operational plan for water treatment and dischargeftpcontent4.worldnow.com/wbtv/pdf/operational...

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

http://usnwc.org/


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


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


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


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.


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.


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:


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.


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

SP1

SP2

SP3

Discharge

SP1

SP2

SP3

Discharge

SP1

SP2

SP3

Discharge

SP1

SP2

SP3

Discharge

SP1

SP2

SP3

Discharge

SP1

SP2

SP3

Discharge

SP1

SP2

SP3

Discharge

SP1

SP2

SP3

Discharge

US National Whitewater Center Testing Log

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