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Preparations to file for a npdes permit

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Reference no: EM13870368

The ABC Tannery has asked you to assist them in preparations to file for a NPDES permit to discharge wastewater into the XYZ River. The Dept. of Natural Resources water quality criterion for the XYZ River is 5.00 mg/L of DO. They have asked you the following questions: What is the critical DO and where (at what distance) downstream does it occur? They have provided you with the following data. The flow data pertain to the 7-year, 10-day low flow at the tannery.

Parameter

ABC wastewater

XYZ River

Flow, m3/s

1.148

8.222

BOD5 at 20oC, mg/L

90.00

N/A

BODult at 20oC, mg/L

N/A

7.66

DO, mg/L

1.00

6.00

Temperature, oC

17.5

15.0

k at 20oC, d-1

0.3685

N/A

Speed, m/s

N/A

0.300

Depth, m

N/A

2.92

Bed-activity coefficient

N/A

0.100

Submit a copy of your spreadsheet solution with a graph showing your results on Moodle. No hard copy will be accepted.  Make sure to useappropriate significant digits.

Reference no: EM13870368

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