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South Platte Decision Support System Groundwater Component Task 33 Field Study Work Plan <br />for Alluvial and Bedrock Well Installation, Testing, and Water Level Monitoring <br />well aquifer testing. The Phase 2 field program is focused mainly on collection of <br />water level data to facilitate better understanding of the water table surface, and thus <br />the groundwater underflow, at key locations along the South Platte main stem and <br />significant tributaries. This will in turn assist quantification of the groundwater flux at <br />points designated to serve as internal calibration points in planned groundwater <br />modeling efforts. <br />Field activities recommended in SPDSS technical memoranda (TMs) and developed in <br />Phase 2 SPDSS scoping activities include the following: <br />^ Installation of additional groundwater level monitoring wells along the main stem <br />of the South Platte River <br />^ Installation of groundwater level monitoring wells where high-discharge <br />tributaries contribute groundwater to the main stem of the South Platte River <br />^ Increase the number of wells to be measured in the fall from the 60 currently <br />proposed to a greater number of wells for all aquifers <br />^ Installation of shallow wells at key locations, and paired with stream gages along <br />the South Platte main stem, to quantify flow passing these points <br />^ Perform single- and, where possible, multi-well aquifer pumping tests in the <br />Denver Basin bedrock aquifers <br />^ Perform aquifer tests in the South Platte alluvium in data-gap areas to supplement <br />existing aquifer property data <br />^ Collect bedrock groundwater level data at strategic locations in the Denver Basin, <br />especially near regions where the system is experiencing significant regional stress <br />to help quantify the extent of the regional cone of depression and seasonal recovery <br />of the bedrock aquifers during the year <br />Recent scoping activities and recommendations in the SPDSS TMs have led to <br />modifications to the field program that was outlined in the previously approved SOW <br />(CDM 2003b). The main differences relevant to the Phase 2 field program are (1) a <br />shift in emphasis primarily from collection of aquifer property data to water level <br />monitoring in the alluvial aquifer system connected to the South Platte River and its <br />tributaries, (2) collection of aquifer property data in the Denver Basin Region bedrock <br />aquifers by conducting aquifer pumping tests, and (3) expansion of the fall and spring <br />water level measurement program. The Phase 2 field data collection program includes <br />a greater emphasis on quantifying total flow in the groundwater system at a series of <br />strategic locations that can be used to assist in better calibration of the planned <br />groundwater flow model for the alluvial aquifer. Examination of available data at <br />these locations shows that estimates of aquifer properties and aquifer configuration <br />are available, but there is a shortage of available water level data needed to <br />3 <br />Z:\SPDSS\10-CDM DELIVERABLES\PHASE 2 FIELD WORKPLAN\FINAL DRAFT\FINAL SPDSS TASK 33 2 WORK PLAN.DOC <br />