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HomeMy WebLinkAboutStormwater Operations and Maintenance ManualDrury Plaza Hotel 96th Street and US-31 Carmel, IN 46240 Stormwater Operation and Maintenance Manual Including: Site Information Operation and Maintenance Inspection Checklist Owner/Developer: Drury Development Corporation 721 Emerson Rd., Suite 200 St. Louis, MO 63141 September 19, 2013 Proposed Hotel BMP Operations and Maintenance Manual OWNER/OPERATOR Drury Development Corporation 721 Emerson Rd., Suite 200 St. Louis, MO 63141 INSPECTIONS & CHECKLISTS An inspection checklist is included to assist in the inspection of the stormwater best management practices. These checklists must be completed and sent to The City of Carmel Stormwater Department. It is recommended that inspection and maintenance be performed quarterly following the end of construction of the Aquaswirl. After the 1st year, it is recommended that the BMP’s be inspected semi-annually. The City of Carmel will require yearly inspection reports of the water quality BMPs. The owner hereby grants the City of Carmel a right of entry for inspections and maintenance as necessary. Vehicles may need to be vacated to allow for the City of Carmel to inspect and maintain the Aquaswirl on site. The City of Carmel will give 24 hour notice to the owner to have these parking spaces vacated. The first inspection will be due one year after the Notice of Termination is submitted. OWNER RESPONSIBILITY It is the owner’s responsibility to perform and/or pay for inspections and maintenance costs as recommended above. In the event that an association is established to maintain the BMP, the owner must notify the City of Noblesville regarding the transfer of responsibility. OWNER ACKNOWLEDGEMENT Signature Date Printed Aquaswirl There is one Aquaswirl located on-site. It is located to the southeast of the site, close to Parkwood Crossing. Aquaswirl units are designed to remove sediment, debris, and free oil from entering the sewer system. After construction the Aquaswirl should be inspected every six months and cleaned as needed or once a year regardless of whether it has reached full pollutant storage capacity. See the attached O&M Manual for the Aquaswirl for complete details of inspection and cleaning. WET DETENTION POND One wet detention pond is located off site to the east. The wet detention pond is located across Parkwood Crossing Drive. Detention ponds function more effectively when they are regularly inspected and maintained. Routine maintenance of the pond includes mowing of the embankment and buffer areas and inspection for erosion and nuisance problems (e.g. burrowing animals, weeds, odors) (SEWRPC, 1991). Trash and debris should be removed routinely to maintain an attractive appearance and to prevent the outlet from becoming clogged. In general, detention ponds should be inspected after every storm event. The embankment and emergency spillway should also be routinely inspected for structural integrity, especially after major storm events. Embankment failure could result in severe downstream flooding. The outlet structures should be checked routinely and cleaned when necessary. When any problems are observed during routine inspections, necessary repairs should be made immediately. Failure to correct minor problems may lead to larger and more expensive repairs or even to pond failure. Typically, maintenance includes repairs to the embankment, emergency spillway, inlet, and outlet; removal of sediment; and control of algal growth, insects, and odors (SEWRPC, 1991). Large vegetation or trees that may weaken the embankment should be removed. Periodic maintenance may also include the stabilization of the outfall area (e.g. adding rip-rap) to prevent erosive damage to the embankment and the stream bank. In most cases, sediments removed from wet detention ponds are suitable for landfill disposal; however, where available, on-site use of removed sediments for soil amendment will reduce maintenance costs. 7260 SHADELAND STATION INDIANAPOLIS, IN 46256-3957 TEL 317.547.5580 FAX 317.543.0270 www.structurepoint.com 1"=100' 09/19/2013 ILT 2013.01784 System Maintenance 3 Sediment inspection using a stadia rod Inspection All AquaShield™ products can be inspected from the surface, eliminating the need to enter the systems to determine when cleanout should be performed. In most cases, AquaShield™ recommends a quarterly inspection of the Stormwater Treatment Systems 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. Aqua-Swirl™ Maintenance The Aqua-Swirl™ has been designed to minimize and simplify the inspection and maintenance process. The system can be inspected and maintained completely 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 needed to remove the manhole cover. AquaShield™ provides a customized manhole cover with our logo to make it easy for maintenance crews to locate the system in the field. We also provide a permanent metal information plate attached inside the access riser, which provides our contact information, the Aqua-Swirl™ model size, and serial number. System Maintenance 4 Vacuum truck cleans the Aqua-Swirl™ 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 tremendous 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. When the sediment pile is within 30 to 36 inches of the water surface, the system should be maintained. 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. The finer sediment at the top of the pile, typically offers less resistance to the measuring device than the larger particles. Aqua-Swirl™ Cleanout Procedure Clean out of the Aqua-Swirl™ is simple. Free-floating oil and floatable debris can be observed and removed directly through the 30-inch service access provided. A vacuum truck can be used to remove the accumulated sediment and debris. It is important to note that the entire sediment storage area can be reached with a vacuum hose from the surface (reaching all the sides). Disposal of the material is typically treated in the same fashion as catch basin cleanouts. AquaShield™ recommends that all materials removed be handled and disposed of in accordance with local and state requirements. An “Inspection and Maintenance Manual” is provided with each Aqua-Swirl™ system for more detailed maintenance procedures. On the following page, you will find sample Inspection Data Sheets. System Maintenance 5 Aqua-Swirl™ Inspection Data Sheet Location: Date Inspector Name Distance to Sediment (in.) Distance to Water (in.) Floatable Layer Thickness (describe) Maintenance Required? (yes/no) System Maintenance 6 Aqua-Swirl™ Maintenance Data Sheet Inspector: Date: Location: Time: INSPECTION General Site Condition Visible Evidence of Spills/ Releases (oils, grease, fuels, paints, chemicals): Visible Evidence of Heavy Sediment Deposition: Swirl Condition of Swirl: Condition of Baffle: Distance to Sediment: Distance to Water: **Note: If sediment is less than 30 to 36 inches below water surface, sediment should be removed. CONTAMINATION REMOVAL DATA Floating Oil and Debris Approx. Volume: Description: Elapsed Removal Time: Sediment Approx. Volume: Description: Elapsed Removal Time: Other Comments Aqua-Swirl™ Model Swirl Chamber Diameter Water Quality Treatment Flow2 Oil/Debris Storage Capacity Sediment Storage Capacity (ft.)(cfs)(gal)(ft3) On/Offline CFD1 812 AS-33.2510161.811020 AS-44.2512183.219032 AS-55.0012244.427045 AS-66.0014306.339065 AS-77.0016368.654090 AS-88.00184211.2710115 AS-99.00204814.2910145 AS-1010.0225417.51130180 AS-1212.0244825.21698270 AS-XXCustom---->26---- *Higher water quality treatment flow rates can be designed with multiple swirls. 1) 2) 10 Aqua-Swirl™ Sizing Chart (English) ThedesignandorientationoftheAqua-Filter™generallyentailssomedegreeofcustomization.For assistanceindesignandspecificsizingusinghistoricalrainfalldata,pleaserefertoanAquaShield™ representativeorvisitourwebsiteatwww.AquaShieldInc.com.CADdetailsandspecificationsareavailable upon request. Maximum Stub-Out Pipe Outer Diameter (in.) The Aqua-Swirl™ConveyanceFlowDiversion(CFD)providesfulltreatmentofthe "firstflush,"whilethepeakdesignstormisdivertedandchanneledthroughthemain conveyance pipe. Please refer to your local representative for more information. Many regulatory agencies areestablishing "waterquality treatment flow rates"fortheir areasbasedontheinitialmovementofpollutantsintothestormdrainagesystem.The treatmentflowrateoftheAqua-Swirl™systemisengineeredtomeetorexceedthe localwaterqualitytreatmentcriteria.This "waterqualitytreatmentflowrate" typically represents approximately 90% to 95% of the total annual runoff volume. AS-22.501.137 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?YNWhere? Any evidence of structural wear?YNWhere? Odors present?YNDescribe: Any plugging?YNDescribe: Activity Log Structural Conditions and Comments Maintenance Company Information Aqua-SwirlTM O and M Manual Page 1 Additional Comments and/or Actions to Be TakenTime Frame NOTES Aqua-SwirlTM O and M Manual Page 2 Date Construction Started: Date Construction Ended: Activity 123456789101112 Inspect and Clean as Needed XXXX Inspect Bypass Structures XXXX (if applicable) and Maintain As Needed Clean System*X* * The Aquaswirl 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 123456789101112 Inspect and Clean as Needed XXXX Inspect Bypass Structures XXXX (if applicable) and Maintain As Needed Clean System*X* * The Aquaswirl should be cleaned once a year regardless of whether it has reached full pollutant storage capacity. Activity 123456789101112 Inspect and Clean as Needed*XX Inspect Bypass Structures*XX (if applicable) and Maintain As Needed Clean System*XX *If the Aquaswirl 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 Aquaswirl 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 Aquaswirl 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 Aquaswirl is inspected and maintained as needed. Aquaswirl TABULAR MAINTENANCE SCHEDULE Second and Subsequent Years Post-Construction Month During Construction Month First Year Post-Construction Month Aqua-SwirlTM O and M Manual Page 3 TABULAR MAINTENANCE SCHEDULE (WET POND) 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 Outfall Structure X X X X and Maintain As Needed Clean Pond* X* * The Pond should be cleaned once it has reached 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 Outfall Structure X X X X and Maintain as Needed Clean Pond* X* * The Pond should be cleaned once 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 X Inspect Outfall Structure X X and Maintain as Needed Clean System* X X *The Pond should be cleaned once it has reached full pollutant storage capacity.