To:
From:
Re:
A. Motion:
Attachments:
Discussion:
City of Nashua, Public Works Division
Board of Public Works Meeting Date: September 26, 2019
Jeff Lafleur, Superintendent
Solid Waste Department
2019 Landfill Gas Collection and Control System Expansion Change Order
To approve a change order to the contract with SCS Field Services of Reston, VA
in the amount of $135,140 pending bond approval. Funding will be through
Department 168 Solid Waste; Fund: Bond; Activity: Landfill Gas Expansion FY20.
Schedule of Values
The City issued a contract to SCS Field Services to construct an expansion of the
landfill gas collection system in the Phase I/II landfill. After receiving bids to build
the expansion, which includes new horizontal and vertical gas wells, one of the
main vacuum headers in the landfill began showing signs of failure (e.g. loss of
vacuum to several gas collectors). This change order is for the replacement of the
vacuum header. The Solid Waste Department’s engineering firm, Sanborn Head
and Associates, Inc. (SHA) prepared a construction design for the replacement
header. This work is required to control odors, mitigate fugitive methane surface
emissions and comply with the NHDES approved Operating Plan — Phase II
Secure Landfill Expansion and the Landfill Gas Collection System Enhanced
Monitoring Protocol/Standard Operating Procedures (EMP/SOP).
