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<br />1 <br />~1 II. Hydrologic Monitoring Network <br />' The present monitoring network is a modification of the network used during <br />baseline monitoring. The modifications are mostly simplifications justified <br />' by the monitoring records from 1978 to 1983. Continuous streamflow records <br />are made for Trout Creek above the mine (TR-a), and for the Koll Ditch and <br />Homestead Ditch from May through October (periods of freezing sometimes <br />necessitate the records to be of shorter duration). Instantaneous streamflow <br />' is recorded on Trout Creek below the west Ridge mining area at TR-b. <br />Instantaneous streamflow is recorded on Oak Creek near the Edna Mine tipple at <br />' Station OK-a. Surface water samples are collected above and below the mine at <br />TR-A and TR-D, respectively. Additional surface water sampling sites along <br />Trout Creek are taken at TR-B (downstream of the active mining area and <br />' upstream of the Moffat Area) and TR-C (located adjacent to the Moffat Area). <br />Sites TR-B and TR-C are also located in the proximity of alluvial well TR-2 <br />' and the Homestead Ditch intake, respectively. Sampling at TR-C was started in <br />April of 1985 in anticipation of mining the Moffat Area. Surface water <br />samples on Oak Creek are taken above and below the tipple at stations OK-A and <br />OK-B, respectively. Ground water samples are collected from five wells <br />' completed in the alluvium along Trout Creek (TR-1, TR-1.5, TR-2, TR-3, and <br />TR-4), in the alluvium along Oak Creek (OK-2) and from a spoils well located <br />' at the base of the West Ridge Area (WR-1). <br />Water Quality Analysis and Sampling Frequency <br />1 <br />The samples are analyzed for the parameters listed in the permit on pages <br />' 9.6-191 through 4.6-141a. Sampling frequency at the various sites is also <br />listed on the abovementioned pages in the permit. Field parameters including <br />' pH, temperature, conductivity and dissolved oxygen are measured using a Horiba <br />water quality test instrument. <br /> <br /> <br /> <br />