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City of Columbus’ Water Storage Tanks:
Tank Maintenance and Engineering Controls that
Improved Water Quality
Ronald Christian: Plant Maintenance Supervisor I
Michele Gilkerson: Water Research Analyst II
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• Legged tanks constructed in 1966 and 1980
• Both 1 million gallon tanks
• Last legged tank constructed in the system
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• Joyce Tank was the Steel Tank Institute tank of the year in 1996
• Standpipe construction
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• Hydro pillar has been the standard tank in the system since 1968
• Typically construct a 2 million gallon tank
• Acquire enough land for future expansion
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Water Storage Tanks
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Booster Stations & Pumps
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Pressure
Reducing
Valves
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Tank Maintenance
• Electronic System Technicians
• Electricians
• Mechanics
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Electronic System Technicians
• Calibrate tank levels
• Check cathodics
• Over-flow sensors
• Door alarms
• Antennas on tops of tanks
• Vents
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Electricians
• Upgrades to electric service
• Aircraft lights
• Interior/exterior lights
• Service drops
• Vents
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Mechanics• Maintain and set tower water levels in summer
and winter months
• Maintain altitude valves
• Exercise yard valves and get valve counts
• Maintain cleanliness of tanks(maintain
bathrooms & entry doors)
• Maintain tank yard (litter pick-up, tree trimming,
snow removal & driveway sealants)
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Washouts• Each tank gets washed out every 3
years
• Minimum of 7 people
• An average washout is 4 hours
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1 Electrician
• Climbs to the top replacing light bulbs
• Opens top hatch for light and airflow
• Check aircraft lights
• Checks top vent screens
• Documents coating conditions of roof
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1 Pumper Operator• Stays at the pumper during the wash
out
• Maintains fuel levels
• Maintains radio contact with the wash
supervisor
• Raises and lowers pressure as
needed
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1 Ground Man
• In charge of equipment layout and pick up
• Operates the flush and drain valves
• Maintains radio contact to complete duties
as needed
• Documents valve counts, locations and
number of turns
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1 Condensate Man
• Raises equipment to the cat walk level
• Assists the ground man
• Climbs after wash out to assist in
equipment retrieval
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Hose Operators
• 1 Electrician and 1 Mechanic
• Check air quality with monitor
• Opens belly hatch
• Sweep bowl with wash out brooms
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Wash Out Supervisor
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Wash in progress
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Exterior of Tank
• Log condition of fence, gate & coatings
• Check the foundation for cracks, missing
grout & exposed rebar
• Look for exterior corrosion on anchor
bolts, clevis & support rods
• Note the amount of fading and expected
life expectancy
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Exterior of Tank• Ladders on exterior of tank needs to be
8 ft from ground. Check the vandal guards on ladders
• Inspect ladders for missing rungs, corrosion & install a safety rail system
• Check screens on overflows
• 42” high handrails, mid rail required & 4” toe kick plate with ¼” gap max
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Exterior of Tank• Roof man ways on legged tanks should
be locked
• Condensate level areas on hydros
should be locked
• Check exterior top hatches for corrosion
check vents, aircraft lights
• Check screens for holes
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Coatings Program
NACE Coatings Level III
www.nace.org
SSPC QP I & II
www.sspc.org
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Anniversary Inspection
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Fail Spot
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Structural Repairs
BEFORE AFTER
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Structural Repairs
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Helpful Tips
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Helpful Tips
• When negotiating cell towers or anything else
mounted on tanks put in the contract that the
company will disassemble when it is time to paint
• Painters rings mounted to ceiling 20 ft apart
• Seam weld not stitch welding
• Spec fiberglass grating
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Helpful Tips• Have the paint representative give a good
estimate of the amount of paint needed and request that the contractor keep all empty containers
• Ladders are for climbing. Do not attach anything to them
• Ask landscape crew to blow off the tank when they blow off the driveways
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Helpful Tips Schedule 80 or SS wash line the best for corrosion
control
4” mud valves should be installed
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Water Quality
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Distribution Monitoring Panels
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Depth Temp Conductivity Dissolved Oxygen pH Free Cl2 Turbidity TTHM HAA5 Comments
(ft) (C) (S/cm) (mg/L) (mg/L) (mg/L) (NTU) (g/l) (g/l)
Surface 10.3 381 11.1 7.5 0.00 0.2 59.4 77.3
2.5 10.3 382 11.0 7.2 0.00 0.8
5.0 10.6 383 10.9 7.6 0.06 0.5 60.9 80.6
7.5 10.5 383 11.0 7.6 0.03 1.2
10.0 10.5 382 11.0 7.6 0.05 1.9 57.3 78.4
12.5 10.4 383 11.0 7.7 0.20 1.1
15.0 10.5 383 10.9 7.5 0.07 1.8 61.6 78.0
17.5 10.4 381 11.0 7.6 0.40 0.3
20.0 10.4 382 11.0 7.6 0.42 0.2 58.6 78.1
22.5 10.5 384 10.9 7.5 0.43 0.2
25.0 10.3 383 11.0 7.5 0.41 0.3 59.9 78.4
27.5 10.4 384 11.0 7.6 0.44 0.2
30.0 10.3 384 10.9 7.5 0.43 0.2 65.7 77.7
32.5 10.4 385 11.0 7.5 0.40 0.2
35.0 10.3 385 11.0 7.6 0.30 0.5 58.6 78.7
37.5 10.2 386 11.0 7.6 0.42 0.3
40.0 10.2 392 11.0 7.6 0.42 0.3 60.3 75.8
42.5 10.1 399 11.0 7.5 0.49 0.3
45.0 10.1 399 11.0 7.5 0.49 0.4 48.6 65.6
47.5 9.9 423 11.1 7.6 0.67 0.3
50.0 9.6 446 11.2 7.7 1.05 0.3 48.4 62.1
Depth Temp Conductivity Dissolved Oxygen pH Free Cl2 Turbidity TTHM HHA5 Comments
(ft) (C) (S/cm) (mg/L) (mg/L) (mg/L) (NTU) (g/l) (g/l)
Bottom 9.5 445 11.2 7.7 0.43 0.5 58.5 45.0
Middle 10.1 383 11.1 7.7 0.38 0.3 59.9 78.9
Surface 10.2 381 11.0 7.6 0.40 0.5 43.1 76.4
Temp Conductivity pH Free Cl2 Turbidity Comments
(C) (S/cm) (mg/L) (mg/L) (NTU)
10.6 438 7.3 1.51 0.07
Profile @ Center of
Tank
Flow was
bypassing the tank
Joyce Avenue Tank Water Quality Profile
Sampling began @ 9:45 and ended @ 11:45; Depth is given as feet below surface; Total depth was ~ 55 feet; Total volume was ~ 3.85 MG
Attendants: Jeff Kauffman, Duane Stokes, Michele Humphrey, Matt Steele, Claudine Pekula, Rich Rutherford, Bic Boyles April 12, 2007
Approximate dead
zone (no chlorine)
is 0.8 MG and
approximate water
age is 6 weeks.
Data from Online
Panel in adjacent
Booster Station
Profile @ Sidewall of
Tank (near drywell)
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Valve Installed…
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Depth Temp Conductivity Dissolved Oxygen pH Free Cl2 Turbidity TTHM HAA5 Comments
(ft) (C) (S/cm) (mg/L) (mg/L) (mg/L) (NTU) (g/l) (g/l)
Surface 0.49 70.9 34.3
2.5 26.2 615 8.9 7.2
5.0 26.3 611 8.5 7.3 0.20 75.2 33.4
7.5 26.1 610 8.9 7.2
10.0 26.3 610 8.7 7.2 0.08 74.4 33.9
12.5 26.1 609 8.7 7.2
15.0 26.2 610 8.2 7.2 0.15 74.2 34.4
17.5 26.1 613 8.8 7.2
20.0 26.3 609 8.1 7.2 0.22 74.4 32.7
22.5 26.1 616 8.7 7.2
25.0 26.4 612 8.0 7.3 0.43 71.5 34.2
27.5 26.1 617 8.7 7.2
30.0 26.2 614 7.9 7.4 0.42 81.9 32.4
32.5 26.1 616 8.7 7.3
35.0 26.2 616 7.9 7.4 0.64 63.2 31.6
37.5
40.0 26.2 619 7.9 7.4 0.68 70.4 33
42.5
45.0 26.2 619 7.9 7.4 0.79 66.4 32.9
47.5
50.0 26.1 620 8.0 7.3 0.17 66.7 30.9
52.5
55.0 26.0 623 7.9 7.2 0.47 65.6 34
57.5
60.0 26.1 640 8.4 7.4 0.52
Depth Temp Conductivity Dissolved Oxygen pH Free Cl2 Turbidity TTHM HHA5 Comments
(ft) (C) (S/cm) (mg/L) (mg/L) (mg/L) (NTU) (g/l) (g/l)
Bottom 26.3 612 8.6 7.5 0.09 70.1 32.4
Middle 26.3 619 8.6 7.4 0.75 66.6 32.1
Surface 26.3 613 8.6 7.4 0.64 66.3 33.0
Profile @ Center of
Tank
Joyce Avenue Tank Water Quality Profile
Sampling began @ 9:00 and ended @ 11:30; Depth is given as feet below surface; Total depth was ~ 60.0 feet; Total volume was ~ MG
Attendants: Michele Humphrey, Matt Steele, Rich Rutherford, Bic Boyles, Rod Dunn, Ron Christian August 29, 2012
Profile @ Sidewall of
Tank (near drywell)
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Mixing Systems
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Mixing Systems for Water Tanks
• Currently have two types of mixing systems – active and passive• First mixing system installed in 2006• Currently 7 mixing systems in the system• 4 passive and 3 active• Evaluated several products through the years
• Solar, air, manifold systems, standpipes, motorized
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Depth Temp Conductivity Dissolved Oxygen pH Free Cl2 TTHM HAA5 Comments
(ft) (C) (S/cm) (mg/L) (mg/L) (mg/L) (g/l) (g/l)
Surface 19.7 280 8.2 7.3 0.70 69.8 42.2
5.0 19.7 280 8.1 7.4 0.80 64.6 41.7
10.0 19.6 280 8.0 7.4 0.81 66.0 41.2
15.0 19.6 280 8.4 7.4 0.86 68.8 42.7
20.0 19.6 280 8.5 7.2 0.92 62.5 41.2
25.0 19.6 280 8.7 7.1 0.59 64.0 44.0
30.0 19.6 280 8.3 7.0 0.40 62.1 40.7
35.0 19.5 281 8.6 7.0 0.26 59.7 40.4
40.0 19.5 284 8.4 6.8 0.04 65.0 40.0
Lazelle (South)Tank Water Quality Profile
Attendants: Michele Humphrey, Rod Dunn, Duane Stokes and Greg Horn September 26, 2012
Sampling began @ 9:00 and ended @ 11:30; Depth is given as feet below surface; Total depth was ~ 60.0 feet
Profile @ Center of
Tank
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Depth Temp Conductivity Dissolved Oxygen pH Free Cl2 TTHM HAA5 Comments
(ft) (C) (S/cm) (mg/L) (mg/L) (mg/L) (g/l) (g/l)
Surface 19.4 293 8.6 7.6 0.92 58.3 38.0
5.0 19.4 293 8.7 7.5 0.95 54.1 38.3
10.0 19.4 294 8.9 7.6 0.97 64.6 36.3
15.0 19.4 294 8.8 7.6 0.84 66.0 37.5
20.0 19.4 294 8.8 7.6 0.91 55.3 37.3
25.0 19.4 294 8.7 7.5 0.83 58.4 39.1
30.0 19.4 293 8.7 7.6 0.93 60.6 37.7
35.0 19.4 294 8.3 7.5 0.89 57.5 39.3
40.0 19.4 294 8.4 7.7 0.71 58.2 38.4
45.0 19.4 302 8.5 7.6 0.78 58.7 38.5
Depth Temp Conductivity Dissolved Oxygen pH Free Cl2 TTHM HHA5 Comments
(ft) (C) (S/cm) (mg/L) (mg/L) (mg/L) (g/l) (g/l)
50' 19.4 302 8.7 7.6 0.85 55.6 41.1
Surface 19.4 294 8.8 7.6 0.88 54.7 38.0
Next to the Mixer
Profile @ Center of
Tank
Lazelle (North)Tank Water Quality Profile
Sampling began @ 9:00 and ended @ 11:30; Depth is given as feet below surface; Total depth was ~ 60.0 feet
Attendants: Matt Steele, Bic Boyles, Tim Huffman, Greg O'Brien September 26, 2012
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Depth Temp Conductivity Dissolved Oxygen pH Free Cl2 TTHM HAA5 Comments
(ft) (C) (S/cm) (mg/L) (mg/L) (mg/L) (g/l) (g/l)
Surface 18.7 269 7.7 7.5 0.80 62.6 50.8
15.0 18.7 269 7.9 7.4 0.75 61.5 52.5
20.0 18.7 269 7.9 7.4 0.61 67.2 52.4
25.0 18.7 268 7.9 7.4 0.82 58.5 50.8
30.0 18.6 269 8.7 7.3 0.89 60.8 51.8
35.0 18.5 269 8.6 7.1 0.83 57.6 51.7
40.0 18.6 270 8.7 7.1 0.72 52.8 51.6
45.0 18.8 273 8.8 7.1 0.81 55.8 51
Depth Temp Conductivity Dissolved Oxygen pH Free Cl2 TTHM HHA5 Comments
(ft) (C) (S/cm) (mg/L) (mg/L) (mg/L) (g/l) (g/l)
Bottom 18.6 266 7.8 7.4 0.80 60.9 49.3 30'
Middle 18.6 269 7.9 7.4 0.85 55.6 52.3 15'
Surface 18.6 269 7.7 7.5 0.75 56.2 51.3
Profile @ Center of
Tank
Taylor East Tank(2MG) Water Quality Profile
Sampling began @ 9:45 and ended @ 10:45; Depth is given as feet below surface; Total depth was ~ 40 feet; Total volume was ~ 10 MG
Attendants: Duane Stokes, Rod Dunn, Cindi Fitzpatrick and Greg Horn October 16, 2013
Over flow 985.5'
Water level 983'.
2.5' down
Profile @ Sidewall of
Tank
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Questions?