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Case Closure Summary Pa <br /> Leaking Underground Fuel Storage-Tank Program <br />' III Release acid 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) 1200 3400 50.0 2.6 Xylene R 83 220. -7.6 .068 <br /> TPH (Diesel) 180 NA 7.1 < .05 Ethylbenzene 24 47 1.9 .060 <br /> Benzene 31.0 4.8 16.0 .260 Oil &Grease NA NA NA NA <br />` Toluene 31.0 5.4 5.8 .010 Lead 10.6 unk 0.036 0.03 <br /> MTBE unk" unk unk <.020 <br /> 1,2-DCA NA NA NA .024 <br /> Comments: 2 SEPARATE AREAS WERE REMEDIATED (SITE##1 &SITE##2). SOIL WAS EXCAVATED, <br /> GROUNDWATER IWAS EXTRACTED,AND ORC SOCKS WERE PLACED IN GROUNDWATER MONITORING WELLS. , <br /> i MTBE AND 1, 2—;DCA ANALYSIS WAS CONDUCTED ONLY AFTER CLEANUP. SOIL BEFORE RESULTS ARE <br /> FROM THE INVESTIGATION CONDUCTED AT SITE 2 WHEN MONITORING WELLS WERE INSTALLED IN 3/92. SOIL <br /> AFTER RESULTS:�ARE FROM THE SOIL BORINGS CONDUCTED IN 9194 TO INVESTIGATE THE EXTENT OF <br /> CONTAMINATION REMAINING IN AREAS THAT WERE NOT EXCAVATED. WATER BEFORE RESULTS ARE FROM <br /> SITE 2 MW1A IN 3193 &4193 EXCEPT FOR LEAD WHICH IS FROM SITE 1 MW2 ON 6192. WATER AFTER RESULTS <br /> ARE FROM SITE 2 MW1A EXCEPT MTBE WHICH WAS FROM SITE 2 MW3A. SEE CLOSURE REPORT DATED <br /> OCTOBER 13, 1999 PREPARED BY ERM FOR DETAILS. j <br /> IV. Closure <br /> a . <br /> Does completed to: 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: NIA <br /> Should corrective action be reviewed if land use changes? YES <br /> Monitoring/Vapor wells decommissioned: 10 Number Decommissioned: 10 Number retained: 0 <br /> :i <br /> List enforcement actions taken:. LEVEL ONE <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> Name: DONNA HERAN Tltle:DIRECTOR OF ENVIRONMENTAL HEALTH <br /> Signature: Date: r <br /> Vt. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 1212199 Response Date: 3/1/2000 <br /> .t } <br /> RB Staff: MARTY,;HARTZELL 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 />