Geology Reference
In-Depth Information
Exercise 14 • Lake and River Contamination from Industrial Waste
223
FIGURE 14.4 Water quality in the Mahoning River. Ranges of sulfate concentrations (mg/L) for water types are:
1 = 50-150; 2 = 151-250; 3 = 251-350; and 4 = 351-450.
TABLE 14.3 Range in Water Quality Factors for the Mahoning River, Sites 1-7
Site Number
Sulfate (mg/L)
Chloride (mg/L)
Temperature (°F)
PH
1
151-250
36-50
6.6-7.0
73-79
2
50-150
20-35
7.1-7.5
73-79
3
351-450
36-50
6.6-7.0
80-86
4
351-450
36-50
6.1-6.5
80-86
5
251-350
51-65
5.5-6.0
80-86
6
251-350
51-65
6.1-6.5
87-93
7
351^50
66-80
6.1-6.5
94-100
TABLE 14.4 Numerical Classification of Water (water types)
Water-Quality Factor
Type 1 (blue)
Type 2 (yellow)
Type 3 (green)
Type 4 (red)
50-150
mg/L
151-250
mg/L
Sulfate
251-350
mg/L
351-450
mg/L
20-35
mg/L
36-50
mg/L
51-65
mg/L
66-80
mg/L
Chloride
7.1-7.5
6.6-7.0
6.1-6.5
5.5-6.0
pH
73-79
80-86
87-93
94-100
Temperature
(°F)
refer to the reach of the river extending upstream to the next sampling
3.
Why did the sulfate concentration decrease from site 1 to
site.
Make a separate map for each water-quality factor. You
site 2?
may use distinct patterns if color is not available. Note: water
types are defined by concentration range in each figure caption
and in Table 14.4.
4.
Why did the pH decrease significantly between sites 2 and 5?
2.
What is the most likely source of the relatively high sulfate
concentration at site 1?
