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~ January I6, 2(11)4 Memo to Erica Crosby Pcrn)it Nc~. ~•I-2003-021 Duckworth f?it Setbacks wtd Ditch See a e _ - - M ntcd Pace I+1! 17epttr iuiiiiiiiiiuii rill riiniiii..niiiairiiuiaia i.uaia n.na~iuiia is uiiiuiii. u. ii.uuuiiiiiiiii iiiiiiiiiiiiiiiiiiiirairiaiiiii Icl tictbuck to 17itchrs it'Opctuun \lincs to a Vertical ur near Vertical Pit Wnll. s . J] - l 1 Un-Excovatcd Vmivc `lumriul (not backtill) ................... (dl Operator may ;Arne to o Vertical Pit Wall us Illuxtrated in l'mss-Scctian (cl. but most ~1ine at .: once Inside the Lune where the Hunrontul Dismnl' rocs the PrJI)rpth, SOdnot Ditch tictbuck Murkcr is less titan "fhe maps provided with the perntil applicuuon show a simple h0-foot setback to most sul+clures, including Idaho Creek. No setback liom the Smith anJ Emmons Ditch is shown un the nr.+ps. Rather, the application states that this ditch will be mined through and relocated to the west edge ufthc property. However, the Ditch ('ompany has yet to consent to the rclocatton of the ditch, and until written consent ul'the Ditch Company is provide(I to Di\1G, the Applicant must commit to an enR)rccablc setback liven the Smith and Emmaus Ditch. For consistency. the same setback distances shoul(I he specilicd liir both the Smith and linutums Ditch and Idaho Crock. fhe mining plan map includes a list of extraction standards fur the Duckworth f'it, one of which sWtcs that no cxcavatian or processing of sand and gravel will he pcmtittcd within lU Icct of an casentenl. According to Ihu Ditch Company, the casement tix the Smith and Emmons Ditch is 70-Icct-wide being 35-feet-wide on each side of the ditch.:\ccordingly, the setback required from the Smith and Emn)ons Ditch under listed extraction standards as permit conditions would he as illustrated in the following cross section. c_ Ytinal hoer lcasctnrnt Measured Approa 1?uscrncnt tiom t'rnterhne of '+Sdcct Linc Dnch