20070721 Ver 2_More Info Received_20220120 (2)

NORTH FORK RESERVOIR DREDGING PLAN
HENDERSON COUNTY, NORTH CAROLINA
USACE ACTION ID: SAW-2020-01908
CITY OF HENDERSONVILLE CONTRACT #: 19010
PROJECT
DIRECTORY
SPONSOR
CITY
OF
HENDERSONVILL
Hnderscivr1Iee
Water
jSewer
Adam
Utilities
(828)
[e-mail]
Steurer,
233-3207
Engineer
PE
ENGINEER
JENNINGS
ENVIRONMENTAL
PLLC
Greg
President
(919)
[e-mail]
Jennings,
600-4790
PhD,
PE
Jennings
Environmental
ENV.
PERMITTING
CLEARWATER
ENVIRONMENTAL
INC.
An
CLear\AJaer
Clement
Senior
(919)
[e-mail]
Scientist
698-9800
Riddle
EnviroScience
Company
SHEET
INDEX
COVER
SHEET
4.0
DREDGING
OPERATIONS
PLAN
SPECIFICATIONS
4.1
EXISTING
SITE
CONDITIONS
5.0
DREDGING
OPERATIONS
PLAN
6.1-6.4
HAUL ROUTE
DISPOSAL SITE - HENDERSONVILLE'.\ATER PLANT
IDREDGE SITE - N FORK RESERVOIR
U-II "ph.
0 5 1 2 Miles
NORTH I I I I I I I I
42
rix: .
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8.5 MILE HAUL ROUTE
MIS'
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- Cernmr rlty �,.. °
PRELIMINARY DRAWING
NOT RELEASED FOR CONSTRUCTION
JANUARY 19, 2022
z
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w
w
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NORTH FORK M
COVER SHEET
PRELIMINARY
DRAWING
REVISIONS:
CoH: 01/28/2021
DWR: 01/19/2022
DATE: 01/19/2022
PLOT SIZE: 24" x 36"
AS NOTED
H.D.: NAD83 (SCSP)
V.D.: NAVD88
JE PID: 8102
4.0

DREDGING OPERATIONS GENERAL NOTES
1. THE PURPOSE OF THIS WORK IS TO REMOVE ACCUMULATED
SEDIMENT IN N. FORK RESERVOIR DEPOSITED BY BIG CREEK
AND FLETCHER CREEK TO MEET AND MAINTAIN WATER SUPPLY
DEMANDS FOR THE CITY OF HENDERSONVILLE. UP TO 7,500 CY
OF SEDIMENT MAY BE DREDGED FROM THE RESERVOIR.
2. THIS WORK IS AUTHORIZED BY PERMITS FROM USFS, USACE,
NCDWR AND NC DEMLR. ALL GENERAL AND SPECIAL PERMIT
CONDITIONS SHALL BE FOLLOWED FOR THE DURATION OF THE
DREDGING OPERATIONS.
3. DURING PROJECT IMPLEMENTATION, EROSION CONTROL
MEASURES SHALL BE IMPLEMENTED TO REDUCE
SEDIMENTATION INTO BIG CREEK, FLETCHER CREEK, N. FORK
RESERVOIR AND N. FORK MILLS RIVER. EFFORTS SHALL BE MADE
TO LIMIT AND EXPEDITE EQUIPMENT TIME SPENT WORKING IN
THE RESERVOIR. WHEN POSSIBLE, WORK WILL OCCUR FROM
THE TEMPORARY ACCESS RAMPS.
4. CONSTRUCTION WORK WITHIN THE RESERVOIR SHALL OCCUR
BETWEEN APRIL 16 AND OCTOBER 14. A TROUT BUFFER
DISTURBANCE MORATORIUM IS IN EFFECT FROM OCTOBER 15
TO APRIL 15 FOR FLETCHER CREEK, BIG CREEK, N. FORK
RESERVOIR AND N. FORK MILLS RIVER.
5. CONTRACTOR SHALL CONTACT NORTH CAROLINA WILDLIFE
RESOURCE COMMISSION AT LEAST TWO (2) WEEKS PRIOR TO
MOBILIZATION AND CONSTRUCTION ACTIVITIES TO SCHEDULE
A PRE -CONSTRUCTION MEETING WITH NCWRC, THE
CONTRACTOR AND THE ENGINEER.
6. SENSITIVE AQUATIC SPECIES MAY BE LOCATED WITHIN THE
PROJECT AREA. NCWRC AND NCFS WILL PERFORM A SURVEY
TO DETERMINE IF RELOCATION OF SENSITIVE AQUATIC
ORGANISMS IS NECESSARY.
7. ALL TREES, UTILITIES AND OTHER SITE FEATURES WILL BE
PROTECTED UNLESS MARKED FOR REMOVAL OR RELOCATION.
8. EQUIPMENT SHALL BE WELL -MAINTAINED, CLEANED PRIOR TO
MOBILIZATION, AND CHECKED DAILY FOR LEAKS OF
PETROLEUM PRODUCTS.
9. FUELING SHALL BE PERFORMED IN THE DESIGNATED STAGING
AREA AT LEAST 100 FEET AWAY FROM SURFACE WATERS.
10. CONSTRUCTION SCHEDULING AND STAGING SHALL BE TIMED
TO EFFICIENTLY COMPLETE THE WORK AND MINIMIZE THE
AMOUNT OF TIME SPENT WORKING IN THE RESERVOIR.
11. TO THE EXTENT POSSIBLE, DREDGING OPERATIONS SHALL BE
TIMED TO OCCUR DURING TIMES OF LOW FLOW
12. DREDGING OPERATIONS SHALL NOT OCCUR IN THE RESERVOIR
DURING WET WEATHER OR STORMFLOWS.
13. AN APPROPRIATELY SIZED LONG REACH EXCAVATOR SHALL BE
UTILIZED TO PREVENT EXCESSIVE TRACKING AND SEDIMENT
DISTURBANCE WITHIN THE RESERVOIR.
14. ALL DREDGED SEDIMENT SHALL BE HAULED TO AND DISPOSED
OF IN THE DESIGNATED AREA AT THE CITY OF
HENDERSONVILLE WATER TREATMENT PLANT AS SHOWN ON
SHEET 2.3.
15. ANY TURBID WATER GENERATED IN THE RESERVOIR DURING
DREDGING OPERATIONS CAN BE PUMPED INTO THE WATER
INTAKE FOR TREATMENT AT THE CITY OF HENDERSONVILLE
WATER TREATMENT PLANT.
16. SITE ACCESS AND STAGING
A. ACCESS TO THE N. FORK RESERVOIR SHALL OCCUR VIA
WASHE CREEK ROAD (FS 5000) AND HENDERSONVILLE
RESERVOIR ROAD.
B. A DESIGNATED STAGING AREA SHALL BE ESTABLISHED OFF
OF THE EXISTING GRAVEL ROAD NEAR THE RESERVOIR AS
SHOWN IN THE DRAWINGS.
C. CONSTRUCTION ROUTES WITHIN THE LOD SHALL UTILIZE
EXISTING GRAVEL ROADS, ACCESS RAMPS AND OCCUR
OUTSIDE THE 25' TROUT BUFFER TO THE MAXIMUM EXTENT
PRACTICAL. ALL ROCK USED FOR TEMPORARY ACCESS
RAMPS SHALL BE REMOVED FROM THE RESERVOIR AND
WORK AREA.
17. SILT FENCE AND EROSION CONTROL WATTLES
A. PRIOR TO ANY DREDGING AND HAULING, SILT FENCE AND
EROSION CONTROL WATTLES SHALL BE INSTALLED AS
SHOWN IN THE DRAWINGS. AT THE END OF THE PROJECT,
WHEN ALL DISTURBED AREAS HAVE BEEN STABILIZED, ALL
SILT FENCE AND WATTLES SHALLE BE REMOVED. MATERIAL
SPECIFICATIONS, INSTALLATION PROCEDURES, AND
MAINTENANCE SHALL CONFORM TO SECTION 6.62 OF THE
NORTH CAROLINA SEDIMENT CONTROL PLANNING AND
DESIGN MANUAL.
18. TEMPORARY DIVERSION CHANNELS
A. SANDBAGS, BERMS, LINED CHANNELS OR OTHER DIVERSION
STRUCTURES SHALL BE USED TO AVOID EXCAVATION AND
DREDGING IN FLOWING WATER.
B. ALL MATERIALS USED FOR FLOW DIVERSIONS SHOULD BE
REMOVED FROM THE RESERVOIR AFTER COMPLETING THE
WORK.
C. ALL DIVERSION CHANNELS SHALL BE LINED.
19. TRUCK HAULING SEQUENCE
A. TRUCKS SHALL BE USED TO HAUL DREDGED MATERIAL FROM
N. FORK RESERVOIR TO THE HENDERSONVILLE WATER
TREATMENT PLANT. THE TYPE, SIZE AND CAPACITY OF THE
TRUCKS SHALL BE SIZED TO EFFICIENTLY HAUL DREDGE
MATERIAL AND SHALL MEET ALL USFS, LOCAL, STATE AND
FEDERAL ROAD AND BRIDGE CROSSING LOAD LIMITS.
B. TRUCKS SHALL USE THE EXISTING GRAVEL TURN OUTS AND
STAGING AREA TO TURN AROUND AND WAIT FOR LOADING.
C. ALL TRUCKS SHALL TRANSIT TO AND FROM N. FORK
RESERVOIR AS A CONVOY WITH ADEQUATE SAFETY
PRECAUTIONS.
D. TRUCKS SHALL NOT BE OVERLOADED.
20. MAINTENANCE OF EROSION AND SEDIMENTATION CONTROL
MEASURES
A. ALL EROSION CONTROL AND SEDIMENTATION MEASURES
WILL BE INSPECTED DAILY AND AFTER SIGNIFICANT RAIN
EVENTS BY THE ON SITE ENGINEER AND THE CONTRACTOR.
THE CONTRACTOR WILL ASSURE THAT ALL INSTALLATIONS
ARE FUNCTIONING PROPERLY AT THE END OF EACH WORK
DAY. INSPECTION REQUIREMENTS, AS DESCRIBED IN NC
DEMLR'S CONSTRUCTION GENERAL PERMIT NUMBER
NCG01000, WILL BE FOLLOWED.
B. SITE, SEASONAL OR CLIMATE CONDITIONS MAY REQUIRE
INSTALLATION OF ADDITIONAL EROSION AND SEDIMENT
CONTROL MEASURES.
21. ONCE THE WORK AREA IS STABILIZED, ALL
NON -BIODEGRADABLE EROSION CONTROL MEASURES WILL BE
REMOVED AND PROPERLY DISPOSED OF BY THE CONTRACTOR.
DREDGING OPERATIONS SEQUENCE
OBTAIN EROSION AND SEDIMENTATION CONTROL PLAN
APPROVAL AND ALL OTHER APPLICABLE PERMITS.
2. NOTIFY INSPECTOR FROM DEMLR ASHEVILLE REGIONAL OFFICE
PRIOR TO DISTURBANCE.
3. POST CERTIFICATE OF APPROVAL FOR LAND DISTURBANCE AT
SITE.
4. INSTALL RAIN GAUGE AND PREPARE SELF INSPECTION AND
REPORTING FORMS AS DESCRIBED ABOVE.
5. FLAG THE WORK LIMITS AND STAKE OUT THE EXTENTS AND
ELEVATIONS OF THE PROJECT.
6. LOCATE ALL UNDERGROUND UTILITIES WITHIN THE WORKSITE.
7. HOLD PRE -CONSTRUCTION MEETING PRIOR TO STARTING
CONSTRUCTION.
8. INSTALL CONSTRUCTION ENTRANCES, SILT FENCE AND STREAM
CROSSING PER THE ATTACHED PLAN SHEETS AND DETAILS.
9. INSPECT EROSION AND SEDIMENTATION CONTROL PRACTICES
DAILY AND AFTER SIGNIFICANT RAINFALL EVENTS. MAKE
NEEDED REPAIRS IMMEDIATELY.
10. ANY AREA DISTURBED WITHIN 25 FEET FROM THE TOP OF THE
STREAM BANK SHALL BE PROVIDED WITH TEMPORARY GROUND
COVER SPECIFIED IN THE VEGETATION PLAN WITHIN 10
CALENDAR DAYS, UNLESS SUPERSEDED BY THE CONDITIONS
OF GENERAL STORMWATER PERMIT NCG 010000.
11.
DEWATERING N. FORK RESERVOIR
A. PRIOR TO STARTING DREDGING OPERATIONS, THE WATER
SURFACE ELEVATION OF THE RESERVOIR SHALL BE LOWERED
BY TEMPORARY SIPHONS OR PUMPS TO AN ELEVATION
THAT WILL ALLOW THE SEDIMENT THAT WILL BE EXCAVATED
TO DEWATER AND DRY OUT. THE WATER ELEVATION CAN
BE LOWERED BELOW THE WTP INTAKE ELEVATION (2039') TO
DEWATER SEDIMENTS TO BE REMOVED IN THE VICINITY OF
THE DAM AND BOTTOM DRAIN. TEMPORARY ROCK SILT
CHECKS AND TURBIDITY CURTAINS SHALL BE INSTALLED TO
PREVENT TURBID WATER FROM DISCHARGING
DOWNSTREAM
B. THE RESERVOIR BYBASS VALVE SHALL REMAIN CLOSED FOR
THE DURATION OF THE DEWATERING AND DREDGING
OPERATIONS.
C. THE LOWERED WATER SURFACE ELEVATION SHALL BE
MAINTAINED FOR A SUFFICIENT PERIOD OF TIME TO ALLOW
THE SEDIMENT THAT WILL BE EXCAVATED TO DEWATER AND
DRY OUT. ONCE THE SEDIMENT HAS BEEN SUFFICIENTLY
DEWATERED DREDGING OPERATIONS MAY BEGIN.
D. A FLOATING TURBIDITY CURTAIN SHALL BE INSTALLED
AROUND THE SIPHON INTAKES FOR THE DURATION OF THE
DREDGING OPERATIONS.
E. THE MINIMUM DOWNSTREAM FLOW OF 8 CFS SHALL BE
MAINTAINED THROUGH ALL PHASES OF THE PROJECT (E.G.,
DEWATERING, DREDGING, RESERVOIR REFILLING).
12. PHASE 1 DREDGE OPERATIONS
A. PHASE 1 OF THE DREDGING WORK WILL EXCAVATE AND
REMOVE SEDIMENT FROM THE BIG CREEK SIDE OF THE
RESERVOIR.
B. A TEMPORARY ACCESS RAMP TO THE WORK AREA SHALL BE
CONSTRUCTED TO MOBILIZE EQUIPMENT AND LOAD
TRUCKS. A TEMPORY CROSSING SHALL BE ESTABLISHED
ACROSS FLETCHER CREEK AS SHOWN IN THE DRAWINGS
AND DETAILS. EXISTING WOODEN FENCE SHALL BE
REMOVED DURING DREDGING AND REINSTALLED ONCE THE
PROJECT IS COMPLETE.
C. DURING ACTIVE DREDGING OPERATIONS, FLOW FROM BIG
CREEK SHALL BE DIVERTED AROUND THE WORK AREA USING
A LINED TEMPORARY CHANNEL TO PREVENT STREAM FLOW
FROM ENTRAINING SEDIMENT AND INCREASING THE
TURBIDITY AT THE SIPHON INTAKES. ANY TURBID WATER
GENERATED IN THE RESERVOIR SHALL BE ALLOWED TO
SETTLE OUT IN THE RESERVOIR OR GET PUMPED OR
DIVERTED TO THE WTP INTAKE FOR TREATMENT. TURBID
WATER SHALL NOT BE BYPASSED TO THE DOWNSTREAM
REACH.
D. AFTER THE CITY AND THE ENGINEER HAVE APPROVED THE
COMPLETED PHASE 1 DREDGING OPERATIONS ON BIG
CREEK, THE ACCESS RAMP, DIVERSION CHANNEL AND
FLETCHER CREEK CROSSING SHALL BE REMOVED.
13. PHASE 2 DREDGE OPERATIONS
A. PHASE 2 OF THE DREDGING WORK WILL EXCAVATE AND
REMOVE SEDIMENT FROM THE FLETCHER CREEK SIDE OF
THE RESERVOIR.
B. A PORTION OF THE TEMPORARY ACCESS RAMP USED FOR
PHASE 1, SHALL REMAIN IN PLACE DURING PHASE 2 TO
MOBILIZE EQUIMPENT AND LOAD TRUCKS.
C. DURING ACTIVE DREDGING OPERATIONS, FLOW FROM
FLETCHER CREEK SHALL BE DIVERTED AROUND THE WORK
AREA USING A LINED TEMPORARY CHANNEL TO PREVENT
STREAM FLOW FROM ENTRAINING SEDIMENT AND
INCREASING THE TURBIDITY AT THE SIPHON INTAKES. ANY
TURBID WATER GENERATED IN THE RESORVOIR SHALL BE
ALLOWED TO SETTLE OUT IN THE RESERVOIR OR GET
PUMPED OR DIVERTED TO THE WTP INTAKE FOR
TREATMENT. TURBID WATER SHALL NOT BE BYPASSED TO
THE DOWNSTREAM REACH.
D. AFTER THE CITY AND THE ENGINEER HAVE APPROVED THE
COMPLETED PHASE 2 DREDGING OPERATIONS ON FLETCHER
CREEK, THE ACCESS RAMP, DIVERSION CHANNEL, ROCK SILT
CHECKS, SIPHONS AND TURBIDITY CURTAINS SHALL BE
REMOVED FROM THE RESERVOIR.
14. DISPOSAL OPERATIONS AT CITY OF HENDERSONVILLE WATER
TREATMENT PLANT
A. ALL DREDGED SEDIMENT SHALL BE DISPOSED OF IN THE
DESIGNATED AREA AT THE CITY OF HENDERSONVILLE
WATER TREATMENT PLANT.
B. ALL TRUCK TRAFFIC SHALL ENTER THE SITE THROUGH THE
SERVICE GATE OFF HAYWOOD ROAD / SR 191.
C. A CONSTRUCTION ENTRANCE SHALL BE INSTALLED AT THE
ENTRANCE TO THE SERVICE YARD.
D. SILT FENCE SHALL BE INSTALLED ALONG THE LIMITS OF
DISTURBANCE.
E. PLACE ALL DREDGED MATERIAL IN THE DISPOSAL AREA TO
THE LINES, GRADES AND ELEVATIONS SHOWN IN THE
DRAWINGS.
F. AFTER THE CITY AND ENGINEER HAVE APPROVED OF THE
DISPOSAL WORK, STABILIZE THE AREA WITH TEMPORARY
SEED, PERMANENT SEED AND STRAW MULCH.
15. NOTIFY INSPECTOR FROM DEMLR REGIONAL OFFICE AFTER
FINAL STABILIZATION TO TERMINATE THE PERMIT.
NORTH FORK M
DREDGING OPERATIONS PLAN NOTES AND SPECIFICATIONS
PRELIMINARY
DRAWING
REVISIONS:
CoH: 01/28/2021
DWR: 01/19/2022
DATE: 01/19/2022
PLOT SIZE: 24" x 36"
AS NOTED
H.D.: NAD83 (SCSP)
V.D.: NAVD88
JE PID: 8102
4.1

0
40
80
Feet
SCALE: 1" = 40'
49/
W3
0.046 AC
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EXISTING CONDITIONS FEATURES
2450
TB
♦
EXISTING MAJOR CONTOUR
EXISTING MINOR CONTOUR
STREAM CENTERLINE
STREAM TOP OF BANK
TOP OF EMBANKMENT SLOPE
25' TROUT BUFFER
EXISTING GRAVEL ROAD
EXISTING WETLAND
N. FORK RESERVOIR
EXISTING SIGNIFICANT TREE
TEMPORARY BENCHMARK (TBM)
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WATERFALL
INV. ELV. = 2,453.9'
WSE ELV. @ BASE = 2,449.4'
rn
FENCE LIN
TBM #12
TBM #11
TBM #4
7
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0.007 AC
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TBM #7
12" POP
12" MAP
18" DIP
15" DIP
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_ MILLS RIVER
N.
INV. ELV. = 2,445.9'
14" OAK
TBM #9
-GRAVEL ROAD
TB
26,50
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TBM #8
26" POP.
8" BCH
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NORTH FORK M
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EXISTING SITE CONDITIONS - N. FORK RESERVOIR
PRELIMINARY
DRAWING
CoH: 01/28/2021
DWR: 01/19/2022
DATE: 01/19/2022
1" = 40'
H.D.: NAD83 (SCSP)
V.D.: NAVD88
JE PID: 8102
5.0

0
40
80
Feet
SCALE: 1" = 40'
/ V�FTcy,
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25' TROUT BUFFER
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REMOVE EXISTING WOODEN FENCE
AND 15" POPLAR TREE FOR ACCESS
TEMPORARY STREAM CROSSING.
FOUR (4) 48" HDPE CULVERTS
TURBIDITY CURTAIN SHALL BE USED
AROUND SIPHON OR PUMP INTAKES
PHASE 1 DREDGING AREA
TEMPORARY OPEN WATER IMPACT
0.338 AC
W3
PERMANENT IMPACT
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WATERFALL
INV. ELV. = 2,453.9'
WSE ELV. @ BASE = 2,449.4'
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DREDGING OPERATIONS PLAN FEATURES
- 2450 - EXISTING MAJOR CONTOUR
EXISTING MINOR CONTOUR
STREAM CENTERLINE
STREAM TOP OF BANK
TOP OF EMBANKMENT SLOPE
25' TROUT BUFFER
EXISTING GRAVEL ROAD
EXISTING WETLAND
TB
EXISTING SIGNIFICANT TREE
• TEMPORARY BENCHMARK (TBM)
LOD
WAT
SF
LIMITS OF DISTURBANCE
EROSION CONTROL WATTLES
SILT FENCE
PUMP OR SIPHON SYSTEM
■ ■ CULVERT
/ /
/
\ \ \
TRUCK LOADING RAMP
DREDGING AREA
STAGING AREA
DIVERSION CHANNEL
ROCK SILT CHECK
LIMITS OF DISTURBANCE (LOD) = 1.22 AC
EROSION CONTROL WATTLES
,/ -'/\, l /
.-2470
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TEMPORARY PUMP OR SIPHON . �- ORK IVjI
SYSTEM WITH ROCK SILT CHECK
(SEE DETAIL SHEET 3.4) TO
DEWATER RESERVOIR DURING
- DREDGING OPERATIONS
_—.2440—" —
\ 2450
BIG CREEK TEMPORARY DIVERSION CHANNEL
DURING PHASE 1 DREDGING OPERATIONS.
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NORTH FORK M
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1 DREDGING OPERATIONS PLAN - N. FORK RESERVOIR
PRELIMINARY
DRAWING
CoH: 01/28/2021
DWR: 01/19/2022
DATE: 01/19/2022
1" = 40'
H.D.: NAD83 (SCSP)
V.D.: NAVD88
JE PID: 8102
6.1
TB-

0
40
80
Feet
SCALE: 1" = 40'
�� h \�
\
\ h
\\\
25' TROUT BUFFER
W2
PERMANENT WETLAND IMPACT
0.031 AC
PHASE 2 DREDGING AREA
TEMPORARY OPEN WATER IMPACT
0.28 AC
FLETCHER CREEK TEMPORARY DIVERSION CHANNEL -
DURING PHASE 2 DREDGING OPERATIONS.
TURBIDITY CURTAIN SHALL BE USED
AROUND SIPHON OR PUMP INTAKES
—/ //// /
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DREDGING OPERATIONS PLAN FEATURES
- 2450 - EXISTING MAJOR CONTOUR
EXISTING MINOR CONTOUR
STREAM CENTERLINE
STREAM TOP OF BANK
TOP OF EMBANKMENT SLOPE
25' TROUT BUFFER
EXISTING GRAVEL ROAD
EXISTING WETLAND
TB
EXISTING SIGNIFICANT TREE
• TEMPORARY BENCHMARK (TBM)
LOD
WAT
SF
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O �'�� LIMITS OF DISTURBANCE (LOD) = 1.22 AC
/ co ( /%/
WATERFALL
INV. ELV. = 2,453.9'
WSE ELV. @ BASE = 2,449.4'
�l\ \ ti!\\
/
r —J //////i
LIMITS OF DISTURBANCE
EROSION CONTROL WATTLES
SILT FENCE
PUMP OR SIPHON SYSTEM
■ ■ CULVERT
/ /
/
\ \ \
TRUCK LOADING RAMP
DREDGING AREA
STAGING AREA
DIVERSION CHANNEL
ROCK SILT CHECK
-- -DREDGING OPERATIONS
25' TROUT BUFFER
W1
PERMANENT WETLAND IMPACT
0.007 AC
—2460
ACCESS RAMP
LIMITS OF DISTURBANCE (LOD) = 1.22 AC
EROSION CONTROL WATTLES y //\,V I (
2470
WAT
WAT
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LOD
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DEWATER RESERVOIR DURING o ,r��\ � �� �_ // / 1
(SEE DETAIL SHEET 2.4) TO
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1 DREDGING OPERATIONS PLAN - N. FORK RESERVOIR
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PRELIMINARY
DRAWING
CoH: 01/28/2021
DWR: 01/19/2022
DATE: 01/19/2022
1" = 40'
H.D.: NAD83 (SCSP)
V.D.: NAVD88
JE PID: 8102
6.2

DREDGING OPERATIONS PLAN FEATURES
- 2450 - EXISTING MAJOR CONTOUR
EXISTING MINOR CONTOUR
FILL LIMITS
TOP OF EMBANKMENT SLOPE
EXISTING GRAVEL ROAD
2450
LOD
SF
EXISTING MAJOR CONTOUR
EXISTING MINOR CONTOUR
LIMITS OF DISTURBANCE (LOD)
SILT FENCE
CONSTRUCTION ENTRANCE
INE
Ina
men I Mg
TEMPORARY SILT FENCE AROUND
PERIMETER OF WORK AREA
LIMITS OF DISTURBANCE (LOD) = 1.57 AC
HENDERSONVILLE CITY OF
PIN: 9631942484
12.35 AC
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CONSTRUCTION ENTRANCE
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NC 191
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PIN: 9631944652
0.41 AC
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SCALE: 1" = 40'
/
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TOP OF FILL
EMBANKMENT
ELV. - 2,097.0'
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GRAVEL PAD
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2095
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MLRC LLC
PIN: 9631849822
7.58 AC
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VOLUME = 7,500 CY
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HARVEY, DENISE D
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PIN: 9631944881
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FILL LIMITS
TEMPORARY SILT FENCE AROUND
PERIMETER OF WORK AREA
1
1
1
1
1
1
1
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SHOEMAKER, DAVID
PIN: 9631944991
0.34 AC
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PRELIMINARY
DRAWING
REVISIONS:
CoH: 01/28/2021
DWR: 01/19/2022
DATE: 01/19/2022
PLOT SIZE: 24" x 36"
1" = 40'
H.D.: NAD83 (SCSP)
V.D.: NAVD88
JE PID: 8102
6.3

TOP OF DAM
INV. ELV. = 2,449.2'
WTP INTAKE
INV. ELV. = 2,439.0'
(APPROX.)
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
TEMPORARY PUMP OR •
SIPHON �•
•
•
•
15" DIP WITH GATE VALVE •
INV. ELV. = 2,432.5'� •
•
N. FORK MILLS RIVER
•
•
4
4
4
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4
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9 a
J
4
4
4
4
4
4
4
44
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4
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4 44
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4
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4
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4
4
4
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4
4 4
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4
4
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4
4
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BOTTOM DRAIN BURIED
zy—
TO WTP
N. FORK RESERVOIR
WATER SURFACE
TOP OF SEDIMENT NEAR INTAKE
ELV. = 2,447.0'
IDREDGE RESERVOIR TO ELV. = 2,432.0'
CONTRACTOR SHALL NOT DREDGE ANY IN -SITU
MATERIALS BELOW ACCUMULATED SEDIMENT
DEWATERING PLAN NOTES
1. PRIOR TO STARTING DREDGING OPERATIONS, THE WATER SURFACE ELEVATION OF THE RESERVOIR SHALL BE LOWERED
SUCH THAT THE BOTTOM OF THE RESERVOIR IS NEARLY DRY WITH ONLY A SMALL RESIDUAL POOL OF WATER. THE
RESERVOIR WATER SURFACE ELEVATION SHALL NOT BE LOWERED MORE THAT 1 FOOT PER DAY SUCH THAT DISCHARGE
FROM THE SIPHON DOES NOT CAUSE EROSION TO CHANNELS DOWNSTREAM.
2. INSTALL TEMPORARY ROCK SILT CHECKS WITH STILLING BASINS AS SHOWN IN THE DRAWINGS. THE LOWERED WATER
SURFACE ELEVATION SHALL BE MAINTAINED FOR A SUFFICIENT PERIOD OF TIME TO ALLOW THE SEDIMENT THAT WILL BE
EXCAVATED TO DEWATER AND DRY OUT. ONCE THE SEDIMENT HAS BEEN SUFFICIENTLY DEWATERED DREDGING
OPERATIONS MAY BEGIN.
DEWATERING PLAN DETAIL
ROCK SILT CHECK FOR
INLET PROTECTION
WASHED #57 FILTER STONE
NCDOT CLASS B RIPRAP
WASHED #57 FILTER STONE
NCDOT CLASS B RIPRAP
ROCK SILT CHECK FOR
INTAKE PROTECTION
DETAILED PLAN
NOT TO SCALE
SETTLING
BASIN
DETAILED SECTION A - A'
NOT TO SCALE
EXISTING
EMBANKMENT
SETTLING BASIN
EXISTING
EMBANKMENT
ROCK SILT CHECK SPECIFICATIONS
1. ALL ROCK SILT CHECK INSTALLATION WORK SHALL TAKE PLACE DURING DRY WORKING CONDITIONS. THE
CONTRACTOR SHALL MINIMIZE THE EXPORT OF SEDIMENT TO ADJACENT SURFACE WATERS TO THE MAXIMUM
EXTENT PRACTICABLE.
2. INSTALL THE ROCK SILT CHECK AND ARMORED OUTFALL, ELEVATIONS AND GRADES IN THE DRAWINGS AND
DETAILS.
3. NON -WOVEN 8 OZ FILTER FABRIC SHALL BE USED BENEATH ALL RIPRAP INSTALLATIONS.
4. EROSION CONTROL BLANKET SHALL BE USED ON ALL EXCAVATED AND BACKFILLED EMBANKMENT AREAS.
ROCK SILT CHECK DETAIL
NORTH FORK M
DREDGING OPERATIONS PLAN DETAILS
PRELIMINARY
DRAWING
REVISIONS:
CoH: 01/28/2021
DWR: 01/19/2022
DATE: 01/19/2022
PLOT SIZE: 24" x 36"
1" = 40'
H.D.: NAD83 (SCSP)
V.D.: NAVD88
JE PID: 8102
6.4