20200588 Ver 1_DEQ trout buffer variance request_20200708

4PL
HEADWATERS
ENGINEERING
July 7, 2020
Mr. Stan Aiken
Land Quality Section
North Carolina Department of Environmental Quality
2090 US70 Highway
Swannanoa, NC 28778-8211
Subject: Erosion and Sedimentation Control Narrative
Trout Buffer Variance Request
Stream Restoration and Dam Construction
John Meshad Property on Norton Ridge Road
Macon County, North Carolina
Dear Mr. Aiken:
This narrative describes site conditions, transmits plans for proposed stream restoration and dam
construction, and requests a trout buffer variance for the subject project. The work is being done
in response to Notices of Violation (NOVs) from Macon County and the NC Division of Water
Resources issued in November 2019. Restoration will take place on unnamed tributaries (UTs)
to Big Norton Prong (Class WS-II; Tr; HQW). The site is located in the Little Tennessee River
basin.
Site Conditions
The project site is located on the western floodplain of Big Norton Prong where three UTs enter
the main stem creek on the east side of Norton Ridge Road. The westernmost UT was
previously impounded and the NOV relates to Mr. Meshad having started expanding the
impoundment prior to obtaining the necessary permits. Site grades within the immediate work
area are relatively flat but the pond site is surrounded by rolling terrain; elevations range from
about 3925 feet at the southern property boundary to about 3900 feet in the pond footprint.
Work was halted upon receipt of the NOV and soil stockpiles, silt fences and a flashboard riser
pond outlet structure remain in place. The northern and western boundaries of the disturbed area
are wooded.
The proposed project, detailed in the attached plans, involves the following:
• Construction of 426 LF of new, off-line stream channel on two UTs to Big Norton Prong;
• Construction of a 6-foot tall dam and creation of a 0.8-acre pond where a smaller pond
had existed prior to the NOV; and
• Planting native trees and shrubs in riparian buffer areas.
Proposed Erosion and Sedimentation Control Measures
The design attempts to minimize erosion and sedimentation through the following practices:

Erosion and Sedimentation Control Narrative
Stream Restoration and Dam Construction at Meshad Property
Page 2 of 2
• A coffer dam flow diversion, pump -around and/or diversion swale will be used to divert
stream flow around work areas and through an existing flashboard riser outlet structure;
• The contractor will be required to mobilize all equipment and materials necessary for the
project before beginning any stream work;
• Silt fences will be installed on the stream sides of all temporary stockpiles; and
• The contractor will be required to stage his work such that disturbed areas along the
stream banks will be stabilized with seeding, mulch and erosion control matting prior to
the end of each work day.
Stream restoration and dam construction will take place concurrently and will begin soon after
permits are obtained. The project is expected to last for three months, with planting to take
place during the dormant season following grading. Details on the construction sequence and
erosion and sedimentation control practices are included in the attached plan sets.
Closure
Attachments to this narrative include: a completed trout buffer waiver supplemental information
form, stream restoration plans by Headwaters Engineering, PC, and dam design plans by Garner
Engineering.
If you have any questions or need additional information, please call me at 828.606.0306.
Sincerely,
Headwaters Engineering, PC
Andrew Bick, PE
Principal
Attachments

NCDENR
North Carolina Department of Environment and Natural Resources
Division of Energy, Mineral and Land Resources
Trout Buffer Waiver
Supplemental Information
The following information should be completed and submitted with respect to the site
requiring the buffer waiver.
Project Name: Stream Restoration and Dam Construction
Owner's Name: John W. Meshad
Address: 1417 Kimlira Lane, Sarasota, FL 34231
Consultant's Name: Headwaters Engineering, PC
Address: 45 Lotus Place, Asheville, NC 28804
Stream Name: Tributaries to Norton Prong Water Class: WS-II; Tr; HQW
County: Macon
Project Purpose: Resolve NOV for unauthorized stream impacts; construct new dam
Total Acres of Land -Disturbing Activity: 1.7 (ac)
Total Acres Disturbed within buffer zone: 0.5 (ac)
Total Length of Stream on Tract 1073 (ft)
Buffer Impacts:
Buffer Width Reduction:
Vegetation Trimming:
Channel Piping:
(ft)
(ft)
(ft)
Channel Relocation: 376 (existing); 426 (proposed) (ft)
Total Length of Buffer Impact: 376 (existing); 426 (proposed) (ft)

CONSTRUCTION PLANS FOR
STREAM RESTORATION
UTs TO BIG NORTON PRONG
MACON COUNTY, NORTH CAROLI NA
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SHEETINDEX
PREPARED FOR:
1: TITLE
2: NOTES AND SYMBOLS Mr. John Meshad
3: CONSTRUCTION SEQUENCE VICINITY MAP Sarasota, FL
4-5: PLAN AND PROFILE NOT TO SCALE
6: EROSION CONTROL PLAN
7-8: TYPICAL SECTIONS
9-10: DETAILS
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1. NO STREAM WORK SHALL BEGIN UNTIL ALL MATERIALS NEEDED FOR STREAM RESTORATION ACTIVITIES ARE BROUGHT TO
THE SITE.
2. ALL EQUIPMENT SHALL BE CLEANED PRIOR TO MOBILIZATION AND SHALL BE MAINTAINED TO BE FREE OF LEAKS.
3. FUELING SHALL BE PERFORMED IN A CONTAINED AREAAT LEAST 200 FEET FROM FLOWING WATER.
4. WORK SHALL BE STAGED SUCH THAT NO MORE CREEK BANK IS DISTURBED THAN CAN BE STABILIZED WITH SEED, MULCH
AND MATTING BY THE END OF THAT WORK DAY.
3. TREES, UTILITIES AND OTHER SITE FEATURES SHALL BE PROTECTED IN PLACE UNLESS MARKED FOR REMOVAL.
4. TREES AND LOGS REMOVED DURING GRADING SHALL BE SALVAGED FOR ON -SITE USE AS IN THE PROJECT UNLESS
DIRECTED OTHERWISE. LOGS AND CLEARING DEBRIS NOT USEFUL TO THE PROJECT SHALL BE DISPOSED OFF -SITE.
5. LIVE STAKES AND BUFFER TREES AND SHRUBS SHALL BE INSTALLED DURING THE DORMANT SEASON, TYPICALLY
DECEMBER THROUGH MARCH.
6. CONSTRUCTION OF THE DAM SHALL OCCUR CONCURRENTLY WITH STREAM RESTORATION ACTIVITIES. SEE DAM PLANS BY
GARNER ENGINEERING (7/3/20) FOR SPECIFICS ON DAM DESIGN.
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NOTES AND
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SHEET 2 OF 10

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CONSTRUCTION SEQUENCE: LLJ
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GENERAL NOTES O
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1. ALL EQUIPMENT AND MATERIALS NECESSARY TO COMPLETE THE PROJECT SHALL BE MOBILIZED TO THE SITE BEFORE WORK BEGINS ON THE STREAMS. j
2. SILT FENCE SHALL BE INSTALLED ON BIG NORTON PRONG SIDE OF ALL TEMPORARY STOCKPILES. LLJ
3. A STAGED FLOW DIVERSION SHALL BE USED TO DIVERT STREAM FLOW AROUND WORK AREAS. THE DIVERSION WILL EMPLOY A COMBINATION OF A COFFERDAM, PIPE AND A PUMP -AROUND, DEPENDING V)
ON SITE CONDITIONS AND STREAM FLOW RATES ENCOUNTERED DURING CONSTRUCTION. o
4. STREAM BANKS MUST BE STABILIZED WITH SEED, MULCH AND MATTING WITHIN 24 HOURS OF REACHING FINAL GRADES. Q m c
5. ALL GRADED AREAS STEEPER THAN 3:1 MUST BE STABILIZED WITH SEED AND MULCH WITHIN 7 DAYS OF REACHING FINAL GRADES. ALL OTHER AREAS MUST BE STABILIZED WITHIN 14 DAYS OF REACHING
FINAL GRADES
6. ALL EQUIPMENT SHALL BE CLEANED PRIOR TO MOBILIZATION AND SHALL BE MAINTAINED TO BE FREE OF LEAKS.
7. FUELING SHALL BE PERFORMED IN A CONTAINED AREAAT LEAST 200 FEET FROM FLOWING WATER.+r
8. LIVE STAKES AND BIOENGINEERING PRACTICES SHALL BE INSTALLED DURING THE DORMANT SEASON, TYPICALLY DECEMBER THROUGH MARCH.
MOBILIZATION AND SITE PREPARATION �
9. MOBILIZE EQUIPMENT AND MATERIALS TO THE SITE AND LOCATE LIMITS OF DISTURBANCE. ="'
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10. INSTALL CONSTRUCTION ENTRANCE/EXITAS SHOWN ON THE PLANS. USE EXISTING GRAVEL ROAD OFF NORTON RIDGE ROAD TO ACCESS WORK AREA. y Yo
11. MONITOR HAUL ROAD FOR SOIL LOSS ON A DAILY BASIS AND MAINTAIN ROAD AND GRADE OR STABILIZE WITH STONE AS NEEDED TO PREVENT SOIL LOSS. D w,.• q.�
12. USE EXISTING CULVERT TO CROSS THE STREAMS.
STREAM RESTORATION AND DAM ROUGH GRADING
13.
REMOVE ALL FLASHBOARDS FROM EXISTING OUTLET STRUCTURE AND DRAIN EXISTING POND AS MUCH AS POSSIBLE.
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14.
CONSTRUCT COFFER DAM AND DIVERSION PIPE TO INTERCEPT STREAM FLOW AND ROUTE IT TO THE EXISTING OUTLET STRUCTURE.
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INSTALL PUMP -AROUND OR TEMPORARY DIVERSION SWALE TO CAPTURE FLOW FROM S3 AND S4 AND ROUTE IT TO THE COFFER DAM AND DIVERSION PIPE.
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16.
USE PUMP(S) TO DEWATER WORK AREAAS NEEDED AND DISCHARGE TO STABLE WOODED OR GRASS AREA BEYOND THE WORK AREA.
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17.
SCARIFY SUBGRADE IN STREAM WORK AREATO A DEPTH OF AT LEAST 6 INCHES IN ORDER TO PROMOTE BOND WITH FILL SOILS.
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18.
PLACE AND COMPACT FLOODPLAIN FILL SOILS IN LIFTS NOT EXCEEDING 10 INCHES IN THICKNESS THROUGH THE RESTORED STREAM AND FLOODPLAIN CORRIDOR. BRING COMPACTED FILL TO
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PROPOSED FLOODPLAIN GRADES. SEE GARNER PLANS FOR DAM GRADING SPECIFICATIONS.
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EXCAVATE S3 AND S4 CHANNELS PER THE PLAN AND PROFILE DRAWINGS, LEAVING SHORT SECTIONS OF BANK MATERIALS AS NEEDED TO MAINTAIN DIVERSION.
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SEED, MULCH AND PLACE MATTING OVER COMPLETED BANKS ON S3 AND S4 CHANNELS. INSTALL CONSTRUCTED RIFFLES.
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USE PUMP -AROUND TO DIVERT FLOW AROUND THE UPSTREAM ENDS OF S3 AND S4; EXCAVATE UPSTREAM ENDS OF S3 AND S4 AND TURN FLOW INTO THE NEW CHANNELS. DISMANTLE STREAM
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PUMP -AROUND OR DIVERSION SWALE
22.
AFTER THE DAM/POND CONSTRUCTION (GARNER PLANS) IS COMPLETE, REMOVE DIVERSION PIPE AND ROUTE S1 FLOW INTO THE POND.
23.
SMOOTH FLOODPLAIN BEYOND THE DAM TO DESIRED FINSHED GRADES ADJACENT TO RESTORED STREAMS.
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DEMOBILIZATION
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RIP, SEED AND MULCH HAUL ROAD AND STAGING AREAS.
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REMOVE TRASH AND DEBRIS AND RESTORE DISTURBED AREAS TO THEIR PRE -CONSTRUCTION CONDITIONS.
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26.
REMOVE CONSTRUCTION ENTRANCE/EXITAND SILT FENCE(S)
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PLANTING/BIOENGINEERING
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BARE ROOT PLANTS AND LIVE STAKES SHALL BE INSTALLED DURING THE DORMANT SEASON, GENERALLY DECEMBER THROUGH MARCH.
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DATE: JULY 2020
SCALE: AS SHOWN
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BARE EARTH LiDAR DATED 2016/2017. BUFFERS — P L
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GARNER ENG. PLANS o •.. 4�
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LAT.:35.093817; LONG.-83.189178 \
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DATE: JULY 2020
SCALE: AS SHOWN
EROSION
CONTROL PLAN
SHEET 6 OF 10

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5' MIN. BENCH
3 MIN. (TYP) 10' MIN. 4.4' 0 6' ON RIGHT BANK
APPROX. EXISTING SEED, MATTING, LIVE STAKES
POND BOTTOM =21 �2OU TYP. BOTH BANKS
FILL SOILS, COMPACTED IN LIFTS J
NOT MORE THAN 12" THICK TYPICAL SECTION
7
_j STREAM S3 -RIFFLE
FILL BEYOND BENCHES CAN BE LEFT
LOWER THAN FLOODPLAIN TO CREATE
VERNAL POOLS IF NECESSARY (TYP)
10' MIN. 6.0' 1.0' S MIN. BENCH ON RIGHT BANK
3.5 2.5 3 MIN. (TYP)
------ �1 1� 1
APPROX. EXISTING FILL BEYOND BENCHES CAN BE LEFT
POND BOTTOM SEED, MATTING, LIVE STAKES LOWER THAN FLOODPLAIN TO CREATE
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FILL SOILS, COMPACTED IN LIFTS TYP. BOTH BANKS VERNAL POOLS IF NECESSARY (TYP)
NOT MORE THAN 12" THICK
SECTION DRAWN FOR LEFT -BENDING POOL; USE 2 TYPICAL SECTION
MIRROR IMAGE FOR RIGHT -BENDING POOL 7 STREAM S3 - POOL
NOTES
LEGEND 1. TYPICAL SECTIONS DRAWN LOOKING DOWNSTREAM.
2. DISTURBED BANKS SHALL BE ROUGHENED PERPENDICULAR
EXISTING _ _ _ _ _ _ TO SLOPE, COVERED WITH 3" LAYER OF TOPSOIL, SEEDED,
PROPOSED MULCHED AND MATTED WITH 780 G/MZ COIR FIBER MATTING.
3. ADJUST GRADING LIMITS AS NEEDED TO PROTECT EXISTING
MATURE TREES NOT MARKED FOR REMOVAL.
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STREAM S3
TYPICAL
SECTIONS
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POND BOTTOM
TYP. BOTH BANKS':
FILL SOILS, COMPACTED IN LIFTS TYPICAL SECT ON `
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LEGEND 1. TYPICAL SECTIONS DRAWN LOOKING DOWNSTREAM.
2. DISTURBED BANKS SHALL BE ROUGHENED PERPENDICULAR 5
EXISTING TO SLOPE, COVERED WITH 3" LAYER OF TOPSOIL, SEEDED,
PROPOSED MULCHED AND MATTED WITH 780 G/M2 COIR FIBER MATTING.
3. ADJUST GRADING LIMITS AS NEEDED TO PROTECT EXISTING
MATURE TREES NOT MARKED FOR REMOVAL. DATE: JULY 2020
SCALE: AS SHOWN
STREAM S4
TYPICAL
SECTIONS
SHEET 8 OF 10

TOP OF BANK
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V MIN
MATTING SHALL BE
780 G/M2 COI R
REMOVE ALL DEBRIS,
SCARIFY SURFACE, PLACE
TOPSOILAND SEED/MULCH
BEFORE PLACING MATTING
STEEL T-POST
FILTER FABRIC
WITH WIRE BACKING
COMPACTED BACKFILL l I I SIDE
EK
RUNOFF
.,
24" MIN.
MATTING PLACED FLUSH WITH BANK SURFACE, LAP
OVER DOWN STREAM / DOWN SLOPE SEAMS
12" WOOD STAKE PLACED IN
3' O.C. DIAMOND PATTERN
MATTING ANCHORED 1'
BELOW STREAM BED
1 EROSION CONTROL MATTING
9 NTS
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WIRE BACKING
PROFILE
4" 111. 1 T NOTES:
1. SILT FENCE SHALL BE PLACED ON STREAM
SIDE OF ALL STOCKPILES.
SECTION 2. SILT FENCE SHALL BE REMOVED UPON
COMPLETION OF EARTHWORK.
2 SILT FENCE
i NTS
4' -
2 (TYP)
1.0
6 MIL PLASTIC SHEETING
ANCHORED TO GROUND
NOTE: MAINTAIN AT LEAST 1% FALLALONG PROFILE.
COBBLE PAD OR
WOODEN PALLET
OUTLET SHALL BE WELL
VEGETATED OR STABILIZED WITH
CLASS A STONE AS NEEDED TO
PREVENT EROSION
COFFER DAM; SAND BAGS W/
PLASTIC SHEETING
DIVERSION PUMP
SIZED FOR BASE
FLOW + 30%
FLOW
MAX DEPTH -1'
HDPE SHEETING HELD
IN PLACE ON TOP
WITH SAND BAGS
X
PROFILE
NON -WOVEN SILT BAG
II
WORK AREA*
10' MIN. FROM STREAM
SII T RAC-3
DEWATERING PUMP
AS NEEDED
TOE OF BANK (TYP)
TOP OF BANK (TYP)
VARIES
SILT BAG ON STONE PAD,
SEE DETAILABOVE
PROTECT EXIST.
BANK VEGETATION
FOR ADD'L FILTER
DISCHARGE TO
STABLE STREAM
BED AREA
*NOTE:
WORK AREA SHALL BE STABILIZED BY
THE END OF EACH WORK DAY
TOP OF BANK BANK TO BANK
STREAM BOTTOM MAX DEPTH
COFFER DAM
SECTION
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I SCALE: AS SHOWN I
3 TEMPORARY DIVERSION SWALE 4 PUMP -AROUND SCHEMATIC DETAILS
9 NTS 9 NTS
SHEET 9 OF 10

RIPARIAN SEED MIX
Seeding Rate = 20 lb/acre
Mulching: wheat or oat straw mulch applied at 2 tons/acre
Common Name
Scientific Name
Percentage
Deer Tongue
Panicum clandestinum
20
Big Bluestem
Andropogon gerardii
20
Virginia Wildrye
Elymus virginicus
20
Indiangrass
Sorghastrum nutans
20
Soft rush
Juncus effusus
20
IN. 2 NODES ABOVE GRADE
LIVE STAKE
TIN DIAMOND PATTERN
HARD SOIL OR STONE MAY
BE PRESENT SEE NOTE 1
BASEFLOW W.S.
3 NODES MIN.
SECTION
2 LIVE STAKING
10 NTS
TEMPORARY SEED MIX
Rate (lb/acre)
Rate (lb/acre) Applied
Application Dates
Common Name
Scientific Name
Applied
w/ Riparian Mix
Separately
August 15 to May 1
Rye Grain
Secale cereale
120
60
May 1 to August 15
Browntop Millet
Urochloa ramosa
40
20
18" MIN.
1 SEED MIXES AND
10 BUFFER PLANTING
TOP CUT AT 15'
AFTER
INSTALLATION
BUDS POINTED
UPWARD
1 /2" TO 2"
BASE CUT
AT 45 DEG.
LIVE STAKE DETAIL
LIVE STAKE NOTES:
1. FORM PILOT HOLE THROUGH HARD SOIL OR STONE TO
PREVENT DAMAGE TO STAKE.
2. LIVE STAKE MIX TO INCLUDE AT LEAST TWO OF THE
FOLLOWING SPECIES: SILKY DOGWOOD, SILKY WILLOW,
ELDERBERRY, NINEBARK, BUTTONBUSH.
3. LIVE STAKES SHALL BE INSTALLED DURING THE
DORMANT SEASON, GENERALLY DECEMBER THROUGH
MARCH.
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SCARIFY SUBGRADE PRIOR
TO STONE PLACEMENT
A
r
BARE ROOT TREE AND SHRUB PLANTING
MINIMUM DENSITY OF 400 STEMS/ACRE
COMMON NAME
SCIENTIFIC NAME
SPACING
(FEET)
Tulip Poplar
Liriodendron tulipifera
12-18
Sycamore
Platanus occidentalis
12-18
Tag Alder
Alnus serrulata
8-12
Ninebark
Physocarpus opulifolius
8-12
Witch -hazel
Hamamelis virginiana
8-12
Pawpaw
Asimina triloba
12-18
Bitternut Hickory
Carya cardiformis
12-18
0 I ELEVATION POINT, SEE PROFILE
MIX OF CLASS B
STONE AND
ON -SITE GRAVEL
AND COBBLE
1' (TYP)
PLAN
d
EMBED HARDWOOD BRANCHES
AND LOGS AS DIRECTED
MIX OF CLASS B STONE
AND ON -SITE GRAVELAND COBBLE
18" MIN. AFTER COMPACTION
SECTION A -A'
EMBED LOG/BRANCH
MIN. T INTO BANK
3 CONSTRUCTED RIFFLE
10 NTS
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DATE: JULY�DATE: JULY 20200
SCALE: AS SHOWN
DETAILS
SHEET 10 OF 10

NORTON RIDGE POND DAM
PROJECT INFORMATION
PROJECT OWNER:
JOHN MESHAD
941-321-5180
[e-mail]
STATE I D#: N/A
AVAILABLE CODE: DAM SAFETY ACT OF 1967
DAM SIZE CLASSIFICATION: SMALL (5 FEET HIGH)
DAM HAZARD CLASSIFICATION: EXEMPT
PROJECT LOCATION:
PROJECT ENGINEER:
GARNER ENGINEERING INC.
9 DAVIS LANE
FAIRVIEW, NC 28730
828.337.5716
[e-mail]
CONTACT: JOHN GARNER
NORTON RIDGE ROAD
MACON COUNTY
HIGHLANDS, NC
07/03/2020
NORTON RIDGE ROAD
HIGHLANDS, NC
L.• ..Rich Miay.,q iCrab
PROJECT LOCATION
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LOCATION MAP
USGS HIGHLANDS QUADRANGLE, 2019
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EMBANKMENT DAM DESIGN INFORMATION
OPERATIONS RECOMMENDATIONS
CREST ELEVATION:
3902.1 FEET
CREST WIDTH:
8 FEET
UPSTREAM SLOPE:
2H:1V
DOWNSTREAM SLOPE:
3H:1V
GENERAL FILL
SOIL TYPE:
SM, SC, ML
MAX. PARTICLE SIZE:
8 INCHES
DRY DENSITY:
85 - 110 PCF
COMPACTION:
95% DRY DENSITY - STANDARD PROCTOR
MOISTURE CONTENT:
0 +/- 3% OF OPTIMUM
EMBANKMENT CORE
SOIL TYPE: SM, SC, ML, CL
MAX. PARTICLE SIZE: 3 INCHES
DRY DENSITY: 85 - 110 PCF
COMPACTION: 95% DRY DENSITY - STANDARD PROCTOR
MOISTURE CONTENT: 0 +/- 3% OF OPTIMUM
SPILLWAY SYSTEMS
PRINCIPAL SPILLWAY: 2X24-INCH AGRI-DRAIN STANDPIPE
15-INCH (MIN) INTAKE AND DISCHARGE PIPE
EMERGENCY SPILLWAY: 10-FOOT OVERFLOW SECTION
ELEV. = 3901.7 (MAX)
WATERSHED PARAMETERS
AREA: 14 ACRES
CURVE NUMBER: 48
TIME OF CONCENTRATION: 0.33 HOUR
BASIN LAG: 0.20 HOUR
5-YEAR CALCULATED INFLOW 8.4 CFS
25-YEAR CALCULATED INFLOW 16.9 CFS
LOCAL RAINFALL DATA*
(*NOAA - PRECIPITATION FREQUENCY DATA SERVER)
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1
Average recurrence interval (years)
1 2 5 10 25 50 100 200 500 1000
72-hr
4
(3.42A.08)
4: 9-4.88
4. 25789
5.67-6.81
6.64 8?04
7. 9914
8.31-310.3
: 98-11.5
1 4- 3A
11 5- 5.1
�_hr
4.82
(4A9-521)
5.79
(5.39-6.24)
7.12
(6.62-7.68)
8.18
(7.59-8.83)
9.67
(8.90.10.4)
10.9
1 (9.98-11.7)
12.1
(11.1-13.1)
13.5
(12.2-14.6)
15.4
(13.7-16.8)
17.0
(15.0-18.6)
5.91
7.05
8.59
9.82
11.5
12.9
14.3
15.9
18.0
19.7
2-day
(5.51-6.36)
(6.58-7.61)
(8.009.26)
(9.12-10.6) 11
(10.7-12.4) 11
(11.9-13.9)
(13.1-15.5)
(14.4-17.2)
(16.2-19.7)
(17.6-21.7)
•'•F�:+'Q�M. ARNER
ENGINEERING
�iiDiy•'. t� ��`� 9 DAVIS LANE
)Iti���FAIRVIEW, NC 28730
www.garner-eng.com
07/03/2020 828.337.5716
SCALE:
DRAWN BY
AS SHOWN
JFG
PROJECT NO: GE-215
DATE: 07/03/2020
PROF. ENG. FIRM
NO. C-4451
ROUTINE OPERATIONS
• VISUALLY INSPECT EMBANKMENT (MONTHLY)
• VISUALLY INSPECT SPILLWAY OUTFALL (MONTHLY)
• VISUAL INSPECTION OF UPSTREAM WATERLINE (MONTHLY)
• REVIEW WEATHER FORECAST (ONGOING)
• EXERCISE FLASHBOARDS (ANNUALLY)
• POND DRAINING - DRAIN POND SLOWLY. RAPID DRAWDOWN CAN LEAD TO SLOPE
FAILURES
•• REMOVE ONE FLASHBOARD EVERY 24 HOURS.
STORM RESPONSE
MONITOR RAINFALL FORECASTS TO DETERMINE APPROPRIATE REPONSE
• FORECAST > 5" RAIN REMOVE ONE FLASHBOARD*
• POND AT EMERG. SPILLWAY REMOVE 2ND & 3RD FLASHBOARDS**
*BEFORE THE STORM STARTS, ONLY REMOVE ONE FLASHBOARD AT A TIME. ALLOW POND
TO LOWER FOR 24 HOURS BEFORE REMOVING THE NEXT FLASHBOARD.
**DURING STORM FLOWS, UP TO THREE FLASHBOARDS MAY BE REMOVED AT ONCE TO
QUICKLY CONTROL POND LEVELS.
MAINTENANCE RECOMMENDATIONS
• MAINTAIN LOW -GROWING VEGETATION ACROSS THE EMBANKMENT TO ALLOW FOR
EASE OF ACCESS AND VISUAL INSPECTION.
• MOW THE EMBANKMENT AT LEAST TWICE PER YEAR. REMOVE WOODY VEGETATION
BEFORE IT BECOMES WELL -ESTABLISHED. KEEP WOODY VEGETATION CLEARED FROM
EMBANKMENT EDGES.
• REMOVE DEBRIS AND VEGETATION FROM SPILLWAY INTAKES AND OUTFALLS.
• MONITOR AND MANAGE ANIMAL IMPACTS AS REQUIRED.
DESIGN PARAMETERS
NORTH RIDGE POND DAM
NORTON RIDGE ROAD
HIGHLANDS, NC
M00

CONSTRUCTION SEQUENCE:
1. ESTABLISH SEDIMENT AND EROSION CONTROL MEASURES.
2. ESTABLISH CONTROL OF SURFACE WATER BY DIVERTING ALL
FLOWS THROUGH EXISTING AGRI-DRAIN STRUCTURE. (SEE
CONTROL OF WATER NOTES, BELOW.)
3. CONCURRENT WITH STREAM RESTORATION, CONSTRUCT
PERIMETER EMBANKMENT:
3.1. FOUNDATION EXCAVATION AND PREPARATION
3.2. PLACEMENT OF CORE MATERIAL
3.3. PLACEMENT OF SHELL MATERIAL
4. DIVERT FLOWS THROUGH CONSTRUCTED STREAM CHANNEL
NORTH OF POND.
5. CONSTRUCT FLOWABLE FILL CRADLE AROUND AGRI-DRAIN
PIPING.
6. BACKFILL AGRI-DRAIN TO COMPLETE THE EMBANKMENT.
7. DIVERT SURFACE WATER FLOWS FROM STREAM S4 TO
AGRI-DRAIN. (STREAMS S3 AND S4 ARE DIVERTED TO
RESTORED STREAM CHANNEL.)
8. ESTABLISH PERMANENT GROUND COVER OVER DISTURBED
AREAS.
9. REMOVE EROSION AND SEDIMENT CONTROLS.
10. UPON PERMITTING APPROVAL, INSTALL FLASHBOARDS IN
AGRI-DRAIN TO ESTABLISH THE NEW POND.
CONTROL OF WATER NOTES:
1. EXTEND EXISTING AGRI-DRAIN PIPING UPSTREAM TOWARD
HEAD OF THE POND AND CONSTRUCT A COFFER DAM OVER
THE PIPE TO COLLECT FLOWS FROM STREAMS S1, S3, AND S4
(SEE STREAM RESTORATION PLANS BY HEADWATERS
ENGINEERING DATED 6/2/2020).
2. REMOVE ALL FLASHBOARDS FROM AGRI-DRAIN.
3. INSTALL PUMPS AND PIPING TO REMOVE EXCESS WATER
WITHIN THE WORK AREAS.
3.1. FOUNDATION EXCAVATIONS AND POND BOTTOM
EXCAVATIONS WILL REQUIRE PUMPING
4. MONITOR SURFACE WATER CONTROLS DAILY.
5. MONITOR PIPING DISCHARGE LOCATIONS FOR EROSION AND
SCOUR.
6. AFTER STREAM RESTORATION, DIVERT FLOWS FROM STREAMS
S3 AND S4 INTO NEW STREAM CHANNEL. MAINTAIN DIVERSION
OF S1 INTO AGRI-DRAIN PIPING.
7. AFTER BOTH AGRI-DRAIN SPILLWAYS ARE INSTALL AND
SECURED, REMOVE UPSTREAM PIPE EXTENSION AND COFFER
DAM.
07/03/2020
SCALE:
1. ARNER DRAWN BY
ENGINEERING PROJECTNO: IGE-215
9 DAMS LANE DATE:
FAIRVIEW, NC 28730
WWW.gaTncr-eng.com PROF. ENG. FIRM
828.337.5716 NO. C-4451
EARTHWORK CONSTRUCTION NOTES:
1. CONTRACTOR SHALL BE RESPONSIBLE FOR SITE SAFETY AND
ESTABLISHING SAFE ACCESS TO THE WORK AREA.
2. REMOVE VEGETATION IN AND AROUND THE WORK AREA.
3. REMOVE DEBRIS IN THE POND AREA OBSTRUCTING THE WORK
AREA.
4. LOWER POND LEVEL FOR 1 WEEK PRIOR TO CONSTRUCTION START.
SEE CONTROL OF WATER NOTES.
5. FOUNDATION EXCAVATION SHALL BE OBSERVED BY THE DESIGN
ENGINEER TO CONFIRM DESIGN ASSUMPTIONS.
6. FOUNDATION OVER -EXCAVATION MAY BE REQUIRED TO ACHIEVE
ADEQUATE FOUNDATION CONDITIONS FOR EARTH FILL SUPPORT
AND SEEPAGE CONTROL.
7. EARTHWORK FOUNDATIONS SHALL BE FREE OF ORGANIC DEBRIS,
SATURATED SOILS, STANDING WATER, ICE, FROZEN SOILS, AND
UNCONSOLIDATED SOILS.
8. OPEN EXCAVATIONS SHALL BE SLOPED AND/OR SHORED TO
PROVIDE SAFE ACCESS TO THE WORK AREA.
9. COMPACTED FILL TO CLASSIFY AS SM OR SC, ACCORDING TO
UNIFIED SOIL CLASSIFICATION SYSTEM.
10. COMPACT ALL BACKFILL TO 95% OF STANDARD PROCTOR MAXIMUM
DRY DENSITY.
11. PLACE FILL IN 8-INCH LIFTS AND COMPACT WITH MANUAL TAMP OR
ROLLER TO ACHIEVE COMPACTION.
12. DRAINAGE PIPING SHALL BE ADS N-12, DOUBLE -WALLED HDPE
PIPING.
13. GEOTEXTILE FABRIC SHALL BE NON -WOVEN, NEEDLE -PUNCH
FABRIC BY MIRAFI 160N OR APPROVED EQUAL.
14. NON -WOVEN GEOTEXTILE SHALL BE USED TO SEPARATE LEVELING
STONE FROM BASE SOILS AND BACKFILL SOILS.
15. STONE AGGREGATE FOR LEVELING SHALL BE NCDOT #57 STONE.
STONE SHALL NOT BE USED IN THE EMBANKMENT CORE.
16. RIP RAP SHALL BE NCDOT CLASS A. ALL OTHER STONE OR
BOULDERS SHALL BE APPROVED BY THE ENGINEER PRIOR TO USE.
17. FLOWABLE FILL
17.1. 28-DAY COMPRESSIVE STRENGTH = 100 PSI. (MIN.)
17.2. FINE AGGREGATE = ASTM C-33 SAND (50-60%, BY VOL.)
17.3. COARSE AGGREGATE = NC -DOT #78 STONE
17.4. WATER -CEMENT RATIO = 3.5:1 (MAX., BY WEIGHT)
17.5. CEMENT CONTENT = 50 LBS/CU-YD (MIN.)
18. AGRI-DRAIN LEVEL CONTROL DEVICE
18.1. INSTALL AGRI-DRAIN WITH DISCHARGE PIPING IN
ACCORDANCE WITH MANUFACTURER'S RECOMMENDATIONS
18.2. SECURE VERTICAL PLUMB AND WEIR LEVEL DURING
PLACEMENT OF FLOWABLE FILL.
18.3. ADJUST FLASHBOARDS TO ACHIEVE DESIGN WATER
SURFACE ELEVATION.
18.4. BACKFILL AROUND AGRI-DRAIN IN 6-INCH LIFTS AND
COMPACT WITH MANUAL TAMPER. AVOID DAMAGING THE
STRUCTURE.
AS SHOWN
JFG
07/03/2020
EMBANKMENT DAM DESIGN INFORMATION
CREST ELEVATION:
3902.1 FEET
CREST WIDTH:
8 FEET
UPSTREAM SLOPE:
2H:lV
DOWNSTREAM SLOPE:
3H:lV
GENERAL FILL
SOIL TYPE:
SM, SC, MIL
MAX. PARTICLE SIZE:
8 INCHES
COMPACTION:
95% DRY DENSITY - STANDARD PROCTOR
MOISTURE CONTENT:
0 +/- 3% OF OPTIMUM
EMBANKMENT CORE
SOIL TYPE:
SM, SC, ML, CL
MAX. PARTICLE SIZE:
3 INCHES
COMPACTION:
95% DRY DENSITY - STANDARD PROCTOR
MOISTURE CONTENT:
0 +/- 3% OF OPTIMUM
PRINCIPAL SPILLWAY: 24-INCH AGRI-DRAIN STANDPIPE
15-INCH (MIN) INTAKE AND DISCHARGE PIPE
EMERGENCY SPILLWAY: 10-FOOT OVERFLOW SECTION
ELEV. = 3901.7 (MAX)
EROSION CONTROL NOTES:
1. EROSION CONTROL DEVICES SHALL BE INSTALL IN
ACCORDANCE WITH THE STREAM RESTORATION PLANS
PREPARED BY HEADWATERS ENGINEERING DATED 06/02/2020.
2. PLAN ALL WORK TO LIMIT THE AREA AND TIME EXTENT OF
LAND DISTURBANCE.
3. MAINTAIN EROSION CONTROL DEVICES AROUND STOCK PILES
AND DEBRIS DISPOSAL AREAS. PROVIDE TEMPORARY COVER
OVER DISTURBED SOILS IN ADVANCE OF ANTICIPATED
STORMS.
4. PLACEMENT OF CEMENTITIOUS MATERIAL SHALL BE LIMITED
TO THE AREAS SHOWN ON THESE PLANS. ALL CONCRETE
WASHOUT MUST OCCUR OFFSITE.
NOTES
NORTH RIDGE POND DAM
NORTON RIDGE ROAD
HIGHLANDS, INC
"T
5