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Section 2 <br />Field Data Collection Objectives <br />Phase 1 and 2 of the SPDSS compiled available information on aquifer configuration, <br />aquifer hydraulic properties, and aquifer water levels. This work also included <br />installation of wells and a testing program to supplement existing aquifer data <br />sources. Field investigations summarized in this work plan are intended to provide <br />additional information to the SPDSS and will include streambed conductance testing <br />and monitoring of post-irrigation season water levels. <br />Field Activities recommended in SPDSS technical memoranda (TM) and developed in <br />Phase 3 SPDSS scoping activities include the following: <br />^ Identify locations for streambed conductance field investigations and obtain <br />necessary access agreements for sampling and testing of up to 301ocations along <br />the main stem of the South Platte River and in selected tributaries. <br />^ Collect up to six streambed sediment samples for grain size distribution analysis at <br />each of the selected testing locations (transects). <br />^ Install a temporary piezometer and test the streambed hydraulic conductivity at <br />one selected stream sediment coring location from each transect to develop an <br />empirical relationship between the streambed hydraulic conductivity and the <br />sediment grain-size distribution. <br />^ Determine the vertical hydraulic gradient across the streambed sediments at each <br />transect using temporary piezometers. <br />^ Determine the streambed geometry at each transect by surveying the channel cross- <br />sections or by using existing data supplied by CWCB. <br />^ Collect water level measurements during the fall of 2005 and spring of 2006 from <br />existing monitoring wells. <br />2.1 Task 34 Proposed streambed Conductance Testing <br />Locations <br />The objective of the Phase 3 streambed conductance testing program is to quantify the <br />groundwater flux across the streambed in the South Platte River and the mouths of <br />significant tributaries. To accomplish this objective, a generally even geographic <br />distribution of test sites will be studied. Figure 2-1 shows general locations of the 30 <br />transects within the study area that have been targeted for investigation during Phase <br />3. Exact locations will depend on site access availability to be determined in Task 34 <br />prior to field work. Locations presented in Figure 2-1 are approximate and may be <br />changed should the study area be expanded by the State. It is anticipated that at <br />several locations bridge crossings will be used. Data from previous studies will be <br />`~ ~ <br />2-1 <br />FINAL SPDSS T33 WORK PLAN &3-OS.DOC <br />