20180029 Ver 1_Stormwater Info_20180315

WET POND
1
Drainage area number
Total coastal wetlands area (sq ft) - Parking / driveway (sq ft)
Total surface water area (sq ft) - Sidewalk (sq ft)
Total drainage area (sq ft)6363680 sf - Roof (sq ft)
BUA associated with existing development (sq ft) - Roadway (sq ft)
Proposed new BUA (sq ft)6139782 sf - Other, please specify in the comment box below (sq ft) 6139782 sf
Percent BUA of drainage area 96.48%Total BUA (sq ft)6139782 sf
Design rainfall depth (in)1.0 in
Minimum volume required (cu ft)486999 cf
Design volume of SCM (cu ft)491339 cf
#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)?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)?
#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?Drawdown Orifice #13 Was the SCM designed by an NC licensed professional?Yes
#1 Method used SA/DA #6 Width of the vegetated shelf (feet)6 ft
#1 Surface area of the main permanent pool (square feet)116538 sf #6 Location of vegetated shelf Above Normal Pool
#1 Volume of the main permanent pool (cubic feet)985916 cf #6 Elevation of top of shelf (fmsl)651 ft
#2 Average depth of the main pool (feet)8.46 #6 Elevation of bottom of shelf (fmsl)650 ft
#2 Was the vegetated shelf included in the calculation of average depth?No #6 Slope of vegetated shelf (H:V)6:1
#2 Elevation of the bottom of the permanent pool (fmsl)641.50 #7 Diameter of drawdown orifice (inches)10.0 in
#2 Elevation of the top of the permanent pool (fmsl)650.00 #7 Drawdown time for the temporary pool (hours)52 hrs
#2 Elevation of the top of the temporary pool (fmsl)653.37 #7 Does the orifice drawdown from below the top surface of the permanent pool?Yes
#3 Depth provided for sediment storage (inches)6 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
#9 If yes, is documentation provided per Wet Pond MDC (9)?
#10 Is a trash rack or other device provided to protect the outlet system?Yes
#5 Volume of the forebay (cubic feet)187076 #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 Fine Fescue
#5 Depth of forebay at entrance (inches)108 in #11 Describe the planting plan for the vegetated shelf:
#5 Depth of forebay at exit (inches)84 in
#5 Does water flow out of the forebay in a non-erosive manner?Yes
#5 Clean-out depth for forebay (inches)48 in
#5 Will the forebay be cleaned out when the depth is reduced to less than the above?Yes
Egger Wood Products
Break down of BUA in the drainage area (both new and existing):
COMPLIANCE WITH THE APPLICABLE STORMWATER PROGRAM
Stormwater program(s) that apply (please specify):
401 Certification
1. At 96.48% imperviours and davg=8', by the SA/DA chart the main pool surface area required is 107,782 sf. Main pool surface area provided is 116,538 sf. 2. Pond has two forebays. Forebay volume above inclues both. 3. BUA other: All of the
drainage area was assumed impervious execpt for pond slopes and drainage area to storm drain inlet 211 (223,889 sf total).
WET POND MDC FROM 02H .1053
#4 Describe any measures, such as berms or baffles, that will be taken to improve the flow path:
Shelf is planted at 50 plants per 200 sf (2,852 plants.) Species: Lance-leaf Coreopis, Purple Coneflower, Black-eyed Susan
and Scarlet Rose Mallow.
ADDITIONAL INFORMATION
Please use this space to provide any additional information about this wet pond that you think is relevant to the review:
GENERAL MDC FROM 02H .1050
THE DRAINAGE AREA
Wet Pond 1 1:01 PM 3/15/2018
Strickland, Bev
From: Neal Tucker <[e-mail]>
Sent: Thursday, March 15, 2018 1:17 PM
To: Mcdaniel, Chonticha
Cc: Homewood, Sue; Wilbur Christmas; Brad Luckey ([e-mail])
Subject: [External] RE: Egger Wood Products IP DWR#2018-0029
Attachments: 17-212 Egger_SSW-SuppEZ-20170329-DEMLR-SW.PDF; 17-212 Egger SWM O&M
Agreement - SIGNED.PDF; 17-212 Egger SWM Access Easement Exhibit.pdf
External email. Do not click links or open attachments unless verified. Send all suspicious email as an attachment to
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Chonticha,
Attached you will find the following as requested:
1. SSW Supplement EZ Form. Wilbur Christmas is unavailable today to sign and seal the form, so I have signed in
his absence. I have been involved in the design of the pond throughout the process and am comfortable signing
the form. If you would like, Wilbur can sign and form and resubmit when he returns next week so that the
signature and seal match the plans. Please let me know if this is necessary.
2. The O&M agreement which has been signed by the Owner.
3. The SWM Maintenance Access easement is highlighted in green on the exhibit. We just received this yesterday
and were not able to get it on the drawing for submittal today. We will update the plans showing the easement
and submit early next week. Please accept this exhibit in the interim.
Thank you.
Neal
J. Neal Tucker, P.E. Partner/ Director of Civil Engineering
336.723.1067 x1104 I cell: 336.817.2524
. ..m
From: Mcdaniel, Chonticha <[e-mail]>
Sent: Thursday, March 1, 2018 12:26 PM
To: Neal Tucker <[e-mail]>
Cc: Homewood, Sue <[e-mail]>
Subject: RE: Egger Wood Products IP DWR#2018-0029
Neal,
I finished my review on the stomwater management plan submitted for the subject project and have only a few
comments below:

1. Please complete and provide stormwater supplement form for the proposed wet pond. The "Supplement EZ
form" can be downloaded at the website https://deg.nc.gov/about/divisions/energy-mineral-land-
resources/energy-mineral-land-permit-guidance/stormwater-bmp-manual.
2. Please complete and provide O&M form for the proposed wet pond. The "O&M EZ form" can be downloaded
from the same website link provided above.
3. Please modify one of the engineering drawings to include delineation of the maintenance access (min 10'
required and extend to the nearest public right-of-way) and easements.
Please send the requested information directly to me (via email is ok) within 15 days. Feel free to let me know if you
have any questions. Thank you!
Chonticha McDaniel
401 Stormwater Engineer
401 & Buffer Permitting Branch
Division of Water Resources
Department of Environmental Quality
919-807-6379 office
chonticha.mcdaniela-ncdenr.gov
Mailing Address - 1617 Mail Service Center, Raleigh, North Carolina, 27699-1617
Street Address - 512 N. Salisbury St, Raleigh, North Carolina, 27604
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