in section 8.7. (b) Why might an estimate of σ be helpful in planning future water sample testing?
Substance MCLG Range Detected Allowable MCLG Origin of Substance
Chromium 0.47 to 0.69 100 Discharge for steel
and pulp mills, natural
Selenium 0 to 0.0014 50 Corrosion of household
plumbing, leaching from
Barium 0.004 to 0.019 2 Discharge from drilling
wastes, metal refineries,
Fluoride 1.07 to 1.17 4.0 Natural erosion, water
additive, discharge from
fertilizer and aluminum
This question was asked on May 23, 2010.
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