What is the allowable concentration of six organic pollutants in drinking water?

Answer 1

Click on list of contaminants and their MCL and read from the list.
http://water.epa.gov/drink/contaminants/index.cfm

Answer 2

Thanks that helped.

Answer 3

the distance between two successive crests in waves is 1.50m, and the source generates 25 crests and 25 troughs in 5.00sec. what is the speed of the waves?