20231724 Ver 1_More Info Received_20240214

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Technical Memorandum
To: Jessi Baker, Environmental Planning Program Manager
From: Thomas L. Fitzgerald, PE, RQC Project Civil Engineer
cc: Justin Cazeault, Project Construction Manager
Bernhard Boesch, AIA, LEED AP BD+C, Senior Design Project Manager
Date: 2/8/2024
Re: P1458 - Stream Crossing, Culvert Installation and Road Section Wetland Permitting
Pursuant to our discussions, e-mail correspondence and review inquiries to date here is a summary of our responses
and updated information is attached to address regulatory review comments:
1. DWR requested copies of project grading sheets CG108 and CG111 (or the areas shown within) to be included in
your revised drawing set for the PCN.
R1: See attached, current copies of grading sheets attached.
2. USACE regulator will need some permit specific drawings that show the stream cross-section and the invert of the
culvert and the temporary vs permanent impacts.
R2: See attached updated plan sheets showing temporary and permanent phases of construction, stream cross
sections, permanent culvert sections and inverts and current copies of grading sheets.
3. There is rip rap proposed on both the inlet and outlet end which is not typical on a coastal stream that has a 1 %
slope. Please further explain why rip rap would be justified on both ends.
R3: We are required to have inlet and outlet stabilization per NCDENR ESC rules even though the stream energy is
relatively low we expect this will be required to stabilize the culvert connection to the existing stream channel. We
will be installing this riprap in cross section to match the existing natural stream channel so there are no changes to
grade or geometry (i.e. riprap is placed in same configuration and elevation as natural channel to replicate
preconstruction conditions). Riprap sections shown in plan and profiles on attached drawings.
4. Rip rap is considered a permanent impact, but it may not be a permanent loss if the rip rap is set at the same
elevation of the stream bed. Its difficult to tell from these drawings whether that is the case. The preference
regarding minimization would be for the rip rap to be set at the stream bed elevation. Please clarify through
drawings the intentions here with justification.
R4: We will be installing this riprap in cross section to match the existing natural stream channel so there are no
changes to grade or geometry (i.e. riprap is placed in same configuration as natural channel to replicate
preconstruction conditions); therefore is not included in permanent impacts. Rip rap is required for construction to
provide immediate, non -erodible stabilization at culvert flared end sections as part of construction practices to
minimize diversion transition erosion potential to provide long-term inlet/outlet stabilization per NC ESC rules.
Riprap sections shown in plan and profiles on attached drawings.
5. Please clarify what impact is permanent and temporary as the PCN makes no note of temporary impact associated
with the stream but the drawings contradict.
R5: We have clarified our outline of temporary and permanent impacts on attached revised plan sheets; relocating the
permanent culvert into the existing stream channel enables us to reduce impacts considerably.
Considering inlet and outlet riprap is installed to match preconstruction contours and geometry of the total
permanent perennial stream impacts are limited to 95 linear feet; temporary impacts to the stream are limited to
115' during construction (as measured along the centerline or thalweg within extents of permit area). Total wetland
impacts are limited to 7,695 square feet; these are now exclusively permanent, there are no temporary impact
areas; we have resolved to execute work within this footprint to include all grading and site work in order to
minimize impacts to the maximum extent practical. This will require several phases of work for the temp. stream
crossing; diversion ditch and temp. stream crossing; and final phase for the permanent culvert installation. We
Page 1 of 3 Section 401/404 Comment Response 2-8-24

P1458
have consulted with our culvert installation contractor and he agrees that they can execute required work in this
manner in order to limit potential impacts.
6. A portion of Regional conditions 9 is below: c. Culverts shall be designed and installed in such a manner that the
original stream profiles are not altered and allow for aquatic life movement during low flows. The dimension,
pattern, and profile of the stream above and below a pipe or culvert shall not be modified by widening the stream
channel or by reducing the depth of the stream in connection with the construction activity. The width, height, and
gradient of a proposed culvert shall be such as to pass the average historical low flow and spring flow without
adversely altering flow velocity. If the width of the culvert is wider than the stream channel, the culvert shall include
multiple boxes/pi pes, baffles, benches and/or sills to maintain the natural width of the stream channel. If multiple
culverts/pipes/barrels are used, low flows shall be accommodated in one culvert/pipe and additional culverts/pipes
shall be installed such that they receive only flows above bankfull.
R6: Attached figure documents design and installation configuration of the culvert replicates existing stream profile;
concrete invert elevation of culvert is designed 6" below stream profile and 6" rock weirs (sills) are grouted into the
culvert to stabilize the natural bottom that will be established within the culvert to allow aquatic life movement in a
natural manner during low flow periods consistent with Regional Condition 9.
We are not widening or increasing the depth of the existing stream channel upstream or downstream of the culvert;
we are tying the stream channel in after the culvert is installed to match the existing stream channel cross-section,
profile, depth and width.
The width, height and gradient of the culvert matches the stream channel capacities and flows will not be altered
with the installation of the culvert. There is no historical flow data available for this channel as it is a minor un-
named tributary with limited contributory area and has not be gauged previously. Bank full flow is accommodated
within the new culvert which matches the average width of the existing channel.
7. Please explain how you the proposed culvert will maintain the pattern of the stream when it appears there are
channel changes coming into and out of the culvert inlets and outlets. Can the pipe be extended and realigned in
order to maintain the pattern of the stream through the project? If it can not then justification will be necessary as a
waiver from this regional condition will be necessary.
R7: We have revised design to install the new permanent culvert directly within the existing stream channel alignment
whereas it can directly tie-in to the existing stream channel at the inlet and outlets. This requires as temp. diversion
channel to be constructed with temp. stream channel crossings provided during construction but enables us to
avoid and minimize permanent impacts to the maximum extent practicable.
8. The permanent pipe run is 88' but permanent impact totals 140', why? In the spirit of minimization, the stream
impacts should not extend much beyond the permanent pipe length, please explain further or clarify?
R8: Apologies if the presentation of the impacts was confusing on initial submittal. Based on design review input to
date we have refined the design to further minimize permanent impacts to 7,695 SIFT of wetland and 95 linear feet
of stream channel. Temporary impacts to the stream channel during construction have also been minimized to 115
linear feet.
Page 2 of 3 Section 401/404 Comment Response 2-8-24

P1458
Review of A+ Application Presentation reference provided by the USACE (as applicable):
R1: Project submittal plan views show all relative features noted on "Plan" presentation slide:
a. Project boundaries
b. Entire Site Plan
c. All waters and wetlands marked
d. All jurisdictional areas that will be impacted.
1. Dredged (not applicable)
2. Filled (Road Section)
3. Structures in Section 10 waters (not applicable)
R2: Project profile and cross section plans show all relative features noted to be presented as called out on "Cross
Section" presentation slide:
a. Existing Stream bed and banks
b. Proposed Culvert (dimensions noted)
c. Ordinary High Water Mark (coincident with right and left top of bank condition as noted)
d. Existing stream width
e. Depth that culvert will be buried
f. Slope of the natural channel
R3: Project profile of stream impact shows relative permanent culvert profile; normal surface water level elevation and
channel profile and grade per "Profile of Stream Impact" presentation slide.
R4: Temp coffer dam is shown in plan and profile view to document elevation in relation to existing stream channel,
temp diversion and permanent culvert installation.
R5: Per "Avoidance and Minimization" slide the following are confirmed:
1. No stream crossings at angles over 105-degrees or less than 75-degrees
2. No stream crossings cross two streams above or at the confluence of those streams.
3. No multiple stream crossings on this project.
4. Property access and site layout precoordinated and dictated by design -build contract and prior NEPA analysis.
No other stream crossing points are viable; point of crossing is narrowest section of regional wetland setting.
5. Road, building and site layout have been integrated to provide 50' buffer to wetland areas to maxium extent
practical. Impacts have been minimized to road crossing section.
6. Site cannot be reconfigured as operational space requirements are integrated with U.S.M.C. requirements.
7. Sideslopes have been maximized to 3:1 (H:V) so they can be stabilized with turf. Culvert inlet and outlet
headwalls include steeper slopes (2:1) to minimize stream impacts.
8. We are using headwalls to limit required length of culvert at entrance and exit.
9. Retaining walls are not viable given site constraints
10. Culd-de-sac is not feasible given access requirements
11.No subdivision of lots or alternate access is permissible; area roadways are four lane, limited access
thoroughfares and therefore direct driveway entrances are not permitted by local authorities.
Page 3 of 3 Section 401/404 Comment Response 2-8-24

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PLAN
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� I INSTALLED AND ANCHORED IN
SF SF SF SF SIF SF SF SF SF � I / 5
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p � TEMP. INV.
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DIVERSION IS COMPLETED. / o00 7.00
0 — - — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — - — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
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PLAN
NORTH
i
5
GENERAL NOTES
1. CONSTRUCT EROSION AND SEDIMENT CONTROL MEASURE IN
ACCORDANCE WITH NCDEQ EROSION AND SEDIMENT CONTROL
PLANNING AND DESIGN MANUAL.
2. E&S MEASURES SHOWN ARE PERFORMANCE BASED, CONTRACTOR
MUST PROVIDE ADDITIONAL CONTROLS AS NECESSARY TO CONTROL
OFF -SITE SEDIMENT MIGRATION, INCLUDING USE OF DUST CONTROL
AND SUPPLEMENTAL BEST MANAGEMENT PRACTICES. CONSULT
ENGINEER OF RECORD FOR SIZING OF ADDITIONAL CONTROLS OR
MODIFICATIONS TO THIS PLAN.
3. INSPECT E&S CONTROL FEATURE WEEKLY (EVERY 5 WORK DAYS)
AND AFTER SIGNIFICANT (1/2" OR GREATER) RAINFALL EVENTS TO
MAINTAIN PERFORMANCE OF CONTROLS. IMMEDIATELY MAKE ALL
NEEDED REPAIRS TO MAINTAIN ESC FUNCTION.
4. TEMPORARY STABILIZE EXPOSED SOIL AREAS THAT WILL NOT BE
BROUGHT TO FINAL GRADE FOR A PERIODS OF MORE THAN 21
CALENDAR DAYS
5. PLANT/SEED PERMANENT VEGETATION WITHIN 15 WORKING DAYS OF
COMPLETING EACH PHASE OF PERMANENT GRADING OR WITHIN 90
CALENDAR DAYS AFTER FINAL GRADE IS REACHED, PROVIDE
TEMPORARY STABILIZATION AT ALL TIMES UNTIL PERMANENT
STABILIZATION IS ACHIEVED ON SITE. MAINTAIN PERIMETER
CONTROLS UNTIL SITE IS PERMANENTLY STABILIZED.
6. ENSURE THAT SURFACES ARE NON -EROSIVE AND STABLE WITHIN 15
WORKING DAYS OR 90 CALENDAR DAYS AFTER COMPLETION OF THE
ACTIVITY, WHICHEVER PERIOD IS SHORTER IN ACCORDANCE WITH
NORTH CAROLINA REQUIREMENTS.
7. PROJECT LIMITS AND LIMITS OF DISTURBANCE ARE SHOWN AS
OFFSET FOR CLARITY. CONFIRM ACTUAL PROJECT LIMITS AND LIMITS
OF DISTURBANCE WITH THE DESIGNER OF RECORD.
8. PROVIDE SAME DAY STABILIZATION FOR ALL DISTURBED AREAS
DOWNSTREAM OF DISCHARGE POINTS.
I O SHEET KEY NOTES I
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PLANNING AND DESIGN MANUAL.
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2. E&S MEASURES SHOWN ARE PERFORMANCE BASED, CONTRACTOR
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OFF -SITE SEDIMENT MIGRATION, INCLUDING USE OF DUST CONTROL
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MAINTAIN PERFORMANCE OF CONTROLS. IMMEDIATELY MAKE ALL
INSTALL COFFER DAM AND DIVERSION
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NEEDED REPAIRS TO MAINTAIN ESC FUNCTION.
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4. TEMPORARY STABILIZE EXPOSED SOIL AREAS THAT WILL NOT BE
BROUGHT TO FINAL GRADE FOR A PERIODS OF MORE THAN 21
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n
36" /I 11 ` �'
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��
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" FENCE TO MOUNT LINER 30 HIGH ON /�WORKING
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6. ENSURE THAT SURFACES ARE NON -EROSIVE AND STABLE WITHIN 15
DAYS OR CALENDAR DAYS AFTER COMPLETION OF THE
� LOD � EACH SIDE
LODw1j„
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NA
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S� 0 �
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9. APPLY TEMPORARY SEEDING AND MULCH COVER PER NC STANDARD
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SSF $ �� INSTALLATION OF PERM. CULVERT. �'
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— — — — — — — — — — — — — — — — — — — — — — — — i
14' WIDE / / o ° TOP S. SILT
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— — — — —
— — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — �— — — — —ssF — — —yy — — — — — — — — — — — — — — — — — — — — — — — — — —
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30 MIL POLYETHYLENE LINER
MOUNT TO ON EACH SIDE OF
DESIGN
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1620 Faraday Avenue
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ti 4 #00 0 o ti � EROSION CONTROL
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CONSTR. CONTR. NO.
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NORTH
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PLANNING AND DESIGN MANUAL.
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2. E&S MEASURES SHOWN ARE PERFORMANCE BASED, CONTRACTOR
MUST PROVIDE ADDITIONAL CONTROLS AS NECESSARY TO CONTROL
OFF SEDIMENT MIGRATION, INCLUDING USE OF DUST CONTROL
I BOUNDARY o
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AND SUPPLEMENTAL BEST MANAGEMENT PRACTICES. CONSULT
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ENGINEER OF RECORD FOR SIZING OF ADDITIONAL CONTROLS OR
MODIFICATIONS TO THIS PLAN.
�- c� _ 0 o 0 �" CLASS 1A RIPRAP COFFER DAM / I I
BOX CULVERT TOP EL. 8.50' I
3. INSPECT E&S CONTROL FEATURE WEEKLY (EVERY 5 WORK DAYS)
AND AFTER SIGNIFICANT (1/2" OR GREATER) RAINFALL EVENTS TO
11
MAINTAIN PERFORMANCE OF CONTROLS. IMMEDIATELY MAKE ALL
12" WIDE X 'HIGH o
INSTALL COFFER DAM AND DIVERSION / ' o
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NEEDED REPAIRS TO MAINTAIN ESC FUNCTION.
GROUTED "STONE I FENCE BARRIER TO DIVERT FLOW
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BROUGHT TO FINAL GRADE FOR A PERIODS OF MORE THAN 21
WEIR 22' C.
W.S.E. @ - -- I I I INTO COMPLETED DIVERSION �/ I I �`'
— — — - EL.-5,25' - CHANNEL.
CALENDAR DAYS
5. PLANT/SEED PERMANENT VEGETATION WITHIN 15 WORKING DAYS OF
o
— (OHW) — ------ ---- — 4
---- I `' �'
1 ��\ TEMP. INV. / ,�/ /
/
COMPLETING EACH PHASE OF PERMANENT GRADING OR WITHIN 90
CALENDAR DAYS AFTER FINAL GRADE IS REACHED, PROVIDE
TEMPORARY STABILIZATION AT ALL TIMES UNTIL PERMANENT
o
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EL. 5.30'
STABILIZATION IS ACHIEVED ON SITE. MAINTAIN PERIMETER
m
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6. ENSURE THAT SURFACES ARE NON -EROSIVE AND STABLE WITHIN 15
WORKING DAYS OR 90 CALENDAR DAYS AFTER COMPLETION OF THE
ACTIVITY, WHICHEVER PERIOD IS SHORTER IN ACCORDANCE WITH
"� I I',� i i I � i ' � ' � i i i � � �'
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SSF SSF SSF_ LOD , �� ERMI NOpR� LODD �����
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7. PROJECT LIMITS AND LIMITS OF DISTURBANCE ARE SHOWN AS
OFFSET FOR CLARITY. CONFIRM ACTUAL PROJECT LIMITS AND LIMITS
OF DISTURBANCE WITH THE DESIGNER OF RECORD.
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0 O�o Oo� ss� SF sF — SF
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8. PROVIDE SAME DAY STABILIZATION FOR ALL DISTURBED AREAS
DOWNSTREAM OF DISCHARGE POINTS.
9. APPLY TEMPORARY SEEDING AND MULCH COVER PER NC STANDARD
4 WIDE, 2 DEEP WITH 1:1 SIDESLOPES (SLOPE
°° o �� / 0.5°/O . LINE CHANNEL WITH 30 MIL POLYETHYLENE
- O
PRACTICE 6.14 TO STABILIZE ALL SLOPES AND GRASS CHANNELS
UNTIL SOD IS PLACED. MAINTAIN MULCH COVER UNTIL FINAL SOD
COVER IS PLACED. ANCHOR MULCH WITH DEGRADABLE EROSION
III�III�III�III�III�III�"hlI�III�III�III�III�"'�I�����'
O ° ° ° LINER STAKED INTO PLACE USE SUPER SILT
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TEMP. INV.
REMAIN EXPOSED FOR MORE THAN 14 DAYS. SELECT AND TACK
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CONSTR. CONTR. NO.
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PLAN
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NORTH
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p 24 48
v
NAVFAC DRAWING NO.
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Al
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SHEET OF
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P1458 PCN 401/404 2-9-24
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EPROJECT NO.: 1397586
Feet CONSTR. CONTR. NO.
N40085-20-D-0034
20 NAVFAC DRAWING NO.
12897325
SHEET OF
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DRAWFORM REVISION: 25 AUGUST 2020
P1458 PCN 401/404 2-9-24

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