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i <br /> Case Closure Summary Page 2 v <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) 6200 3130 0.516 <.05 Xylenes 730 194 0.057 <.0003 <br /> TPH (Diesel) NA NA NA NA Ethylbenzene 140 30.4 0.01 <.0003NA NA <br /> Benzene 2.64 ND 0.062 <.0003 Oil&Grease NA NA <br /> Toluene 220 1.9 0.042 <.0003 Heavy Metals ND NA NA NA <br /> MTBE 8.0 ND 0.22 <.0005 <br /> Comments: Soil before results from piping removal resamples. Soil after results from confirmation soil borings, prior to the <br /> final phase of remediation. Water before results from MW1 on 4118100. Water after results from MW1 on 11126104. <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: 6 <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 List enforcement actions rescinded: NONE 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: -7 j bs <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 Response: <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> Estimated mass of 1,013 gallons TPH-g removed from the vadose zone of the site by soil vapor extraction. An estimated <br /> 56 gallons of TPH- remains in the soil. <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 />