HomeMy WebLinkAboutSW3240801_Supplement-EZ Form_20241118 SUPPLEMENT-EZ COVER PAGE
LOAD SUPPLEMENT FORMS
PROJECT INFORMATION
1 Project Name Adelina Phase 1
2 Project Area(ac) 81.84
3 Coastal Wetland Area(ac) N/A
4 Surface Water Area(ac) 17.05
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&100
8 Will the vegetated setback remain vegetated? Yes
9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d)? N/A
10 Is streambank stabilization proposed on this project? Yes
NUMBER AND TYPE OF SCMs:
11 Infiltration System
12 Bioretention Cell
13 Wet Pond 4
14 Stormwater Wetland
15 Permeable Pavement
16 Sand Filter 1
17 Rainwater Harvesting(RWH)
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
LOAD SUPPLEMENT FORMS
DESIGNER CERTIFICATION
27 Name and Title: Matthew R.Reiking,Division Manager
28 Organization: ESP Associates,Inc.
29 Street address: 3475 Lakemont Blvd.
30 City,State,Zip: Fort Mill,SC,29708
31 Phone number(s): (803)802-2440
32 Email: Mreiking@ESPAssociates.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.
Designer
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Signature of Designer
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Seal Date
2024.10.31 20:48:40-04'00'
DRAINAGE AREAS
1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs _ 5
3 Does this project have low density areas? _ No
4 If so,number of low density drainage areas _
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1 2 3 4 5
4 Type of SCM Wet Pond Wet Pond Sand Filter Wet Pond Wet Pond
5 Total drainage area(sq ft) 3,284,860 1,095,098 823,284 213,444 468,706 684,328
6 Onsite drainage area(sq ft) 3,284,860 1,095,098 823,284 213,444 468,706 684,328
7 Offsite drainage area(sq ft) 0 0 0 0 0 0
8 Total BUA in project(sq ft) 1,352,545 392,868 347,762 96,512 238,361 277,042
New BUA on subdivided lots(subject to 387,145 80,330 166,025 2,748 111,034 27,008
9 permitting)(sq ft)
New BUA not on subdivided lots(subject to 591,931 150,099 182,764 70,451 128,556 60,061
10 permitting)(sf)
11 Offsite BUA(sq ft) - - - - - -
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 127,833 18,113 46,764 0 50,504 12,452
-Sidewalk(sq ft) 111,787 36,122 29,808 20,162 15,075 10,620
-Roof(sq ft) 0 0 0 0 0 0
-Roadway(sq ft) 352,324 95,864 106,205 50,289 62,977 36,989
-Future(sq ft) 0 0 0 0 0 0
-Other,please specify in the comment box _ _ _ _ _ _
below(sq ft) _
New infiltrating permeable pavement on
13 subdivided lots(sq ft) 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
Existing BUA that will remain(not subject to
15 permitting)(sq ft) 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
17 Existing BUA that will be removed(sq ft) N/A N/A N/A N/A N/A N/A
18 Percent BUA 36% 42% 45% 51% 40%
19 Design storm(inches) 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in
20 Design volume of SCM(cu ft) 34,097 29,501 14,249 19,823 23,631
21 Calculation method for design volume HRT HRT DEQ HRT HRT
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
WET POND
2 Minimum required treatment volume(cu ft 165936 cf I 127178 cf I 98895 cf I 103794 cf I
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? _ Yes Yes _ Yes Yes
4 Is the SCM located away from contaminated soils? _ Yes Yes Yes Yes
5 What are the side slopes of the SCM(H:V)? _ 3:1 3:1 3:1 3:1
6 Does the SCM have retaining walls,gabion walls or other No Yes No No
engineered side slopes? _
7 Are the inlets,outlets,and receiving stream protected from erosion 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
design volume?
9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice Drawdown Orifice Drawdown Orifice Drawdown Orifice
10 If applicable,will the SCM be cleaned out after construction? _ Yes Yes Yes _ Yes _
11 Does the maintenance access comply with General MDC(8)? Yes Yes _ Yes Yes
12 Does the drainage easement comply with General MDC(9)? Yes Yes _ Yes Yes
13 If the SCM is on a single family lot,does(will?)the plat comply with Yes Yes Yes Yes
General MDC(10)?
14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes Yes Yes
15 Is there an O&M Plan that complies with General MDC(12)? Yes Yes Yes Yes
16 Does the SCM follow the device specific MDC? Yes Yes _ Yes Yes
17 Was the SCM designed by an NC licensed professional? Yes Yes Yes Yes
WET POND MDC FROM 02H.1053 _
18 Sizing method used HRT HRT HRT HRT
19 Has a stage/storage table been provided in the calculations? Yes Yes Yes Yes
20 Elevation of the excavated main pool depth(bottom of sediment 538.00 502.00 516.00 537.00
removal)(fmsl)
21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 539.00 503.00 517.00 538.00
22 Elevation of the bottom of the vegetated shelf(fmsl) 546.00 510.00 523.00 547.00
23 Elevation of the permanent pool(fmsl) 546.50 510.50 523.50 547.50
24 Elevation of the top of the vegetated shelf(fmsl) 547.00 511.00 524.00 548.00
25 Elevation of the temporary pool(fmsl) 547.71 511.58 524.60 548.50
26 Surface area of the main permanent pool(square feet) 22943 22559 16697 23111
27 Volume of the main permanent pool(cubic feet) 85245 cf 73263 cf 53819 cf 100083 cf
28 Average depth of the main pool(feet) 6.02 ft 5.41 ft 5.15 ft 7.08 ft
29 Average depth equation used Equation 3 Equation 3 Equation 3 Equation 3
30 If using equation 3,main pool perimeter(feet) 906.0 ft 1029.0 ft 705.0 ft 945.0 ft
31 If using equation 3,width of submerged veg.shelf(feet) 5.0 ft 5.0 ft 5.0 ft 5.0 ft
32 Volume of the forebay(cubic feet) 16926 cf 13884 cf 9298 cf 18933 cf
33 Is this 15-20%of the volume in the main pool? Yes Yes Yes Yes
34 Clean-out depth for forebay(inches) 12 in 12 in 12 in 12 in
35 Design volume of SCM(cu ft) 179068 cf 147735 cf 106017 cf 104412 cf
36 Is the outlet an orifice or a weir? Orifice Orifice Orifice Orifice
37 If orifice,orifice diameter(inches) 2 in 2 in 1.5 in 2 in
38 If weir,weir height(inches)
39 If weir,weir length(inches)
40 Drawdown time for the temporary pool(days) 2.35 2.21 2.84 2.26
41 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes Yes Yes
circuiting?
42 Are berms or baffles provided to improve the flow path? Yes Yes Yes Yes
43 Depth of forebay at entrance(inches) 108 in 108 in 96 in 132 in
44 Depth of forebay at exit(inches) 102 in 102 in 90 in 126 in
45 Does water flow out of the forebay in a non-erosive manner? Yes Yes Yes Yes
46 Width of the vegetated shelf(feet) 10 ft 10 ft 10 ft 10 ft
47 Slope of vegetated shelf(H:V) 10:1 10:1 10:1 10:1
48 Does the orifice drawdown from below the top surface of the Yes Yes Yes Yes
permanent pool?
49 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes Yes Yes
yr,24-hr storm?
50 Are fountains proposed?(If Y,please provide documentation that 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
52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes Yes Yes
53 Species of turf that will be used on the dam and embankment Tall Fescue Tall Fescue Tall Fescue Tall Fescue
54 Has a planting plan been provided for the vegetated shelf? Yes Yes Yes Yes
ADDITIONAL INFORMATION
Please use this space to provide any additional information about
55 the wet pond(s):
Wet Pond 3 10:03 AM 10/29/2024
SAND FILTER
1 Drainage area number 3
2 Minimum required treatment volume(cu ft) 46832 sf
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 No
engineered side slopes?
7 Are the inlets,outlets,and receiving stream protected from erosion Yes
(10-year storm)?
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? Drawdown Orifice
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 Yes
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
SAND FILTER MDC FROM 02H.1056
18 SHWT elevation(fmsl) N/A
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) 3,418.00
24 Will there be a permanent pool in the sediment chamber? No
25 Bottom of the sediment chamber(fmsl) 555.00
26 Area of the sediment chamber(square feet) 1,956.00
27 Physical depth of the sediment chamber(inches) 24.00
28 Ponding depth in the sediment chamber,above any permanent 36.00
pool(inches)
29 Elevation of top of weir between chambers(fmsl) 557.00
Sand Chamber
30 Volume that can be retained in the sand chamber(cubic feet) 3420 cf
31 Bottom of the sand chamber(fmsl) 552.50
32 Area of the sand chamber(square feet) 2,280.00
33 Physical depth of the sand chamber(inches) 1.50
34 Ponding depth in the sand chamber,above the sand surface 24.00
(inches)
35 Elevation of the bypass device(fmsl) 558.00
36 Type of bypass device Riser
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) 24 in
40 Will the media be maintained to drain at least two inches per hour at Yes
the sand surface?
41 Is at least one clean-out pipe provided at the low point of each Yes
underdrain line?
42,Will clean-out pipes be capped? Yes
ADDITIONAL INFORMATION
Please use this space to provide any additional information about
43 the sand filter(s):
Sand Filter 4 10:03 AM 10/29/2024