20120776 Ver 1_More Info Letter_20120917

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NCDEE R
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Charles Wakild, PE Dee Freeman
Governor Director Secretary
September 17, 2012
DWQ# 12 -0776
Watauga/Ashe County
CERTIFIED MAIL: 7011 1570 00018545 8517
RETURN RECEIPT REQUESTED
Mr. Greg Young
Town of Boone
567 W. King Street
Boone, NC 28607
Re: Section 401 Water Quality Certification application
Dear Mr. Young:
On August 15, 2012, the North Carolina Division of Water Quality (Division) received a copy of your application for a
401 General Water Quality Certification install a fill in streams and wetlands for the Town of Boone Water System
Improvements in Boone, NC in Watauga County. Additional information is required in order that we may determine your
project's compliance with 15A NCAC 2H.0500. The Division will require this information in order to process your
application to impact protected wetlands and/or streams on the subject properties. Therefore, we will place this project on
hold as incomplete until we receive this additional information, and if we do not receive the additional information
requested below, we will return your application as incomplete. Please provide the following information so that we may
continue to review your project.
1. Please provide a list of any parcels of land which the Town of Boone does not currently own or have easements
on at this time.
2. Please provide a table of impacts for all stream and wetland impact areas that matches the impact area identifiers
with the identifiers used in the stream determination documentation. Please also ensure that the engineering plans
call out impact areas using these identifiers. It is difficult to review this large project with multiple
nomenclatures and/or impact areas without identifiers on the plans.
3. Please provide detailed plan sheets, at a readable scale, of all impact areas that clearly identifies the exact location
of all temporary impacts and permanent impacts using shading/hatching etc. The "call outs" on the existing plan
sheets do not clearly show the exact location of impacts, installation of dewatering measures, sediment and
erosion control measures etc.
4. Please provide detailed plan sheets at a readable scale that clearly shows all sediment and erosion control
measures in/near jurisdictional areas. All sediment and erosion control measures proposed within jurisdictional
areas must be shown as temporary or permanent impacts on the 401 application documents.
5. At culvert P -1, please explain the need for temporary impacts of 50 feet upstream and downstream of the culvert
North Carolina Division of Water Quality, Winston -Salem Regional Office
Location 585 Waughtown St Winston - Salem, North Carolina 27107 One
Phone 336 - 771 - 5000 \ FAX 336 - 771 -4630 \ Customer Service 1- 877 - 623 -6748 NorthQuohna
Internet www ncwaterquality org atura!!�
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Town of Boone Water System Improvements
DWQ# 12 -0776
September 17, 2012
Page 2 of 3
6. At culvert P -1 a proposed riffle grade control appears to be a riprap energy dissipater apron. Please clarify the
justification for this measure. If this measure is being provided as a grade control structure only, please provide
reference information/justification to indicate that long riffles of this design are appropriate for this stream.
7. At culvert P -1, please provide a design for a floodplain bench above and below the floodplain culvert. A
floodplain bench will be required to ensure that the stream channel is of natural width and depth upstream and
downstream of this double barrel culvert.
8. Please provide clarification of the dewatering technique for Meadow Creek. If a pump around will be utilized,
please provide discussion/justification for aquatic passage during construction. If a temporary channel will be
constructed, please provide a detail for the temporary channel.
9. On Page G2.5 and Page G2.6, permanent wetland impacts are identified for culvert installations. Please clarify if
there will be any temporary wetland impacts in these areas to facilitate culvert installation and/or to address
sediment and erosion control requirements. Please modify all plans and impact tables appropriately if temporary
impacts are proposed.
10. On Page G2.6 and G2.7, please clarify the need for road "stubs" at regular intervals along this access road. Please
also clarify the need for temporary impacts to wetlands and streams for these "stub" areas.
11. On Page G2.7, please explain the need for temporary impacts to 80 linear feet of stream. It appears this area may
be impacted from roadway shoulder construction. Please provide avoidance and minimization justification
(headwalls, adjustments to the road alignment, etc).
12. On Page G3.3, please clearly identify the exact location of all temporary impacts and permanent impacts. Please
also indicate all temporary impacts from sediment and erosion control measures that will be required.
13. For the culvert on Page G3.3, please clarify whether a pump around will be utilized as the dewatering technique
for this culvert.
14. For the culvert on Page G3.3, please provide a design for a floodplain bench above and below the culvert. A
floodplain bench will be required to ensure that the stream channel is of natural width and depth upstream and
downstream of this culvert.
15. For the culvert on Page G3.3, please explain the need for specified length of temporary impacts upstream and
downstream of the culvert.
16. For the culvert on Page G3.3, a proposed riffle grade control appears to be a riprap energy dissipater apron.
Please clarify the justification for this measure. If this measure is being provided as a grade control structure
only, please provide reference information/justification to indicate that long riffles of this design are appropriate
for this stream.
17. On Page G4.1, a detail is provided for Stream Bed Control. It appears that this detail is proposed for all
temporarily impacted streams. The Division requires that all temporarily impacted streams be restored to natural
conditions to the maximum extent practical. To that end, for small streams with low flow it is the Divisions
experience that riprap bed control is unnecessary. Please provide justification based on size of the stream, slope
of the stream, and/or predicted stream flow velocities for all areas that are to be restored using the detail provided
on Page G4.1. Please provide a natural channel detail with vegetation and/or erosion control matting on the
streambanks for all other stream impact areas.

Town of Boone Water System Improvements
DWQ# 12 -0776
September 17, 2012
Page 3 of 3
Please respond in writing within 30 calendar days of the date of this letter by sending a copy of this information to Sue
Homewood at the address on this letterhead, and a copy to Ian McMillan N. C. Division of Water Quality, Wetlands /401
Certification Unit, 1650 Mail Service Center, Raleigh, NC 27699 -1650. If we do not hear from you in 30 calendar days,
we will assume that you no longer want to pursue this project and we will return this application as incomplete.
This letter only addresses the application review and does not authorize any impacts to wetlands, waters or protected
buffers. Please be aware that any impacts requested within your application are not authorized (at this time) by the
Division. If you have any questions, please contact me at 336 - 771 -4964 or sue.homewood @ncdenr.gov.
Sincerely,
�� SZ
Sue Homewood
DWQ Winston -Salem Regional Office
cc: Tasha McCormick, U. S. Army Corps of Engineers, Asheville Regulatory Field Office (via email)
Ward Mariotti, WK Dickson & co, Inc. (via email)
DWQ Winston -Salem Regional Office
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