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Section 2 <br />Field Data Collection Objectives <br />evaluated; if the data is suitable for SPDSS requirements, the existing data will be <br />used in lieu of SPDSS data collection. Five stream gage locations (Henderson, Kersey, <br />Weldona, Balzac or Atwood, and Julesburg) will be included in the study. <br />An intensive investigation of streambed properties and gain/loss has previously been <br />conducted by the U.S. Geological Survey (USGS) during which 30 cross-sections were <br />investigated on the main stem South Platte River between Denver and Ft. Lupton <br />(McMahon et al. 1995). Additionally the CWCB Flood Protection Group's detailed <br />floodplain cross-sections will be evaluated and, if suitable, used in lieu of performing <br />relevant tasks in the field program. The results of these field investigations will be <br />reviewed for data quality and benefit to the SPDSS, and pertinent results will be put <br />in a format for incorporation into HydroBase. The existence of these investigations <br />may allow CDM to investigate other parts of the study area in greater detail to meet <br />the data collection requirements of Task 34. <br />CDM will obtain necessary access agreements for sampling and testing of up to 30 <br />locations along the main stem of the South Platte River and in selected tributaries. The <br />301ocations are anticipated to represent the range of stream channel conditions <br />(width, depth, braiding, etc.) and will be distributed relatively evenly along the main <br />stem with one at Henderson and the remaining from approximately Ft. Lupton to the <br />Nebraska State line and on selected tributaries (Cherry Creek, Sand Creek, Cache la <br />Poudre River, Box Elder Creek, and Beebe Draw) as access allows. Many of these <br />locations will likely require access to private property, though public easements will <br />be used at suitable locations. Tentative locations are shown on Figure 2-1; the final <br />locations will be based on site access constraints. <br />Five transects will be located at gaging stations on the South Platte River. Four of the <br />transects will be located adjacent to the existing SEO/USGS gaging stations (at <br />Henderson, Kersey, Balzac or Atwood, and Julesburg), where shallow monitoring <br />wells were outfitted with automated water level transducers and data loggers during <br />Phase 2. A fifth transect will be located adjacent to the existing SEO/USGS gaging <br />station at Weldona. At these locations, up to four additional cores will be sampled <br />upstream and/or downstream of the transect to help define local spatial variability. <br />2.2 Task 39 Proposed Water Level Monitoring Locations <br />2.2.1 Bedrock Monitoring Well Locations <br />During Phase 2, 109 wells were measured in the post-irrigation season in 2004. These <br />wells were identified and screened by reviewing well completion information of wells <br />currently in the SEO bedrock water level collection program, with the goal of <br />obtaining a widespread distribution of measurements in each bedrock aquifer of the <br />Denver Basin. Autumn post-irrigation water levels will be collected at these same <br />locations during Phase 3, assuming that no site access issues arise. The location of <br />bedrock wells that are proposed to be measured by the SPDSS or cooperating entities <br />are provided in Figure 2-2. <br />`~ ~ <br />2-2 <br />FINAL SPDSS T33 WORK PLAN &3-OS.DOC <br />