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<br />SENT BY: BOR-WCAOS SOj <br /> <br />8-16-96 4:53PMj 970 385 6539 -> <br />d a\ltt"W\ollWII "IIi .,,, <br /> <br />303 866 4474; <br /> <br />#18/22 <br /> <br />SWQBINMED Summary <br />August 12, 1996 <br />Page 16 <br /> <br />'The highest eonceotration of llIlleoiwn in two fish samples did meet the 12 io<a1a level of concern <br />associated with reproductive failure in fish... Some potential for adverse effects related to selenium. <br />are indicated by these samples. However, most of the mean concentrations of sediments <br />invertebrates, lII1d fi:lh IllIIIples from this river did not provide evidence lU ~lJgglIIt biom.gnificatio~ <br />to ccotoxicolosicalleve1s of CODCCm." WlIflo"ot fI8'U witlt tit. 6<<1II1II""'1'" II, yet",.u., limits <br />i$ .rr/llylir ttJ '1Ife4'1t' VllIIIG. SlCOIld.6>. WI lIok t"aI BOR's plOJecdnll.' i"dican III", .igllific4l1t <br />add/llo..1 1011. D/ ,IIis pDlll4llUft will .IItN tllb river from tll. Altllmu RlYer SlplJlCflIIl/y <br />i,lt:r.tUllIf lite ptJUlIIitd for a4vcrs. blolDglal eJled&. <br /> <br />San Juan River <br /> <br />ilitt:tOnfllitv ~dix <br /> <br />Table 19 (page 8-36) Ibis table lists the mean monthly water quality of the: San Juan Ri"er at <br />Farmington (0,8 miles below the mouth of the Animas Rivllf) for several parameters, including <br />dissolved and total trace elements. The me." WJluu for tot.l_clUJ' lor nu~ molllll ill wllldt <br />sa.mples were takot aceed till! NtMI Mf!JdaJ c1trollk Ml/Uer flUllitJl stllndlud. The mean monthly <br />value for total selenium for February exceeds the New Mexico water quality standard for total <br />recoverable selenium.. It is not possible to determine how many individl1ll1samples exceeded the <br />atandmds. It should be obvious that with the projcct..d increll5Cs in ...lenium and the likely increases <br />in mercury in the Animas River, the concentration w11hl.n The San Juan should also be expected to <br />increase as a result of this project. <br /> <br />Table 20 (Peae B-37) This table lie1& the JDtllID. monthly water quality of the San Juan River lit <br />Shiprock (below the mouth of both the Animas and the La Plata rivers) for several paramctots, <br />includiDi dissolved and total trace elements. The mean values for total mercury for every month <br />except [)ogcmbor, when DO samples were oollectt.d, exceed the New Mexico watcr quality srandard. <br />TbI mean InOIlthly values for tow selenium for February, March. Augustlll1d Ncr.'CInber excoec1 the <br />New Mexico chronic water quality standard for total recoverable selenium. It is not possible to <br />determine how many individual samples exceeded the standards. <br /> <br />Table 23 (page B-40) Tbia tablcusts the statistics for those 3IIlD.Jlles collected at the three statiOllS <br />on the San JUIID River. The sample meaD, 1he upper Illd lower 95% confidence interval, the <br />minimum. the maximum, the S1llIldard deviation Illd the number of observations arc !liven for each <br />disaolved and total trace element 7'1lelflinim_, maxllfUlm tllld - Wllacs.for lutal tfU:n:",y <br />., tile ".", rtlItiOIll ill New Maxit:o acee4 tit. cII,.",.;c will" 'lllflllty 8tarrdlUtl (the third station ia <br />located at Bluff, Utah and is not relevant to the New Mexico waler quality standards). The <br />maximum val~s fur total selenium at the FlImliniton and Shiprock stations exc:eed the New Mexico <br />chronic water quality standard as doe~ the lJIean value for the Shiprock station, It is not pussible to <br />tell from this table how many samples exceeded the standards. <br /> <br />\ r;, <br />. h3 <br />