Licence conditions for pollution studies and reduction program


  

Licence conditions for pollution studies and reduction programs

Summary
 
Licence number: 378
Title: Pollution Study: Lane Cove River stormwater ingress investigation
Start date: 28 Jun 2017
 
Licence Condition
The objective of this Pollution Study is to require the licensee to undertake a scientifically rigorous investigation (including sewer flow gauging, direct measurement of inflow at sewer openings and refinements to hydraulic sewer system modelling) to identify the magnitude and sources of stormwater ingress into the wastewater system in the Lane Cove River catchment. This is to inform consideration of whether a program of targeted stormwater ingress source control works would be effective in reducing the impacts of wet weather sewage overflows on the environment and community. The study must include areas where source control is most likely to be effective based on existing data.
The licensee must develop a draft project plan for the investigation that allows the licensee to meet the objective and scope stated in U5.1 and which clearly outlines (and provides justification for) the project background, scope, methodologies (monitoring, modelling and statistical) and timeframes. The licensee must submit the draft project plan to the EPA within 10 weeks of this Pollution Study being issued.
The licensee must finalise the project plan by addressing any written comments provided by the EPA and resubmit it to the EPA for approval within three weeks of receiving such comments.
The licensee must undertake the investigation in accordance with the objective and scope outlined in U5.1 and the methodology and timelines in the EPA approved project plan (or any revisions to the project plan approved by the EPA in writing) and submit a detailed draft report on the investigation to the EPA by 30 September 2018 which must include (but not be limited to): An introduction and background Description of methodologies used (including monitoring, modelling and statistical) Description of assumptions used in, and limitations of, the investigation Results, including analysis and interpretation of results to provide an assessment of:         o  Percentages of total rainfall entering the wastewater system;         o  Proportions of ingress attributed to infiltration and inflow; and         o  Proportions of ingress entering through private and public assets. Detailed analysis and discussion of results, including (but not limited to) analysis of the benefits that could be achieved (in estimated reductions in overflow frequency and volume) in the study area through a range of source control options, including but not limited to:         o  reducing stormwater inflow to the Sydney Water sewer;         o  reducing stormwater infiltration to the Sydney Water sewer;         o  reducing stormwater inflow to private sewers;         o  reducing stormwater infiltration to private sewers; and         o  a combination of these and any other identified options. Conclusions, including recommendations for a targeted program of source control works to reduce the impacts of wet weather overflows on the Lane Cove River, where it is considered that this would be effective.
The licensee must finalise the draft report by addressing any written comments provided by the EPA and resubmit it to the EPA within four weeks of receiving such comments.
The licensee must submit written progress reports to the EPA in December 2017 and April 2018, which must include (but not be limited to): A summary of any investigations, plans, works and other activities that have been undertaken to meet the objective and scope of this Pollution Study as stated in U5.1; and Tracking of progress against the timeframes included in the approved project plan towards meeting the objectives and timeframes of this Pollution Study.
In addition to the reporting requirements of condition R5.6, the licensee must submit with each Annual System Performance Report: Details of any investigations, plans, works and activities that were undertaken as part of this Pollution Study during the reporting period; and An outline of progress toward achieving the objectives of this Pollution Study
Note: A Pollution Reduction Program is intended to be included on the licence for implementation of abatement works based on the outcomes of this Pollution Study.