Section 9
SEC. 9. The municipal presidents shall be charged with carrying out the plans of the district engineer for the work to be performed within their respective municipalities, and shall follow in the prosecution of the work the general specifications of the district engineer. They shall utilize the labor provided for in this Act in the prosecution of said work and shall be authorized to expend such . sums from the money accruing under this Act as are necessary for the purchase of tools and material and the hire of foreman labor and of the transportation of materials for the proper prosecution of the work, except as hereinafter provided. Each person, upon the performance of the labor required by this Act, shall receive a certificate, in such form as the Insular Auditor shall prescribe, stating that he has performed such labor and specifying the dates, place, and nature oil the work upon which such labor was performed.