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1 <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) 160 400 .410 .110 Ethylbenene <.005 1.2 .006 <.0005<,005 3.0 .0095 .0026 <br /> TPH (Diesel) 140 NA NA NA Xylene <br /> Benzene <.005 <.5 .0032 <.0005 MTBE NA 1.4 .0037 .0031 <br /> Toluene <.005 <.5 .0085 <.0005 1,2 DCA NA NA .026 .0064 <br /> Comments: Soil Before results are from MW2 (1322) at 36.5 feet on 1/25/94 that is located next to the former UST area <br /> which was over-excavated in August 2002. Soil After results are from the soil sample of the bottom of the over-excavation <br /> area PB-M at 19.5 feet collected 8/20/02. Because of the remaining contamination, the existing monitoring wells were <br /> sampled and 1,2 DCA analysis was performed since it had not been done prior to closure of the UST's removed in 1991. <br /> There was low levels of contamination in the groundwater including 1,2 DCA so the 1991 UST investigation was reopened. <br /> Water Before results are from MW2 on 10/3/02. Water After results are from MW2 on 10/25/05. The lateral and vertical <br /> extent of the groundwater contamination was defined. The SFBRWQCB Environmental Screening levels for soil are not <br /> exceeded so a risk assessment is not required. Compliance with the Public Participation requirements in Section 2728 of <br /> the California Code of Regulations has been met. Site is paved and is a Used Car Sales lot. <br /> 11 <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? No <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: 5 MW's & 10 VEW's <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 List enforcement actions rescinded: 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: <br /> VI. Central Valley Regional Water Qua i y 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 />