25C - AGMT - CATCH BASIN PROJ - Laserfiche WebLink

Home Browse Search

EQUIPMENT DESIGN & SPECIFICATIONS REPORT: DRAINPACTm CATCH BASIN INSERT Description/Design/Engineering Full Trash Capture United Storm Water's DralnPacT"' meets the full trash capture definition of the RFP as it is capable of trapping all particles larger than 5 mm in size. Equipment & Design Elements United's DrainPacTm is a treatment control BMP product that captures and treats urban runoff before it enters the storm drain system (see attached Technical Drawings. This multi-layer filtration devise Is installed in drop inlets or curb inlets in a manner that does not interfere with lateral line water flow. General specifications of this product are as follows: • Frame assembly will be constructed from 12-gauge 304 stainless steel • Filter liner will be fabricated from a combination of 4 oz non-woven polypropylene filter cloth and PVC mesh • Support basket will be constructed from a high density polymer rated at 850 Ib/sq It This product is custom made in-house to fit any shape or size of catch basin utilizing single or multiple units as required. The smallest workable catch basins for this product would be 6" x 6. The largest size of a single DrainPacTm unit would be 48" x 48" for drop inlets and 82" x 12" for curb inlets. Catch basins larger than these standard sizes would be fitted with multiple units. Installation Specifications The DrainPacT"' could be used in conjunction with a CleanScreen"A Automatic Retractable Screen (ARS) and/or Connector Pipe Screen (CPS) for added effectiveness based on the level of trash and debris that commonly accumulates at the site. Field inspections of catch basins will determine if this product is appropriate for each respective storm drain. For drop inlets the product will be gravity held in place and will rest on the existing catch basin grate shelf. For curb inlets the product will be mounted to the forward wall of the catch basin below the flow line. Materials The DrainPacTM is constructed from non-corrosive materials with the frame and mounting brackets made from stainless steel; the filter liner is composed of PVC mesh (sides only) for overflow bypass, and non-woven polypropylene (bottom only) for treating petroleum hydrocarbons; and the support basket Is made from a high density biaxial geogrid material. See attached Technical Drawings for drop inlet and curb inlet configurations and material specifications. Flow Rating Site appropriate maintenance frequencies of this product will help to ensure effective and trouble free functioning of this product. Insufficient inspection and/or cleaning frequencies that allow an excess amount of material to accumulate in the filter liner can significantly affect the flow rate of water through the product. See Filter Testing Report for observations regarding head loss and Flow Rate Testing and Flow Rate Capacity reports for additional data. Estimated Design Life Design life of the DrainPacTAI is dependent on the flows to the site. Average life of a properly maintained unit is three to five years for the filter liner before requiring liner change-out, and the stainless steel frame it reusable for liner replacement which is generally only required due to mishandling/abuse of the product. p. 3 25C-10 EXHIB11" A