HomeMy Public PortalAboutBelgard_PUL-PICP approval letter 11-13-14MSC
Metropolitan
St. Louis Sewer
District
2350 Market Street
St. Louis, MO 63103-2555
(314) 768-6200
November 13, 2014
Mr. Jack Sykes
Belgard Hardscapes
4201 Powell Drive
Bonner Springs, Kansas 66012
RE: Permeable Interlocking Concrete Pavement (PICP) - A Structural BMP
Dear Mr. Sykes,
The Metropolitan St. Louis Sewer District (MSD) has reviewed your application of the Aqua-
Bric, Aqua-BricLoc, Aqua-Bric Type 4, Aqua Roc, Drainstone, Eco-Brick, Eco Dublin, Eco-
Holland, Eco-Stone, Subterra Stone, Turfstone, and Aqualine Series and hereby grants these
products Provisional Use Level (PUL) approval as a PICP system. MSD understands that these
pavers enhance surface permeability by the open space created between the blocks, and are
recognized as a permeable pavement in satisfying MSD stormwater management requirements.
MSD has determined that the PICP may be used under the following conditions:
1. Proposed uses and designs of the paving units must be in general conformance with the
information and methodologies provided by Belgard Hardscapes. Uses and designs shall
also comply with the Interlocking Concrete Pavement Institute (ICPI) and MSD's
permeable pavement design and construction guidelines.
2. Channel Protection Volume (CPv) storage may be provided in the base stone and subbase
stone beneath the PICP and bedding layer.
3. The minimum pavement section subject to vehicular traffic shall be (from top to bottom)
3 1/8 inch thick paving units, 2-inch thick bedding stone (typically ASTM No. 8 or 9
stone), 4-inch thick layer of base stone (ASTM No. 57 or similar size), and a layer of
subbase stone (ASTM No. 2 or similar size), all underlain by MSD type 4 filter fabric.
The thickness of the subbase will vary depending on storage and anticipated traffic loads.
However, a minimum 12-inch thick subbase will be required for all applications.
4. The post -developed curve number (CN) for the footprint of the paving units may be
reduced. Reduced CN numbers are provided below.
Soil A B C D
CN 61 61 74 80
5. The PICP system will be considered as a pervious area for the purpose of calculating
Water Quality Volume (WQv) and 5 percent impervious when calculating the differential
runoff with PI factors. However, the PICP will be considered as a 100 percent impervious
area for the purpose of calculating pipe sizes downstream and when evaluating a site's
annual post developed runoff condition.
6. PICP may be considered as a stand-alone BMP in certain design instances. Those designs
are subject to MSD review and approval.
7. Project specific design calculations and maintenance plans 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 pavers do not satisfy MSD rules, requirements, or
construction and material specifications.
Sincerely,
Jason T. Peterein, P.E.
Principal Engineer (BMP Committee Chairman)
Engineering / Planning - Development Review
Metropolitan St. Louis Sewer District
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Commercial Collection
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Product Details
C.1,14•At RCAL
P1,471%
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COMmUICAL
OJEINESS PArtIONC ,IERICOITIAL ROAD
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Bug PARSING
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cOlLECTON
COLONUPSID. -FXTUPGA130
AQUALINE SERIESTM PERMEABLE PAVERS
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SAMPLE AQUALINE PATTERNS
A
BASKET WEAVE
HERRINGBONE
E
COURSED RUNNING BOND
BOX PATTERN 2
F
SPANISH BOND
BOX PATTERN 3
NATIONAL COLOR OFFERING
Rogionot Colon