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Case Closure Summary Page 2 ;} <br /> Leaking Underground Fuel Storage Tank Program <br /> i'. <br /> III Release and Site Characterization Information (continued) <br /> I� 1 <br />{ Maximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> IL <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After 1i Before After Before After <br /> TPN (Gas) 1200 3400 50.0 2.6 Xylene 83 220 7.6 .068 <br /> TPH (Diesel) 180 NA 7.1 < .05 Ethylbenzene 124 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 ;110.6 NA 0.036 NA <br />+. MTBE -:NA NA NA .0024 <br /> 11,2-DCA SNA NA NA .024 <br /> Comments: 2 SEPARATE AREAS WERE REMEDIATED (SITE#1 & SITE#2) SOIL WAS EXCAVATED, <br /> GROUNDWATER WAS EXTRACTED,AND ORC SOCKS WERE PLACED IN ,GROUNDWATER MONITORING WELLS. <br /> 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 3192. SOIL <br /> LFROM <br /> ULTS ARE FROM THE SOIL BORINGS CONDUCTED IN 9194 TO INVESTIGATE THE EXTENT OF <br /> TION REMAINING IN AREAS THAT WERE NOT EXCAVATED. WATER BEFORE RESULTS ARE FROM <br /> A IN 3193 &4193 EXCEPT FOR LEAD WHICH IS FROM 51?E 1 MW2 ON 6192. WATER AFTER RESULTS <br /> ITE 2 MWIIA EXCEPT MTBE WHICH WAS FROM SITE 2 MW3A''`. SEE,CLOSURE REPORT DATED <br /> 3, 1999 PREPARED BY ERM FOR DETAILS. ! a <br /> I 6 <br /> IV. Closure <br /> F <br /> completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? YES <br /> s 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 ;k <br /> ' Site management requirements: NIA <br /> Should corrective action be reviewed if land use changes? YES <br /> Monitoring/Vapor wells decommissioned: -0- Number Decothmissioned: -0- Number retained: 10 <br /> List enforcement actions taken:. LEVEL ONE <br /> List enforcement actions rescinded: <br /> 31 <br /> V. Local Agency Representative Data <br /> Name: MARGARET LAGORIO Title:SUPERVISING'REHSISITE MITIGATION-LOP UNIT <br /> !j <br /> t Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> i <br /> Date Submitted to RB: Response Date: <br /> RB Staff: MARTY HARTZELL Response: <br /> i Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. { <br /> I° <br /> 'j P <br />