Explanation
1. BACKGROUND: This legislation authorizes the Director of Public Utilities to enter into an engineering agreement with Brown and Caldwell for Professional Engineering Services (Design Professional, or “DP” services) for the SWWTP Digestion Process Expansion project. Brown and Caldwell will provide Preliminary Design Services (Step 1), Detailed Design and Bidding Services (Step 2), and Services During Construction (Step 3).
The initial phase of this contract will provide Professional Engineering Services for Preliminary Design (Step 1) and Professional Engineering Services for Detailed Design and Bidding Services (Step 2). A future modification is anticipated as the third phase of Professional Engineering Services for Engineering Services During Construction (Step 3).
The scope of work for this project generally includes reconfiguring Methane Phase Digester 6 (MPD 6), reconfiguring and repurposing Acid Phase Digesters (APD) 1, 2, and 3, and building a new seventh methane phase digester (MPD 7). This project will effectively discontinue SWWTP’s acid phase digestion process and will repurpose APDs 2 and 3 as thickened primary sludge (TPS) storage tanks and repurpose APD 1 as a predigestion TPS/Thickened Waste Activated Sludge (TWAS) blending tank. This project will also provide a comprehensive analysis of identified alternative treatment technologies and digestion process configurations for producing Class B biosolids.
Step 1 of this project, Preliminary Design, will include the followings tasks: 1. Conduct a site investigation that includes discipline specific visual observations of the existing facility. 2. Review existing data and reports to verify the design and operational deficiencies of the current two-phase anaerobic digestion system. 3. Review and revise the SWWTP Digester System Shut-Down SOP. 4. Review the current digester cover access walkway design. 5. Review solids loading assumptions from the Chemically Enhanced Primary Treatme...
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