to the dimensions shown in these Contract Drawings and shall be designed in accordance with CSA.S6-06, the Canadian Highway Bridge Design Code.

The Contractor shall submit Shop Drawings, sealed by a Professional Engineer who is registered and licensed to practice in the Province of Ontario, for the design of the precast concrete culvert sections. The Shop Drawings shall be submitted for review by the Engineer prior to the start of manufacturing of the precast concrete culvert sections.

Waterproofing of the culverts shall conform to Forms OPSS Forms 914, 1213 and 1215, except as amended and extended herein. This work shall include supply and installation of the new rubberized asphalt waterproofing membrane on the new precast concrete culverts, including all surface preparation and tack coats (as required to carry out work to OPSS standards).

Installation of Precast Concrete Block Headwalls shall conform to OPSS Forms 180, 501 (MUNI), 902, 1002 (MUNI), 1010 (MUNI), 1350 (MUNI), AND 1440 (MUNI) shall apply and govern except as amended or extended herein. This work shall consist of all equipment and labour required to install precast concrete Easy Block (or approved equivalent) sections as depicted in the Drawings, complete, including layout, excavation, installation, soil reinforcement, backfill, bedding and compaction. The precast blocks shall be Easy Block plain style blocks by Underground Specialties (or approved equal).

The blocks shall be installed in accordance with the manufacturer's specifications.

The Contractor shall install 100mm diameter perforated sub-drains with filter sock at the locations shown. The work shall conform to OPSS Form 405.

Culvert backfill, cover shall consist of compacted Granular 'A' road base as shown on the Drawings. OPSS Form 314, 501 (MUNI) and 1010 (MUNI) shall apply and govern except as amended or extended herein. The granular material shall be placed in maximum 250mm thick loose lifts and compacted to 100% of Standard Proctor Maximum Dry Density.

12.0 Steel Sheet Pile Channel Walls and Headwalls

OPSS Forms 903, 906 and 911 shall apply and govern except as amended or extended herein. The Contractor supply and install new steel sheet pile walls as detailed in these Drawings, including excavation, pile driving, wales, struts, pile caps, tie-rods, hardware, welding and backfill.

All structural steel shall conform to CAN/CSA G40.21-M, Grade 350W, and shall be hot-dipped galvanized in conformance with CAN/CSA G164-M92.

All bolted connections shall conform to ASTM A325M or A490M and shall include the supply of all nuts, washers, plates, and hardware needed to make a sound connection. All threaded bars, nuts and washers shall be hot-dip galvanized in conformance with