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HomeMy WebLinkAboutSW1170501_O&M Agreement/Plan_20240417 Operation & Maintenance Agreement Project Name: Imo-( ©( t)-tL- Project Location: )()5 ! 1 e,nt,,{5 - i 't'tU , (tJC a k6O} l4tu,s R0 4-t.-8wyl oA.)Ce — - - Cover Page Maintenance records shall be kept on the following SCM(s). This maintenance record shall he kept in a log in a known set location. Any deficient SCM elements noted in the inspection will be corrected, repaired, or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the pollutant removal efficiency of the SCM(s). The SCM(s)on this project include (check all that apply&corresponding O&M sheets will be added automatically): Infiltration Basin Quantity: d Location(s): Infiltration Trench Quantity: (rj Location(s): Bioretention Cell Quantity: p Location(s): Wet Pond Quantity: 0 Location(s): Stormwater Wetland Quantity: 0 Location(s): Permeable Pavement Quantity: ,D Location(s): Sand Filter Quantity: Fj Location(s): Rainwater Harvesting Quantity: 0 Location(s): Green Roof Quantity: O Location(s): Level Spreader- Filter Strip Quantity: 0 Location(s): Proprietary System Quantity: D Location(s): Treatment Swale Quantity: 0 Location(s): Dry Pond Quantity: D Location(s): Disconnected Impervious Surface Present: No Location(s): User Defined SCM Present: No Location(s): Low Density Present: —N\{t Type: I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed for each SCM above, and attached O&M tables. I agree to notify NCDEQ of any problems with the system or prior to any changes to the system or responsible party. Responsible Party: y,J.rv- t1/4Avo..a '-/ Title&Organization: P Z-/•,-v1— bal., Kt.A.1,5 Q.�/U1 (�1_�- Street address: 1 k'Zj () (,,,A, J7 so 1 fi6 a. I City, state, zip: �'�C(,� 9�► L a'2 M k_ Phone number(s): .1 - Ow — 1� � Email: (,JJ--,,De 8-,\/4-3r'5-U_. (o/-1 Signature: Date: tl Il a a LA 1, 1(P1li-ce✓ (- ).}cart-a La i#o , a Notary Public for the State of \•- )V-W I CClfoA vmG County of -The 6S0✓1 , do hereby certify that 1%P�liv-N I\-l..*ICA/ personally appeared before me this 1t41" day of kpY�1 202'1 and acknowledge the due execution of the 0 rations and Maintenance Agreement Aggreemeent. Witness my hand and official seal, C���:C_' _O ( ,H-tiri •'�CHAV �'� ' ;• iSSJo C�0• NOTARY ell 0 s �ber19 • 2. '' /o`SON CO' 'N My expirese(€alb e-✓ \C1, 2O21 Seal ��•"'��,,,,,,,,,,,,��`•`� commission s ,�rs ;r'� � ,:_' <-. � ;;b ' � ' -`" - �`a1, ��,z�/r,.:. sr„_,,,_F✓h:���isir,�.� w. s Important operation and maintenance procedures: - The drainage area will be carefully managed to reduce the sediment load to the infiltration basin. No portion of the infiltration basin will be fertilized after the initial fertilization that is requred to establish - the vegetation. Lime may be allowed if vegetation is planted on the surface of the infiltr ition basin and a soil test shows that it is needed. - The vegetation in and around the basin will be maintained at a height of four to six inc After the infiltration basin is established, it will be inspected quarterly and within 24 hours a ter every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and ma ntenance shall be kept in a known set location and shall be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be r paired immediately. SCM element: Potential problem: How to remediate the problem: The entire infiltration Trash/debris is present. Remove the trash/debris. basin Areas of bare soil and/or Regrade the soil if necessary to remov the gully, plant ground erosive gullies have cover and water until it is established. provide lime and a one- formed. time fertilizer application. The grass filter strip or other pretreatment area Sediment has accumulated Search for the source of the sediment itnd remedy the problem if to a depth of greater than possible. Remove the sediment and dispose of it in a location three inches. where it will not cause impacts to strec`ns or the SCM. The structure is clogged. Unclog the conveyance and dispose o any sediment in a The flow diversion location where it will not cause impact to streams or the SCM. structure (if applicable) Make any necessary repairs or replace if damage is too much for The structure is damaged. repair. The inlet pipe is clogged (if Unclog the pipe and dispose of any sediment in a location where applicable). it will not cause impacts to streams or ;he SCM. The inlet pipe is cracked or otherwise damaged (if Repair or replace the pipe. applicable). The inlet device Regrade the swale if necessary and p-ovide erosion control Erosion is occurring in the devices such as reinforced turf matting or riprap to avoid future swale (if applicable). erosion problems. Stone verge is clogged or Remove sediment and clogged stone and replace with clean covered in sediment(if stone. applicable). More than four inches of Search for the source of the sediment and remedy the problem if possible. Remove the sediment and dispose of it in a location sediment has accumulated. where it will not cause impacts to streams or the SCM. The basin Erosion of the basin Provide additional erosion protection such as reinforced turf surface has occurred or matting or riprap if needed to prevent future erosion problems. riprap is displaced. Water is standing more Replace the top few inches of soil to see if this corrects the than three days after a standing water problem. If not, consult an appropriate storm event. professional for a more extensive repair. Infiltration Basin Maintenance Requirements (continued) SCM element: Potential problem: How to remediate the problem: Shrubs or trees are growing on the Remove shrubs and trees immediately. embankment. The embankment An annual inspection by an appropriate professional Make needed repairs immediately. shows that the embankment needs repair. Clogging has occurred. Clean out the outlet device and dispose of sediment in a location where it will not cause impacts to streams or the SCM. The outlet device The outlet device is Repair or replace the outlet device. damaged Erosion or other signs of damage have occurred at Repair the damage and improve the flow dissipation structure. the outlet. The receiving water Discharges from the infiltration basin are causing erosion or Contact the local NCDEQ Regional Office. sedimentation in the receiving water. Infiltration Trench Maintenance Requirements Important operation and maintenance procedures: - The drainage area will be carefully managed to reduce the sediment load to the infiltration trench. _ The water level in the monitoring wells will be recorded once a month and after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County. The infiltration trench will be inspected once a quarter and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance shall be kept in a known set location and shall be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. SCM element: Potential problem: How to remediate the problem: The entire infiltration Trash/debris is present. Remove the trash/debris. trench Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then plant erosive gullies have a ground cover and water until it is established. Provide lime and formed. a one-time fertilizer application. The grass filter strip or other pretreatment area Sediment has accumulated Search for the source of the sediment and remedy the problem if to a depth of greater than possible. Remove the sediment and dispose of it in a location three inches. where it will not cause impacts to streams or the SCM. The structure is clogged. Unclog the conveyance and dispose of any sediment in a The flow diversion location where it will not cause impacts to streams or the SCM. structure (if applicable) The structure is damaged. Make any necessary repairs or replace if the damage is too much for repair. Water is ponding on the Remove the accumulated sediment from the top of the infiltration surface for more than 24 trench and dispose of it in a location that will not impact a stream hours after a storm. or the SCM. The trench Do not pull the weeds (may pull out media as well). Wipe them Grass or other plants are with a systemic herbicide such as glyphosate and then return growing on the surface of within the week to remove them by hand. (Another option is to the trench. pour boiling water on them or steam them.) Water present more than Clean out any clogged underdrain pipes. Consult an appropriate Observation well three days after a storm professional for clogged soil subgrade. event The emergency overflow Erosion or other signs of berm damage have occurred at Repair or replace the berm. the outlet. Erosion or other signs of damage have occurred at Repair the damage and improve the flow dissipation structure. the outlet. The receiving water Discharges from the infiltration trench are causing erosion or Contact the local NCDEQ Regional Office. sedimentation in the receiving water. • rryte4, ,is,'.. k_„cW,„h...✓ t,i,,,�...'. i ,�H 6rF.,suav,.,� Important operation and maintenance procedures: _ Immediately after the bioretention cell is established, the plants will be watered twice weekly if needed until the plants become established (commonly six weeks). - Snow, mulch or any other material will NEVER be piled on the surface of the bioretention cell. - Heavy equipment will NEVER be driven over the bioretention cell. - Special care will be taken to prevent sediment from entering the bioretention cell. - Once a year, a soil test of the soil media will be conducted. _ Remove top layer of fill media when the pool does not drain quickly. Based on the media specification, the pool should drain within 24 hours. After the bioretention cell is established, it will be inspected quarterly and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance shall be kept in a known set location and shall be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. SCM element: Potential problem: How to remediate the problem: The entire bioretention Trash/debris is present. Remove the trash/debris. cell The perimeter of the Areas of bare soil and/or Regrade the soil if necessary to remove the gully, plant ground T cell erosive gullies have cover and water until it is established. Provide lime and a one- bioretentionformed. time fertilizer application. The structure is clogged. Unclog the structure and dispose of any sediment off-site. The flow diversion structure (if applicable) The structure is damaged. Make any necessary repairs or replace if the damage is too much for repair. The inlet pipe is clogged (if Unclog the pipe and dispose of any sediment in a location where applicable). it will not cause impacts to streams or the SCM. The inlet pipe is cracked or otherwise damaged (if Repair or replace the pipe. applicable). The inlet device Regrade the swale if necessary and provide erosion control Erosion is occurring in the devices such as reinforced turf matting or riprap to avoid future swale (if applicable). erosion problems. Stone verge is clogged or Remove sediment and clogged stone and replace with clean covered in sediment(if stone. applicable). Flow is bypassing Regrade if necessary to route all flow to the pretreatment area. pretreatment area and/or Restabilize the area after grading. gullies have formed. Sediment has accumulated Search for the source of the sediment and remedy the problem if to a depth greater than possible. Remove the sediment and dispose of it in a location The pretreatment area three inches. where it will not cause impacts to streams or the SCM. Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. Bioretention Maintenance Requirements (continued) SCM element: Potential problem: How to remediate the problem: Best professional practices show that pruning is Prune according to best professional practices. Maintain lines of needed to maintain optimal sight between 2'-6'. plant health. Determine the source of the problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide a one- Bioretention cell Plants are dead, diseased time fertilizer application to establish the ground cover if a soil vegetation or dying. test indicates it is necessary. If sod was used, check to see that it was not grown on clay or impermeable soils. Replace sod if necessary. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. Tree stakes/wires are present six months after Remove tree stake/wires (which can kill the tree if not removed). planting. Spot mulch if there are only random void areas. Replace whole Mulch is breaking down or mulch layer if necessary. Remove the remaining mulch and has floated away. replace with triple shredded hard wood mulch at a maximum depth of four inches. Determine the extent of the clogging - remove and replace either Soils and/or mulch are just the top layers or the entire media as needed. Dispose of the Bioretention cell mulch spoil in an appropriate off-site location. Use triple shredded hard and media clogged with sediment. wood mulch at a maximum depth of four inches. Search for the source of the sediment and remedy the problem if possible. An annual soil test shows that pH has dropped or Dolomitic lime shall be applied as recommended per the soil test heavy metals have and toxic soils shall be removed, disposed of properly and accumulated in the soil replaced with new planting media. media. Clogging has occurred. Wash out the underdrain system. The underdrain, filter Clean out the drop inlet. Dispose of the sediment in a location fabric element, and outlet Clogging has occurred. where it will not cause impacts to streams or the SCM.. system The drop inlet is damaged Repair or replace the drop inlet. Erosion or other signs of damage have occurred at Repair the damage and improve the flow dissipation structure. the outlet. The receiving water Discharges from the bioretention cell are causing erosion or Contact the local NCDEQ Regional Office. sedimentation in the receiving water. Important operation and maintenance procedures: Immediately after the wet detention basin is established, the plants on the vegetated shelf and - perimeter of the basin should be watered twice weekly if needed, until the plants become established (commonly six weeks). _ No portion of the wet pond should be fertilized after the initial fertilization that is required to establish the plants on the vegetated shelf. _ Stable groundcover will be maintained in the drainage area to reduce the sediment load to the wet pond. _ If the pond must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain will be minimized as much as possible. _ At least once annually, a dam safety expert will inspect the embankment. Any problems that are found will be repaired immediately. _ The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. After the wet pond is established, it will be inspected quarterly and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance shall be kept in a known set location and shall be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. SCM element: Potential problem: How to remediate the problem: The entire wet pond Trash/debris is present. Remove the trash/debris. The perimeter of the wet Areas of bare soil and/or Regrade the soil if necessary to remove the gully, plant ground T erosive gullies have cover and water until it is established. Provide lime and a one- pondformed. time fertilizer application. The inlet pipe is clogged (if Unclog the pipe. Dispose of the sediment off-site. applicable). The inlet pipe is cracked or otherwise damaged (if Repair or replace the pipe. The inlet device applicable). Erosion is occurring in the Regrade the swale if necessary and provide erosion control swale (if applicable). devices such as reinforced turf matting or riprap to avoid future problems with erosion. Sediment has accumulated to a depth Search for the source of the sediment and remedy the problem greater than the original if possible. Remove the sediment and dispose of it in a location design depth for sediment where it will not cause impacts to streams or the SCM. storage. The forebay Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Remove the weeds, preferably by hand. If pesticide is used, Weeds are present. wipe it on the plants rather than spraying. Wet Pond Maintenance Requirements (Continued) SCM element: rPotential problem: How to remediate the problem: Sediment has accumulated to a depth Search for the source of the sediment and remedy the problem greater than the original if possible. Remove the sediment and dispose of it in a location design sediment storage where it will not cause impacts to streams or the SCM. depth. The main treatment area Algal growth covers over Consult a professional to remove and control the algal growth. 50% of the area. Cattails, phragmites or other invasive plants cover Remove the plants by wiping them with pesticide (do not spray). 50% of the basin surface. Best professional practices show that pruning is Prune according to best professional practices. needed to maintain optimal plant health. The vegetated shelf Determine the source of the problem: soils, hydrology, disease, Plants are dead, diseased etc. Remedy the problem and replace plants. Provide a one- or dying. time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. Shrubs have started to Remove shrubs immediately. grow on the embankment. Evidence of muskrat or Consult a professional to remove muskrats or beavers and beaver activity is present. repair any holes or erosion. The embankment A tree has started to grow Consult a dam safety specialist to remove the tree. on the embankment. An annual inspection by an appropriate professional shows that Make all needed repairs immediately. the embankment needs repair. Clogging has occurred. Clean out the outlet device and dispose of any sediment in a location where it will not cause impacts to streams or the SCM. The outlet device The outlet device is Repair or replace the outlet device. damaged. Weeds or volunteer trees Remove the weeds or trees. are growing on the mat. Floating wetland island (if applicable) The anchor cable is damaged, disconnected or Restore the anchor cable to its design state. missing. Wet Pond Maintenance Requirements (Continued) SCM element: Potential problem: How to remediate the problem: Erosion or other signs of damage have occurred at Repair the damage and improve the flow dissipation structure. the outlet. The receiving water Discharges from the wet pond are causing erosion Contact the local NCDEQ Regional Office. or sedimentation in the receiving water. �,. User Defined SCM Maintenance Requirements Section 1 Important operation and maintenance procedures: The system will be inspected at least quarterly. Records of operation and maintenance will be kept in a known set location and will be available upon request. Section 2 Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. SCM element: Potential problem: How to remediate the problem: OD Low Density Maintenance Requirements Important maintenance procedures: The drainage area to the vegetated conveyance or vegetated receiving area will be carefully managed to reduce the sediment load to the vegetated conveyance or vegetated receiving area. After the initial fertilization to establish the grass in the vegetated conveyance or the vegetated receiving area, fertilizer will not be applied to the vegetated receiving areas. The vegetated conveyance or vegetated receiving area will be inspected quarterly. Records of operation and maintenance will be kept in a known set location and will be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. SCM element: Potential problem: How to remediate the problem: Vegetation Vegetation is too short or Maintain grassed vegetation such that the swale or vegetated too long. area does not erode during the peak flow from the 10-year storm Trash/debris is present. Remove the trash/debris. Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then re- erosive gullies have sod (or plant with other appropriate species) and water until Vegetated receiving formed. established. Provide lime and a one-time fertilizer application. areas Trees and/or other woody Remove the trees and woody vegetation from the swale, regrade vegetation are present in the swale if necessary and re-establish grass as shown on the the swale. approved plans. Trash/debris is present. Remove the trash/debris. Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then re- erosive gullies have sod (or plant with other appropriate species) and water until formed. established. Provide lime and a one-time fertilizer application. Sediment covers the grass Remove sediment and dispose in an area that will not impact at the bottom of the swale. streams or SCMs. Re-sod if necessary. Vegetated conveyances I swales I roadside ditches Regrade the slopes to the permitted configuration per the (other than curb outlet The side slope is steeper approved plan and reestablish vegetation. If as-built or existing swales) than the approved conditions do not allow the slopes to be regraded, contact the configuration. applicable permitting agency. Determine the source of the problem: soils, hydrology, disease, Grass is dead, diseased or etc. Remedy the problem and replace plants. Provide a one- dying. time fertilizer application to establish the ground cover if necessary. Trees and/or other woody Remove the trees and woody vegetation from the vegetated vegetation are present in conveyance, regrade the vegetated conveyance if necessary and the vegetated conveyance. re-establish grass as shown on the approved plans. The longitudinal slope Regrade to meet the permitted longitudinal slope as shown on exceeds 5%. the approved plans. Curb outlet swales or The swale profile does not Regrade the swale to the approved profile as shown on the vegetated areas match the approved detail. approved plans. The length of the swale or Extend the swale to achieve the 100-foot minimum length. If as- vegetated area is less built or existing conditions do not allow the slopes to be than 100 feet. regraded, contact the applicable permitting agency. Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site. The outlet device (if applicable) The outlet device is Repair or replace the outlet device. damaged Erosion or other signs of damage have occurred at Repair the damage and improve the flow dissipation structure. the outlet. The receiving water Discharges from the site are causing erosion or Contact the local NCDEQ Regional Office. sedimentation in the receiving water. Dry Detention Pond Design Summary Dry Pond Diagram DRY POND ID FOREBAY MAIN POND Temporary Pool El: Temporary Pool El: Clean Out Depth: 0 Clean Out Depth: 0 Pretreatment Yes Sediment Storage El: Sediment Storage El: Has Veg. Filter Yes Bottom Elevation: Bottom Elevation: Wet Detention Pond Design Summary ova I ..a,.., WET POND ID FOREBAY MAIN POND Permanent Pool El. Permanent Pool El. Temporary Pool El: Temporary Pool El: Pretreatment other Clean Out Depth: 0 Clean Out Depth: 0 than forebay? No Sediment Removal El Sediment Removal El Has Veg. Filter? Bottom Elevation: Bottom Elevation: ATTACH ADDITIONAL SHEETS IF NECESSARY Stormwater Wetland Maintenance Requirements Important operation and maintenance procedures: _ Immediately following construction of the stormwater wetland, conduct bi-weekly inspections and water wetland plants bi-weekly until vegetation becomes established (commonly six weeks). _ Before and immediately after plant installation, monitor water level and adjust to ensure that plants are not completely inundated. No portion of the stormwater wetland will be fertilized after the initial fertilization that is required to - establish the wetland plants. - Stable groundcover will be maintained in the drainage area to reduce the sediment load to the wetland. At least once annually, a dam safety expert will inspect the embankment. Any problems that are found - will be repaired immediately. After the wetland is established, it shall be inspected quarterly and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance shall be kept in a known set location and shall be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. SCM element: Potential problem: How I will remediate the problem: The entire wetland Trash/debris is present. Remove the trash/debris. The perimeter of the Areas of bare soil and/or Regrade the soil if necessary to remove the gully, plant ground wetland erosive gullies have cover and water until it is established. Provide lime and a one- formed. time fertilizer application. The inlet pipe is clogged (if Unclog the pipe. Dispose of the sediment off-site. applicable). The inlet pipe is cracked or otherwise damaged (if Repair or replace the pipe. The inlet device applicable). Erosion is occurring in the Regrade the swale if necessary and provide erosion control swale (if applicable). devices such as reinforced turf matting or riprap to avoid future problems with erosion. Sediment has accumulated in the forebay to a depth of Search for the source of the sediment and remedy the problem if less than 15" or that possible. Remove the sediment and dispose of it in a location inhibits the forebay from where it will not cause impacts to streams or the SCM. functioning well. The forebay Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. Stormwater Wetland Maintenance Requirements (Continued) SCM element: Potential problem: How I will remediate the problem: A tree has started to grow If the tree is <6" in diameter, remove the tree. If the tree is >6" in on the embankment. diameter, consult a dam safety specialist to remove the tree. An annual inspection by an Embankment appropriate professional Make all needed repairs immediately. shows that the embankment needs repair. Evidence of muskrat or Consult a professional to remove muskrats or beavers and repair beaver activity is present. any holes or erosion. Algal growth covers over 30% of the deep pool and Consult a professional to remove and control the algal growth. shallow water areas. Cattails, phragmites or other invasive plants cover Remove the plants by hand or by wiping them with pesticide (do 30% of the deep pool and not spray) - consult a professional. shallow water areas. The temporary inundation zone remains flooded more Unclog the outlet device immediately. than 5 days after a storm event. Deep pool, shallow water Determine the source of the problem: soils, hydrology, disease, and shallow land areas Plants are dead, diseased etc. Remedy the problem and replace plants. Provide a one- or dying. time fertilizer application to establish the ground cover if necessary. Best professional practices show that pruning is Prune according to best professional practices. needed to maintain optimal plant health. Sediment has accumulated Search for the source of the sediment and remedy the problem if and reduced the depth to possible. Remove the sediment and dispose of it in a location 75% of the original design where it will not cause impacts to streams or the SCM. depth of the deep pools. Sediment has accumulated Search for the source of the sediment and remedy the problem if Micro pool and reduced the depth to possible. Remove the sediment and dispose of it in a location p 75% of the original design where it will not cause impacts to streams or the SCM. depth. Clogging has occurred. Clean out the outlet device. Dispose of the sediment in a location where it will not cause impacts to streams or the SCM. The outlet device The outlet device is Repair or replace the outlet device. damaged Stormwater Wetland Maintenance Requirements (Continued) SCM element: Potential problem: How I will remediate the problem: Erosion or other signs of damage have occurred at Repair the damage and improve the flow dissipation structure. the outlet. The receiving water Discharges from the wetland are causing Contact the local NCDEQ Regional Office. erosion or sedimentation in the receiving water. Sand Filter Maintenance Requirements Important operation and maintenance procedures: - Manage the drainage area to reduce the sediment load to the sand filter. - Clean out the sedimentation chamber or forebay whenever sediment depth exceeds six inches. - At least once a year, skim the sand media - Replace the sand filter media whenever it fails to function properly after maintenance. After the sand filter is established, it shall be inspected quarterly and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance shall be kept in a known set location and shall be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. SCM element: Potential problem: How to remediate the problem: Entire sand filter Trash/debris is present. Remove the trash/debris. Adjacent pavement (if Sediment is present on the Sweep or vacuum the sediment as soon as possible. applicable) pavement surface. Areas of bare soil and/or Regrade the soil if necessary to remove the gully, plant ground erosive gullies have cover and water until it is established. Provide lime and a one- The perimeter of the sand formed. time fertilizer application. filter Vegetation is too short or Maintain vegetation at an appropriate height. too long. The structure is clogged. Unclog the structure and dispose of sediment in a location where The flow diversion it will not cause impacts to streams or the SCM. structure (if applicable) Make any necessary repairs or replace if the damage is too The structure is damaged. much for repair. The inlet pipe is clogged (if Unclog the pipe and dispose of sediment in a location where it applicable). will not cause impacts to streams or the SCM. The inlet pipe is cracked or otherwise damaged (if Repair or replace the pipe. applicable). The inlet device Regrade the swale if necessary and provide erosion control Erosion is occurring in the devices such as reinforced turf matting or riprap to avoid future swale (if applicable). problems with erosion. Stone verge is clogged or Remove sediment and clogged stone and replace with clean covered in sediment(if stone. applicable). Sediment has accumulated Search for the source of the sediment and remedy the problem if to a depth of greater than possible. Remove the sediment and dispose of it in a location six inches. where it will not cause impacts to streams or the SCM. Sediment chamber (forebay) Provide additional erosion protection such as reinforced turf Erosion has occurred. matting or riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. If a pesticide is used, wipe it on the plants rather than spraying. Sand Filter Maintenance Requirements (continued) SCM element: Potential problem: How to remediate the problem: Sand chamber and Water is ponding on the Check to see if the collector system is clogged and flush if underdrain collection surface for more than 24 necessary. If water still ponds, remove the top few inches of filter system hours after a storm. bed media and replace. If water still ponds, then consult an appropriate professional. Clogging has occurred. Clean out the outlet device and dispose of sediment in a location where it will not cause impacts to streams or the SCM. The outlet device The outlet device is Repair or replace the outlet device. damaged. Erosion or other signs of damage have occurred at Repair the damage and improve the flow dissipation structure. the outlet. The receiving water Discharges from the sand filter are causing erosion or Contact the local NCDEQ Regional Office. sedimentation in the receiving water. Rainwater Harvesting Maintenance Requirements Important operation and maintenance procedures: _ The roof area will be maintained to reduce the debris and sediment load to the system. Excess debris can clog the system and lead to bypass of the design storm, and reduced reuse volume. _ To ensure proper operation as designed, a licensed Professional Engineer, Landscape Architect, or other qualified professional will inspect the system annually. - The system components will be repaired or replaced whenever they fail to function properly. - If the outlet is metered, use must be recorded at least monthly. These records shall be kept on site. After the system is installed, it shall be inspected monthly and within 24 hours after every storm event. Records of operation and maintenance shall be kept in a known set location and shall be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. SCM element: Potential problem: How to remediate the problem: A component of the system Make any necessary repairs or replace the system if damage is is damaged or leaking. too much for repair. Check system for clogging and damage. Repair as needed so The entire rainwater Water is flowing out of the the design volume is stored properly without discharging during a harvesting system overflow pipe during a design storm. design rainfall or smaller event when there has not Check that the pump is operating properly and that the water is been another rainfall event actually being used at the volume designed. during the past five days. If it is still not operating properly, then consult an appropriate professional. The captured roof area Excess debris or sediment Remove the debris or sediment as soon as possible. is present on the rooftop. Gutters are clogged, or Unclog and remove debris. Install gutter screens to prevent water is backing up out of future clogging if necessary. the gutter system. The gutter system Rooftop runoff is not Correct the positioning or installation of gutters. Replace if making it into gutter necessary to capture the roof runoff. system. Sediment accumulation of 5% or more of the design Remove sediment. volume. The cistern Algae growth is present Do not allow sunlight to penetrate the cistern. Treat the water to inside the cistern. remove/prevent algae. Mosquitoes are present in Check screens for damage and repair/replace them if necessary. the cistern. Treat with `mosquito dunks' if necessary. Debris and/or sediment Search for the source of the debris/sediment and remedy the The screens and filters has accumulated. problem if possible. Clean/clear debris/sediment from screen or Screens and filters are filter. Replace if it cannot be cleaned. clogged. The pump The pump is not operating Check to see if the system is clogged and flush if necessary. If it properly. is still not operating, then consult an appropriate professional. Rainwater Harvesting Maintenance Requirements (continued) SCM element: Potential problem: How to remediate the problem: Erosion is evident at the Stabilize immediately. overflow discharge point. The overflow pipe The overflow pipe is Unclog the pipe, or replace it if it cannot be unclogged. clogged. The outflow pipe is Repair or replace the pipe. damaged. The secondary water The secondary water The supply is not operating Consult an appropriate professional. properly. Dry Pond Maintenance Requirements Important operation and maintenance procedures: - The drainage area will be managed to reduce the sediment load to the dry pond. - Immediately after the dry pond is established, the vegetation will be watered twice weekly if needed until the plants become established (commonly six weeks). - After the initial fertilization to establish vegetation in the dry pond, fertilizer will not be applied to the dry pond. - The vegetation in and around the basin will be maintained at a height of approximately six inches. - At least once annually, a dam safety expert will inspect the embankment. Any problems that are found will be repaired immediately. After the dry pond is established, it shall be inspected quarterly and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance shall be kept in a known set location and shall be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. SCM element: Potential problem: How to remediate the problem: The entire SCM Trash/debris is present. Remove the trash/debris. Areas of bare soil and/or Regrade the soil if necessary to remove the gully, plant ground The perimeter of the SCM erosive gullies have cover and water until it is established. Provide lime and a one- formed. time fertilizer application. The inlet pipe is clogged (if Unclog the pipe. Dispose of the sediment in a location where it applicable). will not cause impacts to streams or the SCM. The inlet pipe is cracked or The inlet device otherwise damaged (if Repair or replace the pipe. applicable). Erosion is occurring in the Regrade the swale if necessary and provide erosion control swale (if applicable). devices such as reinforced turf matting or riprap to avoid future problems with erosion. Sediment has accumulated Search for the source of the sediment and remedy the problem if to a depth greater than the possible. Remove the sediment and dispose of it in a location original design depth for where it will not cause impacts to streams or the SCM. sediment storage. The forebay Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. Sediment has accumulated Search for the source of the sediment and remedy the problem if to a depth greater than the possible. Remove the sediment and dispose of it in a location original design depth for where it will not cause impacts to streams or the SCM. sediment storage. The main treatment area Water is standing more Check the outlet structure for clogging. If it is a design issue, than 5 days after a storm consult an appropriate professional. event. Weeds and noxious plants Remove the weeds, preferably by hand. If pesticide is used, are growing in the main wipe it on the plants rather than spraying. treatment area. Dry Pond Maintenance Requirements(continued) SCM element: Potential problem: How to remediate the problem: Shrubs have started to Remove shrubs immediately. grow on the embankment. Evidence of muskrat or Consult a professional to remove muskrats or beavers and repair beaver activity is present. any holes or erosion. The embankment A tree has started to grow Consult a dam safety specialist to remove the tree. on the embankment. An annual inspection by an appropriate professional Make all needed repairs immediately. shows that the embankment needs repair. Clogging has occurred. Clean out the outlet device. Dispose of the sediment in a location where it will not cause impacts to streams or the SCM. The outlet device The outlet device is Repair or replace the outlet device. damaged Erosion or other signs of damage have occurred at Repair the damage and improve the flow dissipation structure. the outlet. The receiving water Discharges from the dry pond are causing erosion Contact the local NCDEQ Regional Office. or sedimentation in the receiving water.