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Task 35: Construction and Testing of Alluvial Wells <br />Objective: <br />The objective of this task is to construct and test 15 wells that will provide hydrogeologic data for <br />the alluvial ground water system in the Denver Basin and the Lower South Platte Regions. <br />0 <br />Approach: <br />Task 35.1 Alluvial Well Construction and Testing in the Denver Basin and the Lower South <br />Platte Regions. <br />This Phase 1 program will include the installation, testing and monitoring of 15 wells completed <br />in unconsolidated alluvial deposits. This task will commence after the State provides written <br />approval the Field Study Workplan (Task 33). <br />Locations for drilling of new wells are expected to be located on public rights-of--way and <br />accessible for the duration of the drilling and monitoring under agreements to be negotiated <br />by CDM with assistance from the State. Any access fees will be paid directly by the State. <br />Sites will be selected that do not require significant grading for road construction or drilling. <br />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. Different contractors may be selected for <br />different areas to minimize mobilization costs. A maximum of 3 drilling sub-contracts for the <br />15 wells are estimated. <br />Drilling will commence when access is available at all sites and weather conditions are <br />suitable. <br />All alluvial wells will be constructed using hollow-stem auger equipment without use of <br />drilling fluids. <br />All boreholes will be drilled to bedrock, with an estimated maximum depth of 80 feet, and an <br />average depth of 60 feet. <br />Drill cuttings will be disposed of at the site by spreading on the site and leveling, if <br />compatible with the land-use and acceptable to the owner. If required, the cuttings will be <br />disposed of as fill at an appropriate location. Disturbed areas will be re-seeded with a dryland <br />mix, if necessary. <br />SPDSS Groundwater SOW, Phase 1 Page 12 <br />