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Case Closure Summary : Exhibit N P, .)I of 2 <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 Soil Water Water Contaminant Soil Soil Water Water <br /> Before After Before After Before After Before After <br /> TPH (Gas) 57ppm ND NA ND Ethylbenzene 0.6 ppm ND NA ND <br /> Toluene 1.1ppm ND NA ND Lead 7 ppm 14 NA ND <br /> MTBE NA ND NA 120ppb <br /> Xylene 5ppm ND NA ND <br /> Benzene <.250 ND NA ND <br /> PPM <br /> No remediation required. Soil before results were from soil sampled at the time of UST removal. Soil and=be <br /> results were from preliminary assessment borings. Only one boring showed MTBE in water. No risk deter <br /> survey. Port of Stockton is long existing industrial area. <br /> Iv. ;Closure <br /> Does completed ed corrective action protect existing beneficial uses per the Regional Board Basin Plan?"'Yes <br /> Does completed correg <br /> protect potential beneficial uses per the Regional Board Basin Plan? Yes <br />' tion protect <br /> put <br /> health for current {and use? Yes <br /> Does <br /> corrective ac <br /> Site management reqone <br /> i Should corrective actiwed if land use changes?Yes <br /> Monitoring wells decommissioned: NA Number Decommissioned: NA Number retained: 0 <br /> List enforcement actions taken: NOR letter sent by EHD <br /> 5 List enforcement actions rescinded: None <br /> f V. Local Agency Representative Data <br /> {' Name: Donna Heran <br /> Title: Director of Environmental Health <br /> Signature: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> ' <br /> FDateSubmitted to RB: Response Date: <br /> Response <br /> aff: <br /> VII. Additional Comments, Data, etc. <br /> l <br /> a <br /> Soil does not evidence contamina#ian except lead at 14 ppm. Groundwater evidenced MTBE in one boring sample. <br /> ,I This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the <br /> official site file. (08124193) Exhibit N Page 2 of 2 <br />