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13GU1462 — Rock Dust Silo <br />See Rock Dust Usage — 12 Month Rolling Totals <br />History: <br />02/14/2013 — Submitted original APEN <br />10/07/2013 — Received Initial Approval for Construction Permit <br />12/17/2013 — Submitted O&M Plan <br />03/06/2014 — Received Approval of O&M Plan <br />03/11/2014 — Received Final Approval for Construction Permit <br />11 /24/2015 — Submitted Modification to limits <br />03/24/2016 — Received Final Approval for modified construction permit <br />01/01/2018 — Submitted Renewal - No further correspondence from CDPHE. <br />12/01/2021— Submit APEN Renewal <br />13GU1463 — Office Generator <br />History: <br />02/14/2013 — Submitted original APEN <br />10/07/2013 — Received Initial Approval for Construction Permit <br />12/05/2013 — Submitted O&M Plan <br />12/11/2013 — Received Approval of O&M Plan <br />12/02/2014 — Received Final Approval Letter <br />10/19/2015 — Submitted Permit and APEN Cancellation Request — Per CDPHE website — <br />"Permit Exempt, APEN Exempt" <br />14GUO697 — Deer Creek Escapeway Hoist <br />History: <br />03/07/2014 — Submitted original APEN <br />10/20/2015 — Submitted Permit Cancellation Request — Per CDPHE Website -- "Permit <br />Exempt, APEN Only" <br />02/07/2019 -- Submit APEN Renewal <br />