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<br />Mine Plan. An average deity ground water Snflow of 5,229 fC3/day was ealcul ated for year <br />1•^ 5. 7o assess the impact o} tats inflow on Calamity Oran and the San Miguel water quality <br />durS ng mining, SL was assumed that the entire flow xas dt scharged into Calamity Draw and <br />the San Mtguat River and that the TDS level for the overburden aquifer was representative <br />of the chant cal load. Tables 17-SA and 17-SB show the water quality impact computatf one <br />for Calamity Draw and the San Mi goal River, recpecti vply. The eonputationa aro based on <br />equations Dresented 6y t'erref ra (1980) and are expl ainad Sn detail in thn sactien of this <br />Tab on 'Potanti ai Impact of Replaced Spoils on Surface Water Ouality". The duratf on of <br />the hater quality impacts is relatively short term (5 years) and 73aa si gnificanca of Ehe <br />fmpact is neglSgible as T0.5 increases in the range of only .OB to 1.5 percent are <br />projected. These Drojeeted changes in TDS levels will in m wsy affect the present and <br />potenCS al uses of the cur}acs water and era so small that they will not 6e measurable. <br />Water quality impacts to TuCEIe Draw and the San Miguel RS var et its confluence with <br />Tuttle Draw are addressed in the sactT on on '4otentf a7 Impact of Replaced Spoi la on <br />Surface Water pualtty" as DumDage of ground water inflow at the Wuele mining area is not <br />necessary, <br />Impact of Spoil Water OualitY on the Ground and Surface Water Quality. <br />Introduction. This Tab contai na a daterninati on of the Probable Hydrol agic Cpnsequan<aa <br />•` <br />of the exi ati ng end proposed mint ng plan on the quenti ty and quality of su rfaee and grauM <br />water to the parnit a:x1 adjacent areas. The folloni:g di scuceton is d7vided into siz <br />cacti one. They are as fall owe: 1) overburdens interburden and underburden <br />characterization; 2) the controls on ground water qua7fty, including machanl ems far the <br />production of acid, mineralogy and neutralSZatS On potential; 3) gaocheM cal modeling; 4) <br />the effects of irrigation on the ground and surface hater chemistry) 5) potentiai impacts <br />of replaced spoil on ground water quality; and 6) potanti el impacts of repl sced spoil on <br />surface water quality. <br />Regional and site-specific geologic and hydrologic .data were coil acted and analyzed to <br />assess the effects of mi nl ng on the potential <ontemS nation and dint nuts on of ground and <br />surface waterc; the presence of acid-forming or tort e-forming meters aln and their effect <br />on ground and curfaca raters; the downstream aveilebi li ty and quality of water whl ch is <br />used for domectlc, agricultural, industrial or any other such purpose; aM the potential <br />ioryaets eo the hydrologic Dalenee. The study area includes the Ruela and Nuela Eeat <br />m7 ni ng areas and the surrounding region bounded to the south and west Dy the San Miguel <br />77-30 Revised 04/77/88 <br />• <br />REVISED MARCH 2006 Attachment 2.05.6(3)-2-38 <br />