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is approximately 70 feet from the river. Terrace overburden ranges <br />from 0 to 24 inches. The site is outside of the 100-year floodplain <br />as mapped March 21, 1980 for the National Flood Insurance Program <br />(panel 211 of 500). <br />Operating Methods <br />Because most of the terrace deposit to be mined is above the ground- <br />water level, most of the mining can be done dry. Topsoil will be <br />stripped and stockpiled adjacent to its site of re-application <br />for use in reclamation (see Excavation Flan map). Exact volume <br />of topsoil stripped is not available. (Adequate topsoil for reclama- <br />tion will be available. See "TOpsoiling" in Reclamation Report.) <br />If topsoil will remain stockpiled for more than one year, stockpile <br />will be seeded with winter rye. The gravel deposit will be mined <br />to a depth of 30 to 60 feet depending on the location. Additional <br />sand and gravel strata underlie that to be mined. In Area A, mining <br />will produce an unmined face sloped at 2:1 and approximately 50 feet <br />high at the north of the area. To the south and below this embank- <br />ment the land will be excavated to create a lake. Lake banks will <br />be graded to 3:1 slopes from 5 feet above to 10 feet belo~•~ expected <br />water surface in accordance with Mined Land Reclamation Board standards. <br />In Area B, mining will produce a 3:1 north slope; this slope will <br />be approximately 40 feet high (with variations due to existing <br />topography). Land below the embankment will be graded to produce <br />an optimum irrigation system; .58 slopes will be created. <br />Front end loaders will excavate the dry material. A backhoe will <br />be used in Area A during excavation of the lake. Excavation will <br />D-2 <br />