20 Foundry Street
SANBORN HEAD Concord, NH 03301
(603) 229-1900
Building Trust. Engineering Success.
Christine J. Perron, CWS September 10, 2021
McFarland Johnson, Inc. File No. 4381.00
53 Regional Drive
Concord, NH 03301 Sent via email
Re: | Proposed Amendment #1 for Environmental and Geotechnical Engineering Services
(revised)
Preliminary Design, Final Design and Construction Documents
Bridge Street/East Hollis Street Intersection Improvements
Nashua, New Hampshire
Dear Christine:
As requested, Sanborn, Head & Associates, Inc. (Sanborn Head/Subconsultant) revised the
February 11, 2020 proposed contract amendment for environmental consulting and
geotechnical engineering services for Preliminary Design, Final Design and Construction
Documents for the Bridge Street and East Hollis Street Intersection Improvements project
in Nashua, New Hampshire. This revised amendment was updated to reflect current labor
rates and expenses as we as the pricing conditions of our current on-call agreement with
the New Hampshire Department of Transportation (NHDOT). When accepted, this
amendment will become part of the April 23, 2018 subconsultant agreement between
Sanborn Head and McFarland Johnson, Inc. (McFarland Johnson/Client) and subject to the
contract terms therein.
BACKGROUND
On behalf of the City of Nashua (Owner/End Client), McFarland Johnson prepared a
concept design for the intersection improvements (Alternate #4 - copy enclosed). We
understand that the depth of cut and fill earthwork will generally be 6 feet or less where
new utilities and traffic signal foundations are proposed, and about 3 feet or less where
new roadway is proposed in existing landscaped areas. We understand that a limited
volume of soil export (likely less than 100 cy) is anticipated as part of the project. We
assume that there will be very little change of grade where new roadways will be
constructed in existing paved areas. We further assume that most of the soil excavation and
potential export of soils will occur where new roadways are proposed in existing
landscaped areas.
Alternate #4 identifies the locations of proposed traffic signal mast arm foundations.
However, because the locations of the mast arm foundations may be subject to change, we
assume that geotechnical subsurface explorations and the geotechnical report will be
provided during the Final Design phase (not Preliminary Design). As the work progresses,
if you choose to complete the geotechnical services earlier, the scope of services and fee for
Tasks FD4 and FD5 can be moved to Preliminary Design.
SANBORN, HEAD & ASSOCIATES, INC. www.sanbornhead.com
