8 A real estate developer in Santa Fe wants to create a Tota

8) A real estate developer in Santa Fe wants to create a \"Totally-Green\" community for wayward Hollywood types that features on-site wastewater recycling, 100% solar energy, and drinking water supplied solely by a large community rainwater collection and storage device called the \"Earth Mother\" He indicates to prospective clients that this will be a very exclusive community consisting of just 20 individual households, each situated on roughly five acres of land. Based on these characteristics, this community would be exempt from SDWA rules and regulations.

True

False

9) Which of the following factors might regulators take into account when considering whether to revise lower the MCL for a particular water contaminant.

a) Magnitude of health protection afforded by lowering MCL

b) Additional cost associated with reducing contaminant levels to meet revised MCL

c) Technological feasibility of lowering contaminant level to meet revised MCL

d) All the above

10) In 2015, investigators from Virginia Technical University collected samples of tap water from 252 households in Flint Michigan and analyzed them for lead content. They found that 40% of the samples contained lead in excess of 5 ppb and 10% of the samples (90th percentile) contained greater than 25 ppb of lead. Several samples exceeded 100 ppb and one sample exceeded 1,000 ppb. One reasonable explanation for this wide variation in water lead levels from one house to another in Flint would be variation in the presence and prevalence of leaded plumbing in each household.

True

False

Solution

8. Answer - True - Because according to SDWA the quality of the water has to be checked. Even though it is a rain water the quality of the water has to be checked.

9. Answer - Option A - The magnitude of health protection afforded by lowering MCL is only considered

10. Answer - True - Leaded plumbing could be the cause for the variation in the lead concentration in each household.