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460954etro oiiT :gin St. Louis Sewer istrict 2350 Market Street St, Louis, MO 63103-2555 (314) 768-6200 October 10, 2011 Mr. Michael Kimberlain KriStar Enterprises, Inc. 360 Sutton Place Santa Rosa, CA 95407 Fax (206) 338-5966 RE: Kristar F1oGard® Perk Filter Media Filtration Device General Use Level (GUL) Approval within District Dear Mr. Kimberlain, The Metropolitan St. Louis Sewer District (MSD) has reviewed your application regarding the Perk Filter for use as a Best Management Practice for stormwater management. MSD is pleased to provide General Use Level (GUL) approval for use of the Perk Filter as a stand-alone water quality BMP, subject to the following provisions. • The Perk Filter is approved for use on new development and redevelopment sites of any size. This approval is based on compliance with requirements listed in MSD's Proprietary Water Quality Products and the MSD's Stoiiuwater Management Program (Rev. Jan. 2009). Proprietary devices should be treated as a supplementary (rather than a primary) means of meeting small MS 4 requirements. • Proposed uses and designs of the device must be in general conformance with the information and methodologies provided in Kristar's application dated July 16, 2010, the addendum dated April 18, 2011, and the details provided October 7, 2011. • The use of buried filters shall be avoided on residential type projects. • The Perk Filter must be sized to capture all floatable trash and free oil, and remove 80% of the total suspended solids for the site Water Quality Volume (WQ,,). Procedures for calculating WQv are provided in Volume I of the Maryland Stormwater Design Manual (2000). All units shall be installed with adequate storage to treat 75% of the WQ,. • The Perk Filter cartridges shall be designed in accordance with the following parameters: Table 1: Perk Filter Cartridge Flow and Sediment Loads Stack Ht. (in) Flow (gpm) Mass Cap (lb) Flow (gpm) Mass Cap (lb) 12 6.8 37.7 12.0 21.4 18 10.2 56.6 18.0 32.1 24 13.6 75.4 24.0 42.7 30 17.0 94.3 30.0 53.4 • The device must be configured so that the filter vault is closed off from the outfall. All units including pretreatment should be configured in an off-line layout. • All units shall be installed with an "auxiliary flow control manifold" as indicated in the details provided October 7, 2011. The "auxiliary flow control manifold" shall be installed in such a manner as to prevent conflict with maintenance of the unit or removal or installation of the filter cartridges. • Adequate pretreatment shall be provided in all site designs in this case this will likely include Kristar FloGard© Dual -Vortex HDS unit. No reduction in the number of filter cartridges shall be made for the installation of pretreatment. The Dual -Vortex HDS shall be sized to remove 50% of the TSS (OK 110 PSD) at the water quality flowrate (WQf). • All proprietary lids and covers should be captive components. At least one "oversized" access shall be provided on the filter vault and storage chamber (each). The Neenah MH 1741-F1, cover, or equivalent, MSD approved cover is required. • Project specific design calculations and maintenance plans furnished by KriStar must be included within the project's "Stormwater Management Facilities Report" prepared by the consulting engineer. The devices maintenance plan shall be consistent with the plans presented in Kristar's application dated July 16, 2010, and addendum dated April 18, 2011. • The initial installation of the Perk Filter in the MSD 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) Upon construction approval of the initial installation of this device the manufacturer shall prepare and submit a QAPP (Quality Assurance Performance Plan) to the BMP committee for review. At a minimum the QAPP shall address: 4a)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. 4b)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, the filters, and 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. 5) Upon approval of the QAPP, the manufacturer shall carry out the plan. 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. Sincerely, Jason T. Peterein, P.E. Civil Engineer (BMP Committee Chairman) Engineering/Planning Metropolitan St. Louis Sewer District Attachements: Concrete Vault Details (3 sheets) PF-V-4-SL 0001 BOLTED & GASKETED ACCESS HATCH. SIZE, QUANTITY & PLACEMENT AS REQUIRED. SEE NOTE 2. 024.00" — BOLTED & GASKETED ACCESS COVER. SEE NOTE 2. 018" MAXIMUM." SEE NOTE 3. Notes: 1. 2. FILTERED DRAIN DOWN DEVICE. SEE NOTE 4, INLET GALLERY. - St. Louis Metropolitan Sewer District General Use Level * VENT HOSES MOUNTED WITH CLIPS 1,00" FROM CEILING OF VAULT. - VENTED OUTLET HOOD. 018" MAXIMUM. SEE NOTE 3. AUXILIARY FLOW CONTROL MANIFOLD. BASE SECTION. PERK FILTER'" CARTRIDGES/STACKS WITH AUXILIARY FLOW CONTROL MANIFOLD. '------CONCRETE FALSE FLOOR. OUTLET CHAMBER. CONCRETE DIVIDER WALL. -- 2X 04.00" INLET FEED—THRU CAST INTO DIVIDER WALL. INLET/FLOATABLES WEIR. Precast concrete structure shall be manufactured in accordance with ASTM Designation C857 and C858. Filter system shall be supplied with traffic rated (H20) bolted & gasketed access covers. At least one "oversized" access shall be provided for the media bay and the pre-treatment bay. (Minimum 2 each total per vault.) Field Poured concrete collar as required, by others. 3. Inlet & outlet pipe(s) (0 18" maximum) may enter device on all three sides of the inlet & outlet chambers respectively. Connections to be made with compression gasket fittings. For pipe sizes greater than 0 18", contact Kristar Enterprises for engineering assistance. 4. Inlet chamber shall be supplied with drain down device, designed to remove standing water between storm events. 5. Perk -Filter systems may be supplied with individual or multiple 18" or 12" high Perk -Filter cartridge. Filter cartridge may be stacked to accommodate higher flow rates. 6. For depths less than specified minimums contact Kristar Enterprises for engineering assistance. * Treatment Flow Rates & Mass Capacities shown conform to St. Louis Metropolitan Sewer District General Use Level. TITLE ® Perk Filter TM 4' WIDE CONCRETE VAULT (St. Louis Metropolitan Sewer District Configuration) THREE TO SEVEN CARTRIDGES / STACKS KR,S KriStar Enterprises, Inc. 360 Sutton Place, Santa Rosa, CA 95407 Ph 800.579.8819. Fax: 707.524.8186, www.kristar.com DRAWING NO P F-V-4-S L-0001 REV NR Eco 0096 NEW 9/20/11 GATE JPR 9/20/11 PF-V-6-Si0001 BOLTED & GASKETED ACCESS HATCH.- - SIZE, QUANTITY & PLACEMENT AS REQUIRED. SEE NOTE 2. TOP SLAB. - BASE. 024" MAXIMUM. SEE NOTE 3. Notes: 1. 2. FILTERED DRAIN DOWN DEVICE. SEE NOTE 4. INLET GALLERY. / St. Louis Metropolitan Sewer District General Use Level * VENTED OUTLET HOOD. VENT HOSES MOUNTED WITH CLIPS 1.00" FROM CEILING OF VAULT. — 024" MAXIMUM. SEE NOTE 3, AUXILIARY FLOW CONTROL MANIFOLD. - - BASE SECTION. -- PERK FILTER- CARTRIDGES/STACKS WITH AUXILIARY FLOW CONTROL. CONCRETE FALSE FLOOR. OUTLET CHAMBER. -- CONCRETE DIVIDER WALL. 4X 04.00" INLET FEED—THRU CAST INTO DIVIDER WALL. 2X INLET/FLOATABLES WEIR. Precast concrete structure shall be manufactured in accordance with ASTM Designation C857 and C858. Filter system shall be supplied with traffic rated (H20) bolted & gasketed access covers. At least one "oversized" access shall be provided for the media bay and the pre-treatment bay. (Minimum 2 each total per vault.) Field Poured concrete collar as required, by others. 3. Inlet & outlet pipe(s) (0 24" maximum) may enter device on all three sides of the inlet & outlet chambers respectively. Connections to be made with compression gasket fittings. For pipe sizes greater than 0 24", contact Kristar Enterprises for engineering assistance. 4. Inlet chamber shall be supplied with drain down device, designed to remove standing water between storm events. 5. Perk -Filter systems may be supplied with individual or multiple 18" or 12" high Perk -Filter cartridge. Filter cartridge may be stacked to accommodate higher flow rates. 6. For depths less than specified minimums contact Kristar Enterprises for engineering assistance. * Treatment Flow Rates & Mass Capacities shown conform to St. Louis Metropolitan Sewer District General Use Level. TITLE ; ® Perk Filter TM 6' WIDE CONCRETE VAULT (St. Louis Metropolitan Sewer District Configuration) FOUR TO ELEVEN CARTRIDGES / STACKS KriStar Enterprises, Inc. 360 Sutton Place, Santa Rosa, CA 95407 Ph. 800.579.8819, Fax: 707.524.8186, www.kristar.com DRAWING NO. PF-V-6-SL-0001 REV NR EC C 0096 NEW 9/20/11 DATE JPR 9/20/11 PF-V-8 SL-0001 BOLTED & GASKETED ACCESS HATCH. -- SCE, QUANTITY & PLACEMENT AS REQUIRED. SEE NOTE 2. TOP SLAB. BASE. 024" MAXIMUM. SEE NOTE 3. FILTERED DRAIN DOWN -- DEVICE. SEE NOTE 4. Notes: 1. 2. INLET GALLERY. St. Louis Metropolitan Sewer District General Use Level * VENT HOSES MOUNTED WITH CLIPS %' 1.00" FROM CEILING OF VAULT. - VENTED OUTLET HOOD. - - TOP SLAB. 024" MAXIMUM. SEE NOTE 3. AUXILIARY FLOW CONTROL MANIFOLD. BASE SECTION. PERK FILTER"' CARTRIDGES/STACKS WITH AUXILIARY FLOW CONTROL. - CONCRETE FALSE FLOOR. OUTLET CHAMBER. CONCRETE DIVIDER WALL. 6X 04.00" INLET FEED-THRU CAST INTO DIVIDER WALL. 3X INLET/FLOATABLES WEIR. Precast concrete structure shall be manufactured in accordance with ASTM Designation C857 and C858. Filter system shall be supplied with traffic rated (H20) bolted & gasketed access covers. At least one "oversized" access shall be provided for the media bay and the pre-treatment bay. (Minimum 2 each total per vault.) Field Poured concrete collar as required, by others. 3. Inlet & outlet pipe(s) (0 24" maximum) may enter device on all three sides of the inlet & outlet chambers respectively. Connections to be made with compression gasket fittings. For pipe sizes greater than 0 24", contact Kristar Enterprises for engineering assistance. 4. Inlet chamber shall be supplied with drain down device, designed to remove standing water between storm events. 5. Perk -Filter systems may be supplied with individual or multiple 18" or 12" high Perk -Filter cartridge. Filter cartridge may be stacked to accommodate higher flow rates. 6. For depths less than specified minimums contact Kristar Enterprises for engineering assistance. * Treatment Flow Rates & Mass Capacities shown conform to St. Louis Metropolitan Sewer District General Use Level. TITLE ® Perk Filter TM 8' WIDE CONCRETE VAULT (St. Louis Metropolitan Sewer District Configuration) SIX TO THIRTY ONE CARTRIDGES / STACKS KriStar Enterprises, Inc. 360 Sutton Place, Santa Rosa, CA 95407 Ph. 800.579.8819, Fax: 707.524.8186, www.kristar.com DRAWING NO. PF-V-8-SL-0001 REV NR ECO 0096 NEW 9/20/11 NEE JPR 9/20/11