 .220 <.050 Xylene 2,900 1,300 .015 <.0005 <br /> TPH (Diesel) 1.3 1.3 .320 .280 Ethylbenzene 530 200 .0029 <.0005 <br /> Benzene 270 170 .076 <.0005 Oil&Grease 210 210 ND ND <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 /> • I <br /> c <br /> IV. Closure i <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 /> I <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 /> MonitoringNapor wells decommissioned: (YES) Number Decommissioned: 4 Number retained: 0 <br /> List enforcement actions taken: LEVEL ONE, NOR SENT TO RESPONSIBLE PARTY <br /> i <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> Namp: DONNA HE N Title: REHS, DIRECTOR OF ENVIRONMENTAL HEALTH <br /> stature: Date: <br /> jo 91 3 <br /> VI. Cntr Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 07/17198 Response Date: 08/19198 <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 /> f <br />