Here are the answers to the June 24, 2020 edition of TPO's Exam Study Guide:

1. Where may an operator look to find specific laboratory procedures and the proper compliance for those procedures?

The answer to this question is A, NPDES permit. The actual source for addressing laboratory testing is the facilities National Pollution Discharge Elimination System (NPDES) permit. Parameter are spelled out as to what is monitored and what test shall be used. The laboratory testing is governed by standard procedures that have been published by professional organizations and the various state and federal agencies. Understanding these guidelines and procedures are very important for the operator or lab technician to properly conduct testing needed to monitor plant processes and effluent parameters. 

2. At what water temperature would an operator expect the highest dissolved oxygen concentration in mg/L?

The correct answer is D, 0 degrees C. Introducing dissolved oxygen into the water through aeration is common practice when treating groundwater with elevated levels of carbon dioxide, hydrogen sulfide, methane, volatile organic chemicals, and/or iron. The amount of oxygen capable of remaining dissolved in the water is dependent on the temperature of the water. The colder the water, the higher the dissolved oxygen concentration in mg/L. For example, 0-degree C water is capable of 14.621 mg/L dissolved oxygen and 50-degree C water is capable of 5.477 mg/L dissolved oxygen.


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