HomeMy WebLinkAboutSW3220801_Supplement-EZ Form_20230801 SUPPLEMENT-EZ COVER PAGE
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PROJECT INFORMATION
1 Project Name Stonebow Retail Center
2 Project Area(ac) 3.418 —
3 Coastal Wetland Area Lac) 0
4 Surface Water Area(ac) 0
5 Is this project High or Low Density? High
6 Does this project use an off-site SCM7 No
COMPLIANCE WITH 02H.1003(4)
7 Width of vegetated setbacks provided(feet) 30
8 Will the vegetated setback remain vegetated? - - N/A
9 If BUA is proposed in the setback,does it meet NCAC 02H-10030)(c-d)? N/A
10 Is streambank stab lization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System _ 0
12 Bioretention Cell 0
13 Wet Pond 1
14 Stormwater Wetland 0
15 Permeable Pavement 0
16 Sand F Iler 0
17 jRainwater Harvesting(RWH) 0
18 'Green Roof 0
19 'Level Spreader-Filter Strip(LS-FS) 0
20 Disconnected Impervious Surface LDIS) 0
21 Treatment Swale 0
22 Dry Pond _ _ 0
23 fStormFilter 0
24 Silva Cell 0
25 4Baytiilter 0�
26 Filterra 0
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DESIGNER CERTIFICATION
27 'Name and Title: Frank McMahan,PE
28 ,Organization: Landdesign
29 Street address: 223. North Graham Street
30 City.State.Zip: - Charlotte,NC,28202
31 Phone number(si (704)333-0325
32 Email: fmcmahan®landdesign com
Certification Statement:
I certify under pens ty of law that this Supplement-EZ form and ell 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 end maintenance agreements and other supporting Information are consistent with the Information provided here
Designer
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SEAL — Signature "igner
037773
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e9/AZ3
Sea! Date
DRAINAGE AREAS
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1 Is this a high density project? Yes
2 If so, number of drainage areas/SCMs 1
3 Does this project have low density areas? No
4 If so, number of low density drainage areas 0
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site I
4 Type of SCM WETPOND
5 Total drainage area (sq ft) 156513 _ 156513
6 Onsite drainage area (sq ft) 134931 134931
7 Offsite drainage area (sq ft) 21582 21582
8 Total BUA in project (sq ft) 84506 sf 84506 sf
New BUA on subdivided lots (subject to
9 permitting) (sq ft) N/A N/A
New BUA not on subdivided lots (subject to
10 _permitting) (sf) 64279 sf 64279 sf
11 Offsite BUA (sq ft) _ 20227 sf 20227 sf
12 Breakdown of new BUA not on subdivided lots:
- Parking (sq ft) 32147 sf 32147 sf
- Sidewalk (sq ft) 9052 sf 9052 sf
- Roof(sq ft) 16953 sf 16953 sf
- Roadway(sq ft) 6127 sf 6127 sf
- Future (sq ft) N/A N/A
- Other, please specify in the comment box
below{sq ft) N/A N/A
New infiltrating permeable pavement on
13 subdivided lots (sq ft) N/A N/A
New infiltrating permeable pavement not on
14 subdivided lots (sq ft) N/A N/A
Existing BUA that will remain (not subject to
15 permitting)(sq ft) sf sf
16 Existing BUA that is already permitted (sq ft) N/A N/A
17 Existing BUA that will be removed (sq ft) sf sf
18 Percent BUA 54% 54%
19 Design storm (inches) 1.0 in
20 Design volume of SCM (cu ft) 7691 cf
21 iCalculation method for design volume HYDROCAD
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
WET POND
1 Drainage area number 1
2,Minimum required treatment volume(cu ft) } 6990 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 Yes
side slopes?
Are the inlets, outlets, and receiving stream protected from erosion
7 (10-year storm)? Yes
8 Is there an overflow or bypass for inflow volume in excess of the Yes
design volume?
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
If the SCM is on a single family lot, does (will?)the plat comply with
13 General MDC (10)? N/A
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
WET POND MDC FROM 02H.1053
18 Sizing method used SA/DA
19 Has a stage/storage table been provided in the calculations? Yes
20 Elevation of the excavated main pool depth (bottom of sediment 623.50
rremoval) (fmsQQ
21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 624.00
22 Elevation of the bottom of the vegetated shelf(fmsl) 628.50
23 Elevation of the permanent pool (fmsl) 629.00
24 Elevation of the top of the vegetated shelf(fmsl) 629.50
25 Elevation of the temporary pool (fmsl) 630.00
26 Surface area of the main permanent pool (square feet) 5326
27 Volume of the main_permanent pool (cubic feet) 17602 cf
28 Average depth of the main pool (feet) 3.30 ft
29 Average depth equation used Equation 2
30 If using equation 3, main pool perimeter(feet) N/A
31 If using equation 3, width of submerged veg. shelf(feet) N/A
32 Volume of the forebay(cubic feet) 3059 cf
33 Is this 15-20% of the volume in the main pool? Yes
34 Clean-out depth for forebay(inches) 6 in
35 Design volume of SCM (cu ft) 7691 cf
36 Is the outlet an orifice or a weir? Orifice
37 If orifice, orifice diameter(inches) 1.50 in
38 If weir, weir height(inches) N/A
39 If weir, weir length (inches) N/A
40 Drawdown time for the temporary pool (days) 2.66
WET POND
41 Are the inlet(s) and outlet located in a manner that avoids short- Yes
circuiting?
42 Are berms or baffles provided to improve the flow path? No
43 Depth of forebay at entrance (inches) 48 in
44 Depth of forebay at exit (inches) 42 in
45 Does water flow out of the forebay in a non-erosive manner? Yes
46 Width of the vegetated shelf(feet) 6 ft
47 Slope of vegetated shelf(H:V) 6:1
48 Does the orifice drawdown from below the top surface of the Yes
permanent pool?
49 Does the pond minimize impacts to the receiving channel from the 1- Yes
yr, 24-hr storm?
50 Are fountains proposed? (If Y, please provide documentation that No
MDC(9) is met.)
51 Is a trash rack or other device provided to protect the outlet system? Yes
52 Are the dam and embankment planted in non-clumping turf grass? Yes
53 Species of turf that will be used on the dam and embankment HYBRID
BERMUDA
54 Has a planting plan been provided for the vegetated shelf? Yes
ADDITIONAL INFORMATION
55 Please use this space to provide any additional information about the
wet pond(s):