slaughterhouses, and of any system established for lighting the streets, public places, and public buildings; shall prevent the encroachment of private buildings and fences on the streets and public places of the city; shall inspect and supervise the construction, repair, removal, and safety of private buildings; shall regulate and enforce the numbering of houses  in accordance with the ordinances of the city; shall have the care of all public streets, parks, cemeteries, and bridges; shall maintain, clean, sprinkle, and regulate the use of the same for all purposes as provided by ordinance; shall collect and dispos e of all garbage, refuse, the contents of closets, vaults, and cesspools, and all other offensive and dangerous substances within the city in accordance with ordinance; shall prepare plans and have charge of the construction of any sewer and water supply sy stems of the city hereafter authorized; shall have the care and custody of any such public system of waterworks and sewers, and all sources of water supply, and shall control, maintain, and regulate the use of the same in accordance with the ordinances re lating thereto; shall inspect and regulate, subject to the approval of the mayor, the use of all private systems for supplying water to the city and its inhabitants, and all private sewers and their connection with the public sewer system; and shall prepar e plans, maps, specifications, and estimates for buildings, streets, bridges, and other public works, and supervise the construction and repair of the same. But no construction involving public buildings, laying out of streets or parks or change of existin g buildings, streets, or parks shall be begun without first having obtained plans therefor approved by the consulting architect, and it shall be the duty of the consulting architect to advise the mayor, the city council, and the city engineer of the city o n all matters pertaining to the architectural features of construction, repair, or alterations of a material nature of public buildings and monuments of a permanent character, or any construction involving a modification of the Burnham plans, including the l aying out or alteration of public streets and parks, and, upon request, to prepare plans, specifications, estimates, and other information for public buildings or works of a permanent character for the city. ( c ) He shall file and preserve all maps, plans, notes, surveys, and other papers and documents pertaining to his office. ( d ) He shall have power, subject to the approval of the mayor, to cause buildings dangerous to the public to be made secure or torn down, and shall supervise and regulate the locations and use of engines, Copyright 2012 CD Technologies Asia, Inc. and Accesslaw, Inc. Philippine Law Encyclopedia 2011 774