Ontario Pipeline - Fall 2013 - (Page 39)

DEPARTMENT | CERTIFICATION CERTIFICATION CORNER Test your knowledge. Questions below resemble those appearing on certification exams. Your comments and suggestions are welcome. If you have specific topics you would like to have included, please contact hkamping@puc.org 5. The advantage of a balanced mechanical seal is that a. it does not turn with the shaft. b. it is balanced with the shaft. c. the wearing surface between the ground surface does not vary regardless of the suction head. d. the ease of replacement. 2. Contaminant monitoring requirements can depend on a. previous violations of maximum contaminant levels (MCLs). b. the result of a vulnerability assessment. c. the size of the water system. d. all of the above. 3. When comparing friction loss in various types of pumps, a larger Hazen-Williams C value indicates the pipe a. is more durable. b. is rougher outside. c. is smoother inside. d. is able to withstand a higher pressure. 8. When should ammonia be added to the water when making disinfectant chloramines to improve disinfection? a. Before the chlorine is added b. After the chlorine is added c. During filtration d. Before filtration 6. Which of the following conditions must you change when your chlorine residual is in hypochlorite ion form? a. Calcium b. Hardness c. pH d. Total alkalinity 1. The primary health risk associated with trihalomethanes (THMs) is a. gastrointestinal diseases. b. nervous system damage. c. cancer. d. increased blood pressure. 9. What precipitate is formed in alum coagulation? a. Aluminum hydroxide b. Complex organoaluminum compounds c. Complex sulphate compounds and aluminum salts d. Aluminum salts and organosulfate compounds. 7. Sodium thiosulfate is added to a microbiological sample bottle in order to a. extend the allowable holding time from 6 to 30 hours. b. react with nitrates that interfere with the MPN test. c. remove any chlorine residual present. d. ensure sterilization of the sample bottle. 4. The angle of repose is the angle of slope of a. cut. b. sewer. c. trench excavation. d. unsupported loose soil. 10. A water sample contains 120 mg/L of calcium and 54 mg/ L of magnesium. What is the total hardness as CaCO3? a. 120mg/L as CaCO3 b. 154 mg/L as CaCO3 c. 174 mg/L as CaCO3 d. 198 mg/L as CaCO3 See answers on page 46. DEPARTMENT | WELCOME Welcome to Our New OWWA Members Individual Members Mike Brannon, City of Toronto Chudamani Burlakoti Holly Cai Doug Campbell, Town of Fort Erie Tanner Devlin Frank Godin, EMA Canada Inc Jennifer Hale Carol Hall, City of Ottawa Rob Harten, PUC Services Inc. Nils Holm, CSA GROUP Erik Lepik, Toronto Water RC Harris Filtration Plant Brenda Lucas, SOWC Tania Lungo, University of Toronto Shean McGhee, City of Elliot Lake Cheryl McKendrick, City of Ottawa Brian Mergelas, Watertap Rogerd Morales Kelly Oakley, City of Barrie Massimo Pontone, Ontario Clean Water Agency Blair Russell, Madison Chemical Industries Cordell Samuels, Regional Municipality of Durham Laura Smit Anton Stoeckl Tonia Van Dyk, C&M Environmental Technologies Inc. Walt Visser, Township of Centre Wellington Wenjie Zeng Service Provider Ontario Clean Water Agency O N T A R I O P I P E L I N E | FALL 2013 | 39

Table of Contents for the Digital Edition of Ontario Pipeline - Fall 2013

From the Publications Chair
The OWWA Report
The OMWA Report
The OWWEA Report
From Our AWWA Director
Using Social Media to Enhance Water Effi ciency, Public Education and Outreach
Engaging Residents through Social Media
WaterISAC – An Essential Part of Your Water or Wastewater Utility’s Security and Emergency Preparedness Toolbox
Committee Reports
Alliance for Water Effi ciency Helps Municipalities Develop Effective Water Conservation Programs
Don’t Flush … Your Drugs! Keep Our Source Waters Clean
Water Bytes
Water Testing in the Field – Guatemala
Demystifying Prefabricated Valve Chambers
Ask the Board
Certifi cation Corner
Welcome New Members
Calendar of Events
OWWEA Member Listing
Index of Advertisers | Ad.com

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