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Rifle Gravel Pit #1 March 2021 <br /> The following table provides a range of the duration of mining by phase/stage, estimated <br /> nature, depth and thickness of the deposit to be mined and type of overburden to be <br /> removed. Attachment C includes the exploratory boring logs and material information. <br /> Table 2. Estimated Timetable for Stages 1 &2 Initial Activities. <br /> r <br /> opmentater Phases1-3 Install at 10-12- <br /> ng February 2021 (Stages 1 &2) foot depth N/A <br /> Piezometers <br /> Phase 1 Clay and silt; about <br /> May May—June 2021 6" of topsoil, <br /> Site Development& 2021 (1-2 months) Approx 0.5 feet medium stiff, slightly <br /> Grading moist, brown <br /> May—August No additional <br /> Phase 2 May 2021 N/A overburden will be <br /> Mining Preparation 2021 (2-4 months) removed during this <br /> hase <br /> Phase 3 July July 2021 — <br /> Mining Extraction 2021 December 2025 17—22 feet Varies <br /> 4 ears <br /> See Boring 3. <br /> Remove estimated <br /> July July 2021 —July 20 feet 5.5 feet to 6 feet of <br /> Stage 1 2021 2023 (gravel layer clay and silt, gravel <br /> thickness) layer estimated at 7 <br /> feet to 27 feet below <br /> surface. <br /> See Boring 4 <br /> Remove estimated <br /> July July 2023—July 21 feet 6" of clay and silt; <br /> Stage 2 2023 2025 (gravel layer gravel layer <br /> thickness) estimated at 1 foot <br /> to 22 feet below <br /> surface. <br /> Phase 4(Reclamation) July 2025 July 2025— Not Applicable Not Applicable <br /> December 2027 <br /> ' The depths and thicknesses are estimated and based upon the nearest exploratory boring <br /> logs included in Attachment C. <br /> 22 <br />