SPDSS_Task33_2_Phase2_FieldStudyWorkPlan

Home Browse Search

South Platte Decision Support System Groundwater Component Task 33 Field Study Work Plan for Alluvial and Bedrock Well Installation, Testing, and Water Level Monitoring adequately characterize the groundwater system at key locations in the SPDSS study area. 2.1 Task 35, Proposed Denver Basin Region Alluvial Aquifer Monitoring Well Locations Figures 2 and 3 show the six areas of interest within the alluvial aquifers that have been targeted for additional investigation during Phase 2. These areas include Henderson, Beebe Draw, Kersey, Weldona, and Big Sandy Creek. Figures 4 through 9 present a summary of existing aquifer property and water level data locations in the alluvial deposits in the Denver Basin Region along with the proposed Phase 2 well locations. Table 2 summarizes the proposed Phase 2 investigations for each of the areas. These locations focus on defining groundwater underflow and the interaction with surface water at major tributaries and at strategic locations on the main stem of the South Platte River, such as at existing stream gages, and at tributaries that contribute significant flow to the aquifer within the mainstem of the South Platte River based on existing information. A total of 20 new wells are proposed for the Denver Basin Region, as shown in Table 2. Table 2 also includes the number of existing wells and aquifer test data points that will be used at each site to meet the data collection objectives. In addition to the installation of new wells in the interest areas, existing wells in these areas will be evaluated to supplement the SPDSS monitoring network for spring and fall water level monitoring. These wells were installed and/or currently monitored by the U.S. Geological Survey (USGS), Central Colorado Water Conservation District (CCWCD), Colorado State University, and other entities. It is anticipated that up to six additional existing wells will be added to the SPDSS monitoring network, at each of the Henderson and Weldona interest areas, and that up to three wells will be added at each of the Beebe Draw, Kersey, and Big Sandy Creek interest areas. The target number of wells to be installed and monitored in each of the areas mentioned below is subject to change if mutually agreed upon by the State and CDM, depending on the availability of existing monitoring wells, site access, and the receipt of additional data that would fill existing data gaps and make well installation unnecessary. Specific locations will be identified to the State prior to initiating fieldwork. ~. ~.1 l Z:\SPDSS\10-CDM DELIVERABLES\PHASE 2 FIELD WORKPLAN\FINAL DRAFT\FINAL SPDSS TASK 33 2 WORK PLAN.DOC