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Triton PUL 1-31-18 1 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. 2 • 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