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<br />I <br /> <br />1.3 <br /> <br />TASK 2 - PRELIMINARY ENGINEERING REPORT <br /> <br />The Engineer will: <br /> <br />1.3.1 Pipeline Design Criteria Technical Memorandum - Prepare a pipeline design criteria <br />technical memorandum ("TM") to include: <br /> <br />a) A review of the previous hydraulic analyses in order to establish pipeline <br />hydraulics for design. As a first step in this analysis, the Engineer will <br />establish design flow requirements for the system. Design flow demands will be <br />consistent with the City of San Marcos Wastewater Master Plan; <br /> <br />b) Pipeline easement widths (permanent and construction) and range of locations of <br />pipe in the easement; <br /> <br />c) Pipeline horizontal and vertical alignment criteria; <br /> <br />d) Pipe materials; <br /> <br />e) Pipe Pressure Design: The Engineer will establish criteria for structural design, <br />including internal and external loading, plus other pertinent factors; <br /> <br />I <br /> <br />f) <br /> <br />Earthwork: Pipe bedding, zone, and backfill requirements; minimum depths; <br />disposal of excess trench materials; finished grading, drainage, and re-vegetation <br />requirements; <br /> <br />g) Location, spacing, and sizing criteria for pipeline appurtenances; <br /> <br />h) Creek crossing requirements and details (open cut and tunneled options will be <br />discussed); <br /> <br />i) Requirements for tunnels, casings, concrete encasements, and utility crossing <br />support; and <br /> <br />j) Construction access roads and staging areas requirements. <br /> <br />1.3.2 Lift Station No. 14 Design Criteria Technical Memorandum - Prepare design criteria TM <br />for Lift Station No. 14 to include: <br /> <br />a) Hydraulic Analysis. Refine and update the system hydraulic analysis for initial, <br />intermediate, and ultimate development, develop system curves and select <br />appropriate pump curves, define pump operating points and ranges (flows and <br />heads) and determine horsepower requirements. In addition, the Engineer will <br />coordinate this effort with the pipeline hydraulic analysis; <br /> <br />I <br /> <br />Davis Lane Wastewater Improvements Project - CH2M Hill <br /> <br />3 <br />