2020-01-31_PERMIT FILE - M2020008

• Permit No: M2020008
• IBM Index Class Name: PERMIT FILE
• Doc Date: 1/31/2020
• Doc Name: Application
• From: Scott Contracting Inc.
• To: DRMS
• Email Name: LJW
• Email Name: THM
• Media Type: D
• Archive: No

Rifle Gravel Pit #1 January 2020
Table 1. Estimated Mining Timetable
Estimated
Phase/Stage Anticipated Estimated Duration Depth/Thickness Type of
Start (feet)1 Overburden
Clay and silt; about
Phase 1 SiteJune—July 2020 Estimated 6" 6" of topsoil,
Development and May 2020 medium stiff,
Grading (1-2 months) across site slightly moist,
brown
No additional
Phase 2 Mining May 2020 June—August 2020 overburden will be
Preparation (2-3 months) removed during this
phase
Phase 3 Mining July 2020 July 2020—December 2026
17 feet—22 feet Varies
Extraction (7 years)
See Boring 3.
Remove estimated
5.5 feet to 6 feet of
Phase 3/Stage 1 July 2020 July 2020—July 2021 20 feet clay and silt; gravel
layer estimated at 7
feet to 27 feet
below surface.
See Boring 4.
Remove estimated
6" of clay and silt;
Phase 3/Stage 2 July 2021 July 2021 —July 2022 21 feet gravel layer
estimated at 1 foot
to 22 feet below
surface.
See Boring 5.
Remove estimated
2.5 to 3 feet of clay
Phase 3/Stage 3 July 2022 July 2022—July 2023 22 feet and silt; gravel
layer estimated at 3
feet to 25 feet
below surface.
See Boring 5.
Remove estimated
2.5 to 3 feet of clay
Phase 3/Stage 4 July 2023 July 2023—July 2024 22 feet and silt; gravel
layer estimated at 3
feet to 25 feet
below surface.
See Boring 1.
Remove estimated
2.5 to 3 feet of clay
Phase 3/Stage 5 July 2024 July 2024—July 2025 17 feet and silt; gravel
layer estimated at 3
feet to 20 feet
below surface.
Phase 4 July 2025 July 2025— December 2026 Not Applicable Not Applicable
(Reclamation)
1 The depths and thicknesses are estimated and based upon the nearest exploratory boring
logs included in Attachment A.
19