OPERATIONS & MAINTENANCE MANUAL FOR POST CONSTRUCTION MEASURES

Transcription

1 OPERATIONS & MAINTENANCE MANUAL FOR POST CONSTRUCTION MEASURES THE CARMONY BUILDING PARAGON REALTY NORTH GREEN STREET BROWNSBURG, HENDRICKS COUNTY INDIANA 8365 Keystone Crossing, Suite 201 Indianapolis, IN Phone: (317) Fax: (317) May 8, 2017 Revised June 6, 2017

2 The Carmony Building OPERATIONS AND MAINTENANCE MANUAL Table of Contents 1. BMP Owner 2. Definition of Best Management Practice (BMP) 3. Description of BMP s a. Wet Detention Basin 4. Inspection and Maintenance Frequency and Corrective Measures a. Conveyance Systems b. Wet Detention Basin 5. Owner Acknowledgement Agreement 6. Operation, Maintenance and Management Inspection Checklists 7. BMP Location Maps 8. BMP Details

3 1. BMP OWNER (Wet Pond) Name: Address: Brownsburg Parks 402 E Main Street Brownsburg, IN Business phone #: DEFINITION OF A BEST MANAGEMENT PRACTICE (BMP) A Best Management Practice (BMP) is defined as a structural measure (wetland, pond, vegetated swale, hydrodynamic filter, etc.) designed to benefit water quality and storm water quantity. Storm water can easily become polluted by grease, oil, sediment, chemicals, and other contaminants as it travels to an inlet or receiving water. The purpose of a BMP is to improve storm water quality and runoff rates primarily through the removal of Total Suspended Solids (TSS) and/or storm water storage and infiltration. The Town of Brownsburg inspecting agents will enter the development to inspect and maintain the BMP s as necessary. 3. DESCRIPTION OF BMP s: Wet Detention Pond with upstream Water Quality Catch Basin: BMP#1 A wet pond removes pollutants from water by both physical and biological processes. The permanent pool in the pond encourages settling of pollutants by slowing down storm water moving through the basin. Storm flows mix and partially or completely replace the water in the pol. Between storms, biological activity and nutrient uptake by plants and algae remove nutrients from the water. Solid particles also settle out during this time. The Wet Detention Pond is located at the west edge of the project development. 4. INSPECTION AND MAINTENANCE FREQUENCY AND CORRECTIVE MEASURES Conveyance: Conveyance Systems include pipe outlets, pipes, pavement inlets, and manhole(s) that collect and convey runoff from buildings and parking areas to any of the below facilities. The primary maintenance objective is to prevent sediment buildup and clogging, which reduces pollutant removal efficiency and may lead to basin failure. Routine maintenance activities, and the frequency at which they will be conducted, are shown in Table 1.

4 Table 1 Routine Maintenance Activities for Conveyance Systems No. Maintenance Task Frequency of Task 1 Remove obstructions, debris and trash from all storm sewer inlets and dispose of properly. 2 Inspect structures EX601 thru 624, to ensure they drain between storms. Check 2 3 days after significant storm events to confirm drainage. 3 Monitor structures listed above, confirm structures are dry during dry season. 4 Inspect structures listed above to determine depth of accumulated sediment and amount of floatable materials. Remove sediment when it is 2 inches deep in structure. 5 Check all pipes between structures to verify they are free of obstructions. Remove any observed debris at time of observation to keep storm pipe systems clear. 6 Remove any trash, grass clippings and other debris from the paved surface areas draining to inlets and dispose of properly. Monthly, or as needed after storm events Monthly during wet season, or as needed after significant storm events Annually, during dry season As needed Semi annually, or after large storm events. Monthly, or as needed after storm events Conveyance Systems Continued: Catch Basins and Pavement Inlets: All catch basin and inlet castings should be inspected monthly and after each significant rainfall event to ensure optimum performance. More frequent inspections may be needed when there is a higher potential for trash, litter, or leaves to plug or cover the castings. (public events and fall leaf drop). Inspect the interior of manholes, catch basins and inlets (Structures EX601 thru 624) two (2) times per year (preferably in spring and fall) and monthly during wet periods to ensure they are working in their intended fashion and that they are free of debris. Clean structures when sediment depths reach 2 inches near pipe inverts. At a minimum, remove floating debris at the time of the inspection. More frequent inspections may be needed when there is a higher potential for trash, litter, or leaves to enter the system (public events and fall leaf drop). Pipes and Culverts: Inspect 2 times per year (preferably in spring and fall) to ensure that the systems are working in their

5 intended fashion and that they are free of debris. Remove any obstructions to flow; remove accumulated sediments and debris at the inlet and within the pipes and repair any erosion damage at the inlet and outlet. Special attention should be paid to the outfall into the wet detention basin. Erosion control inspections at this structure are to be conducted bi monthly and after each major storm event to mitigate any potential soil erosion related issues. Remove any obstructions to flow; remove accumulated sediments and debris at the outlet and within the pipe and repair any erosion damage. Vegetated Areas: Inspect vegetated areas, slopes, and embankments early in the growing season to identify active or potential erosion problems. Replant bare areas or areas with sparse growth. Where rill erosion is evident, armor the area with an appropriate lining or divert the erosive flows to on site areas able to withstand the concentrated flows. The facilities shall be inspected after major storms and any identified deficiencies will be corrected. Ditches, Swales and other Open Storm water Channels: Inspect 2 times per year (preferably in Spring and Fall) to ensure they are working in their intended fashion and that they are free of sediment and debris. Remove any obstructions to flow, including accumulated sediments and debris and vegetated growth. Repair any erosion of the ditch lining. Vegetated ditches will be mowed at least annually or otherwise maintained to control the growth of woody vegetation and maintain flow capacity. Any woody vegetation growing through riprap linings must also be removed. Repair any slumping side slopes as soon as practicable. If the ditch has a riprap lining, replace riprap on areas where any underlying filter fabric or underdrain gravel is showing through the stone or where stones have dislodged. Correct any erosion of the channel's bottom or side slopes. The facilities will be inspected after major storms and any identified deficiencies will be corrected. Wet Detention Pond The wet detention facility is an open pond and will require monthly (including after a heavy rainfall event) and annual inspections of all aspects of the BMP design. Monthly Inspections: Permanent Pools These are the areas of open water that remain after the storm water volume draws down. Items to be inspected include: Remove invasive plant species and woody vegetation that develop on the side slopes or wetland fringes. Remove all floatable debris from inlet and outlet structures. Report visible pollution such as oily sheens, discoloration, and cloudy or muddy water. Shoreline pollution such as trash or oily liquids. Remove miscellaneous debris.

6 Other areas of Monthly Inspections These areas are critical to the structural integrity of the BMP. Items that will need to be checked include: Erosion at the outfalls if erosion is occurring, then additional rip rap will need to be placed. Outlet control structure the structure should be inspected to ensure proper function and to keep the inlets and outlets clear of debris or other blockage. The restrictor structure shall be inspected monthly and after each major storm event to ensure that the orifices are not clogged and that the system is retaining and then draining storm water within hours of the storm event Note all public hazards within the boundary of the BMP. Annual Inspections & Inspections after Major Rainfall Events (>1 inch in 24 hours): Storm Sewers and Drains clear and functioning Remove all debris and ensure proper operation. Erosion embankment The berms on the BMP should be naturally vegetated. These areas need to be inspected for rilling on the banks of the berms. Vegetation This area includes all native vegetation within the boundary of the BMP. Some species of plants are considered invasive and should be eradicated. Species such as reed canary grass (Phalaris arundinacea), purple loosestrife (Lythrum salicaria), common reed (Phragmites australis), and cattails (Typha spp.) would be considered fast colonizing and invasive species. Animal burrows Any animal burrows will need to be controlled immediately to uphold the integrity of the berm. Leaks or seeps on embankment The embankment should be inspected for any water infiltration through the berm. Slope protection failure Inspect the slopes of the BMP for any sliding. Please note location and describe the failure. Check average pond depth on an annual basis. If average pond depth is 5 feet or less pond shall be drained and sediment excavated and hauled off site in order to return pond to original design depth. This Operation and Maintenance Manual is submitted to the Brownsburg Town Council with the intent of insuring the longevity and adequate functioning of the Contech CDS BMP units and the Underground Detention Basin. The BMP Owner, the Town of Brownsburg, is responsible for any additional maintenance and/or repair activities noted in this text as required by the Town of Brownsburg, and any activities required that are above and beyond the descriptions in the following text, but are required to maintain the function and longevity of the BMP.

7 5. OWNER ACKNOWLEDGMENT AGREEMENT Owner Acknowledgement Agreement ("Agreement)

8 For good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the undersigned owner ( Owner ) hereby submits this Operation and Maintenance Manual ( Manual ) to the Town of Brownsburg ( Town ) as a written acknowledgement of Owner s warranty and agreement to institute, maintain, and follow the water quality Best Management Practices ( BMPs ) listed below, and to follow and abide by the inspection schedule and maintenance activities listed in this Manual. The Owner also hereby agrees to provide, at Owner s cost, all additional maintenance, repair, and/or replacement services reasonably necessary to maintain the function and longevity of the BMPs from and including the date this Agreement is executed by Owner to and including the date on which a new Agreement is filed with the Town by another party who assumes all of the obligations and responsibilities of Owner as set forth herein. The Town of Brownsburg is Granted Authority to access the BMP s via the drive aisles within the parking lots. BMPs: Wet Detention Basin Owner Signature Date Printed Name Company STATE OF INDIANA ) ) SS: COUNTY OF HENDRICKS ) BEFORE ME, the undersigned, a Notary Public in and for said County and State, personally appeared Owner subscribed and sworn before this day of,. County of Residence Commission Expiration Date Printed Name Signature

9 6. OPERATIONS, MAINTENANCE AND MANAGEMENT CHECKLISTS

10 Wet Detention Inspection Check List and Frequency Schedule

11 Wet Storm Water Detention Pond 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: 6BMaintenance Item 7BSatisfactory/ Unsatisfactory 8BComments Embankment and Emergency Spillway (inspect annually and after major storms) 1) Vegetation 2) Erosion on embankment Leaks or seeps on embankment a) Location b) Describe 3) Animal burrows 4) Drains clear and functioning 5) Emergency spillway clear of obstructions 6) Other (describe)

12 Outfall Pipe and Principal spillway (Inspect monthly) Type: Reinforced concrete 1) Outfall blocked, or sediment collected at trash racks 2) Other (describe) Detention Area (Inspect monthly) 1) Floatable debris removal needed 2) Visible pollution 3) Shoreline problem 4) Other (describe) Perimeter Landscaping and Ground Cover 1) Vegetation Debris removal needed 2) Other (describe) Other (Inspect monthly) 1) Erosion at outfalls into pond 2) Encroachment into drainage easement areas 3) Complaints from residents 4) Public hazards (describe) Additional Comments: Action to be taken: Time Frame:

13 7. BMP LOCATION MAP

14 8. BMP DETAILS

15 The Carmony Building OPERATIONS AND MAINTENANCE MANUAL Table of Contents 1. BMP Owner 2. Definition of Best Management Practice (BMP) 3. Description of BMP s a. Wet Detention Basin 4. Inspection and Maintenance Frequency and Corrective Measures a. Conveyance Systems b. Wet Detention Basin 5. Owner Acknowledgement Agreement 6. Operation, Maintenance and Management Inspection Checklists 7. BMP Location Maps 8. BMP Details

16 1. BMP OWNER (Wet Pond) Name: Address: Brownsburg Parks 402 E Main Street Brownsburg, IN Business phone #: DEFINITION OF A BEST MANAGEMENT PRACTICE (BMP) A Best Management Practice (BMP) is defined as a structural measure (wetland, pond, vegetated swale, hydrodynamic filter, etc.) designed to benefit water quality and storm water quantity. Storm water can easily become polluted by grease, oil, sediment, chemicals, and other contaminants as it travels to an inlet or receiving water. The purpose of a BMP is to improve storm water quality and runoff rates primarily through the removal of Total Suspended Solids (TSS) and/or storm water storage and infiltration. The Town of Brownsburg inspecting agents will enter the development to inspect and maintain the BMP s as necessary. 3. DESCRIPTION OF BMP s: Wet Detention Pond: BMP#1 A wet pond removes pollutants from water by both physical and biological processes. The permanent pool in the pond encourages settling of pollutants by slowing down storm water moving through the basin. Storm flows mix and partially or completely replace the water in the pol. Between storms, biological activity and nutrient uptake by plants and algae remove nutrients from the water. Solid particles also settle out during this time. The Wet Detention Pond is located at the west edge of the project development. 4. INSPECTION AND MAINTENANCE FREQUENCY AND CORRECTIVE MEASURES Conveyance: Conveyance Systems include pipe outlets, pipes, pavement inlets, and manhole(s) that collect and convey runoff from buildings and parking areas to any of the below facilities. The primary maintenance objective is to prevent sediment buildup and clogging, which reduces pollutant removal efficiency and may lead to basin failure. Routine maintenance activities, and the frequency at which they will be conducted, are shown in Table 1.

17 The primary maintenance objective is to prevent sediment buildup and clogging, which reduces pollutant removal efficiency and may lead to basin failure. Routine maintenance activities, and the frequency at which they will be conducted, are shown in Table 1. Table 1 Routine Maintenance Activities for Conveyance Systems No. Maintenance Task Frequency of Task 1 Remove obstructions, debris and trash from all storm sewer inlets and dispose of properly. 2 Inspect structures EX601 thru 624, to ensure they drain between storms. Check 2-3 days after significant storm events to confirm drainage. 3 Monitor structures listed above, confirm structures are dry during dry season. 4 Inspect structures listed above to determine depth of accumulated sediment and amount of floatable materials. Remove sediment when it is 2 inches deep in structure. 5 Check all pipes between structures to verify they are free of obstructions. Remove any observed debris at time of observation to keep storm pipe systems clear. 6 Remove any trash, grass clippings and other debris from the paved surface areas draining to inlets and dispose of properly. Monthly, or as needed after storm events Monthly during wet season, or as needed after significant storm events Annually, during dry season As needed Semi-annually, or after large storm events. Monthly, or as needed after storm events Conveyance Systems Continued: Catch Basins and Pavement Inlets: All catch basin and inlet castings should be inspected monthly and after each significant rainfall event to ensure optimum performance. More frequent inspections may be needed when there is a higher potential for trash, litter, or leaves to plug or cover the castings. (public events and fall leaf drop). Inspect the interior of manholes, catch basins and inlets (Structures EX601 thru 624) two (2) times per year (preferably in spring and fall) and monthly during wet periods to ensure they are working in their intended fashion and that they are free of debris. Clean structures when sediment depths reach 2- inches near pipe inverts. At a minimum, remove floating debris at the time of the inspection. More frequent inspections may be needed when there is a higher potential for trash, litter, or leaves to enter the system (public events and fall leaf drop).

18 Pipes and Culverts: Inspect 2 times per year (preferably in spring and fall) to ensure that the systems are working in their intended fashion and that they are free of debris. Remove any obstructions to flow; remove accumulated sediments and debris at the inlet and within the pipes and repair any erosion damage at the inlet and outlet. Special attention should be paid to the outfall into the wet detention basin. Erosion control inspections at this structure are to be conducted bi-monthly and after each major storm event to mitigate any potential soil erosion related issues. Remove any obstructions to flow; remove accumulated sediments and debris at the outlet and within the pipe and repair any erosion damage. Vegetated Areas: Inspect vegetated areas, slopes, and embankments early in the growing season to identify active or potential erosion problems. Replant bare areas or areas with sparse growth. Where rill erosion is evident, armor the area with an appropriate lining or divert the erosive flows to on-site areas able to withstand the concentrated flows. The facilities shall be inspected after major storms and any identified deficiencies will be corrected. Ditches, Swales and other Open Storm water Channels: Inspect 2 times per year (preferably in Spring and Fall) to ensure they are working in their intended fashion and that they are free of sediment and debris. Remove any obstructions to flow, including accumulated sediments and debris and vegetated growth. Repair any erosion of the ditch lining. Vegetated ditches will be mowed at least annually or otherwise maintained to control the growth of woody vegetation and maintain flow capacity. Any woody vegetation growing through riprap linings must also be removed. Repair any slumping side slopes as soon as practicable. If the ditch has a riprap lining, replace riprap on areas where any underlying filter fabric or underdrain gravel is showing through the stone or where stones have dislodged. Correct any erosion of the channel's bottom or side slopes. The facilities will be inspected after major storms and any identified deficiencies will be corrected. Wet Detention Pond The wet detention facility is an open pond and will require monthly (including after a heavy rainfall event) and annual inspections of all aspects of the BMP design. Monthly Inspections: Permanent Pools These are the areas of open water that remain after the storm water volume draws down. Items to be inspected include: Remove invasive plant species and woody vegetation that develop on the side slopes or wetland fringes. Remove all floatable debris from inlet and outlet structures. Report visible pollution such as oily sheens, discoloration, and cloudy or muddy water. Shoreline pollution such as trash or oily liquids.

19 Remove miscellaneous debris. Other areas of Monthly Inspections These areas are critical to the structural integrity of the BMP. Items that will need to be checked include: Erosion at the outfalls -- if erosion is occurring, then additional rip rap will need to be placed. Outlet control structure the structure should be inspected to ensure proper function and to keep the inlets and outlets clear of debris or other blockage. The restrictor structure shall be inspected monthly and after each major storm event to ensure that the orifices are not clogged and that the system is retaining and then draining storm water within hours of the storm event Note all public hazards within the boundary of the BMP. Annual Inspections & Inspections after Major Rainfall Events (>1 inch in 24 hours): Storm Sewers and Drains clear and functioning Remove all debris and ensure proper operation. Erosion embankment The berms on the BMP should be naturally vegetated. These areas need to be inspected for rilling on the banks of the berms. Vegetation This area includes all native vegetation within the boundary of the BMP. Some species of plants are considered invasive and should be eradicated. Species such as reed canary grass (Phalaris arundinacea), purple loosestrife (Lythrum salicaria), common reed (Phragmites australis), and cattails (Typha spp.) would be considered fast colonizing and invasive species. Animal burrows Any animal burrows will need to be controlled immediately to uphold the integrity of the berm. Leaks or seeps on embankment The embankment should be inspected for any water infiltration through the berm. Slope protection failure Inspect the slopes of the BMP for any sliding. Please note location and describe the failure. Check average pond depth on an annual basis. If average pond depth is 5 feet or less pond shall be drained and sediment excavated and hauled off site in order to return pond to original design depth. This Operation and Maintenance Manual is submitted to the Brownsburg Town Council with the intent of insuring the longevity and adequate functioning of the Contech CDS BMP units and the Underground Detention Basin. The BMP Owner, the Town of Brownsburg, is responsible for any additional maintenance and/or repair activities noted in this text as required by the Town of Brownsburg, and any activities required that are above and beyond the descriptions in the following text, but are required to maintain the function and longevity of the BMP.

20 5. OWNER ACKNOWLEDGMENT AGREEMENT

21 Owner Acknowledgement Agreement ("Agreement) For good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the undersigned owner ( Owner ) hereby submits this Operation and Maintenance Manual ( Manual ) to the Town of Brownsburg ( Town ) as a written acknowledgement of Owner s warranty and agreement to institute, maintain, and follow the water quality Best Management Practices ( BMPs ) listed below, and to follow and abide by the inspection schedule and maintenance activities listed in this Manual. The Owner also hereby agrees to provide, at Owner s cost, all additional maintenance, repair, and/or replacement services reasonably necessary to maintain the function and longevity of the BMPs from and including the date this Agreement is executed by Owner to and including the date on which a new Agreement is filed with the Town by another party who assumes all of the obligations and responsibilities of Owner as set forth herein. The Town of Brownsburg is Granted Authority to access the BMP s via the drive aisles within the parking lots. BMPs: Wet Detention Basin Owner Signature Date Printed Name Company STATE OF INDIANA ) ) SS: COUNTY OF HENDRICKS ) BEFORE ME, the undersigned, a Notary Public in and for said County and State, personally appeared Owner subscribed and sworn before this day of,. County of Residence Commission Expiration Date Printed Name Signature

22 6. OPERATIONS, MAINTENANCE AND MANAGEMENT CHECKLISTS

23 Wet Detention Inspection Check List and Frequency Schedule

24 Wet Storm Water Detention Pond 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: 6BMaintenance Item 7BSatisfactory/ Unsatisfactory 8BComments Embankment and Emergency Spillway (inspect annually and after major storms) 1) Vegetation 2) Erosion on embankment Leaks or seeps on embankment a) Location b) Describe 3) Animal burrows 4) Drains clear and functioning 5) Emergency spillway clear of obstructions 6) Other (describe)

25 Outfall Pipe and Principal spillway (Inspect monthly) Type: Reinforced concrete 1) Outfall blocked, or sediment collected at trash racks 2) Other (describe) Detention Area (Inspect monthly) 1) Floatable debris removal needed 2) Visible pollution 3) Shoreline problem 4) Other (describe) Perimeter Landscaping and Ground Cover 1) Vegetation Debris removal needed 2) Other (describe) Other (Inspect monthly) 1) Erosion at outfalls into pond 2) Encroachment into drainage easement areas 3) Complaints from residents 4) Public hazards (describe) Additional Comments: Action to be taken: Time Frame:

26 7. BMP LOCATION MAP

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31 8. BMP DETAILS

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