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311 A <br /> Limited Environmental Investigation July 16, 1990 <br /> r� ARCO Service Station No. 6100, Tracy, California AGS 30011-1 <br /> F'ELD WORK AND METHODS <br /> Applied GeoSystems conducted field work at this site in accordance with Applied <br /> x� <br /> GeoSystems'- Site Safety:Plan 30041-1S (May 9.' 1990- Applied GeoSystems-standard <br /> methods for field work are described in Appendix A:' The geologist initiated Chain of <br /> Custody Records which accompanied the samples to the analytical laboratories. Copies of <br /> those documents are in Appendix B. <br /> i <br /> Applied GeoSystems was at the site on June 6 through 8, 1990, to observe Wayne Drilling <br /> r. J <br /> of Lincoln, California, drill five 8-inch diameter soil borings (B-1 through B-5). The <br /> locations of the soil borings are shown on Plate P-2. <br /> t <br /> The locations of the borings were selected using ARCO's Preliminary Tank Replacement <br /> 1 <br /> Assessment guidelines described in our Work Plan (Applied GeoSystems, May 15, 1990). <br /> Boring B-1 was drilled approximately 2-1/2 feet from the edge of the tank area near the fill <br /> ends of the product tanks,boring B-2 was drilled on the southwest end of the existing tank <br /> cavity, and boring B-3 was drilled on the northeast end of the existing tank cavity. Borings <br /> 13-4 and B-5 were drilled in the area proposed as the new tank cavity;boring 33-4 was drilled <br /> in the north comer approximately 10 feet from the existing tank cavity,and boring B-5 was <br /> drilled on the southwest side of the proposed area (PIate P-2). <br /> • 5 ' <br /> AAS'/16af 0eosystems <br />