HomeMy Public PortalAbout389024Metropolitan
St. Louis Sewer
District
2350 Market Street
St. Louis, MO 63103-2555
(314) 768-6200
April 1, 2011
Tim Ritchie
StormTech/ADS
Storm Water Product Manager
13109 Padre Ave
Keller, TX. 76244
RE: ADS Isolator Row, St. Louis MSD Submission
Provisional Use Level (PUL) Approval within District
Dear Sir:
The Metropolitan St. Louis Sewer District (MSD) has reviewed your application regarding the
ADS Isolator Row for use as a Best Management Practice for stormwater management. MSD is
pleased to provide the Provisional Use Level (PUL) approval for use of the ADS Isolator Row as
a pretreatment and / or supplement for other BMP's subject to the following provisions:
• The ADS Isolator Row will be considered for use on a case by case basis. This approval
is based on compliance with the requirements listed in MSD's Proprietary Water Quality
Products and the MSD's Stormwater Management Program (Rev. Jan. 2009).
• This device should not be considered for certain online BMP's such as ponds, or
wetlands.
• The ADS Isolator Row must be sized to capture all floatable trash and free oil, and
remove 50% of total suspended solids for the OK-110 particle size distribution.
• 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 and hydro -flushing truck.
• Each Isolator Row shall have a 48" concrete manhole with a HS-20 rated cast iron frame
and a minimum 30-inch diameter access lid.
• Project specific design calculations, material specifications, and maintenance plan
furnished by ADS must be included within the project's "Stormwater Management
Facilities Report" prepared by the consulting engineer.
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