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1 <br />Introduction 2 <br />' 1.2 Purpose and scope of monitoring plan <br />As per Technical Revision No. 7 Second Adequacy Review, Stipulation #2, dated March 31, 1998, <br />the primary purpose of this monitoring plan is to provide water quality data during plug <br />' construction for baseline and initial plug performance information as well as odic seal monitoring <br />for use in evaluation of the long term odic plug performance. This monitoring plan is to supersede <br />previous monitoring requirements as they relate to the closure of the 9360 Adit. The plan includes <br />' provisions for the following: <br />• collection of water quality data, <br />monitoring of infiltration trench performance, <br />' monitoring of water pressure behind adit plug, <br />• monitoring of any tracer injected behind the plug, and <br />' visual inspection of springs, seeps, and seepage around adit plug. <br />' Comprehensively, the data gathered will be used to evaluate short and long term adit plug <br />performance, the water conditions in the underground workings, and any potential for change in <br />the water quality of the lower part of Windy Gulch resulting from installation of the odic plug. <br />1 <br /> <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br />