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{ 11 <br /> Treatment and Disposal of Affecter-'-'aterial: <br /> !k <br /> Material Amount(Units) Action (Treatment or Disposal w/Destination) Date <br /> Tank(s) 6 Hauled offsite and recycled, Levin Scrappers,Stockton 2187 <br /> l <br /> Piping unknown Same as UGTs 1 <br /> $ <br /> Free Product None <br /> Soil -400 cubic yards Aerated on site, resampled, and used as pit backfill lygg <br /> Groundwater Unknown discharged to surface` Ongoing <br /> Barrels Unknown Recycled <br /> Ongoing <br /> f� <br /> i <br /> i <br /> III 1i Release and Site Characterization Information continued <br /> Maximum Documented Contaminant Concentrations - - Before and After Cleanup . <br /> Contaminant Soil Before (ppm) Water (ppm) Contaminant Soil Before (ppm)After Water (ppm) <br /> After Before After ;l. Before After <br /> TPH(Gas) 1,880.(7-3) 640.{HP-2 355*(T-5) <.05 ;, Ethyl-benzene Not testd 11 Not testd <0.0005 k <br /> TPH(Diesel) 330.(T-5) <0.01 2.3*(T-5) not testd Xylene 33.(T-3) 41 (HP-2} i3.7*(T-5) <O.i <br /> 0005 <br /> Benzene 1.7(T-2) 5.3(HP-2) 4.8*(T-5) <0.0005 <br /> Toluene` 11.(T-3) 6.(HP-2) 5.9*(T-5) 10.0005 O&G not testd not testd 120(MW1, 5(MW1 <br /> 3/90) 6190) <br /> pI MTBE not testd ND HP2 not testd <0.0005 <br /> Comments NOTE: GROUNDWATER RESULTS 1N PARTS PER MILLION! *�_"Before"groundwater samples are <br /> `grabs lfrom open UST pits at time of tank removal-and shown as "T--", for "tank"and#from Feb, 1987. Only <br /> HydoPunches(HP)and MW-7 placed informer UST#4&5 pit. Pump and treat(low flow; 1.8 to 2.0 liters/day)began <br /> May 1991 and off after Second Quarter-1994, under CVRWQCS approval.Onsite(6)production wells, and offsite(1) <br /> irrigation w2ll Lo ez)all non-detect for petroleum. <br /> 1V. Closure <br /> F <br /> s completed corrective action protect existing beneficial`uses per the Regional Board Basin Plan? YES <br /> s completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? YES <br /> s corrective action protect public health for current land use? YES <br /> El ' <br /> Site management requirements: NONE i <br /> it <br /> Shouldcorrective action be reviewed if land use changes? RECOMMEND YES <br /> ' k <br /> Have the Monitoring/Vapor wells been decommissioned?. YES Number Decommissioned: 7 <br /> Number retained: 0 <br /> List enforcement actions taken: NOR, 01/14/1991 <br /> 'h <br /> List enforcement actions rescinded: NIA { <br /> ! <br /> V. Local Agency Representative Data <br /> Name: Ibonna Heran/Margaret Lagorio Title:Director of Environmental Health/LOP Supervisor <br /> Signatt ire: pate: 2(, <br /> VI, Central Valle Re Tonal Water Quality Control Board RB :Notification <br /> Date Submitted to RB: January 12, 2000 Response Date: February 29, 2000 <br /> RB Staff: Marty Hartzell Response: Concurrence with NFA <br /> Title% Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> ALL m knitoring wells properly destroy. <br /> ! <br /> This document and the related CASE CLOSURE LETTER, shall be retained by the lead agency as part of the official site file. <br /> MI/12199 <br />