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f <br /> Case Closure Summary Page ,' - <br /> �aking Underground Fuel Storage Tank Pr4.,,pm FILE COPY <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 /> ITPH(Gas) 6070# # ND ND Ethylbenene 133# ND ND <br /> Benzene 953# r ND ND Xylene 681# ND ND <br /> Toluene 551# # ND ND 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 MW-1 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 MW-1 at.015 gpm at 61'b s. <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: Yes Number Decommissioned: 5 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 List enforcement actions rescinded: NONE 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 Title: Director of Environmental Health <br /> Signature: Date: �7 <br /> r� !`c <br /> Vi. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 815199 Response Date: 9113199 <br /> RB Staff: MIKE SMITH Response: CONCURRENCE <br /> Title: ENGINEERING GEOLOGIST <br /> VIE. Additional Comments, Data, etc. <br /> SOIL ONLY <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 />