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• <br />should be evacuated, the gas meter should be valved off, open <br />flames should be extinguishes;, electrical s~::itches should not <br />be operated and all necessary precautions should be taken to <br />prevent the gas from being ignited. <br />2. Determine if traffic should be stepped or rerouted to prevent <br />possible ignition of the escaping gas. If it is determined that <br />traffic should be rerouted, the police or fire department should <br />be requested to direct the flow of traffic. <br />3. It should be determined whether or not the gas is migrating <br />into storm or sanitary sewers. If gas is found in either type <br />C <br />of sewer, then necessary precautions should be taken to prevent <br />ignition. When gas is found in a sanitary server, the buildings <br />in the immediate area should be checked with a leak detector <br />to determine if any gas is present under or in the buildings. <br />Normally, gas in a sanitary sewer will vent from the sewer <br />stack unless there is a leak in the sewer system and=r the <br />building. At times, gas will get under the building by fol- <br />lowing the sewer ditch. If gas from a sewer is found under <br />a building, the dangerous condition can usually be eliminated <br />by opening a hole in the sanitary sewer line in the yard and <br />the gas will then vent to atmosphere. <br />When gas is found in storm sewers, it will usually vent out <br />at the nearest sewer inlets at the curb. Precautions should <br />be taken to prevent this gas from being ignited by either open <br />• <br />flames or vehicles. <br />-12- <br /> <br />