PART 2 - PRODUCTS
2.01 MATERIAL:
A.
C.
CRUSHED GRAVEL:
The Gravel Road Base will be NHDOT - Item 304.3 Crushed Gravel, or Item
304.4 Crushed Stone (Fine Gradation).
TRENCH BACKFILL MATERIALS:
Trench backfill shall be material excavated from the trench that is granular, well
graded friable soil; free of pavement, rubbish, ice, snow, tree stumps, roots, clay
and organic matter; with 30 percent or less passing the No. 200 sieve; no stone
greater than two-third (2/3) loose lift thickness, or six inches, whichever is
smaller.
SEWER AND DRAIN PIPE BEDDING MATERIAL
1. Sewer and drain pipe bedding material shall be Crushed Stone meeting the ASTM
C33/C33M stone size No. 67..
2. Sand Blanket material for sewer and drain pipe shall be graded sand free from
organic materials, graded such that 100 percent passes a %-inch sieve and a
maximum of 15 percent passes a #200 sieve.
PART 3 — EXECUTION
3.01
A.
DISTURBANCE OF EXCAVATED AND FILLED AREAS
DURING CONSTRUCTION:
Contractor shall take the necessary steps to avoid disturbance of sub-grade during
excavation and filling operations, including restricting the use of certain types of
construction equipment and their movement over sensitive or unstable materials,
dewatering and other acceptable control measures.
All excavated or filled areas disturbed during construction, all loose or saturated soil,
and other areas that will not meet compaction requirements as specified herein shall
be removed and replaced with a minimum 12-inch layer of compacted crushed stone
wrapped all around in non-woven filter fabric. Costs of removal and replacement
shall be borne by the Contractor.
The Contractor shall place a minimum of 12-inch layer of special bedding materials
and crushed stone wrapped in filter fabric over the natural underlying soil to
stabilize areas which may become disturbed as a result of rain, surface water runoff
or groundwater seepage pressures, all at no additional cost to the Owner. The
Contractor also has the option of drying materials in-place and compacting to
specified densities
2019 Sewer Replacement Project Earthwork
Nashua, NH 02300-3
