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Home My WebLink AboutO&M Manual 08-29-19 Stormwater Operation and Maintenance Manual For Indianapolis Rehabilitation Institute Pennsylvania Street and City Center Drive Carmel, IN 46033 Prepared For: WB Development Partners, 4441 W Airport Freeway, Suite 330 Irving, Tx 75062 Prepared By: American Structurepoint, Inc. 7260 Shadeland Station Indianapolis, Indiana 46256 (317) 547-5580 Submitted by: Joshua H. Cribelar, PE Nathan Horgan Submitted: April 17, 2019 Revised: May 29, 2019 Revised: September 12, 2019 TABLE OF CONTENTS OWNER ACKNOWLEDGMENT AGREEMENT (“AGREEMENT”) SECTION I Owner Information SECTION II Site Information SECTION III Storm Structure Maintenance SECTION IV Conveyance Maintenance (Stormsewer) SECTION V Conveyance Maintenance (Swales) SECTION VI Wet Pond with Native Banks and Aerator SECTION VII Aqua-Swirl System SECTION VIII Inspection and Maintenance Schedule SECTION IX Utility Plan and Details SECTION X Inspection Checklist Forms O&M Manual Indianapolis Rehabilitation Institute Pennsylvania Street and City Center Drive Carmel, IN 46033 BMP Owner Name WB Development Partners, 4441 W Airport Freeway, Suite 330 Irving, Tx 75062 Representative: Alex Bennett Business Phone: (214) 699-5137 E-mail: abennett@wbdevpartners.com General Information The purpose of water quality Best Management Practices is to filter the first flush of rainwater before it enters the downstream lakes and streams. Through the use of these Best Management Practices, the sediment and pollutant load in stormwater runoff is reduced, and in many cases the quantity of stormwater water runoff generated is also reduced. The use of Best Management Practices also helps to reduce hydrocarbons, trash and debris from entering waterways. Owner Responsibility The BMP Owner shall be responsible for all maintenance and costs associated with the proposed BMPs. In addition, it is the owner’s responsibility to perform and/or pay for inspections and maintenance as recommended below. Right of Entry City of Carmel representatives have the right to enter the property to inspect and, if required, maintain the BMPs at any time. Annual Inspection Reports Annual inspection reports shall be submitted to City of Carmel for each BMP. The first report is due one year after construction is completed, with subsequent reports due each year within the same month of the initial report. If there are any deficiencies found during the inspection, these should be addressed. If the inspection report is not received within the month it is due, if there are deficiencies which were not included in the report, or if any deficiencies included in the report are not addressed in a timely manner, the BMP owner faces enforcement action from City of Carmel. SECTION I OWNER INFORMATION OWNER INFORMATION: WB Development Partners, 4441 W Airport Freeway, Suite 330 Irving, Tx 75062 Representative: Alex Bennett Business Phone: (214) 699-5137 E-mail: abennett@wbdevpartners.com OWNER RESPONSIBILITY: The Owner is responsible for all maintenance, including cost, associated with inspecting and maintaining the infrastructure included within this manual. SECTION II SITE INFORMATION The site contains one Best Management Practice (BMP) for the purpose of sediment removal. This BMP is an Aqua-Swirl AS-9 Unit. The Aqua-Swirl is located north of the proposed outlet into the Wet Detention Pond. The Wet Detention Pond is also a BMP however it is located on the neighboring property, adjacent to the southern border of the site. See the attached site exhibits for BMP and storm sewer locations. City of Carmel will require annual inspection reports of the water quality BMPs. SECTION III STORM STRUCTURE MAINTENANCE Storm structures are set at storm sewer pipe connections. Unless you have OSHA approved training and equipment, never enter a manhole. Inspection All inlet castings should be inspected monthly and after each rainfall event. More frequent inspections should be performed in areas where there is higher potential for trash or litter (e.g. retail establishments) and during the fall when leaves are present on the ground. Check the frame and lid for cracks and wear, such as rocking lids or lids moved by traffic. Storm structures and the surrounding areas should be inspected annually for pollutants such as leaks from dumpsters, minor spills, and oil dumping. Take action to have the pollutant source removed. Cleaning Clean structures when there is a blockage of a water flow path or when sediment depth reaches 6”. Cleaning should be performed in a way that ensures removed sediment and water is not discharged back into the storm sewer. Safety Work inside underground structures requires special OSHA-required confined space equipment and procedures. The most practical option may be to contract with a sewer cleaning contractor. Materials Handling Disposal of waste from maintenance of drainage facilities shall be conducted in accordance with federal, state, and local regulations. Removed sediment must be disposed in the garbage as solid waste. Water should be disposed of in a sanitary sewer after oils are removed using oil absorbent materials or other mechanical means. Used oil absorbents should be recycled or disposed according to the manufacturer's instructions. Repairs Repair all security and access features so they are fully functional. This includes locking lids, covers, and ladder rungs. Replace broken parts or lids that rock or are moved by traffic. SECTION IV CONVEYANCE MAINTENANCE (STORMSEWER) Storm sewer pipes convey stormwater. Pipes are built from many materials and are sometimes perforated to allow stormwater to infiltrate into the ground. Storm pipes are cleaned to remove sediment or blockages when problems are identified. Storm pipes must be clear of obstructions and breaks to prevent localized flooding. Inspection Pipes are difficult to inspect requiring special equipment and training. Usually, if a problem occurs the owner needs to call a sewer or plumbing contractor to inspect, repair or clean pipelines. Cleaning Clean pipes when sediment depth is greater than ¼ of pipe diameter, with a maximum sediment depth of 6”. When cleaning a pipe, minimize sediment and debris discharges from pipes to the storm sewer. Install downstream debris traps (where applicable) before cleaning and then remove material. Generally, use mechanical methods to remove root obstructions from inside storm sewer pipes. Do not put root-dissolving chemicals in storm sewer pipes. If there is a problem, remove the vegetation over the line. Safety Work inside underground structures requires special OSHA-required confined space equipment and procedures. The most practical option may be to contract with a sewer--cleaning contractor. Materials Handling Sediment and debris from pipes should be disposed in the garbage as solid waste. Pick out any rocks first. Repairs Repair or replace pipes when a dent or break closes more than 20 percent of the pipe diameter. Repair or replace pipes damaged by deterioration. SECTION V CONVEYANCE MAINTENANCE (SWALES) Swales are manmade open channels that carry only stormwater. Ditches are often maintained for drainage to prevent localized flooding by draining stormwater. Maintenance includes removing sediment, debris and overgrown vegetation. Inspection Inspect swales during routine site maintenance or at least once per year. Cleaning Clear inlets and outlets to prevent blockage. Remove litter when mowing or litter accumulation that exceeds one cubic foot. Use rake and shovel to hand remove sediment accumulations greater than 2” in depth that cover grass areas, avoiding vegetation removal. A good time to clean swales is during the growing season, when it easiest to reestablish vegetation. This is generally April through June and September through October. Vegetation Management Mow to keep grass at the optimum height (6”). Mow to no less than 4” and a minimum of four cuttings per year. Remove clippings from the treatment area in the base of the swale. Preserve healthy vegetation or reestablish vegetation where needed. Seed bare spots. Use cover BMPs on bare soils. BMPs include hydroseeding or mulches. Trees and shrubbery should be allowed to grow unless they interfere with the facility function or maintenance activities. Repairs Often swales have problems due to flooding or erosion. Where possible, correct the underlying problem before trying to repair the symptom. If there is a problem with grass dying due to the swale being flooded during the wet season, there are two options: convert the swale to plant varieties that can stand being flooded or find a way to fix the swale so it drains. SECTION VI WET POND WITH NATIVE BANKS AND AERATOR The site utilizes a wet-detention systems on the neighboring southern property. Detention facilities are designed to hold and slowly release stormwater by use of a pond and a specially designed control structure. Inspection Inspect the facility for oil and other pollutants and remove any pollutants greater in volume than a surface sheen. Inspect sediment sump if present. Identify and report pollutant sources to the facility. Inspect vegetation and perform maintenance activities if necessary. Review construction plans for any original planting plan. Cleaning Remove trash and sediment as necessary. Materials Handling Disposal of waste from maintenance of drainage facilities shall be conducted in accordance with federal, state, and local regulations. Removed sediment must be disposed in the garbage as solid waste. Repairs Repair and seed bare areas. Repair eroded slopes when rills form, where the cause of damage is present, or there is the potential for future erosion. If berms or dams show signs of settlement or sinkholes, serious problems may be occurring. Spillway areas should be completely covered by established vegetation. LONG TERM MAINTENANCE OF NATIVE PLANTINGS Seeded lake edge community, plugs at water line. YEAR ONE: · Maintain and water fowl fencing that is in place until plugs, if present, have rooted in. Remove after the second growing season. · Ensure lawn is established prior to installing native seed and plugs. This will minimize runoff of fertilizers and erosion. · Maintain erosion control blanked on any seeded areas until established. · Remove monthly invasive species, especially Canadian Thistle, Queen Anne’s Lace, and Sweet Clover · If weed growth exceeds 10”, mow to a height of 4”. Do not cut any vegetation established at or below the water line. · Ensure seeded areas and plugs receive 1” of water per week for the first 8 weeks. YEAR TWO: · At the beginning of the growing season (late spring), mow if weed growth exceeds 20 percent of the plantings. Mow to a height of 4”. · Remove invasive species, especially Canadian Thistle, Queen Anne’s Lace, and Sweet Clover FUTURE YEARS · Watch for weed growth and remove an seeded · Mow in early spring to keep woody plant species at bay. Remove clippings to avoid excess mulch. DO NOT USE THE FOLLOWING ITEMS IN NATIVE PLANTINGS UNLESS DIRECTED BY A NATIVE PLANTS EXPERT. · Fertilizer · General Herbicide sprays/weed killer CONTACT KEVIN TUNGESVICK WITH SPENCE RESTORATION NURSEY FOR SPECIFIC ISSUES OR QUESTIONS. 765-286-7154 SECTION VII AQUA-SWIRL SYSTEM The site contains one AS-9 Aqua-Swirl unit directly upstream of the outlet into the wet detention facility. Swirl concentrators are designed to remove sediment, debris, and free oil from entering the sewer system. After construction the swirl concentrator should be inspected every six months and cleaned as needed or once a year regardless of whether it has reached full pollutant storage capacity. Disposal of all sediment, in addition to local requirements, must be in accordance with all federal and state requirements. See the attached O&M Manual for the swirl concentrator for complete details of inspection and cleaning. Inspection Inspect the unit every six months. The inspection should determine sediment depth, accumulation of trash and litter, and the specific maintenance and repairs needed. Annually check for cracks large enough to let soil enter the vault, broken or defective plates and baffles, and crushed or damaged pipes. Cleaning Remove trash and litter from the vault, inlet and piping when present. Remove sediment when it accumulates to the manufacturer’s maximum recommended depth. Cleaning should be performed in a way that ensures removed sediment and water is not discharged back into the storm sewer. Safety Work inside underground structures requires special OSHA-required confined space equipment and procedures Materials Handling Disposal of waste from maintenance of drainage facilities shall be conducted in accordance with federal, state, and local regulations. Removed sediment must be disposed in the garbage as solid waste. Water should be disposed of in a sanitary sewer after oils are removed using oil absorbent materials or other mechanical means. Used oil absorbents should be recycled or disposed according to the manufacturer's instructions. Repairs Repair any cracked or defective plates or baffles. Repair all security and access features so they are fully functional. This includes locking lids, covers, and ladder rungs. Replace broken parts or lids that rock or are moved by traffic. SECTION VIII INSPECTION AND MAINTENANCE SCHEDULE Structure/Unit Inspection Maintenance Storm Structure Maintenance Monthly & after rain events Accumulate 6” of sediment Conveyance Maintenance (Storm Sewer) When problems occur Accumulate 6” of sediment Conveyance Maintenance (Swales) Wet Detention System Every 6 months When trash and litter are present Aqua-Swirl Every 6 months Per manufacturers designated depth SECTION IX UTILITY PLAN AND DETAILS PLOT DATE: 9/12/2019 11:28 AMPLOT SCALE: 1:2.5849 EDIT DATE: 8/30/2019 EDITED BY: NHORGAN DRAWING FILE: P:\2018\02759\D. Drawings\Civil\Construction Documents\2018.02759.CE.C600.SD.dwg 9025 River Road, Suite 200 | Indianapolis, Indiana 46240TEL 317.547.5580 | FAX 317.543.0270www.structurepoint.comProject NumberCERTIFIED BYISSUANCE INDEXDATE:PROJECT PHASE:REVISION SCHEDULENO.DESCRIPTIONDATE04/17/2019DP/ADLS2018.02759INDIANAPOLISREHABILITATIONHOSPITAL1260 CITY CENTER DRIVECARMEL, INDIANA 46032WB DEVELOPMENT PARTNERS4441 W AIRPORT FREEWAYSUITE 330IRVING, TEXAS 75062PHONE: (214) 699-5137C600SITE DETAILS ™ Phone (888) 344-9044 Fax (423) 826-21122733 Kanasita Drive, Suite 111, Chattanooga, TN 37343STORMWATER TREATMENT SOLUTIONS www.aquashieldinc.comAqua-Swirl Concentrator Model AS-9 BYP PCS Standard DetailAS-9 PCS STD01/20/15Scale:Drawn By:Document:Date:JCW1:30U.S. Patent No. 6524473 and other Patent Pending5 3/8" [137 mm]5/8" [15 mm]1 3/16" [30 mm]Manhole Frame & Cover DetailNTSFor Non-Traffic Areas OnlySoil1 3/16" [30 mm]Unless other traffic barriers are present,bollards shall be placed around access riser(s)in non-traffic areas to prevent inadvertentloading by maintenance vehicles.SoilPlace small amount ofconcrete [3,000 psi [20MPa] (min)] to supportand level manhole frame.DO NOT allow manholeframe to rest upon riser.RiserFrameCover57 5/8" [1463 mm] Min.14 3/8" [366 mm]Wrap Compressible ExpansionJoint Material to a minimum1-inch [25 mm] thickness aroundtop of riser to allow transfer ofinadvertent loading frommanhole cover to concrete slab.Backfill (90%Proctor Density)ConcreteConcrete9 5/8" [244 mm]Gravel BackfillGravel Backfill5 3/8"CoverFrame1" [25 mm] ThickExpansion JointMaterial30" [762 mm]Riser#4 [13 mm] Rebar@ 6" [152 mm]Each Way16 13/16"5/8"3,000 psi [20 MPa](min) ConcreteManhole Frame & Cover DetailFor Traffic Loading AreasNTSIf traffic loading (HS-25) is required or anticipated, a 4-foot [1.22 m]diameter, 14-inch [356 mm] thick reinforced concrete pad must beplaced over the Stormwater Treatment System Riser to support andlevel the manhole frame, as shown. The top of riser pipe must bewrapped with compressible expansion joint material to a minimum1-inch [25 mm] thickness to allow transfer of wheel loads frommanhole cover to concrete slab. Manhole cover shall bear on concreteslab and not on riser pipe. The concrete slab shall have a minimumstrength of 3,000 psi [20 MPa] and be reinforced with #4 [13 mm]reinforcing steel as shown. Minimum cover over reinforcing steel shallbe 1-inch [25 mm]. Top of manhole cover and concrete slab shall belevel with finish grade.Backfill (90%Proctor Density)57 5/8"InternalBafflesSlide riser over top ringand bolt in 4 placesRiser114"[2896 mm]to128" [3251 mm]Swirl Inlet/OutletGrade (Rim)30" [762 mm]Rim elevations to match finishedgrade.Manhole Frame andCover by Manufacturer.(See Details)VariesVaries68"[1727 mm]STORMWATER TREATMENT SOLUTIONSPhone (888) 344-9044 www.aquashieldinc.com™Backfill shall extend at least 18inches [457 mm] outward fromSwirl Concentrator and for thefull height of the SwirlConcentrator (including riser)extending laterally toundisturbed soils. (See MHDetail Below)BeddingUndisturbed SoilBackfill6" [152 mm]18" [457 mm]Section A-APlan ViewOutletAInternal BafflesOctagonal Base PlatePipe couplingby Contractor.12" [305 mm]long Stub-outby Manufacturer.Ø108" [Ø2743 mm]5" [127 mm] MH Frame120"[3048 mm]120"[3048 mm]Aqua-Swirl Polymer Coated Steel (PCS)Stormwater Treatment System48"[1219 mm] PCS Max***InletA* Please see accompanied Aqua-Swirl specification notes.* See Site Plan for actual system orientation.** Orientation may vary from 90°, 180°, or custom angles to meet site conditions.***See Representative for larger pipe diameters available.Note: As an alternative, 42-inch OD, HS-20/25rated precast concrete rings may be substituted.14-inch thickness must be maintained.180°**PLOT DATE: 9/12/2019 11:29 AMPLOT SCALE: 1:2.5849 EDIT DATE: 8/30/2019 EDITED BY: NHORGAN DRAWING FILE: P:\2018\02759\D. Drawings\Civil\Construction Documents\2018.02759.CE.C600.SD.dwg 9025 River Road, Suite 200 | Indianapolis, Indiana 46240TEL 317.547.5580 | FAX 317.543.0270www.structurepoint.comProject NumberCERTIFIED BYISSUANCE INDEXDATE:PROJECT PHASE:REVISION SCHEDULENO.DESCRIPTIONDATE04/17/2019DP/ADLS2018.02759INDIANAPOLISREHABILITATIONHOSPITAL1260 CITY CENTER DRIVECARMEL, INDIANA 46032WB DEVELOPMENT PARTNERS4441 W AIRPORT FREEWAYSUITE 330IRVING, TEXAS 75062PHONE: (214) 699-5137C601SITE DETAILS PLOT DATE: 9/12/2019 11:29 AMPLOT SCALE: 1:2.5849 EDIT DATE: 8/30/2019 EDITED BY: NHORGAN DRAWING FILE: P:\2018\02759\D. Drawings\Civil\Construction Documents\2018.02759.CE.C600.SD.dwg 9025 River Road, Suite 200 | Indianapolis, Indiana 46240TEL 317.547.5580 | FAX 317.543.0270www.structurepoint.comProject NumberCERTIFIED BYISSUANCE INDEXDATE:PROJECT PHASE:REVISION SCHEDULENO.DESCRIPTIONDATE04/17/2019DP/ADLS2018.02759INDIANAPOLISREHABILITATIONHOSPITAL1260 CITY CENTER DRIVECARMEL, INDIANA 46032WB DEVELOPMENT PARTNERS4441 W AIRPORT FREEWAYSUITE 330IRVING, TEXAS 75062PHONE: (214) 699-5137C605SITE DETAILS SECTION X INSPECTION CHECKLIST FORMS Project:Owner Change since last inspection?Y N Owner Name, Address, Phone: Number: Location: Site Status Date: Time: Inspector: Additional Comments: Actions to be taken:Timeframe: 1. Trash/Debris obstructing inflow 3. Other (describe) Affected Pipes: 2. Silt/Sediment accumulation Affected Pipes: Maintenance Item Satisfactory/ Unsatisfactory Comments Storm sewer pipes (Inspect annually and after major storms) Storm Sewer Pipes Operation, Maintenance, and Management Inspection Checklist for BMP Owners Project:Owner Change since last inspection?Y N Owner Name, Address, Phone: Number: Location: Site Status Date: Time: Inspector: Headwall Structures (Inspect annually and after major storms) Additional Comments: Actions to be taken:Timeframe: 6. Other (describe) Affected Structures: 3. Animal burrows 4. Headwall clear of obstructions 1. Sediment/Debris in sump 3. Other (describe) 5. Sediement Accumulation Affected Structures: 1. Vegetation around headwall 2. Erosion around headwall Structure Sump (Inspect annually and after major storms) Affected Structures: 2. Silt/Sediment accumulation Affected Structures: 3. Other (describe) 1. Trash/Debris obstructing inflow Maintenance Item Satisfactory/ Unsatisfactory Comments Structure Casting and Grate (Inspect annually and after major storms) Storm Sewer Structure Operation, Maintenance, and Management Inspection Checklist for BMP Owners Aqua-SwirlTM O and M Manual Page 1 Site Name:Change in ownership since last inspection?Y N Owner Name: Owner Address: Owner Phone Number: Emergency Phone Number: Location: Date: Time: Inspector Name: Floatable Debris and Oil 1. Remove manhole lid to expose liquid surface of Aqua-SwirlTM. 2. Remove floatable debris with basket or net if any is present. 3. If a hydrocarbon spill has occurred, (e.g. more than a sheen of oil or gas is present) the system should be cleaned immediately (see "Cleaning" Figure 3). Note: Water in an Aqua-SwirlTM can appear black like oil due to the dark body of the surrounding structure. Oil appears darker than water in the system and is usually accompanied by debris (e.g. Styrofoam, etc.) with obvious signs of oil stains. The depth of oil can be measured with an oil/water interface probe, a stadia rod with water phylic paste, a coliwasa, or by simply collecting a representative sample with a jar attached to a rod. 4. If hydrocarbon absorbant floc or pads are used, these should be inspected to determine whether they are loaded with hydrocarbons. This will be indicated by a dark colaration of the pad or floc. Pads and/or floc should be removed and disposed of in accordance with City of Indianapolis, and any applicable state and/or federal laws if they contain hydrocarbons. Sediment Accumulation Lower a dipstick tube equipped with a ball valve (e.g. Sludge Judge or similar device) into Aqua-SwirlTM through the service access provided. Measure the depth of the sludge. At a maximum, the sludge should not exceed 36" depth before maintenance. See Figures 1 and 2. 36" Figure 1 Figure 2 City of Indianapolis, Indiana Aqua-Swirl TM Inspection Maintenance Items Operation, Maintenance, and Inspection Manual for BMP Owners (Note: Attach certifications for local regulatory authority including any applicable fees.) Site and Owner Information Aqua-SwirlTM O and M Manual Page 2 Diversion Structures If an external diversion structure is present on the site, this should be inspected for the following items. 1. Inspect weir or other structure for structural decay or damage. Weirs are more susceptible to damage than off-set piping and should be checked to confirm that they are not crumbling or decaying. 2. Inspect diversion structure and by-pass piping for signs of structural damage or blockage from debris or sediment accumulation. 3. Measure elevations on diversion weir or piping to ensure it is consistent with site plan design. 4. Inspect downstream structure in diversion system for signs of blockage or structural failure. ENTEL, Inc. (734-657-3839) provides inspection and maintenance services for AquaSwirls in central Indiana. Remove sediments, oils and other floatable pollutants with a vactor. Dispose of all waste in accordance with City of Indianapolis and any applicable state, and/or federal requirements. Oil should be pumped and removed with any liquids and sediments that have been trapped in the system. These liquids should be taken to an industrial waste water treatment facility for treatment. Liquids and solids pumped from the AquaSwirlTM should not be dumped back into the stormwater system or into a sanitary sewer. Figure 3 Note: The AquaSwirlTM is designed so that entry to the system is not necessary for inspection or maintenance. If, however, you wish to enter the system, this is an OSHA confined space entry and OSHA confined space entry procedures should be followed to enter the system. During Construction Inspect the AquaSwirlTM every three months (minimum) and clean the system as needed. The AquaSwirlTM should be inspected and cleaned at the end of construction regardless of whether it has reached its sediment or oil storage capacity. First Year Post-Construction Inspect the AquaSwirlTM every three months and clean the system as needed. Inspect and clean the system once annually regardless of whether it has reached its sediment or floatable pollutant storage capacity. Second and Subsequent Years Post-Construction If the AquaSwirlTM did not reach full sediment or floatable pollutant capacity in the First Year Post-Construction, the system can be inspected once every six months and cleaned once annually. If the AquaSwirlTM reached full sediment or floatable pollutant capacity in less than 12 months in the First Year Post-Construction, the system should be inspected once every six months and cleaned as needed. The AquaSwirlTM should be cleaned annually regardless of whether it reaches its sediment or floatable pollutant capacity. Bypass Structures Bypass structures should be inspected whenever the AquaSwirlTM is inspected and maintained as needed. Cleaning Inspection (continued) Maintenance Schedule Aqua-SwirlTM O and M Manual Page 3 Company Name: Street Address: City, State, Zip: Contact: Office Phone: Mobile Phone: Pager: Date of cleaning:(Next inspection should be 3 months from this date for the first year). Time of cleaning: Date of next inspection: Floatable debris present (Y/N)? Oil present (Y/N)?Oil depth (inches): Any structural damage?Y N Where? Any evidence of structural wear?Y N Where? Odors present?Y N Describe: Any plugging?Y N Describe: Maintenance Company Information Activity Log Structural Conditions and Comments Aqua-SwirlTM O and M Manual Page 4 Additional Comments and/or Actions to Be Taken Time Frame NOTES: 1. Attach site plan showing Aqua-SwirlTM location. 2. Attach detail drawing showing Aqua-SwirlTM dimensions and model number. 3. If a diversion structure is used, attached details showing basic design and elevations. NOTES Aqua-SwirlTM O and M Manual Page 5 Date Construction Started: Date Construction Ended: Activity 1 2 3 4 5 6 7 8 9 10 11 12 Inspect and Clean as Needed X X X X Inspect Bypass Structures X X X X (if applicable) and Maintain As Needed Clean System*X* * The AquaSwirlTM should be cleaned once a year regardless of whether it has reached full pollutant storage capacity. In addition, the system should be cleaned at the end of construction regardless of whether it has reach full pollutant storage capacity. Activity 1 2 3 4 5 6 7 8 9 10 11 12 Inspect and Clean as Needed X X X X Inspect Bypass Structures X X X X (if applicable) and Maintain As Needed Clean System*X* * The AquaSwirlTM should be cleaned once a year regardless of whether it has reached full pollutant storage capacity. Activity 1 2 3 4 5 6 7 8 9 10 11 12 Inspect and Clean as Needed*X X Inspect Bypass Structures*X X (if applicable) and Maintain As Needed Clean System*X X *If the AquaSwirlTM did not reach full sediment or floatable pollutant capacity in the First Year Post-Construction, the system can be inspected every six months and cleaned once annually. If the AquaSwirlTM reached full sediment or floatable pollutant capacity in less than 12 months in the First Year Post-Construction, the system should be inspected as frequently as past history warrants (once every six months minimum) and cleaned as needed. The AquaSwirlTM should be cleaned annually regardless of whether it reaches its sediment or floatable pollutant capacity. External bypass structures, if present, should be inspected whenever the AquaSwirlTM is inspected and maintained as needed. Second and Subsequent Years Post-Construction Month During Construction Month First Year Post-Construction Month Aqua-Swirl TM TABULAR MAINTENANCE SCHEDULE