Water and Pollution Control Department

Water Quality Data for March 2008

(Taken from the Monthly Operating Report submitted to
the Iowa Department of Natural Resources)
This information is usually updated around the 20th of
the following month.

Wastewater Flow Rates

Influent Flows
	Average Day, million gallons per day	6.48
	Maximum Day, million gallons per day	8.87
	Minimum Day, million gallons per day	5.40
Total Effluent Flow to Skunk River, million gallons		200.83
Equalization D0iversion to River, million gallons		0.00

Average Influent/Effluent Values (mg/L)

Parameter		Influent	Effluent	Effluent Permit Limit
CBOD₅
	Monthly Average Concentration (mg/L)	147	4	20
	Maximum Weekly Average Concentration (mg/L)	NA	6	30
	Monthly Average Mass (lb/day)	7,970	244	2,795
	Maximum Weekly Average Mass (lb/day)	NA	321	1,853
	Average % Removal	NA	97	>85
TSS
	Monthly Average Concentration (mg/L)	224	11.3	30
	Maximum Weekly Average Concentration (mg/L)	NA	12	45
	Monthly Average Mass (lb/day)	12,235	622	4,540
	Maximum Weekly Average Mass (lb/day)	NA	646	3,027
	Average % Removal	NA	95	>85
NH₃
	Monthly Average Concentration (mg/L)	21.7	0.12	5.7 (Nov-Mar) 2.3 (Apr-Oct)
	Maximum Weekly Average Concentration (mg/L)	NA	0.15	8.6 (Nov-Mar) 3.5 (Apr-Oct)
	Monthly Average Mass (lb/day)	1,174	6.8	551 (Nov-Mar) 224 (Apr-Oct)
	Maximum Weekly Average Mass (lb/day)	NA	7.9	827 (Nov-Mar) 336 (Apr-Oct)
DO
	Minimum Weekly Average Concentration (mg/L)	NA	10.4	>6.0 (Mar-Dec) >5.0 (Jan-Feb)
pH
	Daily Maximum	7.8	7.8	9.0
	Daily Minimum	7.0	7.3	6.0
WET
	Pass/Fail*	NA	Not Tested	No Acute Toxicity

* = Whole Effluent Toxicity analysis required once per 12 months.