Unit 7 Exercise 2:
- Watch the following youtube video and fill out the “Results of Coliform Tests” data sheet as you watch the video to obtain # Coliform Colonies. https://www.youtube.com/watch?v=fBoD8qzOq34&feature=youtu.be
- To determine Q value: Match up the number of coliform colonies identified in the water sample to the graph next to the data table. (Estimation is okay).
- For water quality description: Once you determine the Q value, use table 1 to obtain a water quality description.
- For EPA Standard: The United States Environmental Protection Agency (EPA) standard for drinking water is ZERO coliform bacteria. Type YES if locations meet the EPA standard for coliform bacteria; NO if locations DO NOT meet the EPA standard for coliform bacteria (Hint: 0 colonies = Yes; 1 or more colonies = No)
|Q Value Range||Water Quality Description|
Water Quality can be determined by many other methods. We use this Water Quality Index for some other tests.
Data Sheet: Results of Coliform tests Q-Value Graph Table 1. Water Quality
|Location of Water Sample||# COLIFORM Colonies||Q Value||Water Quality Description||Meets EPA Standard?|
|Example Tap Water||0 coliform colonies||100||Excellent||Yes|
|Santa Clara River – Valencia side|
|Gilbert, AZ Riparian Preserve|
|Ocean – Oxnard, CA|
|Santa Clara River 12/26|
|Riverside Pond (treated)|