ClearWater BMP Guideline Information

Guideline Information

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.

Product

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.

Capacity

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 Media

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.

Fabrication

Filter insert system shall be fabricated with 304 stainless steel @ 16 gauge.

Drainage

Filter insert system shall be self-draining within 24 hours for vector control.

Installation

For retrofit of existing inlets, filter insert system shall assemble inside existing drain box and must be accomplished without additional excavation or concrete modification.

Treatment Performance

Filter insert system shall have minimum removal efficiencies at flow rate of 64 gpm as stated below:

Constituent Removal Efficiency
TSS 90%
Oil and Grease 80%
Lead (Pb) 80%
Zinc (Zn) 80%
Manufacturer

Filter insert system shall be ClearWater BMP or equivalent, as manufactured by:

CLEARWATER SOLUTIONS INC
PO Box 2078
Vista, CA 92085-2078
800-758-8817
Alternative Systems
Alternative filter insert system or materials must be pre-approved in writing by the Engineer prior to bid date. Alternative material packages must be submitted to the Engineer a minimum of fifteen (15) days prior to bid date. Submittal packages must include, as a minimum, the following:
  • Laboratory testing and associated engineered calculations quantifying the hydraulic capacity (treatment flow rate capacity and flow-through capacity) of the proposed alternative system. Alternative systems that cannot document hydraulic capacity as stated in "Capacity" above will not be accepted.
  • Independent laboratory testing quantifying the treatment performance of the proposed alternative system at treatment flow rate of 64 gpm for the following constituents: TSS, Oil and Grease, Lead (Pb), and Zinc (Zn). Alternative systems that cannot document removal efficiencies as stated in "Treatment Performance" above will not be accepted.
  • Documentation regarding the capacity, type of filter media, and installation method for the alternative system. Alternative systems that cannot satisfy specifications outlined in "Capacity", "Filter Media”, and "Installation" above to the satisfaction of the Engineer will not be accepted.