Unit7E2.docx

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 Colonieshttps://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

https://lh6.googleusercontent.com/07qi7JUwCwDCwKpliLvpSwntbY9JPzYR82xoCzAOxdct8YEyTmjdyWsMWabFa1A4cQhmlodENm3S_Ejhi6cIKbQFbClrOlruQf9m1sMwoFWBrdTcMiI18PXZYTNefmOwv6NnpyIs

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

Santa Clara River – Valencia side

Gilbert, AZ Riparian Preserve

Bottled Water

Ocean – Oxnard, CA

Santa Clara River 12/26

Riverside Pond (treated)

Whitney Canyon