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333124Metropolitan St. Louis Sewer District 2350 Market Street St. Louis, MO 63103-2555 (314) 768-6200 July 15, 2009 Mark B. Joersz ADS/Hancor Inc. 4640 Trueman Blvd. Hilliard, OH 43026 RE: Renewed Approval for the ADS Water Quality Unit Dear Mr. Joersz, This letter is to advise you the Metropolitan St. Louis Sewer District has renewed the provisional use level approval to the ADS/Hancor Inc. — Water Quality Unit to provide Pretreatment for other offline BMP's in accordance with District requirements. This device will not be considered for pretreatment to online applications such as ponds. This device is provisionally approved only, and for all installations the project's design engineer must select the appropriate size unit based on the attached table and be specific to the water quality flow rate for that project. The initial installation of the ADS/Hancor Inc. — Water Quality Unit, within MSD's jurisdictional areas, shall include the following: 1) A manufacturer's or vendor's representative must be onsite during the proprietary BMP installation to ensure the product's installation requirements are met. 2) Shop drawings indicating elevations of flowlines, weirs, pipe inverts, etc. will be required prior to installation. 3) The manufacturer or vendor must arrange for an as -built survey of the proprietary BMP to be performed by a Missouri -registered Professional Land Surveyor once the device has been installed, and prior to any testing or monitoring. 4) The manufacturer or vendor must perform quarterly inspections of the proprietary BMP during its' first year of operation, which will include visual inspections and quantitative analysis of the service's sediment removal efficiency, especially as compared to its design efficiency. MSD requests to be invited to these inspections to further enhance familiarity and understanding of the device. 5) Formal reports shall be submitted to MSD, including as-builts and at each quarterly inspection. The reports shall include summaries, quantitative analysis mentioned in item 4, photographs of the structure, inlet, internal conditions of the structure, outfall conditions, etc. The reports shall also evaluate the performance of the owner's adherence to the approved maintenance program, and offer suggestions for any areas of improvement. Provisional use level approval is only granted for a period of one (1) year from the date of this letter. 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. If you have any questions, please do not hesitate to contact me at (314) 768- 2772. Sincerely, Michael T. Buechter, PE Principal Engineer Engineering/ Design pc: BMP Committee Water Quality Product Numbers Product Number Diameter Length Inlet Size Outlet Size Treated Flow Rate Sediment Volume Oil Volume Sieve in (mm) ft (mm) in (mm) in (mm) cfs (L/s) ft3 (m3) ft3 (m3) Size 3620WQA 36 (900) 20 (6) 10 (250) 10 (250) 1.5 (42) 65 (1.8) 30 (0.8) 140 3640WQA 36 (900) 40 (12) 10 (250) 10 (250) 2.38 (67) 137 (3.9) 63 (1.8) 140 3620WQB 36 (900) 20 (6) 10 (250) 10 (350) 0.7 (20) 65 (1.8) 30 (0.8) 200 3640WQB 36 (900) 40 (12) 10 (250) 10 (250) 1.6 (45) 137 (3.9) 63 (1.8) 200 4220WQA 42 (1050) 20 (6) 12 (300) 12 (300) 1.75 (49) 83 (2.3) 38 (1.1) 140 4240WQA 42 (1050) 40 (12) 12 (300) 12 (300) 3.66 (104) 175 (5.0) 81 (2.3) 140 4220WQB 42 (1050) 20 (6) 12 (300) 12 (300) 0.86 (24) 83 (2.3) 38 (1.1) 200 4240WQB 42 (1050) 40 (12) 12 (300) 12 (300) 1.83 (52) 175 (5.0) 81 (2.3) 200 4820WQA 48 (1200) 20 (6) 12 (300) 12 (300) 2.26 (64) 116 (3.3) 55 (1.6) 140 4840WQA 48 (1200) 40 (12) 12 (300) 12 (300) 3.94 (112) 245 (6.9) 115 (3.3) 140 4820WQB 48 (1200) 20 (6) 12 (300) 12 (300) 1.13 (32) 116 (3.3) 55 (1.6) 200 4840WQB 48 (1200) 40 (12) 12 (300) 12 (300) 2.39 (68) 245 (6.9) 115 (3.3) 200 6020WQA 60 (1500) 20 (6) 15 (375) 15 (375) 2.95 (84) 183 (5.2) 87 (2.5) 140 6040WQA 60 (1500) 40 (12) 15 (375) 15 (375) 6.23 (176) 385 (10.9) 184 (5.2) 140 6020WQB 60 (1500) 20 (6) 15 (375) 15 (375) 1.47 (42) 183 (5.2) 87 (2.5) 200 6040WQB 60 (1500) 40 (12) 15 (375) 15 (375) 3.12 (88) 385 (10.9) 184 (5.2) 200 *140 sieve is equal to a particle size of 0.0042" (106 microns) *200 sieve is equal to a particle size of 0.0030" ( 75 microns)