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Sherpa Level 1 Practice Exam
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What is the standard chlorine residual and minimum contact time required on Texas wastewater permits?
0.5 mg/L for a minimum 10 minutes detention time.
1.0 mg/L for a minimum 20 minutes detention time at peak flow.
2.0 mg/L for a minimum 30 minutes detention time.
0.2 mg/L for a minimum 15 minutes detention time.
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Correct Answer:
1.0 mg/L for a minimum 20 minutes detention time at peak flow.
Explanation:
The Texas standard for chlorine residual is 1.0 mg/L for a minimum 20 minutes detention time at peak flow, with a maximum residual allowed of 4.0 mg/L.
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