Licence conditions for pollution studies and reduction program


  

Licence conditions for pollution studies and reduction programs

Summary
 
Licence number: 837
Title: PRP U28: Stormwater management system upgrade
Start date: 06 Nov 2023
 
Licence Condition
During a period of heavy rainfall, on 7 April 2022 the waste water treatment plant at the premises was flooded causing hydrocarbon contamination to rise out of the separators and sumps and mix with the stormwater. The hydrocarbon contaminated stormwater then travelled off the premises and spilled to locations including but not limited to Captain Cook Drive and Solander Street, impacting the surrounding environment and Kurnell community. Ampol has identified a series of upgrades to the stormwater management system at the premises, which it predicts will prevent a similar incident from reoccurring. These upgrades, which were presented to the EPA, are primarily designed to: Provide upstream retention of stormwater to mitigate the risk of overland flow and flooding of the waste water treatment plant; and Maintain segregation between stormwater and oily water systems at the waste water treatment plant. This PRP requires Ampol to implement the proposed upgrades to the stormwater management system to prevent stormwater from the waste water treatment plant area transferring hydrocarbon contamination offsite.
Unless otherwise agreed in writing by the EPA, the licensee must: 1.  By 31 December 2024 install a levee wall around the waste water treatment plant including the separator bays, retention basin and wet/oil pits, to prevent flooding and hydrocarbon loss of containment during periods of high rainfall. The levee wall must be designed such that it would prevent the loss of hydrocarbons in a 1 in 500 year flood event. 2.  By 31 December 2024 construct and install:       a) A new stormwater retention pit at the low point of pipe way A, with an automated pumping system to divert stormwater from the retention pit to bund 602 for storage during periods of high rainfall;       b) A new stormwater retention pit at the low point of pipe way B, with an automated pumping system to divert stormwater from the retention pit to bund 623 for storage during periods of high rainfall;       c) A new automated pumping station at the B1A basin to divert stormwater to bund 622 for storage during periods of high rainfall; and       d) A new automated pumping station at the intermediate separators to divert stormwater from the intermediate separator to bund 602 for storage during periods of high rainfall. Note: Bund 602, bund 623 and bund 622 must be designed such that any water stored in these areas will eventually drain to the waste water treatment plant for treatment prior to being discharged from the premises. 3.  By 31 December 2024 install new automation controls on the existing pump at MH72 oily water sewer. 4.  By 31 December 2024 provide to the EPA a procedure that outlines the new stormwater systems processes of training, maintenance and procedures during heavy rainfall.
Unless otherwise agreed to in writing by the EPA, the licensee must submit a monthly report detailing progress on the Stormwater Management System Upgrade project required by condition U2.2. The report must include, but not necessarily be limited to, the following: 1.  a brief narrative on the progress of the project; 2.  photographs of construction work completed; and 3.  a description of any anticipated or actual risks to the project timeline and the measures being implemented to mitigate those risks. The report must be submitted electronically once a month. This reporting requirement will begin 1 month after the Development Application for the Stormwater Management System Upgrade Project is approved by the relevant consent authority.
The licensee must notify the EPA in writing of the completion of each condition under U2.2.
Unless otherwise advised in writing by the EPA, by 30 June 2025 the licensee must adequately test all new stormwater systems upgrades under condition U2.2 to confirm they are functioning correctly and provide a report to the EPA that summarises the outcomes of the testing.