In Maskel Construction Co. v. Glastonbury, 158 Conn. 592, 596, 264 A.2d 557 (1969), the Court held that the trial court improperly resorted to evidence of a custom in the trade that required an owner or a municipality to pay extra costs arising out of "conflicts." Such conflicts represented the difference in the actual conditions that were found by the contractor and the information that was shown on the owner's maps or plans. The Supreme Court held that "even if the existence of such a custom in the sewer construction trade had been proved, it nevertheless could not vary the specific terms of the contract . . . ." Id.