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
(1) 90
(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
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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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