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Case Closure Summary Page 2 <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 /> ontaminant Soil Before (ppm) Water (ppm) Contaminant Soil Before g�T <br /> After Before After (ppm) <br /> After <br /> PH(Gas) 39,000 54.0 14.0 Xylenes 3100 0.78 <br /> TPH(Diesel) NA NA NA Ethylbenzene 570 0.13 <br /> Benzene 660 0.84 <0.005 Oil&Grease 610 NA <br /> Toluene 2400 2.3 <0.005 MTBE 0.11 0.067 <0.005 <br /> 1,2 DCA NA .083 <0.005 <br /> Comments:SOIL'BEFORE' DATA TPHg & BTEX IS FROM S-6-PL1, 2/10/98. NO CONFIRMATION SAMPLES COLLECTED FOR <br /> SOIL'AFTER' DATA. OIL AND GREASE FROM UST REMOVAL STOCK PILE TAKEN 2/1998. WATER 'BEFORE' DATA FROM VW- <br /> 5D ON 12/13101;WATER'AFTER' DATA FROM VW-5D ON 6/28/11. <br /> IV. Closure <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 /> Does corrective action protect public health for current land use? YES <br /> Site management requirements: NONE <br /> Should corrective action be reviewed if land use changes?YES <br /> Monitoring/Vapor wells decommissioned: YES Number Decommissioned: 20 Number retained: none <br /> List enforcement actions taken: Notice of Responsibility 5/13/88, 1/24/91, 1/23/06, 1/24/06, 6/29/07, 5/7/08 <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> DONNA HERAN, REHS Title: DIRECTOR <br /> Signature: Date: _ Ste—rZ <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: September 26, 2011 Response Date: October 12, 2011 <br /> RB Staff: JAMES L.L. BARTON, PG 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 offlcial site fde. <br />