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Calumet and Lemont WRPs
NPDES Permit No. IL0028061 and IL028070
CSO Representative Monitoring and Reporting Plan
April 10, 2006
Rev. April 21, 2006
Rev. December 15, 2008
Rev. December 1, 2009
Rev. December 1, 2010
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In accordance with Special Conditions (SCs) 10.11 and 14.11of the Calumet and Lemont National Pollutant Discharge Elimination System (NPDES) Permit Nos. IL0028061 (effective March 1, 2002) and IL0028070 (effective February 1, 2008), the following plan is being submitted for monitoring the frequency and duration of the discharge from select, representative CSO outfalls authorized in the permits and for all other CSO outfalls connected to TARP, for which the Metropolitan Water Reclamation District of Greater Chicago (District) has the ability to monitor through telemetry.
The 52 CSO outfalls listed below will be monitored as required in SCs 10.11 and 14.11. They include all CSOs for which the District has the ability to monitor through telemetry. This list has been updated to account for multiple outfalls associated with each dropshaft/TARP structure.
The District will document the frequency and duration of CSOs through the outfalls listed below along with an estimate of storm duration and total rainfall for each storm event. The District will continue to monitor these designated CSO outfalls at all times unless the telemetry is out of service due to malfunction or routine maintenance. The results of the monitoring will be submitted to the IEPA on a quarterly basis: February 15, May 15, August 15, and November 15.
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