51.   The federal limit for selenium in waste water is a little more than one pound a day.

52.   The nitrogen-rich waste water is then sprayed on fields as a fertilizer.

53.   The main one is the Elektron system, which uses electricity to separate waste water into its constituent parts, oxygen and hydrogen.

54.   The permits regulate all discharges of waste water into streams, lakes and oceans.

55.   The protesting farmers in Johnson County dumped their milk on their own farms, mostly into waste water lagoons, Gary Roden said.

56.   The system is designed so that the waste water remains underground during the weeklong process, without providing malodorous competition to the intoxicating scent of Santa Fe pinyon.

57.   The study is part of an intense education program launched by the water department to reduce insecticides in waste water to comply with federal and state environmental mandates.

58.   The tour at its end, Rickey tosses out a few of the waste water trivia questions he has collected in more than two decades in the field.

59.   The U.S. Filter Corp., a California-based company, used its own money to build a waste water treatment plant outside Mexico City.

60.   The waste water that the Dayton sewage plant discharges into the river now has a lower bacteria count than the river itself, Hall added.