2021-03-05_REVISION - M1977141 - Laserfiche WebLink

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Lyons Quarry �`` 112d Reclamation Permit Operations ,l/Z Technical Revision Item 6.0— Earthwork Item 6.1 —Excavation and Blasting Once the site controls are installed, the grading plan will be implemented. All areas will be appropriately marked to protect vegetation and structures. The work areas will then be cleared and grubbed prior to excavation and backfilling. Topsoil sources will be stripped and appropriately stockpiled. As described in the Geotechnical Stability Exhibit, Attachment E, cut slopes in the overburden sedimentary rock will be excavated using heavy equipment or drill and blast methods to achieve overall 2H:1V slopes. Excavated material from the Fountain Formation sandstone will be segregated into riprap or fill material onsite with the fill material either being sent to Quarry 2 for backfill or transported down to the swale at the entrance to Quarry 1. The CAT 349 excavator and CAT D9 dozer will perform the majority of excavation with the excavator and wheel loader loading the CAT 740 haul trucks. The riprap rock material will be screened and sized with the largest gradation used for the scour berm at the base of the quarry. Smaller riprap (Type M)will be used for lining the drainage channels. As shown in Table 3 the estimated aggregate excavation volume to establish the final grading for the Quarry 1 area is approximately 245,080 CY. Excavation and fill requirements for the floodplain (Area 2), which are covered in Technical Revision #4, are included for reference. Technical Specifications, including blasting requirements, for Excavation are included in Section 31 23 16 of Attachment G. Table 3 — Estimated Excavate-Fill Quantities ■I'� p I Area 1 —Quarry Slope Grading 245,080 125,300 Catchment Berms 8,250 Sedimentation Pond Fill 2,250 Scour Berm and Drainage Channel Riprap 20,000 Area 2— Floodplain Soil Removal 23,300 13,685 Total Project 268,380 169,485 Excavate-Fill Balance 98,895 Item 6.2— Fill Fill slopes in the Quarry 2 highwall area will be placed and compacted to achieve 50-foot-high benches, sloped 2H:1 V, with 15-foot wide benches. Compaction will be performed with tracked equipment(D9 dozer) a minimum number of passes to achieve specified densities. Including Quarry 2 and catchment and scour berms, the estimated aggregate fill volume to establish the final grading for Area 1 is approximately 155,800 CY. Fill materials will consist of overburden materials that are uniformly graded continuously from boulder size to silt size, with a maximum particle size equal to two-thirds of the lift thickness and maximum 45 percent fines in the minus 3-inch fraction. March 2021 1 16