20201018 Ver 1_Holly Springs Road PHII - USACE Additional Information Package 2 - 20201221_20201221

kimley-horn.com 421 Fayetteville Street, Suite 600, Raleigh, NC 27601 919 677 2000
December 21, 2020
Mr. Lyle Phillips
U.S. Army Corps of Engineers
Raleigh Regulatory Field Office
3331 Heritage Trade Drive, Suite 105
Wake Forest, NC 27587
Mr. Rob Ridings
NC Division of Water Resources
Transportation Permitting Unit
512 N. Salisbury Street
Raleigh, NC 27604
RE:SAW-2020-00216 – Request for Additional Information Response
Holly Springs Road Widening – Phase 2
Holly Springs, Wake County, North Carolina
Dear Mr. Phillips and Mr. Ridings,
On behalf of our client, the Town of Holy Springs, Kimley-Horn is submitting the attached additional
information for the above referenced Project per the US Army Corps of Engineers (USACE) Request
for Additional Information received via email on December 3, 2020.
Below is an outline of the USACE comments with a brief narrative addressing each item. The
USACE comments with Kimley-Horn response and explanation are as follows:
1. The application submitted via email on August 5, 2020 states that Holly Springs Road
Widening – Phase 2 project is being locally funded through the Town of Holly Springs
transportation bond. The “Response to USACE Incomplete Application Notification” submitted
via email on November 13, 2020 states that federal funds have been acquired for the
proposed project.
a. Are federal funds being used for the Holly Springs Road Widening – Phase 2
project?
The project received the LAPP funds through CAMPO in spring 2020, therefore
federal funds are being used for the project.
b. Is the Federal Highways Administration the lead federal agency?
The FHWA will be the lead federal agency for this project.
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kimley-horn.com 421 Fayetteville Street, Suite 600, Raleigh, NC 27601 919 677 2000
2. The “Response to USACE Incomplete Application Notification” submitted via email on
November 13, 2020 states that a Categorical Exclusion (CE) was prepared to document
environmental conditions and effects that would result from the Project.
a. Please provide a copy of the CE.
Kimley-Horn representatives and Tim Athy have signed the CE and submitted to NCDOT
for review and signature. However, as of the date of this letter, NCDOT has provided
additional comments to Kimley-Horn for incorporation into the final CE. Following
revisions per the NCDOT comments, the CE will be submitted to FHWA for review as
well. We anticipate receiving the final approved CE in early January and will provide the
CE documentation to the USACE at that time.
3. The “Response to USACE Incomplete Application Notification” submitted via email on
November 13, 2020 states that it is expected that unsuitable material is present beneath the
existing box culvert. Once removed, a ‘hole’ within the stream is to be expected in the
footprint of the removed culvert. Kimley-Horn proposes to raise the stream bed with suitable
material to match existing stream contours outside the existing culvert footprint. Then, build a
constructed riffle in the footprint of the existing culvert to prevent culvert. Once removed, a
‘hole’ within the stream is to be expected in the footprint of the removed culvert. Kimley-Horn
proposes to raise the stream bed with suitable material to match existing stream contours
outside the existing culvert footprint. Then, build a constructed riffle in the footprint of the
existing culvert to prevent headcutting, erosion, and scouring long term post-construction.
The constructed riffle would provide a better, more stable aquatic habitat below the proposed
bridge, and would fill the void left from the culvert removal. The details of the constructed riffle
are included with this submittal.
a. Please provide a description of the construction of the proposed riffle.
i. Will dewatering be required to install the constructed riffle?
The riffle will be built in the dry within the footprint of the removed culvert
following the same ‘half and half’ approach. The plan sheets note that
dewatering behind the impervious dike may be necessary but no additional
dewatering of Middle Creek will be required to facilitate construction of the
riffle.
ii. At what point in the construction sequence will the proposed riffle be
constructed?
The proposed riffle can also be built in the same ‘half and half’ approach as
the culvert removal. The Culvert Removal Sequence plan sheet has been
revised to include additional notes to help clarify that the riffle is to be
constructed at the same time as the culvert removal and the half built in
phase 2 will be properly tied in to the phase 1 construction during phase 2.
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kimley-horn.com 421 Fayetteville Street, Suite 600, Raleigh, NC 27601 919 677 2000
b. Please provide a plan exhibit that clearly depicts the location and extents of the
proposed constructed riffle.
The minimum riffle length is 33’, which will cover the length of the existing culvert.
The riffle design can extend up to 5-10’ downstream and upstream of the culvert to
be removed to allow for some flexibility so the contractor can appropriately tie into the
natural channel grade depending on the size of the ‘hole’ left by the culvert removal.
The impervious dike will be placed to ensure the riffle construction and tie in points
are within the dry work zone as required by any applicable permit conditions from
USACE and NCDWR.
Attached to this RFI response package is a revised plan sheet exhibit showing the
location and extents of the proposed constructed riffle as well as the riffle detail.
To assist in your review of this RFI response, the following additional and/or revised information has
been included:
· Revised Erosion Control Sheets for the Culvert Removal Sequence
· Revised Constructed Riffle with Rock Sill Detail Plan Sheet
If you need any additional information to assist in your review of this RFI Response Package, feel free
to contact me at 919-678-4155 or [e-mail].
Sincerely,
Kimley-Horn and Associates, Inc.
Jason Hartshorn, PWS
Cc: Tim Athy, PE, Town of Holly Springs
REVISED
CULVERT REMOVAL SEQUENCE
H
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TOWN OF CARY
NORTH CAROLINA LLC
CLUBCORP GOLF OF
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HOLLY SPRINGS
TOWN OF
TOWN OF CARY
NORTH CAROLINA LLC
CLUBCORP GOLF OF
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HOLLY SPRINGS
TOWN OF
K:\DUR_Roadway\012329063 - Holly Springs Road-Ph 2\Plan\Plan Sheets\EC\012329063_ero_psh_5A.dgnPROJECT:
SHEET NUMBER:JOB NUMBER:
REV. No.:REVISION:DATE:DRAWN BY:CHECKED BY:
012329063
12/7/20200
PE NO. F-0102
PREPARED IN THE OFFICE OF:
PHONE: [phone]Copyright Kimley-Horn and Associates, Inc., 2019
shall be without liability to Kimley-Horn and Associates, Inc.
reliance on this document without written authorization and adoption by Kimley-Horn and Associates, Inc.
intended only for the specific purpose and client for which it was prepared. Reuse of and improper
This document, together with the concepts and designs presented herein, as an instrument of service, is
5025
HOLLY SPRINGS ROAD WIDENING PH. 2
U-6243
300 MORRIS STREET, SUITE 200, DURHAM, NC, 27701
EROSION CONTROL SHEETS
ALL SIGNATURES COMPLETED
DOCUMENT NOT CONSIDERED FINAL UNLESS
123 123
PHASE IIPHASE I
EC-5A
CULVERT REMOVAL SEQUENCE STA. 109+25 -L-
-L-
EXIST HOLLY SPRINGS ROAD
EXIST HOLLY SPRINGS ROAD
-L-
AT END, 10' LONG)
(10' APRON WIDTH AT OUTLET, 17' APRON WIDTH
EXISTING STREAM BANK/WING WALL
OF BARREL 3 BETWEEN IMPERVIOUS DIKE AND
PLACE EST. 12 TONS CLASS I RIP RAP AT OUTFALL
BE COMPLETED IN THE DRY. SEE STREAM STABILIZATION DETAIL ON SHEET 2G.
STABILIZATION WITHIN THE FOOTPRINT OF BARRELS 1 AND 2. ALL WORK MUST
ON CHANNEL BANK. RE-ESTABLISH STREAM BANK AND CONSTRUCT STREAM
5.) CONSTRUCT WEST BANK AND PLACE REQUIRED RIPRAP AND MATTING
MANAGEMENT.
4.) REFERENCE SHEET TMP SHEETS FOR ADDITIONAL DETAIL REGARDING TRAFFIC
WALL BETWEEN BARRELS 2 AND 3 SHOULD REMAIN.
3.) DEWATER THE AREA BEHIND THE DIKES. REMOVE BARRELS 1 AND 2. THE BARREL
RIP-RAP PAD AT OUTFALL OF BARREL 3 AS NOTED BELOW.
SHOWN IN SKETCH TO DIVERT FLOW INTO BARREL 3. INSTALL TEMPORARY
THE TMP PLANS, CONSTRUCT IMPERVIOUS DIKES #1 AND 2 AT LOCATION
2.) AFTER TRAFFIC HAS BEEN SHIFTED TO BRIDGE CONSTRUCTED IN PHASE I IN
EROSION CONTROL MEASURES TO STABILIZE WORK AREA.
1.) CONSTRUCT TEMPORARY SPECIAL STILLING BASIN, AND ALL OTHER TEMPORARY
7.) FINISH ROADWAY AND DRAINAGE CONSTRUCTION.
NEEDED FOR ROADWAY AND BRIDGE CONSTRUCTION, OR AS DIRECTED BY ENGINEER.
6.) STABILIZE DISTURBED AREA AND MODIFY EROSION AND SEDIMENT CONTROL DEVICES AS
5.) REMOVE TEMPORARY SPECIAL STILLING BASIN.
BARREL 3. ALL WORK MUST BE COMPLETED IN THE DRY. SEE STREAM STABILIZATION DETAIL ON SHEET 2G.
RE-ESTABLISH STREAM BANK AND CONSTRUCT STREAM STABILIZATION WITHIN THE FOOTPRINT OF
4.) CONSTRUCT EAST BANK AND PLACE REQUIRED RIPRAP AND MATTING ON CHANNEL BANK.
3.) REFERENCE TMP SHEETS FOR ADDITIONAL DETAIL REGARDING TRAFFIC MANAGEMENT.
AT OUTFALL.
2.) DEWATER THE AREA BEHIND THE DIKE. REMOVE BARREL 3 AND TEMPORARY RIP RAP INSTALLED
WORK COMPLETED IN PHASE 1 TO THE WORK IN PHASE 2.
CAN BE MOVED ACROSS THE CHANNEL AS WORK IS COMPLETED AND TO PROPERLY TIE IN THE
INTO FOOTPRINT OF OLD BARREL 2 AND RE-ESTABLISH STREAM BANK. PUMP DIVERSION OPERATION
1.) MOVE IMPERVIOUS DIKE#1 TO THE LOCATION OF DIKE#3 SHOWN IN SKETCH TO DIVERT FLOW
DIKE #1
IMPERVIOUS
DIKE #3
IMPERVIOUS
DIKE #2
IMPERVIOUS
NAD 83 NAD 83110110
REVISED
CONSTRUCTED RIFFLE
WITH ROCK SILL PLAN
SHEETS
-EL-21" HDPE24" CMP
MIDDLE CREEKMIDDLE CREEKK:\DUR_Roadway\012329063 - Holly Springs Road-Ph 2\Plan\Plan Sheets\012329063_psh_2G.dgnPROJECT:
SHEET NUMBER:JOB NUMBER:
REV. No.:REVISION:DATE:DRAWN BY:CHECKED BY:
012329063
12/21/20200
PE NO. F-0102
PREPARED IN THE OFFICE OF:
PHONE: [phone]Copyright Kimley-Horn and Associates, Inc., 2019
shall be without liability to Kimley-Horn and Associates, Inc.
reliance on this document without written authorization and adoption by Kimley-Horn and Associates, Inc.
intended only for the specific purpose and client for which it was prepared. Reuse of and improper
This document, together with the concepts and designs presented herein, as an instrument of service, is
5025
HOLLY SPRINGS ROAD WIDENING PH. 2
U-6243
300 MORRIS STREET, SUITE 200, DURHAM, NC, 27701
PLAN VIEW
SECTION B-B
GLIDE
SECTION A-A
R
IFFLE
CC
SECTION C-C
Riffle
TOE
A
A
TOEFLOWBANK
TOP OF
{NOT TO SCALE
AND (15%) NO. #57 STONE
OF (75%) CLASS "A", (10%) CLASS "B",
18" NOM. THICKNESS WELL GRADED MIX
NO. #57 STONE
(10%) CLASS "B", AND (15%)
GRADED MIX OF (75%) CLASS "A",
18" NOM. THICKNESS WELL
FOR DRAINAGE)
TYPE II (GEOTEXTILE
NONWOVEN FABRIC
FOR DRAINAGE)
TYPE II (GEOTEXTILE
NONWOVEN FABRIC
B
B
ROCK SILL
FOOTER BOULDER
RIFFLE
TOE OF
BOULDER
HEADER
8-10'
ELEVATION 312.00'
HEADER BOULDER
FILL VOIDS WITH STONE
ANY SIGNIFICANT SPACES,
BE GAPPED OR HAVE
BOULDER SHOULD NOT
1.0'
HEADER BOULDER
FOOTER BOULDER
TOP OF BANK
TOE OF SLOPE
THALWEG
ELEVATION 312.00'
DRAINAGE DETAILS
F. PLACE BACKFILL MATERIAL BEHIND HEADER BOULDERS ENSURING THAT ANY VOIDS BETWEEN THE BOULDERS ARE FILLED.
THE STREAM BED (AT THE THALWEG). THERE SHALL BE NO GAPS BETWEEN BOULDERS OR THALWEG SEAM BETWEEN HEADERS.
ON THE BACKFILL MATERIAL). HEADER BOULDERS SHALL SPAN THE SEAMS OF THE FOOTER BOULDERS. THERE SHALL NOT BE A SEAM IN THE CENTER OF
E. INSTALL HEADER BOULDERS ON TOP OF AND SET SLIGHTLY BACK FROM THE FOOTER BOULDERS (SUCH THAT PART OF THE HEADER BOULDER IS RESTING
D. PLACE BACKFILL MATERIAL BEHIND FOOTER BOULDERS.
C. INSTALL FILTER FABRIC.
B. PLACE FOOTER BOULDERS. THERE SHALL BE NO GAPS BETWEEN BOULDERS.
A. OVER-EXCAVATE STREAM BED TO A DEPTH EQUAL TO THE TOTAL THICKNESS OF THE HEADER AND FOOTER BOULDERS.
8. THE ROCK SILL IS GENERALLY CONSTRUCTED AS FOLLOWS:
7. IF NECESSARY BASED ON STABILITY OF NATIVE MATERIAL, A BEDDING OF GRADATION OF CLASS A AND #57 STONE MAY BE PLACED UNDER THE ROCK SILL.
6. MATERIAL UNDER CULVERTS TO BE REMOVED IS UNKNOWN. IF EXCAVATION OF MATERIAL UNDER CULVERTS EXCEEDS 5.0' IN DEPTH, CONSULT ENGINEER.
5. THE MINIMUM RIFFLE LENGTH TO BE INSTALLED IS 33 LINEAR FEET.
4. THE HEAD OF RIFFLE SHOULD BE LOCATED AT THE UPSTREAM EXTENT OF THE CULVERTS THAT ARE TO BE REMOVED OR WITHIN 5-10' UPSTREAM.
3. ROCK SILL SHOULD BE PLACED AT DOWNSTREAM EXTENT OF THE CULVERTS TO BE REMOVED, OR WITHIN 5-10' DOWNSTREAM OF THAT LOCATION.
2. A FOOTER BOULDER IS NOT REQUIRED IF THE HEADER BOULDER DEPTH MEETS OR EXCEEDS SILL DEPTH OF 4'
1. BOULDERS SHOULD BE NATIVE STONES OR SHOT ROCK, ANGULAR AND OBLONG, WITH A MEAN DIAMETER OF 30"
NOTE:
CONSTRUCTED RIFFLE WITH ROCK SILL DETAIL
SECTIONS
AND DOWNSTREAM
TIE IN TO UPSTREAM
APPROXIMATELY 24',
ABOVE STREAM INVERT
APPROXIMATELY 0.3-0.8'
4' AT AN ELEVATION
SILL MINIMUM OF
KEY-IN BOULDER
4' MIN
2' MIN
GROUND
EXISTING
ELEVATION 312.20'
HEAD OF RIFFLE
2G
ELEVATION 312.20'
HEAD OF RIFFLE
SEE ROADWAY PLANS
BANK STABILIZATION
SEE ROADWAY PLANS
BANK STABILIZATION
#57 STONE AS NECESSARY
RIP RAP, FILL VOIDS W/
SCOUR PROTECTION. CLASS A
10 LF OF 6" THICKNESS
312.00'
ELEVATION
1-2' MAX
CULVERT LOCATION
UPSTREAM OF EXISTING
EXTENDED UP TO 5-10'
OF RIFFLE MAY BE
SEE NOTE 4, HEAD
CULVERT FOOTPRINT
WITHIN THE EXISTING
RIFFLE MUST BE INSTALLED
MINIMUM, CONSTRUCTED
SEE NOTE 5, AT A
CULVERT LOCATION
DOWNSTREAM OF EXISTING
EXTENDED UP TO 5-10'
RIFFLE AND SILL MAY BE
SEE NOTE 3, DOWNSTREAM {{NAD 83
06 12
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