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UCRL-AR-103194 <br /> (C) For methods of monitoring where the presence of the hazardous substance is <br /> not determined directly (i.e.,liquid level measurements), the monitoring <br /> program shall specify the proposed method(s) for determining the presence of <br /> the hazardous substance if the indirect methods indicate a possible <br /> unauthorized release. <br /> D-2 Monitoring Program for New Underground Storage Tank <br />