# Exam Study Guide: Quicklime Use and Water Main Calculations

Maintaining your education is important, especially in a career that demands licensing exams. Prove you’re an expert operator by answering these questions and others from our Exam Study Guide Series.

Welcome back to TPO magazine's Exam Study Guide Series, which offers a pair of water/wastewater study questions with in-depth explanations of the answers. Last time, we covered a set of wastewater and drinking water treatment questions on the topics of BOD Readings and Venturi Meters. This time you can test your knowledge about quicklime use and water main calculations.

## Wastewater Treatment Sample Question

Anhydrous or quicklime is great for pH adjusting and coagulating solids, what must be done before it can be used?

A. It must be properly mixed with a polymeric flocculant
B. It must be slaked (mixed with water)
C. It must be stored under a heating source if temperature may fall below 3 degrees F
D. It must be agglomerated with a mixing compound

## Water Treatment Sample Question

An operator replaces 100 feet of 4-inch diameter main with 100 feet of 8-inch diameter main. Approximately, how many gallons of water will the 8-inch diameter main hold, if the 4-inch diameter main holds 65 gallons?

A. 100
B. 130
C. 160
D. 260

To see answers for both of the above questions, click this link.

About the authors: Rick Lallish is the Water Pollution Control program director at the Environmental Resources Training Center of Southern Illinois University-Edwardsville. He provides training for entry-level operators in the wastewater field and operators throughout the state looking to further their education. Lallish was also named the 2017 Illinois Operator of the Year and 2018 president of the Illinois Association of Water Pollution Control Operators.

Drew Hoelscher is the program director of drinking water operations at the Environmental Resources Training Center in Edwardsville, Illinois.

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