The West Water Supply Scheme: Turbidity Monitors Contract at sites in Caugh Hill, Carmoney, Glenhordial, Lough Fea, Lough Derg and Braden Water Treatment Works is designed to upgrade old turbidity monitors and ensure quality control of water production in the west of the province. The old style instruments are being replaced by high precision contact and non-contact type Hach Lang and Sigrist turbidity units. The complex nature of the contract involves the continuity of operation of the treatment works to ensure minimum disruption to water production during the contract. FM Environmental engineers received special training in the calibration and verification of both types of systems which are being installed on clarifier tanks, primary and post primary tanks, DAF units, raw water inlet supply and supernatant and final water sample tanks at each of the works.