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Landfill Gas Migration Monitoring Well Installation Report October 2009 <br /> Foothill Landfill Project No. 03160203 <br /> 2.0 FIELD WORK <br /> .1 Permitting and Health and Safety <br /> Vector was not responsible for any permitting. LFG Control Corporation (LFG <br /> Control) was responsible for obtaining permits from EHD to drill and install the <br /> landfill gas migration monitoring wells, which required submission of a Health and <br /> Safety plan. Vector representatives attended a health and safety meeting for the <br /> project, held by San Joaquin Public Works on July 20, 2009 at the North County <br /> Landfill. <br /> 2.2 Landfill Gas Migration Monitoring Well Installation <br /> Landfill gas migration monitoring wells (SG-102 through SG-125) were installed by <br /> LFG Control at the FSL between July 29 and August 17, 2009. Table 1 presents the <br /> as-built probe construction dimensions for the LFG monitoring probes. The <br /> locations of the LFG migration monitoring wells were staked in the field by San <br /> Joaquin Public Works personnel prior to drilling activities (Table 2). LFG Control <br /> subcontracted the drilling to: PC Exploration out of Rocklin, California, who used <br /> two hollow stem auger rigs (Mobile B-61 and Ingersoll Rand A-400); Technicon out <br /> of Fresno, California, who used one hollow stem auger rig (CME-55); and Westex <br /> Drilling out of Clarksburg, California, who used one air rotary rig (Star 30k). The <br /> outer diameter of the hollow-steam augers was 8 inches, and the outer diameter of <br /> the drive casing used by the air rotary rig was 8.5 inches. The total boring depths of <br /> the holes ranged from 63 ft to 170 ft, and the deep probes were installed at depths <br /> ranging from 63 feet to 166 feet below ground surface. <br /> Vector representatives were onsite during all drilling and well construction. EHD <br /> staff were onsite during well construction and backfill activities to inspect the probe <br /> installation and to confirm probe construction met permit specifications. Soil <br /> cuttings from drilling all wells were spread out on site. <br /> Vector Engineering, Inc. • 143E Spring Hill Drive•Grass Valley, CA 95945- (530)272-2448 <br /> 2 <br />