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Task 2 — Design Extraction Well System <br />• <br />• Purpose: Develop an adaptable and expandable design for an extraction well systcn. <br />to maximize capture of groundwater flowing through the alluvial aquifer. <br />• Scope: URS will analyze the data obtained during Task 1 and develop site - specific <br />designs for each proposed extraction well site. The wells will likely all be the same• <br />diameter and constructed of similar materials as used previously for the feasibility <br />study extraction well. However, extraction well depth and screened interval will van <br />based on the alluvial aquifer thickness at each selected extraction well site. Both the <br />subsurface as well as the aboveground components of the wells will be designed <br />including well discharge structures. <br />The extraction well system will be designed such that water sampling can be• <br />conducted at each well site as well as at the point of discharge to the north seep wate <br />collection canal. To provide freeze protection, the wells will be designed to discharge• <br />to the transmission pipeline at approximately 5 feet below ground surface using <br />pitless adapters. <br />• Deliverable: The deliverable will consist of design drawings of the wells, includini <br />section and plan views as well as appropriate design details. These drawings will be <br />presented in the Design Report (Task 5). <br />Task 3 — Design Transmission Pipeline <br />• Purpose: To design a transmission pipeline capable of collecting the discharge from <br />each proposed extraction well and conveying it to the selected discharge location. <br />• Scope: Design the transmission pipeline, header system, and outflow structure(s) to <br />the north seep water collection canal. The pipeline design will incorporate pigging <br />stations and ancillary equipment at appropriate intervals to enable cleaning and de <br />scaling of the pipeline. To provide freeze protection, the pipeline will be buried to <br />approximately 5 feet below ground surface and the wells will be designed to <br />discharge to the pipeline at this depth. The outflow structure design will include both <br />an in -line totalizer flowmeter as well as a weir -type gaging station to provide! <br />redundancy for flow measurement. <br />• Deliverable: The deliverable will consist of design drawings of the pipeline, pigging <br />stations, well discharge connections (underground connections to the pitless <br />