16 If a faucet is dripping at a rate of one drop per second and each drop contains 0.150 milliliters, calculate how much water (in liters) will be lost in one year.

18 The American Water Works Association estimates that 15% of the water that utilities process is lost each day. Assuming that the loss was from Public Supply Withdrawal in 2000 (problem 12), estimate the total value of the lost water if delivered water costs $0.45 per cubic meter.

13 Using the Internet, answer the following questions regarding the Clean Air Act: (a) Title II of the act addresses what kinds of pollution sources? (b) What is the chemical name of the first hazardous air pollutant listed under Title III? (c) Section 604 of the act lists the phase-out of production of substances that deplete the ozone layer. What is the last year that carbon tetrachloride can be produced?