Laserfiche WebLink
HYDROLOGY IMPACTS 1987 <br />SURFACE WATER - EXISTING MONITORING AND IMPACTS Page -2- <br />13-8 and 18-4. Minimums, means and maximums of the parameters are presented <br />graphically and follow the 1987 data charts for these resources. <br />Pond 13-8 was undermined by the Orchard Valley Mine. Ponds 81, 83, 7-7, 13-7, <br />17-1 and 19-1 are adjacent to the workings of the Orchard Valley Mine. No ponds <br />have been undermined by the Orchard Valley West Mine. <br />No evidence of impact due to mining exists. As shown in the graphs, physical <br />and chemical characteristics of the ponds monitored in 1987 were typical of past <br />years. Those ponds which were fed in part by springs or seeps remained filled <br />for a longer portion or all of the monitoring season as in past years. Changes <br />in field and chemical parameters were less in those ponds Eed by springs due to <br />dilution. The water in ponds fed only by runoff tended to stagnate as indicated <br />by sharp rises in pH, electroconductivity, total dissolved solids and concentra- <br />tions of the major ions. Based on these data and observations, CWI believes <br />that neither the development in the Orchard Valley Mine nor the Orchard Valley <br />West Mine has impacted pond resources within the permit area. <br />• <br />• <br />