Delivery of fuel (e.g. Sulphur Free Gas Oil) to the Geological Survey Ireland (GSI) vessels R.V. Keary, R.V. Mallet, R.V. Lir, R.V. Geo and R.V. Galtee, as needed at locations on the coast of Co. Mayo (predominantly Ballyglass Pier and Blacksod Pier on the Mullet Peninsula). Also included is the possibility of requiring fuel occasionally in Counties Galway and Sligo.