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t <br />' GIOSSBry <br />' ABANDONMENT. Abandonment is <br />plugging a well, removal of installations, <br /> and termination of operations for production <br />' from a well. <br /> ACRE-FEET. The amount of water it <br /> would take to cover an acre of land to a <br /> depth of 1 foot. One acre-foot equals <br /> 325,851 gallons. <br /> AIR QUALITY CLASSES. Classifications <br /> established under the Prevention of <br /> Significant Deterioration portion of the <br /> Clean Air Act which limits the amount of air <br /> pollution considered significant within an <br /> area. Class I applies to azeas where almost <br /> any change in air quality would be <br /> significant; Class II applies to azeas where <br />' the deterioration normally accompanying <br /> moderate well-controlled growth would be <br /> permitted; and Class III applies to azeas <br />where industrial deterioration would <br /> generally be allowed. <br />ALLUVIAL SOIL. A soil developing from <br />recently deposited alluvium and exhibiting <br />essentially no horizon development or <br />modification of the recently deposited <br />materials. <br />ALLUVIUM. Clay, silt, sand, gravel, or <br />other rock materials transported by flowing <br />water. Deposited in compazatively recent <br />geologic time as sorted or semi-sorted <br />sediment in riverbeds, estuaries, floodplains, <br />lakes and shores, and in fans at the base of <br />mountain slopes. <br />ANIMAL UNIT MONTH (AUM). The <br />amount of forage necessary to sustain one <br />cow and one calf or its equivalent for one <br />month. <br /> <br />ANTICLINE. A fold, generally upwazdly <br />convex, with a core containing <br />stratigraphically older rocks. <br />AQUIFER. A formation, groups of <br />formations, or part of a formation that <br />contains sufficient saturated permeable <br />material to yield economic quantities of <br />water to wells and springs. <br />AREA OF CRITICAL <br />ENVIRONMENTAL CONCERN (ACEC). <br />An azea established through the planning <br />process as provided in FLPMA where <br />special management attention is required <br />(when such azeas are developed or used or <br />where no development is required) to protect <br />and prevent irrepazable damage to important <br />historic, cultural, or scenic values; or to fish <br />and wildlife resources or other natural <br />systems or processes; or to protect life and <br />afford safety from natural hazards. <br />BIG GAME. Larger species of wildlife that <br />aze hunted, such as elk, deer, bighorn sheep, <br />and pronghorn antelope. <br />CONTROLLED SURFACE USE (CSU). <br />Use and occupancy is allowed (unless <br />restricted by another stipulation), but <br />identified resource values require special <br />operational constraints that may modify the <br />lease rights. CSU is used for operating <br />guidance, not as a substitute for the No <br />Surface Occupancy (NSO) or Timing <br />stipulations. <br />CULTURAL RESOURCES. Those fragile <br />and non-renewable remains of human <br />activity, occupation, or endeavor reflected in <br />districts, sites, structures, buildings, objects, <br />artifacts, ruins, works of art, azchitectwe, <br />and natural featwes that were of importance <br />in human events. <br />1 <br />