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<br /> <br />During this same period, slight changes in the eater <br />quality of these two wells were observed. Figure 2 <br />(Attachment D) shows sulfate concentrations versus time, <br />exemplifing these changes. Sulfate concentration in the <br />two ~•rells respcnded in opposite directions during this <br />time period. An explanation for the oppcsite changes <br />may be related to relative depth of each well and distance <br />for the active ditch, but quantitative evidence has not <br />beer, developed. However, since construction did not <br />begin until October 15, 1985, and the largest u:ater <br />quality change occurred in September, the apparent change <br />is not associated with any surface activities at tre mine <br />site. <br />Although not monitored as part of the primary facility's <br />operational system, a hydrograph of OS•7-11 was provided <br />for general background information (Attachment D, Figure <br />3). They hydrograph indicates that water levels in this <br />area of the site respond directly to river stage. 4;ithout <br />comparing actual stage values, it is apparent that the <br />sharp rise ir. May is due to high river stage which <br />steadily declines through the summec months. <br />Data ccllected during 1985 not previously reported is <br />listed below. Since the monitoring frequency is <br />quarterly during operation, only a new data sets have <br />been collected during this time period. <br />CR-2 <br />DATE TEP1P (C) CONDUCTIVITY PH DzSS. OX1'G. <br /> <br />7/26/85 17.0 55© 8,14 -- <br />9/25/85 11.7 605 6.76 -- <br />1/93/86 1.9 348 7.29 12.08 mg/1 <br /> <br />