Current through Register No. 40, October 3, 2024
(a) Design of a
municipally-managed project may be performed by municipal staff, or by a
consultant, provided the designer is a licensed professional engineer
registered in the applicable branch classification, including, but not limited
to, requiring a structural engineer for bridge design.
(b) The department shall notify the
municipality in writing if it determines that a proposed project is:
(1) Simple in its scope, including, but not
limited to, the resurfacing of a road or the replacement of a culvert, a
municipality shall not be required to provide to the department an engineering
study, preliminary plans, and final plans for the proposed project;
or
(2) More complex than the type
of project described in (1) above, including, but not limited to the
reconstruction of a road, the widening of a road, the rebuilding of an
intersection, or the addition of turning lanes, a municipality shall provide an
engineering study, preliminary plans, and final plans for the proposed project
to the department for review.
(c) The engineering study shall contain the
following elements:
(1) A description of
existing conditions, including:
a. Description
of the existing bridge and roadway;
b. Length and width of existing
structures;
c. Type of bridge
superstructure and substructure;
d.
Alignment of the approach roadway; and
e. Any significant geometric or topographical
conditions;
(2) A list
of the relevant design criteria and manuals to be used, including, but not
limited to:
a. Bridge loading; and
b. Design speed;
(3) A description of the methodology and
reasoning used to develop the proposed roadway alignment, including:
a. Horizontal and vertical curves;
b. Travel way and shoulder widths;
c. Effects upon environmentally sensitive
areas, such as wetlands;
d. Effects
upon utilities;
e. Effects upon any
existing structures; and
f. Effects
upon private property;
(4) A description of the methodology and
reasoning used to develop the proposed bridge type, including:
a. A narrative comparison of the bridge types
studied;
b. A plan of the
recommended bridge type, in plan, elevation and typical section, portraying:
1. Components of the
superstructure;
2. Components of
the substructure;
3. Materials to
be used in construction;
4. Beam
spacing; and
5. Dimensions of
pavement and curbs;
(5) The number and content of any boring logs
taken, if deemed necessary by the responsible professional engineer, to present
a reasonably accurate picture of subsurface conditions at the site;
(6) A description of the methodology and
reasoning used to present the hydrologic and hydraulic parameters present at
the site, including:
a. Drainage
area;
b. Design flood event and
volume;
c. Flood velocity;
and
d. Elevations of drainage
area;
(7) An itemized
cost estimate for the proposed bridge type and roadway alignment, consistent
with the standard specifications, item names, and definitions published in the
New Hampshire Department of Transportation Standard Specifications for Road and
Bridge Construction (2006);
(8) A
description of the environmental resources that may be affected by each of the
alternatives considered, including:
a.
Natural resources protected by state or federal environmental protection laws;
and
b. Cultural, historical,
social, and economic resources protected by state or federal laws;
(9) A description of meeting(s)
held with the New Hampshire division of historical resources in order to
identify potential historical or archeological concerns that should be
investigated to determine the possible impact of the project on cultural
resources; and
(10) A description
of how traffic control and constructability issues will be addressed during
construction.
(d) The
preliminary plans shall contain the following elements:
(1) A location plan, on a minimum scale of
one inch equals one mile;
(2) A
general plan, depicting the elevation of the bridge structure;
(3) A cross section of the approach roadway
adjacent to the bridge;
(4) A cross
section of any roadway, water course, or other area spanned by the
bridge;
(5) A cross section of the
bridge structure;
(6) General
notes, depicting:
a. Design
loading;
b. Foundation
type;
c. Allowable foundation
loads;
d. Minimum frost
cover;
e. Superstructure
type;
f. Seismic design
calculations; and
g. Any other
condition that, in the opinion of the presenting engineer, is worthy of note to
the reviewing engineer;
(7) Hydrologic and hydraulic data, including
drainage area and design taking into account flood volume, velocity, and
elevation;
(8) Existing and
proposed roadway layout plan;
(9)
Profiles of all roadways affected by the project;
(10) Critical Cross section;
(11) Boring logs and locations, if
available;
(12) A comparison of
existing and proposed channel contours, including proposed channel and slope
protection; and
(13) Engineer's
estimate of cost of construction for the complete proposed project.
(e) The department shall review
the engineering study and preliminary plans. Following receipt of the
department's comments on the engineering study and preliminary plans, the
municipality shall submit final design plans and an updated cost estimate to
the department for review and approval. After approval of the final design
plans and cost estimate by the department, the municipality shall prepare
contract plans, specifications, and a contract proposal.
(f) Contract plans, specifications, and
proposals shall bear the licensed professional engineer stamp of the
professional engineer who prepared the plans and contract proposal, or under
whose direct supervisory authority the plans and contract proposal were
prepared. Before finalized plans and contract proposals are submitted, it shall
be independently checked in detail by a structural and highway designer, other
than the original designer, and reviewed by the consultant's supervising
engineer charged with responsibility for the project.
#8923, eff 6-27-07
