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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) <.25 <1 7.9 <.05 Ethylbenene <0005 <.0005 .033 <.0005 <br /> TPH(Diesel) 21 <5 10 .074 Xylene <.001 <.0005 .2 <.0005 <br /> Benzene <,0005 <.0005 .140 <.0005 MTBE <0005 NA <001 <.0005 <br /> Toluene <.0005 <.0005 .033 <0005 <br /> Comments: The Soil Before results are from the soil beneath the underground storage tanks when they were removed on <br /> 4/25/07. The Soil After results are from the soil collected during installation of the monitoring wells on 4/28/08. The Water <br /> Before results are from the grab sample collected on 5/18/07. The Water After results are from monitoring well MW3 on <br /> 12129/08. <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? No <br /> Monitoring/Vapor wells decommissioned: No Number Decommissioned- 0 Number retained: 3 <br /> List enforcement actions taken. NOR <br /> List-enforcement actions rescinded: <br /> .. . ....... <br /> V. Local Agency Representative Data <br /> Name; <br /> Margaret Lagoro Title. Program Coordinator <br /> Signature: <br /> Date: <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 /> rhe <br /> s �site is now a City of Lathrop sidewalk and adjacent landscape with no plans to change site usage in the future. oiample results from the rn��well installed on 4/28/08 pass the SFBRWQCB Environmental Screening Levels. —] <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 />