4 The terms "pollute" and "waters" are expansively, defined in the Dictionary to the PEO Act. Additionally, the evidentiary provisions contained in ss 257 and 258 of the PEO Act deem the Defendants as co-licensees under the PEO Act to be the occupiers of the licensed premises from which pollution occurs "to have caused the pollution".
5 Section 123 of the PEO Act prescribes a maximum penalty of $250,000 where the offence is committed by a corporation.
6 Each Defendant has pleaded guilty to the offence charged and by consent the hearing on sentence in respect of each charge was conducted concurrently. As will appear the hearing, which was considerably facilitated by the joint tender of an Agreed Statement of Facts (Exhibit 1), yielded only one significant difference in the competing cases.
7 That single difference however raised an important matter of sentencing principle in the present cases where the Defendants are clearly co-offenders in the sense that each Defendant was a principal offender but where each offence was committed by the agency of the Joint Venture, which is not a separate legal entity and hence cannot be charged with the offence with which each principal is charged.
8 The Prosecutor submitted that the penalty to be imposed upon each Defendant should be determined independently of the penalty imposed on the other (except for application of the parity principle which on the facts of the present cases would require equality of penalty since the culpability of each Defendant is indistinguishable one from the other).
9 The competing submission of Senior Counsel for the Defendants was that having regard to the Joint Venture, the penalty to be imposed upon each Defendant should be determined by first determining the appropriate penalty for the water pollution incident founding each offence having regard to its objective gravity and thereafter by allocating 50 percent of that penalty to each Defendant having regard to the indistinguishable culpability of each Defendant.
10 Since the competing submissions were made without either elaboration or citation of supporting authority I invited the parties to make further considered submissions on the disputed question.
11 Thereafter the parties filed further written submissions supported by citation of relevant case law. Although the result of these further submissions (supported by evidence of the terms of the Joint Venture Agreement) appeared to bring the parties' respective positions into much closer alignment than had been the case at the hearing, nonetheless at the end of the argument what should be the appropriate sentencing principle to be applied in the present cases remained in doubt.
12 It will be necessary to return to this matter after I have recorded the relevant facts.
B. THE RELEVANT FACTS
13 The relevant facts concerning the admitted offences, the circumstances in which the water pollution incident occurred, the environmental consequences of the water pollution incident and the clean up action taken by the Defendants are found in the Statement of Agreed Facts (Exhibit 1).
14 Additional evidence in mitigation of penalty was given by Mr Stephen Burns, Project Director for the Joint Venture.
15 The following abbreviated summary of relevant facts is extracted from the Statement of Agreed Facts.
16 In July 2002 the Joint Venture was awarded by the NSW Government's Transport Infrastructure Corporation the contract for the construction of the Epping to Chatswood component of the Parramatta Rail Link Project. The contract required the design and construction of two tunnels, each 13 kilometres in length, and 4 railway stations.
17 In order to undertake the contract works the Defendants were granted as joint licensees an environment protection licence (No.11735) under the PEO Act which specifies over 60 sites in and about the suburbs of Epping, Macquarie Park and Chatswood as relevant "premises" to which the licence applies.
18 As part of the contract works, water treatment plants (WTPs) were required to be installed for treating sediment laden waters including ground water and construction generated water and in 2002 the Joint Venture commissioned Liquitek Pty Ltd (Liquitek) to design, supply, install and commission 2 WTPs, one of which was located near Wicks Road Macquarie Park (the Macquarie Park WTP) from which the pollution incident emanated.
19 The Macquarie Park WTP was designed to receive waste waters generated by the construction process and treat them by way of settlement and chemical treatment (by applying caustic soda and a flocculent) before being discharged into Porters Creek via the licensed discharge point. (The licence does not permit discharge of any pollutant containing phosphorous or nitrogen).
20 At approximately 10.15am on 27 October 2003 Joint Venture personnel became aware that a discharge of white sludgy liquid into Porters Creek was occurring from the premises otherwise than via the licensed discharge point. Thereupon environmental officers of the Joint Venture took action by placing sandbags and geofilter fabrics in Porters Creek to prevent the sludge from flowing further downstream. The Environment Protection Authority was informed of the incident and one of its officers, Mr Gathercole, attended the site, made relevant observations, took photographs and collected samples of the discharge and the waters of Porters Creek upstream and downstream the point of discharge into it.
21 Prior to Mr Gathercole's arrival the Joint Venture had engaged a remediation company to remove the pollutants and sludge from Porters Creek and from the bunded area around the WTP.
22 The following day Mr Gathercole again attended the site and made observations of Porters Creek. He was satisfied that the clean up undertaken by the Joint Venture had been effective.
23 According to paragraph 4 of the Statement of Agreed Facts the cause of the pollution incident was as follows: