Agmt 2008 Carollo Engineers Inc - Laserfiche WebLink

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• Alternative 1 -Rehabilitate the existing PSBs structurally and mechanically while considering the addition of lamella plates to improve removal efficiencies. • Alternative 2 -Replace the existing PSBs with a new 70-foot-diameter circular primary clarifier. • Alternative 3 -Replace the existing PSBs with ahigh-rate clarification process like Actiflo to handle peak wet weather flows. • Alternative 4 -Abandon the existing PSBs and provide chemically enhanced primary treatment (CEPT) for the two existing primary clarifiers. The alternatives will be evaluated and compared based on site layout requirements, process performance and reliability, operation and maintenance considerations, materials of construction, constructability, chemical requirements, and cost. Information and/or Services Provided by City: • Available record drawings and specifications of past WPCP designs. • Input on operation and maintenance requirements of existing primary sedimentation and clarification processes. • Input on configuration of predesign alternatives. Consultant Deliverables: • Figures showing site layout options. • Summary table of alternatives comparison. • Summary table of cost of alternatives. • Draft TM (5 hard copies). Task 1.9 -Secondary Treatment Process Evaluation. Consultant shall prepare a TM to evaluate the secondary treatment process improvements, Alternatives to be evaluated include: • Alternative 1 -Rehabilitate the existing fixed film reactor (FFR) and provide a second FFR. • Alternative 2 -Rehabilitate the existing FFR and provide new aeration tank(s) that will incorporate a mixed-use process that can enable the new aeration tank(s) to operate as either conventional aeration tanks, contact stabilization tanks, or daily diurnal flow equalization tanks. Consulting Services Agreement between Project No. 08-593-52-239 City of San Leandro and Carollo Engineers, Inc. Page 21