SW3200501_The Grove at Chestnut Park - SSW-SuppEZ -Submittal-signed_5/5/2020

SUPPLEMENT-EZ FORM COVER PAGE
Fnvlronmer
Qualify
Please indicate the types, quantities and locations of SCMs that will be used on this project:
Quantity
Location(s)
Infiltration System
Bioretention Cell
Wet Pond
1
To the east of Townhome Unit #1
Stormwater Wetland
Permeable Pavement
Sand Filter
Rainwater Harvesting
Green Roof
Level Spreader -Filter Strip
Disconnected Impervious Surface
Treatment Swale
Dry Pond
Designer information for this project:
Name and Title:
Organization:
Street address:
City, State, Zip:
Phone number(s):
Email:
Designer
AL
038830
�W R\04/24/2020
Matthew R. Reiking, P.E
ESP Associates, Inc.
3475 Lakemont Blvd.
Fort Mill, SC 29708
803-802-2440
[e-mail]
Applicant:
Project Name:
The Grove at Chestnut Park
Address
251 Chestnut Parkway
City / Town
Indian Trail
Company:
Mattamy Carolina Corporation
Contact:
Brian Johnson
Mailing Address:
2127 Ayrsely Town Blvd. Suite 202
City, State, Zip:
Charlotte, NC 28273
Phone number(s):
980-859-4380
Email:
I [e-mail]
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
Signature of Designer - that the engineering plans, specifications, operation and maintenance
agreements and other supporting information are consistent with
the information provided here.
I am aware that there are significant penalties for submitting false
04/24/2020 information including the possibility of fines and imprisonment for knowing
Date violations as well as a report being made to my professional board.
UARO��,
. LICENSE NO.:
o. F-1407
,so ii i10
Cover Page 1 10:23 AM 4/21/2020

WET POND
The Grove at Chestnut Park
THE DRAINAGE AREA 1
Drainage area number
1
Break down of BUA in the drainage area (both new and existing):
Total coastal wetlands area (sq ft)
0.00 sf
- Parking / driveway (sq ft)
34848.00 sf
Total surface water area (sq ft)
0.00 sf
- Sidewalk (sq ft)
23958.00 sf
Total drainage area (sq ft)
322779.60 sf
- Roof (sq ft)
98010.00 sf
BUA associated with existing development (sq ft)
0.00 sf
- Roadway (sq ft)
59241.60 sf
Proposed new BUA (sq ft)
216057.60 sf
- Other, please specify in the comment box below (sq ft)
Percent BUA of drainage area
66.94 %
Total BUA (sq ft)
216057.60 sf
COMPLIANCE WITH THE APPLICABLE STORMWATER PROGRAM
Stormwater program(s) that apply (please specify):
IDesign rainfall depth (in)
1.0 in
Minimum volume required (cu ft)
17549.24 cf
Design volume of SCM (cu ft)
17549.24 cf
GENERAL MDC FROM 02H .1050
#1 Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
#7 If applicable, with the SCM be cleaned out after construction?
Yes
#2 Is the SCM located on or near contaminated soils?
No
#8 Does the mainetenance access comply with General MDC (8)?
Yes
#3 What are the side slopes of the SCM (H:V)?
2:1
#9 Does the drainage easement comply with General MDC (9)?
Yes
#3 Does the SCM have retaining walls, gabion walls or other engineered side slopes?
Yes
#10 If the SCM is on a single family lot, does the plat comply with General MDC (10)?
#4 Are the inlets, outlets, and receiving stream protected from erosion (10-year storm)?
Yes
#11 Is there an O&M Agreement that complies with General MDC (11)?
Yes
#5 Is there a a bypass for flows in excess of the design flow?
Yes
#12 Is there an O&M Plan that complies with General MDC (12)?
Yes
#6 What is the method for dewatering the SCM for maintenance?
Pump (preferred)
1#13 Was the SCM designed by an NC licensed professional?
Yes
WET POND MDC FROM 02H .1053
#1 Method used
HRT
#6 Width of the vegetated shelf (feet)
6 ft
#1 Surface area of the main permanent pool (square feet)
12085.00 sf
#6 Location of vegetated shelf
@ Normal Pool
#1 Volume of the main permanent pool (cubic feet)
51682.50 cf
#6 Elevation of top of shelf (fmsl)
686.00
#2 Average depth of the main pool (feet)
7.00 ft
#6 Elevation of bottom of shelf (fmsl)
685.00
#2 Was the vegetated shelf included in the calculation of average depth?
Yes
#6 Slope of vegetated shelf (H:V)
6:1
#2 Elevation of the bottom of the permanent pool (fmsl)
686.00
#7 Diameter of drawdown orifice (inches)
2.0 in
#2 Elevation of the top of the permanent pool (fmsl)
686.00
#7 Drawdown time for the temporary pool (hours)
54.72 hrs
#2 Elevation of the top of the temporary pool (fmsl)
687.44
#7 Does the orifice drawdown from below the top surface of the permanent pool?
No
#3 Depth provided for sediment storage (inches)
6.00 in
#8 Does the pond minimize impacts to the receiving channel from the 1-yr, 24-hr storm?
Yes
#4 Are the inlet(s) and outlet located in a manner that avoids short-circuiting?
Yes
#9 Are fountains proposed?
No
#4 Describe any measures, such as berms or baffles, that will be taken to improve the flow path:
#9 If yes, is documentation provided per Wet Pond MDC (9)?
Earthen Forebay Berm, LW ratio.
#10 Is a trash rack or other device provided to protect the outlet system?
Yes
#5 Volume of the forebay (cubic feet)
8683.00 cf
#11 Are the dam and embankment planted in non -clumping turf grass?
Yes
#5 Is this 15-20% of the volume in the main pool?
Yes
#11 Species of turf that will be used on the dam and embankment
Rye/Fescue
#5 Depth of forebay at entrance (inches)
120 in
#11 Describe the planting plan for the vegetated shelf:
#5 Depth of forebay at exit (inches)
120 in
Bottom One Third - Scirpus Atrovirens (Dark -Green Bulrush) planted from 685.00 to 685.33
Middle One Third - Scirpus Pungens (Common Threesquare) planted from 685.33 to 685.66
Upper One Third - Juncus Effusus (Soft Rush) planted from 685.66 to 686.00
#5 Does water flow out of the forebay in a non -erosive manner?
Yes
#5 Clean -out depth for forebay (inches)
42 in
#5 Will the forebay be cleaned out when the depth is reduced to less than the above?
Yes
ADDITIONAL INFORMATION
Please use this space to provide any additional information about this wet pond that you think is relevant to the review:
Design -build retaining wall is proposed from the top of vegetated shelf (686.00) to top of dam (691.00) elevation around entire perimeter of wet pond no. 1.
Wet Pond 1 4:10 PM 4/27/2020