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i <br /> Case Closure Summarly Page 2 "' <br /> king Underground Fuel Storage Tank PrL .3m <br /> III Release and Site Characterization Information (continueld) <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> Contaminant Soil Soil Water Water Contaminant Soil Soil Water Water <br /> Before After Before After Before After Before After <br /> (ppm) (ppb) (Ppm) (ppb) <br /> 7PH (Gas) 298 14 520 ND<50 MTBE 834.5 ND<0.02, ND<5 ND<5 <br /> Benzene 0.204 ND<0.05 ND<0.3 ND<0.3 Lead ND<50 <br /> Toluene 7.09 ND<0.05 1.5 ND<0.3 EDB ---- ND<1.0 ---- ND<5 <br /> Ethylbenzene 2.47 0.12 35 ND<0.3 1,2-DCA ---- ---- ND<5 <br /> Xylenes 14.9 0.56 160 ND<0.3 Oxygenates ND<0.02 ND<0.02 ND<5 ND<5 <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 i <br /> showed no concentrations of 1,2-DCA, EDB, or oxygenates above detection limits. A domestic well existed about 160 feet I <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 USTP�it 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 /> 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?Yes <br /> Monitoring wells decommissioned: NIA Number Decommissioned: 0 Number retained: 3 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded. None <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Site Mitigation Unit Supervisor <br /> Signature: Date: -1116163 <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: Assoc Eng Geologist <br /> G VII. Additional Comments, Data, etc. <br /> Destruction of the remaining monitoring wells under permit and i 1 spection is required before final no-further-action status <br /> could be granted. <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 />