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Lyons Quarry ��� <br /> 112d Reclamation Permit Operations <br /> Technical Revision <br /> This item includes construction and maintenance of an upland diversion berm/ditch above and <br /> around the Quarry Excavation Area as shown on Section C of the Site Grading Plan, Attachment A. <br /> Approximately three thousand five-hundred linear feet (3500 LF) of berm/ditch will be required. The <br /> berm/ditch footprint shall be cleared and grubbed. The berm/ditch shall be cut and filled using native <br /> soils on the slope above the quarry and supplemented with materials from the borrow areas. Some <br /> drill and blasting may be required. <br /> The berm/ditch will be lined with minimum six (6) ounce per square yard nonwoven needle punched <br /> geotextile extending from the crest of the berm to four feet (4 ft.) above the invert of the ditch <br /> opposite the berm. Geotextile will be installed in accordance with manufacturer guidelines with <br /> particular attention to anchoring and overlap requirements. <br /> The geotextile liner will be completely covered by riprap placed carefully to prevent damage to the <br /> geotextile. Riprap will consist of well graded, non-mineralized, durable rock with a D50 = 1 foot. We <br /> anticipate that sufficient riprap can be generated from the massive sandstones onsite and will be <br /> selectively blasted and screened as needed to produce specified grading. <br /> Item 4.0— Debris Removal <br /> This item includes removal of debris collected from across the site following the recent flooding. The <br /> debris was gathered and stockpiled at the site out of the drainage way. It is assumed that 25 loads <br /> of debris material will be hauled from the site. <br /> Item 6.0 — Earthwork Excavation, Fill, and Compaction <br /> Once the site controls are installed, the grading plan will be implemented. All areas will be cleared <br /> and grubbed prior to excavation and backfilling. As described in the Geotechnical Stability Exhibit, <br /> Attachment E, cut slopes in the overburden sedimentary rock will be excavated using drill and blast <br /> methods at 1.5H:1V slopes. Fill slopes will be placed and compacted at 2H:1V slopes. The <br /> anticipated cut/fill quantities are approximately balanced at 364,700 CY. <br /> Fill materials will consist of overburden materials that are uniformly graded continuously from <br /> boulder size to silt size, with a maximum particle size equal to two-thirds of the lift thickness and <br /> maximum 45 percent fines in the minus 3-inch fraction. Benches will be constructed 15-foot-wide at <br /> 50-foot contour intervals and will be sloped from west to east at grades not steeper than 10:1. The <br /> bench width was adjusted to achieve an overall 150-foot-high slope with a factor of safety greater <br /> than 1.5. All fill will be placed as follows: <br /> • Placed in horizontal lifts not to exceed 2 feet thick <br /> • Compacted to achieve greater than 90% of the maximum dry density in accordance with <br /> ASTM D698 <br /> • Placed in a manner that allows for a moisture content within 3% of optimum based on ASTM <br /> D698 <br /> Final Grading of all fill slopes, benches, crest areas, and toe areas will ensure that water is not <br /> allowed to pond on or adjacent to the fill slopes. <br /> Item 5.0— Fill Slope Scour Protection <br /> The toe areas of fill slopes that extend into the low-lying areas and the flood way of South St. Wain <br /> Creek will be protected from scour by future flood events by the construction of a riprap scour berm <br /> as shown in Section B of the Site Grading Plan, Attachment A. This scour berm will also allow minor <br /> June 2016 1 6 <br />