SANBORN ull HEAD 20 Foundry Street
. Building Trust. Engineering Success. Concord, NH 03301
EXHIBIT B
Mr. Jeff Lafleur February 4, 2021
Superintendent
Nashua Division of Public Works, Solid Waste Department Sent via email
840 West Hollis Street
Nashua, NH 03062
Re: Scope of Engineering Support Services
Block Wall Corrective Action CQA Services
Four Hills Landfill
Nashua, New Hampshire
Dear Jeff:
Sanborn, Head & Associates, Inc. (Sanborn Head) appreciates the opportunity to provide this
scope of services to the City of Nashua (City) relative to construction quality assurance (CQA)
support services for the gas collection and control system (GCCS} modifications at the Four
Hills Landfill to address surface emissions along the existing concrete block setback walls.
The scope of services presented herein is based on communication with the City regarding
the services needed to support this effort.
SCOPE OF SERVICES
Task 1 - Construction Phase Services
Under this task, Sanborn Head will perform construction-phase engineering services in
support of the installation of the GCCS components depicted on the construction drawings
and technical specifications approved by NHDES. This effort will include:
= Preparing for and attending a pre-construction meeting at the Four Hills Landfill to
review the project and proposed construction timeline with the selected contractor. We
assume that the City will prepare the agenda and meeting minutes for this meeting.
m Reviewing contractor submittals for conformance with the specifications for the project.
s Providing proposed pipe alignments to the Contractor for stake-out in the field by the
Contractor's surveyor.
« Updating the well schedule for the project based on ground surface elevations recorded
by the Contractor’s surveyor at the time of construction.
« Performing construction observation services to document the installation of critical
GCCS components for conformance with the drawings and technical specifications
approved by the NHDES. We assume between two and four site visits per week,
depending on the nature of the work being performed at the time, and a 5-week overall
duration for the project. While on site, Sanborn Head’s representative will meet with
representatives of the City and the contractor, observe construction (including material
testing performed by the contractor), take photographs, and document the observations.
SANBORN, HEAD & ASSOCIATES, INC. wwiwesanbornhead com
