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<br />\ <br /> <br />poorly drained with high exchangeable sodium. 7hey are classi- <br /> <br />fied as the Hooper-Corlett association. Soil pH ranges from <br /> <br />8.5 to 10.5 and organic matter content is low. <br /> <br />Erosion caused by runoff is minimized due to the well drained <br /> <br />sand dunes and upland areas. Concentrations or water with high <br /> <br />velocities do not occur and movement between low areas seldom <br /> <br />occurs. <br /> <br />The entire area is underlain with ground water at various depths, <br /> <br />the uppermost orten within a foot of t~e surrace in lower basins. <br /> <br />The area is also underlain with impervious clay layers at var- <br /> <br />ious depths, the uppermost sometimes on the surrace. Layers <br /> <br />o. <br /> <br />of impervious blue clay at about 100' depth and below create <br /> <br />) <br /> <br />artesian pressure in the deeper aquifers. Fifteen wells have <br /> <br />tapped the artesian aquifer to provide the existing water <br /> <br />supply for waterfowl habitat development. Approximately 470 <br /> <br />acres of dry land have been converted to wetlands (marsh, pond <br /> <br />or we t meadows). <br /> <br />b. Vegetation. Greasewood (Sarcobatus vermiculatus), rubber <br /> <br />rabbitbrush (Chrysothamntis nauseosus), and four-wing saltbrush <br /> <br />(Atriplex canescens) are the major shrubs which comprise the <br /> <br />general aspect of the area. The understory generally consists <br /> <br />of salt grass (Distichlis stricta), western wheatgrass (Agro- <br /> <br />, <br />_.J <br /> <br />pyron smithii), sandhill muhly (Muhlenbergia Dungens), alkali <br /> <br /> <br />sacaton (SDorobolus airoides), Indian ricegrass (Oryzopsis <br /> <br /> <br />hymenoides), blue grama (Bouteloua gracilis), fringed sage <br /> <br />-5- <br /> <br />'''0 ': c) t'-; -; .f') <br />tJL,-/.l':' <br /> <br />10098 <br />