SPDSS_Task33_2_Phase2_FieldStudyWorkPlan

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South Platte Decision Support System Groundwater Component Task 33 Field Study Work Plan for Alluvial and Bedrock Well Installation, Testing, and Water Level Monitoring ^ Section 2 summarizes locations of existing data gaps and describes the data collection priorities for the proposed field program ^ Section 3 describes new field activities that will be performed under Phase 2 and describes any differences between Phase 1 and Phase 2 drilling, sampling, well installation, testing, and groundwater level monitoring ^ Section 4 describes the reports that will be prepared following completion of the field program ^ Section 5 presents an engineering estimate of subcontractor costs associated with execution of the field program ^ Section 6 contains a list of references cited in this Field Study Work Plan Addendum 1.2 Overview of Phase 2 Field Data Collection Program This work plan will guide the Phase 2 Field Data Collection Program (Field Program) for the groundwater component of the SPDSS under Tasks 35, 36, 37, and 39. The objectives of each task are presented below in Table 1. Table 1 Phase 2 Field Data Collection Tasks and Ob'ectives Task Objective Applicable Region Task 35 Construct up to 27 alluvial observation wells to provide Denver Basin, Lower h dro eolo is data South Platte Task 36 Construct and test one bedrock well that will provide Denver Basin h dro eolo is data Task 37 Collect aquifer property data from bedrock aquifers by Denver Basin performing aquifer tests at existing high-capacity wells Task 39 Collect water level data in the fall after the irrigation season Denver Basin, Lower South Platte 2.0 Field Data Collection Objectives Phase 1 of the SPDSS compiled available information on aquifer configuration, hydraulic properties, and water levels. This work also included installation of wells and a testing program to supplement existing data sources. Analysis of this information was summarized in a series of technical reports that included definition of areas where limited data are available. The field investigations summarized in this work plan are intended to provide additional information to fill in some of these data gaps. These areas have been prioritized to select locations that will best meet the objectives of the SPDSS. The field programs include installation and testing of alluvial and bedrock wells, and monitoring ofpost-irrigation season water levels. The data gap areas, also referred to as interest areas, identified in Phase 1 activities were primarily established in locations where aquifer property data were lacking. In these areas, the SPDSS Phase 1 field program installed small-diameter observation wells near high-capacity production wells to gather aquifer property data via mulh- ~.~.-~ Z:\SPDSS\10-CDM DELIVERABLES\PHASE 2 FIELD WORKPLAN\FINAL DRAFT\FINAL SPDSS TASK 33 2 WORK PLAN.DOC