[1401-12.] SECTION  1141 . District Engineer in Capacity of Sanitary Engineer . — Within their respective districts, district engineers shall act as sanitary engineers, and shall consult with district health officers regarding sanitary improvements therein. District engineers shall give information to district health officers as to the existence of insanitary conditions and of any failure to comply with legal sanitary orders and regulations which may come to their knowledge. [1487-7; Comp., 768.] SECTION  1142 . Letting of Contracts for Insular Works . — When any Insular public work of construction or repair involves an estimated cost of three thousand pesos or more, the contract therefor shall, except as hereinbelow provided, be awarded by the Direct or of Public Works to the lowest responsible bidder after publication extending over a period of at least ten days. HcDSaT Publication in such case shall be effected by advertisement in a paper of general circulation in the province or city where the work is to be done, and by posting notice at the main entrance of the provincial building, if the work is to be done in a provin ce. When there is no local paper of general circulation published in the province in question, the newspaper publication herein required may be effected, if advisable, through the medium of a Manila daily of general circulation or of any paper of general c irculation published in any province. In the discretion of the Director of Public Works, publication hereunder may be made in two newspapers, one of which shall be printed in the English language and one in some other language; and nothing herein shall be  construed to prevent the Director of Public Works from adopting such additional means of publication as will secure ample publicity for all invitations for bids. When the work involves the construction or repair of a lighthouse, or of a road or trail, and in any case where the work to be accomplished is in a locality where contractors are not available or is of such character that advertising for bids would probabl y be fruitless, the Director of Public Works may waive the requirements of this section and, with the approval of the Secretary of Commerce and Police, may either let the contract to a private contractor or proceed to execute the work himself. ARTICLE  III Contracts for Public Works Copyright 2012 CD Technologies Asia, Inc. and Accesslaw, Inc. Philippine Law Encyclopedia 2011 342