Qualifying Tunneling Contractors for Construction of the Replacement

Full Title: Qualifying Tunneling Contractors for Construction of the Replacement Fort Garry-St. Vital Siphons

B7. SCOPE OF WORK
B7.1 The Work to be done under Tender 1010-2024B shall consist of the installation of a new sewer river crossing (siphon) under the Red River that is approximately 350 m in length with a specified 2100 mm internal diameter casing pipe and two (2) 738 mm internal diameter (900 mm DR 11) HDPE carrier pipes pulled through on casing spacers, and all required Work associated with the installation of the above.

B7.2 The major components of the Work are as follows:
(a) Installation of MTBM launch and receiving shafts
(i) The launch and receiving shafts shall be converted to the upstream and downstream siphon chambers, inclusive of:
♦ Installation of chamber foundation and walls (if not part of construction shafts).
♦ Installation of permanent roof and service access projected to grade.
♦ Installation of intermediate floor(s), ladders, and other man-entry accommodations.
♦ Installation of gates, diversion weirs, and other pipeline appurtenances.
(b) Installation of approximately 350 m long river crossing (siphon) using Microtunnelling:
(i) Installation through clay overburden and underlying limestone bedrock strata.
(ii) 2100 mm internal diameter casing pipe.
(iii) Installation of two HDPE pipes having an internal diameter of 738 mm (900 mm DR 11) to be pulled through casing pipe on casing spacers.
(c) Rehabilitation of existing infrastructure:
(i) Cured-in-place pipe (CIPP) lining of the existing 500 mm AC force main.
(ii) CIPP lining of the existing four (4) 600 mm cross connections.
(iii) CIPP or slip lining of the existing 1350 mm gravity sewer to be repurposed as an overflow pipe.
(d) Installation of a new discharge chamber fitted with flap gates on the four (4) 600 mm cross connection, weir wall for overflows, connection of the 500 mm AC force main and the new 1350 mm reinforced concrete pipe (RCP).
(e) Installation of 1350 mm RCP upstream and downstream of the sewer river crossings connection the upstream siphon chamber to the discharge chamber on the upstream, and the downstream siphon chamber to the existing St. Vital Trunk on the downstream side.
(i) These installation shall be completed using trenchless methods crossing Abinojii Mikanah.
(f) Site restoration works.
B7.3 The Scope of Work is identified in the preliminary drawings attached to this RFQ. Proponents are advised that the attached information is preliminary and subject to final modifications. A full final set of documents will be issued under Tender 1010-2024B for the final bidding process.
B7.4 The Scope of Work under evaluation in B33 is specific to items in B7.2(a) and B7.2(b).

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