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<br />Soil Investigations for Data Collection in the Delta <br />Initial Study/Proposed Mitigated Negative Declaration 9 <br />2.1 On-Land Soil Boring Equipment <br />Vehicles at each Impact Area during the investigation may include a drill rig, support <br />vehicles for drillers, a water truck, a liftgate truck, a tractor-trailer lowboy truck, traffic <br />control trucks, and passenger vehicles (assume 1 drill rig and up to 17 other vehicles <br />occasionally). The specific drill rig mobilized to the Impact Area will be dependent on <br />access conditions and the purpose and depth of the soil boring. Drill rigs that will be <br />used include truck-mounted rigs and track-mounted rigs (see Figures 3 and 4). The drill <br />rigs are powered by a 120 to 550 horsepower diesel engine. Track-mounted rigs will be <br />used if needed to minimize access impacts over soft ground; these rigs will be hauled to <br />the site by a lowboy tractor-trailer rig. The Impact Area for any given soil location is <br />considered the soil investigation site itself and the area required for parking various field <br />personnel. While this complete list of vehicles may be used, not all of them would <br />necessarily be required. For example, many of the Impact Areas will likely not require a <br />tractor-trailer lowboy truck or traffic control trucks to safely direct traffic around any <br />temporary partial road closures. <br /> <br />*Source: Central Mine Equipment Company 2019