PERMFILE121480

• Permit No: M2003091
• IBM Index Class Name: Permit File
• Doc Date: 1/16/2004
• Doc Name: Adequacy Review #1
• From: DMG
• To: LaFarge West Inc
• Media Type: D
• Archive: No

Rule 6.4.7(3). In addition, please submit a copy of the source of the water rights obtained by
Lafarge to supply the project water requirements for the mining operation and reclamation.
26. Rule 6.4.7(1) requires the operator to directly state if surface water or groundwater will be
affected by the mining operation. The applicant did not locate any wells within 600 feet of
the affected land. Lafazge will need to identify all wells of the surrounding area to determine
if any maybe impacted by the mining operation. In accordance with Rule 6.4.7(2)(a), please
identify all of these wells on the map(s).
27. In accordance with Rule 6.4.7(2)(b), the Division requests that the applicant identify and
characterize the aquifer to be mined in or through. The Division also requests that the
applicant define or predict the cone of depression expected for any areas to be dewatered and
dry mined during the life of the operation. The cone of depression assessment should defime,
at a minimum, the horizontal and vertical extent of drawdown expected. If during the
assessment, the applicant determines that a drawdown will occur offsite that may impact a
current groundwater user, the applicant should explain any mitigation measures to be
implemented and trigger points that would put mitigation measures into effect.
28. In accordance with Rule 3.1.6(1)(a), please explain how disturbance to the hydrologic
balance will be minimized during the mining and reclamation phase of the Duckworth Pit.
Please explain how Lafazge will be in compliance with Colorado Water Laws and regulations
governing injury to existing water rights. Please inform the Division as to when a Temporary
Substitute Supply Plan, Well Pernut and Plan of Augmentation will be obtained from the
Division of Water Resources. The Division received comments from the Office of the State
Engineer (OSE) regarding the application. The letter is enclosed for reference. Please
acknowledge the conditions for approval noted by the OSE.
29. Please explain how water from dewatering of the Duckworth Pit will be managed to protect
against pollution of surface of groundwater both during and after the mining operation (Rule
6.4.7(2)(c)).
30. Please identify all ditches within 200 feet of the affected land. During the Division's
inspection of January 5, 2004 some ditches were noted within 200 feet of the affect land but
were not identified on the map. Please locate these ditches on the appropriate maps and
further explain the ownership of the ditches. If any ditches are to carry water as a result of
the mining operation, please submit a written consent from the owner of the ditch that will
allow for the use of the ditch for conveying dewatering flows.
31. Lafarge states that the Duckworth Pit is within the 100-year floodplain of Boulder Creek.
Please provide the flood elevations(s) to be expected under a "worst case" flooding scenario
and specific mitigation measures that will be implemented to minimize the potential for any
offsite impacts. Legible copies of the Flood Insurance Rate Maps ("FIRM") through the
mine reach would facilitate the Division's review.
Rule 6.4.8 Exhibit H- Wildlife Information
32. Rule 6.4.8(1)(a) of Wildlife Information requires the Applicant/Operator to include a
description of the significant wildlife resources on the affected land. Please specify the
significant wildlife resources on the affected land. In developing this information, the
Applicant/Operatorrnay wish to contact the local wildlife conservation officer.