inch in any dimension.
3.12.4
Electrical Distribution System
Direct burial cable and conduit or duct line shall have a minimum cover of
600 mm 24 inches from the finished grade, unless otherwise indicated.
[Special trenching requirements for direct-burial electrical cables and
conduits are specified in Section 16302N UNDERGROUND TRANSMISSION AND
DISTRIBUTION.]
3.12.5
Sewage Absorption Trenches or Pits
**************************************************************************
NOTE: Delete these paragraphs when sewage
absorption trenches or pits are not included in the
project. Consult a geotechnical engineer and local
standards in selecting bracketed information.
**************************************************************************
3.12.5.1
Porous Fill
Backfill material consisting of clean crushed rock or gravel having a
gradation [such that 100 percent passes the 50 mm 2 inch sieve and zero
percent passes the 12.5 mm 1/2 inch sieve.] [conforming to the requirements
of gradation [4.75 mm] [No. 4] [_____] for coarse aggregate in ASTM C 33.]
3.12.5.2
Cover
**************************************************************************
NOTE: Select appropriate bracketed information to
correspond to the design indicated on the drawings.
**************************************************************************
[Filter fabric] [Concrete] [Kraft paper conforming to FS A-A-203, Grade B,
No. 2, 22.7 kg 50 pound weight] [or a layer of straw at least 50 mm 2 inches
thick] as indicated.
3.12.6
Pipeline Casing
Provide new smooth wall steel pipeline casing under [new] [existing]
[railroad] [and] [pavement] [in a trench] [by the boring and jacking method
of installation]. Provide each new pipeline casing, where indicated and to
the lengths and dimensions shown, complete and suitable for use with the
new piped utility as indicated. [Install pipeline casing by dry boring and
jacking method as follows:]
3.12.6.1
Bore Holes
Mechanically bore holes and case through the soil with a cutting head on a
continuous auger mounted inside the casing pipe. Weld lengths of pipe
together in accordance with AWS D1.1/D1.1M. Do not use water or other
fluids in connection with the boring operation.
3.12.6.2
Cleaning
Clean inside of the pipeline casing of dirt, weld splatters, and other
foreign matter which would interfere with insertion of the piped utilities
by attaching a pipe cleaning plug to the boring rig and passing it through
the pipe.
SECTION 02300
Page 36
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