2 The Defendant has pleaded guilty and has therefore admitted the essential elements of this offence. The offence is one of strict liability so that mens rea is not an element of the offence.
3 The maximum penalty applicable to offences under s 64(1) of the POEO Act is $1 million for a corporation. The penalty for this offence was increased to $1 million from $250,000 in May 2006.
Background
4 The Defendant is a statutory state owned corporation incorporated under the State Owned Corporations Act 1989. It has all the powers and responsibilities of a natural person. The Defendant is a "public authority" for the purposes of the POEO Act. The Defendant is a wholesale electricity generator. The Defendant holds Environment Protection Licence number 766 (the licence) relating to the Mt Piper Power Station located at 350 Boulder Road, Portland NSW and WPS located at 1 Main St Wallerawang NSW. The licence includes the Kerosene Vale Flyash Repository (the KVAR). Flyash is a by-product of burning coal for electricity production.
5 The parties usefully agreed to a lengthy Statement of Agreed Facts (the SOAF). The essential elements of this are as follows:
Accepted Methods of Managing Ash
29. Flyash particles are spherical in nature and range in size from around 10 microns to over 100 microns with most particles being between 25 and 75 microns.
30. Accepted methods of minimising or preventing dust emissions from flyash repositories include the following:
· Ensuring that any exposed areas of flyash remain moist, typically through the use of sufficient numbers of sprinklers and/or water carts and/or water cannons to maintain sufficient moisture content to stabilise the flyash.
· Compaction and wetting of the flyash once it is emplaced.
· Covering exposed areas of flyash with a temporary cap, being a material that is more stable than flyash ("temporary capping"). Temporary capping is a coating on the ash and dust in areas where works are not complete. This normally consists of a sprayed on coating of lignosulphate or tar and, when required, dust can be loaded on top of this capping.
· Where the area has reached the limits of its boundaries it is covered with material that can promote natural growth as well as being supplemented with flora to reduce environmental and visual impact ("permanent capping").
View of Area Surrounding the KVAR from the Mound
31. The KVAR is located to the east of the township of Lidsdale. Parts of the Mound are visible from the township of Lidsdale.
32. From on top of the Mound, it is possible to see to the north west and south west for several kilometres. From the top of the Mound a small section of the outskirts of Lidsdale can be seen. Mountain ranges obstruct the view in all directions other than from the south to north west.
Operations at the KVAR
33. From February 2003 Delta contracted out the operation of the KVAR to other parties including MPA Energy Services Pty Limited (the "prior contractor").
34. Subsequently Delta ended the contract with the prior contractor and contracted Thiess Services Pty Ltd ("Thiess") to operate dust disposal at the Mound from 1 August 2006 to 30 November 2008, with options to continue from 1 December 2008 to 31 July 2013. Delta has decided not to exercise this option and the contract was terminated in November 2008.
The Contract
35. …
36. The terms of the agreement were set out in a pre-tender document. The pre-tender document was adopted as the basis of the contract between Delta and Thiess (the "Contract").
37. At Volume 1 clause 3.1(a) the Contract required Thiess to be responsible for the operation and maintenance of the KVAR.
38. At Volume 1 clause 3.1(d) the Contract required Thiess to develop a Site Repository Management Plan for the KVAR (the "Management Plan").
39. At Volume 1 clause 4.1 the Contract required Thiess to be responsible for the operation and maintenance of the flyash and dust system at Wallerawang Power Station.
40. Volume 1 clause 4.4 of the Contract required Thiess to be responsible for all aspects of flyash management such as repository management including dust control, environmental controls, bunds and retaining walls, temporary capping, permanent capping and a Site Repository Management Plan.
41. Volume 3 clause 5 of the Contract provides Delta with full access to the premises for the purposes of environmental audit and inspection.
42. Volume 3 clause 14 of the Contract purports to make Thiess responsible for ensuring all of the Licence conditions are met including those in relation to the flyash and dust Power Stations.
43. Volume 3 clause 17 of the Contract requires Thiess to provide a monthly operation plan to Delta. It also provides that Thiess is required to attend a weekly coordination meeting with Delta and report on the previous week's operational performance. It also provides that Thiess is to communicate daily with Delta to review the status of operations compared to the weekly operational plans and to coordinate any necessary adjustments.
44. Volume 1 clause 4.6(j) of the Contract provides that the approval to operate the KVAR is based on the Review of Environmental Factors.
45. Volume 1 clause 44 of the Contract sets out grounds for default of the Contract, whereby Delta can request Thiess to "show cause" with a view to terminating the Contract where Thiess defaults by a substantial breach, such as failing to maintain the Flyash and Dust Handling Systems under the provisions of the Contract.
46. Volume 1 clause 15 of the Contract provides that in the event that Thiess fails to fulfil its obligation under the Contract to protect the environment or prevent a nuisance, Delta can perform the obligation on Thiess' behalf and recover the cost incurred in doing so.
47. Thiess' tender for the Contract was in the amount of $7, 613, 600 for the first period and $21,812,160 for the period 2006 to 2013. In the tender Thiess estimated that flyash management would amount to $3,539,860 over the first 28 month period.
48. …
The Management Plan
49. …
50. Some relevant parts of the Management Plan provided in accordance with clause 3.1(d) of the Contract are:
· Section 1.0 Appendix A - Organisation Charts identifies that 2 men will work at the KVAR during the day.
· Section 3.0 identifies compliance with Part 3 of the Licence as a key requirement.
· Section 3.4.1 identifies that Delta is responsible for the implementation of all licences and permits relating to the workplace which Thiess will operate.
· Section 3.7.2 identifies that a water cart and sprinkler system shall be used to minimise flyash and dust emissions from the KVAR. Thiess supervisor staff are to monitor KVAR operations daily to ensure that flyash and dust generation is minimised and appropriate suppression measures implemented as necessary.
· Section 3.16.2 sets targets for air quality and section 3.16.5 for compliance with the Licence.
· Section 3.16.11 refers to sprinklers and a water cart as methods of managing dust and flyash - performance targets include no non-conformance from Delta and no complaints from neighbours.
· Section 7.0 sets out the management plan for the KVAR.
· Section 7.3 contemplates permanent capping at a minimum of once per year with fast growing grasses as a management strategy.
· Section 7.4.2 sets out the method of placement and compaction of flyash, focussing on the addition of water to flyash on the working face. The working face is to be minimised in area as far as practicable. Filling is to be undertaken progressively to the finished level commencing at the western portion of the Mound and extending in an easterly direction. Capping takes place in a staged manner.
· Dust control is set out in section 7.4.4.
· Section 7.4.7 states that daily inspections are required with the results to be recorded on a daily inspection form.
Staff at the KVAR
51. From late November 2006 until June 2007 there:
· were approximately 2 truck drivers per shift who would deliver ash to the Mound.
· were 2 Mobile Plant Operators. Mr Ray Driscoll and Mr Bret Dobel performed the role on a rotating 5 days on, 5 days off, 2 days on, 2 days off basis.
· was a full time Water Cart Operator. This role was performed by Mr Willy Wright until the role was terminated in or around June 2007. Delta was not made aware the role was terminated.
· was a site manager responsible for the Mound. The site manager was based at the Wallerawang Power Station and Delta expected that he would spend 50% of his time on the Mound. The site manager was responsible for the operation, maintenance and overall management of the Mound.
52. Thiess staff were on site at the ash plant 7 days a week, in accordance with the rotating roster described in paragraph 51.
Duties Performed by the Water Cart Operator
53. The Water Cart Operator's role was generally to operate the water cart at the KVAR in order to wet down the ash and thereby assist in minimising dust emissions, and to compact the ash by driving over it to ensure the structural integrity of the Mound.
…
61. Around June 2007 the Water Cart Operator was terminated. Delta was not notified that the Water Cart Operator had been terminated.
62. Arrangements were in place before the Incident for a dedicated Water Cart Operator to commence work the week following the Incident for 4 hours per day in conjunction with the Mobile Plant Operator.
Duties Performed by the Mobile Plant Operator
63. …
64. In general, the Mobile Plant Operator would work from 6:00 am to 6:00 pm. The Mobile Plant Operator would commence work at the Wallerawang Power Station before travelling to the KVAR.
65. …
66. One of the main duties performed by the Mobile Plant Operator was pushing, rolling and cutting flyash. The process of pushing, rolling and cutting involved using an articulated M380 Michigan loader/pusher to push, or spread out, piles of flyash that had been previously dumped by trucks. If the flyash had sufficient moisture content when it was pushed it would adhere so that it effectively rolled as it was pushed. The M380 Michigan loader/pusher was also fitted with a either a 3.5 metre or 5 metre blade which was used to cut, or level off, the flyash that had been spread out.
67. The M380 Michigan loader/pusher was fitted with rubber tyres, so that the process of pushing, rolling and cutting would compact the flyash quite firmly. The M380 Michigan loader/pusher weighs around 65 to 70 tonnes.
68. When the freshly cut flyash was irrigated it would form quite a hard crust. Generally the crust remained stable whilst there was moisture present. It was most stable after recent rain. However, in dry or windy conditions the top layers of the crust would dry out and emit dust if not capped or under irrigation.
69. When [sic] at the KVAR the Mobile Plant Operator would commence by pushing the loads that had been dumped during the night.
70. It was the priority to push the flyash dumped from the previous night to make room for the further deliveries throughout the day.
71. Depending on the length of the working face it generally took about 3 hours to push the flyash dumped from the previous night.
72. In combination with pushing, rolling and cutting the Mobile Plant Operator also had to 'cut' the access track to the top of the Mound to allow flyash trucks to access the top of the Mound. The Mobile Plant Operator also had to service the lighting towers and refuel the vehicles.
73. After about June 2007 the Mobile Plant Operator was also required to take over the duties of the Water Cart Operator. According to the Mobile Plant Operator he did not have sufficient time to perform his usual duties as well as the duties of the Water Cart Operator.
Supervision of the Contract by Delta
74. Delta reserved the right to interview and approve the employment of a site manager for the KVAR by Thiess.
75. Delta supervised Thiess' performance of the Contract at the KVAR through the daily presence of a Delta employee, Mr Phil Day, at the KVAR.
76. Mr Day was the contract administrator for the KVAR and the nearby Mt Piper Ash Repository.
77. Mr Day would attend on Mound on a daily basis to ensure Thiess was undertaking the job as stipulated in the contract.
78. Mr Day was in contact with Thiess 3 to 4 times per day regarding the management of the KVAR. Mr Day inspected the KVAR on a daily basis, and up to 3 times per day, including on weekends, to ensure that there were no dust emissions. During these inspections Mr Day would review the condition of the entire KVAR, and have regard to the location and number of sprinklers at the KVAR as well as to the water cart. Mr Day would inspect the KVAR by driving around it in a utility vehicle and also on foot.
79. From time to time Mr Day issued directions, usually orally, to Thiess in respect of aspects of the operation at the KVAR. Mr Day would consult and discuss matters with his supervisor, Mr Peter Reed, the External Plant Asset Manager for Wallerawang and Mt Piper Power Stations.
80. Mr Michael Jansen, a Delta employee, conducted a monthly environment review of activities at the KVAR (the "monthly audit") which involved inspecting the dust control measures in place in accordance with an established checklist. Issues arising from the monthly audit regarding the KVAR were raised with Mr Day, emailed to Thiess and also raised with Mr Reed.
81. …
Prior Problems with Dust Emissions at the KVAR
82. Mr Driscoll raised hazard reports to the Thiess site manager regarding dust emissions at the KVAR on days including, but not limited to, those listed below:
a) 18 July 2007
b) 19 July 2007
c) 20 July 2007
d) 21 July 2007
e) 22 July 2007
f) 5 August 2007
g) 9 August 2007
h) 29 August 2007
i) 30 August 2007
j) 31 August 2007
k) 14 September 2007
83. …
84. The hazard reports listed above were provided by Mr Driscoll to Thiess but were not provided to Delta.
85. Mr Driscoll says that on some occasions when he noted there were emissions, Mr Day and Mr Reed were at the KVAR.
86. According to Mr Driscoll he consistently raised the issue of dust emissions at the KVAR during Thiess staff meetings and informed Thiess that he did not have sufficient time to complete his duties as well as operate the water cart. The issues raised by Mr Driscoll in this regard were not recorded in the minutes of any meetings. The meetings were for Thiess staff only and were not attended by Delta employees.
87. In the 2 months before the Incident Delta gave Thiess repeated warnings about the potential for dust to rise off the exposed batters to the north and north-west of the Mound. On occasions Mr Day raised issues with Thiess regarding the placement of sprinklers on the Mound. Thiess assured Delta that the sprinkler set up was functional and being monitored on an ongoing basis.
88. On 4 September 2007 Delta advised Thiess that complaints were made to Lithgow City Council that "the level of dust coming off the repository appears to be out of control". Delta requested confirmation that Thiess were controlling these dust emissions.
Works in Relation to the Mound by the Prior Contractor
89. Generally, the prior contractor would dispose of flyash at the KVAR by first constructing batters from rocky materials and then placing the flyash within the confines of those batters, until the level of flyash reached the level of the batters (the "final height"). This effectively created a flat topped mound of flyash enclosed by rocky sides. The prior contractor would then repeat the process on top of the newly fashioned mound.
Works in Relation to the Mound by Thiess prior to the Incident
90. Thiess did not adopt the same methods for depositing flyash as the prior contractor. Thiess adopted the techniques described in paragraphs 66 to 68 above, effectively depositing flyash on the top of the Mound without first constructing batters. Thiess intended to bring the entirety of the top of the Mound up to a finished height before permanently capping it. A portion of the mound was at the finished height by the end of August 2007.
91. Delta was aware of the method Thiess had adopted for ash placement and Thiess' proposals for capping. Delta raised concerns regarding the method used by Thiess. Delta was aware that the methods used by Thiess were not in line with what the Contract or the Management Plan specified but Delta accepted the methods based upon assurances from Thiess as well as the constant supervisory presence of Mr Day at the KVAR.
Capping Works at the KVAR prior to the Incident
92. As referred to in paragraph 40 above, the Contract contemplated that Thiess would be responsible for the temporary capping and permanent capping of the Mound.
93. The method employed by the prior contractor meant that on reaching the final height the Mound created was already effectively permanently capped other than on top.
94. In November 2006 Thiess submitted a proposal to rectify the steep western batter and to permanently cap the uncapped portions of the Mound, including the north eastern portion.
95. In February 2007 Thiess commenced investigations into using a green material for temporary capping purposes. Thiess did not make the necessary arrangements in a timely fashion to obtain the relevant consents that were required in order to use the green material on the Mound.
96. In February 2007 Delta placed an order on Thiess to rectify the issues arising from the previous contractor. A separate order was necessary because the works were not contemplated as a part of the Contract.
97. In all events Thiess did not perform the works it proposed to do.
98. On 20 August 2007 Thiess requested approval from the Department of Environment and Climate Change (then the Department of Environment and Conservation) ("DECC") to use green material from Katoomba Waste Facility (also operated by Thiess) as a temporary capping material. Three days after receiving the request DECC indicated its approval, noting that Lithgow City Council should also be consulted. Lithgow City Council did not delay the process either. In all events Katoomba Waste Facility disposed of the green waste material elsewhere.
99. Also on 4 September 2007 Delta expressed concern regarding the ongoing 'batterless' method for flyash deposition being used by Thiess, particularly in relation to its visual impact on the town of Lidsdale. Delta requested a plan and timetable to remedy this issue as a matter of urgency. Delta requested that permanent capping be placed on those parts of the Mound facing Lidsdale.
100. In response Thiess promised to supply an action plan with short term and long term solutions by 10 September 2007.
101. Although it was clear that Thiess was responsible for doing the capping, disagreement arose regarding who was responsible for winning the permanent capping material. The issue was resolved on 4 September 2007 by reference to the Contract and Thiess subsequently used capping material which Delta identified.
102. On 12 September 2007 Mr Reed and Mr Day visited the KVAR. As a result of this inspection Mr Reed emailed Mr Glen Hines, Thiess' site manager, regarding the lack of capping at the KVAR.
103. On 13 September 2007 Thiess sent a formal request to Delta for capping material, although Thiess and Delta had been in contact regarding the need for permanent capping material between 4 September 2007 and 13 September 2007.
104. Over the 14 months in which Thiess operated the KVAR until the time of the Incident none of the areas on which flyash was deposited by Thiess were capped, either temporarily or permanently, although the flyash was dealt with in the manner discussed in paragraphs 66 to 68 above.
105. All areas on top of the Mound had flyash deposited on it by Thiess. Some areas of the Mound were 'operational' at the time of the Incident, in that flyash was being actively deposited, pushed, rolled and cut. All other parts of the top of the Mound had not been operational for several months.
Batter Rectification Works at the KVAR prior to the Incident
106. The western batter had been capped by the prior contractor but was steep and high.
107. In November 2006 Thiess submitted a proposal to carry out work on the steep western batter.
108. Mr Driscoll formed the view that there were work safety issues associated with the steepness of the western batter. In about March or April 2007 Mr Driscoll fenced off the western batter because of the work safety issues associated with it.
109. In June 2007 Thiess' geotechnical consultant prepared a risk assessment in relation to the steep western batter. The risk assessment advised that once work was carried out on the batter, it should be permanently capped. In all events Thiess did not perform rectification of the steep western batter.
110. In late August 2007 Delta contracted Henry's Plant Hire to carry out work on the steep western batter. Rectification works involved piling flyash against the steep batter to create a more moderate slope. Henry's Plant Hire completed these works at least 7 days prior to the Incident.
111. According to Delta and Thiess, no specific arrangements were made with Henry's Plant Hire, or Thiess, for capping the new western batter. Minimisation of dust in the area of the new western batter was included in the Contract.
112. On 7 September 2007 Thiess advised Delta of their concerns in relation to the potential of the new section of the western batter to generate dust. Thiess indicated that it would install sprinklers on this section and would potentially have temporary capping material ready the following week to apply to this batter.
113. On 7 September 2007 Delta responded to Thiess' concerns by email stating "Large areas of exposed flyash have not concerned you in the past - Why does this bother you now?"
The Incident
114. High winds were forecast on the morning of Friday 14 September 2007.
115. The temperature was not unusually hot, peaking at 19.2°C (temperatures range from -8°C to 38°C). The winds varied in speed from 3.6 kilometres per hour to a peak of 32.4 kilometres per hour by 2:30 pm, but remained predominantly within the range of approximately 14 to 22 kilometres per hour.
116. Mr Driscoll commenced work at about 6:00 am and arrived at the KVAR some time later. On arrival at the KVAR Mr Driscoll commenced pushing, rolling and cutting flyash deposited the previous night on the southern part of the Mound. Mr Driscoll became aware at approximately 7:00 am that high winds were forecast and unsuccessfully attempted to contact Mr Hines, as Mr Hines was not at the Wallerawang Power Station at that time.
117. Mr Day became aware of a risk of dust emissions from the KVAR at 7:45 am on 14 September 2007. Mr Day then inspected the KVAR. At this time there were sprinklers in operation at the KVAR but Mr Day became concerned that the sprinklers that were present at the KVAR weren't adequate and weren't being moved around and weren't being managed enough to control the drying of ash in that area.
118. Mr Day notified his supervisor, Mr Reed, by email of the risk of dust emissions. After this time staff of Delta attempted to contact Mr Hines by telephone. Several messages were left on his answering machine. The messages were followed up with an email at 10:54 am.
119. According to Mr Driscoll at around 8.00 am, the wind began to pick up, causing visibility problems on the Mound for Mr Driscoll.
120. At approximately 8:45 am Mr Reed attended the KVAR. Mr Reed saw small plumes of dust being emitted from the Mound and falling straight back onto the Mound. Mr Reed saw there was potential for dust to be emitted from the Mound. Mr Reed saw that there were 2 banks of sprinklers installed at the base of the western batter and that the sprinklers were turned on.
121. According to Mr Driscoll, by 9:00 am the dust was obscuring his view.
122. According to Mr Driscoll, visibility was affected on top of the Mound by around 10:00 am or 11:00 am so he requested that the trucks stop dumping flyash on the southern part of the Mound as he could not see where the trucks were going and there was the potential for him and the trucks to either collide or drive over the edge of the batters. Mr Driscoll directed the trucks to start dumping flyash on the northern part of the Mound.
123. At 11:05 am on 14 September 2007 Mr Driscoll made an anonymous complaint using his personal mobile phone to DECC environment line to report the dust problems at the site as Mr Driscoll had not received any assistance from Thiess in controlling the dust at the KVAR. He did not request assistance from Delta as Thiess had given him a general instruction not to speak to Delta staff.
124. At or around 11:00 am DECC's Mr Darryl Clift (the "Officer") telephoned representatives of Delta and informed them that DECC had received complaints from the public regarding airborne ash emanating from the KVAR.
125. Around this time Delta telephoned Mr Hines in order to enquire as to the measures that were being taken to control dust emissions from the KVAR. Mr Hines stated that he would mobilise staff to address the problem on 17 September 2007. Delta advised that this was not satisfactory.
126. Several other complaints were made to DECC on 14 September 2007. Several complaints were also made to Delta.
127. At about 12:00 pm Mr Day notified Delta's Environmental Manager (Western) that Thiess was having problems with dust suppression at the KVAR and was taking steps to address it.
128. At about 12:00 pm Mr Ken Aussell an employee of Skilled, subcontractor to Thiess, and acting supervisor to Mr Driscoll attended the KVAR and directed Mr Driscoll to operate the water cart. Mr Driscoll followed this direction.
129. At the time that he gave the direction Mr Aussell was on the western batter connecting sprinklers. It took several hours for Mr Aussell to relocate the sprinkler system. Mr Aussell was assisted in this regard by Mr Reed.
130. At about 12:45 pm, the Officer arrived at Skelly Road, in east Lidsdale, between the Wallerawang Power Station and the KVAR. The Officer stopped to view the KVAR. He saw substantial amounts of dust being emitted into the air and leaving the KVAR with each gust of wind.
131. Around 1:30 pm, the Officer entered the KVAR and saw that the Mound was exposed on all sides and that clouds of dust were rising from it into the air and leaving the KVAR as the wind gusted.
132. The Officer inspected the KVAR accompanied by employees of Delta. The Officer observed that:
· dust was billowing from the western batter;
· flyash containment measures on the western side of the Mound were minimal, with a maximum of 12 sprinklers operating;
· a lone employee was operating the sprinklers near the base of the Mound, but he was below the area from which the dust was rising;
· there were no sprinklers on the eastern side of the Mound; and
· there was no sprinkler system on the eastern, north eastern or south eastern side of the Mound.
133. …
134. Also around 1:30 pm Mr Driscoll returned to the KVAR and observed that the Officer was present. Mr Driscoll then continued to operate the water cart from around 1:30 pm to 6:00 pm.
135. The Officer instructed 2 Delta employees that immediate action was required to contain the flyash. One employee explained that irrigation equipment had been ordered to dampen the flyash and contain it.
Incident Response
136. Delta took the following actions:
· Liaised with Thiess to address the Incident.
· Arranged for additional staff and equipment from the Mount Piper Ash Dam to attend the KVAR. The additional equipment included two additional water carts which arrived at 2:00 pm.
· When Delta staff visited the site on the morning of the 14 September 2007, they directed Thiess staff to take additional and immediate action to ensure ash did not leave the Mound in accordance with the Contract.
Mr Day first contacted Mr Hines and left a message on his phone.
He then attended the site office and spoke with Mr Aussell and expressed his concern to him.
He also forwarded an email to Thiess to confirm his concerns in relation to the management of the Mound.
· Ensured that key staff members did not finish work at the KVAR until they were sure that dust emissions were under control.
· Requested reports from Thiess on the causes of the Incident and conducted further site inspections.
· By 17 September 2007 installed a water cart with a water cannon on top of the Mound.
· By 17 September 2007 sourced and paid for additional irrigation equipment.
137. Thiess arranged to have additional staff at the KVAR from 4:30 pm on the day of the Incident.
138. It is agreed between the parties that dust emitted from the Mound on the day of the Incident left the Wallerawang premises.
Causes of the Incident
139. The Incident had many causes as listed below:
· The failure of Thiess to progressively cap, either temporarily or permanently, large areas of the Mound leaving large areas of exposed flyash. Temporary or permanent capping of all parts of the Mound should have been done progressively and would have minimised dust emissions from all parts of the Mound other than those areas of the Mound that were operational.
· Temporary capping was a key initiative contemplated by Thiess. Thiess had been preparing parts of the Mound for temporary capping meaning that a larger area than normal of flyash was exposed. However, dust from these areas could have been minimised or prevented by use of adequate irrigation equipment.
· The recent works carried out on the western batter also exposed significant amounts of flyash. However, dust from these areas could have been minimised or prevented by use of adequate irrigation equipment.
· The exposed flyash was not sufficiently damp as there were an inadequate number of sprinklers at the KVAR generally, including an inadequate number of sprinklers on all batters above the areas capped by the prior contractor including on top of the Mound. Also, sprinklers installed on the top of the Mound and on some areas of the batter were not in service.
· The exposed flyash was also not sufficiently damp because the water cart was not in service on the day and had not been operated for some time.
· Strong, gusting winds.
· Thiess' inadequate management, including inadequate staffing, at the KVAR.
140. Delta admits that on 14 September 2007 the KVAR was not maintained in a condition that minimised or prevented dust.
141. Given the condition in which the premises were maintained, emission of dust from the premises on the day of the Incident was foreseeable by Delta. The potential for dust emitted from the Mound to cause actual harm to the visual amenity of the general public, as well as potential harm to the physical amenity of the general public and persons located at the KVAR, was also foreseeable.
Post-Incident
142. On Monday 17 September 2007, around 12 noon, the Officer returned to the KVAR to inspect the effectiveness of any control measures that had been implemented.
143. The Officer observed that:
· There was a water cannon in operation at the top of the Mound. However, according to the Officer the water cannon did not dampen the flyash sufficiently and the Mound continued to emit dust.
· There were no sprinklers in place on the southern slope.
· Sprinklers in place on the northern slope were not operating.
· Sprinklers had been put in place on the eastern side of the Mound but they were not operational so the flyash remained dry and flyash emissions continued.
· Sprinklers in place on the south western slope were operational and were containing dust effectively.
· Flyash dust emissions from the Mound were substantially lower than on 14 September 2007.
· Further irrigation equipment arrived on 17 September 2007.
144. In the 4 to 5 weeks after the Incident 80% of the Mound was capped with gravel. After permanent capping was placed on the Mound, dust emissions from the Mound ceased.
145. DECC is now satisfied that the management of dust emissions at the KVAR is adequate.
6 The Defendant relied on an affidavit of Mr Saladine dated 23 December 2008 which explains that the Defendant undertakes substantial electricity generation functions. It owns four coal fired power stations in NSW, including WPS near Lithgow. The substantial size of WPS and the scale of the power generation is set out at par 22-26. The production of flyash and therefore need to store substantial amounts of it is set out at par 27-42. Each month 50,000 tonnes of flyash is produced at WPS. The management by skilled contractors of the disposal of that flyash is discussed at par 43-55. Paragraph 45 emphasises that specialised knowledge is required to manage flyash stockpiles. A complex system is necessary, inter alia, to ensure the design and stability of the ash mound, determine the amount of moisture that has to be added to maximise the strength of the completed mound, coordinate flyash removal from the plant and delivery to the mound, and determine and implement the most suitable rehabilitation of the mound's external surface. The job of managing flyash is usually contracted out by entities such as the Defendant.
7 The process of selecting Thiess by tender is discussed at par 56-69 of Mr Saladine's affidavit. Selection followed checks of Thiess clients and site inspections of sites managed by Thiess to determine its capability to undertake flyash stockpile management. Mr Saladine's involvement on the day of the offence is set out at par 70-80 and included checking whether dust was being blown over neighbouring properties. In relation to the western barrier the Defendant engaged geotechnical advice and developed a plan to enable extraction of the soil and reinforcement of the slope with ash safely. Henry Plant Hire was engaged in late August 2007 (par 81-82) to undertake the work.
8 At paragraphs 84-89, Mr Saladine describes the appointment of a new contractor for the KVAR on 1 December 2008. The new contractor has implemented regular inspections and audits plus appointed additional staff who receive training and regular weekly briefings on management of the flyash mound. There is regular communication with the Defendant. The affidavit also identifies at par 100-115 the large number of community activities which Mr Saladine has undertaken on behalf of the Defendant in areas where it operates power stations and more generally community outreach by the Defendant in the western region. He is authorised at par 116 to state on behalf of the Defendant that it accepts responsibility for its actions, including for a breach of a condition of its licence, understands the seriousness of the offence and is remorseful for the offence.