20120818 Ver 1_More Info Received_20120921

Homewood, Sue
From:
Tori Small [tsmall @wsaaeng.com]
Sent:
Friday, September 21, 2012 10:47 AM
To:
Homewood, Sue
Subject:
GTCC Aviation Clasroom Building PCN
Attachments:
GTCC Buffer request - rev.pdf; gtcc aviation impact 1.pdf
Sue- I attached the buffer disturbance request we sent to the City of Greensboro that details the various locations we
reviewed for the waterline construction. I also included a revised impact map for the stream crossing that details the
restoration in that area. After looking back at the plan, the area we have indicated for disturbance is the appropriate
amount. There wouldn't be any reduction for roadway area that was previously disturbed. Thanks for pointing that out
though, so I can check that on any future projects. Please let me know if you need additional information. Thanks, Tori
Victoria Waldron Small, PE
Westcott, Small & Associates, PLLC
125 S. Elm Street, Suite 606
Greensboro, NC 27401
Phone:336.310. WSAA
Direct: 336.310.1481

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July 10, 2012
Ms. Virginia Spillman, PE
Stormwater Engineering Supervisor
City of Greensboro Water Resources Dept.
PO Box 3136
Greensboro, NC 27402 -3136
RE: No Practical Alternatives Request— GTCC Aviation Classroom Building
Dear Ms. Spillman:
In accordance with City of Greensboro Ordinance Section 30- 12 -3.9G, Westcott, Small & Associates, PLLC (WSAA) is
requesting a determination of No Practical Alternatives for the steam buffer disturbance associated with the installation an
8" DIP waterline along Radar Road as required by the City of Greensboro Water Resources Department in conjunction
with the development of Guilford Technical Community College's Aviation Classroom Building at 1053 Old Stage Coach
Trail. The required waterline will be public and located in a public utility easement. As a condition of development, the
waterline must be located along the entire frontage of the property. It will extend from the existing waterline on the
southern side of N. Chimney Rock Rd. 1500' to the northern property line. The proposed impacts are as follows:
Utility, non - electric, perpendicular crossings of streams, disturbing more than 40 If but not more than 150 If of
riparian protection area with a maintenance corridor wider than 10'.
-Zone 1: 1240 sf (335 sf maintained in sewer easement, 905 sf wooded)
-Zone 2: 880 sf (430 sf maintained in sewer easement, 450 sf wooded)
Utility, non - electric, other than perpendicular crossings
-Zone 1: 2198 sf
-Zone 2: 12136 sf
The start and end points of the waterline extension were determined by the City of Greensboro Water Resources
Department. We are installing the minimum length of waterline allowed by the City of Greensboro. The waterline will be
located 20' from the existing sanitary sewer line. This is the minimum separation distance allowed by the City of
Greensboro to ensure that both the water and sewer line have 20' easements as required by the City of Greensboro. The
maintenance corridor will be equal to the width of the waterline easement. This is required by the City of Greensboro to be
a minimum of 20'. Again, the proposed design meets, but does not exceed, this minimum criteria. Designing to the
minimum constraints allowed by the City of Greensboro, results in the previously described stream buffer disturbance with
no practical alternative to reduce the amount of disturbance.
The following options to the proposed placement of the waterline crossing the stream were reviewed:
• Install waterline through the existing culvert: Not allowed per the City of Greensboro Water Resources
Department (Water Division and Stormwater Management Division). The culvert is not large enough to allow the
water pipe to pass above the culvert pipes. The installation of the waterline in the culvert cold impede stream flow
and create opportunities for the water pipe to be damaged by storm flows and debris.
125 S. Elm Street, Suite 606 e Greensboro, North Carolina 27401 e phone: 336 - 310 -WSAA e web: www.wsaaeng.com

• Install waterline at other locations along steam: Pushing the crossing further downstream would create an impact
to the stream outside of the previously disturbed area and would not decrease the amount of buffer disturbance.
The crossing is set within a previously rip- rapped area, just downstream of the existing culvert to allow room for
equipment to access the crossing. Additionally, a portion of the "impacted" buffer is within maintained sewer
easement that is regularly mowed.
The following options to the proposed placement of the waterline between the existing sanitary sewer line and stream
were reviewed:
• Do not install waterline, but access existing waterline on adjacent property: Not allowed per the City of
Greensboro Water Resources Department and Technical Review Committee. The installation of the public
waterline along the entire frontage of Radar Road is required as a condition of development.
• Install waterline to the east of the existing sanitary sewer line: Not allowed per NCDOT. Radar Rd. is an NCDOT
roadway and NCDOT does not allow new utilities under the pavement. The existing sewer line is only 6' -12' from
the existing edge of pavement. NCDOT policy requires that utilities be placed the same distance from the edge of
pavement as they are deep. The waterline would need to be 4' from the edge of pavement, but that cannot occur
and keep the required NCDWQ separation of 10' between waterline and sanitary sewer lines.
• Install the waterline closer than 20' to the existing sewer line: Not allowed per the City of Greensboro Water
Resources Department. Waterlines must be at least 10' from sanitary sewer lines and both utilities must be in
individual 20' easements. Therefore, the minimum separation allowed by the City of Greensboro Water
Resources Department between water and sewer in this case is 20'. The purpose of this requirement is to insure
that construction and future maintenance of either line does not undermine or damage the other line.
• Replace existing sewer line material with ductile iron pipe: Does not significantly reduce buffer impact and not
economically feasible for a publically funded project. Because the sewer line is in use, the flow through the lines
would need to be placed in a parallel line while the sewer line was being replaced. This additional construction
would create an impact to the buffer equal to the impact created by simply installing the waterline as proposed.
Further, the cost of replacing the existing 8" sewer line with ductile iron pipe and watertight manholes with a
bypass sewer line is 2 -3 times as expensive as the cost of the waterline construction itself.
Should you need additional information, please contact me at 336.310.1481 or via email at tsmall @wsaaeng.com.

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