A home gets its water from the public supply. Which of the following would be the best way for the homeowner to obtain a water-quality report?
Question 11 (Essay Worth 5 points)
<object:standard:la.910.2.2.3>Summarize your findings from the Water Quality Lab. Be sure to include your observations and the sources of each water-quality issue you investigated.
Question 12 (Essay Worth 5 points)
<object:standard:sc.912.n.1.1; ma.912.s.3.2=””>Dan took three samples of water from the creek behind his house once a month for the last six months. He tested the water and reported the results in the following data table.
Water Quality Indicator
Test Results
Dissolved oxygen
Dissolved oxygen levels in the last three months decreased rapidly.
Fecal coliform
Fecal coliform ranges from a low of 89 colonies per liter to 102 colonies per liter over the six-month period.
Nitrates
Nitrate levels ranged from 6 to 7 mg/L.
Phosphates
Phosphate levels were between 0.01 mg/L and 0.3 mg/L.
pH
The average pH was 6.9.
Turbidity
The water was clear in the first few months, but it became increasingly cloudy over time.
Which water-quality indicators would be of concern in this situation? Explain your response. Be sure to discuss any implications these water-quality indicators could have on the environment and human health.
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