20210371 Ver 2_SAW-2021-00801 - Jake May Drive - Fairview Crossing - Response to USACE Comments - 1-26-2023_20230414

11
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E N G 1 N E E R I N G G R 0 U P
1 /25/2023
Christopher D. Hopper
Regulatory Specialist
U.S. Army Corps of Engineers
Regulatory Division
3331 Heritage Trade Drive, Suite 105
Wake Forest, NC 27587
RE: SAW-2021-00385 — Responses to Comments
Dear Christopher,
STRONGROCK ENGINEERING GROUP, PLLC
8362 Six Forks Rd. Suite 104
Raleigh, NC 27615
Company License # P-2166
In response to review comments provided on 01/16/2022, 1 am providing the following comment
responses:
1) Culverts appear to be proposed at stream grade. Please provide additional detail to ensure
compliance with general condition 2 (Aquatic Live Movements), and regional conditions 8
(Riprap) and 9 (culvert placement).
- SREG: Condition 2, 8, and 9 are met by placing culverts below grade in the stream/wetland
channel to allow positive connection to existing stream or wetland areas. Keeping the
existing wildlife path in the same channel with rip rap pads provided as energy dissipaters to
keep flow conditions the same post construction.
2) Impact exhibits would be part of any verification issued for this project. We appreciate the
difficulty of depicting multiple impact types on a single exhibit. However, the impact exhibits
are too busy to facilitate our review. Please provide exhibits specific to what our permit would
authorize (stream/wetland/open water impacts). Call each impact area out, numbering or
labeling each, with an area of impact requested please.
a. Exhibit A: What would become of the wetland between the second Fairway Crossing
Drive crossing and SCM#1? This area doesn't appear to be called out as an impact,
although trails and stormwater infrastructure appears to be shown.
- SREG: There will be no proposed wetland impacts in that area.
b. The boardwalk (?) stream crossing is shown, but would a second stream crossing along
the greenway be installed north of SCM #1?
- SREG: A proposed Timber boardwalk has been added to allow for hydraulic
connectivity.

LLC
STRON STRONGROCK 8E3 2 S xEForrks Rd. OSuite P104
Raleigh, NC 27615
E N G 1 N E E R i N G G R o u P Company License # P-2166
c. All: Match lines don't appear to match. Areas of impact are depicted, and this gives the
impression some areas aren't included in the overall tally.
- SREG: The plan set has been updated to correct match lines and the discrepancies.
d. A silt fence/limits of disturbance impact is shown across the stream between the pond
and Jake May Drive. However, no impact is listed in the table.
- SREG: The silt fence / limits of disturbance has been adjusted to not include those
areas. The construction along Jake May Road will be done at a later date under a
different permit, outside of the entrance work. Previously depicted road widening
efforts will be potentially completed in the future by the Municipality.
e. What is the peppered fill corridor shown inside the silt fence? There is no legend entry
with this pattern. Would a sidewalk, trail, or other disturbance be installed?
- SREG: This is concrete sidewalk, with concrete hatching being displayed.
f. Exhibit C: Please elaborate on the need for fill -slopes extending to the normal pool of
the existing pond for a mulch trail, and what measures are proposed to ensure no
inadvertent discharge results. Was a retaining wall, boardwalk, or other minimization
effort considered?
- SREG: A boardwalk and retaining wall was considered to help eliminate some of the
impacts due to the roadway or greenway trail. A retaining wall is not being used due
to the Buffer Zones.
g. Exhibit D: Was a retaining wall or other measure considered to minimize impacts to the
wetland? If stormwater is being collected and discharged below most of this wetland,
how would hydration of this feature be maintained?
- SREG: Other measures were considered, however due to its location a retaining wall
or a different option will still cause impacts. Previous iterations of the site plan have
impacted this wetland in multiple areas. With rounds of design changes with
steepened slops and retaining walls. Efforts were made to eliminate the majority of
the proposed impacts here.
h. Exhibit E: Match lines are confusing. Impacts are shown here but none are listed in the
impact table. A playground is reported as roadway impact?
- SREG: Based on the 4 categories we used between roadway, greenway, SCM, and lot
we chose to classify as roadway.

LLC
STRON STRONGROCK 8E3 2 S xEForrks Rd. OSuite P104
Raleigh, NC 27615
E N G 1 N E E R i N G G R o u P Company License # P-2166
i. Exhibit F: Headwalls are shown on the profile sheet, but don't appear to have limited
the area of stream or wetland impacted. Have steeper slopes or higher headwalls been
considered here?
- SREG: Steeper slopes were considered, however were deemed unmaintainable pass
3:1 slope.
j. What is being shown between 0+00 and 1+89 along the stream centerline?
- SREG: The culvert profile is being shown along the stream centerline between those
stations.
k. There is a significant meander in the stream just upstream of the culvert invert. It
appears the potential for bank scour will be significant. What measures are proposed to
minimize this concern?
- SREG: Rip Rap Dissipater Pads are being proposed to slow down the velocity to
prevent potential head cutting along the channel.
I. Please provide details of the diversion ditch to be constructed. How would turbidity be
minimized? How long would this be in place?
- SREG: The diversion ditch will not be needed, as we will install a temporary coffer
dam with the same pump concept to dewater and install the culvert within 7 days.
m. Exhibit G: There is a significant impact to Wetland WA in this location. Would a more
perpendicular crossing, or eastern alignment of Saucon Street minimize these impacts?
- SREG: A different alignment was reviewed, however impacts will still occur due to
slopes of the roadway as well as site infrastructure. Due to roadway geometry and
the orientation of the wetland, crossings or alignment changes still occur to almost
same value of impact.
n. It appears the isolated portion of this wetland would be redirected to another drainage
via culvert? Please provide additional detail of this impact, along with its purpose and
need. These connections are rarely successful; the isolated portion of this wetland may
be considered a loss in any permitting, provided purpose, need, avoidance, and
minimization can be demonstrated.
3

LLC
STRON STRONGROCK 8E3 2 S xEForrks Rd. OSuite P104
Raleigh, NC 27615
E N G 1 N E E R i N G G R o u P Company License # P-2166
- SREG: We have taken most of the nutrient loaded runoff and captured it in our
stormwater drainage network to be taken care of in our SCM for treatment. There is
still surface runoff from the lots that will feed the wetland area.
o. Exhibit H: Wetland connections provided via culvert can lead to head -cutting and
eventual drainage of upslope resources. Please consider measures to ensure
connectivity is provided without allowing for head -cutting. Similar projects elsewhere
have proposed at -grade concrete sills at inverts, riprap pads both up- and down -slope of
the culvert.
- SREG: A 6 inch concrete sill will be provided on the upstream end of the culvert to
slow down velocity and to create a weir to maintain water in the wetland. A rip rap
dissipater pad is proposed for the downstream end to allow control of the flow of
water.
Please let me know if you have any further questions.
Take care,
Christopher Stone
Civil Engineer II
Strong Rock Engineering Group, PLLC

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