GENERAL AND PARTICULAR SPECIFICATIONS OF ... - UNDP
GENERAL AND PARTICULAR SPECIFICATIONS OF ... - UNDP
GENERAL AND PARTICULAR SPECIFICATIONS OF ... - UNDP
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the barrel of the pipe and the trench wall shall be 20mm<br />
on each side of the pipe. The width of the trench above<br />
that level may be as wide as necessary for sheeting and<br />
bracing and the proper performance of the work.<br />
Trench for Water Supply System shall be of a depth to<br />
provide minimum cover over the top of 300mm and avoid<br />
interference of water lines with other utilities. Width<br />
of trench shall be a maximum of 200mm on each side of the<br />
pipe.<br />
The width of trenches for electrical and telephone cables<br />
shall be as specified in their relative section. Banks<br />
may be sloped or widened to facilitate placement of<br />
cables, but not to an extend that will cause interference<br />
with other utilities.<br />
Excavation for appurtenant structures for manholes,<br />
septic tank, percolating pit and similar structures shall<br />
be sufficient to allow a minimum of 300mm of clear space<br />
between their outer surfaces shoring timbers which may be<br />
used to protect the banks.<br />
3-20<br />
<strong>SPECIFICATIONS</strong><br />
EXCAVATIONS<br />
B 13<br />
BACKFILL <strong>AND</strong> FILL<br />
Approved suitable excavated material as specified under<br />
“MATERIALS” shall be used in the backfilling and filling<br />
next to footings, foundations underground structures,<br />
under sub-floors, etc... and shall be laid in layers not<br />
exceeding 200mm and compacted with compaction equipment,<br />
as approved by the Engineer. Moisture content shall be<br />
adjusted as directed by the Engineer and 95% of dry<br />
weight compaction accordance to ASTM: D1557-70 shall be<br />
achieved.<br />
Should the quantity of the excavated material be not<br />
sufficient for the process of backfill and fill, the<br />
Contractor shall obtain the quantity required of such<br />
backfill and fill from approved borrow pits and transport<br />
same to the Site of work at his own expense.<br />
No backfill shall be executed until the footings,<br />
foundations, etc., have been inspected, measured and<br />
approved by the Engineer.<br />
Trenches should be backfilled until all required tests<br />
are performed and until the Engineer has verified that<br />
the Utility systems have been installed in accordance<br />
with the
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