c) This conduct is alleged in paragraph C28 to give rise to an estoppel by representation or an estoppel by convention.
iv. Hence the plaintiff does not accept that the documents sought in category seven go to any issue.
Decision on the question
9 Clearly as a matter of principle the plaintiff's proposition is well grounded. An estoppel by convention will fail for a lack of a communication "across the line".
10 I am unable to discern that Brereton J in Moratic Pty Ltd v Gordon [2007] NSWSC 5, in particular at [37-40], is seen to have held that in a case of conventional estoppel, evidence of the private and non-communicated reasoning and assumptions made by the respective parties could be allowed as admissible.
11 Even giving full credence to the requirement that the Court bear in mind in determining questions of relevance, that the parties are entitled to build up an evidentiary mosaic, the defendant has not shown any entitlement to discovery of documents passing between the parties which did not 'cross the line'. Hence [except for the production of documents the subject of the above described concession by the plaintiff], categories 7, 8A, 11, 13 and 15 are disallowed.
The Compaction Rate Claim
12 WSN in its cross-claim claims damages for what it alleges to be Cleary Bros' failure to achieve compaction rates at the waste management centre. In essence, the contract obliges Cleary Bros to deposit waste dumped at the centre into landfill on the site, and to compact that waste to certain standards. The contract also contemplates, as a related matter, Cleary Bros achieving certain levels of airspace usage in landfill areas.