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%./ <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 (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH(Gas) 4100 558 24 .269 Ethy I b enenene 150 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 00003 <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 MW 1 on 10/13/04 and for MTBE are from MW6 on 10113104. <br /> The lateral and vertical extent of the contamination has been defined and concentrations in groundwater continue to <br /> decrease. <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/Vapor wells decommissioned: No Number Decommissioned: 0 Number retained: 10 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising REHS <br /> Signature: Date: , a$ <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: James L.L. Barton Response: <br /> Title: Associate Engineering Geologist <br /> VII. 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 />