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Case Closure Summary : Exhibit N � 2 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 /> Water <br /> Contaminant Soil Soil Water After <br /> Before After Before (ppm) <br /> (ppm) (ppm) (ppm) <br /> TPHdiesel 3.7 580 5.7 1.9 <br /> TPHgas 2,700 2,200 43 10 <br /> Benzene 11 .96 .32 .27 <br /> Toluene 25 43 3.6 .84 <br /> Ethylbenzene 61 36 1.9 .66 <br /> Xylene 250 190 8.3 1.8 <br /> MTBE NA .1 NA <.005 <br /> Soil Before results are from B1. Soil After sample results are from MW4. Water Before sample results are from <br /> MW4 on 5196. Water After results are from MW4 on 6198. See Closure Summary Report—May 1997 and Closure <br /> Summary Addendum 8110199 for details. <br /> SV. 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: 4 Number retained: 0 <br /> List enforcement actions taken: NOR SENT <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: D nna Heran Title: Director of Environmental Health <br /> Signa u e: Date: / Z <br /> V . 'ntral Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 12/06/99 Response Date: 01/06/00 <br /> RB Staff: Marty Hartzell Response: Concurrence <br /> Title: Engineering Geologist <br /> V11. Additional Comments, Data, etc. <br /> Minimal soil and water contamination remaining. �I <br /> I <br />