(3.) To prepare all plans, specifications, or instructions necessary in relation thereto, and as to the materials to be used therein, and to see that all works are completed according to contracts entered into. (4.) To engage and dismiss under sanction of the committee all workmen employed at daily and weekly wages.[3] (5.) To certify all accounts for work done, materials supplied, and wages due. (6.) To have charge of all materials and implements. (7.) To purchase or contract for, or hire all horses, carts, tumbrils, stones, flags, gravel, draining pipes, and proper implements and materials, and all other matters and things, at such prices and in such manner as the committee shall judge reasonable and expedient, and to sell or otherwise dispose of the same as he may be directed. (8.) To have the entire charge and superintendence of the breaking up and repairing of all streets, for the purpose of laying or replacing gas and water pipes. (9.) To inspect and report, in conjunction with the medical officer of health, upon slaughter-houses preliminary to licences being granted, and to make the plans and superintend the construction of any slaughter-houses which the council may hereafter erect. (10.) To take all levels and surveys which may be necessary for the purpose of deciding on the best mode of draining the several districts, or any part thereof, or for the purpose of fixing the levels and inclinations of any streets or roads, or in anywise relating thereto. (11.) To carry out the scheme now in course of construction for the interception of the sewage of the borough, and any future scheme, for its precipitation, filtration, deodorization, or any other process which the council may adopt, either within or without the borough. (12.) To superintend the construction and completion of all tramway lines and sidings which may be required. (13.) To prepare, from time to time, schemes for the drainage of the several districts or any part thereof. (14.) To prepare all such plans, sections, and specifications as may be necessary for the due execution of any flagging, paving, sewering, or other works required to be done, or for entering into any contracts in relation thereto, and to see that all works are executed in accordance therewith. (15.) To measure up and duly certify the execution of all works, and apportion the cost to the parties chargeable therewith. (16.) To see that all house drains, which may from time to time be carried into any public sewer, are made and connected in accordance with the regulations. (17.) To give to the several contractors performing any works, orders for the same in writing only, keeping duplicates thereof, duly entered in a book to be kept by him for that purpose. (18.) To prepare all plans, drawings, and estimates required, and to superintend the execution of all improvements. (19.) To see that no encroachments be made on any highway or public place.