U.S. National Whitewater Center 5000 Whitewater Center Parkway Charlotte, NC 28214
Operational Plan for Water Treatment and Discharge
The information set forth in this plan represents the execution of the project
submitted by ClowardH20 on July 7th, 2016 for the water treatment and
draining of the whitewater system. This Operational Plan details the
process to treat the water and draining the remaining +/- 6 million gallons of
the whitewater system.
Detail Process of
The U.S. National Whitewater Center in conjunction with ClowardH2O,
CARRE INC, Edgewater Pools and Dr. Lance Riley will initiate a hyper-
chlorination of the water currently remaining in the whitewater system
(estimated at approximately +/- 6 million gallons) in the following manner:
Chlorination Process
600 gallons of Sodium Hypochlorite Solution will initially be injected at
one time into the lower pond.
This initial injection, as well as the follow on dosing injections, will
occur at 3 different locations. Injection location 1 is the competition
channel at the water’s edge (see map). Injection location 2 is in the
wilderness channel at the water’s edge (see map). Injection location
3 is at the ramp adjacent to the conveyor (see map).
All 3 injection points are inside the channels and pond and therefore
serve as an additional spill control measure.
There will be pumps located at 4 different locations circulating the
water to aid distribution of the chemicals (see map).
The circulation pumps will discharge at the surface level to minimize
disturbing the bottom of the pond yet effectively distribute the
hypochlorite. A test run of the circulation process has been
conducted on several occasions to determine the effects of the
U.S. National Whitewater Center 5000 Whitewater Center Parkway Charlotte, NC 28214
circulation process. Testing verified sound circulation with minimal
impact on turbidity or TSS.
Testing for free-chlorine levels will be conducted at the completion of
the initial injection of the 600 gallons. This testing after the initial
injection of the 600 gallons as well as the follow on dosing will occur
at 4 separate locations. Testing location 1 is on the east wall of the
pond (see map). Testing location 2 is on the west wall of the pond
(see map). Testing location 3 is on the north wall of the pond (see
map). Testing location 4 will be a random testing location designed
to capture readings at various locations. These testing locations are
situated at a considerable distance from the injection locations.
There will be a continual dosing of another approximately 600 gallons
of Sodium Hypochlorite Solution fed at approximately 0.5gpm over
the next 2 hours to maintain contact concentration of 5-10 ppm during
that period. The drain valve on the Sodium Hypochlorite IBCs will
connect to a semi-rigid hose allowing for variable discharge rates.
Rate of discharge will be based on bucket testing establishing flow
rates necessary to maintain proper levels of treatment.
Testing of free chlorine levels will take place every 15 minutes at all
four locations to assure a minimum of 5ppm is maintained.
If the testing indicates a level below 5ppm, the timing clock will reset
for another two hours after tests confirm that 5ppm was achieved (i.e.
a two hour restart).
Dechlorination Process
After the 2 hour period of >5ppm has been achieved, the water will
continue to circulate for an additional 4 hours while the chlorine
reacts and naturally depletes.
Sodium Thiosulfate will be injected at the 3 injection points and
circulated in the same manner as described before as a means of
aiding the dechlorination process.
The concentration level of the Sodium Tthiosulfate is 30% active.
The quantity of Sodium Thiosulfate will depend on several factors that
will be determined on site as a result of the testing of residual chlorine
U.S. National Whitewater Center 5000 Whitewater Center Parkway Charlotte, NC 28214
levels. It is anticipated that the sunlight (UV), heat and aeration will
result in significant reduction of the residual chlorine levels.
The Sodium Thiosulfate will only be used in an amount necessary to
eliminate the Chlorine residuals. The ratio of Thiosulfate required is
anticipated to be: 1.1ppm Chlorine =31.48 gallons of Thiosulfate (at
30% active product). This will be confirmed through testing and
adjusted as necessary.
Testing of Chlorine residuals will be conducted at the same 4 testing
locations as well as the two discharge points to verify that the chlorine
levels are 0ppm prior to discharge.
Discharge Process
The water will be discharged at 2 different locations outside the Lake
Wylie full pond elevation level of 569.4. Both locations involve a
surface discharge through a vegetated buffer and series of check-
dams designed specifically for this process. These discharge points
have routinely handled these flow rates on a regular basis without
experiencing erosion or scouring issues.
Discharge Location 1 is the main drain at the bottom of the pond.
This drain is gravity fed through a 18 inch pipe that daylights at the
base of the pond on the north side. Flow rates can be controlled by
the valve located in the overflow drain and maximum flow is
estimated at 5,000gpm (the proposed flow rate is 3,000 but can be
reduced or increased as needed). The water crosses a large
vegetated basin before flowing over a check-dam and then continuing
across vegetated buffer and check-dams and settling into a marsh
that drains into Long Creek.
Discharge Location 2 is through the level spreader located north of
the competition channel. This discharge is accomplished through a
pump and piping system that leads into the storm-water system
where it is gravity fed through the level spreader. The flow rate is
managed at the pump which will not exceed 24 hertz which results in
a maximum flow rate of approximately 1400gpm. Upon exiting the
level spreader, the water crosses a large vegetated basin before
U.S. National Whitewater Center 5000 Whitewater Center Parkway Charlotte, NC 28214
flowing across a vegetated buffer and series of check-dams before
entering a small stream that eventually drains into Long Creek.
Discharge Location 2 level spreader is designed to accept a flow rate
of 3000gpm and the maximum flow from the pump providing this
discharge will be set at 1400gpm.
Both discharge locations have controls which allow monitoring
personnel to scale back flow rates as deemed advisable during the
discharge process
Summary of planned maximum flow rates of discharge:
o Discharge location 1= 3000gpm
o Discharge location 2= 1400gpm
o Total discharge for both locations= 4400gpm
o Once again, the rates can be adjusted as necessary
A JDC Flowatch Flowmeter will be used to measure flow rates at both
locations.
The filtration units will not be used during the discharge process. All
aspects of the filtration and associated piping are currently being
cleaned and disinfected as a separate process prior to this discharge.
Discharge Monitoring
Discharge Location 2 will be monitored using an Online YSI 6820-V2
Sonde unit provided and monitored by Mecklenburg County LUESA.
Dr Riley, Mike Phillips and Perry Keester will also test at various
points associated with Discharge Locations 1 and 2 utilizing handheld
testing units measuring:
o Dissolved oxygen
o Free and combined chlorine
o Conductivity
o Salinity
o TDS
o Turbidity
o pH
o Temperature
U.S. National Whitewater Center 5000 Whitewater Center Parkway Charlotte, NC 28214
All testing before and during discharge will be recorded in a log that
will be maintained by the USNWC in the project manual (see log).
Testing equipment utilized before and during discharge will include:
o Online YSI 6820-V2 Sonde(supplied and monitored by
Mecklenburg LUESA)- optical oxygen, optical turbidity,
conductivity/temp and pH
o Lamotte Smart3 Colorimeter- free & combined chlorine and
turbidity
o Oakton PCS Testr 35- pH, conductivity, TDS, salinity and temp.
o Oakton WP SaltTestr 11- conductivity, TDS, salinity and temp
o Myron L Ultrapen PT5- dissolved oxygen
Schedule
The treatment and discharge will begin as soon as final
comments from the Mecklenburg County Department of Health
are received and implemented. It is assumed that all other
governmental agencies who are also involved inthereview
process will coordinate through the Health Department.
Given the need to start this process as quickly as possible due
to the concerns related to the potential for deterioration of the
water quality in the pond the process will begin the first morning
after greenlighted by Mecklenburg County.
Two dry runs practicing the process have already occurred.
LUESA has also placed the online YSI unit in its location.
The treatment process will start at approximately 5:30 am and
the Sodium Hypochlorite injection should take no more than 2.5
hours.
The dechlorination process is expected to take approximately 5
hours.
Immediately upon confirming the dechlorination is successful,
the discharge process will begin. This would be estimated to
occur less than 8 hours after the beginning of the treatment
process. Accordingly, draining should begin around 1:30 pm.
U.S. National Whitewater Center 5000 Whitewater Center Parkway Charlotte, NC 28214
The draining process is estimated to take 24 hours. This is
based on the following calculation:
o Discharge location 1- Assumed discharge rate- 3000gpm
= 4,320,000 per day.
o Discharge location 2- Assumed discharge rate-1400gpm
=2,0016,000.
Accordingly, the discharge can be accomplished in a 24 hour
period.
It is recommended that the discharge occur as quickly as
possible in order to minimize degradation of water quality while
maintaining the necessary monitoring and assuring no erosion
or other negative downstream effects.
Both discharge points have experienced these discharge levels
on numerous and repetitive occasions over the last 10 years
during the previous routine discharges. The discharge
locations were designed and maintained for the very purpose of
handling these discharge volumes.
Personnel Involved:
Allen Clawson PE- ClowardH20. Project Director- Plan development.
Perry Keester- Carre Inc. Project Manager. Plan development, on-
sight supervision, implementation, and monitoring.
Dr. Lance Riley PhD- Paradox Energy Biosystems.- Project
Supervisor. Plan development, on-sight supervision, implementation,
and monitoring.
Mike Phillips- Edgewater Pools.- On-sight supervision,
implementation, and monitoring.
Keenan Clark- USNWC- Wastewater Class B License and 30 years
as a Water Treatment Pump Station Operator with Charlotte
Mecklenburg Utilities Department- Implementation, and monitoring.
Alex Cooley- USNWC- Licensed commercial pesticide applicator-
Implementation and monitoring.
Jacob Littrell- USNWC- On-sight supervision, implementation, and
monitoring.
U.S. National Whitewater Center 5000 Whitewater Center Parkway Charlotte, NC 28214
Xan Deaton- USNWC- On-sight supervision, implementation, and
monitoring.
Mike Kafsky- USNWC- Safety Officer.
All personnel involved have been selected due to their considerable
previous experience in the handling of chemicals and flow systems
and processes. In addition to their previous experience and training,
the entire team has been provided with the safety plan for the project
which among other things includes the SDS sheets and handling
guides for the chemicals involved. The entire team has met on
multiple occasions to conduct “dry runs” of the processes and
procedures. Personnel utilizing the testing devices have previous
experience utilizing the devices and have been tested on their
proficiency with the devices.
Storage and Movement of Chemicals
Chemicals will be received onsite and will be stored in a dedicated
location providing secondary containment thus reducing and
eliminating the chances of the chemicals entering the soil and or
storm water drainage.
Great care will be made when moving materials so as to reduce the
risk of dropping loads and damaging vessels. All loads will be
secured prior to lifting and will be moved with a spotter observing the
load and certified fork lift operator.
All containers will be stored in the upper pond for temporary storage
and along the ramps of the lower pond during the process. This will
allow any potential leak to be contained within the concrete ponding
areas of the whitewater channels. This method works only for
chemicals that will not adversely react to concrete surfaces and in
that case would require a separate more suitable containment
system.
Site Security:
U.S. National Whitewater Center 5000 Whitewater Center Parkway Charlotte, NC 28214
The immediate dosing site will be secured to a proper distance based
on each site but with a minimum of 50 feet.
The dosing will take place prior to the opening of activities and dosing
of Sodium Hypochlorite should be concluded prior to 7:30 am.
A team member not directly involved in the processes will supervise,
observe, and maintain communication with the executing team in
order to provide a dedicated eye on safety and security.
Personal Protective Equipment
Per the SDS sheets and the standards shared in the Operators
Chlorine Handbook, the following will be the required Personal
Protective Equipment.
o Eyes – Full coverage chemical goggles will be provided.
o Face – Face shield will be provided but does not negate the
use of goggles.
o Clothing – Protective rubber pants and long sleeve rain wear
will be provided.
o Hands – Long chemical gloves that can be secured to the wrist
with rubber bands and or tape
o Feet – Rubber boots will be provided.
Disposal of Waste:
Upon completion of the use of chemicals, empty containers will be
crushed and disposed of in a method suggested by the manufacturer.
Containers will be reused and or recycled based upon manufacturer
recommendations.
Remaining chemical may be returned to the manufacturer or stored
as specified in the SDS for future usage.
U.S. National Whitewater Center 5000 Whitewater Center Parkway Charlotte, NC 28214
Attachments
Attachment 1– Injection location and circulation pump map
Attachment 2- Monitoring/Testing location map
Attachment 3 Discharge Locations image
Attachment 4-Test log
0 0.035 0.070.0175 Miles
This map or report is prepared for the inventory of real property within Mecklenburg County and is compiled from recorded deeds, plats, tax maps, surveys, planimetric maps, and other public records and data.
Users of this map or report are hereby notified that the aforementioned public primary information sources should be consulted for verification. Mecklenburg County and its mapping contractors assume no legal
responsibility for the information contained herein.
Discharge Location 1
DL1
Discharge Location 2
DL2
Date
Sample Time Free Total TDS pH Turbidity DO Operator CommentsID Military Cl2 Cl2 MG/L STD FTU
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Discharge
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Discharge
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Discharge
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Discharge
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Discharge
US National Whitewater Center Testing Log