Jaffrey City’s Problem
LIMITED LICENSE TO MODIFY. These PowerPoint® slides may be modified only by teachers
currently teaching the Science and Global Issues SEPUP course to customize the unit to match
their students’ learning levels or to insert additional teaching aides. Modified slides may be used
only by the modifying teacher in his or her classroom, or shared with other teachers of Science
and Global Issues within the teacher’s school district, with these same restrictions. Modified slides
may not be taken out of the classroom or distributed to any non-student person or organization.
Except for use with students in the classroom, modified slides may not be published in printed or
electronic form, including posting on the Internet. Only text may be modified: photographs and
illustrations on the slides may not be modified in any way except to change their size.
DISCLAIMER OF WARRANTY. THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
(“University”) MAKE NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE. University will not be liable for any costs, damages,
fees or other liability, nor for any direct, indirect, special, incidental or consequential damages
(including lost profits) with respect to any claims by the purchaser or user of Science and Global
Issues or any third party on account of or arising from the use or modifications to the slides. Client
acknowledges and accepts that University services are provided on an as-is basis.
Activity 5: Jaffrey City’s Problem
Get
Started

What indicators could be used to evaluate
water quality?
Activity 5: Jaffrey City’s Problem
Introduction
Read the Introduction. Think about the
following:

How does a contaminated lake impact the
economic, environmental, and social
sustainability of the Jaffrey Lake
community?
Activity 5: Jaffrey City’s Problem

What does the unit “part per
million (ppm)” mean?
Activity 5: Jaffrey City’s Problem
Challenge

How can phosphate and nitrate indicators
help identify the contamination problem in
Jaffrey Lake?
Activity 5: Jaffrey City’s Problem
Procedure

What is the best way to test for
contamination in a large lake when you
have limited resources for testing?
Activity 5: Jaffrey City’s Problem
Procedure

Work with your group to complete the
testing procedure for the water samples
(steps 1-9).
Activity 5: Jaffrey City’s Problem
Procedure

Your research in step 10 will help you
complete step 11. Read through step 11
before you begin your research.
Activity 5: Jaffrey City’s Problem
Procedure

Did your findings agree with those of your
classmates?
Activity 5: Jaffrey City’s Problem
Follow Up


What do your test results indicate about
the sustainability of Jaffrey Lake?
Do your test results alone provide enough
evidence to show a causal relationship?
Activity 5: Jaffrey City’s Problem
Revisit the
Challenge

How can phosphate and nitrate indicators
help identify the contamination problem in
Jaffrey Lake?
Activity 5: Jaffrey City’s Problem
Key
Vocabulary





correlation
causal relationship
eutrophication
evidence
indicator
Activity 5: Jaffrey City’s Problem