3. Assess operating costs for drying facility. Evaluate cost-benefit of utilizing hot water from existing
CH&P generators and/or biogas to drive the drying process versus use of natural gas. Assess hot
water needs and impact on operation of 1 versus 2 CH&P generators.
4. Develop site layout plan to determine impact on facilities adjacent to the Sludge Processing
Building at the Nashua WWTF. In particular, assess impacts on facilities to north of Sludge
Processing Building including maintaining access to existing primary sedimentation tanks and scum
well and Maintenance Facility. Assess space requirement for potential future processing options
like subsequent pyrolysis of the dried biosolids.
5. Assess space requirements for a new Maintenance Facility if this proves necessary. Develop
concept plan including site layout plan for new Maintenance Facility as well as the planned Vehicle
Garage. Assess cost impact of relocating Maintenance Facility.
6. Identify required scope elements for building system improvements (architectural, structural,
mechanical, instrumentation and controls, and electrical) and document in discipline-specific
technical memoranda. Develop preliminary cost estimates for each discipline.
G. Prepare Draft Preliminary Design Report and Drawings
1. Prepare draft Preliminary Design Report (PDR) package that includes all technical memoranda, final
design criteria, preliminary drawings and an outline of technical specifications.
i. Prepare a permitting plan for the proposed drying facility including any federal, state, and
local requirements.
ii. Identify the sequence of construction for the facility, assess the necessary construction
duration, and develop an overall project schedule.
iii. Submit a full construction cost estimate for the recommended plan.
2. Submit a draft of the PDR documents to the City for review and comment. Meet with the City to
review comments. The draft preliminary design package will be completed within 180 days of
receiving authorization to proceed.
H. Prepare Final Preliminary Design Report
1. Review City and NHDES comments and provide a memorandum with written responses to all
comments to the satisfaction of the City, including updating drawings, cost estimate and report
sections as necessary.
2. Submit the final PDR package to NHDES for review and comment.
WriGHT-PIERCE = 3 of 3
Engineering a Better Environment
