Here are the answers to the Aug. 23, 2021 edition of TPO's Exam Study Guide:

1. When conducting a sludge settleometer test, what does the first five minutes of the test indicate?

The answer to this question is D, no useful indication. The settled sludge volume after five minutes of settling in the settleometer is an indication of how fast the sludge is settling. For the first five minutes the sludge is in a free fall state with only a few collisions of floc particles to slow it down (Eckenfelder and Melbinger, 1957). This is in a typical settleometer analysis, and there may be a few exceptions.

2. What public notification is triggered if a water system exceeds the nitrate MCL?

The correct answer is A, Tier 1. The public notification rule is intended to keep the customer base informed about the safety of their water in a timely manner. Depending on the severity of the issue, a system is legally responsible to notify the customer(s) within certain time periods. A Tier 1 notification is considered the highest threat and must be delivered within 24 hours. A few examples of a Tier 1 occurrence would be fecal/E.coli contamination, chlorine dioxide MRDL violation, and/or exceedance of the maximum allowable turbidity level resulting in an MCL violation.


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