Abstract Title

Session S-06C: Water Quality III

Keywords

Water Quality

Start Date

1-5-2014 1:30 PM

End Date

1-5-2014 3:00 PM

Description

Metro Vancouver's Integrated Liquid Waste and Resource Management Plan (ILWRMP) states that no new combined sewers will be constructed, and that existing combined sewers will be separated into storm and sanitary sewers via infrastructure replacement or sewer capacity upgrading programs. The ILWRMP also requires prevention of wet weather SSOs for 24 hour storm events of less than 1 in 5 years, outlines a commitment to characterize the quality of CSO and SSO discharges and assess their impact on the receiving water bodies. Samples for both CSO and SSO monitoring programs are collected using automated samplers, triggered by a supervisory control and data acquisition system (SCADA), based on wastewater system levels. For CSOs and SSOs sample collection is done during or just prior (respectively) to the initial discharge with the intent of capturing the first flush when levels and loadings of contaminants are highest and represent worst case scenarios. CSO and SSO quality are characterized through analyses of samples for bacteriology, physico-chemical constituents and toxicity. Parameters are selected based on their potential presence in wastewater at levels of concern, usefulness as indicators of ecological or human health impacts, or are required for consideration of potential mitigation actions. The monitoring information is further used in human health and ecological risk assessment. The findings of the risk assessment are used for negotiation with the regulators and prioritization and design of mitigation infrastructure when required.

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May 1st, 1:30 PM May 1st, 3:00 PM

Metro Vancouver Region's Combined Sewer and Sanitary Sewer Overflows Monitoring and Risk Assessment

Room 606

Metro Vancouver's Integrated Liquid Waste and Resource Management Plan (ILWRMP) states that no new combined sewers will be constructed, and that existing combined sewers will be separated into storm and sanitary sewers via infrastructure replacement or sewer capacity upgrading programs. The ILWRMP also requires prevention of wet weather SSOs for 24 hour storm events of less than 1 in 5 years, outlines a commitment to characterize the quality of CSO and SSO discharges and assess their impact on the receiving water bodies. Samples for both CSO and SSO monitoring programs are collected using automated samplers, triggered by a supervisory control and data acquisition system (SCADA), based on wastewater system levels. For CSOs and SSOs sample collection is done during or just prior (respectively) to the initial discharge with the intent of capturing the first flush when levels and loadings of contaminants are highest and represent worst case scenarios. CSO and SSO quality are characterized through analyses of samples for bacteriology, physico-chemical constituents and toxicity. Parameters are selected based on their potential presence in wastewater at levels of concern, usefulness as indicators of ecological or human health impacts, or are required for consideration of potential mitigation actions. The monitoring information is further used in human health and ecological risk assessment. The findings of the risk assessment are used for negotiation with the regulators and prioritization and design of mitigation infrastructure when required.