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Landfill Gas Migration Monitoring Well Installation Report October 2009 <br /> North County Landfill Project No. 03160203 <br /> 2.0 FIELD WORK <br /> 2.1 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 the health and safety meeting held by <br /> San Joaquin Public Works on July 20, 2009 at the NCSL. <br /> 2.2 Landfill Gas Migration Monitoring Well Installation <br /> Landfill gas migration monitoring wells (SG-11 through SG-22) were installed by <br /> LFG Control at the NCSL between July 20 and July 29, 2009. Table I 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. The probes were completed to depths ranging from 75 <br /> feet to 87 feet using Mobile B-61 and Ingersoll Rand A-400 drill rigs equipped with <br /> 8-inch hollow-stem augers. <br /> Vector representatives were onsite during all drilling and well construction. EHD <br /> staff was onsite during well construction and backfill activities to inspect the probe <br /> installation met permit specifications. Soil cuttings from drilling were spread out <br /> on site after completion of the wells. LFG Control was responsible for transporting <br /> the cuttings from the wells in the mitigation area (SG-11 through SG-16) to an <br /> acceptable disposal site. <br /> 2.2.1 Soil Logging and Sampling <br /> The soil cuttings were logged by Vector personnel while drilling, according to the <br /> 40 Uniform Soils Classification System Description and Identification of Soils Visual- <br /> Vector Engineering, Inc. • 143E Spring Hill Drive • Grass Valley, CA 95945•(530)272-2448 <br /> 2 <br />