NCG020923_Bayview Sand Mine OandM Plan_20171208

OPERATION AND MAINTENANCE PLAN
SAND MINE DEWATERING AND WATER LEVEL CONTROL STRUCTURE
Operator: HOM Development, LLC, 1002 Driftwood Drive, Manteo, NC 27954
Job Location: Bayview Sand Mine, S. Bayview Road, Powells Point, NC 27966
County: Currituck County
Prepared by: Ken Elliott, consulting
Date: December 4, 2017
This plan defines responsibilities for operating, inspecting, and maintaining equipment and structures
used for constructing and dewatering the Bayview Sand Mine safely, and that dewatering will not
degrade or negatively impact any wetlands or waters of the state.
Description and Operation of the Bayview Sand Mine:
The Bayview Sand Mine is a proposed 5.04 -acre sand mine excavation operated by HOM Development,
LLC, Jamie Basnight Hatchell, operator, in a 22.63 -acre permit area located off S. Bayview Road, Powells
Point, NC, in Currituck County. The permit area is on high sandy land and is currently a cultivated farm
field owned by Atlantic OBX, Inc. At this time HOM Development is applying for a mining permit with
the NCDEQ Division of Energy, Mineral and Land Resources to construct the sand mine and begin
operation in January 2018. HOM Development is also applying for a Use Permit from the Currituck
County Planning Department for construction of this mine.
Sand Mine Dewatering:
It will be necessary to dewater the excavation as it is being excavated to allow the excavating equipment
to enter the excavated area and safely and efficiently remove the sand from the pond bottom. This will
allow for full depth excavation and proper reclamation of the edges of the pond. It is the intention of
HOM Development to only dewater the excavations as needed, which will not entail full-time
dewatering.
For excavation purposes, dewatering will occur roughly every 30 days which will allow excavating
equipment to remove approximately 150 loads of sand up to ground level where it will be stockpiled for
later use. When the stockpile is depleted from usage, the excavation area will again be dewatered, and
another quantity of sand will be excavated.
The operator plans to construct a 0.50 -acre above -ground sedimentation pond located 30 feet north
main excavation area. The 6 -ft tall berm around the pond will have exterior 3:1 slopes with full
groundcover installed, and interior 2:1 slopes. Excavation of the main 5.04 -acre pond will begin
approximately 30 feet from the sediment pond. The edge of the sediment pond excavation and main
excavation will be 75 feet from the nearest wetland swamp. Use of the sediment pond will forcibly
hydrate the nearby wetlands located west of the sediment pond and excavation, and will minimize
dehydration of the swampy land.

The operator will install an 8 -inch dewatering pump between the 2 ponds at the north end of the main
excavation. Discharge from the dewatering pump will enter the sediment pond on its northeast end,
and there will be a constructed water height control device (see attached diagram) discharge point
located on the west end of the sediment pond. The discharge point will release clear water to a 25 -foot -
long riprap-protected ditch, leading 25 feet to an existing field irrigation and drainage ditch (non -blue -
line stream), then 0.25 miles by ditch to the Betsy's Creek wetlands and swamp, then 0.3 mile to
Currituck Sound.
Water will be pumped from the main pond to the sediment pond by the Bin gasoline -powered transfer
pump operating at idle speed. Estimated maximum flow from the pump will be 2,000 gallons/hour,
operating 12 hours per day, 0.024 mgd. It is the intention of the operator to drop the water level in the
main pond approximately 20 - 25 feet below normal ground level when needed.
The overflow from the sediment pond will be controlled by a water height control device constructed in
the northeast corner of the sediment pond. This control structure will allow water to flow through the
baffle into a 25ft long x 15" wide buried PVC pipe leading northeast 25 feet to a 6ft wide drainage ditch
running north and east through a field drainage ditch, then to Currituck Sound. For erosion control, the
overflow water will exit the water height control discharge pipe onto a 20ft long riprap-lined apron in
the ditch.
Time and distance will allow all sedimentation to occur to acceptable levels before the overflow water
reaches outfall and then the waters of the State. Water will have to travel a minimum of 270 feet to
reach the overflow point which will give enough surface area to allow sufficient sedimentation to occur.
There will be a minimum 1.5 feet of freeboard between the water surface in the sediment pond and the
top of the sediment pond bank. Stormwater drainage will be unable to enter the sediment area and
damage the sediment pond rates, due to the height of the surrounding sediment pond berm.
Sedimentation and Erosion Control
There is wetland swamp north and east of the proposed excavation, located 75 feet from the excavation
edge, running parallel to the north and east permit area boundary. The operator will establish a 50 -ft
wide undisturbed buffer (no disturbance of any kind) as a visual screen of existing woodland which is
part of the Currituck County required property line setback. This buffer will be adjacent to, and inside
of, the permit boundary. This buffer will be maintained by the operator as grass and pine tree ground
cover.
In addition, there will be a 25ft unexcavated buffer (may contain roadways, stockpiles, and sediment &
erosion control devices) around the entire excavation area, between the excavation and the
undisturbed buffer.
Sediment pond overflow will drain into an operator -maintained 6ft wide feeder ditch that leads 25 feet
to a field irrigation and drainage ditch, then 0.25 miles to the Pasquotank River. Overflow into the

feeder ditch will be stabilized by riprap installed in the feeder ditch at the overflow (see diagram) to
prevent erosion of the ditch.
All erosion and sedimentation will remain inside of the permit area. The operator will construct and
maintain an 10ft wide x 2ft tall grass -covered sand berm around the perimeter of the current affected
area of the excavation during all phases of operation. During mining operations and dewatering, most
of the water leaving the excavation will remain inside of the permit area and will only overflow through
the sediment pond occasionally. The sediment pond will be approximately 5 feet deep, and there is a
sand layer below the bottom of the area. The porosity of the soil under the sediment pond will allow
most of the water pumped into the pond from dewatering to seep back into the ground naturally. Any
excess water overflowing from the sediment pond will flow downstream 0.5 miles to Betsy's Creek and
Currituck Sound.
Maintaining the Sediment Pond Overflow Control Structure, Settlement Pond and Ditches
Inspections and maintenance are required to obtain the intended function of safely dewatering the sand
mine, and to maintain the life of any adjacent wetlands or waters of the State. Items to inspect and
maintain during the anticipated 10 -year life of the mine dewatering permit are:
• Inspect the water control structures regularly, especially following heavy rains and runoff, or
during periods of operation of the structure.
• Remove accumulated debris from the overflow control structure.
• Inspect the structure for excessive settlement or seepage.
• Inspect all components of the structure, including appurtenances, and repair or replace any
damaged items as needed.
• Inspect embankments, berms and appurtenant structures, and repair as needed.
• Repair any damage to vegetated areas or berms with compacted earth fill, reshaping, sodding,
reseeding and mulching as needed.
• Inspect riprap outlet stabilization structures in ditches regularly, replace dislodged rock as
necessary.
• Promptly repair all leaks in delivery facilities by replacing valves, fittings, gaskets, and worn or
damaged parts.
• Maintain all screens, filters, valves, timers and other electrical and mechanical equipment in
good operating condition, following manufacturer's recommendations
Monitoring the Process and Effects of Dewatering
Analytical and qualitative monitoring of mine dewatering wastewater will be in accordance with the
NCG020000 permit, as follows:
• All ponds in the Bayview Sand Mine permit area will be inspected daily by the operator to
identify any abnormal conditions.

• All berms and erosion control and sedimentation control structures will be inspected for
damages monthly and within 24 hours after every storm event greater than 1.5 inches, and all
structures will be repaired immediately.
• Special inspections will be conducted immediately following severe storms, vandalism, and
other significant events.
• Dewatering process will be inspected daily during periods of dewatering the excavation.
• Overflow of wastewater process will be inspected daily during periods of dewatering the
excavation.
• Outflow of dewatering wastewater will be monitored quarterly at the overflow exit stabilization
structure for pH, settleable solids, turbidity, and total flow. Samples will be collected and testec
onsite for pH, and the remainder will be tested for the remaining parameters by a North
Carolina certified lab.
• Rain gauge data will be collected by monitoring rain gauge data monthly and after each rain
event.
Records
Data will be collected as follows:
• Data will be collected from samples taken from the'wastewater point source discharge in
operation at the time.
• Point source discharge data: data from the site taken quarterly, date & time, general weather
conditions, pH of sample, status of process at point source, inlet or outlet, other DWQ required
data.
• Visual monitoring of adjacent wetlands and farmland for potential dehydration during mining or
dewatering activities will take place weekly. Solutions to any degradation caused by any mining
activity will include alteration of dewatering process. DWQ will be consulted as needed;
alterations to process will be recorded.
• Elliott Consulting will maintain the following records in a permanent file at the Elliott Consulting
office at PO Box 112, 202 Elliott Road, Aydlett, NC 27916: a record of all significant actions
taken; as -built drawings; permits; analytical results from sampling; and related material. Copies
of all inspections, monitoring reports and lab analyses shall be provided to NCDWQ on a regular
basis and as requested.
BMP Conditions
• The permittee will utilize best management practices to ensure that dewatering the Bayview
Sand Mine will not degrade or negatively impact any wetlands or waters of the State. BMP's will
include:
o Sediment pond outlet structure with flashboard riser located at edge of pond for ease of
maintenance.

o All berms and erosion control and sedimentation control structures will be inspected for
damages monthly and within 24 hours after every storm event greater than 1.5 inches,
and all structures will be repaired immediately.
o Sediment pond outlet ditch will have rock lining or riprap stone layer to prevent erosion,
scour or sloughing of embankment
• The permittee shall obtain authorization from the Director of the NCDEMLR and the Stormwater
Program chief prior to utilizing any chemical flocculants at Robert White Sand Mine.
Signed,
Ken Elliott
for Bayview Sand Company, LLC, Jamie Basnight Hatchell, Manager
December 4, 2017

ABOVEGROUND, 36'W x 6'T,
SEDIMENT POND CONSTRUCTION DETAIL
BAYVIEW SAND MINE
POWELLS POINT, NC
CURRITUCK COUNTY HALF -PIPE FLASH BOARD RISER
WATER HEIGHT CONTROL
DEVICE
—NORMAL WATER LE—VEL-4 5' DEPTH
-----------r--
SAND BERM SAND BERM WITH GRASS COVER b' \ A 5, I I� WITH GRASS COVER`
INTERIOR POND DIMENSIONS•
t�
105' X 355' 1
0 50 ACRES r 2
DIAGRAM BY ELLIOTT CONSULTING
NOV 3, 2017
N.T S.
NORMAL GROUND LEVEL

Discharge Outfall Outlet Protection: Construction Details
Practice Standards and Specifications 6.41, 6.31, 6.15
Bayview Sand Mine
Powells Point, NC
Currituck County
6.41 Outlet Stabilization Structure
6.31 Riprap and Paved Channels
6.15 Riprap
Pipe Outlet to Well-defined
Channel
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Trapezoidal Riprap Channel
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w Design depth :
Filter lay=er, gravel
or fabric
Riprap lined apron located at end of mine dewatering overflow pipes (3) to prevent scour and
undermining in existing ditch, and to absorb the impact of the water flow and reduce the velocity to
non-erosive levels, before flow reaches wetlands.
Riprap Apron Size: Overflow pipe discharges directly into well-defined channel. The apron will extend
across the channel bottom and up the channel banks to the top of the bank. Length of apron will be 20 -
feet downstream to maintain velocity control of maximum 2.0 feet per second.
Grade: Apron will have zero grade and no overfill at end of apron.
Alignment: Apron will be straight throughout entire length if possible. If curve is necessary to align the
apron with the receiving channel, the curve will be located in the upstream section of the riprap.
Materials: Riprap will consist of a well graded mixture of NCDOT Class A (2" to 6") stone or slag.
Thickness: Minimum thickness of rlprap will be 1.5 times the maximum stone diameter.

Filter: Operator plans to install a layer of heavy duty silt fence filter cloth between the riprap and the
underlying soil to prevent soil movement into or through the riprap. Filter cloth will extend to the top of
both channel banks, and edges will overlap 12 inches. Upstream end will be buried 12 inches and
downstream end will be buried if necessary.
Maintenance: inspect riprap outlet structures weekly and after significant rainfall events to see if any
erosion around or below the riprap has taken place, or if stones have become dislodged. Repair all
damage immediately. Maintain all vegetation adjacent to the channel in healthy condition to prevent
scour or erosion during out -of -bank flow. Control weeds and brush growing in the riprap by cutting.
Ken Elliott, consulting
December 3, 2017

Water Height Control: Construction Details
Half -pipe Water Level Control with Flash Board Risers
MRCS Code 587
Bayview Sand Mine
Powells Point, NC
Currituck County
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DESCRIPTION
A structure in a water management system that conveys water, controls the direction or rate of flow, maintains a desired
water surface elevation or measures water Water height control structure is standard structure used by agricultural and
horticultural farms in North Carolina to raise or lower water height in ditches and ponds per need (NRCS) Water height
control structure to be installed in the north berm of the sedimentation pond at the Bayview Sand Mine Overflow to be
directed down stabilized ditch to nearby Betsy's Creek, eventual outflow to Currituck Sound.

PURPOSE
To convey water from one elevation to a lower elevation within, to, or from a water conveyance system, such as a ditch,
channel, canal, or pipeline designed to operate under open channel conditions Typical structures drops, chutes,
turnouts, surface water inlets, head gates, pump boxes, and stilling basins (NRCS) This water management system will
be used to maintain a maximum water surface elevation In the sedimentation pond at the Bayview Sand Mine
Sedimentation pond is a part of the dewatering management system of the Bayview Sand Mine, used to remove
settleable matter and turbidity from mine dewatering wastewater.
CONSTRUCTION
Structure consists of 26' x 3' horizontal galvanized steel culvert running under the sedimentation pond berm A vertical 6'
half pipe 52" x 30" is attached on the north end of the culvert with stacked flash boards allowing adjustable height of the
water level in the sedimentation pond. Water flows over the flash boards and into the discharge pipe and down the rip -rap
stabilized ditch
Overflow ditch is lined with riprap for 20 feet down its length Existing slopes adjacent to the culvert are heavily grassed
with natural grass and weeds with no erosion present.
MAINTENANCE
Structures will be checked and necessary maintenance, including removal of debris, shall be performed after mayor
storms and at least semi-annually.
! t
Ken Elliott, consulting
December 3

Berm Construction Details
Bayview Sand Mine
Powells Point, NC
Currituck County
Narrow -based berm
The narrow -based berm is the most common berm having a top of 2 feet (0.6 m) and side slopes of two
horizontal: 1 vertical. This berm is the most economical to build as it requires the least material. The
steep side slopes of this type of berm eliminate the possibility of working on it with farm machinery.
i f
NEW BERM EXfSTtNG
GRADE
Berm Construction
The berm construction comprises of the scraping back of the topsoil from the area where the berm and
storage basin is to be built. A subsoil material, free of stones, rubble, stumps etc. and with at least 10%
clay should be used to construct the berm. The material for the berm may be obtained from the area
behind or in front of the berm location or moved from a borrow pit located elsewhere on the farm. An
earth mover will be required to move material from a pit located a distance away while a bulldozer
would be used if material is located in the berm area.
The berm material is to be placed in layers and compacted as each layer is added. After the berm has a
final shape the sides of the berm should also be compacted.
Emergency Overflow
To provide for larger -than designed peak flows, an overflow system is used, namely:
• "The level -top vegetated berm crest" which provides for very flat berm top so that the water will
overflow along the berm length in a thin layer so as not to create erosion problems.
Ken Elliott, consulting
December 3, 2017

Sediment Pond Sand Berm with Overflow Rock Baffle / Weir
Practice Standards and Specifications 6.87 — Check Dam with Weir
Bayview Sand Mine
Powells Point, NC
Currituck County
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Definition: Small stone dam structure with a weir outlet with sediment storage area on the upper side, installed in sand
berm.
Purpose: To reduce erosion in overflow drainage outlet during major rainstorms by reducing velocity of flow, and
provide sediment control.
Siting: To be placed at lower end of sand mine disturbed area perimeter berm (Sft x 3ft sand berm).
Aggregate Size: NC DOT Class B stone lined with NC DOT #5 or #57 stone on upper side.
Construction Specifications: Keep center stone section 6 inches below top of sand berm. Place sediment control stone
minimum 1ft thick on upstream side of berm at weir. Provide 9ft long stone apron on lower side of berm to flush with
surrounding grade.
Maintenance: Inspect check dams weekly and after significant rainfall and repair immediately if needed. Clean out
limbs, sediment and other debris that could clog the weir. Add stones to check dam to maintain correct height.
Maintain vegetative ground cover on berm, repair berm erosion as needed.
Ken Elliott, consulting
December 3, 2017

Temporary Stream Crossing Construction Details:
Practice Standards and Specifications 6.70
Bayview Sand Mine
Powells Point, NC
Currituck County
5tre— ch -m
Definition and purpose: A temporary structure installed across a stream or watercourse for short-term
use by construction vehicles or heavy equipment. Its purpose is to provide a means for vehicles to cross
streams without moving sediment into streams, damaging the streambed, or causing flooding.
Design considerations: 12ft wide sand access road through pocosin wetlands at Eure Sand Mine will
have single culvert installed every 200 feet to provide positive continuity of water flow through
wetlands. Bottom of culvert will be installed minimum 20% below natural roadbed height. Remainder
of access road will remain at natural ground level for sheet -flow overflow of rainfall.
Maintenance: Inspect stream crossings periodically and after major storms to check for channel
blockage, erosion of abutments, channel degradation, riprap displacement, slope failure, and piping.
Make all needed repairs immediately to prevent further damage to the installation,
Ken Elliott, consulting
December 3, 2017

Temporary Gravel Construction Entrance / Exit Details
Practice Standards and Specifications 6.06
Bayview Sand Mine
Powells Point, NC
Currituck County
Figure 6,06a Grave enfrancPlexa keeps sediment from teav ng the construohon site (modified from Va VIM)
Graveled pad located at entrance to access roads at Bayview Sand Mine, where traffic moves directly
onto SR 1118 S. Bayview Road.
Thickness: 6 inches minimum
Width: 15 -feet
Length: 50 -feet minimum per diagram above.
Aggregate Size: 2 — 3 inch coarse slag
Maintenance: Maintain the gravel pad to prevent mud or sediment from leaving the construction site.
Periodic top dressing with 2 -inch stone will occur as needed during the life of the permit. After rainfalls,
immediately remove all objectionable materials spilled, washed, or tracked onto public roadways.
f -
Ken Elliott, consulting
December 3, 2017

Sediment Fence (Silt Fence) Construction Details:
Practice Standards and Specifications 6.62
Bayview Sand Mine
Powells Point, NC
Currituck County
A temporary permeable barrier erected on small disturbed areas to capture sediment from sheet flow. It is made of
filter fabric buried at the bottom, stretched and supported by steel posts.
Planning: Silt fence will be installed along the perimeter of a 15ft wide access road when crossing a blue -line stream.
Crossing is existing with 24 -in cement culvert. Narrow width of fenced area will allow only shallow pools to form behind
fence while promoting deposition of sediment and preventing sedimentation into adjacent wetlands. Ends of fence will
be curled uphill in "j" pattern to prevent end flow. Stabilized outlets will be provided to protect the fence system and
release storm flow that exceeds the design.
Design considerations: Silt fence will be constructed of extra -strength synthetic filter fabric. Height of fence will not
exceed 2 feet above natural ground level, and will be constructed from a continuous roll to minimize joints. All points
will be fastened at a support post with 4 feet minimum of overlap. Extra -strength filter fabric will be fastened to road
side of steel posts (installed 2 feet deep) every 6 feet (every 8 feet if using standard strength filter fabric with wire mesh
backing) and fastened with wire ties. Trench will be excavated along inside of fence approximately 4 inches wide by 8
inches deep, into which 12 inches of fabric will be placed along the bottom and side of the trench. Trench will be
backfilled and compacted.
Maintenance: Inspect sediment fence every week and after each rainfall. Make any required repairs immediately.
Replace any collapsed, damaged, or decomposed fence promptly. Remove all fencing materials and unstable sediment
deposits and bring the area to grade and stabilize it after the contributing drainage area has been properly stabilized.
v
Ken Elliott, consulting
December 3, 2017
I, IT
A temporary permeable barrier erected on small disturbed areas to capture sediment from sheet flow. It is made of
filter fabric buried at the bottom, stretched and supported by steel posts.
Planning: Silt fence will be installed along the perimeter of a 15ft wide access road when crossing a blue -line stream.
Crossing is existing with 24 -in cement culvert. Narrow width of fenced area will allow only shallow pools to form behind
fence while promoting deposition of sediment and preventing sedimentation into adjacent wetlands. Ends of fence will
be curled uphill in "j" pattern to prevent end flow. Stabilized outlets will be provided to protect the fence system and
release storm flow that exceeds the design.
Design considerations: Silt fence will be constructed of extra -strength synthetic filter fabric. Height of fence will not
exceed 2 feet above natural ground level, and will be constructed from a continuous roll to minimize joints. All points
will be fastened at a support post with 4 feet minimum of overlap. Extra -strength filter fabric will be fastened to road
side of steel posts (installed 2 feet deep) every 6 feet (every 8 feet if using standard strength filter fabric with wire mesh
backing) and fastened with wire ties. Trench will be excavated along inside of fence approximately 4 inches wide by 8
inches deep, into which 12 inches of fabric will be placed along the bottom and side of the trench. Trench will be
backfilled and compacted.
Maintenance: Inspect sediment fence every week and after each rainfall. Make any required repairs immediately.
Replace any collapsed, damaged, or decomposed fence promptly. Remove all fencing materials and unstable sediment
deposits and bring the area to grade and stabilize it after the contributing drainage area has been properly stabilized.
v
Ken Elliott, consulting
December 3, 2017