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Task 300 — Pre -Design <br />Objective <br />HDR will develop a conceptual layout for the preferred option, including modifications to DS -0. <br />For scoping purposes, a pipeline, at 96 -inches, was used. If the pump station alternative, or <br />other alternative beyond the 3 base alternates, is selected, a revision to the scope will be <br />necessary. <br />HDR Services <br />1. Develop a location, preliminary layout and design configuration for the new/expanded <br />DS -0 facility. <br />2. Establish a pipeline route and size. <br />3. Develop a pipeline discharge structure/protection plan. <br />4. Participate and lead a Design Workshop with the City. <br />a) One workshop will be conducted with City staff to evaluate design approach, <br />standards, and coordinate operation and maintenance. The workshop will be used <br />as a means to gain design input and make team decisions on the following: <br />i. Facility layout, preferred pipe materials, safety features, piping layout and <br />valving, equipment, and control strategy. <br />ii. Discuss the discharge location and mixing within the lagoon. <br />5. Pre -Design Report: <br />a) Summarize the design workshop, sizing, equipment, layout, and operations of the <br />proposed DS -0 facility. <br />b) Include the modeling TM as an appendix, summarize the sizing in the pre -design <br />report. <br />c) Include a draft process flow diagram (PFD) of the new DS -0 system. PFD will <br />include a draft schematic design of the process and mechanical features only. PFD <br />will not include SCADA interface. <br />d) Include draft structural review of the DS -0 facility. Based on the selected <br />configuration and locations of the proposed facilities, structural engineering design <br />criteria will be developed to guide the preliminary design of the new DS -0 facility. The <br />Structural Design Criteria will identify and define materials to be used, applicable <br />loading and load combinations, deflection and operations criteria. The criteria will be <br />outlined in the pre -design report and include the following: <br />L Structural design Codes, Standards, and References <br />ii. Materials <br />iii. Structural Modeling <br />iv. Structural support system <br />v, Loads <br />vi. Soil properties and design parameters such as: <br />1) Unit weight <br />2) Vertical Modulus of Subgrade Reactions <br />3) Coefficient of FC[ction between Concrete and Soil <br />^) Ailowable Bearing Capacity <br />Citv el vereii—`d't Diversion SfruCiure 0 ,}�� vccpe of Services <br />