Specifications include, but are not limited to: The contractor will coordinate all work activities with the Director of Buildings & Grounds of the Portsmouth School Department. This coordination shall include the ordering, scheduling, and timing of work performed. In addition, it shall include the submission and approval of all monthly billings. The contractor will supply a copy of the State Pesticide Licenses “B” and “G2” and certificates for all products proposed to be used to the Facilities Director before starting any work. The method of payment shall be monthly billings upon completion of work performed on a monthly basis. This method may be replaced by less frequent "progress" billings. In no case will the total paid by the School exceed the proposal price unless specifically agreed to by both parties in writing as described below.