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HomeMy WebLinkAboutO&M Manual3417 SHERMAN DR, BEECH GROVE, IN 46107 // 317.780.1555 // CROSSROADENGINEERS.COM Operations and Maintenance Manual for BMPs at Magnolia Condominiums (Phase 1) City of Carmel Prepared by: CrossRoad Engineers, PC 3417 Sherman Dr. Beech Grove, IN 46107 Phone No.: (317) 780-1555 Fax No.: (317) 780-6525 Email: info@crossroadengineers.com This document was prepared by Derek M. Snyder, CrossRoad Engineers, P.C., 3417 Sherman Drive, Beech Grove, IN 46107 I affirm, under the penalties of perjury, that I have taken reasonable care to redact each Social Security number in this document, unless required by law. March 19, 2021 // Magnolia-Phase 1 O&M Manual // PAGE 2 of 10 Table of Contents BMP Owner/Contact Information ...................................................................................... 3 BMP Location and Description ............................................................................................ 3 Maintenance and Inspection Guidelines .......................................................................... 4 Routine Maintenance ................................................................................................................................. 4 Remedial Maintenance .............................................................................................................................. 4 BMP Inspection ........................................................................................................................................... 4 Sediment Removal ..................................................................................................................................... 5 Maintenance of Traffic ............................................................................................................................... 5 Statement of Compliance ..................................................................................................... 6 Appendix ‘A’: O&M Items ..................................................................................................... 8 Stormtech Isolator Row O&M Items ........................................................................................................ 8 Contech Cascade Hydrodynamic Separator O&M Items ..................................................................... 8 Appendix ‘B’: BMP Site Drawings & Details ..................................................................... 9 Appendix ‘C’: Maintenance Plan & Inspection Forms ................................................. 10 March 19, 2021 // Magnolia-Phase 1 O&M Manual // PAGE 3 of 10 BMP Owner/Contact Information Owner: Magnolia Condos, LLC Contact: Erik Dirks Address: 1132 S. Rangeline Road, Suite 200 Carmel, IN 46032 Email Address: erik@oldtowncompanies.com Business Phone: 317-447-0119 The BMP owner is responsible for all costs associated with the maintenance and inspection of all BMPs as required by the City of Carmel. BMP Location and Description The Magnolia Condominiums project (Phase 1) is located in the southwest corner of the 126th Street (City Center Drive) and Pawnee Road intersection in Carmel, Indiana. The BMPs, Best Management Practices, for the development are located within the proposed public street (Livingstone Drive), private alleys within the development and the on-street parallel parking on Pawnee Road. Please refer to Appendix B for the location map and BMP site exhibits. A BMP, Best Management Practice, is defined as a structural measure (wetland, pond, sand filter, mechanical unit, etc.) or non-structural measure (restrictive zoning, reduced impervious area, etc.). BMPs are designed for the benefit of water quality and quantity. There are multiple BMPs being utilized for this project:  One (1) underground Stormtech detention chamber system with Isolator Rows at each inlet into the system shall be utilized for most of the water quality and quantity treatment from the development. All the impervious areas on site will be routed to, and treated by, the underground detention chamber systems. The Isolator Rows will allow for sediment to be filtered out and captured by the Isolator Row filter fabric and stone base within the detention basin, reducing the amount of sediment leaving the site. The Isolator Rows will have inspection and maintenance ports and Nyloplast structures for access to clean sediment from the detention system.  Each isolator row will contain a sumped structure at the inlet into the row. The sumps shall collect and store fine sediment and organic debris from the runoff within the storm sewers.  One (1) Cascade hydrodynamic separator (Str. No. 7), as manufactured by Contech Engineering Solutions, will be utilized to provide stormwater quality treatment from the project. The unit is a hydrodynamic separator that filters and collects debris and sediment within the unit and allows treated runoff to pass through. The mechanical unit shall be maintained and inspected per the manufacturer’s recommendations found within Appendix A. Please refer to Appendix B for the Cascade CS-4 detail. The CS-4 separator is located in the proposed on-street parking near the intersection of Pawnee Road and Livingston Drive (see Appendix B). March 19, 2021 // Magnolia-Phase 1 O&M Manual // PAGE 4 of 10 Maintenance and Inspection Guidelines Routine Maintenance The owner shall be responsible for the following minimum operations for maintaining the BMPs:  Removal of sediment, debris and litter from inlet and outlet structures within the underground detention chamber system and storm sewer system.  Mowing and/or trimming vegetation within the grassed areas. All clippings should be removed and properly disposed of.  Maintain grass areas without the overuse of fertilizers, herbicides, pesticides, etc.  Maintaining Cascade unit per manufacturer’s recommendations.  Maintain and update the BMP Operations and Maintenance Manual as necessary.  Inspection and removal of debris and sediment from underground detention chamber system Isolator Rows. Remedial Maintenance The owner shall be responsible for correcting and/or replacing any portions of the BMPs in unsatisfactory condition. This includes, but is not limited to:  Repairing/replacing the outlet control structure.  Replacing any portion of the inlet/outlet pipes within the detention facility.  Grading and reseeding eroded areas. BMP Inspection Annual inspections of permanent BMPs shall be performed by the City. Routine inspections are the responsibility of the BMP owner. These inspections shall be accomplished as scheduled below: MAINTENANCE ITEM INSPECTION SCHEDULE Outlet Control Structure Quarterly and After Major Storms Isolator Rows Quarterly and After Major Storms Mechanical Treatment Unit Quarterly and After Major Storms Storm Sewer Inlets & Manholes Monthly and After Major Storms Vegetated Open Areas Monthly and After Major Storms Miscellaneous Monthly The approved maintenance plan and inspection forms provided in Appendices B and C shall used as guidance for performing maintenance and inspection activities. These forms shall be 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. Furthermore, an annual inspection shall be submitted to the City of Carmel. All reports and notifications shall be addressed to: March 19, 2021 // Magnolia-Phase 1 O&M Manual // PAGE 5 of 10 City of Carmel – Department of Engineering Attn: Stormwater Administrator 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 and 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 owner for the actual costs of the work. All maintenance costs associated with the site BMP shall be the responsibility of the owner. Sediment Removal Sediment accumulation in the Isolator Rows shall be inspected on a quarterly basis and after major storm events. Sediment accumulation in the storm sewer inlets and manholes shall be inspected on a monthly basis and after major storm events. In order to determine sediment accumulation in the Isolator Rows, a visual inspection through the inspection ports shall be completed using a flashlight. Sediment accumulation depth shall be checked through the inspection port utilizing a stadia rod. If the average sediment accumulation depth is 3 inches or greater, sediment removal shall be required. Sediment removal from the Isolator Rows shall be accomplished using the JetVac or similar process which will not disturb or destroy the underground chambers, base stone or geotextile fabric wrap. A fixed floor cleaning nozzle with rear facing nozzle spread of 45 inches or more is preferable. Multiple passes of the JetVac shall be applied until backflush water is clean. The sedimentation and any other debris taken from the system shall be disposed of in compliance with all applicable Federal, State and Local requirements. Immediate remedial maintenance shall be completed if any damage to system occurs. Maintenance of Traffic The BMP owner shall provide the City of Carmel Department of Engineering and individual property owners within the development a written 48 hour (minimum) advance notice of BMP inspection and maintenance activities that result in lane restrictions along Pawnee Road and/or Livingstone Drive. Access for property owners and emergency vehicles shall be provided at all times during the inspection and maintenance activities. The contractor performing the inspection and maintenance activities shall maintain traffic at all times. All traffic control measures and procedures shall be in accordance with the latest edition of the Manual on Uniform Traffic Control Devices (M.U.T.C.D.). Inspection and maintenance of the Cascade hydrodynamic separator and diversion manhole (Str. No. 7 and 8, respectively) shall completed from the on-street parking spaces along Pawnee Road. No lane restriction or closure shall be performed with approval from the City of Carmel. March 19, 2021 // Magnolia-Phase 1 O&M Manual // PAGE 6 of 10 Statement of Compliance I hereby certify that I am the ______________________________ and duly authorized agent of (title) ___________________________, and that I have read the preceding manual and shall comply with all terms (company/agency) and requirements stated herein. I understand that this BMP O&M Manual has been created per requirements of the City of Carmel Stormwater Design and Construction Specifications Manual and that the recommendations and requirements shall be revised and/or updated to comply with any changes implemented within that document. The BMP’s governed by this O&M Manual are the following: Isolator Rows, storm sewer sumps, Cascade hydrodynamic separator, and all vegetated swales. 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 by means of the utility and drainage easement previously described in this manual. _______________________________________________ (printed name) _______________________________________________ ____________________ (signature) (date) March 19, 2021 // Magnolia-Phase 1 O&M Manual // PAGE 7 of 10 ACKNOWLEDGMENT State of Indiana, County of _________________, SS: Before me, the undersigned Notary Public in and for said County, personally appeared _________________________________________, _______________________ of (name) (title) ____________________________________, and acknowledged the execution of the foregoing (company/agency) Manual on this _______ day of _____________________, _________ and stated that he/she is the party authorized by the said company/agency to execute the foregoing Manual. Witness my hand and seal this said last named date. My Commission Expires __________________________________ __________________________________ Notary Public __________________________________ __________________________________ County of Residence Printed Name March 19, 2021 // Magnolia-Phase 1 O&M Manual // PAGE 8 of 10 Appendix ‘A’: O&M Items Stormtech Isolator Row O&M Items Contech Cascade Hydrodynamic Separator O&M Items An company 2 THE MOST ADVANCED NAME IN WATER MANAGEMENT SOLUTIONS TM ECCENTRIC HEADER MANHOLE WITH OVERFLOW WEIR STORMTECH ISOLATOR ROW OPTIONAL PRE-TREATMENT OPTIONAL ACCESS STORMTECH CHAMBERS  )( Cascade Separator® Inspection and Maintenance Guide ENGINEERED SOLUTIONS Maintenance The Cascade Separator® system should be inspected at regular intervals and maintained when necessary to ensure optimum performance. The rate at which the system collects sediment and debris will depend upon on-site activities and site pollutant characteristics. For example, unstable soils or heavy winter sanding will cause the sediment storage sump to fill more quickly but regular sweeping of paved surfaces will slow accumulation. Inspection Inspection is the key to effective maintenance and is easily performed. Pollutant transport and deposition may vary from year to year and regular inspections will help ensure that the system is cleaned out at the appropriate time. At a minimum, inspections should be performed twice per year (i.e. spring and fall). However, more frequent inspections may be necessary in climates where winter sanding operations may lead to rapid accumulations, or in equipment wash-down areas. Installations should also be inspected more frequently where excessive amounts of trash are expected. A visual inspection should ascertain that the system components are in working order and that there are no blockages or obstructions in the inlet chamber, flumes or outlet channel. The inspection should also quantify the accumulation of hydrocarbons, trash and sediment in the system. Measuring pollutant accumulation can be done with a calibrated dipstick, tape measure or other measuring instrument. If absorbent material is used for enhanced removal of hydrocarbons, the level of discoloration of the sorbent material should also be identified during inspection. It is useful and often required as part of an operating permit to keep a record of each inspection. A simple form for doing so is provided in this Inspection and Maintenance Guide. Access to the Cascade Separator unit is typically achieved through one manhole access cover. The opening allows for inspection and cleanout of the center chamber (cylinder) and sediment storage sump, as well as inspection of the inlet chamber and slanted skirt. For large units, multiple manhole covers allow access to the chambers and sump. The Cascade Separator system should be cleaned before the level of sediment in the sump reaches the maximum sediment depth and/or when an appreciable level of hydrocarbons and trash has accumulated. If sorbent material is used, it must be replaced when significant discoloration has occurred. Performance may be impacted when maximum sediment storage capacity is exceeded. Contech recommends maintaining the system when sediment level reaches 50% of maximum storage volume. The level of sediment is easily determined by measuring the distance from the system outlet invert (standing water level) to the top of the sediment pile. To avoid underestimating the level of sediment in the chamber, the measuring device must be lowered to the top of the sediment pile carefully. Finer, silty particles at the top of the pile typically offer less resistance to the end of the rod than larger particles toward the bottom of the pile. Once this measurement is recorded, it should be compared to the chart in this document to determine if the height of the sediment pile off the bottom of the sump floor exceeds 50% of the maximum sediment storage. Cleaning Cleaning of a Cascade Separator system should be done during dry weather conditions when no flow is entering the system. The use of a vacuum truck is generally the most effective and convenient method of removing pollutants from the system. Simply remove the manhole cover and insert the vacuum tube down through the center chamber and into the sump. The system should be completely drained down and the sump fully evacuated of sediment. The areas outside the center chamber and the slanted skirt should also be washed off if pollutant build- up exists in these areas. In installations where the risk of petroleum spills is small, liquid contaminants may not accumulate as quickly as sediment. However, the system should be cleaned out immediately in the event of an oil or gasoline spill. Motor oil and other hydrocarbons that accumulate on a more routine basis should be removed when an appreciable layer has been captured. To remove these pollutants, it may be preferable to use absorbent pads since they are usually less expensive to dispose than the oil/water emulsion that may be created by vacuuming the oily layer. Trash and debris can be netted out to separate it from the other pollutants. Then the system should be power washed to ensure it is free of trash and debris. Manhole covers should be securely seated following cleaning activities to prevent leakage of runoff into the system from above and to ensure proper safety precautions. Confined space entry procedures need to be followed if physical access is required. Disposal of all material removed from the Cascade Separator system must be done in accordance with local regulations. In many locations, disposal of evacuated sediments may be handled in the same manner as disposal of sediments removed from catch basins or deep sump manholes. Check your local regulations for specific requirements on disposal. If any components are damaged, replacement parts can be ordered from the manufacturer. A vacuum truck excavates pollutants from the systems.A Cascade Separator unit can be easily cleaned in less than 30 minutes. Model Number Diameter Distance from Water Surface to Top of Sediment Pile Sediment Storage Capacity ft m ft m y3 m3 CS-3 3 0.9 1.5 0.5 0.4 0.3 CS-4 4 1.2 1.5 0.5 0.7 0.5 CS-5 5 1.3 1.5 0.5 1.1 0.8 CS-6 6 1.8 1.5 0.5 1.6 1.2 CS-8 8 2.4 1.5 0.5 2.8 2.1 CS-10 10 3.0 1.5 0.5 4.4 3.3 CS-12 12 3.6 1.5 0.5 6.3 4.8 Note: The information in the chart is for standard units. Units may have been designed with non-standard sediment storage depth. Cascade Separator® Maintenance Indicators and Sediment Storage Capacities 800.925.5240 www.ContechES.com SUPPORT • Drawings and specifications are available at www.ContechES.com. • Site-specific design support is available from our engineers. ©2020 Contech Engineered Solutions LLC, a QUIKRETE Company Contech Engineered Solutions LLC provides site solutions for the civil engineering industry. Contech’s portfolio includes bridges, drainage, sanitary sewer, stormwater, and earth stabilization products. For information, visit www.ContechES.com or call 800.338.1122 NOTHING IN THIS CATALOG SHOULD BE CONSTRUED AS A WARRANTY. APPLICATIONS SUGGESTED HEREIN ARE DESCRIBED ONLY TO HELP READERS MAKE THEIR OWN EVALUATIONS AND DECISIONS, AND ARE NEITHER GUARANTEES NOR WARRANTIES OF SUITABILITY FOR ANY APPLICATION. CONTECH MAKES NO WARRANTY WHATSOEVER, EXPRESS OR IMPLIED, RELATED TO THE APPLICATIONS, MATERIALS, COATINGS, OR PRODUCTS DISCUSSED HEREIN. ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE ARE DISCLAIMED BY CONTECH. SEE CONTECH’S CONDITIONS OF SALE (AVAILABLE AT WWW.CONTECHES.COM/COS) FOR MORE INFORMATION. Cascade Separator Maintenance 08/20 ENGINEERED SOLUTIONS Cascade Separator® Inspection & Maintenance Log Cascade Model:Location: Date Depth Below Invert to Top of Sediment1 Floatable Layer Thickness2 Describe Maintenance Performed Maintenance Personnel Comments 1. The depth to sediment is determined by taking a measurement from the manhole outlet invert (standing water level) to the top of the sediment pile. Once this measurement is recorded, it should be compared to the chart in the maintenance guide to determine if the height of the sediment pile off the bottom of the sump floor exceeds 50% of the maximum sediment storage. Note: to avoid underestimating the volume of sediment in the chamber, the measuring device must be carefully lowered to the top of the sediment pile. 2. For optimum performance, the system should be cleaned out when the floating hydrocarbon layer accumulates to an appreciable thickness. In the event of an oil spill, the system should be cleaned immediately. March 19, 2021 // Magnolia-Phase 1 O&M Manual // PAGE 9 of 10 Appendix ‘B’: BMP Site Drawings & Details PROJECT LOCATION NORTHDEVELOPMENT CONSULTANTSTRANSPORTATION & BEECH GROVE, IN 461073417 SHERMAN DRIVE (317) 780-1555 CROSSROADENGINEERS.COMOPERATIONS & MAINTENANCE MANUAL SITE DRAWINGS LOCATION MAP PAWNEE ROADBUILDING #1 BUILDING #2 BUILDING #4 BUILDING #6 Livingstone Dr. BUILDING #5 (FUTURE PHASE) BUILDING #3 (FUTURE PHASE)NORTHOPERATIONS & MAINTENANCE MANUAL SITE DRAWINGS BMP DETAILS - PLAN VIEW OPERATIONS & MAINTENANCE MANUAL SITE DRAWINGS BMP DETAILS-OUTLET CONTROL SHARP CRESTED WEIR DETAIL PLAN VIEW OUTLET STRUCTURE DETAIL - STR. NO. 9 ELEVATION VIEW OPERATIONS & MAINTENANCE MANUAL SITE DRAWINGS BMP DETAILS-CROSS SECTIONS 24" MIN. SUMP REQUIRED 24" HDPE ACCESS PIPE REQUIRED USE FACTORY PARTIAL CUT END CAP PART #: MC3500IEPP24BC OR MC3500IEPP24BW ONE LAYER OF ADS PLUS175 WOVEN GEOTEXTILE BETWEEN FOUNDATION STONE AND CHAMBERS 8.25' MIN WIDE CONTINUOUS FABRIC WITHOUT SEAMS CATCH BASIN OR MANHOLE COVER PIPE CONNECTION TO END CAP WITH ADS GEOSYNTHETICS 601T NON-WOVEN GEOTEXTILE MC-3500 CHAMBER MC-3500 END CAP MAINTENANCE PORT ELEVATED BYPASS MANIFOLD INSTALL FLAMP ON 24" ACCESS PIPE PART #: MC350024RAMP MC-3500 ISOLATOR ROW DETAIL 18" MIN*8' MAX 12" MIN77" ADS GEOSYNTHETICS 601T NON-WOVEN GEOTEXTILE ALL AROUND CLEAN, CRUSHED, ANGULAR STONE IN A & B LAYERS 12" MIN 9" MIN D C B A *TO BOTTOM OF FLEXIBLE PAVEMENT. FOR UNPAVED INSTALLATIONS WHERE RUTTING FROM VEHICLES MAY OCCUR, INCREASE COVER TO 30". MC-3500 END CAP SUBGRADE SOILS HMA PAVEMENT 45" 9" MIN MC-3500 CROSS SECTION DETAIL BOTTOM OF STONE ELEV.=836.75 BOTTOM OF CHAMBER ELEV.=837.50 TOP OF CHAMBER ELEV.=841.25 TOP OF STONE ELEV.=842.25 18" MIN WIDTH CONCRETE SLAB 8" MIN THICKNESS MC-3500 10" INSPECTION PORT DETAIL NOT TO SCALE MC-3500 CHAMBER 10" SDR35 PIPE 15" NYLOPLAST INLINE DRAIN BODY W/SOLID HINGED COVER PART# 2715AG10IP SOLID COVER: 1599CGC CONCRETE COLLAR NOT REQUIRED FOR UNPAVED APPLICATIONS CONCRETE COLLAR PAVEMENT 10" INSERTA TEE PART# 10P35STIP INSERTA TEE TO BE CENTERED ON CORRUGATION CREST OPERATIONS & MAINTENANCE MANUAL SITE DRAWINGS BMP DETAILS-CASCADE UNIT OPERATIONS & MAINTENANCE MANUAL SITE DRAWINGS BMP DETAILS-WQ DIVERSION WQ DIVERSION MANHOLE DETAIL - STR. NO. 8 PLAN VIEW A A ELEVATION VIEW (A-A) March 19, 2021 // Magnolia-Phase 1 O&M Manual // PAGE 10 of 10 Appendix ‘C’: Maintenance Plan & Inspection Forms Outlet Control Structures 1. Low & High Flow Orifice 2. Trash Present A. Location B. Corrosion 3. Excessive Sediment Buildup 4. Concrete/Masonry Condition A. Cracks or Displacement B. Spalling 5. Outlet Pipe Condition 6. Condition of Downstream Storm 7. Other (Describe) Storm Sewer Structures w/ Sumps 1. Sediment/Trash Present 2. Concrete/Masonry/HDPE/PVC Condition A. Cracks or Displacement B. Spalling 3. Inlet/Outlet Pipe Conditions 4. Other (Describe) Cascade WQ Unit 1. Floatable Debris/Trash Present 2. Inlet/Outlet Pipe Conditions 3. Inlet Chamber/Flume A. Condition 4. Sediment Buildup A. Sediment Depth Phone Number: Site Status: Date: Time: Inspector: Satisfactory/ Unsatisfactory CommentsMaintenance Item Operation, Maintenance, and Management Inspection Checklist for BMP Owners Magnolia - Phase 1 Owner Name & Address: Isolator Rows 1. Floatable Debris/Trash Present 2. Damaged Geotextile Fabric A. Location B. Describe 3. Sediment Buildup 4. Visible Pollution Miscellaneous 1. Complaints From Residents 2. Public Hazards (Describe) Additional Comments Actions to be Taken Maintenance Item Satisfactory/ Unsatisfactory Comments