Laserfiche WebLink
• water quality parameters recorded at site 29. 2005 Water quality parameters for these sites are typically within <br />previously established ranges. <br />3.4 Saoil Spring Monitorin;? <br />Generally, groundwater migrates along bedding planes, faults, joints, or fracture zones. Given adequate head <br />pressure, if these zones of water migration intercept the surface, a spring or seep results. The TCC spoil spring <br />monitoring program was initiated in 1986 and is conducted annually. In accordance with [he approved plan, the <br />annual mine wide survey is conducted during May, with springs measured for flow and field parameters. If a <br />spring is discharging at or above 35 gallons per minute, it is monitored for the next year in accordance with the <br />monitoring plan. Two spoil spring sites, 7 and [he 303 series (303-1 through 303-3), require monitoring under <br />Exhibit 14-10. In addition to the spoil spring monitoring requirements, Spring 7 is monitored quarterly for field <br />parameters, and sampled on asemi-annual basis for water quality {if flowing). In 2005 site 7 did not flow. The <br />303 Spring series is monitored/sampled semi-annually far 5eld parameters and water quality. -- <br />Tables 50 through 52 provide summaries of the 2005 Water Year data collected at each 303 series (303-1 through <br />303-3) spoils spring. Table SOa provides a period of record statistical summary of collected data at site 303-1. <br />Figure 113 provides a graphical representation of period of record field conductivity for spoil spring 303-1. 2004 <br />water quality parameters for series 303-1 are typically within previously established ranges. <br />• 3.5 Natural Sarint; Monitorine <br />Two natural springs, SW1 and SW2, located over previously mined areas in the Southwest Mining District <br />required semiannual monitoring during 2005. Prior to mining, SW2 typically flowed throughout the year, while <br />SWl flows were sporadic. In recent years flows at SWl have been minor/limited, and in [he case of SW2, non- <br />existent. No flow was observed at either site SW 1 or SW2 in 2005. <br />In May 2005, a spring and seep survey was also conducted in the northem mining district [o identify potential <br />discharges [o Fish Creek. No significant springs were identified in 2005. The northem mining district is located <br />within the Twentymile Park Syncline. The predominant lithologic unit nearest the surface and occupying most of <br />the basin is the Lewis Shale, which can be upwards of 700 feet thick. The lack of significant bedding planes, <br />faulting, or fracture zones in this area may account for the lack of springs in the central portion of this basin. The <br />few seeps observed in the basin may be the result from surface weathering of the Lewis Shale, which may allow <br />some accumulation of water beneath overburden. This may result in a short period of seepage immediately <br />following spring runoff. <br />3.6 Mine Water Discharee Sites <br />• Two mine water discharge sites associated with the TCC operations are monitored. Site 109 requires quarterly <br />monitoring for flows, field parameters, and water quality samples, and site 1 ]5 is monitored as a CDPS dischazge <br />point in accordance with the requirements set forth under CDPS Permit No. CO-0042161. There was no flow <br />11 <br />