20231448 Ver 1_2. NRCS-TSP Certification_20231023

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MEMORANDUM DICI<SON
community infrastructure consultants
720 Corporate Center Drive Raleigh, North Carolina 27607 919.782.0495 tel.
TO: Emily Thompson, PWS
Regulatory Specialist
U.S. Army Corps of Engineers
FROM: LIZ DINATALE, PE
TSP-20-23015
DATE: 10/09/23
RE: NWP-27
The Wayne Executive Jetport is drained through a network of stormwater culverts and multiple
ditches to an onsite stream, which drains from the western edge of the property and enters into
a tributary of Stoney Creek. Localized erosion occurs and there is evidence of potential failure in
some of the existing, aged, corrugated metal pipes (CMPs). Additionally, an onsite pond
serving as a potential waterfowl attractant and existing tree line poses safety risks. The purpose
of the project is to establish a durable and efficient stormwater drainage system and improve
the operational safety at the airport.
The proposed stormwater improvements include repairing and replacing degraded pipes,
regrading and potentially piping select ditches, and establishing grass and herbaceous
vegetation to stabilize the ditches. The proposed improvements also include unblocking Stoney
Creek at a farm crossing and establishing a stream alignment the is appropriate for the area.
Improvements also include removing the existing trees posing risks and establishing a
vegetation maintenance program to prevent the growth of future woody vegetation. At a
minimum, the ditch and culvert improvements will be designed to convey runoff from a 10-
year, 24-hour storm event.
The downstream pond along Stoney Creek is being established artificially by a farm crossing
pipe that is undersized and perched. A larger pipe is proposed to replace the undersized pipe
and the invert will be buried 1 ft to allow for organism transport. The pond will be regraded
with natural stream geometry to increase in -stream habitat and reduce the risk of waterfowl
intrusion.

The proposed restored reach will have a four -foot base channel width with 3-foot benches at the
ordinary high water mark elevation, see Figure 1.
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TYR. CROSS SECTION B
NOT TO SCALE
Figure 1 - Stream Typical Section
The benches and upper banks of the stream will be planted with low -growing riparian species
that create habitat while also providing stability for the stream banks without creating a hazard
for the airport.
After carefully considering the benefits this project has on the aquatic and riparian habitat by
restoring natural bedform diversity where habitat has been greatly diminished or eliminated, it
is my opinion, as a qualified Technical Service Provider for the NRCS, that the Wayne Jetport
improvements of Stoney Creek project qualify as an aquatic habitat enhancement to be
authorized under Nationwide Permit #27.