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• 2.0 SITE DESCRIPTION <br />The BMRI San Luis Project is located on the western flank of the Sangre de Cristo Mountains, <br />approximately 4 miles northeast of the town of San Luis, in Costilla County, Colorado. The <br />topography of the site is steep and rugged mountainous terrain, with slopes ranging from <br />7 percent in the valleys to 20 percent along the ridges. The average elevation of the site is <br />8,600 feet above mean sea level (amsl). Annual average precipitation and evaporation at the San <br />Luis site aze approximately 12 inches (Benson, 1997) and 40 inches (Midwest, 1990), <br />respectively. <br />2.1 West Pit Post-Mining Hydrogeology <br />The post-mining existing hydrogeology and the hydrologic model for the backtilled West Pit are <br />presented in a previously prepared report titled "TR-26 Water Management in the West Pit Area, <br />San Luis Project, Costilla County, Colorado" (BMRI, 1999). <br />Generally, outflow from the backfilled West Pit results in elevated concentrations of sulfate <br />• manganese, floride, and TDS down-gradient from the pit. The purpose of this report is to present <br />a design for construction of a spray evaporation system that effectively lowers the water level in <br />the backfilled West Pit. <br /> <br />Ba11(e ,Lfountain Resources. /nc. DRAfT Shepherd ,Hiller, fnc. <br />p~vaa:e~.wppow~.p,.c~or 2-1 May21, 1999 <br />