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<br /> <br /> <br />Raton Creek Mine <br />1999 AHR -Page 2 <br />Surface water <br />Field and laboratory data collected from the approved monitoring point on the Starkville <br />Diversion are shown on water quality Table 4. Diversion flow measurements aze summarized <br />on Table 5. No surface flows were monitored in the permanent diversion during the reporting <br />period. <br />The approved surface water monitoring program effectively monitors the impacts of mining <br />operations on the surface water system adjacent to the Raton Creek Mine site. Monitoring <br />data documented through the period of this report indicate no significant impacts to surface <br />water as a result of mining operations. <br />Discharges to streams <br />Monitoring data for the one NPDES outfall for the reporting period aze summarized and <br />shown on to Table 1, below. Post-mining dischazge monitoring parameters include flow, <br />settleable solids, pH, and oil and grease under the approved Colorado Wastewater Discharge <br />permit. A review of these data indicate that all dischazges were within NPDES permit <br />limitations. <br />TABLE 1 <br />Period: lst Quarter 2nd Quarter 3rd Quarter 41h Quarter <br />Parameter <br />pH (ave.) No <br />Discharge <br />8.2 <br />8.1 <br />7.8 <br />Settleable <br />Solids (max.) <br />0 <br />0 <br />0.3 <br />Oil and Grease <br />visual none none none <br />Quantity (MG) 0.054 0.057 0.060 <br />Precipitation Information <br />Precipitation data for the reporting period is summarized and shown on Figure 3. Total <br />precipitation for the yeaz was above the average total documented in the permit application. <br />Storm events tended were intermittent, similar to the previous reporting period, and not cause <br />significant erosion or structural damage on the site. <br />