Laserfiche WebLink
<br />: <br />~ iii iiuiiiiiiiiiiii <br />~ <br /> <br />GREG LEWICKI AND ASSOCIATES <br /> <br />November 30, 1993 <br />1645 Court Place <br />IJ9J Suue 309 <br />J E C 0 3 JJ Denver, Colorado 80202 <br />Phone/FFU((3031629-9335 <br />Wally Erickson _ - .-.. ._.-,_.~'Jr,;r <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street 2nd rioor <br />Denver, Colorado 80202 <br />Re: Closure work <br />at Trinidad Basin Mine <br />Dear Waliy: <br />I delivered the mylar for the TBM site to your office while you <br />were out yesterday. It should be helpful to you in the landowner <br />notification of the final reclamation items. <br />I have received the letter Dated November :,,. 1993 to Garv r;anisch <br />from Dan Hernandez. i disagree with the need to conduct, slope <br />stability analyses on the impoundments leading to Pond 22-P4. The <br />reascr,s =e•- this belief are stated below: <br />1) The three impoundments are actually old sediment ponds 22-P5, <br />22-P6 ar.d 22-P10. These Bonds have apa~-oved P.E. designs in the <br />oermi~ -coated in the ubmittal of A:.a~~s~ 25. 1980 b~~: '~~era' <br />resource - _ Er~gineerin~. _. -~:.e _.. ;,, :, -_ ~:. <br />designs are 8009-54, 8009-58 and 8009-S8. <br />2i ~!-ese oo~~us Nave bee ~:~ place ,.inct '98S ~r~d ha':e ... -...:nac <br />admi~ab w-:in no ma~n~enance whatsoeve- <br />~i As s o~~.ofessionai Eng-reer invo~veo w-~ta the site ~ _::y <br />nears. ~ can tell you that, these emban4.~,encs are free o= crack~n5. <br />ouiging, >e~,.,:,c:N. any ot~~~er s:y,ns of instao- -~y. <br />would be w-.. ;i~ __ _ „ Documents as a ._. tnac 'they ar-e sr.able <br />for oermane:a. retention. The embankme.^.t;`~hemselves were ~_.uai'v <br />the Haul read for the „rucks leaving the ~.~ ~~p area. -rey were <br />connstructed with extremely heavy equipment and good compaction was <br />..l I IG\.G~^ <br />=1 ~`!E an ,:)'N'ler 7S i;n.eiV `.G sign a wafer absolv-~ng ar:ydnc Oi <br />:,.tore -a^,ercussions, snoulc drobiem a:it!: t^e ponds r.'r--,, .= cc <br />-,-:~ a:,.ne ~ .~,:ld warrar:t tl~e slope stad- :tv •.nalvses unn~c-assa%v <br />of When all ponds on the west side of the nrcoert, were des~cnar.ed <br />•~c re,.~a:r~. no slope stab i i icy analyses were conducted- i ~ _: ue <br />-. .: ..... .._ee-~. ::.,yes e:.:-~~ or r. .,_t.. ., ., _. ..-- <br />...:.. ~_ __ _..- _. _. sre ~-:o ess st_.,ie. A. _. _,c~~ec ,uc.-.. :_.: <br />... _. .. _.. .._•'e _. ,_ ~ r..:ceot ion.. ~ .+e-~ <br />