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Cotter Corporation Water Quality Assessment CO-0036251 Table A-5 Site-Specific Metals Water Quality Standards For CO-0036251 Based on New TVS Equations Based on the Table Value Standazds Contained in the Colorado Deparhnent of Public Health and Environment Water Quality Control Commission Re ulation 35 Calculated Using the FoIlowing Value for Hardness as CaCO3: I 22 3 mg/1 1.,..^y.:,F.§( +~ SS y, s.i-~vx St~?,~{t~~~~y+^' ~:~ ebb rParam~ter ~ `' aY b~ i+ ' :ti ~ t-. ~ A d n Stream~Wa[ere,. w ~~ ~ ' ~~; y {~jYr~ rT ° .~ } ~~'~~. R 3,~ aX' 7' ~ -~~(` Y~if Y`. sir,y~7~~.Y ~.. 5,~. ~;~~ ~~~~~~~*~ "'. ~" k i ''~ =~~'~ ~ ~ ~r` ~ r ~ ~, r ~';' 'r ~ , h s ~ ~ual t Sfanda d ~ c ~ ~ .~~ ~~ ~ .;~ . ~m layllsed ~ t 1 ` A ~ ~ ~„~ ~~~ ~~,~~ ; x ~ i yv r ~lt o ~, „ , ~,~,ti n4 ~~,„„q u ~,.~ ~ Aente l0illg/1 [1.13677-0.04184In(hardness)][¢(1.128(ln(hardness))•3.6867)] Di l d d sso ve Ca mirm3, Chr0171C 4.O~llg/1 [1.10167-0.041841n(hardness)][e (0.7852(ln(hardness))-2.715)] Trivalent Chromium, Acute 1099ugQ e(0.819Qn(hardness))+2.5736) Dissolved Chronic 143ug/1 a (0.819(ln(hardness))+0.5340) Hexavalent Chromium, Al:ute t 16UgJl Numeric standards provided, formula no[ applicable Dissolved C]]IO1nC 11 lug/1 Numeric standards provided, formula not applicable Acute 29~Ug/1 e(0.9422(ln(hardness))-1.7408) Di l d C ' sso ve opper, I 1 8 5 h d ni ng n( .7428) (0. 64 ( ar ness))- Acute 153jug/1 [1.46203-0.1467121n(hardness)][e (1.273Qn(hardness))-1.46)] l d Di d sso ve Lea , ~ ChrOI11C 6.O;llg/1 (1.273(In(hardness))-4.705)] [1.46203-0.1457121n(hardness)][e Acute ! 923jug/1 (0.846(In(hardness))+2.253) e l k Di d i l c sso ve N e , ChrOII1C 103 ~ug/1 a (0.846(In(hardness))+0.0584) Di l l d Aente 1 8 llg/1 Numeric standards provided, formula not applicable sso ve enimn, Se Chronic 4.6~ug/1 Numeric standards provided, formula not applicable ACUte 8.1'Ug/1 z e(1.72(In(hardness))-6.52) l il Di d sso ve ver, S , CbI0i11C 1.3ug/1 a (1.72(In(hardness))-9.06) Acute 231+Ug/1 e(0.8473(In{hardness))+0.8618) l d i i ve nc, D sso Z ChiOIllC ; 233u /1 e(0.8473(ln(hardness))+0.8699) g To conduct an assessment of the ambient water quality in the Dolores River, data were gathered from WQCD sampling location 85 (Dolores River above confluence with San Miguel) located approximately 3.5 miles downstream from the confluence of East Pazadox Creek with the Dolores River. Data from this location were available for a period of record from January 1990 through September 1994. Data were also used from USGS water quality station 09169500 (Dolores River at Bedrock) located approximately three miles upstream of the aforementioned confluence, and covering a period of record from October 1995 through April 1997. Although these data reflect ambient water quality in the Dolores River after the confluence of the dischazges of the Cotter Corporation, in the absence of other neazby comparable data, these data are used as a conservative estimate of upstream ambient water quality. These data are summarized in Table A-6. Appendix A Page 7 of 13 Final