Factual background
3 The factual background to the s 106 application and the present relief is as follows. Because of its complexity it is necessary to set it out in some detail to understand the issues for decision. In 1999 the respondent contracted to the New South Wales Department of Public Works and Services (DPWS) to design and construct the Moruya South Heads Sewerage Scheme and the applicant became its major subcontractor for the project. This occurred through a process which commenced as described in evidence in this way:
3. Allied engaged consulting engineers, Hyder, to redesign the sewerage scheme contained in the DPWS drawings with a view to achieving savings in the cost of construction. Hyder prepared that design ("the Hyder Design") and produced schedules headed "RETIC 7" that detailed the variations of that design from the conception design contained in the DPWS drawings ("the Hyder Schedules").
4. The cost savings in the Hyder Design were achieved by various means including:
(a) a reduction in the diameter of some pipes (resulting in less excavation)
(b) reduced trench depths for many pipes (resulting in less excavation)
(c) substitution of devices known as "Saif-Tees" for manholes (Saif-Tees being substantially less expensive to install than manholes)
(d) the elimination of scours from rising mains
(e) incorporation of "low lift" pump stations (resulting in less excavation)
5. In June 1999 Allied invited the Applicant ("Kenoss") to tender for a subcontract for the pipelaying and associated works involved in the Hyder Design. Allied provided Kenoss with DPWS drawings and the Hyder Schedules constituting the Hyder Design.
6. In about 16 June 1999, after having consulted with Allied, Kenoss submitted a tender to Allied based on the Hyder Design and the Hyder Schedules in the sum of $2.002 million.
7. The person at Kenoss who prepared the tender was Mr Bruce Ford, Kenoss' senior engineer and the person who was to be Kenoss' project manager for the project if Kenoss' tender was accepted.
8. Thereafter, Mr Ford had consultations with Mr Fred Brown of Allied on a reduced scope of works.
9. On about 11 August 1999 Mr Ford went overseas on holiday to Canada.
10. By letter dated 16 August 1999 Kenoss submitted to Allied a revised tender, prepared by Mr Ford prior to his departure, based on a reduced scope of works, in the sum of $1,607,813 which was subsequently revised to an amount of $1,659,313.00 ("the revised tender").
11. Allied submitted a 'design and construct' tender for the Moruya South Heads Sewerage Scheme to the DPWS based on the Hyder Design which tender was subsequently accepted by the DPWS.
12. Allied and DPWS entered a contract ("the Main Contract") for the construction of the Moruya South Heads Sewerage Scheme based on the Hyder Design being Department of Public Works and Services Contract No. 9800433.
4 The situation then became complicated, according to the applicant, because of circumstances which arose during the absence overseas on leave of Mr Bruce Ford:
13. While Mr Ford was absent abroad, Allied wrote a series of letters seeking clarification as to whether particular matters were within the scope of the revised tender and held a meeting with Kenoss on 12 October 1999 to further address that issue.
14. A junior staff member within Kenoss, Mr Matt Houghton, responded to those letters and spoke at the meeting and erroneously indicated that matters were within ambit of the Kenoss tender.
15. Allied must have known, or must be taken to have known, that at least some [of] the matters agreed by Kenoss in that correspondence were being agreed in error and that the tender price submitted by Kenoss was not sufficient to cover the scope of work that was being agreed in the course of the correspondence and the meeting of 12 October 2000.
16. In about late November or early December 2000 Allied submitted a form of subcontract to Kenoss for execution. One of the junior staff members, Mr Ilmar Kalnins, executed the form of subcontract on behalf of Kenoss ("the Subcontract") and forwarded it to Allied.
17. The form of Subcontract as executed annexed the DPWS drawings but did not refer to the Hyder Design or annex the Hyder Schedules.
18. The principal areas in which the Subcontract contained a scope of works that was broader than the scope of works on which Mr Ford had based his revised tender were:
(a) survey with placement of survey pegs to enable Kenoss as pipelayer to set the levels;
(b) responsibility for locating services;
(c) the supply and placement of sand for side support and overlay of the pipes in the trenches;
(d) restoration of precise ground levels;
(e) trench compaction complying only with the requirements of a standard known as TR3;
(f) supply of metal bedding in wet areas
(g) supply geotextile fabric;
(h) total responsibility for traffic control;
19. On or about 13 December 1999 Allied executed that form of subcontract and returned it to Kenoss. Mr Ford returned to wok on 13 December 1999 and a few days later saw the executed subcontract and saw that it contained a scope of work far exceeding the scope of work on which original tender or the revised tender were based.
5 Mr Ford arranged for a meeting between the parties and on 11 January 2000 there was a meeting at the offices of Allied and Kenoss to discuss the mistakes made by the junior staff members and the fact that the subcontract as signed annexed only the DPWS drawings and incorrectly omitted reference to the Hyder Design and the Hyder Schedules. Also discussed was the inability of Kenoss to perform the subcontract for the subcontracted price.
6 During the meeting of 11 January 2000 it was agreed through Mr Brown that the subcontract should reflect what was priced, namely the Hyder Design and not the design in the DPWS drawings and that variations would be measured against the Hyder Design. It was also agreed that Allied would consider in good faith any improvements in the design becoming evident while construction was proceeding and suggested by Kenoss so as reduce the cost of construction. Allied said that it would consider making payment towards the cost of supplying sand for the side support and overlay of pipes and it was agreed that Allied would assume primary responsibility for locating services, with Kenoss supplying a backhoe for investigative excavation. A number of other matters of less significance but nevertheless important to the parties' arrangements, were also agreed. It also further represented that Allied would only exercise its rights under the Termination for Convenience Clause if the work was taken from Allied by the DPWS.
7 The applicant then commenced work on the project on 16 February 2000. The construction drawings provided to the applicant by the respondent at or about the time of the commencement were drawings of, and substantially embodied, Hyder Design and Hyder Schedules. It is then said:
26. On the first day of work Mr Andrew Burns, Allied's representative on site, agreed with Mr Ford that in relation to amendments to the design:
(a) Allied would issue and Kenoss would accept revisions of the design in the form of hand altered photocopies of the plans thereby releasing Allied from having to issue amended drawings for each change;
(b) the amendments would be taken by the parties as forming part of the construction drawings and a remeasure at the end of the contract would determine the overall variations either way;
(c) Allied would not require Kenoss to issue formal variation paper work for each and every revision or amendment.
("the Burns agreement").
Applicant's submissions
8 The applicant then relies upon what happened in relation to certain variations or alleged variations, and this is the first basis of unfairness which the applicant alleges. It says that during the course of the works the respondent issued field directions in the form of drawings etc. which varied or amended the construction drawings and the eight Hyder Schedules and these variations involved the applicant in substantial additional work, as particularised; notwithstanding the variations and directions required by the respondent, the respondent has refused to recognise any variation and has refused to grant an extension of time for any of them.
9 The applicant's evidence is that, although the respondent was to some extent then accommodating towards it in the early stages of the project consistent with the matters represented by and agreed with Mr Brown at the Wollongong meeting, tensions developed between the parties culminating in a meeting on 31 May 2000 at which the respondent indicated that it required the applicant to perform strictly in accordance with the subcontract. Further, that it was impractical at this stage for the applicant to do other than attempt to complete the subcontract in accordance with the requirements of the respondent.
10 The situation then became further complicated by a course of events which commenced on approximately 16 August 2000 and this is said to give rise to the second ground of unfairness. On that date the applicant carried out preliminary work on a part of the project referred to as "the South Head Road line" and the respondent directed the applicant not to carry out further work in that area "initially to permit dilapidation surveys required by DPWS … and continuing after a dilapidation survey revealed a house susceptible to damage because of the poor state of its foundations". The applicant contended that, because of these developments, there should have been a suspension of the work under the subcontract. However, the respondent suspended the work on the basis that the applicant was the requesting party rather than, as the applicant submits, the respondent should be regarded as the requesting party.
11 Although the completion date specified in the subcontract was 2 September 2000, by that date the applicant did not receive any direction to proceed with the work on the South Head Road line until 10 October 2000 when the respondent directed the applicant to proceed in that area. However, according to the applicant, the blasting holes and the bench where that line was to be laid had become badly contaminated with raw sewage for reasons outside its control. It had not been known that the area was contaminated either at the time of the tender or otherwise and no provision was made in the tender or subcontract for work to be performed in contaminated ground. Certain correspondence ensued and on 10 November 2000 the respondent withdrew the South Head Road line work from the applicant and arranged for it to be carried out by another subcontractor which was prepared to work in the contaminated ground.
12 On 19 December 2000 the respondent issued a letter to the applicant indicating substantial completion of the subcontract works and the works were handed over to the DPWS on that day.
13 Subsequently, and since the only extension of time granted by the respondent to the applicant was an extension of ten days from 2 to 12 September 2000 on account of wet weather, the respondent made a claim against the applicant for liquidated damages under the subcontract in respect of the whole of the period 12 September to 19 December 2000 in the sum of $367,000, as calculated in accordance with the subcontract. The applicant submits that it is entitled to extensions of time arising out of, first, the variation; secondly, the respondent's direction to cease work on the South Head Road line; and thirdly, the inability of the applicant to continue working in that area after 10 October 2000 because of the contamination. Accordingly, it is submitted by the applicant that it had substantially completed its contract work well before 19 December 2000, a substantial proportion of the rectification work performed by the applicant at the end of the contract works related to leaks caused by defective material supplied by the respondent; and the respondent, to the best of the applicant's knowledge, has not been required to pay any liquidated damages for delay under the main contract with the DPWS.
14 Returning to the first ground of unfairness, the respondent has made certain claims for "negative variations" on the applicant arising from the fact that the applicant has carried out work less than that required under the subcontract; and part of the claims the respondent makes on the applicant relate to that situation. The applicant submits that situation raises the question of unfairness because it has carried out the work in substance under the original tender for the amount of the tender and the fact that it has done less work than required under the contract reflects the mistaken situation which occurred and represented the difference between the matters in the tender and the matters included in the subcontract. This, it is submitted, shows the substantial unfairness of the "negative variations". In summary on relevant financial matters the applicant deposes:
Financial matters
44. Kenoss' actual expenditure to date on the Subcontract is in excess of $1.9 million and Kenoss has outstanding liabilities of between $190,000 and $230,000 in relation to the Subcontract. These amounts doe not include any allowance for the cost of plant provided by an associated company, Kenoss Pty Limited, to Kenoss for use on the project. The cost of hire of that plant is in excess of $500,000.
45. Kenoss has received $1.343 million from Allied in relation to the works.
46. Notwithstanding the fact that the Subcontract price is $1.659 million, Allied claims (on the basis inter alia of negative variations and backcharges of approximately $250,000 and the liquidated damages claim of $367,000) that Kenoss is indebted to Allied in the sum of $344,888.
47. Allied has indicated its intention to call on a bank guarantee in the sum of $82,965 provided by the National Australia Bank to Allied on behalf of Kenoss in partial satisfaction of that alleged indebtedness.
48. The position for which Allied contends is one where, on a subcontract sum of $1.659 million and where actual expenditure by Kenoss exceeds $2.2 million and is in excess of $2.7 million when proper account is taken for the cost of plant, the total amount properly due to Kenoss on the Subcontract is only $0.988 million. (emphasis in original)