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CHAPTER 4 WATER QUALITY
Review Question Page References
(11) 98 (21) 104
(12) 98 (22) 105
(13) 98 (23) 105
(14) - (24) 106
(15) 102 (25) 106
(16) 101 (26) 106
(17) 102 (27) 107
(18) 102 (28) 107
(19) 103 (29) 108
(20) 103 (30) 108
(42) www.epa.gov/nerlcwww
(31) 108
(32) 110
(33) 110
(34) 112
(35) 112
(36) 112
(37) 113
(38) 114
(39) 115
(40) 117
(43) www.envirosources.com
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(2) 93
(3) 93
(4) 94
(5) -
(6) 94
(7) 94
(8) 95
(9) 96
(10) 98
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Solutions to Practice Problems
1. 275 ppm = 275 mg/L (since 1 ppm = 1 mg/L)
4. 30 ac-ft x 43,560 ft3/ac-ft x 7.48 gal/ft3 = 9,775,000 gal
9
8. BOD5 = 14 - 6 = 8 mg/L; there apparently is some organic material in the stream,
10. BODt = BODL x (1 - 10-kt} (Equation 4-2)
12; BOD5 =280 x (1 -10-0.1 X 5 ) = 190 mg/L (Eq. 4-2)
14. TSS = (A - B) x 1000/C (Equation 4-4)
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