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' All equipment utilized during the field activities was washed prior to commencement of work <br /> and between borings to minimize the likelihood of cross-contamination between the borings. <br /> Soil cuttings and decon water generated during the first phase of the field investigation were <br /> ' contained in 280 liter(55-gallon) drums. The borings were back backfilled with neat cement <br /> grout. Drilling and sampling procedures are presented in Appendix C. <br /> The horizontal and vertical locations of the borings were established using a Trimble GPS <br /> PathfmderTm Pro XRS global positioning system (GPS). The GPS utilized a GPS receiver and <br /> ' MSK radio beacon differential receiver. The GPS is reported to have sub-meter precision for <br /> horizontal location of the borings. The vertical precision is reported to be 2 to 5 times that of the <br /> ' horizontal precision. The GPS data were downloaded in the office and Trimble software utilized <br /> to provide differential corrections to the coordinates. GPS data is included with soil sample <br /> analytical data on Tables 1 and 2. <br /> 2.3 Waste Disposal <br /> ' Drill cuttings and wash water generated during the field investigation were contained for <br /> disposal in 208-liter (55-gallon) drums, approved by the United Nations for transport of liquid <br /> ' and solid wastes. The drums will be removed from the site for disposal following approval from <br /> an appropriate disposal facility. ABCO Environmental Services, Inc, a licensed hazardous waste <br /> hauler, will transport soil and wastewater generated during the drilling activities for disposal. <br /> 2.4 Laboratory Analysis <br /> ' The soil samples collected during the direct push drilling phase were submitted to <br /> Creek Environmental Laboratories of San Luis Obispo, California, a California-certified <br /> ' analytical laboratory. The soil samples collected during the HSA drilling phase were submitted <br /> to Twining Laboratories of Fresno, California, a California-certified analytical laboratory. <br /> Chain-of-custody procedures were used to document sample handling and transport from the <br /> ' time of collection to delivery to the laboratory for analysis. The chain of custody forms and <br /> laboratory analytical reports are included in Appendix D. <br /> ' Up to eight soil samples per boring were retained and a total of 38 soil samples were collected <br /> from the soil boring investigations and submitted for laboratory analyses. Two groundwater grab <br /> samples were collected from the HSA borings. The analyses were conducted on a normal <br /> turn-around basis in general accordance with U.S. Environmental Protection Agency (EPA) <br /> ' specified holding times. The analyses were performed in general accordance with the following <br /> EPA methods listed. <br /> ' ;M—GRFPACOMOMsacDP@0021PRAPJMM834160.1ae.dDc 2-3 <br />