20100063 Ver 1_More Info Received_20100727

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11010 RAVEN RIDGE ROAD
RALEIGH, NC 27614
846-5900
DWQ
2321 CRABTREE BLVD
RALEIGH, NC 27604
PROJECT
SIGNATURE f .. / PRINT ,'DATE` TIME
n.-
Soil & Environmental Consultants, PA
11010 Raven Ridge Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone]
www.SandEC.com
July 27, 2010
S&EC Project # 11404.P2
DWQ Project #10-0063
NC Department of Environment and Natural Resources Q .'
Division of Water Quality -'
401 Oversight/Express Review Permitting Unit
Attn: Ian McMillan a-7'!
2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604 M*-WA1cr%QUAU1Y
?GHos?sll?
Re: Reply to the Division of Water Quality's Request for More Information
Franklin County HUB
Franklin County, NC
To Mr. McMillan:
The purpose of this letter is to respond to your Request for More Information letter dated June 28, 2010.
The original questions/requests are copied below as they appear within letter and are then followed by our
response. Additionally, modifications to the level spreader structures have resulted in a reduction of
riparian buffer impacts. Therefore sheets 7 & 8 of the Pre-Construction Notification Application have been
revised and are attached for your files.
Additional Information Requested:
A Wet Detention Pond does not provide an adequate level of total nitrogen removal (25916) to be
used in place of a level spreader (a minimum of 30% total nitrogen removal is required). At
Outlets 1 and 415, please replace the proposed wet detention ponds with stormwater wetlands. A
stormwater wetland will work in an area with a high SHWT and also provide sufficient total
nitrogen removal to be used in place of a level spreader (40916).
The wet ponds at outlets 1 & 4/5 have been replaced by level spreaders with engineered
vegetative filter strips. Please see attached calculations and plan sheets SP-07, SP-10, DF-
02 & DF-04.
2. For the level spreader designs, please address the following issues:
a. Per Item 2 of the Required Items Checklist, please provide custom plan details at a 1" =
30' scale or large with 1 ' topographic lines, showing proposed topo and its connection to
existing topo. On these details, please include specific details on the proposed flow
splitting devices with correct swale dimensions, invert elevations, etc.
Please see the custom details that are now shown at V = 20' on sheets DF-02 thru DF-10.
The detailed information includes 1' topographic lines, proposed contours connecting to
existing contours, concrete flow splitting devices, swale dimensions and spot elevations.
b. The flow splitting devices must be equipped with concrete weirs to split flow between the
input and bypass swa/es. Please clearly show the weir elevations on the plan details and
provide the calculations used to set the weir elevations.
Charlotte Office: Greensboro Office:
Phone: [phone] Phone: [phone]
Fax: [phone] Page 1 of 2 Fax: [phone]
Please see the flow splitting devices that have been changed to concrete on sheets DF-02
thru DF-10. The weir elevations and calculations have also been provided.
c. The filter strip must be straight in plan view (an issue for level spreaders 6 and 7).
The filter strips on level spreaders 6 & 7 have been modified, please see sheets DF-05 &
DF-06.
d. The bypass channel must enter the stream at an angle (an issue for level spreader 6).
The bypass channel has been removed from level spreader 6. The level spreaders have
been sized for the 10 year storm.
e. For level spreader 7, please show 1' contours downslope of the level lip. Please explain
the choice of discharge location for the bypass channel (for example, it could be an
existing natural draw).
The existing contours have been added to level spreader 7. The bypass channel has been
removed. The level spreaders have been sized for the 10 year storm.
3. The Operation and Maintenance Agreements must be signed and notarized.
The Operations and Maintenance Agreements have now been signed & notarized, please
see attached.
We anticipate that this answers all of the DWQ's questions in order to complete the final review process
requested for the written concurrence of Water Quality Certification 3820 & 3821 and Riparian Buffer
Authorization. If you have any further questions or any additional explanation is needed, please don't
hesitate to give me a call at [phone].
Sincerely,
SOIL & ENVIRONMENTAL CONSULTANTS, PA
Kevin Martin
Environmental Specialist
CC:
Ronnie Goswick-Franklin County EDC
Attachments:
1) Revised Impact Exhibits-sheets 1 of 5 thru 5 of 5
2) Revised Sheets 7 & 8 of the PCN
3) Franklin Count HUB Road Connection Road-US 401 to Franklin Co. Municipal Airport-Permitting
Plans
4) Diffuse Flow Calculations Binder
5) Signed & Notarized Operations & Maintenance Agreements
6) S&EC Detailed Soils Evaluation Report
7) Data CD (one copy)
Page 2 of 2
REVISED-JULY 27, 2010
6. Buffer Impacts (for DWQ)
If project will impact a protected riparian buffer, then complete the chart below. If yes, then individually list all buffer impacts
below. If an impacts require mitigation, then you MUST fill out Section D of this form.
6a.
? Neuse ®Tar-Pamlico ? Other:
Project is in which protected basin? ? Catawba ? Randleman
6b. 6c. 6d. 6e. 6f. 6g.
Buffer impact number
- Permanent (P) or Reason for impact Buffer Zone 1 impact Zone 2 impact
Temporary (T) Stream name mitigation (square feet) (square feet)
re uired?
B1 (#1) ® P ? T Bypass Channel - UT to Cedar ®
s 1,250* 930*
Outlet #1 Creek No
B3 (#3) ® P ? T Road Crossing UT to Cedar
Creek ® Nos 7,188 4,205
B4 (#4) ® P ? T Road Crossing UT to Cedar
Creek ® Nos 7,291* 4,754'
B5 (#5) ® P ? T Road Crossing UT to Cedar
Creek ® Nos 8,637 5,003
6h. Total buffer impacts 24,366* 14,892*
6i. Comments: *Please note buffer impact B2 (#2), B6 (#5B) & B7 (#4B), as shown in the revised PCN dated June 15,
2010, have been removed. Impacts B1 (#1) and B4 (#4) have been modified.
Page 7 of 14
REVISED-JUNE 15. 2010
D. Impact Justification and Mitigation
1. Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
The proposed project includes an industrial park and the Airport Road Extension. The industrial park currently
includes a conceptual design, with 21 lots. All lots are developable without further impacts to wetlands/streams or
riparian buffers, lots lines and setbacks are identified on the Triangle North Franklin County Master Plan, dated
March 2010. The Airport Road Extension will connect the existing Airport Road with Highway 401. This proposed
road was designed to minimize impacts to the maximum extent practicable. The road extension is approximately
1.3 miles long and only includes 4 crossings of streams and/or wetlands. Specifically, Impact Area 1, is a riparian
buffer impact for a bypass channel for a stormwater BMP. Impact Area 3 is a proposed road crossing on an
unimportant/intermittent stream; this crossing has been designed to avoid larger areas of wetlands to the southwest.
Impact Area 4 is a proposed road crossing on an important/perennial stream, this crossing is designed at a near
perpendicular angle. Impact Area 5 is a proposed road crossing on an important/perennial stream, this crossing is
designed with wing walls and in an area avoiding wetlands to minimize impacts to streams and wetlands. Impact
Area 6 is a proposed road crossing on two wetland fingers.
With regard to the proposed force main outside of the project boundaries (see Kerr-Tar Regional EDC Triangle
North Franklin Lift Station and Force Main USGS & Soil Survey maps dated March 2, 2010), this force main is being
installed within the existing transportation facility. Therefore, through email correspondence with Amy Chapman on
February 25, 2010, she verified that "buffer impacts within the existing transportation facility are exempt from the
Buffer rules". With regard to the utilities being proposed within the project boundaries, these utilities will be installed
within the proposed road corridor (i.e. shoulders) and will be covered within the impacts proposed for the Airport
Road Extension.
Additionally, it is important to note that the major changes in the current impact areas is because S&EC flagged Top
of Bank and re-flagged areas of the wetlands within the road crossing areas, these areas have now been surveyed
vs. the previous submittal that included GPS data only. Therefore, accurate lengths of streams and areas of
wetlands have resulted in an increase in overall impacts.
Furthermore, the applicant is aware of the regional conditions associated with the Nationwide Permits 14 & 39.
With respect to development conditions (NWP 39-Regional Conditions section 4.0) the applicant does not anticipate
any impacts to streams or wetlands associated with stormwater facilities, there are no impact associated with
single-family recreation facilities, and we are requesting the use of 39 for Impact Area #'s 3, 4 & 6 therefore there
are no permanent wetland or stream fills proposed within the floodway/floodplain for these impacts and the stream
classification for this project is C, NSW (i.e. not Outstanding Resource Waters, High Quality Waters, Coastal
Wetlands or wetland adjacent to these waters). With respect to linear transportation crossings conditions (NWP 14-
Regional Conditions section 4.0) the applicant does not anticipate any stream relocations; all culverts have been
sized appropriately in order to accommodate bank-full flows and will be buried the appropriate depth below the
streambed to allow for aquatic life passage; and this project is not being used in conjunction with a NWP 18 to
create an upland area.
1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
Erosion & Sediment Control plan will require measures to protect water quality during construction activities.
2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a. Does the project require Compensatory Mitigation for ® Yes ? No
impacts to Waters of the U.S. or Waters of the State?
2b. If yes, mitigation is required by (check all that apply): ® DWO ® Corps
Page 8 of 14
PCN Form - Version 1.3 December 10, 2008 Version
GRAPHIC SCALE
50 0 25 50 100 200
( IN FEET )
1 inch = 50 ft.
50' Riparian oo \
Buffer (Typ.) \COI
\\ Existing Stream (Typ.)
N
>. \ o Limit of Disturbance (Typ.)\
O
O
Q)
•\ 314 3`6?
0 (z)
Buffer Impact #1
Zone 1 1,250 S.E. A ?, k
Zone 2 930 S.F.
. .. \
315
DESCRIPTION;
FRANKILN COUNTY IMPACT MAP
MUNICIPAL AIRPORT
FRANKLIN COUNTY, NORTH CAROLINA DRAWING SCALE: DESIGNED DRAWN BY
1 "= 50' TFW TFW
Hobbs, Upchurch & Associates, P.A. DRAWING SET NO.: SHEET OF
Consulting Engineers, Surveyors & Land Planners W-1 1 5
Southern Pines, North Carolina 28387
300 S.W. Broad Street, Southern Pines, North Caroline 28387 ISSUE DATE:
Phone: [phone] - Fax: [phone]/10
GRAPHIC SCALE
50 0 25 50 100 200
( IN FEET )
1 inch = 50 ft.
N
°, Roadway Fill © Culvert No. 2
395 SF of Permanent Wetland
\ Impact #3 0.0091 Ac.
177 SF of Temporary Wetland
Impact #3 0.0041 Ac.
29S
50' Riparian
Buffer (T'
Buffer Impact #3 29C)
Zone 1 7,188 S.F.
Zone 2 4,205 S. F.
Existing Stream (Typ.)
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0 ?Exlsting?
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280"
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xisting
Wetland.:
2 75
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Culvert No. 2\
\ \ 120 LF of Stream Impact #3
-- \ 300 SF /0.0069 Ac.
\
Limit of Disturbance (Typ.)
V,
IJ
DESCRIPTION;
FRANKILN COUNTY IMPACT MAP
MUNICIPAL AIRPORT
FRANKLIN COUNTY, NORTH CAROLINA DRAWING SCALE: DESIGNED DRAWN BY
1 "= 50' TFW TFW
Hobbs, Upchurch & Associates, P.A. DRAWING SET NO.: SHEET OF
Consulting Engineers, Surveyors & Land Planners W-2 2 5
Southern Pines, North Carolina 28387
300 S.W. Broad Street, Southern Pines, North Carolina 28387 ISSUE DATE:
Phone: [phone] - Fax: [phone] 07120110
GRAPHIC SCALE
50 0 25 50 100 200
( IN FEET )
1 inch = 50 ft.
Roadway Fill @ Culvert No. 4
?zd, ?? . 2,558 SF of Permanent Wetland
`SO Impact #4 0.0587 Ac.
632 SF of Temporary Wetland
Buffer Impact #4 Road
Zone 1 7,291 S. F. 255 _.,.Impact #4 0.0145 Ac.
,\\
\ Zone 2 4'754 S. F.
\ \ Culvert No. 4
124 LF of Stream Impact #4
Limit of Disturbance (Typ.) 626 SF
?\ I \ 0.0144 Ac.
245?? N \ o
:3
Existing Wetland CD 0
Existing Wetland\\\\ o
?o
0
J
Existing Stream (Typ.)
DESCRIPTION;
FRANKILN COUNTY IMPACT MAP
MUNICIPAL AIRPORT
FRANKLIN COUNTY, NORTH CAROLINA DRAWING SCALE: DESIGNED DRAWN BY
"=50' TFW TFW
Hobbs, Upchurch & Associates, P. A. 1 DRAW N G SET N 0.: SHEET F O F
r%qj Consulting Engineers, Surveyors & Land Planners W-3 3 5
Southern Pines, North Carolina 28387
300 S.W. Broad Street, Southern Pines, North Carolina 28387 ISSUE DATE:
Phone: [phone] - Fax: [phone]/10
GRAPHIC SCALE
50 0 25 50 100
( IN FEET )
1 inch = 50 ft.

o°
50' Riparian
Buffer (Typ.)
?o,e ?? 30 20'
\2? `30 Zone\ 1 Zone 2
Existing Stream (Typ.)
Culvert No. 5
200
114 LF of Permanent Stream
Impact #5 1,320 SF, 0.0303 Ac.
42 IF of Temporary Stream
Impact #5 749 SF, 0.0172 Ac.
Buffer Impact #5 Road
233 Zone 1 8,637 S.F.
Zone 2 5,003 S.F.
f \.
Limit of Disturbance (Typ.)
3
\
6
DESCRIPTION;
FRANKILN COUNTY IMPACT MAP
MUNICIPAL AIRPORT
FRANKLIN COUNTY, NORTH CAROLINA DRAWING SCALE: DESIGNED DRAWN BY
1 "_ 50' TFW TFW
Hobbs, Upchurch & Associates, P.A. DRAWING SET NO.: SHEET OF
Consulting Engineers, Surveyors & Land Planners W-4 4 5
Southern Pines, North Carolina 28387
300 S.W. Broad Street, Southern 'fines, North Carolina 28387 ISSUE DATE:
Phone: [phone] - Fax: [phone] 0
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GRAPHIC SCALE
50 0 25 50 100
( IN FEET )
1 inch = 50 ft.
........
.........-
Existing Wetland (Typ.)
200
Limit of Disturbance (Typ.)
I
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0'
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DESCRIPTION;
FRANKILN COUNTY IMPACT MAP
MUNICIPAL AIRPORT
FRANKLIN COUNTY, NORTH CAROLINA DRAWING SCALE: DESIGNED DRAWN BY
1 "= cJQ' TFW TFW
Hobbs, Upchurch & Associates, PA. DRAWING SET NO.: SHEET OF
1qj Consulting Engineers, Surveyors & Land Planners W-5 5 5
Southern Pines, North Carolina 28387
300 S.W. Broad Street, Southern Pines, North Carolina 28387 ISSUE DATE:
Phone: [phone] - Fax: [phone] 07120110