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Midwest Block and Brick 2-17-17MSC Metropolitan St. Louis Sewer District 2350 Markel Street St. Louis, MO 63103-2555 (314) 768-6200 February 17, 2017 Mr. David Mudd Midwest Block & Brick 12901 St. Charles Rock Road Bridgeton, MO 63044 RE: Permeable Interlocking Concrete Pavement (PICP) - A Structural BMP Dear Mr. Mudd, The Metropolitan St. Louis Sewer District (MSD) has reviewed your application of Permeable Interlocking Concrete Pavement (PICP). Products covered by this letter are the Turfstone, Aqua- Bric, Uni-Eco-Stone, and Mission Paver. 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 previously under Kirchner Block and Brick and by Midwest Block and Brick. 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 ■ MIDWEST • BLOCK & BRICK VMANSTON EARD5C APE3• For more ideas visit: ervatitornanstone.coni Romanstone Permeable Paving Products 6ADDucr size IN INLNCS (O4 .1) UNITFINOT UNtTF M.LtU CQFTt6ALLUT WTr6.4.1t7 OUNCE Old Mission Paver Turfstone 80mm Sold by the peece. Aqua -Brie 80mm Type 1 Aqua -Brie 80mm Type 4 Aqua -Brit 80mm Type 4L Available on a special order basis. Designed for mechanical installation. Sold in full pallets only. Uni-Eco-Stone 80mm Anita* on a special order basis Sold in ful/pees only 3.15 x 15.7 x 23.6 0.39 40 103 2320 3.15x4.9x9.8 3.15x4.9x9.8 3.15 x 9.8 x 9.8 2.97 280 94 3360 2.97 1.93 3.15x4.5x9 3.51 320 91 3101 Mixedpab'et with three sizes per Layer. 6t9, 9x9, 9x 12. 8layers per p ltet (Sold by the pallet cvlayer only t nyei 42,52.5 SF) 100 3050 Avadit& in: Natural ATaiiabfe in: Terra Cotta Blend and Tirnberwood Blend Available in: Cedar Valley Blend and Ozark Blend @II MIDWEST BTOCKVIIRICK htivtiresidential.miovesthlockcomAr kiexphOocatit ns Locations Orr .ISol<s% TOLL FIFE PHONE FAX ARKANSAS Springdale ILLINOIS 1589 Electric Avenue, Springdale, Ali 72764-7351 (479) 750-7887 (479) 872-7580 Quincy 600 State Street, Quincy, IL 62301 (217) 223-2633 (217) 223-0335 Waterloo 8605 State Route 3, Waterloo, IL 62298 (618) 939-7600 (618) 939-7660 Paducah MISS011RI 1001 Estelle Sireet, Paducah, KY 42001 (270) 442-3585 (27O)) 442-3588 Bridgeton 12901 St. Charles Rock Road, Bridgeton, MO 63044 (314) 291-3200 (314) 291-0265 201 Rock Industrial Drive, Bridgeton, MO 63044 (314) 291-3200 (314) 298-3843 Cape Girardeau 2525 State Hwy 177, Cape Girardeau, MO 63701 (573) 334-1835 (573) 334-1834 Columbia 3115 Paris Road, Columbia, MO 65202 (573) 445-9484 (573) 445.9268 Jefferson City 2203 E. McCarty Street, Jefferson City, MO 65101 (573) 635-7119 (573) 635-2644 Kansas City 4101 East 12th Terrace, Kansas City, M0 64127 (816) 241-5197 (816) 241-5279 Osage Beach 6293 Osage Beach Railway, Osage Beach, MO 65065 (573) 348-1774 (573) 348-1775 Springfield 1650 East Atlarmc, Springfield, MO 65803 (417)869-2595 (417) 869-6052 Wentzville 15584 Veterans Memorial Parkway, Wentzville, MO 63385 (636) 332 9784 (636) 332 9792 OKLAHONIA Tulsa 1 5519 East 15th Street, Tulsa, OK 74112 TENNESSEE (918) 836-9151 (918) 836-2002 Oakland 1 2 0 Pierce Road, 0akland. TN 38060 Writer Ades (901) 465.6611 (901) 465-6605