HomeMy WebLinkAbout6.a. 2015 Water Quality Monitoring Program � ROSEMOLINT EXECUTIVE SUMMARY
UTILITY COMMISSION
Utility Commission Meeting: February 22, 2016
AGENDA ITEM: 2015 Water Quality Monitoring Program AGENDA SECTION:
New Business
PREPARED BY: Patrick Wrase, PE, Director of Public AGE DA NO.
Works / City Engineer �� a,
ATTACHMENTS: 2015 Water Quality Monitoring Program APPROVED BY:
Summary; Monitoring Locations Summary
RECOMMENDED ACTION: Receive Presentation and Discussion Regarding the
2015 Water Quality Monitoring Program
BACKGROUND
The 2015 Water Quality Monitoring Program has been completed as proposed in Task 4 of the 2015
Municipal Separate Storm Sewer System (I�1S4) General Services contract. �s part of the annual monitoring
effort, a summary memo is provided with the preliminary results for observed stormwater runoff volumes
(rainfall-to-runoff rarios), estimated volume reductions associated with evaporation and infiltration values,
and pollutant removal performance estimates based on water qualiry samples for the ten (10) selected basins
within the City. This monitoring effort is an extension of a monitoring program that was commenced in
2007 and has been conducted 7 of the last 9 years.
The water quality monitoring program is used to fulfill multiple program requirements in Minitnum
Control Measures (NICMs) 5 and 6 of the City's General MS4 Permit related to inspection, long-term
operation, and maintenance of infiltrarion B1�ZPs. The water qualiry monitoring program also provides the
City with empirical data that will assist with:
• Guiding upcoming Watershed and City Stormwater Plan Updates and discussions with observed
runoff volumes and infiltration and evaporation rates
• Identify potential areas to receive regional volume reduction credit through stormwater reuse
applications.
• Validating pond treatment efficiencies from the Storm Water Asset Management Program
(SWAMP) with sampled Total Suspended Solids and Total Phosphorus concentrations.
• Supporting conclusions in the City's Non-Degradation study with observed infiltrarion and
evaporation data.
• Create a baseline for discharge volumes and pollutant loading assumptions of possible future Total
Maxirrium Daily Loads (TI�1DLs) in the Verinillion and I�lississippi River.
• Assess winter pollutant concentration associated with snowmelt runoff.
This water qualiry monitoring program is intended to align with the 1�1S4 General Permit cy cle. Data is to
be processed annually and a final report is planned to be complied at the end of the Year 5 period (2018).
G:A�1ti-t Pczmit\Council and Commission Itcm,\20160222 UC �fS4 2015 Rcpoct.docx
SUMMARY
WSB Staff will be in attendance to provide a presentarion and answeY quesrions related to the 2015 Water
Quality Monitoring Program Staff and to discuss future MS4 related issues.
G:Ati[ti4 Vcrmit\Council and Commission Itcm,\20160222 UC �fS�M1 2015 Rcport.docx