2021-02-03_REVISION - M2020008 ‎(4)‎

• Permit No: M2020008
• IBM Index Class Name: Revision
• Doc Date: 2/3/2021
• Doc Name Note: Part 1 of 2
• Doc Name: Request For Amendment To Permit
• From: Scott Contracting
• To: DRMS
• Type & Sequence: AM1
• Email Name: LJW
• Email Name: THM
• Email Name: AWA
• Media Type: D
• Archive: No

Rifle Gravel Pit #1 January 2021 (Amendment to File No. M-2020-008)
Table 1. Estimated Mining Timetable
Estimated
of
Phase/Stage Anticipated Estimated Duration Depth/Thickness Type d
Start feet ' Overburden
Clay and silt; about
Phase 1 Site 6" of topsoil,
April—May 2021 Estimated 6
Development and April 2021 medium stiff,
Grading (1-2 months) across site slightly moist,
brown
No additional
Phase 2 Mining May 2021 May—August 2020 overburden will be
Preparation (2-4 months) removed during this
phase
Phase 3 Mining July 2021 July 2021—December 2028 17 feet— 22 feet Varies
Extraction 7 ears
See Boring 3.
Remove estimated
5.5 feet to 6 feet of
Phase 3/Stage 1 July 2021 July 2021 —July 2022 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 2022 July 2022—July 2023 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 2023 July 2023—July 2024 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 2024 July 2024—July 2025 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 2025 July 2025—July 2027 17 feet and silt; gravel
layer estimated at 3
feet to 20 feet
below surface.
Phase 4 July 2027 July 2027— December 2028 Not Applicable Not Applicable
Reclamation
The depths and thicknesses are estimated and based upon the nearest exploratory boring
logs included in Attachment C.
22