Question

1. what is a disease-causing microorganism?

a. pathogen
b. colilert
c. pathological
d. turbidity

1. according to surface water treatment rule, what is the combined inactivation and removal for giardia?

a. 1.0 logs
b. 2.0 logs
c. 3.0 logs
d. 4.0 logs

1. what is the equivalency expressed as a percentage for the swtr inactivation and removal of viruses?

a. 99.9%
b. 99.99%
c. 99.0 %
d. 99.999 %

1. a water agency that takes more than 40 coliform samples. what percentile must it fall under?

a. 10%
b. 7%
c. 5%
d. no positive samples allowable

Explanation:

1. A pathogen is defined as a microorganism that causes disease, while the other terms refer to a testing method, a disease-related adjective, and a water clarity measurement respectively.
2. The Surface Water Treatment Rule (SWTR) requires a combined 3.0 Logs of inactivation/removal for Giardia.
3. A 4.0 Log removal/inactivation (required for viruses under SWTR) equals a 99.999% reduction in viral particles.
4. For water systems collecting over 40 coliform samples, regulatory standards mandate that positive samples must fall under the 5th percentile.

Answer:

1. a. pathogen
2. c. 3.0 Logs
3. d. 99.999 %
4. c. 5%