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i <br /> Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> III. Release and Site Characterization Information continued <br /> Maximum Documented.Contaminant Concentrations-- Before.and After Cleanup <br /> 1 <br /> Contaminant Soil Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) <br /> After Before After After Before After <br /> TPH (Gas) 1,000 <20.0 0.21 Xylene 14.0 <0.20 <0.002 <br /> TPH (Diesel) NA - NA NA Ethylbenzene 0.3 <0.20 <0.0022 , <br /> Benzene <0.025 <0.20 <0.001 Oil&Grease NA NA - NA <br /> Toluene 0.2 <0.20 <0.002 Pb 2.1 NA NA <br /> MTBE 92.9 120 0.39 <br /> Comments: THE SOIL BEFORE CONCENTRATIONS ARE FROM A SOIL SAMPLE (TP-1/21) COLLECTED AT 21 FEET <br /> BGS BENEATH UST AT THE TIME OF REMOVAL, EXCEPT MTBE SOIL CONCENTRATION IS FROM SB-1 AT 25 FEET <br /> BGS IN THE AREA OF FORMER USTs. SOIL CONFIRMATION SAMPLES WERE NOT TAKEN AFTER THE <br /> COMPLETION OF THE GROUND WATER EXTRACTION REMEDIATION..GROUND WATER BEFORE AND AFTER <br /> CONCENTRATIONS ARE FROM WELL P-1 LOCATED 5 FEET WEST OF THE FORMER USTs. <br />! IV. Closure <br /> Does completed corrective action protect existing beneficial useper 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 /> - I <br /> Site management requirements: NA <br /> Should corrective action be reviewed if land use changes?YES <br /> Monitoring/Vapor wells Decommissioned: Yes Number Decommissioned: 20 Number retained: 0 <br /> List enforcement actions taken: NOR SENT TO RP <br /> List enforcement actions rescinded: NA <br /> V. Local A ency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: Date: _ Z <br /> ..,..- - ll� <br /> VI. Central Valle Regional Water Q_uali Control Board RB Notification <br /> Date Submitted to RB: 12/13/2011 Response Date: 12/21/2011 <br /> RB Staff: J. Barton Response: No Further Action Required Concurrence <br /> Title: Eng. Geologist <br /> VII. Additional Comments, Data, etc. <br /> i <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br /> I <br /> it <br /> Page 2 <br /> I' <br />