The Department of Public Works is authorized and directed to purchase, install and maintain mobile public comfort stations at appropriate places on the islands of St. Thomas, St. Croix, and St. John, to be determined by the Commissioner of Health; Provided, That at least three comfort stations shall be situated in the town of Charlotte Amalie, at least two comfort stations shall be situated in each of the towns of Christiansted and Frederiksted, and at least one such station shall be situated in each of the towns of Cruz Bay and Coral Bay.