Laserfiche WebLink
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 /> FBIenzene <br /> minant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm)Before After Before After Before After Before Afteras) 160 400 .410 .110 Ethylbenene <.005 1.2 .006 <.0005iesel) 140 NA NA NA Xylene <.005 3.0 .0095 .0026<.005 <.5 .0032 <.0005 MTBE NA 1.4 .0037 .0031e <.005 <.5 .0085 <.0005 1,2 DCA NA NA .026 .0064 <br /> Comments: Soil Before results are from MW2 (B22) 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 /> LLextent <br /> at 19.5 feet collected 8/20/02. Because of the remaining contamination, the existing monitoring wells were <br /> nd 1,2 DCA analysis was performed since it had not been done prior to closure of the UST's removed in 1991. <br /> s low levels of contamination in the groundwater including 1,2 DCA so the 1991 UST investigation was reopened. <br /> fore results are from MW2 on 10/3/02. Water After results are from MW2 on 10/25/05. The lateral and vertical <br /> he groundwater contamination was defined. The SFBRWQCB Environmental Screening levels for soil are not <br /> so a risk assessment is not required. Compliance with the Public Participation requirements in Section 2728 of <br /> nia Code of Regulations has been met. Site is paved and is a Used Car Sales lot. <br /> IV. Closure <br /> [FDoes <br /> ompleted corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes <br /> ompleted corrective action protect potential beneficial uses per the Regional Board Basin Plan? No <br /> orrective action protect public health for current land use? Yes <br /> anagement requirements: None <br /> rShould corrective action be reviewed if land use changes?Yes <br /> itoring/Vapor wells decommissioned: No Number Decommissioned: 0 Number retained: 5 MW's & 10 VEW's <br /> 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 List enforcement actions rescinded: 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: 6 I� <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 />