These have included major diversions work to two high pressure gas mains and a water main that required a new 1.5m wide, 100m long tunnel at a depth of 20m below the surface.
Mae'r rhain wedi cynnwys gwaith dargyfeirio mawr i ddau brif bibell nwy pwysedd uchel a phrif bibell ddŵr a oedd yn galw am dwnnel 1.5m o led, 100m o hyd ar ddyfnder o 20m o dan yr wyneb.