Licence conditions for pollution studies and reduction program


  

Licence conditions for pollution studies and reduction programs

Summary
 
Licence number: 21037
Title: Erosion and Sediment Control Asessment
Start date: 14 Dec 2020
 
Licence Condition
The licensee must engage an independent and appropriately qualified Expert to undertake an Erosion and Sediment Control Assessment. The objective of assessment is to identify measures to improve the effectiveness of erosion and sediment controls and reduce the potential concentrations of suspended solids discharged from the premises.
The Expert must be a suitably qualified person, not previously engaged by the project, with 10+ years’ experience in soil and erosion sediment control and currently registered as a Certified Professional Erosion and Sediment Control.
The Erosion and Sediment Control Assessment must evaluate the site conditions and erosion and sediment control measures and make recommendations to improve the effectiveness of these measures. The assessment must include, but is not limited to: (a) Identification and mapping of soil management catchments across the premises. (b) Undertaking soil sampling across each soil catchment to characterise the soil nature of the premises soil. Soil characteristics that should be quantified include; soil erodibility factor; particle size analysis; exchangeable sodium percentage, Emerson Aggregate Test; dispersion percentage; soil type (C, D, F); and any other relevant soil characteristics. (c) Undertaking an erosion risk assessment for the project using Revised Universal Soil Loss Equation values derived from the data collected under condition U1.3(b) for each soil catchment. (d) Quantification of the volume of the cemetery sediment basin (Basin ID #2), Ingleside Road sump (Basin ID #4), any water retention structure that the licensee discharges from in accordance with the licence and/or has been constructed in accordance with the Blue Book (Landcom 2004). The volume must be measured and calculated by an appropriately qualified and experienced engineering surveyor. (e) Identification of receiving waterbodies and high-risk areas for erosion, sedimentation and sediment laden surface water runoff to leave the premises boundaries. (f) Assessment of suitability of the current erosion and sediment controls to manage the soil as per characteristics identified under conditions U1.3(b) and U1.3(c). This must include a review of the temporary clean water diversion controls, application of temporary surface treatments (such as soil binders) at the site, stockpile management processes and water retention controls. (g) Recommendation of additional and/or improved erosion and sediment control measures suitable for management of the soil, as characterised under conditions U1.3(b) and U1.3(c), that could be implemented at the premises. Recommendations must include, but are not limited to: 1. Erosion and sediment controls that should be in place based on the severity of forecast rainfall events (for example measures to be deployed for forecast rainfall of <10mm, 10-20mm, 20-35mm, and +35mm over a consecutive 5-day period); 2. A map-based erosion and sediment control plan (ESCP) demonstrating the measures that will be in place at each location along the premises; and 3. Erosion and sediment controls suitable to manage both current and future activities at the premises.
The licensee must submit the Erosion and Sediment Control Assessment in a report to the EPA by 29 January 2021.
The EPA intends to use the findings and recommendations in the report to develop EPL conditions requiring the licensee to implement measures to improve the effectiveness of erosion and sediment controls at the premises.