ITEM 604.47 - DROP AND PLATE CASTING
A. SCOPE
This work consists of removing existing casting, removing brick and mortar supporting the
casting, plating the hole over the structure, and backfilling the hole. Excavation, plate removal,
and final adjustment to proposed grade will be covered under Items 604.4, Item 604.45, and Item
604.46 as determined by the Engineer.
B. MATERIALS AND CONSTRUCTION
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.
Removed castings shall not be stored on private property. They shall be stored in the City ROW
without impeding vehicular, bicycle, and pedestrian traffic. All casting shall be removed within a
timely manner.
ITEM 604.46 —- REPLACE CASTING
A. SCOPE
This work consists of replacing triangular, recessed, small diameter, and broken manhole frames
and covers, and catch basin frames and grates as shown on the drawings or as directed by the
Engineer. Any repair needed to the existing structure within the 12 inches below the bottom of
the casting shall be included and performed under this item. Any further repair needed to the
existing structure shall be performed under Item 604.4.
B. MATERIALS AND CONSTRUCTION
C. MEASUREMENT AND PAYMENT
Payment for Adjusting to Grade Existing Castings shall be at the contract unit price specified for
each. This payment shall include all materials, labor, equipment, and all else needed to complete
the work under this item.
Contractor shall record the number and location of castings adjusted for each street. Payment is
contingent upon submittal of quantities in a per structure, and per street format.
Page 20 of 43
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
Contractor shall record the vertical feet of repair completed for each structure as identified by
Nashua’s GIS naming system, and the total vertical feet of repair for each street. Payment is
contingent upon submittal of quantities in a per structure, and per street format.
Page 18 of 43
ITEM 604.4 - REPAIR OF EXISTING STRUCTURES
A. SCOPE
This work consists of repairing existing structures below 12” from the bottom of existing casting
frame.
B. MATERIALS AND CONSTRUCTION
The contractor shall include all labor, materials, equipment, and transportation necessary to
repair existing structures other than within the top 12 inches below the bottom of casting frame.
Repairs in that section shall not be paid under this item.
Technical Specifications — 2021 Paving Program Arterial and Collector Roadways
Leaching Catch Basin Detail
SINGLE GRATE - 24° x 24° OPENING
DOUBLE GRATE - 24" « 40" OPENING
TOP SLAB [H-20 LOADING)
SS
12"
THIN
PSS re FILTER FABRIC
L SSS (IRAP 1406 OF
APPROVED EQUAL)
CRUSHED STONE (COURSE)
NHOOT ITEM 04.6
PERFORATION (TYP)
10% BOTH WAYS
a:
'. (PERPORATED °
4 “
md
—
PERFORATION
NOT TO SCALE
oo
TW]
ITEM 604.124 —- CATCH BASIN
A. SCOPE
This work includes furnishing and installing a catch basin at locations shown on the plans or as
directed by the Engineer.
B. MATERIALS AND CONSTRUCTION
The contractor shall furnish all materials, labor, equipment, and transportation necessary to
complete the work in accordance with the latest approved City of Nashua Standard
Specifications for Road Construction, or the latest approved NHDOT Standard Specifications for
ITEM 603.82212 — 12” POLYETHYLENE PIPE (TYPE S)
A.
SCOPE
This work shall consist of furnishing and installing polyethylene (PE) pipe type S, at the
locations shown on the plans or as ordered by the Engineer.
MATERIALS AND CONSTRUCTION
