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o Preliminary aquifer testing of newly constructed bedrock <br />wells will be performed in this task as a standard course of constructing a well. Aquifer <br />parameters determined at the pumping well are often impacted by well inefficiencies and other <br />factors. Therefore a standard aquifer pumping test (including a pumping well and one or more <br />observation wells) is expected to be performed in subsequent phases of the SPDSS development <br />to provide more refined information on aquifer properties. <br />0 <br />Approach: <br />Task 36.1 Bedrock Well Construction and Testing <br />This Phase 1 program will including the installation, testing and monitoring of 1 well up to 400 <br />feet deep, completed in one of the Denver Basin Region bedrock aquifers. This task will <br />commence after the State provides written approval the Field Study Workplan (Task 33). <br />Locations for drilling of new wells will be located on public right-of--way and accessible for <br />the duration of the drilling and monitoring. Sites will be selected that do not require <br />significant grading for road construction or drilling. Any access fees will be paid directly by <br />the State. The State will be consulted if drilling cannot be done on public right of ways. <br />Approved site locations will be staked in the field and cleared for drilling by a commercial <br />utility locating service. <br />The Consultant will apply for monitoring well permits, and will prepare a bid package <br />consisting of well design, technical specifications, and contract documents for well drilling, <br />sampling, logging, testing, and completion. <br />Drilling and well installation will be sub-contracted to a qualified drilling contractor who is <br />licensed for this work in the State of Colorado. Well contractors submitting bids on the work <br />will be required to obtain a performance bond for the well construction work. <br />Drilling will commence when access is available and weather conditions are suitable. Drilling <br />is expected to be with mud rotary techniques. <br />This well is estimated to be a maximum of 400 feet in depth and will be completed in the <br />uppermost bedrock aquifer that is present. <br />The borehole will be near an alluvial well from Task 35, so sample collection will not <br />commence until bedrock is reached. The uppermost 25 feet of the bedrock formation will be <br />cored using a minimum 2-inch core barrel. The borehole will then be reamed and advanced to <br />the uppermost aquifer using a rotary bit, with cuttings descriptions used to define the geology. <br />When the uppermost aquifer is encountered, as identified by the onsite field geologist or <br />engineer, an additional 10 feet of core within the aquifer will be collected. <br />At the completion of drilling, a suite of geophysical logs including, at a minimum, resistivity, <br />natural gamma and SP will be run to assist in hydrostratigraphic characterization. <br />SPDSS Groundwater SOW, Phase 1 Page 15 <br />