20180488 Ver 1_More Info Received_20180508

CAROLINA
ECOSYSTEMS, INC.
MEMORANDUM
DATE: May 8, 2018
FROM: Chris Hopper, Carolina Ecosystems, Inc.
3040 NC Hwy 42 West; Clayton, NC 27520
P:919-274-5979 — F:919-585-5570
TO: Ms. Sue Homewood, NC Department of Environmental Quality
RE: Pre -Construction Notification Package Questions
East Davie County and Idols Road Sewers Construction Corridors
Davie and Forsyth Counties, NC
Thank you for your comments on the above referenced PCN Application, dated April 23, 2018.
Below are your comments with the team's response to each.
Comment 1: For Smith Creek and Stream SM, can you please confirm that the engineer/client
are certain that a complete pump around of these larger channels is feasible, even if a storm
event occurs during construction?
Response: The construction documents will be revised to instruct the contractor to perform the
stream crossing when the stream is at low flow and when there is not rain called for in the
weather forecast for that day. The crossings should each be completed in a single day, thereby
reducing the risk of encountering a surprise rain event.
Comment 2a: It appears that the crossing of stream SH occurs where there is a meander in the
channel and that the meander will be within the permanent maintained corridor very close to the
sewer line. I have some of the same concerns with this potential scenario as I would with an
area where construction may be occurring within 10' of a stream bank, that the channel may not
remain stable when the trench construction is so close even with riprap installation after
construction.
Response: The location of the subject stream crossing is located in a heavily wooded,
undeveloped area that is near the top of the drainage basin and thus the drainage area is relatively
small. A full-time inspector will be present to ensure that the trenching and backfill operations
are done according to the specifications. The streambank restoration will introduce some
additional stability to the stream bank for the future. In addition, based on the direction of flow
the stream will meander away from the pipe installation.
Comment 2b: Can you provide me with a little more information about the stream that may help
me determine the level of my concern please. You list it as a perennial stream but does it show
indication of being unstable or subject to very flashy storm events/flows?

Mr. Randy McNeal, P.E. Page 2 of 2
August 11. 2017
Response: The stream (photo below) does not appear to be unstable or subject to flashy flows. It
is a two- to three-foot wide perennial stream with a healthy meander to entrenchment ratio. Its
source is partially controlled by ponds upslope on the Tanglewood Golf Course property, and
very little development exists in its watershed. No stormwater improvements or discharges were
observed during reconnaissance.
The photo below was taken from the crossing location on the meander of concern, looking
downstream. The photo date was February 2, 2016 (wet season). Ample roots and instream
structure exist to retain this feature's integrity after construction is complete.
Comment 3: There is a note on the plans to the owner that the maintained easement should only
be 15' wide in wetland areas. In accordance with GC4133 can you please modify the note to
state "in wetland areas and at stream crossings ".
Response: The requested change has been made to all construction drawings with stream and
wetland resources depicted.