DISTRIBUTION SYSTEM TANK MONITORING AND WATER QUALITY. Red Valve Company

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1 DISTRIBUTION SYSTEM TANK MONITORING AND WATER QUALITY Red Valve Company

2 RATIONALE Tanks play a key role in distribution system operations Tanks have many challenges, including degraded water quality Properly assessing tanks is key to developing a corrective action plan 2

3 OUTLINE Increased tank monitoring Inlet / outlet grab samples In-tank temperature monitoring In-tank grab samples Continuous monitoring Operational data Data-based decisions Red Valve Company

4 DISTRIBUTION WATER QUALITY Distribution water quality issues! Distribution piping? Backflow? Water age? Tank design and operations? 4

5 DISTRIBUTION WATER QUALITY How are my tanks impacting my water quality? Is compliance water quality data enough? How do I determine the cause of water quality issues? 5

6 Increased monitoring Grab samples In-tank monitoring Continuous monitoring Tank operational data 6

7 Inlet / outlet grab samples Sample at END of fill cycle Best water Sample at END of draw cycle Worst water Note tank phase Inlet / Outlet Sample Tap Incorporate Worst Case Scenario 7

8 Inlet / outlet grab samples 8

9 Inlet / outlet grab samples 9

10 Safety Climbing gear PPE Training 10

11 In-tank temperature monitoring Temperature probe Temperature dataloggers During inspection Determine if thermal stratification is occurring within the tank Note tank phase Temp probe ROV Temp datalogger string 11

12 Colder Water is Negatively Buoyant Influent Will Sink To Bottom Influent Will Not Mix Regardless of Length of Fill Cycle 12

13 In-tank temperature monitoring In tank (thermal) stratification Greater than 2 o Fahrenheit is significant Temperatures do not converge during fill cycle showing poor mixing 13

14 In-tank temperature monitoring Very little temperature separation Temperatures converge during fill cycles showing good mixing 14

15 In-tank temperature monitoring 15

16 In-tank grab samples Sample water quality at various depths throughout the tank Data to indicate whether stratification or tank operations are impacting in-tank water quality Note tank phase Incorporate Worst Case Scenario 16

17 In-tank grab samples In-Tank Sample Lines In-tank sample taps In-tank sample taps & sink In-Tank Sample Tap Enclosure 17

18 In-tank grab samples Sample from the hatch Purge Pump Kemmerer sampler 18

19 In-tank grab samples 2.0 MG Groundlevel reservoir Concrete Vertical common inlet / outlet 19

20 Continuous monitoring Provide a clearer picture of water quality over time and under various conditions Multi-Probe Monitor Daily and seasonal variations THM Analyzer 20

21 Continuous monitoring - daily 0.50 MG Hydropillar Common inlet / outlet Turnover time: 6 Days 21

22 Continuous monitoring - seasonal 2.2 MG Welded steel Ground storage tank Common inlet / outlet Turnover time: 20 Days 22

23 OPERATIONAL DATA Tank operational data Tank levels Compare tank level to water quality data Determine tank turnover Tank Level Display 23

24 OPERATIONAL DATA Tank operational data 24

25 OPERATIONAL DATA Tank operational data 25

26 OPERATIONAL DATA Tank operational data 0.50 MG Standpipe Bolted steel Vertical common inlet / outlet Located at dead-end Turnover time: 18 days 26

27 DATA-BASED DECISIONS Data-based decisions Important to have the correct data to make decisions Good data = good decisions Validate changes or improvements 27

28 SUMMARY Tanks can have a major impact on distribution system water quality Collecting the proper data is key to evaluating tank performance Good data leads to good decisions Data is critical to validate changes or improvements 28

29 THANK YOU! Paul Handke TMS Product Manager 600 North Bell Ave. Carnegie, PA P: (412) x 255 C: (412) F: (412) Red Valve Company