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Case Closure Summary : Exhibit N P_ 1 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 BeforeAfter Before After <br /> TPM (Gas) 57ppm ND NA ND Ethylbenzene 0.6 ppm ND NA ND <br /> Toluene 1.1 ppm 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 /> 5 <br /> No remediation required. Soil before results were from soil sampled at the time of UST removal. Soil and groundwater after <br /> results were from preliminary assessment borings. Only one boring showed MTBE in water. No risk determined by well <br /> survey; Port of Stockton is long existing industrial area. <br /> F <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?Yes <br /> Monitoring wells decommissioned: NA Number Decommissioned: NA Number retained: 0 <br /> List enforcement actions taken: NOR letter sent by EHD <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name. Donna Heran Title: Director of Environmental Health <br /> Signature: V-Y� Date: Z -/Lt- <br /> VI.. <br /> /L f-VI.. Central Valley Regional Water Quality Control Board (R$) Notification <br /> Date Submitted to RB: 10/28/98 Response Date: <br /> RB Staff: Mark List Response No response by 12/09/98 <br /> Title: Engineering Geologist <br /> VII, Additional Comments. Data, etc. <br /> Soil does not evidence contamination except lead at 14 ppm. Groundwater evidenced MTBE in one boring sample. <br /> 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 /> d <br />