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16.0 Tank Venting <br />The vapor lines of the two tanks that are underground are tied <br />together. The vapor lines have an extractor plug between the two tanks to <br />keep the vapors from flowing between the tanks. The extractor plug was put <br />when then the tank was being prepared for entry. Once the repairs to the tank <br />are complete this plug will be removed to allow the vapors system to work <br />properly. During the operation the LEL levels will be kept at 10% with these <br />plugs in place. <br />