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<br />seasonal water quality impact naspart sons were made }or Tuttle Draw only. Tha equation <br />used to compute existing and added chemi cal load is: <br />L-OxCx .0027 <br />where: <br />L - The chemtcet load Sn tans/day <br />0 - Crou1M or surface water flow in nfs <br />C -The T05 concentration in :eg/1 <br />A second equation presented by Ferrel ra (1984) was used to ealeulate potential TDS <br />increaaea. The equation is: <br />DSC - DSL <br />0xF <br />where: <br />DSC = Reaul tent df asolvetl solids concentration in n:g/1 <br />DSL = The awe of the dt ssolved solid loads for the contaminant source and the <br />.receiving sou roe expressed as tans/day and ealeul ated by the aqua ti on L - 0 x <br />~~ <br />• C x .0027 <br />0 = The sum of the contami Want and ranefving median flaw rates expressed in <br />acre-feet/day <br />F = A constant factor, equal to 0.00136. for converting the product of acre-feet and <br />mill igrams per 17Cer into tons <br />7abl es 17-16, 77-17, and 17-18 show the individual computations for same day (l rrigati on <br />season) impact analyses for mS ne di nehargea in Tuttle Draw, tndi vidual camputati ons for <br />came day (non-i rrSgati on season) impact analyses for mine dt scharges in Tuttle Draw, srM <br />i ndlvidual nanputati ons for impact anal ynea for mean annual mine dlsehargna in Tuttle <br />Draw, respecCi vely. Three inporCant poi nta can be wade from the above-referer:eed <br />computations. First, water quality iapants to the San Mi 9ue1 frw Nucla Mine discharges <br />Tnto TuEtle Draw are very mi ntmal (1 percent). Second, impacts based on mean annual flows <br />are a worst cane scenarl o. Lastly, the natural ground wsCer di seharge into the San Miguel <br />appears Co have a ai gnif scant degrading effect (29 percent increases in TDS) during the <br />irrigation season. <br />Having established that water quality impact asseasnenta based on scan annual f7 ow rates <br />17-64 ~ Revised 04/11/88 <br />• <br />REVISED MARCH 2006 Attachment 2.05.6(3)-2-74 <br />