20180307 Ver 2_Additional Information from Christyn_20180119

Strickland, Bev
From: Fertenbaugh, Christyn L
Sent: Friday, January 19, 2018 4:51 PM
To: Jason Marshall; [e-mail]
Cc: Higgins, Karen
Subject: Additional Information for Stevens Creek Variance WCS
Hello,
We have reviewed the variance request regarding the Stevens Creek Trunk Sewer Phase 1, with a variance needed for
construction utilizing PVC within a stream buffer. In accordance with the provisions of 15A NCACO2T.0105(n) for
alternative design criteria, please provide the following information:
General Comments:
As the entirety of this project is shown to be constructed within the 200 -foot buffer as required by 15A NCAC
028, and multiple areas constructed within the 50 -foot buffer, please provide clarification as to what design
alternatives were considered to potentially avoid these impacts. Please also provide more information about
how the project construction/materials as depicted on the provided plans shall meet the requirements of 15A
NCAC 02T.0105(n); and specifically, how they shall provide equal or better protection of the environment in this
area.
2. It appears that the alignment of the buffers as shown on the plans (30-, 50-, and 200 -feet) is based on a
proposed stream alignment, not the existing alignment. Please provide more information regarding the
proposed realignment of the stream, as this affects the buffer zones through which this project is proposed to
be constructed.
a. It also appears that the 100 -year flood elevation lines are based on the existing creek alignment rather
than the proposed alignment. Please provide more information, as this affects the installation of
different manhole -types, per 15A NCAC 02T.0305(e).
3. As this project requests the usage of PVC in most locations whereas both the 02T and 028 rules require ductile
iron within such a buffer, please provide clarification as to why ductile iron cannot be utilized for this project.
4. The provided VAR 10-2013 form indicates that sewer lines located in wetland areas shall have anti -seep collars
installed, however, it was not clear where wetland areas are impacted nor where anti -seep collars may be
installed. Please clarify.
Plans/Specifications:
1. All plans and specifications submitted for the variance must be signed/sealed by a Professional Engineer licensed
to practice in North Carolina. Please revise.
Brief sections of specifications were provided. Please clarify if these are parts of Charlotte Water's standard
specifications, which are referenced by the provided plan sheets. All specifications to be referenced by this
variance that are not part of Charlotte Water's standard specifications must be signed/sealed by a Professional
Engineer licensed to practice in North Carolina.
3. Have the quality testing methods for gravity lines outlined in the provided specifications been approved by the
Public Water Supply Section — Plan Review Group as being equivalent to water main standards as found in 15A
NCAC 18C, per 15A NCAC 02T.0305(g)(5)? If so, please provide a copy of the letter or email approving the testing
methods. If this has not yet been verified, please contact the Plan Review Team Leader Shashi Bhatta at
[e-mail].

4. It appears that multiple manholes depicted as being located within the current 100 -year flood elevation are
listed as having vented covers (e.g. MH -17, 19, 20, 24, 25). All manholes located within the 100 -year flood
elevation must have a watertight seal, per 15A NCACO2T.0305(e). Please revise such that all manholes located
within the 100 -year flood elevation are depicted as having watertight covers and frames, and ensure that the
manhole schedule located on plan sheet 2 correctly reflects which type of manhole cover shall be installed.
a. Please note General Comment #2, as it appears that in many locations, the location of the 100 -year
flood elevation may change significantly if the stream is realigned as shown on the plans.
On plan sheets 9 and 11, a temporary stream crossing is depicted. Please clarify if these tributary streams shall
permanently cross the sanitary sewer after construction is completed, and if so, please revise such that these
sections of sewer are constructed of DIP as the provided VAR 10-2013 form for variance requests to the 15A
NCACO2B rules indicates that ductile iron shall be used for all stream crossings.
6. On plan sheet 14, the distance between MH -28 and MH -29 appears to be greater than 425 linear feet (measured
at approximately 465 linear feet). Per 15A NCAC 02T.0305(i)(2), please provide documentation from Charlotte
Water indicating that they have the capability to provide routine cleaning and maintenance on the sewer at the
specified manhole separation.
If you have any questions, please let me know. Thanks!
Christyn L. Fertenbaugh, P.E.
Environmental Engineer
PERCS Unit
Division of Water Resources
Department of Environmental Quality
919-807-6312 — Office
919-807-6489 — Fax
[e-mail]
Mailing: 1617 Mail Service Center
Raleigh, NC 27699-1617
Physical: 512 N. Salisbury Street, Rm. 925S
Raleigh, NC 27604-1170
hil.
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