20140957 Ver 2_JAB Add Info2 rewrites_20170914

1. The project involves numerous stream crossings that have a potential to affect
downstream water quality both temporarily during construction and permanently if
these impacts are not avoided or minimized to maximum extent practicable. Your
application and responses to the Division provide thorough general descriptions of the
plans for the project. However, more site-specific detail is necessary to ensure that
downstream water quality is protected. Provide the additional justification requested
below:
a. Add a column to the Wetland and Waterbody Crossing table (Appendix C-1) for
each waterbody more than 30 feet in width that provides site specific reasons
why each crossing could not be completed using the HDD method or a
conventional bore to avoid impacts to the stream channel.
b. Many crossings are proposed to be installed using the open cut method that do
not make accommodations for the work to be completed in the dry or without
exposure to flowing water. This type of crossing has the potential to introduce
sediment into the stream channel that can cause degradation of downstream
water quality with lasting effects. Provide the additional justification requested
below:
Provide a site-specific justification and crossing plan for all open cut
crossings proposed. These plans should include turbidity curtain
locations, and upstream/downstream water quality sampling locations
for turbidity and total dissolved solids (sampling for total dissolved solids
is only required within Water Supply Watershed areas).
ii. Your July 12, 2017 response to the Division indicated that the open cut
method was proposed for several crossings due to the presence of
inundated wetlands. Many of these wetlands do not appear to be
inundated based on aerial photography and identification of a discrete
channel by the field survey. Provide documentation that the adjacent
wetlands are inundated beyond the discrete channel for each of these
crossings.
iii. Your July 12, 2017 response to the Division also stated that utilizing a dry
method for several stream crossings would result in more impact for a
longer duration. Provide an explanation of the additional impact and
duration of the impact compared to using a dry method, including site-
specific plans showing the additional impact.
iv. Both dam and pump and the flume method are listed for many stream
crossings, provide the criteria for selecting one method over the other,
including who will make the decision and when the decision will be made.
v. The typical diagrams for each stream crossing method indicate that a
temporary bridge will be installed if needed. Provide the criteria to
determine if a temporary bridge will be needed.

1. If a temporary bridge isn't needed, explain how equipment will
operate without crossing back and forth within the stream
channel.
c. Provide a restoration plan for all stream crossings. This can be accomplished by
assigning a typical restoration plan for each different restoration plan that may
involve restoration of preconstruction contours, laying back banks on incised
streams or placement of riprap to ensure streambank stability where the
conditions at the crossing warrant this protection.
2. Provide a plan to monitor all stream restoration through two growing seasons once
vegetation is established. The plan must include visual monitoring at a minimum of
quarterly for the first year or two bankfull events (whichever is longer), and then
annually until the site is stable (particularly after storm events) and vegetation is
successful. The plan must also include a requirement to provide annual reports to the
Division including any failures of structures, stream banks, or vegetation that may
require future repairs or replacement and coordination with the Division to ensure the
stability and water quality of the stream and downstream waters. [15A NCAC 02H
.0506(b)(2) and (b)(3)]
3. Provide a plan to monitor all wetland restoration through two growing seasons once
vegetation is established. The plan must include visual monitoring at a minimum of
quarterly for the first year, and then annually until the site is stable and vegetation is
successful. The plan must include provisions to