Licence conditions for pollution studies and reduction program


  

Licence conditions for pollution studies and reduction programs

Summary
 
Licence number: 837
Title: PRP U27: Stormwater Pipe Investigations and Rectifications
Start date: 13 Oct 2023
 
Licence Condition
Background: As an outcome of PRP U26: Monitoring Program for the Ampol Wharf Drain Investigation, the licensee has investigated and identified a damaged area/s in the stormwater pipe network receiving hydrocarbons from an unidentified source. That is, stormwater pipe infrastructure upstream of the triple interceptor on Road C, near Gate 5 of the premises. The hydrocarbons in the stormwater are leaving the premises at low concentrations and appear to contribute to the generation of hydrocarbon odours which move beyond the premises boundary under certain conditions. The licensee has advised the EPA that re-lining sections of this pipe network is likely to prevent the inflow of hydrocarbons. Objective: The objective of this program is to:   i.  complete stormwater pipe re-lining works in an attempt to reduce hydrocarbon concentrations in stormwater discharges and monitor the success of these works;   ii.  assess feasible measures to remove the hydrocarbons from the stormwater discharges; and   iii.  if necessary, undertake an assessment of further options to reduce hydrocarbons in stormwater discharge and any odours generated as a result.
Stormwater Pipe Investigations and Rectifications Requirements: Unless otherwise agreed in writing by the EPA, the licensee must commence or complete the following requirements by the specified dates. The licensee must engage a suitably qualified and experienced person/s to undertake the following: 1.  Pipeline Re-lining and Repair Works Stage 1: By 30 November 2023, commence the repair of damaged stormwater pits in the stormwater drainage system between SW11 and SW14 to prevent contaminated water ingress. Stage 2: By 31 March 2024, commence the re-lining of the mains for the stormwater drainage system between SW11 and SW14 or upon the delivery of the liner materials from the international supplier should delivery delays be incurred. 2.  Hydrocarbon Monitoring Program To assess the water quality data prior, during and after U1.2.1 Pipeline Re-Lining and Repair Works, hydrocarbon monitoring must be undertaken including, but not be limited to location SW15, which is positioned upstream of the right-of-way pit near Prince Charles Parade (SW12) and downstream of the triple interceptor at Gate 5 (SW11). The hydrocarbon monitoring must be conducted: for at least two rounds on a weekly basis prior to the commencement of U1.2.1 Pipeline Re-lining and Repair Works; for at least two rounds after Stage 1 – repair of stormwater pits and prior to Stage 2 – re-lining of stormwater mains; and for at least three rounds after the completion of Stage 2 – re-lining of stormwater mains. 3.  Stormwater Treatment System Assessment Provide an evaluation of options that led to the decision of re-lining the critical section of the stormwater system. The assessment must demonstrate the decision-making process and include a high-level evaluation of a range of options (e.g., a flowceptor). In the event the PRP U1.2.1 Pipe Re-lining and Repair Works do not reduce hydrocarbon concentrations in stormwater discharges, the EPA may also require assessment of other options to reduce hydrocarbons and odours in stormwater discharges such as: a)  measures for diverting stormwater to avoid surfaces or sections of the stormwater system that may introduce hydrocarbon contamination into the stormwater; b)  measures to control or contain hydrocarbons at the source (i.e., avoiding the generation of contaminated water or reducing the volume of contaminated runoff); c)  measures for preventing odorous air from exiting out of the wharf drain (SW13); and d)  captures of contaminated stormwater for onsite treatment or storage for offsite disposal or discharge to sewer (subject to a trade waste agreement). 4.  Reporting The licensee must provide the EPA, in writing: a)  By October 2023, commence PRP U1.2.2 Hydrocarbon Monitoring Program. b)  By 30 December 2023, submit a report on the outcome of PRP U1.2.3 Stormwater Treatment System Assessment. The report must provide an evaluation of options that led to the decision of re-lining the critical section of the stormwater system. c)  On the fifth business day of each month, commencing in November 2023, a report providing a progress update for the U1.2.1 Pipeline Re-lining and Repair Works. The report must include a description of any anticipated delays / risks to the Proposed Work Schedule outlined in Table 1 of WSP’s letter to the EPA dated 29 September 2023. d)  6 weeks after the receiving of final laboratory results, a report on the findings from the PRP U1.2.2 Hydrocarbon Monitoring Program demonstrating the effectiveness of the pipeline re-lining and repair work under PRP U1.2.1. 5.  Community Updates The licensee must provide the Kurnell community with updates on the progress of the pipeline re-lining and repair works via Ampol’s monthly Kurnell Community Update Newsletter.