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i 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 /> Contaminant Soil Before (ppm) Water (ppm) Contaminant Soil Before <br /> After Before After (ppm) Water (ppm) <br /> TPH (Gas) 2.5 <1.0 Before <br /> After Before After <br /> TPH (Diesel) 140 <1.0 <.05 Xylenes 0.73 <,005 <.0005 <br /> Benzene 0.14 <.005 <.0005 Ethylbenzene 0.07 <.005 <.0005 <br /> Oil&Grease NA NA NA <br /> Toluene 0.75 <.005 <.0005 Heavy Metals NA NA NA <br /> MTBE <br /> Comments: 'Soil before' results are from dispenser and piping samples collected at the tank removal on 7/9/97; depth was <br /> 4 feet below grade. *Subsequent detection of MtBE in a soil sample collected on 2/3/99 at 7.5 feet bsg, beneath a broken <br /> product line, was 10.0-ppm. 'Soil after' results from borings installed on 3/7/00. Water results from the only water sample <br /> collected at the site, which was from boring SB-4 on 3/7/00. —NO REMEDIATION WAS PERFORMED AT THIS SITE-- <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: 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 List enforcement actions rescinded: NONE 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: SUPERVISOR, SITE MITIGATION UNIT <br /> Signature: Date: •� l q )p <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 /> 177 <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 />