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State Req. <br />ie p ,conductivity, and temperature from March through ctober. rest <br />stage gages at each of the sites record peak flow stage heights which are <br />related to volumetric flow rates via rating curves developed from channel <br />Sites SW~2-I, 2, 5, and 6 are monitored monthly for instantaneous flow and ~ ~e~h~ <br />f' Id H O ~ ~ <br />from the monitoring program because the site monitors runoff from undis- <br />turbed land and the data collected have no relevance to the mine. ~. ~ <br />.~ <br />~' r <br />surveys and the Manning equation. These rating curves are presented in <br />Addendum 7-IOA to Appendix 7-10 of This permit revision. <br />Site NPDES 002, 003, and 004 are monitored for the parameters flow, total <br />suspended solids, total iron, salinity, pH, oil and grease, and floating solids <br />according to the frequerxy and terms stipulated in NPDES Permit No. <br />CO-0000221. Flow at sites NPDES 002 and 003 is monitored continuously <br />via H-flumes and Stevens Type F water level recorders. Flow at NPDES 004 <br />is monitored continuously via a Parshall flume and a Stevens Type F water <br />level recorder. <br />All the surface water monitoring sites except SW-S2-2 and SW-S2-6 are <br />sampled tri-annually for the "short" parameter list presented in Table <br />7-10-9. Sites $W-52-2 and SW-52-6 are downstream of all mining related <br />disturbances and are consequently sampled tri-annually for the "long" para- <br />meter list presented in Table 7-10-10 which includes the trace elements <br />aluminum, arsenic, boron, cadmium, copper, lead, mercury, molybdenum, <br />phosphorous, selenium, silicon, and zinc. The different parameter lists were <br />approved by the CMLR staff on April 4, 1984 following a review of the <br />historic water quality data. The first iri-annual sample in each year is <br />collected prior to peak runoff, the second sample is collected after peak <br />runoff, and the third sample is collected during baseflow conditions. <br />Samples are analyzed as per U.S. EPA (1979). <br />All surface water monitoring sites will be properly maintained by qualified <br />personnel. Following reclamation bond release, all monitoring equipment <br />will be removed and the sites will be regraded and vegetated. <br />7-10-23 <br />Revised February 22, 1985 <br />