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Home My WebLink AboutSW3190704_Form_(Supp.EZ)_20200925SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name Skyland Drive Townhomes 2 Project Area ac 4.335 acres 3 Coastal Wetland Area ac 0 4 Surface Water Area ac 0.171 5 Is this project High or Low Density? High 6 Does this project use an off -site SCM? No COMPLIANCE WITH 02H .1003(4) 7 Width of vegetated setbacks provided feet 30 8 Will the vegetated setback remain vegetated? Yes 9 Is BUA other that as listed in .1 0034 c-d out of the setback? Yes 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 0 12 Bioretenticn Cell 0 13 Wet Pond 0 14 Stormwater Wetland 0 15 Permeable Pavement 0 16 Sand Filter 1 17 Rainwater Harvesting RWH 0 18 Green Roof 0 19 1 Level Spreader -Filter Strip LS-FS 0 20 Disconnected Impervious Surface (DIS) 0 21 Treatment Swale 0 22 Dry Pond 0 23 Storm Filter 0 24 Silva Cell 0 25 Ba filter 0 26 1 Filterra 0 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Barry M. Fay P.E. 28 Organization: American Engineering Associates - Southeast P.A. 29 Street address: 8008 Corporate Center Drive, Suite 110 30 City, State, Zip: Charlotte, NC 28226 31 Phone numbers : 704 375-2438 32 Email: bfay@american-ea.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. C L 33046 Signature of Designer Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 1 3 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAIN A AREA INFORMATION 4 Type of SCM Entire Site -- 1 Sand Filter 5 Total BUA in project (sq ft 58050 sf 61571 sf 6permitting) New BUA on subdivided lots (subject to s ft 27200 sf 27200 sf 7permitting) New BUA outside of subdivided lots (subject to sf 30850 sf 30850 sf 8 Offsite - total area (sq ft — -- 9 Offsite BUA (sq ft — 3521 sf 10 Breakdown of new BUA outside subdivided lots: - Parking (sq ft 864 sf 864 sf - Sidewalk (sq ft 4573 sf 4573 sf - Roof (sq ft - - Roadway s ft 20425 sf 20425 sf - Future (sq ft 4988 sf 4988 sf - Other, please specify in the comment box below (sq ft 11 New infiltrating permeable pavement on subdivided lots (sq ft 12 New infiltrating permeable pavement outside of subdivided lots (sq ft 13permitting) Exisitng BUA that will remain (not subject to s ft 14 1 Existing BUA that is already ermitted (sq ft 15 Existing BUA that will be removed (sq ft 16 Percent BUA 31 % 61 % 17 Design storm inches 1 in 18 Design volume of SCM cu ft 3771 cf 19 Calculation method for design volume Simple ADDITIONAL INFORMATION 20 Please use this space to provide any additional information about the 1drainage area(s): Offsite BUA consists of existing pavement on Skyland Drive contributing to onsite drainage areas. Future BUA area is for additional parking. DRAINAGE AREA INFORMATION Entire Site 1 4 Type of SCM N/A 5 Total BUA from project (sq ft) 6 1995 rules SL 2006-246 2008 rules 2017 rules 7 New BUA on subdivided lots (subject to permitting) (sq ft) 1995 rules SL 2006-246 2008 rules 2017 rules New BUA outside of subdivided lots (subject 8 to permitting) (sf) 1995 rules SL 2006-246 2008 rules 2017 rules 9 Offsite - total area (sq ft) 1995 rules SL 2006-246 2008 rules 2017 rules 10 Offsite BUA (sq ft) 1995 rules SL 2006-246 2008 rules 2017 rules 11 IDesign storm (inches) 1995 rules SL 2006-246 2008 rules 2017 rules 12 Breakdown of new BUA: - Parking (sq ft - Sidewalk (sq ft - Roof (sq ft -Roadway (sq ft - Future sq ft - Other, please specify in the comment box below (sq ft 13 New infiltrating permeable pavement on subdivided lots (sq ft 14 New infiltrating permeable pavement outside of subdivided lots (sq ft 15permitting) Exisitng BUA that will remain (not subject to s ft 16 Existina BUA that is already permitted (sq ft 17 Existing BUA that will be removed (sq ft 18 Percent BUA 19 Design volume of SCM cu ft 20 Calculation method for design volume ADDITIONAL INFORMATION 21 Please use this space to provide any additional information about the drainage area(s): SAND FILTER 1 1Drainage area number 1 2 luesign volume of SCM cu ft) 3771 cf GENERAL MDC FROM 02H .1050 3 Is the SCM sized to treat the SW from all surfaces at build -out? Yes 4 Is the SCM located away from contaminated soils? Yes 5 What are the side slopes of the SCM (H:V)? 3:1 6 Does the SCM have retaining walls, gabion walls or other engineered side slopes? Yes 7 Are the inlets, outlets, and receiving stream protected from erosion (10- 1year storm)? Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes 9 What is the method for dewatering the SCM for maintenance? Other 10 If applicable, will the SCM be cleaned out after construction? Yes 11 Does the maintenance access comply with General MDC (8)? Yes 12 Does the drainage easement comply with General MDC (9)? Yes 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC (10)? 14 Is there an O&M Agreement that complies with General MDC (11)? Yes 15 Is there an O&M Plan that complies with General MDC (12)? Yes 16 Does the SCM follow the device specific MDC? Yes 17 Was the SCM designed by an NC licensed professional? Yes ISAND FILTER MDC FROM n2H AnS6 18 SHWT elevation (fmsl) See Report 19 Type of sand filter (open or closed) Open 20 If closed, will the filter will be pre -cast or pour -in -place? 21 If closed, top of grate elevation (fmsl) 22 Is this sand filter designed to attenuate peak flows? Yes Sediment Chamber 23 Volume that can be retained in the sediment chamber (cubic feet) 1982 cf 24 Will there be a permanent pooF in the sediment chamber? No 25 Bottom of the sediment chamber (fmsl) 666.00 26 Area of the sediment chamber (square feet) 844 sf 27 Physical depth of the sediment chamber (inches) 20.4 28 Ponding depth in the sediment chamber, above any permanent pool (inches) 29 1 Elevation of top of weir between chambers (fmsl) 668 Sand Chamber 30 Volume that can be retained in the sand chamber (cubic feet) 1974 cf 31 Bottom of the sand chamber (fmsl) 666.00 32 Area of the sand chamber (square feet) 845 sf 33 Physical depth of the sand chamber (inches) 20.4 34 Ponding depth in the sand chamber, above any permanent pool (inches) 35 Elevation of the bypass device (fmsl) 667.7 36 Type of bypass device Orifice/Bleeder 37 Mechanism for distributing flow over the sand surface Sheet Flow 38 Sand specification for sand chamber ASTM C33 39 Depth above underdrain pipe (inches) 30 in 40 Will the media be maintained to drain at least two inches per hour at the sand surface? Yes 41 Is at least one clean -out pipe provided at the low point of each underdrain line? Yes 42 lWill clean -out pipes be capped? Yes ADDITIONAL INFORMATION 43 Please use this space to provide any additional information about the Sand Filter(s): All of the runoff from proposed BUA is directed towards the sand filter. Dewatering will consist of a pump and a silt bag. Sand Filter 1 9:26 AM 9/10/2020