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File Works Over Application

I need engineer (??) to do Watercare Works Over Application so I can replace damaged retaining wall that runs over waste water pipe. Manhole for camera is on my property ~ 10 meters from wall. Wall is < 1.5 meters at highest point and 20-25 meters long tapering to .2 meters. Sorry can’t seem to upload underground services map here. Also have no idea of cost so expectation wild guess.