Te:
From
Re:
C, Motion:
Attachments:
Discussion:
City of Nashua, Public Works Division
Board of Public Works Meeting Date: August 22, 2019
Stephen Dockran, P.E., City Engineer
Engineering Department
Consent Decree
2019 Updated Long Term Control Plan
To approve the engineering consultant contract to Hazen of Manchester, NH tc
update the CSO ieng term control plan in an amount not to exceed $487,760.
Funding for this contract will be through Department: 169 Wastewater; Fund:
Wastewater; Activity: Consent Decree Operational.
Hazen Scope of Work and Fee
The City completed multiple projects from 1998 through 2015 to reduce the
frequency and volume of Combined Sewer Overflows (CSOs) discharging io the
Merrimack and Nashua Rivers so water quality can be improved as required by
the 1972 Clean Water Act. The CSO program was based first on a 1997 Long-
Term CSO Control Plan and then a 2003 Long-Term Water Quality and
Infrastructure Control Plan submitted to EPA and NHDES and various other
studies to investigate practicable and cost-effective measures to control CSOs.
All mandated CSO control projects have been implemented on schedule.
After review of completed CSO program, the EPA has concluded that further
CSO reduction is necessary. They have requested that the long-term control plan
be updated and projects identified to reduce or eliminate CSO’s under a “Phase 2”
~oO program. In addition, currently the City is also is subject to the 2017 New
Hamoshire Small MS4 General Permit that allows stormwater drain pipes to
discharge to local waterways. The EPA allows municipalities like Nashua with
multiple permits to use an integrated planning approach to prioritize and schedule
wastewater and stormwater projects based on the financial capability. This study
will develop recommend projects to comply with the EPA’s CSO Policy
requirement for LTCP development, and development of an Integrated Plan
consistent with EPA guidance and CWA requirements, meeting the goal of
improved water quality that is affordable and practical.
Hazen is currently working on the Capacity, Management, Operation and
Maintenance (CMOM) program tor both the sewer and storm drainage systems
Hazen has worked with the Engineering and Wastewater Departments on multiple
rojects related to the wastewater coilection system, the treatment plant and CSO
program, achieving satisfactory results. Hazen also manages the hydraulic model
INFO Works for the department. With their knowledge of the voth the
wastewater and stormwater systems, this study can be completed efficiently and
effectively. A significant part of the cost is the metering of the collection system.
This is required as part of this work due to the expansive changes in the
