BYPASS PUMPING
Bypass pumping shall usually be made by plugging the upstream manhole and
pumping the sewage into the downstream manhole, or by pumping into an
alternate sewer system of adequate capacity to handle the additional sewage flow.
The pump and bypass lines shall be sized to handle the anticipated flows.
Contractor shall investigate and determine the purpose and source of all lateral
connections. Methods shall include, but are not limited to, internal inspections
within adjacent buildings, smoke testing and dye testing. Contractor shall record
location, size, material and relative invert elevation of each lateral connection with
respect to the pipeline. Contractor shall note presence of floor drains or other
outlet pipes in adjacent buildings. Contractor shall obtain written approval from
the Owner prior to any testing and/or building entry. Contractor shall verify that
lateral connections have been installed according to plumbing codes and have
traps to prevent the migration of odors into buildings.
3.02 INSTALLATION PROCEDURES
A.
INSTALLATION
Installation of the liner shall be through existing or new manholes. Excavation for
liner insertion shall not be permitted except to remove and replace the manhole
cones, if necessary and/or required.
WATER
Where water is used for insertion and curing processes it may be supplied from
existing fire hydrants. The Contractor shall make arrangements for obtaining
water.
RESIN IMPREGNATION
1. The Contractor shall designate a location where the liner tube will be
impregnated with resin prior to installation. The liner tube shall be
impregnated by vacuum or other approved means. The Contractor shall allow
the Owner and Engineer to inspect the materials and “wet out” procedure. A
resin and catalyst system compatible with the requirement of this method shall
be used.
2. Materials shall be transported to, and stored at, the site in such a manner that
they will not be damaged, exposed to direct sunlight, or result in any public
safety hazard. All materials shall be subject to inspection and review by the
Engineer prior to installation.
LINER INSERTION
The impregnated tube shall be inserted through existing or new manholes and the
application of a hydrostatic head, compressed air, or other means sufficient to fully
extend it to the next designated manhole. The liner shall be installed at a rate
greater than 3 feet per minute and less than 10 feet per minute.
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