20200248 Ver 1_Revised PCN - USACE Comments_20200421

Sylvester Development, Richlands, Onslow Co., NC (USACE NCDWR-2020-0248)
REVISED PCN Sections CA, 2 & 3 and Section D.1.
C. Proposed Impacts Inventory
1. Impacts Summary
1 a. Which sections were completed below for your project (check all that apply):
❑ Wetlands ® Streams — tributaries ❑ Buffers ❑ Open Waters ❑ Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted.
2a.
2b.
2c.
2d.
2e.
2f.
Wetland impact
Type of jurisdiction
number —
Type of impact
Type of wetland
Forested
Corps (404, 10) or
Area of impact
Permanent (P) or
DWQ (401, other)
(acres)
Temporary T
W1 — "Ditch 3"
Service Road
Non-NCWAM Type
❑ Yes
® Corps
0.005
® P ❑ T
'Jurisdictional Ditch"
® No
® DWQ
2g. Total wetland impacts
0.005
2h. Comments:
Note: Impact W1 — Ditch 3 is to a jurisdictional ditch, not natural or modified wetlands. The ditch area was accounted for as
"wetlands" per guidance from the USACE and to be consistent with the ditches were accounted for in past DOT road
improvement project(s).
3. Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete this
question for all stream sites impacted.
3a.
3b.
3c.
3d.
3e.
3f.
3g.
Stream impact
Type of impact
Stream name
Perennial
Type of jurisdiction
Average
Impact
number
(PER) or
(Corps - 404, 10
stream
length
Permanent (P) or
intermitte
DWQ — non-404,
width
(linear
Temporary (T)
nt (INT)?
other)
(feet)
feet)
S1 ® P ❑ T
Entrance Road
"Ditch 1"
❑ PER
® Corps
6
133
UT to New River
® INT
® DWQ
S2 ® P ❑ T
Lot Fill &
"Ditch 2"
❑ PER
® Corps
6
668
Service Road
UT to New River
® INT
® DWQ
S4 ® P ❑ T
Service Road
"Ditch 4"
❑ PER
® Corps
3.7
93
UT to New River
® INT
® DWQ
3h. Total stream and tributary impacts
871
3i. Comments:
Note: Ditch impacts 1, 2 & 4 were determined by the N.C. DWR on April 8, 2020 to be a modified, intermittent stream and not
simply a jurisdictional ditch.
CAPITO.RACHEL. CAPITO.RACH ELANN.153627679
ANN.1536276790-,_.2020.04.2014A726-04'00

Sylvester Development, Richlands, Onslow Co., NC (USACE NCDWR-2020-0248)
REVISED PCN Sections C.1, 2 & 3 and Section D.1.
D. Impact Justification and Mitigation
1. Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
The developer hired S&EC, PA early on to delineate all potentially jurisdictional WOTUS within the project area. S&EC, PA
delineated a naturally occurring potentially jurisdictional wetland within the wooded area just to the west of the project area.
The project engineer then designed the project to avoid this wetland area. However, agricultural ditches were found to exist
within the project area that S&EC confirmed with the USACE were jurisdictional based on past determinations made on
sections of the ditches for a DOT road improvement project along Hwy24. The project engineer could not avoid impacts to
these jurisdictional ditches, but was able to incorporate a dedicated bypass pipe to act as a hydrologic connection between
the wetlands to the west of the project area and downstream WOTUS.
***Additional information provided in the attached "Ditch Impact Justification" letter from the project engineer. ***
1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
The project will obtain a land disturbance permit from DEMLR and post -construction stormwater management plan approved
by DEQ that includes the "Proposed Stormwater Impoundment" shown on Lot 11 of the development. The BMPs included
within these State approved plans will help to protect downstream waters.

Engineering • Planning Site Design
April 14, 2020
Sylvester Development
NC Hwy 24
Richlands, NC
Ditch Impact Justification
Sylvester Farms Development is proposed on an assemblage of properties comprised of cultivated fields
with.a few areas of wetlands and ditches. Some of these ditches have been determined by DWR to be
jurisdictional ditches. In the design of the project, considerable efforts were expended to minimize the
impacts to these features while still accommodating the intended development of the property —including
the creation of outparcels abutting NC-24. The topography is quite flat and the ditches (some of which
have now been classified as jurisdictional ditches traversing the cleared fields were originally created to
facilitate surface drainage of these cultivated fields. The invert elevations of some of the ditches are
actually lower than the surface elevation of the wetlands area.
The location/routing of streets to serve the proposed development is governed by a number of factors in
addition to the location of the wetlands and the existing ditches. Driveway/street connections on NC Hwy
24 to serve the development have been dictated by NCDOT traffic review comments and
recommendations. Market considerations specify the area and depth of the proposed outparcels thereby
dictating to a considerable extent the location of proposed Street 1 which will connect from Koontz Fork
Road to Sylvester Drive.
The routing of Street 1 was set so as to minimize impact upon the existing area of wooded jurisdictional
wetlands. A parallel piping system dedicated to the outflow from the existing wetlands area was designed
to provide hydraulic connectivity between the wetland area and the downstream receiving course, and to
ensure segregation of the wetland outlet flow from the surface stormwater runoff from the proposed
development.
Impact 4 is merely a relocation of the existing channel to the perimeter of the proposed impact area.
Impacts 1 through 3 involve elimination of the impacted channels. None of these features are currently
contributory to the wetland area. The pattern of stormwater runoff from the proposed developed site will
maintain the existing pattern of segregation of stormwater flow --with the runoff that is contributory to the
existing wetland area being routed directly from the wetland area to the downstream water course; and the
runoff from areas that are not contributory to the wetland area being collected and routed to Stormwater
Control Measures within the development to protect water quality.
The design of the proposed development has incorporated measures to minimize impact to the existing
wetland area and to maintain, to the extent practicable, the overall existing stormwater flow patterns of
the site.
Sincerely
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WILLIAM G. DANIEL AND ASSOCIATES
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Bart J. Mc(gain, P.E.
Project Engineer`�`�'`°°�:"►`'�L��
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