HomeMy Public PortalAbout460951Metropolitan
St. Louis Sewer
District
2350 Market Street
St. Louis, MO 63103-2555
(314) 768-6200
www.stlmsd.com
October 24 2012
Mr. Greg Sterchi
Fluid Process Equipment, Inc.
815 S. 9th Ave.
LaGrange, IL 60525
RE: CULTEC Contactor & Recharger Chambers
Provisional Use Level (PUL) Approval within District
Dear Mr. Sterchi:
MSD has reviewed your application regarding use of the CULTEC Contactor & Recharger Chambers
for stormwater storage. MSD is pleased to provide the device PUL approval for use as a stormwater
storage system.
• The CULTEC Contactor & Recharger Chambers is only approved for use on redevelopment
projects (of any size). Only one (1) installation shall be allowed under this approval.
• The CULTEC Contactor & Recharger Chambers may be used to provide storage for peak
flood detention (Qp), channel protection (CPv), or water quality (WQv) design storm volumes.
Where the CULTEC Contactor & Recharger Chambers are provided for storage of WQv,
geotextile liner shall be provided on the interior bottom and sides of the unit.
• The CULTEC Contactor & Recharger Chambers are not intended to be a device that is used as
a standalone water quality BMP. Where the CULTEC Contactor & Recharger Chambers are
used within a water quality strategy (e.g., as water quality storage to filter BMPs), then
adequate pre-treatment shall be provided upstream of the CULTEC Contactor & Recharger
Chambers.
• The CULTEC Contactor & Recharger 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 CULTEC Contactor & Recharger 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 CULTEC 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 CULTEC
Contactor & Recharger Chambers September 5, 2012 product submittals. Please also note the
following.
1) Prior to MSD approval of any development plans, the product maintenance plan will be
updated to address any remediation procedures needed to repair the system should it be
damaged.
2) 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.
• The initial design and installation of the CULTEC Contactor & Recharger Chambers System
in the MSD shall include the following:
1) Sealed engineering documents by a Missouri professional engineer.
2) Construction supervision by CULTEC, 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.
The CULTEC Contactor & Recharger Chambers are not approved for general use at this time.
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. This approval shall be for a period of two (2) years from the date of this
letter.
Sincerely,
Jason Peterein, P.E.
Civil Engineer (Proprietary BMP Committee Chair)
Engineering/Planning
Metropolitan St. Louis Sewer District