An engineer for a viaduct in the New Tai Lam section of Castle Peak Road told his staff to replace substandard figures with fake ones, the District Court heard yesterday. Staff were fed measurements on aspects of the construction by Franky Au Yeung Chi-ho, 32, a senior engineer for Alga (Far East), the subcontractor for the viaduct, and told to report them in place of the real figures, counsel for the prosecution Neil Mitchell said yesterday in his opening statement in Au Yeung's trial on one count of conspiracy to defraud and two of fraud. The trial is before Deputy Judge David Dufton. The Highways Department contracted a project for road improvement on Castle Peak Road to Gammon Construction in 2003. Gammon subcontracted an 800-metre viaduct along the New Tai Lam section to Alga. Au Yeung, who is no longer with Alga, was in charge of a process during which metal tendons in the decks of the viaduct were stressed to strengthen the decks. The amount by which the tendons elongated under tension had to match a set of predicted measurements in design plans. A foreman and two workers who did the readings during the stressing process were given elongation measurements by Au Yeung to report to Gammon from mid-2004 to August 2006 in place of actual measurements that significantly deviated from those stipulated in the design, the court heard. Foreman Li May-tak said 60 to 70 per cent of the measurements he reported from mid-2004 to mid-2006 deviated from the real figures, Mr Mitchell said. A worker told Andrew Kwan Ming-tak, senior project management at Gammon, that some of the measurements were wrong. The trial continues today.