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V <br /> Leaking Underground Fuel Storage Tank Program <br /> Page 2 <br /> Del Monte Disco Station <br /> III Release and Site Characterization Information continued 110 N. Filbert Street, Stockton <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) 8300. 4.4 1,400. 29. Ethylbenzene <0.005 21. 0.43 <br /> Benzene .04 <0.005 64. 1.8 Xylene 3,340 <0.005 130. 6.8 <br /> Toluene 540. <0.005 110. 0.98 MTBE NA <0.0025 <br /> 1,2-DCA NA 0.100 <br /> Comments: Soil "before"data from northern UST (#3) at removal Oct 1985, sample "3E-3" at—13' bgs. Soil <br /> removed from UST pit 1985 to —17'bgs, aerated on site, and returned to pit. Soil "after" data from "SB-DIS-1" <br /> from 21' bgs in 1991 nearest to UST-#3 soil samples "3E-3". Groundwater 'before' MW-DIS-1', July '93 (hottest <br /> TPI-Ig & BTEX groundwater hits for site). Groundwater 'after' on Oct 2009 from newest 'MW-D IS-1 6', installed <br /> March '09 in core area. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per Regional Board Basin Plan? Yes <br /> Does completed corrective action protect potential beneficial uses per 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 /> Have the Monitoring/Vapor/Air Sparge/Ozone wells been decommissioned? No Number Decommissioned: 0 <br /> Number retained: 53 casings in 48 bore holes 5 nested <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Adrienne Ellsaesser, REHS Title: Acting Program Coordinator <br /> Si ature Date: /� w <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: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> March 26, 2008 and March 9, 2009 SWRCB-CUF 5-year review letters recommended site be considered for <br /> closure "as further investi ation at this site is unlikel to benefit the eo le of California': <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the <br /> official site file. <br /> Mi/ <br />