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�^ Treatment and Disposal of Affected "4aterial: <br /> Material Amount(Units) Action (Treatment or Disposal wlDes Ination) Date <br /> Tank(s) 6 Hauled offsite and recycled, Levin Scrappers, Stockton 2187 <br /> Piping unknown Same as UGTs <br /> Free Product None <br /> Soil --400 cubic yards Aerated on site, resampled, and used as pit backfill 12189 <br /> Groundwater Unknown discharged to surface Ongoing <br /> Barrels Unknown Recycled Ongoing <br /> III 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 Before After <br /> Ih TPN (Gas) 1,880.(T-3) 640.(HP-2 355*(T-5) <.05 Ethyl-benzene Not testd 11 Not testd <0.0005 " <br /> TPH (Diesel) 330.(T-5) <0.01 2.3*(T-5) not testd Xylene 33.(T-3) 41 (HP-2) 13.7*(T-5) <0.0005 <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) <0.005 O&G not testd not testd 120 (MW1, 5(MW1 <br /> - 3/90) 6/90) <br /> MTBE not testd ND (HP2) not testd <0.0005 <br /> Comments NOTE. GROUNDWATER RESULTS IN PARTS PER MILLION! *="Before"groundwater samples are <br /> ` rabs'from open UST its at time of tank removal—and shown as "T-_", for"tank"and#from Feb, 1987. Only <br /> 9 P p <br /> n treat low flow, 1.8 to 2.0 liters/da began <br /> H doPunches HP and MW-7 laced in former UST#4 8 5 pit. Pump and ( Y1 9 <br /> v <br /> ( 1 P <br /> May 4991 and off after Second Quarter-1994, under CVRWQCB approval. Onsite(6) production wells, and offsite (1) <br /> irrigation well (Lopez) all non-detect for petroleum. <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? RECOMMEND YES <br /> Have the Monitoring/Vapor wells been decommissioned? NOT YET Number Decommissioned: <br /> Number retained: 7 <br /> List enforcement actions taken: NOR, 01/1411991 <br /> List enforcement actions rescinded: NIA <br /> V. Local Agency Representative Data <br /> Name: Donna Heran 1 Margaret Lagorio Title:Director of Environmental Health 1 LOP Supervisor <br /> Signature: „� Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: Marty Hartzell Response: <br /> Title:. Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> This document and the related CASE CLOSURE LETTER; shall be retained by the lead agency as part of the official site file. <br />{ <br /> Ml/ 12/99 <br /> t <br />