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WSP05172
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Last modified
1/26/2010 2:17:16 PM
Creation date
10/12/2006 12:53:50 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.106
Description
Animas-La Plata
State
CO
Basin
San Juan/Dolores
Water Division
7
Date
1/1/1996
Title
Correspondence regarding the Final Supplement to the Final Environmental Statement
Water Supply Pro - Doc Type
EIS
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<br />1 ;ENT BY: BOR-WCAOS SDj <br /> <br />8-16-96 4:44PMj 970 385 6539 -> <br />. .....II.......,.W tMlj .01 <br /> <br />303 866 4474; <br /> <br />#4 <br /> <br />SWQBfNMED Summary <br />August 12, 1996 <br />Page 2 <br /> <br />the Nc;w Mexico waler quality standards 8S reported in the Bureau ofR~lamation Water Quality <br />Appendix, &0.11& with the calculated hardne!ls ValUllli that correspond to these standarlb. Table B <br />lists the numeric water l)lRlity standws a~ delCl1l:lined by the New Ml:xico Environment <br />Department, with the corr~ponding hardness values when appropriate. Differenl;eS from the <br />correspon~ values in Table A are shown in bold in Table B, Significant differences wete found <br />for Copper (chronic and KUte), Mercury (chronic), Selenium (chronic), Silver (chronic and l1&ute) <br />Arsenic (chronic and acute) and Zinc (chronic and BCUte:), ' <br /> <br />The USGS WO for the Animas RiViJ' at CedIlr Hill i~ located 2,5 miles up6b:1lam from the New <br />Mexico/Colorado border_ The ~ometric mean of the hardness values collected at this Bage by <br />USGS for water years 1990-1994 is 196 mgIL, The geometric mean of the hardness values collected <br />on the Animas River at the state: line by New Mexico Enviromnent Department staffin August 1989 <br />is 203 mgl1,. Because of tile more complete !1lCOId, the hardness value derived from the USGS data <br />will be u~ed fOt deterJniqation of the hardn~-dependent stanc\a(ds for the purposes of this slImmaty. <br />IIm-dness values for the Animll5 Ri..~ at A:ltoc were W:tennined from :IlID1ples collected by NMED <br />in 19119 II; 1991, The geometric mean of these hardness values is 221 mg/I.. <br /> <br />For the purposes of this summary, hardness values for the La P!lIta RiVEr at the New <br />Mexico/Colorado border were determined from siIIIlples coll~tcd by NMED in 1989 and by USGS <br />in 1969-1981. The lleome1ric mean ofthege hardness values is 570 mgIL. Hardnesg valu~ for the <br />La Plata RivCl at Fam1ineton wm determined from samples collected by NMED in 1989 and 1990. <br />The geomc1rlc mean of these hardness values is 474 mgIL. The fonnulae for the New Mexico <br />haroncss-dependcnt standards are only valid for hardness values between 2S-4oo mgIL_ l For values <br />above 400 mgll, 400 mg/T, is The hardness value used. No hardness values are available for the La <br />Plata Riv~ at La Plata, Allen Artoyo or Jackron Lake, but it is llS6umed that the ha:ulne5ll values at <br />these stations would also exceed 400 mglI., since the hll1dness values at the upsm:aro lInd <br />downstream stations both exceed 400 milL, <br /> <br />Wstor quality Itandwda for the La Plata Rivor al 11110: Nc;w Mell.ico/ColoIado Irtate line as shown in <br />the Bureau of Reclamatiou (BOR) Water Quality Appendix arc limited to those let by Colorado. <br />WateI quality at this station mu.~t meet and should he compared to the New Mexieo ~..tcr quality <br />IltaMlU'ds, We note that BOR is iU\lOI1slslent in its application of staW water quality standards, The <br />Water Qualit}- Appendix c;omparcli ~ wa1er qlllliity data eollected at the Animas River at Cedar Hill <br />station to the New Mexico water quality standards, even though the USGS gage is actually 2.5 miles <br />upstream from the state line, The station on the La Plata River is actually right on thc state line, <br /> <br />3 8M 40 CFR. 131.36(c)(4) vm.ich gi\'e!I the regulatoI)' mandate for Clean Water Act Section <br />304(a) pollutants.' It is likely that such limitations would also apply in Colorado. <br /> <br />7~3 <br />
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