20151288 Ver 1_More Info Received_20160208

Burdette, Jennifer a
From: Bob Zarzecki <[e-mail]>
Sent: Monday, February 08, 2016 10:06 AM
To: Burdette, Jennifer a
Subject: RE: question on ITB Holdings, Wake Forest Road Mixed Use Project
Attachments: Summary of Results.pdf, Sand Filter Design.pdf, 2912 Wake Forest Road
Redevelopment Buffer Availability Letter.pdf
responseThe information that you requested on this one was provided back to you in multiple emails. I want
to make sure that you had what you needed and didn't need me to package it up into a single
before,
Bob Zarzecki
Wetlands Department Manager
Soil & Environmental Consultants, PA
From: Bob Zarzecki
Sent: Friday, February 05, 2016 5:22 PM
To: [e-mail]
Cc: [e-mail]
Subject: Fwd: question on ITB Holdings, Wake Forest Road Mixed Use Project
Sent from my iPhone
Begin forwarded message:
From: "Shinn, Josh" <[e-mail]>
Date: February 5, 2016 at 3:43:59 PM EST
To: "Devane, Boyd" <boyd.devane@nc_denr_f,,ov>
Cc: 'Bob Zarzecki' <bzarzeck0sandec.com>
Subject: RE: question on ITB Holdings, Wake Forest Road Mixed Use Project
M
Attached are PDFs of the replacement sheets for the Stormwater Impact Analysis. I changed the design
summaries to show the minimums as being greater than/equal to (>_) the value instead of equal to (=) the
value. There was already a note in the design summary that describes these minimum values. If you
think we need additional clarity on this page, please let me know. I updated the summary of results to
match the design spreadsheet. Let me know if you need anything else or would prefer me to resubmit a
new SIA notebook.
Thanks,

Josh Shinn, PE
Project Manager
Water Resources & Infrastructure
Office: 919-361-5000
Direct: 919-287-0897
Design/ng Tomorrow's hnfrostructure8 Communities
Frum:BobZaoecN[mai|to:bzaoecN(@sandec.com
Sent: Wednesday, February 0l20I64:06PM
To: Devane'Boyd
Cc: Shinn, Josh
Subject: RE: question on ITB Holdings, Wake Forest Road Mixed Use Project
AOhZarz8Cki
Wetlands Department Manager
Soil & Environmental Consultants, PA
From: Devane,Boyd
Sent: Wednesday, February 03, 2016]:5]PM
To: BnUZarzecW
Cm: Shinn,]osh
Subject: RE: question on ITB Holdings, Wake Forest Road Mixed Use Project
Jennifer had sent the note out today but forgot to copy me. Therefore, I thought you had received the
note | sent toJosh and had taken that as the official request—vvhich it wasn't. My note to Josh was the
exact words that Jennifer had included inher letter. See below:
I'm happy.
From: Devane'Boyd
Sent: Wednesday, February 03'20I6II:374M
To: Shinn, Josh
Subject: you might want to look at this.
Below is the language that I sent to Jennifer Burdette to put in the letter to the owner. Uyou see any
problems with it, please let me know.
In the "Stormvvater Impact Analysis & Preliminary Design ofStormvvater Management Facility", please
add a note of explanation or revise the placement of the "SAND FILTER SUMMARY" section to minimize
the opportunity for confusion on the "Required Sedimentation Chamber Surface Area" and "Sand Filter
Surface Area." In appearance, it seems to indicate that the sum of surface areas for the 587 sf
"Sedimentation Chamber" and the 913sf"Sand Filter" are 3337s[ Similarly, inthe second "Sand Filter
Design" page ofthe "StormwaterManagement Facility Preliminary Design [a|cu|ations" document, the

placement ofthe information could lead toconfusion. There are also some inconsistencies inthe size
calculations between the two sections of the document that need to be corrected.
From: Bob ZaoecN[mai|to�bzaoecN��sandecco
Sent: Wednesday, February 0l20I63:38PM
To: Devane'Boyd
Cc: Burdette'Jennifer a
Subject: RE: question on ITB Holdings, Wake Forest Road Mixed Use Project
11111 Fill i III 1 1111 111 1
AOhZarz8Cki
Wetlands Department Manager
Soil & Environmental Consultants, PA
From: Devane,Boyd
Sent: Wednesday, February 03, 20163:21PM
To: BnUZarzecW
Cc: Burdette,]ennifera
Subject: RE: question onITB Holdings, Wake Forest Road Mixed Use Project
Bob,
The note | sent toJosh Shinn today was just to check with him to make sure that | had stated my issues
with the plan correctly. |twas not anofficial request. That will come from Jennifer orKaren. FYI
From: Bob ZaoecN[mai|to�bzaoecN��sandecco
Sent: Wednesday, February 0l20I63:I3PM
To: Purdy, Brian ,Padiak,Andy
Cc: Jolly, Adam ,Burdette,Jennifer
aPathckSm�h Devane'Boyd
Subject RE: question onITB Holdings, Wake Forest Road Mixed Use Project
Attached is a request by DWR for additional information to assist them in their review of
our variance request. S&EC will (or already has) responded to items 1 and 2 of the
Can McAdams provide a response to Item 3 regarding the sand filter? I've copied bo
Boyd Devane & Jennifer Burdette of DWR on this request, as I believe that you may
have discussed this with Boyd already. I

WAKE FOREST MIXED USE SUMMARY OF RESULTS H. DEW, EI
2/5/2016
Design Drainage Area =
4.00
acres
Design Impervious Area =
3.50
acres
% Impervious =
87.5%
222.46
Required Sedimentation Chamber Surface Area >_
803
sf
Required Sand Filter Surface Area >_
1248
sf
Required Sed Chamber and Sand Filter Surface Area >_
4560
sf
Design Drainage Area =
16.64
acres
Design Impervious Area =
13.31
acres
% Impervious =
80.0%
222.46
Vault Length =
113
It
Vault Width =
50
It
Vault Height =
10
It
Vault Volume =
56,500
cf
Water Quality Volume =
12,161
cf
Maximum Temp Depth in Sand Filter =
2
It
Sand Filter Drain Time =
1.67
days
Orifice 1 Bottom Elevation =
217.0
It
Orifice 1 Datum Elevation =
217.5
in
Orifice 1 Area =
2.75
sf
Number of Openings =
2
Orifice 2 Bottom Elevation =
224.00
It
Orifice 2 Datum Elevation =
224.25
in
Orifice 2 Area =
0.5
sf
Number of Openings =
1
Weir Length =
28.00
It
Weir Crest =
226.25
It
Barrel Diameter =
54.00
in
9 of Barrels =
1.00
Upstream Invert =
217.00
It
Downstream Invert =
216.00
It
Length =
100.00
It
Slope =
0.01
ft/ft
Return Period
Inflow
[cfs]
Outflow
[cfs]
Max. WSE
[ft]
Freeboard
[ft]
2 -Year
75.96
42.11
222.46
4.54
10 -Year
102.37
55.76
224.64
2.36
25 -Year
115.95
62.55
225.74
1.26
100 -Year
133.40
92.96
226.75
0.25

WAKE FOREST MIXED USE SAND FILTER DESIGN H. DEW, EI
2/5/2016
Note: The following design calculations are based upon requirements from the 2007 NCDENR BMP Manual.
WQV = (P)(R v)(A)/12 x 43,560
where,
WQV= water quality volume (CF)
Rv = 0.05+0.0090 where I is percent impervious cover
A = area in acres
P = rainfall (in inches)
Input data:
Total area, A =
4.00
acres
Impervious area=
3.50
acres
Percent impervious cover, I =
87.5
%
Rainfall, P =
1.0
inches
Calculated values:
Rv =
0.84
WQV=
0.28
acre -ft
=
12161
cf.
Determine the reauiredSedimentation Chamber Surface Area
The minimum required sedimentation chamber surface area, as computed by the Camp -Hazen equation is as follows:
A s = 0.066x WQV
where,
A s = sedimentation chamber surface area (SF)
Note: The above equations compute surface area using the Camp -Hazen equation and assume a sediment
trapping efficiency of 90%.
As = 802.59 sf. (minimum sedimentation chamber surface area required)
Determine the required Sand Filter Surface Area
The required filter bed area (A F) is computed using the following equation:
AF—[("QV)(d 011 ")(hA+dF)(t)J
where,
AF = surface area of filter bed (SF.)
WQV= water quality volume (CF)
dF = filter bed depth (feet)
k = coefficient of permeability of filter media (ft/day)
hA = average height of water above filter bed (feet)
t= design filter bed drain time (days)

WAKE FOREST MIXED USE
SAND FILTER DESIGN H. DEW, EI
2/5/2016
Input data:
WQV=
12161
cf.
dF =
1.5
ft. (18" minimum depth)
k =
0.02
gal/min/sf. (assumed at 0.02 gal/min/sf)
=
3.50
ft/day (assume 1 sf of filter media)
hmaxfilter =
2.00
ft. (max temp depth, between 2 and 6 feet)
hA =
1.0
ft. (average height of water above the filter bed)
t=
1.67
days (40 hours typical drain time)
Calculated values:
AF = 1248.3 s£ (minimum sand filter area required)
Check to see if required surface areas meet temporary storake requirements
Minimum required sand filter area, AF = 1248.3 SF (previously computed)
Minimum required sedimentation chamber area, As = 802.6 SF (previously computed)
hm�fiite,. = 2.0 feet (previously computed)
Sizing is based upon the adjusted water quality volume, WQV adt (75% of the total WQV).
WQVadj = 9120 cf. (Volume contained between the sedimentation chamber and the
sand filter - above the sand)
To meet required water quality storage requirements:
As + AF= WQVadi / h.fli,,
Desi -n Summary
Therefore,
As + AF = 4560.2 SF (minimum total sand and sedimentation chamber surface area)
Note: All three minimum surface areas must be satified for the design of the sand filter. Each of the
sand and sedimentation chambers must meet the individual surface area requirements, and the total of the
two must meet the combined minimum requirement.
As + AF >_ 4560.2 SF (minimum total sand and sedimentation chamber surface area)
AF >_ 1248.3 SF (minimum sand filter area required)
As >_ 802.6 SF (minimum sedimentation chamber area required)
hmaXslter = 2.0 (maximum ponding depth in facility)
IIA = 1.0 (average ponding depth in facility)

Statement of Buffer Mitigation Credit Availability
February 1, 2016
I.T. B. Holdings, LLC
Attn: Sherman Richardson
c/o: Mr. Bob Zarzecki
Soil & Environmental Consultants, PA
North Quarter Office Park
8412 Falls of Neuse Road
Suite 104
Raleigh, NC 27615
Re: Availability of Riparian Buffer credits for the 2912 Wake Forest Road Redevelopment project
Bank Name: WEI - Neuse 01 Nutrient Offset and Buffer Umbrella Bank
Bank Site: Buck Swamp Parcel and/or Caraway Creek Parcel
Bank Sponsor: Wildlands Holdings II, LLC (wholly owned by Wildlands Engineering, Inc.)
DWR Project #: 2012-0144
Riparian Buffer Credits Available: 63,435 sq. ft.
Neuse 03020201 River Basin
Applicable Local Government/Municipality jurisdiction: NC Division of Water Recourses
Dear Mr. Richardson:
Wildlands Holdings II, LLC has the above mentioned Riparian Buffer Credits from the WEI — Neuse 01 Nutrient
Offset and Buffer Umbrella Bank - Buck Swamp Parcel and/or Caraway Creek, (DWQ Project #: 2012-0144), to
satisfy a portion of the Riparian Buffer mitigation requirements related to the above mentioned project. The
Project is located within the service area (HUC 03020201 - non -Falls) of the Bank.
An invoice for this transaction will be sent upon your request and we will reserve the credits for a period of 30
days from invoice. This letter is not a guarantee of availability or a reservation of the credits. Final transfer of
the credits will be made upon full receipt of your payment in the amount of $1.00 per sq. ft. to Wildlands
Holding II, LLC, at which time a credit transfer certificate verifying your credit purchase will be issued to the
North Carolina Division of Water Resources and to you for your records. At that time we will require a copy of
the Riparian Buffer Authorization Approval from NC Division of Water Resources.
Note that Wildlands Holdings III, LLC is in the process of opening a Neuse 01 (not Falls) bank to be called the
Falling Creek Nutrient and Buffer Bank. This bank will most certainly have the necessary credits available for
your full buffer requirement by the end of 2016.
Wildlands Holding II, LLC; � Wildlands Engineering, Inc � 1430 South Mint Street, Charlotte, NC; 28203

We appreciate the opportunity to assist you with your mitigation requirements. Please contact me at (704) 719-
2100 or [e-mail] if you have any questions or need any additional information.
Sincerely,
Robert W. Bugg
Wildlands Engineering, Inc.
Director: Land Acquisition
[e-mail]
0: [phone] ex. 105 M: [phone]
WEI -- Bunk Swamp, LLC: - Vdildlands Engineering, Inc. - 312 Vilest Millbrook Road, Suite 225, Raleigh, NC: 27609