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HomeMy WebLinkAboutAgenda - 01-21-20 8-j - Orange County Sportsplex Field House Stormwater Control Measure Access and Maintenance Easement and Agreement with Town of Hillsborough (103 Meadowlands Drive, Hillsborough) 1 ORANGE COUNTY BOARD OF COMMISSIONERS ACTION AGENDA ITEM ABSTRACT Meeting Date: January 21, 2020 Action Agenda Item No. 8-j SUBJECT: Orange County Sportsplex Field House Stormwater Control Measure Access and Maintenance Easement and Agreement with Town of Hillsborough (103 Meadowlands Drive, Hillsborough) DEPARTMENT: Asset Management Services, County Attorney, Environment, Agriculture, Parks & Recreation ATTACHMENT(S): INFORMATION CONTACT: Stormwater Control Measure Access and Angel Barnes, Capital Projects Manager, Maintenance Easement and 919.245.2628 Agreement with Exhibit A — Steven Arndt, Asset Management Stormwater Control Measure Services Director, 919.245.2658 Operations and Maintenance Manual Travis Myren, Deputy County Manager, Exhibit B — StormFilter Inspection and 919.245.2308 Maintenance Procedures from Contech Engineered Solutions Exhibit C — Stormwater BMP Easement PURPOSE: To: 1) Approve a Stormwater Control Measure Access and Maintenance Easement and Agreement with the Town of Hillsborough for the Orange County Sportsplex Field House Stormwater Control Measures; and 2) Authorize the Chair to sign the necessary paperwork upon final County Attorney review. BACKGROUND: The Town of Hillsborough is requesting a Stormwater Control Measure Access and Maintenance Easement and Agreement for the Orange County Sportsplex Field House facility located at 103 Meadowlands Drive, Hillsborough. In 2018 the stormwater system was installed to meet the required standards. This agreement is to grant access to the stormwater control measures for required inspections. FINANCIAL IMPACT: There is no financial impact for granting this Stormwater Control Measure Access and Maintenance Easement and Agreement. SOCIAL JUSTICE IMPACT: There is no Orange County Social Justice Goal impact associated with this item. ENVIRONMENTAL IMPACT: The following Orange County Environmental Responsibility Goal impact is associated with this item: • RESULTANT IMPACT ON NATURAL RESOURCES AND AIR QUALITY 2 Assess and where possible mitigate adverse impacts created to the natural resources of the site and adjoining area. Minimize production of greenhouse gases. RECOMMENDATION(S): The Manager recommends that the Board 1) Approve the Stormwater Control Measure Access and Maintenance Easement and Agreement with the Town of Hillsborough for the Orange County Sportsplex Field House Stormwater Control Measures; and 2) Authorize the Chair to sign the necessary paperwork upon final County Attorney review. 3 Prepared by and Return to: Heather Fisher,AICP,Stormwater Coordinator,Town of Hillsborough Planning Department, Stormwater and Environmental Services Division, 101 East Orange Street,P.O.Box 429,Hillsborough, NC 27278 STATE OF NORTH CAROLINA STORMWATER CONTROL MEASURE COUNTY OF ORANGE EASEMENT AND MAINTENANCE AGREEMENT PINS: 9874-71-1038,9874-71-5479,9874-71-6466,and 9874-71-7383 This STORMWATER CONTROL MEASURE EASEMENT AND MAINTENANCE AGREEMENT("Easement and Agreement"),made this day of ,20 ,by Orange County,a North Carolina county,whose principal address is 200 South Cameron Street,P.O.Box 8181,Hillsborough,NC 27278 (hereafter"Grantor"),with,to,and for the benefit of the Town of Hillsborough,a municipal corporation of the State of North Carolina,whose address is 101 East Orange Street, P.O.Box 429,Hillsborough,NC 27278(hereinafter"Grantee"or"Town"). WITNESSETH: THAT WHEREAS,Grantor is the owner in fee simple of certain real properties situated in the Town of Hillsborough, Hillsborough Township,Orange County,North Carolina and more particularly described as follows: PIN 9874-71-1038: All of the 16.35 acres identified as"Lot 1"as shown on the plat and survey by PCA&Associates entitled"Property Surveyed for Orange Co. Community Athletic Corp."recorded in Plat Book 70,Page 178 of the Orange County Registry;and PINS 9874-71-5479,9874-71-6466,and 9874-71-7383: All of the 2.63 acres identified as"New Annexation Area All Lots"as shown on the plat and survey by Riley Surveying,P.A. entitled"Contiguous Annexation Map Lots 16-22 and a Portion of 15 C.P.Whitfield Farm Subdivision"recorded in Plat Book 116,Page 55 of the Orange County Registry (hereafter referred to as"Properties");and WHEREAS,the properties are located within the planning jurisdiction of the Town of Hillsborough,and are subject to certain requirements set forth in the UDO(Unified Development Ordinance)of the Town,(hereafter"Hillsborough UDO"),as such may be amended from time to time;and Page 1 of 3 4 WHEREAS,one of the conditions for development of the Properties is the granting or dedication of a Stormwater Control Measure easement("hereafter SCM Easement"),which includes the implementation of certain stormwater practices such as,but not limited to,the construction,operation and maintenance of engineered stormwater control measure(s)as provided by the Hillsborough UDO;the dedication of an access easement for inspection and maintenance of the SCM easement areas and engineered structures;and the assumption by Grantor of certain specified maintenance and repair responsibilities;and WHEREAS,this Easement and Agreement has been procured in accordance with the requirements of NCGS Section 143- 211 et. seq.and Section 6(Development Standards),Article 6.20(Stormwater Management)of the Hillsborough UDO. NOW,THEREFORE,for a valuable consideration,including the benefits Grantor may derive therefrom,the receipt of which is hereby acknowledged,Grantor has dedicated,bargained and conveyed and by these presents does hereby dedicate,bargain, sell, grant and convey unto the Grantee,its successors and assigns,a perpetual,and irrevocable right and easement in,on,over,under, through and across the Properties(1)for an SCM easement of the nature and character and to the extent hereinafter set forth,more particularly shown,described and identified as"20'SCM Access&Maintenance Easement"and"SCM Access&Maintenance Easement(Variable Width)"as shown on the plat and survey entitled"Dedication of SCM Access&Maintenance Easement and Public Pedestrian Sidewalk Easement"by Riley Surveying,P.A. in Plat Book 120,Page 161 of the Orange County Registry,which which is incorporated herein by reference and made a part of this document;upon which Grantor shall construct,maintain,repair and reconstruct stormwater control measure(s),including detention pond(s),pipes and water control structures,berms and dikes,and shall establish and maintain vegetative filters and groundcovers;and(2)an access easement more particularly shown and described on the Plat herein referenced,for the purpose of permitting Town inspection and,if necessary,maintenance and repair of the SCM easement areas and engineered structure(s)as more fully set forth herein and in the Hillsborough UDO. The terms,conditions,and restrictions of the Easement and Agreement are: 1. Grantor represents and warrants that Grantor is financially responsible for construction,maintenance,repair and replacement of all stormwater control measures,appurtenances and vegetation,including the impoundment.Grantor agrees to perform the maintenance as outlined in the Stormwater Control Measure Operation and Maintenance Manual attached hereto as Exhibit A and in consideration of the Certificate of Compliance with stormwater regulations received for Properties. 2. If Grantor fails to comply with these requirements,or any other obligations imposed herein,in the Hillsborough UDO, Stormwater Management Plan Approval,or Stormwater Control Measure Operation and Maintenance Manual,the Town may perform such work as Grantor is responsible for and recover the costs thereof from the Grantor. 3. This Easement and Agreement gives the Grantee the following affirmative rights: Grantee,its officers,employees, and agents may enter the SCM Easement whenever reasonably necessary for the purpose of inspecting same to determine compliance herewith,to maintain same and make repairs or replacements to the engineered stormwater control measure(s)and appurtenances and conditions as may be necessary or convenient thereto in the event the Grantor defaults in its obligations and to recover from the Grantor the cost thereof,and in addition to other rights and remedies available to it,to enforce by proceedings at law or in equity the rights,covenants,duties,and other obligations herein imposed. 4. The Grantee is under no obligation to maintain or repair the above referenced facilities,and in no event shall this Easement and Agreement be construed to impose any such obligation on the Town. 5. The Grantee shall not be liable to any person for the condition or operation of the above referenced facilities. 6. The Grantor and the Grantor's heirs,administrators,executors,assigns and any other successor in interest shall indemnify and hold harmless the Grantee and its officers,agents and employees for any and all damages,accidents, casualties,occurrences,claims or attorney's fees which might arise or be asserted,in whole or in part,against the Grantee from the construction,presence,existence,or maintenance of the stormwater control facilities subject to the Agreement.In the event a claim is asserted against the Grantee,its officers,agents or employees,the Grantee shall notify the Grantor and the Grantor shall defend at the Grantor's expense any suit based on such claim.If any judgment or claims against the Town,its officers,agents or employees shall be allowed,the Grantor shall pay the same all costs and expenses in connection therewith.The Grantee will not indemnify,defend or hold harmless in any fashion the Grantor from any claims arising from any failure,regardless of any language in any attachment or other document that the Grantor may provide. 7. This agreement shall not in any way diminish,limit,or restrict the right of the Town to enforce any of its ordinances as authorized by law. Page 2 of 3 5 The Grantor shall in all other respects remain the fee owner of the Property and area subject to this Easement and Agreement and may make all lawful uses of the Property not inconsistent with this Easement and Agreement. The Grantee does not waive or forfeit the right to take action to ensure compliance with the terms,conditions and purposes of this Easement and Agreement by a prior failure to act. The Grantor agrees that the terms,conditions and restrictions of this Easement and Agreement will be promptly recorded by Grantor in the Orange County Registry. The designation Grantor and Grantee shall include the parties,their heirs,successors and assigns. TO HAVE AND TO HOLD the aforesaid rights,privileges,and easement herein granted to the Grantee,its successors and assigns forever and the same Grantor does covenant that Grantor is seized of said premises in fee and has the right to convey the same, that except as set forth below the same is free from encumbrances and that Grantor will warrant and defend the said title to the same against claims of all persons whosoever. The covenants agreed hereto and the conditions imposed herein shall be binding upon the Grantor and its agents,personal representatives,heirs and assigns,and all other successors in interest to Grantor and shall continue as a servitude running in perpetuity with the above described land. IN WITNESS WHEREOF,the Grantor has caused this instrument to be signed in its name,the day and year first above written. Orange County,a North Carolina county By: Penny Rich Chair,Orange County Board of Commissioners STATE OF NORTH CAROLINA COUNTY OF I, ,a Notary Public of the County and State aforesaid,certify that Penny Rich,Chair of the Orange County Board of Commissioners,Grantor,personally appeared before me this day and acknowledged the execution of the foregoing instrument. WITNESS my hand and notarial seal,this the day of ,20 Notary Public My commission expires: 20 Page 3 of 3 6 EXHIBIT A STORMWATER CONTROL MEASURE OPERATION AND MAINTENANCE MANUAL STORMWATER MANGEMENT SW2018-36 PLAN PROJECT NUMBER: NAME OF PROJECT: Orange County Sportsplex Field House Addition DESCRIPTION OF PROJECT The Project consists of an expansion of an existing recreation complex including a field house building,artificial turf field,parking areas,utilities,and stormwater management facilities,including one Contech StormFilter device and a bioretention cell.The Project also includes the modification of the existing pond outlet to provide additional water quality treatment.The SCMs are identified on the approved Construction Drawings entitled"Orange County Sportsplex Field House Addition"with a latest revision date of October 15, 2018 for the project as"Storm Trap Filter Vault,""Biocell#2,"and"Pond."A copy of the approved plans for the project is on file with the Town of Hillsborough Planning Department. OWNER CONTACT INFORMATION Owner: Orange County Point of Contact Name: Bonnie B.Hammersley Point of Contact Title: County Manager Mailing Address: 200 South Cameron Street,P.O. Box 8181,Hillsborough,NC 27278 Phone Number: (919)245-2300 OPERATION AND MAINTENANCE CONDITIONS The property owner shall keep a separate maintenance record on each of the SCMs.These maintenance records shall be kept in a log in a known set location on the project site.Any deficient SCM elements noted in the inspections shall be corrected,repaired or replaced immediately. These deficiencies can affect the integrity of structures,safety of the public,and the removal efficiency of the SCMs. Storm Trap Filter Vault(Contech StormFilter) Location: PIN9874-71-1038 Important operation and maintenance procedures: _ The drainage area will be carefully managed to reduce the sediment load to the StormFilter. _ The sedimentation chamber or forebay will be cleaned out whenever sediment depth exceeds six inches. The StormFilter system will be inspected quarterly.Records of operation and maintenance will be kept in a known set location and a copy will be provided with the annual inspection report. As the primary reference for operation and maintenance procedures,use Contech's StormFilter Inspection and Maintenance Procedures document attached to this agreement(Exhibit B). In addition to Contech's StormFilter Inspection and Maintenance Procedures(Exhibit B),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: Page 1 of 6 7 Entire SCM Maintenance need identified Follow Contech's StormFilter Inspection and based on Contech's Maintenance Procedures document. Cartridges StormFilter Inspection and will need to be replaced periodically(see Maintenance Procedures Stormfilter Cartridges below).Periodic sediment document. removal will also be required. Adjacent pavement Trash/debris is present. Remove the trash/debris. (if applicable) Flow diversion structure Sediment is present on the Sweep or vacuum the sediment as soon as pavement surface. possible. StormFilter Cartridges Cartridge replacement need Follow Contech's StormFilter Inspection and identified based on Contech's Maintenance Procedures document. Cartridges StormFilter Inspection and will need to be replaced periodically. Maintenance Procedures document. The structure is clogged. Unclog the conveyance and dispose of any sediment offsite. The structure is damaged. Make any necessary repairs or replace if damage is too large for repair. Mosquitoes are breeding in Check that all structures are sealed properly and the chamber/pipe and causing that all covers are tight fitting.Repair broken a nuisance. seals,gaps,and openings that are greater than 1/16 inch.Use gaskets where appropriate and feasible. Consult with a registered Professional Engineer to determine methods for reducing mosquito breeding surface area within the system. Outlet device Clogging has occurred. Clean out the outlet device.Dispose of the sediment offsite. The outlet device is damaged. Repair or replace the outlet device. Receiving water Erosion or other signs of Contact the Town of Hillsborough Stormwater damage have occurred at the and Environmental Services Division:PO Box outlet. 429,Hillsborough,NC 27278;919-296-9622 All other operation and maintenance activities should be in accordance with Contech's StormFilter Inspection and Maintenance Procedures document(Exhibit B).Any problems that are found shall be repaired immediately.The responsible party shall have received and understand Contech's StormFilter Inspection and Maintenance Procedures document. Page 2 of 6 8 Biocell(Bioretention Cell) Location: PIN9874-71-7383 Important operation and maintenance procedures: • Immediately after the bio-retention cell is established,the plants will be watered twice weekly if needed until the plants become established(commonly 6 weeks). • Snow,mulch or any other material will NEVER be piled on the surface of the bio-retention cell.Heavy equipment will NEVER be driven over the bio-retention cell. • Wheeled or tracked equipment will NEVER be driven over the bioretention planting surface. • Special care will be taken to prevent sediment from entering the bioretention cell. • If standing water is present 2 days after rainfall,conduct an infiltration test of the soil media. After the bioretention cell is established,inspect it quarterly. Inspection activities shall be performed as follows and maintenance activities shall commence immediately to remediate any problems observed per the table below. SCM element: Potential problem: How to remediate the problem: The entire SCM Trash/debris is present. Remove the trash/debris. The perimeter of the SCM Areas of bare soil and/or erosive Regrade the soil to remove the gully,and plant a gullies have formed. ground cover and water until it is established. Provide lime and a one-time fertilizer application. Vegetation is too short or too long. Maintain vegetation at a height of approximately six inches. The inlet device The pipe is clogged. Unclog the pipe. Dispose of the sediment off-site. The pipe is cracked or otherwise Replace the pipe. damaged. Erosion is occurring in the swale. Regrade the swale to smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems. Stone verge is clogged or covered Remove sediment and replace with clean stone. in sediment(if applicable). The pretreatment area Flow is bypassing pretreatment Regrade if necessary to route all flow to the area and/or gullies have formed. pretreatment area. Restabilize the area after grading. Sediment has accumulated to a Search for the source of the sediment and remedy depth greater than three inches. the problem if possible. Remove the sediment and restabilize the pretreatment area. 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. Page 3 of 6 9 SCM element: Potential problem: How to remediate the problem: The bioretention cell: vegetation Best professional practices show Prune according to best professional practices and that pruning is needed to maintain to maintain lines-of-sight and allow sunlight to optimal plant health. reach the mulch surface. Plants are dead,diseased or dying. Determine the source of the problem: soils, hydrology,disease,etc. Remedy the problem and replace plants. Provide a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Tree stakes/wires are present six Remove tree stake/wires(which can kill the tree if months after planting. not removed). The bioretention cell: Mulch is breaking down or has Spot mulch if there are only random void areas. soils and mulch floated away. Replace whole mulch layer if necessary. Remove the remaining much and replace with triple shredded hard wood mulch at a maximum depth of three inches. Soils and/or mulch are clogged Determine the extent of the clogging-remove and with sediment. replace either just the top layers or the entire media as needed.Dispose of the spoil in an appropriate off-site location. Use triple shredded hard wood mulch at a maximum depth of three inches. Search for the source of the sediment and remedy the problem if possible. An annual soil test shows that pH Dolomitic lime shall be applied as recommended has dropped or heavy metals have per the soil test and toxic soils shall be removed, accumulated in the soil media. disposed of properly and replaced with new planting media. The underdrain system Clogging has occurred. Wash out the underdrain system. (if applicable) The drop inlet Clogging has occurred. Clean out the drop inlet. Dispose of the sediment off-site. The drop inlet is damaged Repair or replace the drop inlet. The receiving water Erosion or other signs of damage Contact the Town of Hillsborough Stormwater and have occurred at the outlet. Environmental Services Division at 919-296-9622 Page 4 of 6 10 Pond(Wet Detention Basin) Location: PIN9874-71-1038 This system does not incorporate vegetated filters at the outlets. This system does not incorporate pre-treatment and does not have a forebay. Important operation and maintenance procedures: • No portion of the wet detention pond should be fertilized except for a one-time fertilization,if necessary,to establish vegetation after maintenance work. • Stable groundcover shall be maintained in the drainage area to reduce the sediment load to the wet detention basin. • If the basin must be drained for an emergency or to perform maintenance,the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. • Once a year,a dam safety expert shall inspect the embankment. After the wet detention pond is established,it shall be inspected once a month and within 24 hours after every storm event greater than 1.0 inches.Records of operation and maintenance shall be kept in a known set location on the project site and shall be made available upon request. Inspection activities shall be performed as follows.Any problems that are found shall be repaired immediately. SCM Element: Potential Problem: How Property Owner Will Remediate the Problem: The Entire SCM Trash/Debris is present. Remove the trash/debris The Perimeter of the Wet Areas of bare soil and/or erosive gullies Re-grade the soil if necessary to remove the Detention Basin have formed. gully,and then plant a ground cover and water until it is established.Provide lime and a one- time fertilizer application. Vegetation is too short or too long. Maintain vegetation at a height of approximately 6 inches. The Inlet Device: Pipe or Swale The pipe is clogged. Unclog the pipe.Dispose of the sediment off- site. The pipe is cracked or otherwise Replace the pipe. damaged. Erosion is occurring in the Swale. Re-grade the swale if necessary to smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. The Main Treatment Area Algal growth covers over 50%of the Consult a professional to remove and control area. the algal growth. Cattails,phragmites or other invasive Have a licensed aquatic pesticide applicator plants cover 50%of the basin surface. treat the weeds by wiping aquatic glyphosate on the leaves rather than spraying. Sinkholes have formed. Consult with a professional engineer to identify the source of the problem and complete the necessary repairs. The Outlet Device Clogging has occurred. Clean out the outlet device.Dispose of the sediment off-site. The outlet device is damaged. Repair or replace the outlet device. Page 5 of 6 11 SCM Element: Potential Problem: How Property Owner Will Remediate the Problem: The Embankment Shrubs have started to grow on the Remove shrubs immediately. embankment. Evidence of muskrat or beaver activity is Consult a professional to remove muskrats and present. beavers. A tree has started to grow on the Consult a dam safety specialist to remove the embankment. tree. An annual inspection by an appropriate Make all needed repairs. professional shows that the embankment needs repair(if applicable). The Receiving Water Erosion or other signs of damage have Contact the Town of Hillsborough Stormwater occurred at the outlet. and Environmental Services Division:PO Box 429,Hillsborough,NC 27278;919-296-9622 Page 6 of 6 12 Ci5:: N T E C H" Exhibit B ENGINEERED SOLUTIONS StormFilter Inspection and Maintenance Procedures 1 �♦ N. The Stormwater Management +� StormFilter 13 Maintenance Guidelines In addition to these two activities, it is important to check The primary purpose of the Stormwater Management the condition of the StormFilter unit after major storms for StormFilter®is to filter and prevent pollutants from entering our potential damage caused by high flows and for high sediment waterways. Like any effective filtration system, periodically these accumulation that may be caused by localized erosion in the pollutants must be removed to restore the StormFilter to its full drainage area. It may be necessary to adjust the inspection/ maintenance schedule depending on the actual operating efficiency and effectiveness. conditions encountered by the system. In general, inspection Maintenance requirements and frequency are dependent on the activities can be conducted at any time, and maintenance should pollutant load characteristics of each site. Maintenance activities occur, if warranted, during dryer months in late summer to early may be required in the event of a chemical spill or due to fall. excessive sediment loading from site erosion or extreme storms. It is a good practice to inspect the system after major storm events. Maintenance Frequency The primary factor for determining frequency of maintenance for Maintenance Procedures the StormFilter is sediment loading. Although there are many effective maintenance options,we A properly functioning system will remove solids from water by believe the following procedure to be efficient, using common trapping particulates in the porous structure of the filter media equipment and existing maintenance protocols.The following inside the cartridges.The flow through the system will naturally two-step procedure is recommended:: decrease as more and more particulates are trapped. Eventually 1. Inspection the flow through the cartridges will be low enough to require • Inspection of the vault interior to determine the need for replacement. It may be possible to extend the usable span of the maintenance. cartridges by removing sediment from upstream trapping devices 2. Maintenance on a routine as-needed basis, in order to prevent material from being re-suspended and discharged to the StormFilter treatment • Cartridge replacement system. • Sediment removal The average maintenance lifecycle is approximately 1-5 years. Inspection and Maintenance Timing Site conditions greatly influence maintenance requirements. At least one scheduled inspection should take place per year with StormFilter units located in areas with erosion or active maintenance following as warranted. construction may need to be inspected and maintained more often than those with fully stabilized surface conditions. First, an inspection should be done before the winter season. During the inspection the need for maintenance should be Regulatory requirements or a chemical spill can shift maintenance determined and, if disposal during maintenance will be required, timing as well.The maintenance frequency may be adjusted as samples of the accumulated sediments and media should be additional monitoring information becomes available during the obtained. inspection program.Areas that develop known problems should be inspected more frequently than areas that demonstrate no Second, if warranted, a maintenance(replacement of the filter problems, particularly after major storms. Ultimately, inspection cartridges and removal of accumulated sediments)should be and maintenance activities should be scheduled based on the performed during periods of dry weather. historic records and characteristics of an individual StormFilter system or site. It is recommended that the site owner develop a database to properly manage StormFilter inspection and maintenance programs.. 14 Maintenance Decision Tree The need for maintenance is typically based on results of the inspection. The following Maintenance Decision Tree should be used as J a general guide.(Other factors,such as Regulatory Requirements, may =.;. need to be considered) 1. Sediment loading on the vault floor. a. If >4"of accumulated sediment, maintenance is req u i red. 2. Sediment loading on top of the cartridge. a. If >1/4"of accumulation, maintenance is required. 3. Submerged cartridges. :44. a. If >4"of static water above cartridge bottom for more than 24 hours after end of rain event, maintenance • is required. (Catch basins have standing water in the cartridge bay.) Inspection Procedures 4. Plugged media. The primary goal of an inspection is to assess the condition of a. If pore space between media granules is absent, the cartridges relative to the level of visual sediment loading as maintenance is required. it relates to decreased treatment capacity. It may be desirable to conduct this inspection during a storm to observe the relative 5. Bypass condition. flow through the filter cartridges. If the submerged cartridges a. If inspection is conducted during an average rain fall are severely plugged,then typically large amounts of sediments event and StormFilter remains in bypass condition will be present and very little flow will be discharged from the (water over the internal outlet baffle wall or submerged drainage pipes. If this is the case,then maintenance is warranted cartridges), maintenance is required. and the cartridges need to be replaced. 6. Hazardous material release. Warning: In the case of a spill,the worker should abort a. If hazardous material release(automotive fluids or other) inspection activities until the proper guidance is obtained. is reported, maintenance is required. Notify the local hazard control agency and Contech Engineered Solutions immediately. 7. Pronounced scum line. To conduct an inspection: a. If pronounced scum line(say ? 1/4"thick) is present above top cap, maintenance is required. Important: Inspection should be performed by a person who is familiar with the operation and configuration of the StormFilter treatment unit. 1. If applicable, set up safety equipment to protect and notify surrounding vehicle and pedestrian traffic. 2. Visually inspect the external condition of the unit and take f notes concerning defects/problems. "4 3. Open the access portals to the vault and allow the system vent. 4. Without entering the vault,visually inspect the inside of the unit, and note accumulations of liquids and solids. 5. Be sure to record the level of sediment build-up on the floor of the vault, in the forebay, and on top of the cartridges. If flow is occurring, note the flow of water per drainage pipe. Record all observations. Digital pictures are valuable for historical documentation. 6. Close and fasten the access portals. 7. Remove safety equipment. 8. If appropriate, make notes about the local drainage area relative to ongoing construction, erosion problems, or high loading of other materials to the system. 9. Discuss conditions that suggest maintenance and make decision as to weather or not maintenance is needed. 15 Maintenance Depending on the configuration of the particular system, maintenance personnel will be required to enter the vault to perform the maintenance. Important: If vault entry is required, OSHA rules for confined space entry must be followed. Filter cartridge replacement should occur during dry weather. It may be necessary to plug the filter inlet pipe if base flows is occurring. Replacement cartridges can be delivered to the site or customers facility. Information concerning how to obtain the replacement - cartridges is available from Contech Engineered Solutions. Warning: In the case of a spill,the maintenance personnel should abort maintenance activities until the proper guidancek is obtained. Notify the local hazard control agency and ; . Contech Engineered Solutions immediately. ry. To conduct cartridge replacement and sediment removal maintenance: 1. If applicable, set up safety equipment to protect maintenance personnel and pedestrians from site hazards. 2. Visually inspect the external condition of the unit and take notes concerning defects/problems. 3. Open the doors(access portals)to the vault and allow the ^•:_ system to vent. 4. Without entering the vault, give the inside of the unit, Important:Care must be used to avoid damaging the including components, a general condition inspection. cartridges during removal and installation.The cost of 5. Make notes about the external and internal condition of repairing components damaged during maintenance will be the vault. Give particular attention to recording the level of the responsibility of the owner. sediment build-up on the floor of the vault, in the forebay, C. Set the used cartridge aside or load onto the hauling and on top of the internal components. truck. 6. Using appropriate equipment offload the replacement cartridges(up to 150 lbs. each)and set aside. D. Continue steps a through c until all cartridges have been 7. Remove used cartridges from the vault using one of the removed. following methods: Method 2: Method 1: A. This activity will require that maintenance personnel enter A. This activity will require that maintenance personnel enter the vault to remove the cartridges from the under drain the vault to remove the cartridges from the under drain manifold and place them under the vault opening for manifold and place them under the vault opening for lifting (removal). Disconnect each filter cartridge from the lifting (removal). Disconnect each filter cartridge from the underdrain connector by rotating counterclockwise 1/4 of underdrain connector by rotating counterclockwise 1/4 of a turn. Roll the loose cartridge, on edge,to a convenient a turn. Roll the loose cartridge, on edge,to a convenient spot beneath the vault access. spot beneath the vault access. B. Unscrew the cartridge cap. Using appropriate hoisting equipment, attach a cable C. Remove the cartridge hood and float. from the boom, crane, or tripod to the loose cartridge. Contact Contech Engineered Solutions for suggested D. At location under structure access,tip the cartridge on its attachment devices. side. B. Remove the used cartridges(up to 250 lbs. each)from the E. Empty the cartridge onto the vault floor. Reassemble the vault. empty cartridge. F Set the empty, used cartridge aside or load onto the hauling truck. G. Continue steps a through a until all cartridges have been removed. 16 8. Remove accumulated sediment from the floor of the Material Disposal vault and from the forebay.This can most effectively be The accumulated sediment found in stormwater treatment accomplished by use of a vacuum truck. and conveyance systems must be handled and disposed of in 9. Once the sediments are removed, assess the condition of the accordance with regulatory protocols. It is possible for sediments vault and the condition of the connectors. to contain measurable concentrations of heavy metals and 10.Using the vacuum truck boom, crane, or tripod, lower and organic chemicals(such as pesticides and petroleum products). install the new cartridges. Once again,take care not to Areas with the greatest potential for high pollutant loading damage connections. include industrial areas and heavily traveled roads. 11.Close and fasten the door. Sediments and water must be disposed of in accordance with 12.Remove safety equipment. all applicable waste disposal regulations.When scheduling 13.Finally, dispose of the accumulated materials in accordance maintenance, consideration must be made for the disposal of with applicable regulations. Make arrangements to return the solid and liquid wastes.This typically requires coordination with used emote cartridges to Contech Engineered Solutions. a local landfill for solid waste disposal. For liquid waste disposal a number of options are available including a municipal vacuum truck decant facility, local waste water treatment plant or on-site treatment and discharge. Related Maintenance Activities - Performed on an as-needed basis StormFilter units are often just one of many structures in a more comprehensive stormwater drainage and treatment system. In order for maintenance of the StormFilter to be successful, it is imperative that all other components be properly maintained. The maintenance/repair of upstream facilities should be carried out prior to StormFilter maintenance activities. In addition to considering upstream facilities, it is also important to correct any problems identified in the drainage area. Drainage area concerns may include: erosion problems, heavy oil loading, and discharges of inappropriate materials. s - 17 Inspection Report Date: Personnel: Location: System Size: System Type: Vault ❑ Cast-In-Place ❑ Linear Catch Basin ❑ Manhole ❑ Other ❑ Date: Sediment Thickness in Forebay: Sediment Depth on Vault Floor: Structural Damage: Estimated Flow from Drainage Pipes(if available): Cartridges Submerged: Yes ❑ No ❑ Depth of Standing Water: StormFilter Maintenance Activities(check off if done and give description) ❑ Trash and Debris Removal: ❑ Minor Structural Repairs: ❑ Drainage Area Report Excessive Oil Loading: Yes ❑ No ❑ Source: Sediment Accumulation on Pavement: Yes ❑ No ❑ Source: Erosion of Landscaped Areas: Yes ❑ No ❑ Source: Items Needing Further Work: Owners should contact the local public works department and inquire about how the department disposes of their street waste residuals. Other Comments: Review the condition reports from the previous inspection visits. 18 StormFilter Maintenance Report Date: Personnel: Location: System Size: System Type: Vault ❑ Cast-In-Place ❑ Linear Catch Basin ❑ Manhole ❑ Other ❑ List Safety Procedures and Equipment Used: System Observations Months in Service: Oil in Forebay(if present): Yes ❑ No ❑ Sediment Depth in Forebay(if present): Sediment Depth on Vault Floor: Structural Damage: Drainage Area Report Excessive Oil Loading: Yes ❑ No ❑ Source: Sediment Accumulation on Pavement: Yes ❑ No ❑ Source: Erosion of Landscaped Areas: Yes ❑ No ❑ Source: StormFilter Cartridge Replacement Maintenance Activities Remove Trash and Debris: Yes ❑ No ❑ Details: Replace Cartridges: Yes ❑ No ❑ Details: Sediment Removed: Yes ❑ No ❑ Details: Quantity of Sediment Removed (estimate?): Minor Structural Repairs: Yes ❑ No ❑ Details: Residuals(debris, sediment) Disposal Methods: N otes: 19 y RECYCLES `K PAPER Ow NTECH' ENGINEERED SOLUTIONS ©2016 CONTECH ENGINEERED SOLUTIONS LLC. 800-338-1 122 www.ContechES.com All Rights Reserved. Printed in the USA. 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 on other Contech division offerings,visit contech-cpi.com or call 800.338.1 122. Support • Drawings and specifications are available at www.conteches.com. • Site-specific design support is available from our engineers. NOTHING IN THIS CATALOG SHOULD BE CONSTRUED AS AN EXPRESSED WARRANTY OR AN IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR AN Y PARTICULAR PURPOSE. SEE THE CONTECH STANDARD CONDITIONS OF SALE(VIEWABLE AT WWW.CONTECHES.COM/COS) FOR MORE INFORMATION . 800.338.1122 StormFilter Inspection and Maintenance Procedures 8/2016 www.conteches.com 20 EXHIBIT C � xx PUBLICPEOESTRIANSIOEWALKEAS<3ffN! % '>0 1J %\ \\ I 1 SCMACCESS B MAMTENUCEEMEM T �/ a / 117 bra L PRELIMINARY .17 Z%T DEDICATION OF �J1111O� SCMACCESS&MAINTENANCE EASEMENTAND PUBLIC PEDESTRIAN SIDEWALK EASEMENT PROPERTIESOF / —--— 1 q Nr ORANGE COUNTY r� � fll-TTTTTTTTI HILLSBOROUGH TOWNSHIP,ORANGECOUNTY GOF R­"` RILEY SURIEYINGP.A. NORTH CAROLINA OI,flHM1.NC YTPoI ItBI di'+Mw/roH�cvm