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Home My WebLink About20220684 Ver 2_21-027 - The Charles - NCDEQ Stormwater Wetland Supplement Form_20230517 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name The Charles 2 Project Area ac 4.261 3 Coastal Wetland Area ac 0 4 Surface Water Area ac p 5 Is this project High or Low Densi High 6 Does this project use an off-site SCM? No COMPLIANCE WITH 02H:1003(4) 7 Width of vegetated setbacks provided feet N/A 8 Will the vegetated setback remain vegetated? NIA 9 If BUA is proposed in the setback,does it meet NCAC 02H.1003 4 c-d? NIA 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 12 Bioretention Cell 13 Wet Pond 14 Stormwater Welland 1 15 Permeable Pavement 16 Sand Filter 17 Rainwater Harvesting RW H 18 Green Roof 19 Level Spreader-Filter Strip LS-FS 20 Disconnected Impervious Surface DIS 21 Treatment Swale 22 Dry Pond 23 StormFilter 24 Silva Cell 25 Bayfilter 26 Filterra FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Igor Palyyoda,PENice President 28 O anizatlon; Baldwin Design Consultants,PA 29 Street address: 1700-D East Arlington Boulevard 30 City,State,Zip: Greenville,NC 27858 31 Phone numbers: _ _ _L254756-1390 32 Email: ipalyvoda@baldwindesig iconsultants.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, spe_ifications,operation and maintenance agreements and other supporting information are consistent with the information provided here Des ner ``��iniiinrn��r ,oe'aF Ss 0*.. SEAL = Sigma r of Designer 043249 = ' iV177 G►NE�PL- �` Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 2 3 Does this project have low density areas? Yes 4 If so, number of low density drainage areas 1 Is all/part of this project subject to previous rule 5 versions? No CLICK TO LOAD FORM DRAINAGE AREA INFORMATION Entire Site 2 Stormwater t Wetland+ Stormwater 4 Type of SCM Bypassed Wetland Onl Bypassed Only 5 Total drainage area (sq ft 1175945 sf 977964 sf 197981 sf 6 Onsite drainage area(sq ft 1036598 sf 838617 sf 197981 sf 7 Offsite drainage area (sq ft 139347 sf 139347 sf 8 Total BUA in project(sq ft 535352 sf 501680 sf 33672 sf New BUA on subdivided lots (subject to 9permitting) s ft _ New BUA not on subdivided lots (subject to 10permitting) sf 528862 sf 495190 sf 33672 sf 11 Offsite BUA (sq ft 6490 sf 6490 sf 12 Breakdown of new BUA not on subdivided lots: 528862 sf 495190 sf 33672 sf - Parking (sq ft 311149 sf 303700 sf 7449 sf -Sidewalk (sq ft - Roof (sq ft 201552 sf 191490 sf 10062 sf - Roadway s ft 16161 sf 16161 sf - Future(sq ft -Other, please specify in the comment box below(sq ft New infiltrating permeable pavement on 13 subdivided lots (sq ft New infiltrating permeable pavement not on 14 subdivided lots (sq ft Existing BUA that will remain (not subject to 15permitting) s ft 16 Existing BUA that is already permitted (sq ft 17 Existing BUA that will be removed (sq ft 18 Percent BUA 46% 51% 17% 19 Design storm inches 1.0 in 1.0 in 1.0 in 20 1 Design volume of SCM cu ft _ 45055 cf 41701 cf 3350 cf 21 lCalculation method for design volume Simple Simple Simple ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 1drainage area(s): Item 18: For the purpose of determining min. required WOV, SW is oversized by considering existing offsite BUA and proposed onsite bypassed BUA in the SA/DA calculations as if this BUA was treated by SW (worst case scenario resulting in largest WQV). STORMWATER WETLAND _ 1 Drainage area number 1 21 Minimum required treatment volume cu ft 45055 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 Does the SCM have retaining walls, gabion walls or other 6 engineered side slopes? No Are the inlets, outlets, and receiving stream protected from erosion 7 10- ear storm)? Yes Is there an overflow or bypass for inflow volume in excess of the 8 design volume? Yes 9 What is the method for dewatering the SCM for maintenance? Pump (preferred) 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 N/A 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 licensedprofessional? Yes STORMWATER WETLAND MDC FROM 02H.1054 18 Design volume of SCM (cu ft) 45557 19 Are the inlet(s) and outlet located in a manner that avoids short- circuiting? Yes 20 Are berms or baffles provided to improve the flow path? No 21 Does the orifice drawdown from below the top surface of the permanent pool? Yes Does the wetland minimize impacts to the receiving channel from the 22 1-yr, 24-hr storm? Yes 23 Is a trash rack or other device provided to protect the outlet system? I Yes Elevations 24 Elevation, peak attenuation above temporary pool (if applicable) 58.22 fmsl 25 Elevation, temporary pool (top of the temporary inundation zone) 58.00 fmsl 26 Elevation, permanent pool (top of the shallow water zone) (fmsl) 56.75 27 Elevation, bottom of shallow water zone (fmsl) 56.00 28 Elevation, bottom of forebay deep pool at deepest point (at forebay 54.00 entrance) (fmsl Elevation, bottom of forebay deep pool at shallowest point (at 29 forebayexit (fmsl) 54.00 30 Elevation, bottom of non-forebay deep pool at deepest point (fmsl) 54.00 STORMWATER WETLAND Planting Zones 31 Area, total surface area of the SW wetland at temporary pool elev. 40,500 (sq ft 32 Area, temporary inundation zone at temporary pool elev. (sq ft) 12,150 33 Area, shallow water zone at temporary pool elev. (sq ft) 18,225 34 Area, forebay at temporary pool elev. (sq ft) 4,050 35 Area, non-forebay deep pool at temporary pool elev .(sq ft) 6,075 36 Percent area provided, temporary inundation zone (should be 30- 30% 45% 37 Percent area provided, shallow water zone (should be 35-45%) 45% 38 Percent area provided, deep pool (forebay) (should be 10-15%) 10% 39 Percent area provided, deep pool (non-forebay) (should be 5-15%) 15% Depths and Outlet 40 Peak attenuation depth above temporary inundation zone (inches) 3 in 41 Temporary inundation zone depth (temporary pool to permanent 15 in pool) inches Shallow water zone depth (permanent pool to bottom of wetland) 42 (inches) 9 �n 43 Depth, forebay at entrance (permanent pool to bottom of forebay 33 in entrance) (inches 44 Depth, forebay at exit (permanent pool to bottom of forebay exit) 33 in inches Depth, non-forebay deep pools (permanent pool to deep pool 45 bottom (inches) 33 in 46 If there is an orifice, diameter (inches) 4 in 47 If there is a weir, weir height (inches) _ 54 in 481 If there is a weir, weir length (inches) 36 in 49 Drawdown time for the temporary pool (days) 2.1 STORMWATER WETLAND Soil and Plants 50 Soil amendment depth (inches) N/A 51 Has a soil amendment specification been provided? No 52 Has a landscaping plan that meets SW Wetland MDC (12) been Yes provided? 53 Number of plants per 200 square feet (#) in the shallow water zone: COO 54 Does the temporary inundation zone planting comply with SW Yes Wetland MDC 14 ? 55 Are the dam structure and temporary fill slopes planted in non- Yes 1clumpingturf grass? 56 Will cattails be planted in the wetland? No ADDITIONAL INFORMATION 57 Please use this space to provide any additional information about the stormwater wetland(s):