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Case Closure-Summary Page 2 <br /> L—aking Underground Fuel Storage Tank Pro, :n <br /> ill Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> Lylbenzene <br /> Soil Soil Water Water Contaminant Soil soil Water Water <br /> Before After Before After Before After Before After <br /> (PPm) (Ppb) (ppm) (ppb) <br /> 298 74 520 ND<50 MTBE 83.5 ND<0.02 ND<5 ND<5 <br /> 0.204 ND<0.05 ND<0.3 ND<0.3 Lead ND<50 <br /> 7.Q9 ND<0.05 1.5 ND<0.3 EDB ---- ND<1.0 ---- ND<5 <br /> 2.47 0.12 35 ND<0.3 1,2-DCA ---- -"' -- ND<5 <br /> 14.9 0.56 160 ND<0.3 Oxygenates ND<0.02 ND<0.02 ND<5 ND<5 <br /> i <br /> i <br /> Only one soil sampling collection was performed after the tank pull during the installation of the 3 monitoring wells. <br /> Although some low quantity of contaminants were reported in the soil sample of MW-2 at 5 feet (TPH-g, ethyl-benzene, and <br /> xylems only), deeper soil samples at 10, 15, 20,and 25 feet bsg were all non-detected. Groundwater samples reported <br /> showed no concentrations of 1,2-DCA, EDB, or oxygenates above detection limits. A domestic well existed about 160 feet <br /> northeast of the tank but was not impacted. Most of the trucking facility including the shop and all the aboveground tanks <br /> north of the former UST pit has been dismantled and no longer in service. With the exception of one quarter (May 2000) <br /> where very low concentrations of contaminants were reported since the installation of the monitoring wells in July 1999, all <br /> groundwater sample results have been not detect . Groundwater at the site is protected now and in the future. <br /> Iv. Closure <br /> rSitt <br /> eted corrective action protect existing beneficial uses per the Regional Board Basin Pian? Yes <br /> eted corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes <br /> tive action protect public health for current land use? Yes <br /> ment requirements: noneective action be reviewed if land use changes?Yes <br /> gells decommissioned: NIA Number Decommissioned: 3 Number retained: 0 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran Title: Director of Environmental Health Department <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB)Notification <br /> Date Submitted to RB: July 10, 2003 Response Date: August 11, 2003 <br /> RS Staff: James L. L. Barton Response: CVRWACB concurred that no further action is <br /> Title: Assoc Eng Geologist required. <br /> VII. Additional Comments, Data, etc. <br /> Destruction of the remaining monitoring wells has been completed under permit and inspection. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the <br /> official site file. (08124193) Exhibit N Page 2 of 2 <br />