sand essentially free of organic matter, plastic fines (clay) and debris, and shall
meet the gradation requirements below:
Sieve Opening Percent Passing (weight)
6 inch 100
No 4 25 - 70
No 200 0-12
B. CRUSHED GRAVEL:
The Gravel Road Base will be NHDOT - Item 304.3 Crushed Gravel, or Item
304.4 Crushed Stone (Fine Gradation).
C. BACKFILL MATERIALS:
1. Class B Backfill:
Class B backfill shall be granular, well graded friable soil; free of 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.
2. Select Backfill:
Select backfill shall be granular, well graded friable soil, free of rubbish, ice,
snow, tree stumps, roots, clay and organic matter, and other deleterious or
organic material; graded within the following limits:
Sieve Size Percent Finer by Weight
3” 100
No. 10 30 - 95
No. 40 10-70
No. 200 0-10
D. SEWER PIPE BEDDING MATERIAL
1. Sewer pipe bedding material shall be screened gravel or crushed stone meeting
the ASTM C33/C33M stone size No. 67..
2. Sand blanket material for sewer pipe shall be graded sand free from organic
materials, graded such that 100 percent passes a “4-inch sieve and a maximum of
15 percent passes a #200 sieve.
PART 3 — EXECUTION
3.01 DISTURBANCE OF EXCAVATED AND FILLED AREAS
2019 CIPP Lining Project Earthwork
Nashua, NH 02300-3
