1. A large sedimentation basin measures 12 feet wide by 40 feet deep by 125 feet long. How many cubic feet of space are in the basin?
A. 6,000 cubic feet
B. 6,000,000 cubic feet
C. 60,000 cubic feet
D. 600,000 cubic feet
2. A water treatment plant ran an average flow of 2082 gpm for a continuous 12-hour period. How many gallons of water did the plant run during this period?
A. 1.499 MG
B. 1,499,040 gallons
C. 3 MGD
D. 1,510,652 gallons
3. A flocculation basin is 40 feet long by 10 feet wide by 11 feet deep. How many gallons of water will the basin hold?
A. 3,291 gallons
B. 329,120 gallons
C. 3.29 MG
D. 32,912 gallons
4. A water treatment plant produced 14.55 MG of water on Monday, 17.69 MG of water on Tuesday, 12.71 MG of water on Wednesday, and 19.3 MG of water on Thursday. What was the plant's average daily water production for this four-day period?
A. 16.06 MG
B. 15.57 MG
C. 14.08 mg
d. 16.49 MG
5. An 8-foot by 10-foot anthracite filter is filtering 310 gpm of water. What is the filtration rate of the filter?
A. 2.5 gallons per square foot per minute
B. 3.9 gallons per cubic foot per minute
C. .258 gallons per square foot per minute
D. 3.9 gallons per square foot per minute
6. How many cubic inches are in a 10-foot length of 3-inch pvc piping?
A. 84.8
B. 8,480
C. 848
D. None of the above
7. What is the detention time in an 8-foot by 90-foot by 25-foot basin if the flow through the basin is 490 gpm?
A. 2.75 hours
B. 4.58 hours
C. 3.19 hours
D. 4.90 hours
8. What is a water treatment plant's alum dosage if the plant uses 2075 pounds of alum to treat 5,400,000 gallons of water?
A. 36 mg/l
B. 46 mg/l
C. 54 mg/l
D. 4.6 mg/l
9. How many pounds of zinc orthophosphate will a water treatment plant use if the plant uses a dosage of 1.75 ppm to treat 9,570,000 gallons of water?
A. 14 pounds
B. 104 pounds
C. 140 pounds
D. 10.4 pounds
10. How many gallons of water can be treated by 1000 pounds of caustic at a dosage of 16 mg/l?
A. 65.25 MG
B. 3.64 MG
C. 7.49 MG
D 13.77 MG
11. What is its lime dosage if a water treatment plant uses 85 pounds of lime to treat 3,200,000 gallons of water?
A. 2.3 ppm
B. 3.9 ppm
C. 7.4 ppm
D. 3.2 ppm
12. How many pounds of coagulant-aid polymer will be needed to dose 50 MG of water with a 1.0 mg/l dosage?
A. 41.7 pounds
B. 100 pounds
C. 417 pounds
D. 1000 pounds
13. What is the basin overflow rate for a 9-foot wide by 50-foot long sedimentation basin if the flow through the basin is 329 gpm?
A. 1.37 gallons per square foot per minute
B. .73 gallons per square foot per minute
C. 1.73 gallons per square foot per minute
D. .37 gallons per square foot per minute
14. What is the water pressure at the base of a standpipe containing 115.5 feet of water?
A. 20 psi
B. 115.5 psi
C. 80 psi
D. 50 psi
15. How many gallons of water will a circular basin hold if it has a 30-foot diameter and a 15-foot height?
A. 366,000 gallons
B. 79,269 gallons
C. 34,636 gallons
D. 45,583 gallons
ANSWERS: 1. C; 2. B; 3. D; 4. A; 5. D; 6. C; 7. B; 8. B; 9. C; 10. C; 11. D; 12. C; 13. B; 14. D; 15. B