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1 <br />1 <br />1 <br />1 <br /> <br />1 <br />1 <br /> <br />1 <br /> <br /> <br />1 <br />1 <br />1 <br /> <br />1 <br /> <br /> <br />William J. Carter March 12, 1998 <br />Re: Response to Susan Burgmaier's comments on the 1996 Annual Hydrologic Report <br />Graph 2. SC-1, SC-2 & SCE Total Dissolved Solids <br /> SC-1, SC-2 8 SCE Total Dissolved Solids <br />16000 <br />/ t t Jr £'-0y~ $+r~ y/~ ?J Wy'R `1 F:: .J .,,i~•~5('~.,~y~y.(~~Y`SS.pl'ih'a"!~? .f1 { >ti . <br />i. <br />` <br />'~ <br />~ ~ ~~~ <br />~ • <br />~ <br /> f <br />\TK>!~ R4 <br />~ <br />4 i ~ <br />} .- ! f <br />J ~ <br />141)00 .i. <br />r F <br />~ 3 ~ Alir r ~ i <br />v <br />'si'~'r ~a~ ~~ <br />.v <br />t 2t)0~ . <br />~ <br />y <br />. <br />„, <br />, . <br /> ~ "NI`~. N'l."'"'rY:S ~ Uy. <br />~J~~i' "lI ~~~..if"~~ <br />'~ " I~' <br />~•~~ 5 d <br />y~ ~ <br />t t ~ ~r <br />10000 y <br />n <br />tt aG <br />, <br />i <br />~ <br />" <br />~ <br />~ -C <br /> ,~~"~, <br />,! ,, <br />~ w' ~ n r' <br />} <br />~ ,~_~< t " <br />j{Y T "•~' I'I ~ MJ :l+lt}J l !% ti ~}P SS Y/(M S-W 4 IL ' SC-1 Well <br />Q <br />.. <br />Y Xt +S Y I' h >-0 tIM1SY V Y r ~-SC-2 Well <br />8000 <br />H » <br />~ ~ f UA 4{Ip.r:h+4~t 4 ~: $'f Ati u`;,?s» tt ti 3 <br />rw <br />J, a <br />. ,~..~+, ~, v ~ r~ J.>~~ r <br />~ryr{.~, ~ , Y'>~` <br />~_ ~ -~ " <br /> <br />SC-4 Well <br />6000 ~ <br />~ <br />:, <br />' <br /> ~yy~ <br />,IJ/:Y 4SitY'/ 5 ~ ~ ~ l ?. sfF~~~ <br />l ~f L'.n ~.a ~c "off ~t Na^y~T.$~piG ~l y! ~~ ~ .4X <br />i <br />; <br />1 <br />f~(i/If <br />I.T <br />. <br />4 ~ <br />I'T <br />. <br />l <br />J <br />~ <br />J <br /> l ~ <br />x Y-0F`# <br />y <br />, <br />d <br />y <br />~ <br />, <br />)1 {w <br />T <br />C <br />~ <br />l <br />! 2£ <br />(/ <br />' <br />1~f ^i <br />Il <br />41]00 ( <br />A <br />y <br />+ <br />~ ~.-0..F"t/1 ~,".~IBM~~ 1 +c' `J"~t~„~-{xJ I ~ '! ~(! <br />`r f S tY. ~ y }~.R <br />~ <br />9 <br />~~VY _S. ~yk,l~ <br />< <br />~ <br /> . <br />~ <br />G/ <br />i,Y M1({ I ~ ^v ~j <br />M t. ~U <br />1 hT ~b G-` Z Y~ <br />201]1] r ~~ Y S.~ y' ~F~' }, A Y~>SS ~ }~0. l ~P~~y' L')~Sj ~`~ ~,~yfu ~ }f ip ~ <br />Y <br />t'F '~' <br />~'Z <br />~# <br />a <br />r <br />'x'~ <br />" ~ <br />~ '' <br />u <br />(] ~~ <br />} <br />i <br />. .,~~ <br />4G "L- <br />3.,. 4C, <br />`i. <br />3_t -r'ly <br />. \:.e.. <br /> <br /> <br /> <br /> Date <br />Comment 4. <br />"Monitoring data for 1996 shows TDS values increases between NF-1 and NF-2, the upstream and <br />downstream monitoring sites on the North Fork of the Gunnison River. No discussion is made as to <br />what might be causing this increase. It is possible that the Bumping of water in the mine to decrease <br />total suspended solids is contributing to increased TDS in the minewater discharge, which would <br />elevate TDS in the North Fork. Has OCM looked into the TDS increase?" <br />Response 4. <br />As explained in the response to Comment 2 above, the mine water discharge, Outfall Ol 1, flows into <br />Sanborn Creek approximately 100 yards above the North Fork of the Gunnison River. Monitoring site <br />S-1 is just above Outfa11011. Monitoring site S-2 is below Outfall Ol 1, at the culvert under Colorado <br />State Highway 133. Monitoring site NF-1 is upstream of Sanborn Creek, the infiltration field for the <br />water supply to the mine and the Town of Somerset, and the Sanborn Creek l~fine portal area. <br />Monitoring site NF-2 is downstream of Sanborn Creek approximately 250 yards. <br />Since Sanborn Creek is an ephemeral drainage, there is flow at S-1 during the snowmelt runoff period, <br />typically beginning about March and ending about June. During the rest of the year, the only flow th <br />9 <br />1 <br />