R L Alia Company 5/4/2017 - Laserfiche WebLink

Contractor shall remove the existing steel liner and perform associated concrete patch repairs to the existing parshall flume. Following diversion of water from the SHW, the Contractor shall verify details of the parshall flume liner plate and allow the Engineer access for inspection of the flume and liner plate condition. It is anticipated that a steel plate exists along the flume,and is anchored to the concrete. The Contractor shall remove all portions of the plate, or to a minimum of 1 inch below the surface of concrete, unless directed otherwise by the Engineer. Patch all areas of removed concrete with epoxy grout.The patched areas shall be a minimum of 6 inches x 6 inches with a minimum depth of'/z". The grout shall be placed on a roughened surface. The Contractor shall furnish and install a slide gate on the inside wall of the SHW over the newIt permanent bypass pipe,as indicated in the plans_ Slide gate dimensions shall provide a minimum clear opening greater than pipe diameter and shall perform in accordance with AWWA C561. Slide gate shall be operable by a non-rising stem mechanism.Gate operator shall consist of a 2-inch square nut positioned within a cast iron box and cover(per Everett Std.Detail 604)that is grouted into the SHW structure top slab. Slide gate shall be manufactured by Golden Harvest Inc., Waterman Industries, or approved equal. All parts of the slide gate shall have a minimum thickness of 1/4 inch. Slide gate manufacturer's nameplate shall include serial number, size,class,or pressure rating,and year of manufacture. • Guide Frames, Invert Spigot, Flange, and Stems shall be Type 304L Stainless Steel in accordance with ASTM A276 • Disc and Yoke Retainer shall be Type 304 Stainless Steel in accordance with ASTM A240 • Guide frame shall include Ultra High Molecular Weight (UHMW) Polyethylene seats on both sides • Invert seal shall be Neoprene in accordance with ASTM D2000 • All fasteners and bolts shall be Type 304 Stainless Steel The slide gate shall be fully assembled in a shop to ensure that all components fit together properly, with proper clearances and alignment. Contractor shall submit shop drawings of slide gate and components for approval by the engineer. A stainless steel spigot or flange shall be provided as part of the gate frame and seals shall be provided to prevent excessive leakage. Seals shall be attached to the frame and held in place by a bolted retainer bar and shall extend along sides and across the invert on slide gates. Seals shall be field replaceable and adjustable and shall not protrude into the gate opening. The lift nut shall be flanged and supported on roller bearings. The bearings and lift nut shall be mounted in a housing supported by a pedestal or mound on the yoke of the gate. Mechanical seals shall be provided around lift nut and shaft. Anti-friction thrust washers or bearing plates will not be permitted. The yoke to support the operator-nut stand shall be formed by two structural members welded at the top of the guides to provide a one piece rigid frame. The operator housing shall be cast steel or cast iron and shall be furnished with a threaded bronze lift nut to engage the threaded portion of the stem.An adjustable bronze stop collar shall be provided to limit upward and downward travel.[M°d`fi`a°"Aaa`°�"°'#i] 6-02.3(29)D Epoxy Coating of Internal Surfaces I Upon completion, and acceptance by the engineer, of all internal modifications to the SHW structure the contractor shall install a protective epoxy coating to all existing and new concrete surfaces. All surfaces lying below the existing grate-platform shall be cleaned and an epoxy coating applied, in accordance with manufacturer's recommendations. LAT R February,STREET RE GU O 2017 AND CSO CONTROLS (SRO1, SRO2,AND SRO3) WO No—UP3398-31 SP— 160