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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 <br /> (ppm) Water (ppm)*Conlaminan soil (ppm)—i Water (ppm) <br /> Befor�6 After Before (ppm) <br /> t Before After Before After <br /> B 7 <br /> TPH (Gas) 8300. -1,400. 29. Ethylbenzene <0.005 21. <br /> [Benzene 00 .43 <br /> 7, .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 LIST (#3) at removal Oct 1985, sample "3E-3" at -13' bgs. Soil <br /> removed from LIST pit 1985 to -17bgs, 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-l', July '93 (hottest <br /> TPHg & BTEX groundwater hits for site). Groundwater 'after' on Oct 2009 from newest 'MW-DIS-16', 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 MonitoringNapor/Air Sparge/Ozone wells been decommissioned? yes Number Decommissioned: 59 <br /> Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Donna Heran, REHS Title: Director <br /> Signature: Date: 7-- - <br /> V1. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: March 15, 2010 Response Date: April 8, 2010 <br /> RB Staff: James L.L.:Barton Response: concurrence to NFA <br /> lTitle: -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 investigation at this site is unlikely to benefit the people of Califomia" <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 />