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Task 1.7 - Headworks and Influent Pump Station Evaluation. Consultant shall prepare a TM to evaluate <br />headworks and influent pump station improvements, Alternatives to be evaluated include: <br />• Alternative 1 - Provide a new headworks with three Auger Monster screening systems and two <br />vortex grit tanks antl rehabilitate the existing influent pump station. <br />• Alternative 2 - Provide a new headworks with three screens (climber or fine screens) and one <br />vortex grit tank and rehabilitate the existing influent pump station. <br />• Alternative 3 - Provide a new headworks with three screens (climber or fine screens), a new <br />influent pump station, and a vortex grit tank. The grit tank will be located before or after the influent <br />pump station. <br />For each alternative, screenings and grit conveyance, screenings washing/compacting, grit <br />washing/cycloning, and grease/scum handling will also be evaluated. The alternatives will be evaluated and <br />compared based on site layout requirements, process performance and reliability, operation antl <br />maintenance considerations, materials of construction, constructability, odor impacts, and cost. <br />Information and/or Services Provided by City: <br />• Available record drawings and specifications of past WPCP designs. <br />• Input on operation and maintenance requirements of existing headworks and influent pump station. <br />• Input on configuration of predesign alternatives, <br />Consultant Deliverables: <br />• Figures showing site layout options. <br />• Summary table of alternatives comparison. <br />• Summary table of cost of alternatives. <br />• Draft TM (5 hard copies). <br />Task 1.8 -Primary Sedimentation Basin Evaluation. Consultant shall prepare a TM to evaluate primary <br />sedimentation basin (PSB) improvements. Alternatives to be evaluated include: <br />• Alternative 1 -Rehabilitate the existing PSBs structurally and mechanically while considering the <br />addition of lamella plates to improve removal efficiencies. <br />• Alternative 2 -Replace the existing PSBs with a new 70-foot-diameter circular primary clarifier: <br />Consulting Services Agreement between Project No. 08-593-52-239 <br />City of San Leandro and Carollo Engineers, Inc. Page 20 <br />