The purpose of this classification is to provide responsible general facilities and grounds maintenance work which may involve the cleaning of buildings, the maintenance of lawns and walkways, the operation of a tractor and harrow in a sand filter bed, the reading of instruments and the collection of water samples, the maintenance of pump station equipment and facilities and the operation of varied maintenance equipment used in the maintenance of roads, reservoir lands, pipelines and related facilities. The Metropolitan District Commission (MDC) provides quality water supply, water pollution control, mapping, and household hazardous waste collection to eight member municipalities: Bloomfield, East Hartford, Hartford, Newington, Rocky Hill, West Hartford, Wethersfield and Windsor.