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' Case Closure Summary Page 9 <br /> beaking Underground Fuel Storage Tank Dram <br /> III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations - - Before and After Cleanup <br /> Contaminant Soil I(ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 6070# # ND ND Ethylbenene 133# ND ND <br /> Benzene 953# # ND ND Xylene 681# ND ND <br /> Toluene 551# # ND iND MTBE *3.3 ND ND <br /> Comments: <br /> #-Soil data from borehole B-1 at a depth of 25' bgs, contaminants documented at 60'bgs less than 1ppm in soil. <br /> Confirmation borehole MWA was installed south of the contaminant mass, as such verification of SVE effectiveness unknown. <br /> "MTBE detected in three soil samples from two boreholes at 3.3 ppm, .1 and .01 ppm as deep as 61' bgs. TBA detected in <br /> borehole MWA at.015 ppm at 61' bgs. <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? NO <br /> Monitoring/Vapor wells decommissioned: NONE Number Decommissioned: NONE Number retained: 1 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: Donna Heran m�r ru Title: Director of Environmental Health /Su�v15„ <br /> Signature: Date: 4 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: MARK LIST Response: <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments. Data, etc. <br /> =SOILNLY <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 />