work
ssh840962430Unit 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 |
0-35 |
Poor |
35-55 |
Fair |
56-80 |
Good |
81-100 |
Excellent |
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 |
Fish Tank |
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Santa Clara River – Valencia side |
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Gilbert, AZ Riparian Preserve |
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Bottled Water |
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Ocean – Oxnard, CA |
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Santa Clara River 12/26 |
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Riverside Pond (treated) |
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Whitney Canyon |
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