19951229 Ver 1_Complete File_19970924

State of North Carolina IT
Department of Environment, MIIWA
Health and Natural Resources 4 •
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary E) E H N
A. Preston Howard, Jr., P.E., Director
September 24, 1997
Wilkes County
WQC 401 Project #951229
APPROVAL of 401 Water Quality Certification
Coleman Long, Chief
Planning and Environmental Branch
U.S. Army Corps of Engineers
Post Office Box 1890
Wilmington, N.C. 28402-1890
Dear Mr. Long:
You have our approval, in accordance with the attached conditions, to place temporary fill in waters for the purpose of
inspecting the structural integrity of W. Kerr Scott Dam and Reservoir as you described in your application dated September 16,
1997. After reviewing your application, we have decided that this fill is covered by General Water Quality Certification Number
3114 This Certification allows you to use Nationwide Permit Number 33 when it is issued by the Corps of Engineers. In
addition, you should get any other federal, state or local permits before you go ahead with your project including (but not limited
to) Sediment and Erosion Control. Coastal Stormwater, Non-Discharge and Water Supply Watershed regulations. Also this
approval will expire when the accompanying 404 or CAMA permit expires unless otherwise specified in the General Certification.
This approval is only valid for the purpose and design that you described in your application. If you change your project,
you must notify us and you may be required to send us a new application. If total wetland fills for this project (now or in the
future) exceed one acre, compensatory mitigation may be required as described in 15A NCAC 2H.0506 (h). For this approval to
be valid, you must follow the conditions listed in the attached certification.
If you do not accept any of the conditions of this certification, you may ask for an adjudicatory hearing. You must act within
60 days of the date that you receive this letter. To ask for a hearing, send a written petition which conforms to Chapter 150B of
the North Carolina General Statutes to the Office of Administrative Hearings, P.O. Box 27447, Raleigh, N.C. 27611-7447. This
certification and its conditions are final and binding unless you ask for a hearing.
This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water Act. If you have
any questions, please telephone John Dorsey at 919-733-1786.
4incerely.n ,
oward, , r. P.E.
Attachment
ca Wilmington District Corps of Engineers
Corps of Engineers Raleigh Field Office
Winston-Salem DWQ Regional Office
Mr. John Dorney
Cenral Files
9512291tr
Division of Water Quality • Environmental Sciences Branch
Environmental Sdenoes Branch, 4401 Reedy Creek Rd., Raleigh, NC 27607 Telephone [phone] FAX # [phone]
An Equal Opportunity Aiftrmadve Action Employer • 50% recycled/10% post consumer paper
DEPARTMENT OF THE ARMY
WILMINGTON DISTRICT, CORPS OF ENGINEERS
P.O. BOX 1890
WILMINGTON, NORTH CAROLINA 28402-1890
IN REPLY REFER TO
September 16, 1997
EAU
sF,o ?FG
? ?9 Fo
Environmental Resources Section
Mr. Preston Howard, Jr., P.E.
Acting Director
Division of Environmental Management
North Carolina Department of Environment,
Health, and Natural Resources
Post Office Box 29535
Raleigh, North Carolina 27626-0535
Dear Mr. Howard:
This letter is in regar
the stilling basin at W. Kez
951229). A scope of work dE
and our intent to apply Nat:
letter dated October 23, 19!
Certification was provided L
i `?A
ctural inspections of
n',1 roir (DEM Project No.
?j tnS. ( Y`om' -ering and dewatering
o, aas transmitted by
'Vl 1? I 401 Water Quality
,_11. =r 28, 1995.
The work previously scheduled to occur between September 15 and
December 31, 1996, was not implemented at that time, due to scheduling
conflicts. We plan to conduct this operation during the early fall or
winter of 1997. Work may begin as soon as September 22, 1997, if
river-flow conditions are conducive. It is our understanding that the
401 approval dated November 28, 1995, is valid under the revised
schedule. This letter provides written notification of our revised
schedule. Other aspects of the project are as described in previous
correspondence.
If additional information is required, please call Mr. Chuck
Wilson of our Environmental Resources Section at [phone].
Sincerely,
Coleman Long
Chief, Planning and
Environmental Branch
r
-2-
Copy Furnished:
VMr. John Dorney
Division of Environmental Management
North Carolina Department of Environment,
Health, and Natural Resources
4401 Reedy Creek Road
Raleigh, North Carolina 27607-6445
Mr. Steve Mauney
Division of Environmental Management
North Carolina Department of Environment,
Health, and Natural Resources
585 Waughtown Street
Winston-Salem, North Carolina 27107-2241
Mr. Franklin T. McBride
Wildlife Resources Commission
North Carolina Department of Environment,
Health, and Natural Resources
512 North Salisbury Street
Raleigh, North Carolina 27604-1188
Mr. Joe Mickey
Wildlife Resources Commission
North Carolina Department of Environment,
Health, and Natural Resources
155 Timberbrook Trail
State Road, North Carolina 28676
Mr. Jim Meed
Division of Water Resources
North Carolina Department of Environment,
Health, and Natural Resources
Post Office Box 27687
Raleigh, North Carolina 27611-7687
DEPARTMENT OF THE ARMY
WILMINGTON DISTRICT, CORPS OF ENGINEERS 1
P.O. BOX 1890 6 O?
5W
WILMINGTON, NORTH CAROLINA 28402-1890 \ '? Ne
REPLY TO
I/ C
ATTENTION OF August 8, 1996
Environmental Resources Section
i'
0
Mr. Preston Howard, Jr., P . E . ??4y Jam!
Acting Director
Division of Environmental Management ^?scF
North Carolina Department of Environments
Health, and Natural Resources
Post Office Box 29535
Raleigh, North Carolina 27626-0535
Dear Mr. Howard:
This letter is in regard to proposed structural
inspections of the stilling basin at W. Kerr Scott Dam
and Reservoir (DEM Project No. 951229). A scope of
work describing required coffering and dewatering and
our intent to apply Nationwide Permit No. 33 was
transmitted by letter dated October 23, 1995. Your
approval of 401 Water Quality Certification was
provided by letter dated November 28, 1995.
As discussed with Mr. Greg Price by telephone on
July 31, 1996, the work originally scheduled to occur
between October 31 and December 31, 1995, was not
implemented at that time, due to our inability to
secure a contractor to conduct the operation. We plan
to conduct this operation during the early fall or
winter of 1996. Work may begin as soon as September 15
if river-flow conditions are conducive. It is our
understanding from discussion with Mr. Price that the
November 28, 1995, 401 approval is valid under the
revised schedule. This letter provides written
notification of our revised schedule as requested by
Mr. Price. Other aspects of the project are as
described in previous correspondence.

-2-
We would appreciate your written concurrence by
August 30, 1996. If additional information is
required, please call Mr. Chuck Wilson of our
Environmental Resources Section at [phone].
Sincerely,
Lloyd . Saunders; Ph.D.
Acting Chief, Planning and
Environmental Branch
Copy Furnished:
----JMr. John Dorney
Division of Environmental Management
North Carolina Department of Environment,
Health, and Natural Resources
4401 Reedy Creek Road
Raleigh, North Carolina 27607-6445
Mr. Steve Mauney
Division of Environmental Management
North Carolina Department of Environment,
Health, and Natural Resources
585 Waughtown Street
Winston-Salem, North Carolina 27107-2241
Mr. Franklin T. McBride
Wildlife Resources Commission
North Carolina Department of Environment,
Health, and Natural Resources
512 North Salisbury Street
Raleigh, North Carolina 27604-1188
Ik
-3-
Mr. Joe Mickey
Wildlife Resources Commission
North Carolina Department of Environment,
Health, and Natural Resources
155 Timberbrook Trail
State Road, North Carolina 28676
Mr. Jim Meed
Division of Water Resources
North Carolina Department of Environment,
Health, and Natural Resources
Post Office Box 27687
Raleigh, North Carolina 27611-7687
State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr„ Governor
Jonathan B, Howes, Secretary
A, Preston Howard, Jr., P.E., Director
APPROVAL of 401 Water Quality Certification
Mr. William Dawson, Chief
Engineering and Planning Division
U.S. Army Corps of Engineers
P.O. Box 1890
Wilmington, N.C. 28402-1890
Dear Mr. Dawson
QF
C) FE ["%A F1
November 28, 1995
Wilkes County
DEM Project # 951229
FILE Coil''
You have our approval to place temporary fill material in waters for the purpose checking the
structural integrity of the stilling basins at Kerr Scott Lake, as you described in your application dated
23 October 1995. After reviewing your application, we have decided that this fill is covered by
General Water Quality Certification Number 2727. This certification allows you to use Nationwide
Pennit Number 33 when it is issued by the Corps of Engineers.
This approval is only valid for the purpose and design that you described in your application. If
you change your project, you must notify us and you may be required to send us a new application.
For this approval to be valid, you must follow the conditions listed in the attached certification. In
addition, you should get any other federal, state or local permits before you go ahead with your
project.
If you do not accept any of the conditions of this certification, you may ask for an adjudicatory
hearing. You must act within 60 days of the date that you receive this letter. To ask for a hearing,
send a written petition which conforms to Chapter 150B of the North Carolina General Statutes to the
Office of Administrative Hearings, P.O. Box 27447, Raleigh, N.C. 27611-7447. This certification and
its conditions are final and binding unless you ask for a hearing.
This letter completes the review of the Division of Environmental Management under Section 401
of the Clean Water Act. If you have any questions, please telephone John Domey at 919-733-1786.
Attachment
cc: Wilmington District Corps of Engineers
Winston-Salem DEM Regional Office
Mr. John Domey
Central Files
Chuck Wilson; COE Wilmington
sin ly,
to4nnoo 4rr,, r. P
951229.1tr
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affrmative Action Employer 50% recycled/ 10% post-consumer paper
DEPARTMENT OF THE ARMY
WILMINGTON DISTRICT, CORPS OF ENGINEERS 5W
P.O. BOX 1890 .,..,.....
WILMINGTON, NORTH CAROLINA 28402-1890 ?•ARe
REPLY TO October 23, 1995
ATTENTION OF
Environmental Resources Section
Mr. Preston Howard, Jr., P.E.
Acting Director Division of Environmental Management 0//?4
North Carolina Department of Environment, ti y ?
Health, and Natural Resources Jti?F Q &
Post Office Box 29535 Raleigh, North Carolina 27626-0535 '`Co
Dear Mr. Howard:
This letter is in regard to proposed structural inspections
of the stilling basin at W. Kerr Scott Dam and Reservoir. The
W. Kerr Scott Dam and Reservoir on the Yadkin River is a U.S. Army
Corps of Engineers project placed in operation on June 1, 1963.
The stilling basin feature of the dam outlet works is a reinforced
concrete U-shaped structure about 129 feet long, extending from
about a 12-foot width at the outlet conduit to about 55 feet at
the downstream end sill. The structure has 11 concrete baffle
blocks on the basin floor. Periodic structural inspection is
required to assure the integrity of the structure.
The stilling basin was last inspected in 1987 by divers
without dewatering. However, the proposed inspection will require
a dewatered condition to verify previous findings and to determine
the extent, if any, of increased deterioration. The inspection
contractor will install a coffering system and dewater the
stilling basin using pumps.
The Yadkin River is the principal source of water for several
businesses and towns downstream and sustains fisheries habitat.
Therefore, the time allotted for closing the gates, dewatering,
and inspection is critical. Reservoir releases through the
stilling basin will be interrupted for no more than 12 hours.
This period includes a 1 1/2-hour allotment for the inspection.
During these 12 hours, the Contractor must set his coffering,
dewater, maintain a dry inspection area, and remove the coffering
and dewatering system after completion of the inspection. The
dewatering operations will be conducted between October 31 and
December 31, 1995. The Contractor will be given a 3-day
notification prior to the date the dewatering operations are to
occur. A Scope of Work that describes the proposed action is
enclosed.
Printed on ® Recycled Paper
-2-
Your general water quality certification pursuant to
Nationwide Permit No. 33 authorizes discharges of fill material
for temporary construction including cofferdams and dewatering in
navigable waters of the United States. We have discussed this
proposal with Mr. Steve Mauney of your Winston-Salem Field Office,
Mr. Joe Mickey of the North Carolina Wildlife Resources Commission
(NCWRC), and Mr. Jim Meed of the North Carolina Division of Water
Resources. Their comments and standard permit conditions were
considered in the development of the proposed plan. We have
determined that impacts from this action are temporary and minor
and propose to proceed upon your written concurrence. We will
notify your office, the NCWRC, potentially affected major water
users, and downstream industry prior to commencement of work.
Flow and temperature conditions favorable for the completion
of this work with minimal environmental impacts are expected
during November through December. We would, therefore, like to
have clearance to proceed by October 30, 1995. If additional
information is required, please call Mr. Chuck Wilson of our
Environmental Resources Section at [phone].
Sincerely,
William R. Dawson, P.E.
Chief, Engineering and
Planning Division
Enclosure
??Copies Furnished:
VMr. John Dorney
Division of Environmental Management
North Carolina Department of Environment,
Health, and Natural Resources
4401 Reedy Creek Road
Raleigh, North Carolina 27607-6445
Mr. Steve Mauney
Division of Environmental Management
North Carolina Department of Environment,
Health, and Natural Resources
585 Waughtown Street
Winston-Salem, North Carolina 27107-2241
-3-
Mr. Franklin T. McBride
Wildlife Resources Commission
North Carolina Department of Environment,
Health, and Natural Resources
512 North Salisbury Street
Raleigh, North Carolina 27604-1188
Mr. Joe Mickey
Wildlife Resources Commission
North Carolina Department of Environment,
Health, and Natural Resources
155 Timberbrook Trail
State Road, North Carolina 28676
Mr. Jim Meed
Division of Water Resources
North Carolina Department of Environment,
Health, and Natural Resources
Post Office Box 27687
Raleigh, North Carolina 27611-7687
V
SCOPE OF WORK
DEWATERING STILLING BASIN
W. KERR SCOTT DAM AND RESERVOIR
WILKES COUNTY, NORTH CAROLINA
1. Background
The W. Kerr Scott Dam and Reservoir on the Yadkin River was
completed and placed in operation 1 June 1963. The stilling
basin feature of the dam outlet works is a reinforced concrete U-
shaped structure 129 feet 3-3/4 inches long, extending from
12.25-foot width at the outlet conduit to 54.5 feet at the
downstream end sill. The structure has eleven concrete baffle
blocks on the basin floor. The average tailwater elevation is
964.5 M.S.L. See Attachment 1 for stilling basin details.
The stilling basin was last inspected in 1987 by divers
without any attempt to dewater. This time an inspection will be
conducted in a dewatered condition to verify previous findings
and to determine the extent, if any, of increased deterioration.
The Contractor shall furnish all plant, labor and materials
and perform all operations in connection with installing a
coffering system and dewatering the stilling basin.
2. Coffering System
The contractor shall provide a coffering system capable of
preventing the tailwater downstream of the end sill from entering
the stilling basin. The design of the coffering system shall be
the responsibility of the contractor but subject to review by the
contracting officer. After completion of the inspection by
Government personnel, the coffering system shall be completely
removed and disposed of off government property. Care shall :_be_._,
taken to avoid any damage to the existing structure but should
any occur, repairs shall be made at the Contractor's expense.
3. Dewatering
The dewatering system shall be of sufficient size and
capacity to pump water from the entire stilling basin to render
it in a dry condition for inspection of the concrete floor. A
dry condition is achieved when no free water is ponded on the
stilling basin floor. Special efforts may be required to control
and route leakage flows from the conduit to allow all floor
surface areas to be visually inspected without the presence of
standing water. However, a portion of the floor may be used to
route water if contained at any one time. Leakage of
approximately 3 cfs from the intake tower service gates should be
anticipated. The design of the dewatering system shall be
responsibility of the Contractor but subject to review by the
Contracting Officer.

4. Back-up System
If, the primary dewatering pumping system fails a back-up
system able to perform at 100 percent capacity of the primary
system shall be immediately available and placed in operation to
satisfy the time constraints once the gates have been closed.
5. Time Constraints
The Yadkin River is the principle source of water for
several businesses and towns downstream and sustains
environmental habitats. Therefore, the time allotted for closing
the gates, dewatering, and inspection is critical.
Reservoir releases through the stilling basin shall be
interrupted for no more than 12 hours. This period includes 1-
1/2 hours allotment for the inspection. During this 12 hours,
the Contractor must,set his coffering, dewater, maintain a dry
inspection area and remove coffering and dewatering system after
completion of the inspection.
The dewatering operations will be conducted between 31
October and 31 December, 1995. The Contractor will be given a 3
day notification prior to the date the dewatering operations are
to occur.
6. Equipment Access.
Access to the work site downstream of the stilling basin is
available from the service road on the south side of the stilling
basin.
7. Restoration.
The work site shall be restored to its original condition
after completion of the dewatering and coffering operations.
8. Submittals
The Contractor shall submit to the Contracting Officer for
review prior to any coffering work, his plan for dewatering. The
submittal shall include as a minimum the number, type and
capacity of pumps, type and extent of coffering system and safety
procedures.
6. Safety Requirements
The Corps of Engineers Safety and Health Requirements Manual
(EM 385-1-1, October 1992), is applicable to work to be
--- performed.

Y
0
a
Y
D '
o
O
H
A4
Y
W ?
N
H
}
w I r. H
? S
V1 s
W - w i i' rl H
O 1
••"s ? W f
J
'w . ? so Q Z
°
co E-4
Y Y ? t
CL

80L
a = '
w
V W 8 8 8 e
£ ¦ M
i r-
• ? I 10I
0
M
N Q
V
Q O
Z- in
J - v
a z
o ?
c?
0
M6-
N

H
HQ
z
O
U
pN
O
W
a
0
c
0
r
C"
P
Y
C
N W
2 t
O N
? o u
v ?
W 4.
N t
Occ
W
II

.,l
OCT-24-1995 1506 FROM DEHNR Winston-Salem TO 89197339959 P.01
P.
'It
North Carolina Department of
Environment, Hoalth, and Natural
. ftesouroes
Division of Environmental Management
Water Quality Section
Winstorp-Setem Raglorial:Q ae
FAX
Ile
#? of Roo FAX. # -
-- - - -
FROM: 4U ,..,
j?r -<C/--5- 7Oy15- rr.-r
NOTE: te
Terry
IAVI (4 7`000 7//!??
M lbi owm ft "L w mews awn. NC 27147.2119 OW771.46W 0 FAX 010-771-MI
OCT-24-1995 15:06 FROM DEHNR Winston-Salem TO
DEPARTMENT +OP,TNE ARMY
WaimNCiT" UNKR OT, calm OF moomem
RO. WX is"
WILMINOTON, NORTH CA"XJM 204W-"00
G)ATnWr=QF October 2a,:.1995
Environmental Resources Section
Mr. Preston Howard, Jr., P.E.
Acting Director
Division of Environmental Management
North Carolina Department of Environment,
Health, and Natural Resources
Post Office Box 29535
Raleigh, North Carolina 27626-0535
Dear Mr. Howard:
89197339959 P.02

REGENED
N.G. Dept. of EHN91
O CT 2 It 1995
Winston-Salem
Regional OT(im
This letter is in regard to proposed structural inspections
of the stilling basin at W. Kerr Scott Dam and Reservoir. The
W. Kerr Scott Dam and Reservoir on the Yadkin River is a U.S. Army
Corps of Engineers project placed in operation on June 1, 1963.
The stilling basin feature of the dam outlet works is a reinforced
concrete U-shaped structure about 129 feet long, extending from
about a 12-foot width at the outlet conduit to about 55 feet at
the downstream end sill. The structure has 1.1 concrete baffle
blocks on the basin floor. Periodic structural inspection. is
required to assure the integrity of the structure.
The stilling basin was last inspected in .1987 by divers
without dewatering. However, the proposed inspection will require
a dewatered condition to verify previous findings and to determine
the extent, if any, of increased deterioration. The inspection
contractor will install a coffering system and dewater the
stilling basin using pumps.
The Yadkin River is the principal source of water for several
businesses and towns downstream and sustains fisheries habitat.
Therefore, the time allotted for cloning the gates, dewatering,
and inspection is critical. Reservoir releasas through the
stilling basin will be interrupted for no more than 12 hours.
This period includes.a 1 1/2-hour allotment for the inspection.
During these 12 hours, the contractor must set his coffering,
dewater, maintain a dry inspection area, and remove the cof6 ring
and dewatering system after completion of the inspection. The
dewatering operations will be conducted between October 31 and
December 31, 1995, The Contractor will be given a 3-day
notification prior to the date the dewatering operations are.to
occur. A Scope of Work that describes the proposed action is
enclosed.
pnrrod on MeyeMe paper
OCT-24-1995 15:07 FROM DEHNR Winston-Salem TO 89197339959 P.03
w
-Z-'
Your general water quality certification pursuant to
Nationwide Permit No. 33 authorizes. discharges. of fill A tt$rial
for temporary construction including cofferdatis.and dewatiririg in
navigable waters of the United States. We have discussed thi.s
pproposal with Mr. Steve Mauney of your-Winston-Salem Field Office,
Mr. Joe Mickey of the North Carolina Wildlife Resources Commission
(NCWRC), and Mr. Jim Meed of the North. Carolina Division of Water
Resources. Their comments and stahdard permit conditions were
considered in the development of thal.proposed plan. We h6*9
determined that impacts from this action are temporary and minor
and propose to proceed upon your written concurrence. We will
notify your office, the NCWRC, potentially affected major water
users, and downstream industry prior to commencement of work.
Flow and temperature conditions favorable for the dom letion
of this Work with minimal environmental impacts are eXpeCted
during November through December. We would, therefore, like to
have clearance to proceed by October 30, 1996. If additional
information is required, please cal.lAr. Chuck Wilson of dVr
Environmental. Resources Section at [phone].
Sincerely,
William R. Dawson, P:E.
Chief, Engineering and.
Planning Divi$iDn
Enclosure
Copies Furnished.
Mr. John Dorney
Division of Environmental Management-
North Carolina Department of EnvironM.eot,
Health, and Natural Resources
4401 Reedy Creek Road
Raleigh, North Carolina 27607-6445
Ar. Steve Mauney
Division of Environmental Management
North Carolina Department of Envirdoment,
Health, and Natural Resources
585 Waughtown Street
Winston-Salem, North Carolina 27107-2241
. 11
OCT-24-1995 15:07 FROM DEHNR Winston-Salem TO
• Y
-3-.
Mr. Franklin T. McBride
Wildlife Resources Commission
North Carolina Department of Environment,
Health, and Natural Resources
512 North Salisbury Street
Raleigh, North Carolina 27604-1188
Mr. Joe Mickey
Wildlife Resources Commission
North Carolina Department of Environment,
Health, and Natural Resources
155 Timberbrook Trail
State Road, North Carolina 28676
Mr. Jim Meed
Division of Water Resources
North Carolina Department of Environment,
Health, and Natural Resources
Post Office Box 27687
Raleigh, North Carolina 27611-7687
89197339959 P.04
OCT-24-1995 1508 FROM DEHNR Winston-Salem
4
TO 89197339959 P.05
?? : bF` •.?OlZK
bEPTATERI2Qt3 BTILLZ?iG ]?1N
W. K=M SCOT'1,' 1DAR AND R>9'us$l in .
WXUES COV"Y,. 'NO'RTH CAROLINA.
i . llar?kc?r±outid
The W. Karr Scott Dam and Reservoir on the Yadkin River vats
completad and placed in operation I' June 1963. The stilling
basin feature of the dam outlet works is a reinforced concrete U-
Shaped structure 129 feet 33/4 inches long, extending from
12.25-foot width at the outlet ooriduit to $4.5 feet at the
downstream and sill. The structure has eleven ooncrete baffle
blocks on the. basin floor. The aVokagge tailwater elevation is
964.5 M:S.L. See Attachment 1 for stilling basin details.
The stilling basin was last inspected, in 1987 by divers
without any attempt to dewater. This time an inspection Will be
conducted in a dawatered condition to verify previouis..findinngqs
and to determine the extent, if any., of increased deterioration.
The Contractor shall furnish all plant, labor and materials
and perform all operations in connection with installing a
coffering system and dewateri,ng the stilling basin.
2. C_Q=eri._ .System
The Contractor Shall provide 'd ,coffering systdm .capable .of
preventing the. tailwdter downstreaim of the end gill from entgring
the stillirntqq bas:i.n. The design of .the cOffering system shall -bb
the responsibility of the aontractor but Oubiact to xevLei v by the
Contracting Officer. After eoWletion of the inspection by ; ;:..
Goverrnpent personnel, the cOffer3 g.systet shall he completely
rem0'Vlsd and disposed of off gov merit prpperty, ca R .8h?1.
taken to avoid any damage to the: :existing :structure . but should
dik,Y OCCUr, repairs shall b,& leads' ' at the Coxstraato ? a ? ;;experie8 :;; ? : ` `;
3 • 1Q '3'; • =.=
The dewatering system xhal1..lee of suiticient 8*** . and
capacity to pump water from the entire. stilling basin :to retzder
it in adry condition for inspection of the conerata`flaor.° A -.-
dry *Ondition is achieved when no free water is ponded on the
stilling basin floor. Special efforts may. be rwPired, to control.
and route leakage flows from.the 'cc Muit to allow . all, floor
surface areas to be visually,inspeot6d without the Swesence of
standing water,. However, a portiaiiof the: floor may be used to
route. water it contained at any one time. Leakage 6f
apptdXL* ably 3 cis from the iri c® .tearer .s®icvice`gate sh+ou3d?be -
anticipated. The design of the de"texing' system nllall be
responsibility of the contr&otor but subjt0t to roview by the
Contracting Officer.

n
w
OCT-24-1995 1508 FROM DEHNR Winston-Salem
rw
TO 89197339959 P.06
4. Aack-ub System
If, the primary dewatering. pumping system fails.'a back-up
syGtem able to perform at 100 .percent capacity of. the primary
eyst:em shall be immediately..available and plaaed0' operation to
satisfy the time constraints 0400 the gates have' .bean closed.
5- Time ConstzAints
The Yadkin River is the principle source of water for
several busi.nesseei and towns downstream and sustairw
environmental habitats. Tharefoiti,,:the time allotted for closing
the gates, dewatering, and inspection is critical.
Reservoir releases through the stilling basin shall be
interrupted for no more than 12-hours. This period includes x-
1/2 hours allotment for the inspection. During this 3.2 hours,
the Contractor nuat\ eot his ootiering, devater, nai .gain at dry
inspection area 'and remove coffering and davaterinq ayateoaa aftex
completion of the inspection:
The dewat6ring operations gill be conducted betioeen 31
October and 32, December, 1995.. The Contractor will be given a 3
day notification prior to the..date :the dewatering _dperat.ions -axe ,
to occur.
6- AM3i8 cae$a.
ACKMBN to the cork site dM mat r6am of the st'Ill1ng basin in
available from. the service road : on the mouth side of.:trhe. j LIX3r
basin.

The work mite, si ll 'be -V,60 to its
after letion of t h ._degi - "? - :-?-'
comp .at?'_Oiifl cof'feriny cpaiAtii-s.?,-:;,;?;,;?•:
NMi w4Y?M•
The Contractor shall submit ,:tab. +.he coht Tact uu g •. oft. dIke fur .?? --
review prior to any cofferin4''iroi ,, `.hi a plan for
submittal shall include as -. a -the nwiber, t
capacity of ptamps, type and *Xtant of coffering. s !s?:-and -slltety
procedures.. ..
6. K41--sty _KWUirement:9
The Corps-of Engineers Safety ."d Health Requirem"Ito Manual
385-1-1, October 1992), Is appyi;,oable to work to be

OCT-24-1995 15109 FRO M DEHNR Winston-Salem TO 89197339959 P.07

pp
S1 ` .

TOTAL P.07