80 The Arbitrator in turn exercised the reserve discretion and allowed an 11 working day EOT as assessed by Mr Lynas.
81 I do not accept that this reasoning evidences misconduct. In my view it deals with the facts in issue in a logical and relatively detailed way, taking account where relevant of the submissions of the parties.
82 EOT 41 related to the construction of an additional suspended apartment slab along the Collins Street side of the building. As the Arbitrator records, the claim arose out of a variation submitted on 5 April 2000 and approved on 16 August 2001. The EOT claim was not submitted until 5 September 2002.
83 Having formed the view that the works did not form part of the contract scope, the Arbitrator identified the next issue as whether the works resulted in critical delay. In so doing he identified the underlying issue which 620 submits was the critical issue.
84 The Arbitrator considered the evidence of Mr Lynas for Abigroup and Mr Wagstaff for 620. He ultimately accepted the assessment of Mr Lynas having regard to the evidence of the Superintendent. Once again I do not accept this process of reasoning evidences misconduct.
85 EOT 44 comprised a 5.1 day EOT relating to the removal of contaminated soil from the basement excavation. As the Arbitrator records, a variation was approved on 8 March 2001, following a variation claim made in November 2000. The EOT claim was not, however, made until 2002.
86 The Arbitrator recorded that it was common ground that part of the excavation works were on the critical path.
87 The Arbitrator sets out the history of the EOT claim and a summary of the relevant evidence.
88 This included evidence of typical delay factors for the removal of contaminated soil of the type in issue, and the calculation by Mr Lynas of that portion of the excavation time attributable to contamination complications.
89 The Arbitrator accepted 620's submission that the Lynas calculations did not take account of a series of relevant factors.
90 He then had regard to the Superintendent's assessment of a two day EOT and ultimately allowed 3.8 working days.
91 In my view his process of reasoning does not disclose misconduct.
92 EOT 9/65 comprised a three day EOT relating to a failure by 620 to advise Abigroup of the outcome of purchasers' choices as to colour schemes and upgrades, by 28 March 2001.
93 The Superintendent assessed this EOT at 4 days on 11 March 2003 (and left this amount unchanged on review on 30 April 2003).
94 The Arbitrator summarised the evidence of Mr Isihos, Abigroup's site co-ordinator, from June 2001, as to subsequent advices concerning purchaser options and upgrades.
95 The Arbitrator recorded and accepted the evidence of Mr Rodgers for 620 as to intended programming.
96 He further recorded the evidence of Mr Isihos that partial advice of the purchasers' options and upgrades, occurring in the latter half of 2001, was not sufficient for Abigroup's purposes.
97 The process in issue led to variation of the contract sum by way of an adjustment of $251,963 for purchaser options/upgrades approved by the Superintendent in January 2002.
98 The Arbitrator identified a strong potential for delay in these circumstances and gave significant weight to the view of the Superintendent, whom he found to be an experienced building works administrator, who gave direct and truthful evidence.
99 The Arbitrator then set out the evidence of Mr Lynas as to the question of critical path.
100 At [290] the Arbitrator sets out a summary of detailed submissions on the facts made by 620. He then responds to each of them.
101 Part of the reasoning accepted by the Arbitrator turns on his acceptance of the proposition that it was reasonable for Mr Lynas to demonstrate criticality by his adjusted Go Mode program (a view based ultimately on the Arbitrator's perception of the evidence as a whole going to this issue).
102 The Arbitrator then allowed 3 days by way of EOT.
103 In my view there is no misconduct demonstrated by the Arbitrator's reasoning.
104 EOT 10 relates to the fit-out and finish of the five Soho Apartments, including the additional apartment provided for by the variation to which I have already referred.
105 Abigroup claims 5.2 working days as a consequence of variation 37. The Arbitrator set out the relevant chronology including the fact that the claim related to 21-28 February 2002 and was submitted on 5 September 2002, and the fact of further correspondence with the Superintendent concerning proof that the critical path of the project was affected.
106 The Arbitrator accepted the underlying logic of the claim: