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Table 2. Estimated Timetable for Phases 1-4 Activities. <br /> Phase/Stage estimated EstimatedType of Overburden <br /> Duration D' h <br /> Pre-Site <br /> Development Installed at 10- <br /> Ground Water Phases 1-3 12-foot depth N/A <br /> Monitoring <br /> Piezometers <br /> Phase 1 Approx. 0.5 Clay and silt; about 6"to 1-foot of topsoil, <br /> Site Development 1-2 months feet to 1 foot medium stiff, slightly moist, brown <br /> &Grading <br /> Phase 2 2-6 months N/A No additional overburden will be removed during <br /> Mining Preparation this phase. <br /> Phase 3 4-6 years 17—21 feet Varies <br /> Mining Extraction <br /> 21 feet See Boring 3. Remove estimated 5.5 feet to 6 <br /> Stage 1 2—3.5 years (gravel layer feet of clay and silt overburden; gravel layer <br /> thickness) estimated at 7 feet to 27 feet below surface. <br /> Stage 1 2—6 months NA NA <br /> Reclamation <br /> 21 feet See Boring 4 Remove estimated 6"of clay and <br /> Stage 2 2—2.5 years (gravel layer silt; gravel layer estimated at 1 foot to 22 feet <br /> thickness) below surface. <br /> Phase 4 6 months— 1 year NA NA <br /> (Reclamation) <br /> The depths and thicknesses are estimated and based upon the nearest exploratory boring logs included in Attachment C. <br /> 29 <br />