To:
From:
Re:
C. Motion:
Discussion:
City of Nashua, Public Works Division
Board of Public Works Meeting Date: August 26, 2021
Daniel Hudson, P.E., City Engineer
Engineering Department
CMOM Plan Implementation — Phase I]
To approve the engineering consultant contract with Hazen and Sawyer of
Manchester, NH for the CMOM Implementation Phase I] in an amount not to
exceed $2,600,000. Funding for this contract will be through Department 169
Wastewater; Fund: SRF Loan; Activity: CMOM Phase II. (Pending approval)
As part of the City’s wastewater discharge permit, the EPA required a Capacity,
Management, Operation and Maintenance (CMOM) plan be developed to outline
an approach to find a practicable and affordable strategy to clean, repair and
maintain the wastewater and drainage collection systems so they can provide a
maximum level of service. A CMOM plan was completed by consultant
CDM/Smith in April 2018 to develop a process for inspecting and assessing the
over 497 miles of pipe comprising the wastewater and stormwater collection
systems. In October 2018, consultant Hazen and Sawyer was contracted to
implement the plan in two phases. During Phase I which was completed in February
2021, over 121,000 linear feet of the oldest and largest wastewater sewers and over
24,000 linear feet of storm drains and culverts were cleaned and inspected using
closed circuit television (CCTV). The condition of the pipes was rated and
recommendations for rehabilitation were made. In addition, Hazen updated the
City’s GIS collection system mapping with the findings, drafted standard operating
procedures and an Operation and Maintenance Manual for the collection system
infrastructure.
Phase II of the implementation will continue the CCTV inspection of the older and
largest pipes in the collection systems. Pipes located in difficult to reach locations
will also be investigated as well as associated infrastructure such as manholes,
headwails, and force mains. In anticipation of the necessary work, the City has
requested to enter into a $2.6 million State Revolving Fund (SRF) loan agreement
for the CMOM Implementation Phase II work, which is going through the NHDES
approval process. This contract will be awarded pending the acceptance of the loan
by the City.
