SW3191103_Supplemental EZ Form_11/18/2019

SUPPLEMENT-EZ FORM COVER PAGE
Please indicate the types, quantities and locations of SCMs that will be used on this project:
Quantity Location(s)
Infiltration S sty em
Bioretention Cell _ _
Wet Pond 1' Northern comer of site
Stormwater Wetland
Permeable Pavement i
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:
Michael Theberge, P.E. - Project Manager
Organization:
Bahler Engineering
Street address:
1927 S. Tryon St_ Suite 310
City, State, Zip:
Charlotte, NC 28203
Phone number(s):
980 272 3400
Email:
[e-mail]
Designer
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Signature of Designer
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Date
Applicant:
Project Name:
Poplin Meadows Phase III
Address
5906 Bonterra Village Way
City / Town
Indian Trail, NC
Company: iuid lulah. t 11C
Contact Dennis Moser
Mailing Address: 231 Post Office Drive, Suite B-8
City, State, Zip: Indian Trail, NC 28079
Phone number(s):'704 882 1700
Email: [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
- 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
information including the possibility of fines and imprisonment for knowing
violations as well as a report being made to my professional board.

WET POND
Poplin Meadows Phase HI
E 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)
sf
Parking / driveway (sq ft) 38470 sf
Total surface water area (sq ft)
sf
Sidewalk (sq ft) 23347 sf
Total drainage area (sq ft)
588197 sf
Roof (sq ft) 191700 sf
SUA associated with existing development (sq ft)
24698 sf
Roadway (sq ft) 77311 sf
Proposed new BUA (sq ft)
372083 sf
Other, please specify in the comment box below (sq ft) 41255 sf
Percent BUA of drainage area
63%
ITotal BUA (sq ft) 372083 sf
CE WITH THE APPLICABLE STOFSAMTER PROGRAM
Stormwater program(s) that apply (please specify): Design rainfall depth (in) 1.0 in
Minimum volume required (cu ft) 31118 cf
Design volume of SCM (cu ft) 32082 cf
GENERAL ANDC FPAW QZ .
1 Is the SCM sized to treat the SW from all surfaces at build -out? Yes
7 If appifcable, with the SCM be cleaned out after construction? Yes
Is the SCM located on or near contaminated soils? No
Does the mainetenance access comply with General MDC ($)? Yes
#3 What are the side slopes of the SCM (H:V)? 3:1
#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? No
#10 If the SCM is on a single family lot, does the plat comply with General MDC (10)?
Are the inlets, outlets, and receiving stream protected from erosion (10-yearstorm)? Yes
#11 Is there an O&M Agreement that complies with General MDC (11)? Yes
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
What is the method for dewatering the SCM for maintenance? Pump (preferred)
13 Was the SCM designed by an NC licensed professional? Yes
VINT POND MDC FROM MR JA53
#1 Method used SA/DA
#6 Width of the vegetated shelf (feet) 6 ft
#1 Surface area of the main permanent pool (square feet) 14535 sf
W Location of yegetalteel shelf I Submerged
1 Volume of the main permanent pool (cubic feet) 54563 cf
#6 Elevation of tup of shelf I) 617.50
2 Average depth of the main pool (feet) 1 4 ft
#5 Elevation of bottom of shelf (fmsl) 616.50
Was the vegetated shelf included in the calculation of averaae depth? No
96 Stope of vegotaWd shelf (H:V) 6:1
#2 Elevation of the bottom of the permanent pool fmsl 612.00
97 Diameter of drawdown orifice (kg*") 2.5 in
#2 Elevation of the top of the permanent pool (fmsl) 617.50
97 Drawdown time for the tempos pond (hours) 58.80
#2 Elevation of the top of the temporary pool (fmsl) I 619.10
#7 Does the orifice drawdown from below the Wp surface of the.permanent pool? No
#3 Depth provided for sediment storage (inches) 6 in
i
#8 Does the pond minimize impacts to the receiving channel from the 1-yr, 24-hr storm? Yes
64 Are the inlet(s) and outlet located in a manner that avoids short- imuiting? Yes
#9 Are fountains proposed? No
#4 Describe arty measures, such as berms or baffles, that will be taken to improve the flow path:
If yes is documentation provided per Wet Pond MDC (s)?
A permanent rip rap berm will be constructed between the forebay and the main pool
#10 Is a trash rack or other device provided to protect the outlet system? Yes
#5 Volume of the forebay (cubic feet)
10371
#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 Bermuda
#5 Depth of forebay at entrance (inches)
60 in
Ml Describe the planting plan for the vegetated shelf:
95 Depth of forebay at exit (inches)
48 in
Swanv Milkweed - 23% of veg. shelf
VMft turtlehead - 35% of veg. shelf
rerdwW flower - 42% of veg. shelf
#5 Does water flow out of the forebay in anon -erosive manner?
Yes
#5 Clean -out depth for forebay (inches)
6 in
#5 Will the forebay be cleaned out when the depth is reduced to less than the above?
Yes
ADDITIONAL D FORMATION
Please use this space to provide any additional information about this wet poW that ypu think is relevant to the review:
Other BUA breakdown: 11325sf offsite, 230sf community mail kiosk, 9900sf future unit patios, 200sf per lot (.19800sl rotal) additional allowance