School: Cedar Valley Christian School
Date: October 21, 1999 Time: 10:30 am
Water Conditions: clear, cold, 10 degrees Celsius
Weather Conditions: sunny
Air Temperature: 22 degrees Celsius
Flow rate: 0.4 meters/second
River/Stream: Indian Creek
River Mile Marker: N/A
Location: 0.25 miles upstream from Cottage Grove Ave. SE, CR
Latitude: 41 deg. 59 min. 45 sec.
Longitude: 91 deg. 36 min. 18 sec.
Site: middle of creek
Site Location or Address: 0.25 miles upstream from Cottage
Grove Ave. SE, CR
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Test 1
Dissolved Oxygen
DOday1 11 mg/L
98% Sat
Q-Value 99
Weighing Factor 0.17
Total 16.83%
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Test 2
Fecal Coliform
34 colonies/100mL
Q-Value 59
Weighing factor 0.16
Total 9.44%
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Test 3
pH 7.7
Q-Value 90
Weighing factor 0.11
Total 9.9%
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Test 4
BOD
DOdays mg/L DOday1 11 mg/L-DOday5
8.4 mg/L = 2.6 mg/L
Q-Value 68
Weighing factor 0.11
Total 7.48%
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Test 5
Temperature Change
Temp (site 1) 10 degrees Celsius
Temp (site 2) 9.5 degrees Celsius
T= 0.5 degrees Celsius
Q-Value 92
Weighing Factor 0.10
Total 9.2%
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Test 6
Phosphate
0.99 mg/L
Q-Value 41
Weighing Factor 0.10
Total 4.1%
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Test 7
Nitrate
1.7 mg/L
Q-Value 95
Weighing Factor 0.10
Total 9.5%
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Test 8
Turbidity
3.3 NTU
Q-Value 90
Weighing
Factor 0.08
Total 7.2%
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Test 9
Total Solids
0.86 mg/L
Q-Value 80
Weighing Factor 0.07
Total 5.6%
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OVERALL WATER QUALITY INDEX
79.25%
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Overall Water Quality Index Quality of Water
90% - 100% Excellent
70% - 90% Good
50% - 70% Medium
25% - 50% Bad
0% - 25% Very bad
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