2008-01-08_REPORT - C1980007 - Laserfiche WebLink

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West Elk Mine 2006 Annual Hydrology Report ~ laboratory analysis for total suspended solids (TSS), total dissolved solids (TDS), conductivity, pH, and iron (Fe [dissolved & total). The North Fork and Middle Sylvester Gulch monitoring sites have an expanded analytical suite, because of on-going characterization of the North Fork. The North Fork lab parameters include those listed in Table 2 plus alkalinity, carbonate, hydroxide, and ortho-phosphate. • • The current hydrologic monitoring plan incorporates a separate baseline monitoring schedule for new monitoring sites for approximately one year prior to mine operations expand mine development into new potentially affected areas (CDMG, 2006). The baseline monitoring schedule includes collecting monthly field water quality data, flow or water level measurements, and collecting samples for laboratory analysis (Table 2). Site-specific baseline schedules are dependent on site accessibility and mine development timing. In general, baseline monitoring is conducted monthly, generally from April through September in order to provide adequate data to show seasonal variations in water quality and quantity. Winter access to most areas at the Project area is impractical, so the baseline monitoring is generally not be performed from October through March. A summary of the revised baseline monitoring plan schedule frequencies is presented in Table 1 and the baseline laboratory parameters are shown on Table 2. Table 1. Monitoring Frequencies Routine Monitorin Baseline Monitorin Month Flow / Level Field Parameters Laboratory Anal sis Januar Februar March Rising Limb - Apri13 to May 13 Aril X X X Peak Flow - Apri121 to June 26 May X X X Low Flow -July 10 to October 8 June X X X Jul X X X Au ust X X X Se tember X X X October November December December 2007 HydroGeo, Inc.