Laserfiche WebLink
at the NPDES 004 site (caused by spoils water discharges) and, to a lesser extent, reduced • <br />runoff and subsequent evaporation. <br />Per a request by Stephen lla then of the LDNG on December 9, 1992 certain water quality <br />parameters have been plotted for various surface water sites. These plots may be found in <br />Appendix H. For Site 6, 7D5 and sulfates have been plotted on one graph while sulfides <br />have been plotted on a second graph. The TDS/sulfate graph shows that 1) both parameters <br />are increasing with time, 2) both parameters vary seasonally and 3) sulfates increase or <br />decrease seasonally the same as TDS values do. The graph of sutf ides show no discernible <br />trend. It should be noted that concentrations analyzed below the method detection limit <br />are plotted at the detection limit values and that these detection limits have varied with <br />time. Values below the detection limit have been noted on the graph. <br />Surface Yater Site SY-S2-10. The site was instituted in May, 1987, and monitors Cou Camp <br />Creek e[ its confluence with Fish Creek. It is monitored May through September on a <br />monthly basis. As wa s suspected by PCC staff before initiating monitoring, this site <br />flows less often than the upper Cow Camp Creek, Site 6. This year, during the May 18 <br />monthly site visit, a flow of only 0.051 g pm was noted at Site 10 chile Site 6 had a flow • <br />of 32.3 gpm on the same date. This reduction in flow is due to stream channel <br />infiltration and the absence of lateral inflow from tributaries to Cou Camp Creek. No <br />flow was noted at Site 10 from June through September. <br />Nater et this site is a NgC aN a-504 type (see Table 16, Appendix A). TDS increases <br />from Site b to Site 10 ere due to the alkaline and saline nature of the soils along Cou <br />Camp Creek in Twentymile Park, and also due to the evaporat(on in several stock <br />reservoirs located on Cow Lamp Creek between the two sites. TDS values at Site 10 <br />fluctuate from year to year. This fluctuation is due to annual changes in precipitation <br />end is also dependent on the rate of stream flow while each sample is taken. <br />In Appendix H, TDS values, sulfates and sulfide have been plotted for Site 10. TDS and <br />sulfates have been plotted on one graph while sulfides have been plotted on a second <br />graph. Neither graph show any discernible trend. <br />NPDES Discharge Point 008. This site replaces Site 9 which was used to gather baseline <br />information on Bond Lreek in preparation of the 008 pond. Construction of 008 began on • <br />August 4, 1987 and flow through its principal spillway first occurred on February 25, <br />14 <br />