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Rifle Gravel Pit#1 June 202 <br /> The reclamation of the property will be completed as each mining stage is completed and <br /> restored back to natural conditions upon completion of each stage of mining activities. Upon <br /> completion of all mining stages, Scott will cease dewatering in order to allow water to <br /> infiltrate the pit and create the final reclaimed pond condition. See Section 6 for additional <br /> information regarding reclamation of the property. <br /> 5.3 Mining Timetable <br /> Scott anticipates extracting approximately 1-2 million tons of sand and gravel over the initial <br /> (Stages 1 and 2) 4 years of mining. There are no incidental materials expected to be <br /> extracted from this site. <br /> Table 2 provides a range of the duration of mining by phase/stage, estimated nature, depth <br /> and thickness of the deposit to be mined and type of overburden to be removed. <br /> Attachment C includes the exploratory boring logs and material information. <br /> Table 2. Estimated Timetable for Stages 1 &2 Initial Activities. <br /> Phase/Stage Anticipated Start Estimated Estimated Depth Type of Overburden <br /> Duration <br /> Pre-Site Development <br /> Ground Water February 2021 Phases 1-3 Install at 10-12- N/A <br /> Monitoring (Stages 1 &2) foot depth <br /> Piezometers <br /> Phase 1 July—August Clay and silt, about <br /> July Approx. 0.5 feet to 6"to 1-foot of <br /> Site Development& 2021 20o 1 foot topsoil, medium stiff, <br /> Grading (1-2 months) slightly moist, brown <br /> July—August No additional <br /> Phase 2 July 2021 N/A overburden will be <br /> Mining Preparation 2021 (2-4 months) removed during this <br /> phase <br /> Phase 3 September September 2021 — <br /> Mining Extraction 2021 December 2025 17—22 feet Varies <br /> 4 ears <br /> See Boring 3. <br /> Remove estimated <br /> September September 2021 — 20 feet 5.5 feet to 6 feet of <br /> Stage 1 2021 July 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 logs included in Attachment C. <br /> 24 <br />