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r' i <br /> � Case Closure Summa Page 2 <br /> t,,:aking Underground Fuel Storage Tank Prc,,,am <br /> III Release and Site Characterization Information (continued) DRAFT <br /> Maximum Documented Contaminant Concentrations - - Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppb) Contaminant Soil (ppm) Water (ppb) <br /> Before After Before After Before After Before After <br /> TPH (Gas) ND' ND ND ND Ethyl Benzene ND ND ND ND <br /> TPH (Diesel) 93002 ND 5304 ND Xylen ND ND ND ND <br /> Benzene ND ND ND ND OilB Grease NDB ND NA NA <br /> Toluene ND ND ND ND lead ND ND NA NA <br /> Comments: <br /> All soil samples analyzed for TPH as gasoline and diesel from confirmation soil borings on 2123195 are nondetect @ or <br /> above 10 mg/Kg. <br /> '- Soil contamination as diesel fuel #2 was detected on 5123190 at the time of tank removal, no TPH as gasoline has been <br /> detecedt at this site @ or above 10 mg/Kg. <br /> 2. `T2-South on 5123190, @ 9300 mg/Kg at 11' bgs. ("Soil sample ide tification number provided) <br /> 3. All soil samples analyzed for BTEX have been nondetect @ 500 u /Kg for 5123190 tank pit samples and nondetect @ 0.06 <br /> mg/Kg for confirmation soil borings on 2123195. <br /> 4' Greatest concentration observed in MW-2 on 5126195, 0.53 mg/L a TPH diesel. <br /> 5. All groundwater samples analyzed for BTEX @ 0.5 ug/L are nonde ect. <br /> B. All soil samples analyzed for Oil and Grease are nondetect @ 500 mg/Kg on 5123/90, no subsequent samples submited. <br /> All soil samples analyzed for Tetra Ethyl Lead are nondetect @ C.E mg/Kg on 5123190, no subsequent samples submited. <br /> NA - No additional samples submitted or analyzed.. <br /> The extent of residual soil and groundwater contamination was defined by three soil borings which were completed as <br /> monitoring wells. <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 pe the Regional Board Basin Plan? Yes. <br /> Does corrective action protect public health for current land use? Yes. Current LUD, Heavy Industrial. <br /> Site management requirements: None. <br /> Should corrective action be reviewed if land use changes? No. <br /> Monitoring wells decommissioned: (Yes) Number Decommissioned: (3) Number retained: (0) <br /> List enforcement actions taken: NOR sent 11/28/94 <br /> List enforcement actions rescinded: None. <br /> V. Local Agency Representative Data <br /> Name: Donna Heran Title Director of Environmental Health <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> f Date Submitted to RB: Response Date: None. <br /> RB Staff: J. Brathovde Response: <br /> Title: Assoc. Eng. Geologist <br />