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values exhi bi Ced an increase until the fall of 1989. The source of this ammonia was from • <br />the washing of ammonium nitrate (used as a blasting agent) trucks at the truck cash <br />facility. Upon the discovery of these high ammonia values, this practice has been <br />discontinued. As a result, ammonia values have dropped to a level below that of the <br />aquatic life standard. <br />Surface Water Site SV-S2-2. This site is the furthest downstream surface water site in <br />the Little Grassy and Grassy Creek drainages prior to exiting the permit area. Therefore, <br />it is the most significant monitoring site with respect to showing the cumulative effects <br />of mining in this area. Review of the hydrograph of monthly flow measurements again shows <br />the lower than normal flows for the past six years. <br />Water at this site is a MgC a-504 type. Table 17 (Appendix A) shows that TDS values have <br />increased beginning with the start-up the truck wash facility (September 18, 1984). Since <br />then, TDS values have remained relatively constant. <br />For Site 2, TDS and sulfate values have been plotted on one graph, chlorides on a second, <br />and manganese (total and dissolved) on a third (Appendix H). Review of the TDS/sulfate, • <br />chlorides and manganese show typical seasonal variability with an increase due to the <br />start-up of the truck wash facility. <br />$DrlnCS. <br />Springs #1, 2 and 3. These springs ell exist along the Northwest Diversion Ditch (see <br />Exhibit 7-7 of [he Seneca 11 Permit Application Package). Review of Table 18 (Appendix A) <br />shows Spring #1 to historically exhibit a CaNg-HC03S04 type water with a relatively low <br />TDS value; however, no flow was observed at this site in the falls of 1987 through 1990. <br />Starting in 1991, this and all other native springs (i.e., not spoil springs) had their <br />annual sample taken in the spring (usually May) instead of the fall (usually September). <br />No flow was observed for Spring #1 for its annual visit in Nay, 1992. During 1992, Spring <br />#2 exhibited a CaNg-S04HC03 type water and en increase in TDS. Due to their location, it <br />is unlikely the[ either spring is impacted by mining. The last time that flow was noted <br />at Spring #3 was in 1984. <br />Spring #5. This spring is located in the Low Camp Creek drainage but, due to its • <br />location, is unlikely [o be disturbed by mining. No flo4 uas observed at this site in the <br />20 <br />