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Case Closure Summary Page e 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 (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 4100 558 24 .269 Ethylbenene 154 5.14 1 .0062 <br /> TPH (Diesel) NA NA NA NA ;Xylene. 1200 6.3., 5.1 .0021 <br /> Benzene 88 .3 4.7 .0012 :MTBE NA .03 .270 .055 <br /> Toluene 450 2.36 3.4 x.0003 <br /> Comments: Soil Before results are from the soil beneath the UST's at the time of removal Soil After results for BTEX & <br /> TPH gas are from GP3 between 11 and 17 feet below grade. Although residual contamination is left, results of the deeper <br /> soil at 23 feet below grade are non detect. MTBE result is from MW6-15' in September 2000. .Water Before results for <br /> BTEX & TPH gas are from MW 1, located near the former UST location, in March 1996, and for MTBE are from MW6 on <br /> 1117101. Water After results for BTEX -& TPH gas are from MW1 on 10/13/04 and for MTBE are from MW6 on 10113104. <br /> The lateral and vertical extent of the contamination has been defined andconcentrations in groundwater continue to <br /> decrease. r <br /> ki <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 Pian? 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/Vapor wells decommissioned: No Number Decommissioned: 10 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: <br /> C <br /> V. Local Agency Representative Data <br /> Name: Donna Heran Tiff e: Director of Environmental Health <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> I L <br /> Date Submitted to RB: 1128105 Response Date: 311105 <br /> RB Staff: James L.L. Barton, Response: Concurrence with'No Further Action Required <br /> Title: Associate En ineerin Geologist <br /> VI I. Additional.Comments, Data, etc. <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 /> i <br /> �4 t <br />