HomeMy Public PortalAboutRain_Guardian_050322Metropolitan St. Louis
Sewer District
2350 Market Street
St. Louis, MO 63103
May 3, 2022
Mr. Mitch Haustein
Anoka Conservation District
1318 McKay Dr, NE, Ste 300
Ham Lake, MN 55304
RE: Rain Guardian PreTreatment Systems
Dear Mr. Haustein,
The Metropolitan St. Louis Sewer District (MSD) has reviewed your application of the Rain
Guardian line of products. Products covered by this letter are the Bunker and Turret systems.
These systems may be used as supplemental pretreatment features on bioretention and other
MSD-approved filtration systems approved as stand-alone water quality BMPs, subject to the
following:
1. Proposed uses and designs of the device shall be in accordance with MSD rules,
requirements, and construction specifications in addition to the guidelines outlined in the
submittal you provided to MSD on February 24, 2022.
2. The Bunker and Turret systems may be used as an enhancement to filtration system
pretreatment on new development, redevelopment, and highway/roadway projects. The
use of these systems shall be subordinate to MSD standard pretreatment design
requirements.
3. The Bunker and Turret systems may be used as components to enhance maintenance and
operation in new private stormwater management facility designs and retrofit scenarios
where conventional pretreatment features are either not required or were not applied.
4. Some applications may require a rock blanket or additional erosion control downstream
of the pretreatment system. Additional pretreatment measures, as determined by the
consulting Engineer and/or MSD, may be required.
5. Project specific design calculations and maintenance plans shall conform to the
manufacturer's recommendations and must be included within the project's "Stormwater
Management Facilities Report" prepared by the consulting Engineer.
Metropolitan St. Louis
Sewer District
2350 Market Street
St. Louis, MO 63103
MSD reserves the ability to withdraw or modify this approval based on subsequent information,
including information indicating that the systems do not satisfy MSD rules, requirements, or
construction and material specifications.
Sincerely,
�/ 1
A.
Curtis Zurliene, P.E.
Civil Engineer (BMP Committee Chairman)
Engineering / Planning - Development Review
Metropolitan St. Louis Sewer District