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n Case Closure Summary Page 2 � <br /> L ing Underground Fuel Storage Tank Prc 'n <br /> 111 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) 670' 670 ND' ND' Ethyl Benzene 165 16 ND ND <br /> TPH (Diesel) 310002 31000 ND ND Xylenes 448 44 ND ND <br /> Benzene 0.68' 0.68 ND ND Oil & Grease ND8 ND NA NA <br /> Toluene 2.1` 2.1 ND ND Lead ND' ND NA NA <br /> Comments: <br /> '- Soil contamination as gasoline was detected 11123/94, soil boring TSB-4-3. <br /> 2 Soil contamination as diesel fuel #2 was detected 11/23/94, soil boring TSB-4-3.. <br /> 3• Soil contamination as benzene was detected 11/23/94, soil boring TSB-4-3. <br /> °• Soil contamination as toluene was detected 11/23/94, soil boring TSB-4-3. <br /> 5. Soil contamination as ethylbenzene was detected 11/23/94, soil boring TSB-4-3. <br /> 5. Soil contamination as xylene was detected 11/23/94, soil boring TSB-4-3. <br /> '- All groundwater samples analyzed for TPH as gasoline, diesel and BTE & X are nondetect @ or above 0.05 and <br /> 0.0003 , X at 0.0006 mg/L respectively. <br /> 8• All soil samples analyzed for Oil and Grease are nondetect @ 5000 mg/Kg. <br /> 9• All soil samples analyzed for Tetra Ethyl Lead are nondetect @ 0.5 mg/Kg. <br /> 1 NA - No additional samples submitted or analyzed. <br /> The vertical and lateral extent of residual soil contamination is defined by nine soil borings. (15' ellipse, 32'-54' bgs, <br /> approximately 200 yds'. <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 /> i <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? Yes. <br /> Monitoring wells decommissioned: (None) Number Decommissioned: (0) Number retained: (0) <br /> List enforcement actions taken: NOR sent 10/13/94 <br /> List enforcement actions rescinded: None. <br /> V. Local Agency Representative Data <br /> Name: Donna Heran Title: Director of Environmental Health <br /> Signature: Date: —z(— <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 54A/96 Response Date: <br /> RB Staff: J. Brathovde Response: Ve,,6a 1 q�PloroUa/ cr'f -rkc <br /> Title: Assoc. Eng. Geologist r c 105 ci r e <br /> VII. Additional Comments, Data, etc. <br /> No contaminants detected in groundwater. Low risk soil only closure. <br /> This document and the related a e retained a lead agency as part of the o icia <br /> site file. (8/16/96) Exhibit N Page . . 2 <br /> i � <br />