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Case Closure Summary Page 2 <br /> • Ding Underground Fuel Storage Tank Pro <br /> III Release and Site Characterization Information (continued) <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 Xylene ND NO ND NO <br /> Benzene ND ND ND5 ND Oil & 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 2123/95 are nondetect @ or <br /> above 10 mg/Kg. <br /> '- Soil contamination as diesel fuel #2 was detected on 5123/90 at the time of tank removal, no TPH as gasoline has been <br /> detecedt at this site @ or above 10 mg/Kg. <br /> I *T2-South on 5/23190, @ 9300 mg/Kg at 1 V bgs. ("Soil sample identification number provided) <br /> 3. All soil samples analyzed for BTEX have been nondetect @ 500 ug/Kg for 5/23190 tank pit samples and nondetect @ 0.06 <br /> mg/Kg for confirmation soil borings on 2123195. <br /> a. Greatest concentration observed in MW-2 on 5126/95, 0.53 mg/L as TPH diesel. <br /> 5. All groundwater samples analyzed for BTEX @ 0.5 ug/L are nondetect. <br /> s_ All soil samples analyzed for Oil and Grease are nondetect @ 5000 mg/Kg on 5/23190, no subsequent samples submited. <br /> '- All soil samples analyzed for Tetra Ethyl Lead are nondetect @ 0.5 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 per 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 /> Vl. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: �� �� , Response Date: None. <br /> RB Staff: J. Brathovde Response: <br /> Title: Assoc. Eng. Geologist <br />