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r <br /> r <br /> 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 (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH(Gas) 83 1.4 .390 <.05 Ethylbenene .64 .013 .0021 <.0005 <br /> TPH(Diesel) 22,000 230 .180 <.05 Xylene 1.4 .15 .0035 <.001 <br /> Benzene .75 .024 .0074 <.0005 MTBE .65 .65 .0068 <.0005 <br /> Toluene .099 .099 <.0005 <.0005 1.2 DCA NA NA. .031 <.0005 <br /> Comments: Soil Before data is from soil beneath the UST system when it was removed on 11/21/97. Soil After data for <br /> TPH is from soil samples collected from the excavation on 11/26/97 and BTEX is from dispenser#2 on 11/21/97. Water <br /> Before data is from a grab sample from S133 on 5/22/03. Water After is from the monitoring wells on 10/1/08. There have <br /> been no confirmed results of contamination in the monitoring well water samples. The greatest soil contamination was <br /> removed by excavation on 11/26/97. Another UST system is currently being operated at the 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: Yes Number Decommissioned: 3 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature:L Date: 02/26/10 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 11/16/09 Response Date: 12/16/09 <br /> RB Staff: James L.L. Barton Response: Concurrence <br /> Title:Associate 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 official <br /> site file. <br />