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Home My WebLink AboutSW3170803 - Reafield (2)TRANSMITTAL URBAN DESIGN PARTNERS To: Rick Riddle NCDEMLR SW Permitting Prog 1612 Mail Service Center Raleigh, NC 27699-1612 Phone: 919-807-6375 Fax: Transmitted Via: ❑ Overnight ❑ Courier ❑ Hand ® Mail ❑ Fax 1318 e-6 central avenue P 704 334.3303 charlotte, nc 28205 F 704 334 3305 Date: 8/22/2017 Project Name: Reafield Project No: 16-115 Action: M For Approval ❑ For Your Use ❑ As Requested ❑ For Review & Comment ❑ For Signature Number Date Description 2 Stormwater Permit Applications 1 Supplemental Form & O&M Agreement 1 Fee Check 1 Summary & USGS Map 2 Calc books 2 Full set of plans 1 Copy of deed 1 Corporation documentation Comments Rick, This package includes all of the documentation for the Stormwater Management Permit Application for Reafield. Please let us know if you have any questions or comments. Thank you, Lauren Thomas 704.334.3303 x 105 lauren@urbandesignpartners.com Cc: �r�RMWATER Pa�iv11 njNG STORMWATER MANAGEMENT SUMMARY FOR REARELD Rea Road Union County, NC 4 George Macon Reafield, LLC 2400 South Blvd Suite 300 Charlotte, NC 28203 Date: 08.18.17 Project No: 16-115 DEVELOPMENT SUMMARY The site is located on Rea Road in Union County, NC, roughly 0.4 miles northwest of the intersection of Rea Road and Tom Short Road. The 8.68 -acre site currently consists of open vegetated area with some trees and is zoned as PUDE-B2. The adjacent parcels are a single-family residential subdivision, a day care, and an undeveloped parcel. McBride Branch runs along the southwest property line and the entire site is sloped downward from the roadway towards the creek. PROPOSED DEVELOPMENT The proposed development of the site includes four commercial buildings and associated parking lots. The estimated build -upon area, including the concrete, asphalt, and buildings, is 71.6%, based on the drainage area of 4.3 -acres. The storm drainage system will be installed in order to capture all on-site runoff and route the stormwater to the sand filter dry detention pond. The pond has been designed to treat the 1 -inch water quality volume and attenuate the 10- and 25 -year peak flow rate. The stormwater will then be discharged along the existing slope where it will flow into the creek. A riprap apron has been designed in order to avoid erosion issues. 2 1"-0peration,&W- ntenance Agreement Project Name: Project Location: Reafield Rea Road, Union County, NC Cover Page - Maintenance records shall be kept on the following BMP(s) This maintenance record shall be kept in a log in a known set location. Any deficient BMP 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 BMP(s). The BMP(s) on this project include (check all that apply & cc Bioretention Cell Quantity, Dry Detention Basin Quantity - Grassed Swale Quantity - Green Roof Quantity Infiltration Basin Quantity Infiltration Trench Quantity Level SpreaderNFS Quantity Permeable Pavement Quantity Proprietary System Quantity. Rainwater Harvesting Quantity Sand Filter Quantity. Stormwater Wetland Quantity Wet Detention Basin Quantity Disconnected Impervious Area Present - User Defined BMP Present )rresoonai ng O&M tables will be added automatically) Location(s): Location(s) Location(s). Location(s) Location(s) Location(s) Location(s) Location(s) Location(s) Location(s) Location(s) Location(s) Location(s) LocatZ(s). Location(s). I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed for each BMP above, and attached O&M tables. I agree to notify NCDENR of any problems with the system or prior to any changes to the system or responsible party * Responsible Party Title & Organization Street address - City, state, zip Phone number(s) Email: Reafield, LLC Steve Vermillion 2400 South Blvd, Suite #300 Charlotte, NC 28203 704-561-5308 svermillion@mpvre.com Signature- Date Y/,-/ ,-7 I, iuf v Cf" , a Notary Public for the State of % )DL� (22-0-06 4_ County ofdo hearby certify that 4hPn L V�ttil/ih�—J� personally appeared before me this day of C g;5 D / % and acknowledge the due execution of the Ope ations and Maintenance Agreement Witness m hand and official seal, p�� 2/.(it 0A C. pu �. Version 1 4 G' �CTA� 4� U= Z; =n 'OUB��G ' 0%' (JRG G0 �.�• ��111111\1\\ My commission expires '/'Is/ / � 8/18/2017 0=1 Manual Pagel of 6 'Dry Detention Pond Maintenance Requirements f Important maintenance procedures - The drainage area will be managed to reduce the sediment load to the dry extended detention basin. - Immediately after the dry extended detention basin is established, the vegetation will be watered twice weekly if needed until the plants become established (commonly six weeks). - No portion of the dry extended detention pond will be fertilized after the first initial fertilization that is required to establish the vegetation. - The vegetation in and around the basin will be maintained at a height of approximately six inches. - If cracks, seepage, or woody vegetation is present, consult a dam safety expert for a dam inspection. 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 dry detention basin is established, it will be inspected quarterly. Inspection activities shall be performed as follows and any problems identified will be remediated immediately per the table below. BMP element: Potential problem: How to remediate the problem: The entire BMP Trash/debris is present. Remove the trash/debris. The perimeter of the BMP Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then plant a erosive 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 Maintain vegetation at a height of approximately six inches long The inlet device The pipe is clogged. Unclog the pipe Dispose of the sediment off-site. The pipe is cracked or Replace the pipe. otherwise damaged. Erosion is occurring in the Regrade the swale if necessary to smooth it over and provide erosion swale. control devices such as reinforced turf matting or riprap to avoid future problems with erosion. Stone verge is clogged or Remove sediment and replace with clean stone. covered in sediment (if applicable). The forebay Trash/debris is present. Remove the trash/debris Erosion has occurred or Provide additional erosion protection such as reinforced turf matting or nprap is displaced riprap if needed to prevent future erosion problems Weeds are present. Remove the weeds, preferably by hand. If pesticides are used, wipe them on the plants rather than spraying STORM -EZ 8/18/2017 Version 1 4 O&M Manual Page 3 of 6 Dry Detention Pond Maintenance Requirements (continued) J ' " ] BMP element: Potential problem: How to remediate the problem: The main treatment area Sediment has accumulated Search for the source of the sediment and remedy the problem if and reduced the depth to 75% possible. Remove the sediment and dispose of it In a location where it of the original design depth will not cause impacts to streams or the BMP. Revegetate disturbed (per pond design data sheet) areas immediately with sod (preferred) or seed protected with securely staked erosion mat. Water is standing more than Check outlet structure for clogging. If it is a design issue, consult an 5 days after a storm event. appropriate professional. Weeds and noxious plants Remove the plants by hand or by wiping them with pesticide (do not are growing in the main spray). treatment area. The embankment Shrubs or trees have started Remove shrubs or trees immediately. to grow on the embankment Grass cover is unhealthy or Restore the health of the grass cover — consult a professional If eroding. necessary. Signs of seepage on the Consult a professional. downstream face. Evidence of muskrat or Use traps to remove muskrats and consult a professional to remove beaver activity is present. beavers. An annual inspection by an Make all needed repairs. appropriate professional shows that the embankment needs repair. 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. The receiving water Erosion or other signs of Contact the local NC Department of Environment and Natural damage have occurred at the Resources Regional Office. outlet STORM -EZ 8/18/2017 Version 1 4 O&M Manual Page 4 of 6 Dry Detention' Pond'Design Summary DrV Pond Diagram DRY POND ID FOREBAY MAIN POND 1 Temporary Pool EI587 Temporary Pool EI IM Clean Out Depth 586 Clean Out Depth Pretreatment Yes Sediment Storage EI 1 Sediment Storage EI Has Veg Filter Yes Bottom Elevation 585 Bottom Elevation STORM -EZ 8/18/2017 Version 1.4 O&M Manual Page 5 of 6 Sand, Filter, Maintenance Requirements" Important maintenance procedures - The drainage area will be carefully managed to reduce the sediment load to the sand filter. - The sedimentation chamber or forebay will be cleaned out whenever sediment depth exceeds six inches - Once a year, sand media will be skimmed. - The sand filter media will be replaced whenever it fails to function properly after maintenance. The sand filter 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 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. BMP element: Potential problem: How to remediate the problem: Entire BMP 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. Perimeter of sand filter Areas of bare soil and/or Regrade the sod if necessary to remove the gully, and then plant a erosive 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 Maintain vegetation at an appropriate height. long Flow diversion structure 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. The inlet device The pipe is clogged. Unclog the pipe. Dispose of the sediment off-site. The pipe is cracked or Replace the pipe. otherwise damaged. Erosion is occurring in the Regrade the swale if necessary to smooth it over and provide erosion swale. control devices such as reinforced turf matting or nprap to avoid future problems with erosion. Stone verge is clogged or Remove sediment and replace with clean stone. covered in sediment (if applicable) Forebay or pretreatment Sediment has accumulated to Search for the source of the sediment and remedy the problem if area a depth of greater than six possible Remove the sediment and stabilize or dispose of it in a inches location where it will not cause impacts to streams or the BMP 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 a pesticide is used, wipe it on the plants rather than spraying Filter bed and underdrain Water is ponding on the Check to see if the collector system is clogged and flush if necessary. collection system surface for more than 24 If water still ponds, remove the top few inches of filter bed media and hours after a storm. replace If water still ponds, then consult an expert. 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 The receiving water Erosion or other signs of Contact the local NC Department of Environment and Natural damage have occurred at the Resources Regional Office. outlet STORM -EZ 8/18/2017 Version 1 4 O&M Manual Page 6 of 6 SUPPLEMENT -EZ FORM COVER PAGE Please indicate the types, quantities and locations of SCMs that will be used on this project Quantity Location(s) Infiltration System —� Urban Design Partners, LLC Bioretention Cell 1318-E6 Central Avenue Wet Pond _ Stormwater Wetland 704-334-3303 Permeable Pavement Sand Filter 1 Middle of property, behind parking lot Rainwater Harvesting _ Green Roof Level Spreader -Filter Strip Disconnected Impervious Surface Treatment Swale Dry Pond 1 Middle of property, behind parking lot Designer information for this project: Name and Title: Brian Smith, PE Organization Urban Design Partners, LLC Street address 1318-E6 Central Avenue City, State, Zip Charlotte, NC 28205 Phone number(s) 704-334-3303 Email: Ibnan@urb6ndesignpartners com Designer CAl��'� =OP&tss pN.�ili� SEAL 027890 �'•.FNGI�fE�e'.,C� a�.9.l't Date Applicant: Project Name: Reafield Address Rea Road City / Town Union County, NC Cm uomm� Qnabn r Company. Reafield, LLC_ - Contact George Macon_ Mailing Address _ 2400 South Blvd, Suite #300 City, State, Zip. Charlotte, NC 28_203 Phone number(s): '704-561-5308 Email :gmacon@mpvre.com Certification Statement I certify, under penalty of law: that this Supplement -EZ form and all supporting information were prepared under my direction or supervision, - that the information provided in the form is, to the best of my knowledge and belief, true, accurate, and complete, and - that the engineering plans, specifications, operation and maintenance agreements and other supporting information are consistent with the information provided here I am aware that there are significant penalties for submitting false information including the possibility of fines and imprisonment for knowing violations as well as a report being made to my professional board. Cover Page 1 4.09 PM 8/21/2017 SAND FILTER Reafield THE DRAINAGE AREA 1 Drainage area number 1 Break down of BUA in the drainage area (both new and existing): Total coastal wetlands area (sq ft) sf Parking / driveway (sq ft) 61753 sf Total surface water area (sq ft) sf Sidewalk (sq ft) 13044 sf Total drainage area (sq ft) 4 sf Roof (sq ft) 22750 sf BUA associated with existing development (sq ft) 134130 sf Roadway (sq ft) Proposed new BUA (sq ft) 134130 sf Other, please specify in the comment box below (sq ft) 36584 sf Percent BUA of drainage area 72% ITotal BUA (sq ft) 134131 sf COMPLIANCE WITH THE APPLICABLE STORMWATER PROGRAM Stormwater program(s) that apply (please specify) Design rainfall depth (in) 2 6 in n/a Minimum volume required (cu ft) Design volume of SCM (cu ft) 10841 cf 50773 cf GENERAL MDC FROM 02H .1050 #1 Is the SCM sized to treat the SW from all surfaces at build -out? Yes #7 If applicable, with the SCM be cleaned out after construction? Yes #2 Is the SCM located on or near contaminated soils? No #8 Does the mainetenance access comply with General MDC (8)? Yes #3 What are the side slopes of the SCM (H•V)? 3.1 #9 Does the drainage easement comply with General MDC (9)? Yes #3 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No- #10 If the SCM is on a single family lot, does the plat comply with General MDC (10)? #4 Are the inlets, outlets, and receiving stream protected from erosion (10 -year storm)? Yes #11 Is there an O&M Agreement that complies with General MDC (11)? Yes #5 Is there a a bypass for flows in excess of the design flow? Yes #12 Is there an O&M Plan that complies with General MDC (12)? No #6 What is the method for dewatenng the SCM for maintenance'? Drawdown Orifice 1#13 Was the SCM designed by an NC licensed professional? Yes SAND FILTER MDC FROM 02H.1056 #1 SHWT elevation (fmsl) n/a #3 Volume of stormwater from drainage area during design storm (cubic feet) 32646 cf #1 Type of sand filter (open or closed) Open #3 Total volume that can be stored above the sediment and sand chambers (cubic feet) 50773 cf #1 If closed, describe if the filter will be pre -cast or pour -in-place #3 Is this sand filter designed to attenuate peak flows? Yes " #3 Elevation of the bypass device (fmsl) 588 ft #1 If closed, top of grate elevation (fmsl) n/a #3 Descnbe the bypass device 42 Volume that can be retained in the sediment chamber (cubic feet) #2 Will there be a permanent pool in the sediment chamber? 9266 cf No 20' emergency spillway lined with rip -rap #2 Bottom of the sediment chamber (fmsl) 585 ft #4 Ponding depth from the top of the sand to the bypass device (ft) 3 ft #2 Area of the sediment chamber (square feet) 5899 sf #5 Describe the mechanism for distributing flow over the sand surface. #2 Physical depth of the sediment chamber (inches) 24 in Slope bottom of pond towards sand bed #2 Ponding depth in the sediment chamber, above any permanent pool (inches) 24 in #6 Sand specification for sand chamber #2 Elevation of top of weir between chambers (fmsl) #2 Volume that can be retained in the sand chamber (cubic feet) 587 ft 11014 cf clean washed concrete sand #2 Bottom of the sand chamber (fmsl) 585 ft #7 Depth above underdrain pipe (inches) 21 in #2 Area of the sand chamber (square feet) 6766 sf #8 Will the media be maintained to drain at least two inches per hour at the sand surface? Yes #2 Physical depth of the sand chamber (inches) 24 in #9 Is at least one clean-out pipe provided at the low point of each underdrain line? Yes #2 Ponding depth in the sand chamber, above any permanent pool (inches) 24 in, 1#9 Will clean-out pipes be capped? Yes ADDITIONAL INFORMATION Please use this space to provide any additional information about this sand filter that you think is relevant to the review SHWT has not yet been determined, will provide answer when available, 'Other' impervious area is allocated for future development of another building and parking lot Sand Filter 2 4.09 PM 8/21/2017 DRY POND Reafield THE DRAINAGE AREA 1 Drainage area number 1 Break down of BUA in the drainage area (both new and existing): Total coastal wetlands area (sq ft) sf Parking / driveway (sq ft) 61753 sf Total surface water area (sq ft) sf Sidewalk (sq ft) 13044 sf Total drainage area (sq ft) 4 sf Roof (sq ft) 22750 sf BUA associated with existing development (sq ft) 134130 sf - Roadway (sq ft) - Proposed new BUA (sq ft) 134130 sf Other, please specify in the comment box below (sq ft) 36584 sf Percent BUA of drainage area -�2 IT.t.1 BUA (sq ft) 134131 sf - COMPLIANCE WITH THE APPLICABLE STORMWATER PROGRAM Stormwater program(s) that apply (please specify) Design rainfall depth (in) 2 6 in n/a Iminimurn volume required (cu ft) 10841 cf Design volume of SCM (cu ft) 50773 cf GENERAL MDC FROM 02H.1050 #1 Is the SCM sized to treat the SW from all surfaces at build -out? Yes #7 If applicable, with the SCM be cleaned out after construction? Yes #2 Is the SCM located on or near contaminated soils? No #8 Does the mainetenance access comply with General MDC (8)? Yes #3 What are the side slopes of the SCM (H V)? 31 #9 Does the drainage easement comply with General MDC (9)? Yes #3 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No #10 If the SCM is on a single family lot, does the plat comply with General MDC (10)? #4 Are the inlets, outlets, and receiving stream protected from erosion (10 -year storm)? Yes #11 Is there an O&M Agreement that complies with General MDC (11)? Yes #5 Is there a a bypass for flows in excess of the design flow? Yes #12 Is there an O&M Plan that complies with General MDC (12)? Yes #6 What is the method for dewatering the SCM for maintenance? Drawdown Orifice #13 Was the SCM designed by an NC licensed professional? Yes DRY POND MDC FROM 02H .1062 41 SHWT elevation (fmsl) n/a #5 Describe the pretreatment that will be provided for the dry pond. #1 Elevation of the bottom of the dry pond (fmsl) 585 ft . Forebay separated by stone berm #1 Distance from bottom to SHWT (feet) n/a #6 Size of drawdown orifice (in) n/a #2 Elevation of the temporary pool during the design storm (feet) 588 ft 46 Drawdown time for the temporary pool (hours) n/a #2 Ponding depth of the design storm (feet) 3 ft #7 Does the pond minimize impacts to the receiving channel from the 1 -yr, 24 -hr storm? Yes #3 Will the dry pond be uniformly graded to flow toward the outlet? Yes 48 Is there a small permantent pool near the orifice to prevent clogging? Yes #3 Is a low flow channel being provided? No #8 Describe how the outlet will be designed to prevent clogging #4 Are the inlet(s) and outlet located in a manner that avoids short-circuiting? #4 Describe any measures, such as berms or baffles, that will be taken to increase the flow path Yes Grated top to avoid debris from entering outlet structure n/a _ #9 Are the dam and embankment planted in non -clumping turf grass'? #9 Species of turf that will be used on the dam and embankment #9 Will trees and shrubs be prevented from growing on the dam and embankment? Yes n/a Yes ADDITIONAL INFORMATION Please use this space to provide any additional information about this dry pond that you think is relevant to the review Other impervious area allocated for future development of another budding & parking lot Dry Pond 3 4 09 PM 8/21/2017