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r <br />paye 22Q <br />4.05.6(1)) <br />dam n. emha n!c~e nt Sn excess of LO feet in vertical height, <br />f r~+n t'ie bctt~~ of thr. chin n•:. [u the hntco.a of [he spillway, <br />or has a srrf~c., a~eu ;il ,h w:e t~•r! far in ex~zcs of .J <br />acres, thzn each ,lan sha 11 meat the apptira Sle reyalremznta <br />of c~nz State i:r.ei.ie:r ii accoraiancc with C.2.S. 77-d]-LJS <br />and following .i d .:.ti anal criteria sl~ali he met: <br />(a) An a,:pro;.-iate cc~hinacio^ of principal and <br />erne r;;z n•_y scillw~i;s ..;:iii bu providad for surf zce coal <br />m lning operations to safely discharge the cunoff rzsul[ing <br />f rcn s l0U-year, i4-ho~,~r preci~ita tlon oven[, or a larger <br />evr. r.t specified by the ~ivisi:~r,, plus in the cast of <br />ur.d ergrounJ mining activities, inflow from the undo r;;raund <br />m ln2; <br />(h) The ~s hu nka ent shall be designed and constructed <br />with an acceptable sta[Lc safety factor of at least <br />1.5, or .a highEi Fnfety factor as designated by [he <br />Division to ensure stability; and <br />(c) Appropriate b:~rriers shaiL bz provided to <br />co ;trot. seepage along conduits that extend through the <br />e:n bank enc. <br />(11) All aed is entatlon ponds, shall be examined by the <br />operator for structural vcakneas, erosion, and other <br />hat~erdous conditions. <br />(al For ;zd Sm ent noon po^d or i:o puundment with a <br />capa_ity of more than IUUU acre-feet, or with a da~a or <br />em ba n;cuen[ in ezcess of 10 fez[ in vertical 'neigh[, from <br />[he bottom of the channel to [he bottom of the spit lway, <br />or with a surface area at hiEh :.: '.z cline fa excess o? '20 <br />ac rte, examinu[ion a`.a 11 be in accordance with the applicable <br />requirements of the State Enginee[. In such rase, the <br />operator shall subait to the Division, proof of coupliance <br />wi t;+ such requirenants. <br />(b) For sedimentatloo ponds [hat do not meet the <br />criteria of 4.Oi.6(11)(a) above the operator shall exaaine <br />'ouch ponds and make quaterly reports to the Division or at <br />•uch other interval as approved by the Divfelon. <br />',) <br />ddb <br />2 CCR 40i -2 THE CODE OF COLORADO REGULATIONS <br />