30 The defendants submitted that the uncontradicted evidence was that the first offence occurred on 8 December 2006. Mr Ngo had never washed the truck in Spencer Lane before that day. Accordingly, all of the evidence about what system for truck washing was in place before that day was largely immaterial. Whatever the system was it was lawful. Mrs Kim Thu Nguyen had very poor English (her evidence, as with that of Mr Ngo, was given through an interpreter). She had no education and could not communicate abstract concepts. Hence, the difficulties the defendants' counsel had in obtaining instructions about the system (leading to the confusion about wash facilities and what was done) could not be used against the defendants. According to the defendants, Mr Ngo's evidence about being told on the morning of 15 December 2006 to wash the truck in Spencer Lane was inconsistent with his evidence about a conversation in November 2006. The fact that the defendants cannot explain why Mr Ngo did what he did, they submitted, does not alter Mrs Kim Thu Nguyen's evidence in which she consistently denied any instruction. Her evidence on that essential issue was consistent and credible. The defendants did not have to disprove any aggravating factor. The Council had to prove any such factor beyond reasonable doubt. Further, the defendants submitted the fine has to be proportionate. In Environment Protection Authority v Abigroup Contractors Pty Limited [2007] NSWLEC 712 a very large company was required to pay $32,000 (reduced to $20,000) for an offence causing substantial actual harm to bushland. A similar penalty in this case, the defendants said, would be disproportionate given the defendants' limited means to pay. TT Rubbish Removal carried out an environmentally useful activity. Mrs Kim Thu Nguyen had taken steps to ensure the offences were not repeated. A heavy fine would close the business down and place three employees out of a job. It would deprive Cabramatta of a garbage collection service. The Council had brought 24 charges relating to this incident. The costs the defendants had agreed to pay ($68,527.51) were very high and would be a very substantial burden to the defendants. Taking into account all those circumstances and the early plea the defendants said the fine should be in the order of $4000 to $5000.