ITEM 604.45 - ADJUSTING TO GRADE EXISTING CASTINGS
A. SCOPE
This work consists of adjusting castings to the new final pavement surface elevation. Any repair
needed to the existing structure within the 12 inches below the bottom of casting shall be
included and performed under this item. Any further repair needed to the existing structure shall
be performed and paid under Item 604.4 Repair of Existing Structures.
B. MATERIALS AND CONSTRUCTION
This work shall include all labor, materials, equipment and transportation necessary to adjust the
existing castings to the new street or new ground surface elevation.
All materials, labor, equipment, and transportation required to excavate, to lower structure,
remove the plate and place plate at locations of castings lowered to facilitate reclaim and milling
operations shall be subsidiary to Item 604.47. The Contractor is responsible for the management
of stormwater to all structures altered/dropped for paving operations for the duration of the
project until final pavement has been placed and accepted by the City and/or the Engineer. The
Contractor shall prevent any materials from entering drain and sewer structures from this
operation and shall clean out said structures if any material enters.
Mortar shall comply with NHDOT Section 707. Brick shall be sound, hard, and uniformly
burned brick, regular and uniform in shape and size, of compact texture, and satisfactory to the
Engineer. Bricks shall comply with ASTM C32, for Grade SS, hard Brick.
Mortar shall be tooled into every vertical joint between bricks prior to installing a new horizontal
brick layer. Mortar between brick layers shall be 3/8” thick and fully cover all bricks in the layer.
Use of the weight of castings and additional brick layers to facilitate joint filling and further
spreading of mortar is not permitted. All brickwork shall be sealed on the outside and inside of
the structure with mortar. The casting frames shall be set in a ring of mortar extending to the
outer edge of the masonry. Mortar shall be placed on top of the bottom flange and smoothly
finished to have a slight slope that will shed water away from the frame.
All mortar shall be mixed with a cement mixer as approved by the Engineer. Mixing mortar by
hand/shovel will not be permitted.
Hot mix asphalt shall comply with relevant provisions of these specifications.
Raised structures greater than 2 inches shall be provided with asphalt fillets until the wearing
course is paved. The Engineer may direct the contractor to install fillets at critical casting
locations.
Unless otherwise noted herein, this work shall conform to the latest approved City of Nashua
Standard Specifications for Road Construction, City of Nashua Standard Specifications for
Sewers and Drains, and the latest approved NHDOT Standard Specifications for Road and
Bridge Construction. The most stringent specification shall apply unless otherwise directed by
the Engineer.
Page 19 of 43
