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BayFilter Specifications



A. The BayFilter™ System’s internal components manufacturer selected by the Contractor and approved by the Engineer, shall furnish all labor, materials, equipment and incidentals required to manufacture the BayFilter System components(s) specified herein in accordance with the attached Drawing(s) and these specifications.

B. Concrete structures and any appurtenances that form an integral part of the BayFilter™ treatment unit shall as described in Section 2.1B of these specifications.


A. The quality of materials, the process of manufacture, and the finished sections shall be subject to inspection by the Engineer.  Such inspection may be made at the place of manufacture, or on the worksite after delivery, or at both places, and shall be subject to rejection at any time if material conditions fail to meet any of the specification requirements.  If a BayFilter System component(s) is rejected after delivery to the site, it shall be marked for identification and removed from the site.  Any BayFilter System Component(s) which have been damaged beyond repair during delivery will be rejected.


A. Plan, elevation, and profile dimensional drawings shall be submitted to the Engineer for review and approval. The Contractor shall be provided with the approved plan, elevation, and profile dimensional drawings.



All components including concrete structure(s), PVC manifold piping, filter cartridges, flow spreader(s)/energy dissipator(s) shall be provided by BaySaver Technologies Inc., 1302 Rising Ridge Road, Unit 1, Mount Airy, MD (800.229.7283).

A. PVC Manifold Piping:  All internal PVC pipe and fittings shall meet ASTM D1785.  Manifold piping shall be provided to the contractor partially pre-cut and pre assembled.

B. Filter Cartridges:  External shell of the filter cartridges shall be substantially constructed of  polyethylene or equivalent material acceptable to the manufacturer. Filtration media shall be arranged in a layered fashion to maximize available filtration area. An orifice plate shall be supplied with each cartridge to restrict flow rate to a maximum of 30 gpm.

C. Filter Media:  Filter media shall be by BaySaver Technologies Inc. or approved alternate.  Filter media shall consist of the following mix. Sand media shall have an effective particle size of not more than 0.49 mm, it shall have an angular grain shape, a hardness of 7, be 99% silica, and not leach nutrients. The media shall also include a blend of Perlite and Activated Alumina.

D. Flow Spreader/Energy Dissipator:  Shall be constructed of polyethylene or equivalent material acceptable by the manufacturer. 


  1. The stormwater filter system shall be an offline design capable of treating 100% of the required treatment flow at full sediment load conditions.
  2. The stormwater filter system’s cartridge units shall have no moving parts.
  3. The stormwater treatment unit shall be designed to remove at least 80% of the suspended solids load. Said removal shall be based on full-scale  testing using SIL-CO-SIL 106 media gradation with a d50 of 23 microns (manufactured by US Silica) or equivalent. Said full scale testing shall have included sediment capture based on actual total mass collected by the stormwater filtration system.
  4. The stormwater filtration system shall reduce incoming turbidity (measured as NTUs) by 50% or more and shall not have any components that leach nitrates or phosphates.
  5. The stormwater filtration cartridge shall be equipped with a hydrodynamic backwash mechanism to extend the filter’s life and optimize its performance. Inlet flow shall be upflow.
  6. The stormwater filtration system shall be designed to remove a minimum of 40% of the incoming Total Phosphorus (TP) load.
  7. The stormwater filtration system’s cartridge units shall have the following minimum flow and sediment load capacities:

Design Flow  per BFC- gpm Nominal

Treated Sediment Load for 80% Sediment Removal – Lbs










A. Precast Concrete Vault:  Shall be provided according to latest revisions of ASTM C478, C858, and C1433. Precast concrete vaults shall be manufactured by an NPCA certified plant and shall be provided by BaySaver Technologies, Inc.

B. Vault Joint Sealant:  Shall be Conseal CS-102 or BaySaver approved.

C. Doors:  Doors shall have hot-dipped galvanized frame and covers or BaySaver approved.  Covers shall have diamond plate finish.  Each door to be equipped with a recessed lift handle and a locking latch with hold-down bolts.  Wrench to be provided for each set of doors, upon request.  Doors shall meet H-20 loading requirements for incidental traffic at a minimum.

D. Frames and Covers:  Frames and covers shall be gray cast iron and shall meet AASHTO H-20 loading requirements or BaySaver approved.

E. Ladders:  Ladders shall be constructed of aluminum or steel reinforced copolymer polypropylene conforming to ASTM D-4101.  Ladder shall bolt in place and be equipped with a pull-up ladder extender that shall extend a minimum of 24 inches above the top rung of ladder.  Ladder shall meet all ASTM C-497 load requirements.

F. Steps:  Steps shall be constructed of copolymer polypropylene conforming to ASTM D-4101 or BaySaver approved.  Steps shall be driven into preformed or drilled holes once concrete is cured.  Steps shall meet the requirements of ASTM C-478 and AASHTO M-199.


Specifications for all contractor-provided components are minimum requirements.  If a higher standard is shown on the plans or described in another section of the technical specifications, then the higher standard shall govern.

A. Sub-Base:  Sub-base shall be six-inch minimum of ¾-inch minus rock, 95% compaction.  Compact undisturbed sub-grade materials to 95% of maximum density at +/-2% of optimum moisture content.  Unsuitable material below sub-grade shall be replaced to engineer's approval.

B. Concrete:  Concrete shall be 3000 psi minimum at 28-day strength, ¾-inch gravel, 4-inch slump maximum, placed within 90 minutes of initial mixing.

C. Silicone Sealant:  Shall be pure RTV silicone conforming to Federal Specification Number TT S001543A or TT S00230C or Engineer approved.

D. Grout:  Shall be non-shrink grout meeting the requirements of Corps of Engineers CRD-C588.  Specimens molded, cured and tested in accordance with ASTM C-109 shall have minimum compressive strength of 6,200 psi.  Grout shall not exhibit visible bleeding.

E. Backfill:  Backfill shall be ¾-inch minus rock at 95% compaction.



A. Vault top finish grade shall be even with surrounding finish grade surface unless otherwise noted on plans.

B. Contractor shall grout all inlet and outlet pipes flush with vault interior wall. 

C. Sanded PVC fittings shall be used on all PVC inlet and outlet pipes.

D. The contractor responsible for inspecting and/or completing installation of flow spreaders/energy dissipators.

3.2 ANTI-FLOTATION BALLAST  (Where Required)

A. Ballast shall be to the dimensions specified by the engineer and noted on the data block.  Ballast shall run the entire length of the long side of the vault, both sides.  Ballast shall not encase the inlet and/or outlet piping.  Provide 12" clearance from outside diameter of pipe.


A. Remove all excess materials, rocks, roots, or foreign material, leaving the site in a clean, complete condition approved by the engineer.  All filter components shall be free of any foreign materials including concrete.


A. Filter cartridges shall not be installed until the project site is clean and stabilized or if the inlet and outlet pipes are temporarily blocked off.  The project site includes any surface that contributes storm drainage to the BayFilter.  All impermeable surfaces shall be clean and free of dirt and debris.  All catch basins, manholes and pipes shall be free of dirt and sediments.


A.  Contractor to strictly follow the approved design and construction specifications. Any substitutions are to be pre-approved by the inspector and design engineer in writing prior to placement of materials.

B. The stormwater filtration system(s) may not be activated until all contributing drainage areas to each facility are stabilized.  Construction of the facility shall not proceed without prior authorization of the inspector. 

C. No "rock dust" can be used for sand.

D. Unless otherwise noted, all poured in place concrete shall be 3500 psi at 28 days.

E. Contact "Miss Utility" at 1-800-257-7777 at least 48 hours prior to the start of construction.


A. Concrete placement and strength shall meet the requirements of the latest edition of the Maryland Department of Transportation, State Highway Administration Standard Specifications for Construction and Materials, Sections 414 and 902, Mix No. 3.



A. Installation of the BayFilter System(s) shall be performed per manufacturer’s Installation Instructions. Such instructions can be obtained by calling BaySaver Technologies, Inc. at 1.800.229.7283 or by login to Easy Installation.