(a) The Contractor shall perform the Work in strict conformity with the Contract Documents and in a good, substantial and workmanlike manner to the satisfaction of the Authority and shall furnish at its own cost and expense all labor, materials, plant, equipment, tools, requisite insurance, and all taxes thereon, which are necessary in connection with the Work or incidental thereto, all for the sum as accepted by the Authority. (b) The Contractor shall perform on the site, and with its own organization, Work of a value equivalent to at least thirty-five percent (35%) of the total amount of Work to be performed under the Contract. This percentage may be reduced by a supplemental agreement to this Contract, if the Contractor requests a reduction and the Authority determines that such reduction would be in its best interests.