20200859 Ver 2_Minor Modification Revision for impact OW5_20211025

Strickland, Bev
From: Boone, Kelly <[e-mail]>
Sent: Monday, October 25, 2021 3:38 PM
To: Johnson, Alan
Subject: [External] Construction Method Revision for DWR 20-0859
Attachments: C-20 Union Co YRWP Finished Water Transmission Main.pdf
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Hi Alan,
Per our discussion this afternoon —
The contractor for the Union County Yadkin Regional Water Supply - Finished Water Transmission Main project is
proposing a change to the originally permitted method of construction for a stream crossing a pond. The permit for this
project is DWR# 20-0859. The location is off Roanoke Church Rd near Hillcrest Church Rd in Union County. The impact
number from the 401 WQC permit is OW5, and the permitted impact is 0.106 ac (temporary). The plan sheet is
attached. The original plans showed a construction method using a portable cofferdam such as a Portadam, within the
40-foot easement. However, the pipeline contractor has requested to not use a Portadam, but to instead lower the
water in the pond to dewater the work area, and would install the pipe in the same location as proposed using a
stone/soil mat for the equipment. The contractor obtained permission from the landowner to lower the water in the
pond.
Please let me know if this presents any problems. Based on our discussion, my understanding is that you are OK with
this. I also talked to Bryan Roden -Reynolds of USACE on the phone today and he was OK with this change of construction
method. The contractor has also discussed this method change with the DEMLR inspector who has been to the site.
Please let me know if you have questions or need additional information.
Thanks,
Kelly
Kelly R. Boone, PE, PMP I CDM Smith 15400 Glenwood Avenue, Suite 400
Raleigh, NC 27612 I T/F: 919.325.3508 I [e-mail] I cdmsmith.com
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WATER CROSSING NOTES:
1. CONTRACTOR MAY ELECT TO BYPASS PUMP AS NEEDED TO PREVENT FLOODING
ON EITHER SIDE OF ROANOKE CHURCH ROAD. CONTRACTOR MUST NOTIFY NCDOT
PRIOR TO PLACING DEWATERING HOSE ACROSS ROANOKE CHURCH ROAD.
APPROPRIATE SIGNAGE SHALL BE REQUIRED AND COORDINATED WITH NCDOT.
2. PORTABLE COFFERDAM CONSTRUCTION SHALL BE PERFORMED IN ONE PHASE.
3. THE WIDTH OF THE COFFERDAM SHALL BE DETERMINED BASED ON THE AREA
REQUIRED TO PERFORM THE WORK, BUT SHALL NOT EXTEND BEYOND THE LIMITS
OF DISTURBANCE SHOWN ON THE PLANS. THE COFFERDAM AREA WILL BE
MINIMIZED TO EXTENT POSSIBLE.
4. WATER SHALL NOT BE PERMITTED IN THE TRENCH DURING CONSTRUCTION.
DEWATER PER THE TECHNICAL SPECIFICATIONS. ALL WATER REMOVED FROM THE
WORK AREA SHALL BE CONTAINED AND CONTROLLED PRIOR TO DISCHARGING INTO
THE WATERBODY. ALL DEWATERING SHALL BE PERFORMED USING A SEDIMENT
BAG, SETTLING BASIN, OR OTHER APPROVED MEASURE TO ACHIEVE TURBIDITY
LIMIT. A TURBIDITY CONCENTRATION OF NOT MORE THAN 50 NTUS SHALL BE
MAINTAINED. IF A CONCENTRATION EXCEEDS 50 NTUS, ADDITIONAL MEASURE(S) TO
CONTAIN AND CONTROL TURBIDITY WILL BE INSTALLED AND THE DISCHARGED
WATER TESTED TO ENSURE COMPLIANCE. AT NO POINT SHALL TURBID WATER,
EXCAVATION MATERIAL, OR ANY OTHER FOREIGN MATERIAL BE DISCHARGED INTO
THE WATERBODY. A TURBIDITY CURTAIN WILL BE INSTALLED ALONG THE
DOWNSTREAM SIDE OF THE COFFERDAM THAT SHALL REMAIN IN PLACE WHILE
WORK IN THE WATERBODY IS OCCURRING. WATER DISCHARGED INTO THE BUFFER
FROM CONSTRUCTION RELATED ACTIVITIES WILL BE DIFFUSED PRIOR TO ENTERING
THE BUFFER TO PREVENT EROSION.
5. NON -WOVEN FILTER FABRIC TO BE INSTALLED BENEATH AND ALONG TRENCH
WALLS UP TO 18-INCHES FROM CHANNEL BOTTOM.
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\ \ \ \ DB 6661 PG RUSTEE D- N=477884.47
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A SILT FENCE (TYP) _ / 601 F's110
PLAN
1 " = 40'
EXISTING
GROUND
TOP
OF PORTADAM = 498.0
BASELINE OF CONSTRUCTION
PORTADAM SUPPORTS IN
TARGET WSE DURING
—
BACKGROUND (TYP)
CROSSING DURING
—
DRY WEATHER = 497.0
-----------------
=
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+
36" TRANSMISSION
MAIN
a
(n
MAX PORTADAM DEPTH
OF 10 FEET ALLOWING
=
A
PORTADAM INSTALLLATION
CD7_10
2-3 FEET FOR SEDIMENT
REMOVAL TO STABILIZE
PORTADAM
QI
193+00 194+00 195+00 196+00 197+00 198+00
PROFILE
HORIZ: 1 " = 40'
VERT: 1 " = 10'
199+00
200+00
201 +00
202+00
620
610
MR
ME
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ryAo,.,a000�„�aaasa,00000=�9 2021.07.13
08:00:04-04'00'
DESIGNED BY: K. LOWE
DRAWN BY: C. SCOTT
SHEET CHK'D BY: B. WILLIAMS
CROSS CHK'D BY: K. LOWE
APPROVED BY: J. LAPSLEY
DATE: APRIL 2021
OXA C0&
CDM �� 1842 y�
Smith * *
=
4600 Park Road, Suite 240 2 <y w� =
Charlotte, NC 28209 0 ;�-,•
Tel: -125342-4546 �rH CaAR�
NC F-1255
UNION COUNTY PUBLIC WORKS
UNION COUNTY, NORTH CAROLINA
YADKIN REGIONAL WATER SUPPLY
WATER TREATMENT PLANT AND
FINISHED WATER INFRASTRUCTURE
WATE R TRAN M I I N MAI N
S SS O
PLAN AND PROFILE
STA. 192+00 TH RU STA. 203+00
PROJECT NO. 28600-231695
FILE NAME: CO20PLPR.DWG
SHEET NO.
C-20
1
06/21
VCS
JSL
TURBIDITY CURTAIN CLARIFICATIONS
NO.
DATE
DRWN
CHKD
REMARKS
ISSUED FOR CONSTRUCTION