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,. <br />i...~.,.w :s~.i ~ -#:b,: <br />Fichard D Lamm <br />Gov?rnor <br />June 23, 1982 <br />~~, .~ ~~ <br />~~ :o r <br />Mr. David P1cMindes <br />Colorado Yampa Coal Company <br />Bo:c 772129 <br />Steamboat Springs, Colorado 80477 <br /> <br />Frank A. Tr a')lor. '.!.C'. <br />RE: Letter of Approval for Se~:age Sludge Application on Fine Spoils <br />Dear Mr. Mchlindes: <br />The '•later Quality Control Division is in receipt of the su?porting data <br />submitted on June 18 and has cemple[_d reviear of [he application fur use <br />of ser:ace slu~Jce to enhance r.e~:c;e[aticn o` mine spoils at the °_'-:rr,.~ <br />Park Mine. <br />Analysis of Steamboat Spri.,gs' :iudga indicate that the sludge is <br />adequately stabilized and that the cor,centra[ions of heavy metals are <br />within or at [he limits speci`i_d in [he State Guidelines for Sludpa <br />Utilization on Land. ldhile conc.ntrations of copper are approaching the <br />racorrmended 4evel, the cumuia.~ve application should be•ritpin the levels <br />recor..mendad by EP\ (guidance document t1CD-61). <br />Federal regulations (CFa 40, Part 257 3-5) stipulate a minimum pH of [he <br />incorporated sludge/soil mi<ture of o.5 standard units. This restriction <br />is intended to inhibit migration of heavy metals into plant [issues and <br />ground rater. Application of agricultural lire may be desirable if sludge <br />and soil monitoring indicate values of less than 6.5 standard units. <br />Thy sludg-: will be surface applied a[ a rate of 21 tons per acre dry rreie:•.,. <br />No provision has been made for [he addi [ion of supple^entpl fe rti liter. In <br />[hc event [his is dasired a nitrogen balance should be submitted to the <br />Division indicating total ni [rcgen available for plant up tale and antici- <br />pated losses to vola[iliza[ien, mineralization and leaching. <br />I[ is also noted [hat no means of on-site s[oroge o; car to be avoi l,~61a. <br />If a[ sor.:e [i:ae you should ~.aish Co add en-site storage facilities, plans <br />and spcri Ficaticns should be submi t[ed [o [hc Division For acprovai. T!Zi; <br />letter of a;>p rc•:al shall remni~r in cffcU as Icr.n ns th•_r~ is na d~tri- <br />"r <br />c~ntai ,,, fey[ on [he envi rnnment. Approval dogs no[ rel i~._ ~irh~r tha <br />proaucor, S[~~~,~nboat Sprir.ns bins [r: r.~[er Traa then[ Plan[, or the u;dr <br />fJli,r,~o 'fanpa Coal Cur~pany, ,f abidinn i;y any o[''~~r Is:ri cr rar,ulatinns <br /> <br />1 <br />.. ~ .. - .. .-ti~~ e~ +~ <br /> <br />