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For example, #he risk could be minimized by the installation of <br />strategicaiiy located electrically operated-remotely controlled block <br />valves, encasing the pipe in concrete, cons#ructing a liquid retaining wall, <br />annua! pipeline inspections, the use of tarpaulins and sand to block the <br />flow of petroleum into the infirastructure and the availability and <br />procurement of inflatable (bull-bags) bags that can be inserted into the <br />storm sewer catch basins. <br />8-13 <br />