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<br /> <br />DL. Distrubed Land <br />• <br />This unit represents the area which is currently (December 1981) disturbed <br />by sand and gravel mining operations. Surface soil has been removed and <br />many remnant sand and gravel piles remain. Numerous wet spot areas exist <br />within this unit. <br />All suitable topsoil has been salvaged from this map unit. <br />This map unit currently occupies 6.5 percent (6.1 acres) of the permit area <br />and 8.7 percent (6.0 acres) of the proposed disturbance area. <br />The topsoil salvage depths discussed in the text and shown on Exhibit I-I are <br />based upon suitability criteria listed in Table I-4. Each soil type was evalu- <br />ated by soil horizon using these criteria. This suitability evaluation is listed <br />in Table I-5. All highly suitable (fair and good quality) topsoil will be sal- <br />vaged from the Mesa sand and gravel tract. <br />• Summer and fall topsoil salvage and replacement is recommended and pre- <br />ferred to winter and spring operations. The soil profiles contain 18 to 40 <br />percent clay in zones which will be salvaged. To minimize excess compac- <br />tion and clodding of seedbed soil, topsoil salvage and replacement will be <br />done when these soils are driest to preserve and maintain their physical <br />characteristics. <br />A total of 131.7 acre-feet of topsoil will be salvaged from the Mesa sand and <br />gravel tract. Approximately 6.3 acre-feet of topsoil are currently stock- <br />piled. A uniform depth of topsoil replacement over the disturbance area <br />(69.1 acres) is proposed. Therefore, 2.0 feet of topsoil will be replaced. <br />• <br />I-12 <br />