The County Council, after public hearings and due deliberation, makes the following legislative findings: The regular, uninterrupted, and efficient removal of refuse, trash, and waste from residences within the County is necessary to prevent nuisances, to prevent the introduction of contagious diseases, and to prevent the incursion of vermin in the County. The need to provide for efficient, uninterrupted refuse collection service exists throughout the County and is especially acute in the more densely populated urban and suburban areas of the County. To ensure the continuity of efficient refuse collection services and thereby to protect and promote the public safety, health, comfort and welfare by preventing nuisances and offensive odors, preventing the creation of harborages for vermin, and preventing conditions conducive to the development or introduction of infectious diseases, it is necessary: To provide for limitations on the number of residences which may be served by any one contractor; To provide for the bidding, award, and extension of contracts for the provision of refuse collection services; and To authorize the Purchasing Agent to extend or rebid refuse collection contracts in appropriate circumstances, where such action will best protect and promote the public health, safety, comfort and welfare by insuring the uninterrupted availability of efficient refuse collection services.