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3.2 Utility Clearance <br /> At least two working days prior to commencing field activities, Underground Service Alert <br /> (U.S.A.) will be contacted to field locate buried utility lines at the planned drilling and trenching <br /> locations. All planned work locations will be marked in white paint as required by U.S.A. U.S.A. <br /> will contact all utility companies that may have buried lines in the area and notify them of the <br /> intent to conduct a subsurface investigation. The utility companies or their agents will field locate <br /> their utility lines in public rights-of-way by clearly marking them with paint. <br /> 3.3 Drilling Activities <br /> Borings for SVE and monitoring well installations will be advanced using a truck mounted drill <br /> rig equipped with hollow-stem auger equipment. The upper five feet of each drilling location will <br /> be hand-augered to prevent damage to potential buried utility lines. The hollow-stem auger <br /> equipment consists of continuous flight augers connected to a drill bit at the bottom. Use of <br /> hollow-stem augers allows undisturbed soil samples to be collected through the augers in advance <br /> of the drill bit. The augers will be advanced to the desired depth of soil sample collection and the <br /> split-spoon soil sampler is lowered through the hollow stem for driving the sampler. Past work <br /> onsite with drilling in 1993 to 1996 has demonstrated that there to be limited trouble with heaving <br /> sands (i.e., clean sand that flows into the augers due to hydrostatic pressure) in the shallow <br /> saturated zone above 60 feet bgs. If problems with heaving sands are encountered during soil <br /> sampling, it may be necessary to add water to the drill column to overcome the hydrostatic <br /> pressure allowing the soil sampler to be advanced to the desired sample depth. If soil sampling is <br /> not required,then a wood plug can be placed at the bottom of the drill stem, the boring drilled to <br /> total depth and the wood plug physically dislodged to allow for well construction through the <br /> augers. <br /> Environmental/LNC/Workplan/Appendix 2.wpd 3 <br />