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III. Release and Site Characteri�on Information <br /> '• Cause and Type of Release: Unknown—Chevron <br /> Unknown-Arco <br /> Site Characterization Complete? Yes Date Approved by Oversight Agency: 6/26/2.012 <br /> Monitoring Wells Installed? Yes—Chevron Number: Proper Screen Interval?YES <br /> Yes-Arco 27—Chevron (16ifiW;11 Remediation) <br /> 45 - Arco 21 MIN; 24 Remediation) <br /> High GW Depth(bgs): Lov;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 a proxirnatel .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 Pan-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 /> April 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 /> Comments: `Soil Before' THPg and Benzene @14', from Chevron Tank on 1/6/89, Toluene; AS613 @ 11-11.5' from Arco <br /> on 5/26/87, Xylenes; AS613 @ 11-11.5' From Arco on 5/26/87, Ethylbenzene; AS1B @ 11-11.5' from Arco on 5/26/87, Lead; <br /> D5 @2_.5' from Chevron on 3/15/99, MTBE; PL2 @ 2.5" from Chevron on 3/8/99. No Soil 'Before' data for TPHd, 1, 2- DCA, <br /> TPHmo. `Soil After' TPI-Ig; AS10 @ 10.5-11' frorn Arco on 2/27/06. BE-fX, INTBE, and 1, 2- DCA from MW2R @ 15'from <br /> Chevron on 2/27/06. TPHmo and Lead not analyzed for'Soil After'. 'Water Before' TPHg from Arco E-10 on 6/18/96, <br /> Benzene from Chevron MUN1-10 on 8/5/93, Toluene from Arco E-9 on 9/11/95, Xylenes and Ethylbenzene frorn Arco E-10 <br /> on 3/18/96. `Water After' TPHg, Benzene, Toluene, Xylenes, Ethylbenzene and MTBE from Arco E-10 on 1/12/12, <br /> 1, 2 -DCA; E10 from Arco on 4/24/09. TPHmo and Lead not analyzed for'Water After' for Chevron and Arco site. NIA— Not <br /> Analyzed. <br />