"We're looking at the looming, all the ducting before the bulk heads go in, " said James Lewis, who started as a maintenanceengineer with British Airways 25 years ago.
Drilling under Plan A will stop this weekend once the drill bit reaches 1, 247 feet (380 meters), then the drill will receive scheduled maintenance before resuming early next week, engineer Rene Aguilar said.
Mr Reynolds, a former water company engineer, has analysed the amount of renovation and maintenance work carried out on the sewerage network during the 15 years since water privatisation.
He became the department's Essex County resident engineer in January 2005, overseeing road and bridge projects and all DOT maintenance personnel in the county.