Laserfiche WebLink
(Page 3) <br />The location or boundaries of the Porter Seepage Ditch and Olgilvie Seepage Ditch, which occur within the <br />permit and affected land area of the Lupton Lakes Resource were not marked or identified, as required by <br />Rule 3.1.12. This inspector also noted that the permit boundary along the drainage channel re-stabilization <br />was not clearly defined. The Division considers the matter of the permit boundaries for the Lupton Lakes <br />Resource not being marked or clearly defined to be a problem that will require corrective actions. See Page S <br />for Corrective Actions. <br />SW TKO/Lafarge was in the process of re-building the drainage channel east of the CDOT concrete box <br />culvert. The eroded channel had been re-graded and backfiiled wtth sub-grade or coarse fitter material. The <br />operator was in the process of laying down a synthetic filter fabric, then apptying Type M riprap. The re- <br />stabilization was approximately 50% completed at the time of inspection. (This inspector notes that the <br />operator has committed to submittal of certified, as-built engineering designs following completion of the <br />channel stabilization project. It will also be important for the operator to ensure that the re-stabilized channel <br />is adequately "keyed into" the box culvert at a matching grade.) <br />There was a significant gully that developed along the northeast edge of the drainage re-stabilrzation <br />embankment. It appears this was the direct result of recent irrigation tailwater discharge. A large debris fan <br />developed downstream of the gully, all within the permit boundary of the Lupton Lakes Resource. The <br />Division considers this matter to be a problem that will require Corrective Actions. Please see Page 4 for <br />Corrective Actions. <br />This inspector notes that the Division has previously required in the March 21, 2006 inspection report that <br />prior to any offsite discharge of mine water or discharge of mine water into the Porter or Ogilvie seepage <br />ditches, the operator must receive approval of ditch stabilization and erosion control plan for each route of <br />water conveyance beginning at the east edge of Cobrado Highway 85 Right of Way and continuing to the <br />point of discharge of mine water into the South Platte River. The ditch stabilization and erosion control <br />plan(s) must include a) evaluation of the current Flow capacity of each water conveyance structure, b) designs <br />& plans for stabilization, as necessary, c) designs & plans for outlet control measures at the point of discharge <br />into the South Platte River, and d) method for determination of how the volume of mine discharge water will <br />be monitored and regulated so as not to exceed the Flow capacity of the water conveyance structure <br />(seepage ditch). This inspector notes that the operator has begun to address these concerns; however, an <br />approvable plan for each seepage ditch has not yet been completed. (Please see attached correspondence <br />from SW TKO to Andrew Chavers dated April 6, 2006.) <br />I & E Contact Addres <br />NAME: Mr. Dave Jordan <br />OPERATOR: Lafarge North America <br />STREET: 10170 Church Ranch Way, S lit 00 <br />CITY/$TATE/Zjp; W e minste4 CO R007t <br />a: Carl Mount, DMG (via E-Mail) <br />Erka Crosby, DMG (via E-Mail) <br />Tanya Light, AGO (via E-Mail <br />Mr. Mark D Campbell, SW O <br />Mr. Robert Bruce, Laws & Bruce <br />Mr. Ronald L Griese CDOT <br />Ms. Dana Ortiz, Civil Resources <br />Mr. Andrew H Chavers, citizen/neighbor <br />Mr, Tony Finley, citizen/neighbor <br />Certified Mail Return <br />Receipt Request No. 7004 1350 0001 1636 6445 <br />Attachments <br />