HomeMy Public PortalAboutTriton PUL 1-31-18
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January 31, 2018
Triton Stormwater Solutions
Attn: Mr. James Maier
7600 East Grand River, Suite 195
Brighton, MI 48114
RE: Triton Stormwater Solutions – Chamber System for Stormwater Management
Provisional Use Level (PUL) Approval within the District
Dear Mr. Maier:
MSD has reviewed your application regarding use of the Triton Stormwater Solutions Chamber
System (“Triton Chambers”). MSD is pleased to provide the chambers PUL approval for use as
a stormwater storage system.
• The Triton Chambers may be used to provide storage for peak flood detention (Qp),
channel protection (CPv), or water quality (WQv) design storm volumes. Where the
Triton Chambers are provided for storage of WQv, geotextile liner shall be provided on
the interior bottom and sides of the chambers, and shall meet or exceed MSD Standard
Construction Specifications for Geotextile Fabric.
• The Triton Chambers on their own are not intended to be a device that is used as a
standalone water quality BMP. Where the Triton Chambers are used within a water
quality strategy (e.g., as water quality storage in conjunction with filtering BMPs), then
adequate pre-treatment such as the header row shall be provided upstream of the
storage.
• The Triton Chambers may be used as part of an infiltration system, subject to MSD
design requirements for infiltration systems.
• Consistent with MSD Rules and Regulations, the use of buried storage shall be avoided
on residential type projects.
• The Triton Chambers should be kept off-line until the construction site is stabilized and
otherwise protected from sediment build-up during and after construction.
• Adequate access and inspection access shall be provided.
• Any proprietary lids and covers should be captive components.
• Project specific design calculations and maintenance plans furnished by Triton shall be
included within the project’s “Stormwater Management Facilities Report” prepared by
the consulting engineer. All applicable elements of the design shall comply with the
Triton Stormwater Solutions product submittals. Please also that site specific
construction details are required for each project. MSD is providing this product
approval letter with the condition that all engineering details needed for subsequent
shop drawing and construction approval will be developed prior to MSD approval of
engineering plans. Please advise any potential customers of this, as this could
potentially impact their project’s design and construction schedule.
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• The initial design and installation of the Triton Chambers System in the MSD shall
include the following:
1) Sealed engineering documents by a professional engineer licensed in Missouri.
2) Construction supervision by Triton Stormwater Solutions, to ensure the product’s
installation requirements are met.
3) Shop drawings indicating elevations of flowlines, pipe inverts, etc. prior to
installation.
4) An as-built survey, arranged by the manufacturer or vendor, of the proprietary
storage device to be performed by a Missouri-registered Professional Land
Surveyor once the device has been installed, and prior to any testing or
monitoring.
5) Quarterly visual inspections of the proprietary device during its’ first year of
operation, performed by you or your representative. MSD requests to be invited
to these inspections to further enhance familiarity and understanding of the
device.
6) Formal reports shall be submitted to MSD, including as-builts and at each
quarterly inspection. The reports shall include a summary description and
photographs of the structure, inlet, internal conditions of the structure, and outfall
conditions, etc. The reports shall include evaluating the performance of the
owner’s adherence to the approved maintenance program, and offer
suggestions for any areas of improvement.
MSD reserves the ability to withdraw or modify this approval based on subsequent information,
including information indicating that this BMP does not satisfy MSD rules, requirements, or
construction specifications.
Sincerely,
Jason Peterein, P.E.
Principal Engineer (Proprietary BMP Committee Chair)
Engineering/Planning-Development Review