Make a reasonable effort to obtain landowner permission to test all drinking-water supply wells within a 350-foot radius of the blast site at the contractor's expense and at the convenience of the abutting landowners. Such tests shall document the flow rate of the well prior to blasting as well as the values of the coliform bacteria, E. coli, nitrite-N, nitrate-N, pH, copper, iron, chloride, manganese, arsenic, calcium and sodium. A copy of the results of the preblast well testing shall be furnished to the landowner prior to the commencement of the blasting operations.