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2019-04-10 Barracuda Approval April 10, 2019 Baysaver Technologies, LLC Attention: Brian Rustia, PE RE: BaySaver Barracuda Hydrodynamic Separator Dear Mr. Rustia, The Metropolitan St. Louis Sewer District (MSD) has reviewed the 11/25/2018 application for the BaySaver Barracuda Hydrodynamic Separator and is pleased to provide Highway Use Level (HUL), and Redevelopment Use Level (RUL) for use as a stand-alone water quality BMP subject to the following provisions. • The Barracuda is only approved for use on public highway and roadway projects and for redevelopment sites less than 5 acres. This approval is based upon compliance with requirements listed in MSD’s Proprietary Water Quality Products and the MSD’s Stormwater Management Program (Rev. Jan. 2009). • The Barracuda must be sized to capture all floatable trash and free oil, and remove 80% of total suspended solids for the OK-110 particle size distribution at the site water quality flow-rate (WQf). Procedures for calculating WQf are provided in Appendix D.10 of the Maryland Stormwater Design Manual (2000). Table 1 provides a list of approved models and their respective instantaneous peak treatment WQf. The 2400 micron screen will be used. Model Manhole Diameter [ft] Max Treatment Flow [cfs] Barracuda S3 3 0.61 Barracuda S4 4 1.08 Barracuda S5 5 1.69 Barracuda S6 6 2.43 Barracuda S8 8 4.32 Barracuda S10 10 6.75 Table 1. Maximum Water Quality Treatment Flow Rate (WQf) by Model • Only concrete manholes are allowed at this time. • Devices should be configured as off-line units, downstream from a diversion manhole. In most cases the BMP will be installed without the need to store the water quality volume (WQv) upstream of the unit. • All devices shall provide a minimum sediment storage capacity of 10 ft3. Page 1 of 2 • Confined space entry shall not be a requirement for routine maintenance. No special tools or attachments should be required to provide routine maintenance with a vacuum pumping truck. • All proprietary lids and covers should be captive components. The minimum size access hole is 30 inches in diameter. Project specific design calculations and maintenance plans furnished by BaySaver must be included within the project’s “Stormwater Management Facilities Report” prepared by the consulting engineer. MSD reserves the ability to withdraw or modify this approval based on subsequent information, including information indicating that the BaySaver Barracuda Hydrodynamic Separator does not satisfy MSD rules, requirements, or construction and material specifications. Sincerely, Kaleena Menke, PE BMP Committee Chair Engineering / Development Review Page 2 of 2