Where does all the water go? According to the Environmental Protection Agency (E
ID: 3042074 • Letter: W
Question
Where does all the water go? According to the Environmental Protection Agency (EPA), in a typical wetland environment, 36% of the water is outflow; 46% is seepage; 7% evaporates; and 11% remains as water volume in the ecosystem (Reference: United States Environmental Protection Agency Case Studies Report 832-R-93-005). Chloride compounds as residuals from residential areas are a problem for wetlands. Suppose that in a particular wetland environment the following concentrations (mg/l) of chloride compounds were found: outflow, 58.7; seepage, 72.1; remaining due to evaporation, 46.8; in the water volume, 53.6.
(a) Compute the weighted average of chlorine compound concentration (mg/l) for this ecological system. (Round your answer to one decimal place.)
mg/l
(b) Suppose the EPA has established an average chlorine compound concentration target of no more than 58 mg/l. Does this wetlands system meet the target standard for chlorine compound concentration?
Yes. The average chlorine compound concentration (mg/l) is too high. Yes. The average chlorine compound concentration (mg/l) is lower than the target. No. The average chlorine compound concentration (mg/l) is lower than the target. No. The average chlorine compound concentration (mg/l) is too high.
Explanation / Answer
Part (a)
Weighted Average of Chloride Concentration = 63.47 mg/l ANSWER
Wetland Component
Concentrations of chloride compounds
(mg/l) (x)
Percentage Composition of the Wetland (w)
x.w
Outflow volume
58.7
36%
21.132
Seepage
72.1
46%
33.166
Evaporation
46.8
7%
3.276
Water volume
53.6
11%
5.896
Total
-
100%
63.47
Part (b)
Clearly, Weighted Average of Chloride Concentration of 63.47 mg/l > the EPA Standard
ANSWER
Wetland Component
Concentrations of chloride compounds
(mg/l) (x)
Percentage Composition of the Wetland (w)
x.w
Outflow volume
58.7
36%
21.132
Seepage
72.1
46%
33.166
Evaporation
46.8
7%
3.276
Water volume
53.6
11%
5.896
Total
-
100%
63.47
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