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Mr.:Tony'Waldron <br />Division of Reclamation; Mining alid 'Safety <br />' 131:3, Sherman. St Room - 215 <br />:Denver CO 80203 • <br />e: : Response to D:RIVIS Letter'Pertain ngtocMinin 'O ' erut ' ",'with Ex ' - <br />002: _ P p � �ios'ed Gt:oandwater•: <br />M1979 ( North;: Delta:: Pit);; M1982034, :MIfeii110, . f192521'8 (Rich ' <br />:M198 6079 (M &G Pit); M1991035 '(Bluestone•Pit);•M1994045 (Bluestone: Pit)= <br />Dear , Tony: <br />• On behalf "0 Lafarge Vest ° Iar e• •L itin to:res `' • :::_ .. ' <br />.. nc:.,(Laf g )� • a in ,, g ` pond `fo - thy _•i� viion �of ReclamaX•iort,' <br />Mining,. .arid :Safety ..(DBMS letter: sent to *•L; - fa r ;wr ge on' rr1 0'`. , 2010 ;Yegardin mini ' ' b e ations <br />.) a.. <br />. with •- exposed.• groundwater; :'specific_ mining operations 'ljat :currently, expose<;' <br />groundwater.: In -ot•der - .;Lo:..mairitahh 'compliance , the .reiiuirements of =the ;0.O10rado'• Lan <br />R eclarriatioia Act for the .6:0tiorr of Con t <br />strucion Maerials an ahie,Mieral Ruls <br />e-and Re us <br />. Y ,.. . . . ,. .. ,....�, gulato <br />of'the . Coloxado .Mined,. oard- ;:for the Extraction- u :o;;£ -C grrstiuctiori Materials <br />• Lafarge is ;con`sidering :bondnrg, these; sites. tq jns_tall :a'• clay imer: or,'sl ' .wall .t' ' <br />• •gr os. :. Pursuant,to -b , <br />oundwater exp ure <br />s S' guidance Lsafar.ge2aT ticipates -that it,will ha ve up <br />. years phase in' the nevi!`boridingi {oc these to thr ee <br />A"prel mnnary.•estimate of•the:cost to install a liner. was: t 'T e:a <br />- ch i �e; 1� ttac}ied if gores <br />dhSplay how 'the. perimeter and''•depth `of the .- liners were e`s „tirtiat ; 0lie ;'c'' <br />• ed�' osts. �o£the,• linets'we <br />calculated assuming a; liner cost 'of $3 50'per square "`foot: The estitiiated iner'ctists at each` "site'are` <br />suriiniarized- below: -, <br />• , .North Delta Pith $•177,450 • <br />• • Miller Pit: $175 • - <br />• ri( ''Ricli:Pit: $271',320: ' <br />• M& 3 Pit: $655,20-0 • <br />• • • - Bluestone •Pit- (M1.991035) :'$1,680 <br />o - <br />At this we.'are unsure whether the wat visible on .4 —66-170.14. <br />.theea` <br />exposed „groundwater " or pooled surface • water Lafarge 'will be , conducting <br />.investigations in tte near term to ;de the source of the w ater: - <br />• Bluestone:: Pit,(41994045), $1029 ; 800• _ - <br />• ; o ;;Again, at this •time'we are unsure whetli_er'the water visible on aerial °photos of the., - <br />area is exposed :;groundwater'or pooled surface Water. 'Lafarge' will be conducting <br />• ^ investigations'in the near term: to- determine the source of the water, • <br />1499 West 120th Avenue Suite 200 <br />Denver, Colorado 80234 . <br />(303) 452 -6611 • 'Fait- '(303) 452 2759 - . <br />wwtN.apple <br />