Water and Pollution Control Department - Water Pollution Control Facility

Water and Pollution Control Department

Water Quality Data for July 2010

(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	7.23
	Maximum Day, million gallons per day	9.01
	Minimum Day, million gallons per day	5.91
Total Effluent Flow to Skunk River, million gallons		224.16
Equalization Diversion to River, million gallons

Average Influent/Effluent Values (mg/L)

Parameter		Influent	Effluent	Effluent Permit Limit
CBOD₅
	Monthly Average Concentration (mg/L)	115	4.0	20
	Maximum Weekly Average Concentration (mg/L)	NA	6	30
	Monthly Average Mass (lb/day)	6,816	242	2,795
	Maximum Weekly Average Mass (lb/day)	NA	304	1,853
	Average % Removal	NA	96	>85
TSS
	Monthly Average Concentration (mg/L)	173	11.0	30
	Maximum Weekly Average Concentration (mg/L)	NA	13	45
	Monthly Average Mass (lb/day)	10,320	681	4,540
	Maximum Weekly Average Mass (lb/day)	NA	734	3,027
	Average % Removal	NA	93	>85
NH₃
	Monthly Average Concentration (mg/L)	12.5	0.13	5.7 (Nov-Mar) 2.3 (Apr-Oct)
	Maximum Weekly Average Concentration (mg/L)	NA	0.14	8.6 (Nov-Mar) 3.5 (Apr-Oct)
	Monthly Average Mass (lb/day)	966	7.7	551 (Nov-Mar) 224 (Apr-Oct)
	Maximum Weekly Average Mass (lb/day)	NA	8.3	827 (Nov-Mar) 336 (Apr-Oct)
DO
	Minimum Weekly Average Concentration (mg/L)	NA	8.2	>6.0 (Mar-Dec) >5.0 (Jan-Feb)
pH
	Daily Maximum	7.4	8.2	9.0
	Daily Minimum	7.0	7.9	6.0
WET
	Pass/Fail*	NA	Not Tested	No Acute Toxicity

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