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,? 1 <br /> t <br /> k <br /> Case Closure Summary.Page.2 n <br /> Leaking.Underground.Fuel Storage.Tank Program t i <br /> Ili 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) 17,000. <,05 <.05 hthyibenene ..390. <.0005 <.0005 <br /> TPH(Diesel) 10. <.05 - <.05 Xylene., :3,000 <;0005. <.0006. <br /> Benzene .9:2. x.0005 <.0005 MTBE .. .160 .004. <001. <br /> Toluene . ..800. <.0005 <.0005 <br /> Comments: Soil Before results.are from.soil beneath the underground storage tanks at the time.of removal on 517199...Soil <br /> vapor extraction was conducted at the site from October.2004 to July 2005 and it is estimated that 192 gallons.of gasoline <br /> were extracted..Soil.samples were.not collected.after operation.of the soil vapor extraction system so there are no.soil after, <br /> results. Water.Before results are from.MW 1.on 11102101..Water.After.results are from.MW 1 R on 07111105:. MTBE nor-any <br /> other contaminants.of.concern.were confirmed.to be in the groundwater. ... <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 publichealth for current land use?,Yes <br /> Site management requirements:.None. .� <br /> Should corrective action.be reviewed.if land use changes?..Yes <br /> MonitoringNaporwells decommissioned:..Yes.Number Decommissioned:,8.. .Number.retained:.0 <br /> 'I <br /> List enforcement actions.taken: NOR. <br /> List enforcement actions rescinded:.. <br /> V..Local,Agency Representative Data <br /> Name:.Donna Heran. Title:.Director.of Environmental Health. <br /> Signature:. Date: <br /> VI..Central Valley Regional Water Quality Control Board (RB)Notification <br /> Date Submitted to.RB: 2122106. Response.Date: 3120106. <br /> R8 Staff:James L.L. Barton Response:Concurrence <br /> Title:Associate En ineerin Geologist: <br /> VIL L.Additional Comments, Data, etc. t <br /> 771 <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 /> 1 <br />