HomeMy WebLinkAboutSW3240801_Supplement-EZ Form_20240814 SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
(PROJECT INFORMATION I
1 Project Name Adelina Phase 1
2 Project Area (ac) 230.97
3 Coastal Wetland Area (ac) N/A
4 Surface Water Area (ac) N/A
5 Is this project High or Low Density? High
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H .1003(4) I
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 1
23 StormFilter
24 Silva Cell
25 Bayfilter
26 Filterra
FORMS LOADED
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
\\\`��N `��D ��`•,\N �CA%/1//, Matthew R. Reiking
o fr off.,,.. �\-57,
/ �•, _ Signature of Designer
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A - _ i. LICENSE NO.: s
- 038830 - - F-1407 _
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2024.06.12 13:28:01-04'00' 06/12/24
Seal Date
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
4 Type of SCM Wet Pond Wet Pond Sand Filter _ Wet Pond
5 Total drainage area (sq ft) 3,284,860 1,095,098 823,284 213,444 468,706
6 Onsite drainage area (sq ft) 3,284,860 1,095,098 823,284 213,444 468,706
7 Offsite drainage area (sq ft) 0 0 0 0 0
8 Total BUA in project (sq ft) 1,352,316 392,868 347,762 96,512 238,361
New BUA on subdivided lots (subject to _ _ _ _ _
9 permitting) (sq ft)
New BUA not on subdivided lots (subject to _ _ _ _ _
10 permitting) (sf)
11 Offsite BUA (sq ft) - - - - -
12 Breakdown of new BUA not on subdivided lots:
- 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)
New infiltrating permeable pavement on
13 subdivided lots (sq ft) 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
Existing BUA that will remain (not subject to
15 permitting) (sq ft) 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
18 Percent BUA
19 Design storm (inches) _ 1.0 in 1.0 in 1.0 in 1.0 in
20 Design volume of SCM (cu ft) 34,097 29,501 8,142 19,823
21 Calculation method for design volume HRT HRT DEQ HRT
—
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
D RAI NAG E 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 5
4 Type of SCM _ Wet Pond
5 Total drainage area (sq ft) 3,284,860 684,328
6 Onsite drainage area (sq ft) 3,284,860 684,328
7 Offsite drainage area (sq ft) 0 0
8 Total BUA in project (sq ft) 1,352,316 276,813
New BUA on subdivided lots (subject to
9 permitting) (sq ft)
New BUA not on subdivided lots (subject to
10 permitting) (sf)
11 Offsite BUA (sq ft) - -
12 Breakdown of new BUA not on subdivided lots:
- 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)
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) N/A N/A
16 Existing BUA that is already permitted (sq ft) N/A N/A
17 Existing BUA that will be removed (sq ft) N/A N/A
18 Percent BUA
19 Design storm (inches) 1.0 in
20 Design volume of SCM (cu ft) 23,631
21 Calculation method for design volume HRT
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
WET POND
I Drainage area number 1 2 4 5
2 Minimum required treatment volume cu ft 83059 cf I 71864 cf I 48290 cf 57566 cf
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 No No No No
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 rofessional? 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) 547.71 511.58 524.60 548.40
26 Surface area of the main permanent pool (square feet) 22943 22559 15163 23111
27 Volume of the main permanent pool (cubic feet) 99691 cf 85641 cf 56128 cf 116302 cf
28 Average depth of the main pool (feet) 7.06 ft 6.34 ft 6.14 ft 8.24 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) 14447 cf 12378 cf 8980 cf 16219 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) 34097 cf 29501 cf 19823 cf 23631 cf
36 Is the outlet an orifice or a weir? Orifice Orifice Orifice Orifice
37 If orifice, orifice diameter (inches) 2 in 2 in 2 in 2 in
38 If weir, weir height (inches)
39 If weir, weir length (inches)
40 Drawdown time for the temporary pool (days) 2.27 2.17 2.59 2
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) 54 in 54 in 66 in 66 in
44 Depth of forebay at exit (inches) 54 in 54 in 66 in 66 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 Wetland Mix Wetland Mix Wetland Mix Wetland Mix
54 Has a planting plan been provided for the vegetated shelf? Yes Yes Yes Yes
ADDITIONAL INFORMATION
755 Please use this space to provide any additional information about
the wet pond(s):
- ]
Wet Pond 4 3:14 PM 6/13/2024
SAND FILTER
1 Drainage area number 5
2 Minimum re uired treatment volume cu ft 6107 sf
GENERAL MDC FROM 02H .1050
_ 3 Is the SCM sized to treat the SW from all surfaces at build-out? Ycs
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 No
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
13 If the SCM is on a single family lot, does (will?) the plat comply with 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 rofessional? 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?
2j 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) N/A
24 Will there be a permanent pool in the sediment chamber? _ N/A
25 Bottom of the sediment chamber (fmsl) N/A
26 Area of the sediment chamber (square feet) N/A
27 Physical depth of the sediment chamber (inches) N/A
28 Ponding depth in the sediment chamber, above any permanent N/A
pool (inches)
29 Elevation of top of weir between chambers (fmsl) N/A
Sand Chamber
30 Volume that can be retained in the sand chamber (cubic feet) 6107 cf _
31 Bottom of the sand chamber (fmsl) _ 552.50
32 Area of the sand chamber (square feet) 1,552.00
_ 33 Physical depth of the sand chamber (inches) 1.50
34 Ponding depth in the sand chamber, above the sand surface 0.87
(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 ca ed? Yes
ADDITIONAL INFORMATION
43 Please use this space to provide any additional information about
the sand filter(s):
Sand Filter 5 3:14 PM 6/13/2024
DRY POND
1 Drainage area number 4.90
2 Minimum required treatment volume (cu ft) 8142.09
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 1 No
design volume?
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 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 desi•ned b an NC licensed •rofessional? Yes
DRY POND MDC FROM 02H .1062
18 SHWT elevation (fmsl) N/A
_ 19 Elevation of the bottom of the dry pond (fmsl) 554.00
20 Distance from bottom to SHWT (feet) N/A
21 Elevation of the temporary pool during the design storm (feet) 554.87
22 Ponding depth of the design storm (feet) 4 ft
23 Will the dry pond be uniformly graded to flow toward the outlet? Yes
24 Is a low flow channel being provided? No
25 Are the inlet(s) and outlet located in a manner that avoids short- Yes
circuiting?
26 Will berms or baffles be provided to increase the flow path? Yes
27 What method of pretreatment will be provided? N/A
28 Design volume of SCM (cu ft) 6106.57
29 Diameter of drawdown orifice (in) N/A
30 Drawdown time for the temporary pool (hours)
Does the pond minimize impacts to the receiving channel from the
31 Yes
1-yr, 24-hr storm?
32 Is there a small permanent pool near the orifice to prevent No
clogging?
33 Will the outlet be designed to prevent clogging? Yes
34 Are the dam and embankment planted in non-clumping turf grass? Yes
35 Species of turf that will be used on the dam and embankment Wetland Mix
36 Will trees and shrubs be prevented from growing on the dam and Yes
embankment?
ADDITIONAL INFORMATION
37 Please use this space to provide any additional information about
the dry pond(s):
Dry Pond 6 3:14 PM 6/13/2024