SITE INFORMATION AND CORRESPONDENCE

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Lase Closure Summary Page " Nomoaking Underground Fuel Storage Tank Pi.gtam III Release and Site Characterization Information (continued) Maximum Documented Contaminant Concentrations --Before and After Cleanup Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) Before After Before After Before After Before After TPH (Gas) 260 <1 4.1 <0.050 Ethylbenene 0.014 <0.001 <0.013 <0.0005 Diesel 1.3 NA <0.050 NA Xylene 2.4 <0.001 <0.013 <0.0005 Benzene 0.030 <0.001 <0.013 <0.0005 MTBE 0.18 0..002 76.0 <0.0005 Toluene 0.037 <0.001 <0.013 <0.0005 TAME NA <0..001 3.8 <0.0005 Methanol 3.6 2.5 <1.0 <0.200 DIPE NA <0..001 <0.013 <0.0005 Ethanol NA NA <1.3 <0.050 ETBE NA <0..001 <0.013 <0.0005 1,2-DCA NA <0.001 <0.013 <0.0005 TBA NA <0.02 2.8 <0.002 EDB NA <0.001 <0.013 <0.0005 Comments: Soil Before result for gasoline is from dispenser over-excavation soil sample DX-E-7.0 on 10/4/95. Soil Before result for diesel is from soil sample B-2@ 11' on 1/10/96. Soil Before results for benzene and toluene are from soil sample NT-SE-9.0 on 10/4/95. Soil Before result for MTBE is from soil sample B-1 @11'on 1/10/96. Soil Before results for ethyl benzene and xylenes are from soil sample D-5-3.0 on 9/27/95. Soil Before result for methanol is from soil sample MW-7D @ 38' on 1/8/02. Soil After results are from soil sample MW-5D@51' on 1/7/02. Water Before results are from groundwater samples collected from MW-6S on 5/11/04 except for the diesel result that was taken from groundwater samples collected from MW-1 on 2/12/96. Water After results are from groundwater samples collected from MW-6S on 5/21/07 and 11/27/07. NA-not analyzed IV. Closure Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes Does corrective action protect public health for current land use? Yes Site management requirements: None Should corrective action be reviewed if land use changes? Yes Monitoring/Vapor wells decommissioned: No Number Decommissioned: 0 Number retained: 10 List enforcement actions taken: NOR 12/07/95 List enforcement actions rescinded: None V. Local Agency Representative Data E Margaret Lagorio, REHS Title: Program Coordinator Unit IV re: Date: y ) a VI. Central Valley Regio al Water Quai Control Board (RB) Notification Date Submitted to RB: Response Date: RB Staff: James L.L. Barton Response: Title: Associate Engineering Geologist VII. Additional Comments, Data, etc. This document and the related CASE CLOSURE LETTER,Shall be retained by the lead agency as part of the official site file.