Specifications include, but are not limited to: A series of holes shall be drilled at three to eight foot intervals throughout the concrete slab. The 5/8” to 3/4” inch diameter holes shall be drilled in the concrete slab in the following manner: These holes shall be drilled to a depth sufficient to penetrate the concrete pavement or deeper. When drilling holes, the drills shall be held as nearly perpendicular as possible to the pavement surface. No more holes shall be drilled during a day’s operations than can be filled during the same day, unless specific approval is given by the City. The polyurethane shall then be injected under the slab. The amount of rise shall be controlled by the pumping unit and injection gun, by measuring the rate of injection of the polyurethane material. Control the final elevations of the slab to within 0.125-inch of the proposed profile elevations to determine sufficient material usage and slab stabilization. Confirm that the pavement has been aligned properly to facilitate drainage. The contractor will be responsible for any pavement blowouts, excessive pavement lifting or pavement damage that may occur as a result of the contractor’s work. The contractor shall repair any subject areas to the satisfaction of the City at the contractor’s expense. Work to stabilize Portland cement pavement under this item shall not be performed when pavement surface temperatures are below 35° F or if the subgrade and/or base course material is frozen. The Contractor shall exercise caution during all operations to insure that slabs are not broken or cracked. Slabs that may become locked and will not lift shall be released by making a full-depth transverse saw cut as directed by the City.