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_ I <br /> y Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> Ill. Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> Contaminant Soil Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) <br /> After Before After After Before After <br /> TPH (Gas) 370 X1.0 NA NA Xylenes 2.4 0.018 NA NA <br /> TPH (Diesel) NA 16 Ethylbenzene 0.9 <0.005 <br /> Benzene <0.05 <0.005 Oil &Grease NA NA <br /> Toluene 5.9 X0.005 Heavy Metals <0.005 . NA <br /> MTBE <0.01 <0.005 <br /> Comments: SOIL BEFORE' DATA IS FROM BENEATH THE PIPING AT 2 FEET BELOW GRADIS ON 12123198. SOIL <br /> 'AFTER'SAMPLES WERE COLLECTED FROM SOIL BORINGS INSTALLED ON OCTOBER 28, 2008. NO <br /> GROUNDWATER SAMPLES HAVE BEEN COLLECTED; DEPTH TO WATER IN THE AREA IS APPROXIMATELY70-80 <br /> FEET BELOW SURFACE GRADE. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? YES <br /> - i <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 uses changes?YES <br /> Monitoring/Vapor wells decommissioned: 0 Number Decommissioned: 0 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: MARGARET LAGORIO, REHS Title: PROGRAM COORDINATOR, UNIT IV <br /> Signature: Date: ;21 d 9 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: JAMES L.L. BARTON, PG Response: <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> The site is an operating airport, with no plans to change site usage in the future. Soil sample results from the Geoprobe <br /> soil borings installed on October 28, 2008 pass the SFBRWQCB Environmental Screening Levels. <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 />