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III. Release and Site Characterization Information <br /> Cause and Type of Release: Unknown—Chevron <br /> Unknown -Arco <br /> Site Characterization Complete? Yes Date Approved by Oversight Agency: 6/26/2012 <br /> Monitoring Wells Installed? Yes—Chevron Number: Proper Screen Interval?YES <br /> Yes-Arco 27—Chevron (16MW;11 Remediation) <br /> 45- Arco 21 MW; 24 Remediation <br /> High GW Depth(bgs): Low Depth: Gradient: North East <br /> Arco 3.92' (PR-2, 3/19/98) Arco 22.19' (E-11, 7/16/91) North <br /> North-West <br /> Most Sensitive Current Use: Potential Beneficial Are Drinking Water Wells Affected? Yes <br /> Aquifer Name: San Joaquin River Basin Is Surface Water Affected? No Nearest Surface Water: Five Mile Slough is <br /> Approximately 1/2 Mile to the North, and Fourteen Mile Slough is approximately .45 Miles to the South. <br /> Off-site Beneficial Use Impacts (Address/Locations): None Report(s)on file with: EHD &GEOTRACKER <br /> Treatment& Disposal of Affected Material <br /> Material Amount(Units) Action(Treatment or Disposal w/Destination) Date <br /> Tanks 4-Chevron Chevron—Disposal not Documented Chevron-1/6/89 <br /> 5-Chevron Chevron—Ecology Control Industries 255 Parr Blvd., 6/19/05 <br /> Richmond, CA 94801 <br /> 1-Arco Arco— Erickson, 255 Parr Blvd., Richmond, CA 94801 Arco-9/23/91 <br /> 4-Arco Arco— Disposal not documented Arco1984,1987 <br /> 1999,2002 <br /> Piping <br /> Free Product <br /> Soil 450 gallons (Arco) BFINasco Landfill, Livermore, CA March30- <br /> A ril 12, 1990 <br /> Groundwater Unknown Ecology Control Industries, 255 Parr Blvd. Richmond, CA 6/9/05 <br /> Rinsate Chevron <br /> Barrels <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) Water (ppm) <br /> After Before After After Before After <br /> TPH (Gas) 3,600 1,000 400 2.3 Xylenes 29,600 <0.001 62 <0.020 <br /> TPH (Diesel) NA NA NA NA Ethylbenzene 1,600 <0.001 9.9 <0.020 <br /> Benzene 31 <0.0005 9.4 0.450 TPHmo NA NA NA NA <br /> Toluene 2,100 <0.001 7.6 <0.02 Lead Pb 35 NA NA NA <br /> 1-2 DCA NA <0.001 NA <0.010 MTBE 124 <0.004 46 <0.067 <br />