HDPE Flange

1. Slurry walls: No waterproofing to be used on the walls. The exterior face of the slurry wall is inaccessible for waterproofing by nature of its construction. In the report the statement was made that "Slurry walls are usually fairly free of leaks." Given the 42" thickness of the walls and the intent to provide in the specifications that all running leaks would be grouted, the decision was taken not to require the application of waterproofing on the interior surface of these walls.

2. Bottom slab: High-density polyethelene (HDPE) bentonite sheet was recommended. This sheet is a laminate of three materials: high-density polyethelene sheeting, chemically modified bentonite, and a spun polypropylene overlay.

3. Top slab: Liquid-applied rubberized asphalt was recommended. HDPE bentonite sheet was also recommended.

Located just above the hole on the adjacent soldier pile, the soldier pile endstop treatment installed under contract C11A1 was visible to a width of 6 to 8 inches and a height of 1 foot. The endstop treatment consists of a 1/8 inch thick steel plate, tack welded to the pile flanges to facilitate cleaning the end piles of the primary panel during excavation of the secondary panels.

Credit: HDPE Flange

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