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October 2012 Page 1 -6 <br />All sediment ponds and direct discharge points are permitted under NPDES Permits <br />CO- 0000906. Sampling stations for this permit are described below. <br />NE -001 is a grab sample station from the New Elk Mine water discharge V -notch flume <br />located on the Purgatoire River for NPDES Discharge Permit CO- 0000906. The station <br />monitors the quality and quantity of mine water discharge from the New Elk Mine. During the <br />third quarter of 1989, the mine was sealed and the discharge of mine inflow water was <br />terminated until pumping resumed in December of 2008. <br />Table 1 -2. Water Quality Parameter Sample Suites for New Elk Mine <br />Field Measurements NPDES Biomonitorin <br />Flow rate /water level depth <br />Frequency and parameters in accordance with NPDES Permit <br />H (S.U.) <br />Conductivity (umhos) <br />Temperature <br />Sediment Pond NPDES List <br />Frequency and parameters in accordance with NPDES Permit <br />Short List <br />Sodium Adsorption Ratio (SAR) <br />Total Suspended Solids (TSS) (m 1)2 <br />Sewage Treatment <br />Total Dissolves Solids (TDS ) (m 1) <br />Frequency and parameters in accordance with NPDES Permit <br />Carbonate (m g/1) <br />Bicarbonate (m 1) <br />Chloride (m 1) <br />NE -080 PRS -4 <br />Sulfate (m 1) <br />Frequency and parameters in accordance with NPDES Permit <br />Manganese (Mn) (m 1) total, dissolved <br />Calcium (Ca) (m 1) <br />Magnesium (Mg) (m 1) <br />Potassium (K) (m 1) <br />Sodium (Na) (m 1) <br />Iron (Fe) (m 1) total, dissolved, total recoverable <br />Hardness (calculated) <br />From Table 28, New Elk Permit C- 1981 -012 <br />2 Surface water only <br />NE- 001 -G: NE -001 -G is a site under NPDES Permit No. COG - 310069. This site was <br />used to discharge water from remedial activities at the UST facilities area. NE -001 -G was <br />sampled at its outfall prior to discharging into ditch D -16, which flows into Pond NE007, a site <br />monitored under NPDES CO- 0000906. This site was eliminated during 1999 with reclamation <br />of the remediation systems and termination of Permit COG - 310069 was approved by CDPHE. <br />NE -004: A grab sample station of the discharge from the primary spillway of sediment <br />Pond 004. This site predominantly handles stormwater runoff from the New Elk underground <br />development waste pile. <br />