Agenda - Council - 12/14/2010 - Laserfiche WebLink

Home

Part 2.00 — Products 2.01 Materials and Design protect The structural stormwater treatment system shall be made of pre -cast concrete. The manufacturer shall be a member of the American Concrete Pipe Association or the National Pre -cast Concrete Association and meet the following manufacturing requirements: A. Structures shall be designed to comply with ASTM Designation C -478. eco9torm Page 2 of 4 B. Sections shall have watertight joints consisting of either gasketed joints per ASTM C -443, or a butyl mastic sealant conforming to ASTM C -990. C. Pipe openings shall be provided with a flexible rubber sleeve per ASTM C -923, or shall be made watertight by the contractor with cement mortar, and shall be sized to accept pipes of the specified size(s) and material(s). D. Internal components shall be made of stainless steel, fiberglass, and /or high density polyethylene (HDPE). E. Casting for manhole frames and covers shall be vented and per the governing city's requirements. F. All sections shall be cured by an approved method. Sections shall not be shipped until the concrete has attained a compressive strength of 4,000 psi. 2.02 Hydraulic Design The specified stormwater treatment system shall be hydraulically designed for the specific site in which it will be installed. The calibration of the specified system shall account for peak flow rates (supplied to specified stormwater treatment system company by owner /engineer) that correspond with predetermined regional rainfall data to maintain peak removal efficiencies and to not cause upstream flooding or pooling of stormwater. The structural stormwater treatment system shall consist of one round pre -cast concrete structure (D1) with another smaller diameter structure (D2) housed within the main structure D1. The D2 structure should be integrally cast or sealed with a bitumastic sealant to the base of the D1 structure. The D1 structure shall have an on- center, mechanically fastened inlet deflector plate that induces a swirling flow pattern between the D1 and the D2 walls. This area will accumulate, store and retain captured /settled solids deposited by numerous storm events and prevent washout of separated solid pollutants under peak design flow until which time the maximum storage volume of solid contaminants is reached. The D3 internal piping shall be fiberglass or PVC and designed to discharge clean water downstream, while retaining floatable debris within the structure to a defined peak flow rate. TODAY by building forTOMORROW www.royalenterprises.net • 651- 462 -2130 • 800 - 817 -3240 3.09