SW3220702_Supplement-EZ Form_20231103

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 iProject Name Preserve at Forest Creek Phase2
2 Protect Area jag)--- 105.26
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 2.5
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 4If BUA is proposed in the setback,does it meet NCAC 02H 1003(4)(c-d)? No
10 ils streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11- Infiltration SSstem 0
12 Bioretention Cell 0
13 Wet Pond _ 6
14 Stormwater Wetland 0
15 Permeable Pavement 0
16 Sand FJter 0
17 ..Rainwater Harvesting(RWH) - 0
18 Green Roof L_ 0 _.._._
19 Level Spreader-Fitter Strip(LS-FS) 0
20 Disconnected Impervious Surface(DIS) 0
21 Treatment Swale 0
22 Dry Pond _ _ 0
23 .StormFilter 0
24 Silva Cell 0
25 Bayfilter 0
26 Flterra 0
FORMS LOADED
_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 n umber(s): [phone]
32 Email: [e-mail]
Certification Statement'
I certify,under penalty of law that this Supplement-EZ form and a!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.
--freer
Signature of tgner
0 i173
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"b�1. IYrQ �r ` // 2 OZ�]
5eaf'i i`r r r Date

DRAINAGE AREAS
1 Is this a high density project? Yes
2 If so, number of drainage areas/SCMs 6
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 1
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1 2 3 4 5 6
4 Type of SCM WETPOND 7 _ WETPOND 8 WETPOND 9 WETPOND 10 WETPOND 11 WETPOND 12
5 Total drainage area (sq ft) 3698571 620017 713193 811710 524332 326,050 361401
6 Onsite drainage area (sq ft) 3284604 620017 713193 680552 263305 sf 304484 361,401
7 Offsite drainage area (sq ft) 413967 0 0 131158 sf 261027 sf 21782 0
8 Total BUA in project (sq ft) 1823595 sf 438641 sf 484169 sf 398486 sf 109321 sf 187894 sf 205084 sf
New BUA on subdivided lots (subject to
9 permitting) (sq ft) 1328993 sf 319711 sf 375495 sf 292657 sf _ 76660 sf 135220 sf 129250 sf _
New BUA not on subdivided lots (subject to 1
10 permitting) (sf) 494602 sf I 118930 sf 108674 sf 105829 sf 32661 sf 52674 sf 75834 sf
11 Offsite BUA (sq ft) 413967 sf N/A N/A 131158 sf 261027 sf 21782 sf N/A
12 Breakdown of new BUA not on subdivided lots:
- Parking (sq ft) 1551 sf N/A N/A 932 sf N/A N/A 619 sf
- Sidewalk (sq ft) 132321 sf 32993 sf 27939 sf 28828 sf 8296 sf 14257 sf 20008 sf
- Roof(sq ft) N/A N/A N/A N/A N/A N/A N/A
- Roadway (sq ft) 294037 sf 70323 sf 66131 sf 61434 sf 20196 sf 31054 sf 44899 sf
i
- Future (sq ft) N/A N/A N/A N/A N/A N/A N/A
- Other, please specify in the comment box
below (sq ft) 66693 sf 15614 sf 14604 sf 14635 sf 4169 sf 7363 sf 10308 sf
New infiltrating permeable pavement on
13 subdivided lots (sq ft) N/A N/A N/A N/A N/A N/A N/A
New infiltrating permeable pavement not on
14 subdivided lots (sq ft) N/A N/A N/A N/A N/A N/A N/A
Existing BUA that will remain (not subject to
15 permitting) (sq ft) N/A N/A N/A N/A N/A N/A N/A
16 Existing BUA that is already permitted (sq ft) N/A N/A N/A N/A N/A N/A N/A
17 Existing BUA that will be removed (sq ft) N/A N/A N/A N/A N/A N/A N/A
18 Percent BUA 60% 71% 68% 65% 71% 64% 57%
19 Design storm (inches) N/A 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in
20 Design volume of SCM (cu ft) N/A 63480 cf 42439 cf 56209 cf 38076 cf 18870 cf 19641 cf
21 Calculation method for design volume N/A PONDPACK PONDPACK PONDPACK PONDPACK PONDPACK PONDPACK
ADDITIONAL INFORMATION
'Please use this space to provide any additional information about the
22 ,drainage area(s):
Other BUA includes curb & gutter. Offsite drainage area has been assumed
to be 100% BUA. Refer to the deed restriction form for on-site lot BUA
percentages.

WET POND
1 Drainage area number 7 8 9 10 11 12
2 Minimum required treatment volume (cu ft) 35481 cf I 39268 cf I 43108 cf I 29955 cf 17074 cf 16861 cf
GENERAL MDC FROM 02H .1050 Mb
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes Yes Yes Yes Yes Yes
4 Is the SCM located away from contaminated soils? Yes Yes _ Yes Yes Yes Yes
5 What are the side slopes of the SCM (H:V)? 3:1 3:1 3:1 3:1 3:1 3:1
6 Does the SCM have retaining walls, gabion walls or other Yes No Yes No Yes Yes
engineered side slopes?
7,Are the inlets, outlets, and receiving stream protected from erosion Yes Yes Yes Yes Yes Yes
(10-year storm)?
8 Is there an overflow or bypass for inflow volume in excess of the Yes Yes Yes Yes Yes Yes
design volume?
9 What is the method for dewatering the SCM for maintenance? Pump (preferred) Pump (preferred) Pump (preferred) Pump (preferred) Pump (preferred)_ Pump (preferred)
10 If applicable, will the SCM be cleaned out after construction? Yes Yes Yes Yes Yes Yes
11 Does the maintenance access comply with General MDC (8)? Yes Yes Yes Yes Yes Yes
12 Does the drainage easement comply with General MDC (9)? Yes Yes Yes Yes Yes Yes
13 If the SCM is on a single family lot, does (will?)the plat comply with N/A N/A N/A N/A N/A N/A
General MDC (10)?
14 Is there an O&M Agreement that complies with General MDC (11)? Yes Yes Yes Yes Yes Yes
15 Is there an O&M Plan that complies with General MDC (12)? Yes Yes Yes Yes Yes Yes
16 Does the SCM follow the device specific MDC? Yes Yes Yes Yes Yes Yes
17 Was the SCM designed by an NC licensed rofessional? Yes Yes Yes Yes Yes Yes
WET POND MD OM 02H .1053
18 Sizing method used SA/DA SA/DA _ SA/DA SA/DA SA/DA SA/DA
19 Has a stage/storage table been provided in the calculations? Yes Yes Yes Yes Yes Yes
20'Elevation of the excavated main pool depth (bottom of sediment 639.50 616.50 649.50 649.50 627.50 608.50
removal) (fmsl)
21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 640.00 617.00 650.00 650.00 628.00 609.00
22 Elevation of the bottom of the vegetated shelf(fmsl) 643.50 621.50 653.50 654.50 632.50 613.50
23 Elevation of the permanent pool (fmsl) 644.00 622.00 654.00 655.00 633.00 614.00
24 Elevation of the top of the vegetated shelf(fmsl) _ 644.50 622.50 654.50 655.50 633.50 614.50
25 Elevation of the temporary pool (fmsl) 646.30 624.00 656.25 656.80 634.75 615.75
26 Surface area of the main permanent pool (square feet) 20972 15467 _ 19530 15439 8265 7955
27 Volume of the main permanent pool (cubic feet) 71528 cf 62265 cf 69571 cf 61875 cf 31369 cf 29266 cf
28 Average depth of the main pool (feet) 3.41 ft 4.03 ft 3.56 ft 3.81 ft 3.80 ft 3.68 ft
29 Average depth equation used Equation 2 Equation 2 Equation 2 Equation 2 Equation 2 Equation 2
30 If using equation 3, main pool perimeter(feet) N/A N/A N/A N/A N/A N/A
31 If using equation 3, width of submerged veg. shelf(feet) N/A N/A N/A N/A N/A N/A
32 Volume of the forebay(cubic feet) 13856 cf 11358 cf 10546 cf 10040 cf 4934 cf 4834 cf
33 Is this 15-20% of the volume in the main pool? Yes Yes Yes Yes Yes Yes
34 Clean-out depth for forebay(inches) 6 in 6 in 6 in 6 in 6 in 6 in
35 Design volume of SCM (cu ft) 63480 cf 42439 cf 56209 cf 38076 cf 18870 cf 19641 cf
36 Is the outlet an orifice or a weir? Orifice Orifice Orifice Orifice Orifice Orifice
37 If orifice, orifice diameter(inches) 3.00 in _ 2.50 in 3.00 in 3.00 in 2.00 in 2.25 in
38 If weir, weir height (inches) N/A N/A N/A N/A _ N/A N/A
39 If weir, weir length (inches) N/A N/A N/A N/A N/A N/A
40 Drawdown time for the temporary pool (days) 3.89 2.82 3.3 2.65 2.81 2.45
41 Are the inlet(s) and outlet located in a manner that avoids short- Yes Yes Yes Yes Yes Yes
circuiting?
42 Are berms or baffles provided to improve the flow path? No No No No No No
43 Depth of forebay at entrance (inches) 58 in 70 in 58 in 70 in 70 in 70 in
44 Depth of forebay at exit(inches) 54 in 66 in 54 in 66 in 66 in 66 in
45 Does water flow out of the forebay in a non-erosive manner? Yes Yes Yes Yes Yes Yes
46 Width of the vegetated shelf(feet) 6 ft 6 ft 6 ft 6 ft 6 ft 6 ft
47 Slope of vegetated shelf(H:V) 6:1 6:1 6:1 6:1 6:1 6:1
48 Does the orifice drawdown from below the top surface of the Yes Yes Yes Yes Yes Yes
permanent pool?
49 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes Yes Yes Yes Yes
yr, 24-hr storm?
50 Are fountains proposed? (If Y, please provide documentation that No No No No No No
MDC(9) is met.)
51 Is a trash rack or other device provided to protect the outlet system? Yes Yes Yes Yes Yes Yes
52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes Yes Yes Yes Yes
HYBRID HYBRID HYBRID HYBRID HYBRID HYBRID
53 Species of turf that will be used on the dam and embankment BERMUDA BERMUDA BERMUDA _ BERMUDA BERMUDA BERMUDA
54 Hasa lantin Ian been rovided for the ve etated shelf? Yes Yes Yes Yes Yes Yes I
ADDITIONAL INFORMATION
Please use this space to provide any additional information about
55 the wet pond(s):
2