of the existing pipe; it shall be the Contractor’s responsibility to
install the renewal pipe to result in an acceptable grade without the
sag. The Contractor shall take in necessary measures to eliminate
these sags, as approved by the Owner by pipe renewal; digging a
sag elimination pit and bringing the bottom of the pipe trench to a
uniform grade in line with the existing pipe invert or by other
measures that shall be acceptable to the Owner.
Point Repairs - Point repairs are repairs to the existing pipeline
required prior to renewal work. Point repairs shall be located
during the internal inspection of the pipeline. The Contractor shall
repair areas requiring “point repair’ after cleaning and pre-
construction internal inspection is complete and prior to
commencement of renewal work. Contractor shall submit to the
Owner the proposed method(s) of point repair for each area
requiring a point repair for review and approval. Point repairs also
include the joint and pipe infiltration which may affect the
pneumatically assisted sliplining. The Contractor shall notify the
Owner not less than 48 hours in advance of making any particular
point repair. Work shall include supplying necessary materials,
equipment, excavation, sewage diversion in bypassing, dewatering,
and labor.
3.2 INSERTION PITS
A.
Prior to commencing any excavation, Contractor shall submit a detailed
Plan of Construction to identify the location and number of all proposed
insertion pits to the Owner for review. The pits shall be spaced in
conformance with the Liner Pipe Manufacturer's recommended maximum
allowable insertion force that can be exerted onto the liner pipe.
The Contractor shall locate access shafts or insertion pit(s) as shown on
the drawings. The use of additional pits or different locations, as shown,
must be approved, in writing, by the Engineer prior to construction.
Receiving pit locations are not shown on the drawings. Receiving pits
shall be located at manholes or structures only and no excavation shall be
allowed unless a new manhole is designated on the Drawings or as
otherwise approved in writing by the Engineer. Access for receiving pits
shall be through existing manholes or structures. All insertion or
receiving pits shall be designed to be constructed with wood or steel
sheeting, steel plates or steel trench boxes. Shafts or pits shall be
designed in conformance with Section 02210 - Earthwork.
The size of access/receiving shafts shall be as small as possible but
sufficient to allow access for the Contractor's work. The Contractor is
02769-11
