PART 2
You will now test the water samples to check your prediction about which site would be better for the new town.
You have two water samples, one taken from a river close to Town Site A and one from a river close to Town Site B. These are labeled S_{A} and S_{B}. In addition, you have a set of four bags containing test strips to test the water quality of your water samples. Each test strip bag contains test strips, instructions for conducting the test, and a reference chart used to interpret the results.
Use the equipment you have been given to perform your water quality tests on the water samples.
Record the pollutant you tested and your measurements for S_{A} in columns 1 and 2 of Table 1A on page 9.
Record the pollutant you tested and your measurements for S_{B} in columns 1 and 2 of Table 1B on page 10.
You will add further information to Tables 1A and 1B when you have completed your tests.
Sample complete student response:
The two tables below are transcriptions of complete students' responses for both questions 2 and 3.
TABLE 1A: Data and Summary Information for S_{A}
Pollutant Tested 
Level of Pollutant 
Does this Exceed the Maximum Level Allowed? 
Possible Source(s) of Pollutant that Exceeds Maximum Level Allowed 
pH 
4 
no 

Nitrate 
0 
no 

Iron 
.3 
no 

Copper 
.05 
no 

Chloride 
0 
no 

Mercury 
.001 
no 

Turbidity 
2NTU 
no 

Lead 
0 
no 

Benzene 
0 
no 

Coliform 
6% 
yes 
Agriculture areas: Animal Waste 
TABLE 1B: Data and Summary Information for S_{B}
Pollutant Tested 
Level of Pollutant 
Does this Exceed the Maximum Level Allowed? 
Possible Source(s) of Pollutant that Exceeds Maximum Level Allowed 
Ph 
7 
no 

Nitrate 
10 
no 

Iron 
0 
no 

Copper 
.05 
no 

Chloride 
0 
no 

Mercury 
0 
no 

Turbidity 
6NTU 
Yes 
roads and parking lots eroded soil particles 
Lead 
.010 
no 

Benzene 
.003 
no 

Coliform 
1% 
no 

Part A
Level of Pollutant for Site A

pH

Nitrate
(ppm or mg/L)

Iron
(ppm or mg/L)

Copper
(ppm or mg/L)

Site A (S_{A})

3 – 4

0 – 2

0.3 – 1

0 – 0.05

Complete:
Student response lists the four pollutants tested in Table 1A and the correct level for each pollutant. The correct results are shown in the table.
Essential:
Student response lists at least three pollutants in Table 1A and the correct levels for three pollutants.
Partial:
Student response lists at least one pollutant in Table 1A and the correct level for the pollutant.
Unsatisfactory/Incorrect:
Student response is inadequate or incorrect.
Part B:
Level of Pollutant for Site B

pH
 Nitrate
(ppm or mg/L)

Iron
(ppm or mg/L)

Copper
(ppm or mg/L)

Site B (S_{B})

6.5 – 7.5

2 – 50

0 – 0.3

0.05 – 0.2

Complete:
Student response lists the four pollutants tested in Table 1B and the correct level for each pollutant. The correct results are shown in the table.
Essential:
Student response lists at least three pollutants in Table 1B and the correct levels for three pollutants.
Partial:
Student response lists at least one pollutant in Table 1B and the correct level for the pollutant.
Unsatisfactory/Incorrect:
Student response is inadequate or incorrect.
Composite Score:
Student response received one of five possible composite scores (Complete, Satisfactory, Essential, Partial, and Unsatisfactory/Incorrect) based on the student's combined performance on Parts A and B of the item. For example, a student response Complete for Part A, and Essential for Part B received a composite score of Satisfactory.
Composite Score

Part A

Part B

Complete

Complete

Complete

Satisfactory

Complete

Essential

Essential

Complete

Essential

Essential

Complete

Partial

Partial

Complete

Essential

Essential

Partial

Partial

Essential

Complete

Unsatisfactory/Incorrect

Unsatisfactory/Incorrect

Complete

Partial

Essential

Unsatisfactory/Incorrect

Unsatisfactory/Incorrect

Essential

Partial

Partial

Partial

Unsatisfactory/Incorrect

Unsatisfactory/Incorrect

Partial

Unsatisfactory/Incorrect

Unsatisfactory/Incorrect

Unsatisfactory/Incorrect

Percentage of twelfthgrade students in each response category: 2009
Complete 
Satisfactory 
Essential 
Partial 
Unsatisfactory/ incorrect 
Omitted 
39 
42 
7 
6 
5 
1 
Now add the test results from the outside laboratory (Reference Chart 3) to columns one and two of Tables 1A and 1B. Remember to write the results from sample S_{A} in Table 1A and the results from sample S_{B} in Table 1B.
Then complete columns three and four of Tables 1A and 1B using the reference materials you have been given in your kit.
When completed, these tables will help you to evaluate the water quality at each proposed town site.
This item was scored in 2 parts:
Part A: Summary of pollutant levels for Site A
Part B: Summary of pollutant levels for Site B
Part A
Complete:
Student response shown in Table 1A consists of two parts.
 Column 3 shows a correct interpretation of the results in Column 2, indicating whether or not each pollutant level exceeds the maximum level allowed based on Chart 2 and the results in Column 2.
 Column 4 indicates a valid source of the pollutant(s) that the student response in Column 3 indicates exceeding the maximum level allowed. Valid sources are found in Reference Chart 1.
Student response is scored based on the interpretation of the results indicated in Table 1A. There is no penalty for providing incorrect water test results or for copying pollutant levels incorrectly from Chart 3. Since pH falls below the acceptable limits at Site A, indicating Yes or No for exceeding the maximum level allowed is acceptable.
Partial:
Student response shown in Table 1A indicates correct interpretation of the results and a valid source of the pollutant(s) that exceed the maximum level allowed for 29 of the total of 10 pollutants.
Unsatisfactory/Incorrect:
Student response is inadequate or incorrect.
Part B
Complete:
Column 3 shows a correct interpretation of the results in Column 2, indicating whether or not each pollutant level exceeds the maximum level allowed based on Chart 2 and the results in Column 2.
 Column 4 indicates a valid source of the pollutant(s) that the student response in Column 3 indicates exceeding the maximum level allowed. Valid sources are found in Reference Chart 1.
Student response is scored based on the interpretation of the results indicated in Table 1B. There is no penalty for providing incorrect water test results or for copying pollutant levels incorrectly from Chart 3.
Partial:
Student response shown in Table 1B indicates correct interpretation of the results and a valid source of the pollutant(s) that exceed the maximum level allowed for 29 of the total of 10 pollutants.
Unsatisfactory/Incorrect:
Student response is inadequate or incorrect.
Composite Score:
Student response received one of four possible composite scores (Complete, Essential, Partial, and Unsatisfactory/Incorrect) based on the student's combined performance on Parts A and B of the item. For example, a student response Complete for Part A, and Partial for Part B received a composite score of Essential.
Composite Score

Part A

Part B

Complete

Complete

Complete

Essential

Complete

Partial

Partial

Complete

Partial

Partial

Complete

Unsatisfactory/Incorrect

Unsatisfactory/Incorrect

Complete

Partial

Partial

Unsatisfactory/Incorrect

Unsatisfactory/Incorrect

Partial

Unsatisfactory/Incorrect

Unsatisfactory/Incorrect

Unsatisfactory/Incorrect

Percentage of twelfthgrade students in each response category: 2009
Complete 
Essential 
Partial 
Unsatisfactory/ incorrect 
Omitted 
9 
65 
9 
16 
2 
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2009 Science Assessment.