2011-03-14_REPORT - C1982056 (3)

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peak flows observed. In general, an inverse relationship between flow and field conductivity was evident. 2006 water quality parameters for these sites were generally within previously established ranges. New surface sites SW-13, SW-14, and SW-15 (Tables 43-45, Figures 66-77) indicated elevated concentrations for total recoverable (TR) iron in early June 2003, however iron concentrations dropped dramatically (about an order of magnitude) by August 2003. With the exception of TR iron, none of the values recorded during the initial sampling episode fell outside the typical historical range of other surface sites on Fish Creek. In 2010 iron values ranged between 180 ug/L to a high of 1260 ug/L. This is typical for historical seasonal fluctuations, with spikes often seen during high runoff period, most likely relating to fresh erosion. Analytical data relating to these sites is discussed further in section 4.0 on Subsidence Impacts. Trout Creek: Three surface flow monitoring sites on Trout Creek are utilized. Site 301 is located on Trout Creek above the confluence with Middle Creek. Site 69 is located on Trout Creek below the confluence with Middle Creek. Site 1005 (established in 1994) is located downstream of the confluence with Fish Creek and is monitored in conjunction with alluvial well 008-AT-1. Tables 46 through 48 provide summaries of the 2010 Water Year data collected at Trout Creek surface flow sites. Tables 46a and 48a provide historical summaries of collected data at sites 301, 69, and 1005. Figures 92 through 101 provide graphical representations of water levels and selected water quality parameters recorded at each site. For the most part, typical seasonal flow patterns were observed. Water quality parameters for these sites are typically within previously established ranges. Middle Creek: 2010 data for site 29, located on Middle Creek below the confluence with Foidel Creek, is provided in Table 49. An historical summary of water quality data is provided in Table 49a. Figures 106 through 108 provide graphical representations of water levels and selected water quality parameters recorded at site 29. Water quality parameters for these sites were typically within previously established ranges. 3.4 Spoil Spring Monitoring Generally, groundwater migrates along bedding planes, faults, joints, or fracture zones. Given adequate head pressure, if these zones of water migration intercept the surface, a spring or seep results. The TCC spoil spring monitoring program was initiated in 1986 and is conducted annually. In accordance with the approved plan, the annual mine wide survey is conducted during May, with springs measured for flow and field parameters. If a spring is discharging at or above 35 gallons per minute, it is monitored for the next year in accordance with the monitoring plan. Two spoil spring sites, 7 and the 303 series (303-1 through 303-3), require monitoring under Exhibit 14-10. In addition to the spoil spring monitoring requirements, Spring 7 is monitored quarterly for field parameters, and sampled on a semi-annual basis for water quality (if flowing). In 2010, site 7 did flow on some occasions. The 303 Spring series is monitored/sampled semi-annually for field parameters and water quality. Tables 50 through 52 provide summaries of the 2010 Water Year data collected at each 303 series (303-1 through 303-3) spoils spring. Table 50a and 51a provide a period of record statistical summary of collected data at sites 303-1, and 303-2, respectively. Figure 109 provides a graphical representation of period of record field 12