The contractor shall furnish all labor, materials, equipment, and incidentals required and perform all operations in connection with the installation of storm drain inlet filter inserts in accordance with the design shown on the contract Drawings and as specified herein.
Filter insert system shall provide a multiple-stage treatment process to filter storm water flows, remove trash and debris, settle particulate matter, remove lead and zinc, plus absorb and retain hydrophobic hydrocarbon materials.
Filter insert system shall have treatment flow capacity of 150 gallons/minute or greater. Filter insert system shall provide 4.5 cubic feet or more storage for filtered solids material. Trash and debris shall be 4.5 cubic feet or greater.
Filter insert shall provide filter media to target finer solids and dissolved pollutants in storm water. Filter media shall comprise a column of porous media of various types. Filter Media shall be a minimum a 2.5” wide.
Filter insert system shall be fabricated with 304 stainless steel @ 16 gauge.
Filter insert system shall be self-draining within 24 hours for vector control.
For retrofit of existing inlets, filter insert system shall assemble inside existing drain box and must be accomplished without additional excavation or concrete modification.
Filter insert system shall have minimum removal efficiencies at flow rate of 64 gpm as stated below:
|Oil and Grease||80%|
Filter insert system shall be ClearWater BMP or equivalent, as manufactured by:CLEARWATER SOLUTIONS INC