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Case Closure Summary Page 2 <br /> (N-4ing Underground f=uel Storage Tank Prod m <br /> i <br /> IIf% 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) 840 NA 190 ND Ethylbenzene 45 NA 21 ND <br /> TPI{ (Diesel) NA NA NA I NA Xylene 83 NA . 22 ND <br /> Benzene 16 NA 31 ND Oil & Grease NA NA NA NA I <br /> Toluene 17 NA 49 ND Heavy Metals NA NA NA NA <br /> Mineral Spirits NA NA NA NA Lead 11 NA 6.6 NA I <br /> MTBE 029 <br /> Comments (Depth of Remediation, etc.): J <br /> Groundwater monitoring was 1conducted from 4125189 to 12121195. Initial borings had free product. Reported concentrations 1 <br /> of benzene went from 1240 {ppb to ND without any form of active remediation. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board <br /> Basin Plan? (Yes) <br /> Does completed corrective action protect potential beneficial uses <br /> per the Regional Board <br /> 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 wells decommissioned: (Yes) Number Decommissioned.6 Number retained: 0 <br /> List enforcement actions taken: NOR. sent <br /> List enforcement actions rescinded: None <br /> V. Local .Agency .Representative Data <br /> Name: Donna Heran Title: Director of Environmental Health <br /> Signature: 1v�c Date: I �- 9 (c <br /> ,J <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: J. Brathovde Response: <br /> Title: Assoc Eng Geologist <br /> VII. Additional Comments, Data, etc. <br /> This document and t o related a e retained y the lead agency as part of the official <br /> site file. (08124193) Exhibit IN Page 2 of 2 <br /> - i <br />