The URL can be used to link to this page

Home My Public Portal AboutBelgard_PUL-PICP approval letter 11-13-14Metropolitan 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 -Brie 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 he 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 -StonnwaterManagement Facilities Report,:' prepared by the consulting Engineer. MSD reserves the ability to withdraw or modify this approval based can subsequent info atin, including information indicating that the pavers do not satisfy MSD rules, requirements, or construction and material specifications. Sincerely" Jason T. Peterein, RE. Principal Engineer MP Committee Charma Engineering / Planning - Development Review Metropolitan St. Louis Sewer District >a,0 , ead�«c az# ! ni> ! m » z a:A +R' • y < 1,1 ?<G ataJ1 lw. e« zdm: „ . e, « »= Ka»amts+=ecm+res It; W' rt ate 't n t AX .. Y ln 00000 • CPtA" NO YO,. OWN P AT= [ -4s Product Details ri 2,7A SA M L ,!ALINE P TTEgNS fa„2(€ 9w w;rT t#t, faDX BA T • EPN 2 P32.i., a A 'Y DES €5'44 4 F BOX PA,TF! VA151 *-22,20,22. ATA NATIONAL COLOR O GFERIN G 2.02(21,22.24fr "Fr J Rr1, 0.q 24#4 kzok.s