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1 <br />1 <br />1 <br />1 <br />t <br />1 <br />1 <br /> <br />3 <br />2 ADIT PLUG CONSTRUCTION MONITORING <br />The overall objective of the adit plug construction monitoring is to continue to monitor water <br />management activities, to collect additional baseline water data from Windy Gulch and to assess <br />plug performance prior to initiating long term monitoring. The monitoring described below will be <br />conducted during the period of plug construction and up to the time in which conditions around the <br />adit plug are considered stable. After stable conditions are achieved, the monitoring program will <br />be modified as appropriate (see Section 3). A summary of the adit plug construction monitoring <br />program is provided in Table 2.1. Each measurement is described below. <br />Table 2.1 Adit plug construction monitoring program <br />Measurement ID Description Frequency Period Comments <br />Water sample Trench- Water quality of Monthly When trench is Sample taken from <br /> Inlet influent to in operation weir box at trench <br /> infiltration trench inlet <br />Flow Trench Infiltration trench Daily When trench is Measurement <br /> flow influent rate in operation taken using weir <br /> box at trench inlet <br />Water level SP-1 $ Water level in Daily When trench is <br /> SP-2 trench standpipes in operation <br />Water level VP-1 8 Water level in Weekly When trench is <br /> VP-2 vadose zone in operation <br /> piezometers <br />Visual Inspection of trench Daily When trench is <br />inspection to see if capacity is in operation <br /> being exceeded <br />Water sample WGWB Water quality of Monthly On-going Windy Gulch flow <br /> Windy Gulch at starting in April measurement <br /> rectangular weir 1998 taken <br /> simultaneously, if <br /> practical <br />Pressure APP Water pressure Daily, until When atlit More frequent <br /> behind adit plug pressure seepage relief monitoring if <br /> stabilizes, valve is closed pressure exceeds <br /> then weekly 11 psi <br />Visual Possible seepage Daily, until While plug is If seepage <br />inspection around adit plug pressure accessible observed, flow <br /> stabilizes, rates to be <br /> then weekly measured using <br /> infiltration trench <br /> weir <br />Visual Possible Daily, until On-going <br />inspection development of pressure <br /> springs and seeps stabilizes, <br /> near portal then weekl <br />