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HomeMy WebLinkAboutO&M Manual OPERATIONS AND MAINTENANCE MANUAL FOR BMP OF 4810 Northwestern Drive City of Carmel Hamilton County Prepared: January 3, 2022 Prepared by: Charlie Mattox CrossRoad Engineers, P.C. 3417 Sherman Drive Beech Grove, IN 46107 phone: (317) 780-1555 fax: (317) 780-6525 email: info@crossroadengineers.com 2 BMP Owner/Contact Information Robert Wilson RE Wilson, LLC 235 Wakefield Way Zionsville, IN 46077 BMP Location and Description The BMP is located west of the parking area on the 4810 Northwestern Drive property. The subject parcel is Lot 8 of the overall Park Northwestern Subdivision in Zionsville, Indiana (Carmel planning jurisdiction). Refer to Appendix A for the Vicinity map. The BMP being utilized in this project is one (1) Aquaswirl to treat and reduce the suspended solids and pollutants in stormwater runoff. The unit will collect runoff via the proposed storm sewer system. Please refer to Appendix B for the BMP Site Drawing. Maintenance and Inspection Guidelines Maintenance, inspection, and all costs associated with maintaining the BMP as described herein is the responsibility of the BMP owner. Any additional procedures deemed necessary by the City or County inspections shall be incorporated into these guidelines. Routine Maintenance The owner shall be responsible for the following minimum operations for maintaining the BMP:  Removal of debris from the filtration facilities  Maintaining vegetation about the unit  Maintaining contributing drainage areas  Maintaining access to the units  Maintain and update the BMP Operations and Maintenance Manual as necessary Remedial Maintenance The owner shall be responsible for correcting and/or replacing any portions of the BMP in unsatisfactory condition. This includes, but is not limited to:  Replacing any portion of inlet and outlet pipe  Grading and reseeding eroded areas 3 BMP Inspection Routine inspections are the responsibility of the BMP owner. These inspections shall be accomplished as scheduled below: MAINTENANCE ITEM INSPECTION SCHEDULE Aqua-swirl sediment level Quarterly during first year, then Biannually AquaShield recommends a quarterly inspection of the units during the first year of operation to develop an appropriate schedule of maintenance. The approved maintenance plan and inspection forms provided in Appendix C shall be used as guidance for performing maintenance and inspection activities. These forms shall be completed and retained by the BMP Owner and produced upon request by the City. The City of Carmel shall be notified of any changes in BMP ownership, major repairs, or BMP failure in writing within 30 days. Notification shall be addressed to: City of Carmel Engineering Department City Hall, One Civic Square Carmel, IN 46032 In the event that the City finds a BMP in need of maintenance or repair, the City will notify the BMP owner of the necessary maintenance or repairs and give the owner a timeframe for completing the maintenance or repairs. If the maintenance or repairs are not completed within the designated timeframe, the City shall perform the repairs or maintenance and bill the landowner for the actual costs for the work. Sediment Removal Removal of the sediment accumulation from the Aquaswirl shall be performed when it is determined that the sediment levels are within 30” from the water surface elevation. The sedimentation and other debris taken from the unit shall be taken and disposed of in compliance with applicable Federal, State, and Local requirements. A vacuum truck shall be used to remove the accumulated sediment from the surface. Immediate remedial maintenance shall be completed in the case of the aforementioned occurrence. 4 Statement of Compliance I hereby certify that I am the ______________________________ and duly authorized agent (title) of ___________________________, and that I have read the preceding manual and shall (company/agency) comply with all terms and requirements stated herein. I understand that this BMP O&M Manual has been created per requirements of the City of Carmel standards and that the recommendations and requirements shall be revised and/or updated to comply with any changes implemented within that document. I recognize that it shall be the right of the City and authorized representatives to enter the property containing the BMP for maintenance and inspection purposes, and that this access shall be granted without hindrances. _______________________________________________ (printed name) _______________________________________________ ____________________ (signature) (date) 6 APPENDIX A Project Vicinity Map Exhibit 1 - Project Location Map Esri, HERE, Garmin, INCREMENT P, USGS, EPA, USDA Streets Carmel Private INDOT City Boundary 2021 Photography Red: Red Green: Green Blue: Blue November 12, 2021 0 0.06 0.120.03 mi 0 0.1 0.20.05 km 1:4,800 ArcGIS WebApp Builder 7 APPENDIX B BMP Map Aqua-Swirl Standard Detail PART OF LOT 8 IN PARK NORTHWESTERN SUBDIVISION AND A PART OF BLOCK 1 OF MAYFLOWER PARK, ALL BEING A PART OF SECTION 7, TOWNSHIP 17 NORTH, RANGE 3 EAST, CLAY TOWNSHIP, HAMILTON COUNTY, INDIANA, DESCRIBED AS FOLLOWS: PLACE OF BEGINNING PLACE OF BEGINNING CONTAINING 0.167 ACRES, MORE OR LESS. STORMWATER TREATMENT SOLUTIONSPhone (888) 344-9044 www.aquashieldinc.com™Varies™1. System shall be designed for the following capacities: Peak Treatment Flow: 3.2 cfs [90 L/s] Sediment Storage: 32 ft³ [0.9 m³] Oil/Debris Storage: 190 gal. [719 L] Phone (888) 344-9044 Fax (423) 826-21122705 Kanasita Drive, Chattanooga, TN 3734312 3/4" [324 mm] OD Max66" [1676 mm]STORMWATER TREATMENT SOLUTIONS www.aquashieldinc.comSTANDARD NOTE:Vent104" [2642 mm]Aqua-Swirl Concentrator Model AS-4 Off-Line Horseshoe Standard DetailAS-4 STD11/05/08Scale:Drawn By:Document:Date:BLR1:20Plan ViewOctagonal Base PlateArched BaffleSection A-AArchedBaffle66"[1676 mm]Swirl Inlet Manhole Frame andCover by Manufacturer.(See Details)Grade (Rim) 32"[813 mm] ODRim elevations to match finishedgrade. HDPE risers can be fieldcut by Contractor.Swirl OutletVent68" [1727 mm]RiserInlet * 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.U.S. Patent No. 6524473 and other Patent PendingUndisturbed SoilGravel Backfill42"[1067 mm]12"[305 mm]BeddingØ54" [Ø1372 mm]3 3/8"ConcreteGravel BackfillPlace small amount ofconcrete to support andlevel manhole frame. DONOT allow manhole frameto rest upon HDPE riser.Soil3/8"3/8"Manhole Frame & Cover DetailNTSFor Non-Traffic Areas OnlyCoverFrameRiserConcreteGravel BackfillSoil3/8"Bollards shall be placed around accessriser(s) in non-traffic areas to preventinadvertent loading by maintenancevehicles.3 3/8"Gravel BackfillPaving3/8"Manhole Frame & Cover DetailNTSFor H-20 Traffic Loading Areas CoverFrameRiser3/8"ConcreteGravel BackfillPaving2 1/4" Typ.7 1/2"Concrete3/8"If traffic loading (H-20) is required oranticipated, a concrete pad must beplaced over the entire StormwaterTreatment System. Sample details ofconcrete pad available upon request.Gravel Backfill shall extend atleast 3.5 feet [1067 mm]outward from Swirl Concentratorand for the full height of theSwirl Concentrator (includingriser) extending laterally toundisturbed soils. (See MH DetailBelow)Pipe couplingby Contractor.12" [305 mm]long Stub-outby Manufacturer.AAOutlet 12 3/4" [324 mm] OD MaxPipe couplingby Contractor.12" [305 mm]long Stub-outby Manufacturer. 8 APPENDIX C Post-Construction BMP Inspection Checklist © AquaShieldTM, Inc. 2016. All rights reserved. Aqua-Swirl® Stormwater Treatment System Inspection and Maintenance Manual AquaShieldTM, Inc. 2733 Kanasita Drive Suite 111 Chattanooga, TN 37343 Toll free (888) 344-9044 Phone: (423) 870-8888 Fax: (423) 826-2112 Email: info@aquashieldinc.com www.aquashieldinc.com November 2016 © AquaShieldTM, Inc. 2016. All rights reserved. Floatable debris in the Aqua-Swirl® Aqua-Swirl® Stormwater Treatment System The Aqua-Swirl® Stormwater Treatment System (Aqua-Swirl®) is a vortex-type hydrodynamic separator designed and supplied by AquaShieldTM, Inc. (AquaShieldTM). Aqua-Swirl® technology removes pollutants including suspended solids, debris, floatables and free-floating oil from stormwater runoff. Both treatment and storage are accomplished in the single swirl chamber without the use of multiple or hidden, blind access chambers. Aqua-Swirl® Stormwater Treatment System © AquaShieldTM, Inc. 2016. All rights reserved. Custom designed AS-9 Twin Aqua-Swirl® System Operation The treatment operation begins when stormwater enters the Aqua-Swirl® through a tangential inlet pipe that produces a circular (or vortex) flow pattern that causes contaminates to settle to the base of the unit. Since stormwater flow is intermittent by nature, the Aqua-Swirl® retains water between storm events providing both dynamic and quiescent settling of solids. The dynamic settling occurs during each storm event while the quiescent settling takes place between successive storms. A combination of gravitational and hydrodynamic drag forces encourages the solids to drop out of the flow and migrate to the center of the chamber where velocities are the lowest. The treated flow then exits the Aqua-Swirl® behind the arched outer baffle. The top of the baffle is sealed across the treatment channel, thereby eliminating floatable pollutants from escaping the system. A vent pipe is extended up the riser to expose the backside of the baffle to atmospheric conditions, preventing a siphon from forming at the bottom of the baffle. Custom Applications The Aqua-Swirl® system can be modified to fit a variety of purposes in the field, and the angles for inlet and outlet lines can be modified to fit most applications. The photo below demonstrates the flexibility of Aqua-Swirl® installations using a “twin” configuration in order to double the water quality treatment capacity. Two Aqua-Swirl® units were placed side by side in order to treat a high volume of water while occupying a small amount of space. © AquaShieldTM, Inc. 2016. All rights reserved. Retrofit Applications The Aqua-Swirl® system is designed so that it can easily be used for retrofit applications. With the invert of the inlet and outlet pipe at the same elevation, the Aqua-Swirl® can easily be connected directly to the existing storm conveyance drainage system. Furthermore, because of the lightweight nature and small footprint of the Aqua-Swirl®, existing infrastructure utilities (i.e., wires, poles, trees) would be unaffected by installation. Aqua-Swirl® System Maintenance The long term performance of any stormwater treatment structure, including manufactured or land based systems, depends on a consistent maintenance plan. Inspection and maintenance functions are simple and easy for the Aqua-Swirl® allowing all inspections to be performed from the surface. It is important that a routine inspection and maintenance program be established for each unit based on: (a) the volume or load of the contaminants of concern, (b) the frequency of releases of contaminants at the facility or location, and (c) the nature of the area being drained. In order to ensure that our systems are being maintained properly, AquaShieldTM offers a maintenance solution to all of our customers. We will arrange to have maintenance performed. Aqua-Swirl® manhole cover © AquaShieldTM, Inc. 2016. All rights reserved. Inspection The Aqua-Swirl® can be inspected from the surface, eliminating the need to enter the system to determine when cleanout should be performed. In most cases, AquaShieldTM recommends a quarterly inspection for the first year of operation to develop an appropriate schedule of maintenance. Based on experience of the system’s first year in operation, we recommend that the inspection schedule be revised to reflect the site-specific conditions encountered. Typically, the inspection schedule for subsequent years is reduced to semi-annual inspection. Maintenance The Aqua-Swirl® has been designed to minimize and simplify the inspection and maintenance process. The single chamber system can be inspected and maintained entirely from the surface thereby eliminating the need for confined space entry. Furthermore, the entire structure (specifically, the floor) is accessible for visual inspection from the surface. There are no areas of the structure that are blocked from visual inspection or periodic cleaning. Inspection of any free- floating oil and floatable debris can be directly observed and maintained through the manhole access provided directly over the swirl chamber. Aqua-Swirl® Inspection Procedure To inspect the Aqua-Swirl®, a hook is typically needed to remove the manhole cover. AquaShieldTM provides a customized manhole cover with our distinctive logo to make it easy for maintenance crews to locate the system in the field. We also provide a permanent metal information plate affixed inside the access riser which provides our contact information, the Aqua-Swirl® model size, and serial number. The only tools needed to inspect the Aqua-Swirl® system are a flashlight and a measuring device such as a stadia rod or pole. Given the easy and direct accessibility provided, floating oil and debris can be observed directly from the surface. Sediment depths can easily be determined by lowering a measuring device to the top of the sediment pile and to the surface of the water. It should be noted that in order to avoid underestimating the volume of sediment in the chamber, the measuring device must be carefully lowered to the top of the sediment pile. Keep in mind that the finer sediment at the top of the pile may offer less resistance to the measuring device than the larger particles which typically occur deeper within the sediment pile. The Aqua-Swirl® design allows for the sediment to accumulate in a semi-conical fashion as illustrated below. That is, the depth to sediment as measured below the water surface may be less in the center of the swirl chamber; and likewise, may be greater at the edges of the swirl chamber. © AquaShieldTM, Inc. 2016. All rights reserved. Sediment inspection using a stadia rod Maximum recommended sediment depth prior to cleanout is 14 inches for all Aqua-Swirl® models Aqua-Swirl® Cleanout Procedure Cleaning the Aqua-Swirl® is simple and quick. Free-floating oil and floatable debris can be observed and removed directly through the 30-inch service access riser provided. A vacuum truck is typically used to remove the accumulated sediment and debris. An advantage of the Aqua-Swirl® design is that the entire sediment storage area can be reached with a vacuum hose 42-48” 14” © AquaShieldTM, Inc. 2016. All rights reserved. Vacuum (vactor) truck quickly cleans the single open access swirl chamber from the surface reaching all the sides. Since there are no multiple or limited (blind) access chambers in the Aqua-Swirl®, there are no restrictions to impede on-site maintenance tasks. Disposal of Recovered Materials AquaShieldTM recommends that all maintenance activities be performed in accordance with appropriate health and safety practices for the tasks and equipment being used. AquaShieldTM also recommends that all materials removed from the Aqua-Swirl® and any external structures (e.g, bypass features) be handled and disposed in full accordance with any applicable local and state requirements. Aqua-Swirl® Inspection and Maintenance Work Sheets on following pages © AquaShieldTM, Inc. 2016. All rights reserved. Aqua-Swirl® Inspection and Maintenance Manual Work Sheets SITE and OWNER INFORMATION Site Name: Site Location: Date: Time: Inspector Name: Inspector Company: Phone #: Owner Name: Owner Address: Owner Phone #: Emergency Phone #: INSPECTIONS I. Floatable Debris and Oil 1. Remove manhole lid to expose liquid surface of the Aqua-Swirl®. 2. Remove floatable debris with basket or net if any present. 3. If oil is present, measure its depth. Clean liquids from system if one half (½) inch or more oil is present. Note: Water in Aqua-Swirl® can appear black and similar to oil due to the dark body of the surrounding structure. Oil may appear darker than water in the system and is usually accompanied by oil stained debris (e.g. Styrofoam, etc.). The depth of oil can be measured with an oil/water interface probe, a stadia rod with water finding paste, a coliwasa, or collect a representative sample with a jar attached to a rod. II. Sediment Accumulation 1. Lower measuring device (e.g. stadia rod) into swirl chamber through service access provided until top of sediment pile is reached. 2. Record distance to top of sediment pile from top of standing water: inches. 3. Maximum recommended sediment depth prior to cleanout is 14 inches for all models. Consult system shop drawing for treatment chamber depth as measured from the inlet pipe invert to base of the unit. © AquaShieldTM, Inc. 2016. All rights reserved. III. Diversion Structures (External Bypass Features) If a diversion (external bypass) configuration is present, it should be inspected as follows: 1. Inspect weir or other bypass feature 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 (concrete or brick) or decaying (steel). 2. Inspect diversion structure and bypass piping for signs of structural damage or blockage from debris or sediment accumulation. 3. When feasible, measure elevations on diversion weir or piping to ensure it is consistent with site plan designs. 4. Inspect downstream (convergence) structure(s) for sign of blockage or structural failure as noted above. CLEANING Schedule cleaning with local vactor company or AquaShieldTM to remove sediment, oil and other floatable pollutants. The captured material generally does not require special treatment or handling for disposal. Site-specific conditions or the presence of known contaminants may necessitate that appropriate actions be taken to clean and dispose of materials captured and retained by the Aqua-Swirl®. All cleaning activities should be performed in accordance with property health and safety procedures. AquaShieldTM always recommends that all materials removed from the Aqua-Swirl® during the maintenance process be handled and disposed in accordance with local and state environmental or other regulatory requirements. MAINTENANCE SCHEDULE I. During Construction Inspect the Aqua-Swirl® every three (3) months and clean the system as needed. The Aqua-Swirl® should be inspected and cleaned at the end of construction regardless of whether it has reached its maintenance trigger. II. First Year Post-Construction Inspect the Aqua-Swirl® every three (3) 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. III. Second and Subsequent Years Post-Construction If the Aqua-Swirl® did not reach full sediment or floatable pollutant capacity in the First Year Post-Construction period, the system can be inspected and cleaned once annuall y. © AquaShieldTM, Inc. 2016. All rights reserved. If the Aqua-Swirl® reached full sediment or floatable pollutant capacity in less than 12 months in the First Year Post-Construction period, the system should be inspected once every six (6) months and cleaned as needed. The Aqua-Swirl® should be cleaned annually regardless of whether it reaches its sediment or floatable pollutant capacity. IV. Bypass Structures Bypass structures should be inspected whenever the Aqua-Swirl® is inspected. Maintenance should be performed on bypass structures as needed. MAINTENANCE COMPANY INFORMATION Company Name: Street Address: City: State/Prov.: Zip/Postal Code: Contact: Title: Office Phone: Cell Phone: ACTIVITY LOG Date of Cleaning: (Next inspection should be 3 months from this data for first year). Time of Cleaning: Start: End: Date of Next Inspection: Floatable debris present: Yes No Notes: Oil present: Yes No Oil depth (inches): Measurement method and notes: STRUCTURAL CONDITIONS and OBSERVATIONS © AquaShieldTM, Inc. 2016. All rights reserved. Structural damage: Yes No Where: Structural wear: Yes No Where: Odors present: Yes No Describe: Clogging: Yes No Describe: Other Observations: NOTES Additional Comments and/or Actions To Be Taken Time Frame ATTACHMENTS  Attach site plan showing Aqua-Swirl® location.  Attach detail drawing showing Aqua-Swirl® dimensions and model number.  If a diversion configuration is used, attach details showing basic design and elevations (where feasible). © AquaShieldTM, Inc. 2016. All rights reserved. Aqua-Swirl® TABULAR MAINTENANCE SCHEDULE Date Construction Started: Date Construction Ended: During Construction Month Activity 1 2 3 4 5 6 7 8 9 10 11 12 Inspect and Clean as needed X X X X Inspect Bypass and maintain as needed X X X X Clean System* X* * The Aqua-Swirl® 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. First Year Post-Construction Month Activity 1 2 3 4 5 6 7 8 9 10 11 12 Inspect and Clean as needed X X X X Inspect Bypass and maintain as needed X X X X Clean System* X* * The Aqua-Swirl® should be cleaned once a year regardless of whether it has reached full pollutant storage capacity. Second and Subsequent Years Post-Construction Month Activity 1 2 3 4 5 6 7 8 9 10 11 12 Inspect and Clean as needed X* Inspect Bypass, maintain as needed X* Clean System* X* * If the Aqua-Swirl® did not reach full sediment or floatable pollutant capacity in the First Year Post-Construction period, the system can be inspected and cleaned once annually. If the Aqua-Swirl® reached full sediment or floatable pollutant capacity in less than 12 months in the First Year Post-Construction period, the system should be inspected once every six (6) months or more frequently if past history warrants, and cleaned as needed. The Aqua -Swirl® should be cleaned annually regardless of whether it reaches its full sediment or floatable pollutant capacity.