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C>J C\I 'l:1' -. ,... ,- BUREAU OF RECLAMATION REPORT by the Regional Salinity and Rubidoux Laboratory, United States Depart- ment of A~iculture, the Green River water at the diversion site is of excellent 'luality for irrigation purposes. Return flow water also will be suitable for irrigation since it will have moved laterally through non-saline soil and gravel without having entered the underlying shale. Some biological treatment of culinary water by project farmers would no doubt be re~uired. Water Rights Numerous rights have been established for use of water from the Green Rivel:' and its tributaries above the potential diversion dam. These right s were recognized in determining the flow available for the project. A water right for the Seedskadee project can be obtained under Wyoming State law. Return flows and tributary inflows below the project would satisfy all existing downstream rights. Lands Topography, Soils, and Drainage Lands in the pl:'oject area lie on a series of benches or river terraces that are parallel to either Green River or Big Sandy Creek. The benches slope gently toward the streams and the different benches are separated by steep slopes. Natural drains intersect the benches at fre~uent intervals and discharge into the river or creek. SUrface soils are underlain by 5 to 20 feet of porous river sands and gravels which are in turn underlain by impervious or slightly pervious sand- stone or shale. The impervious layers lie nearly parallel to the sur- face. Thus the deep-percolating water from irrigation is expected to travel through the coarse sands and gravels over the impervious strata and appear in the natural drains and the artificial drains that would be installed as a part of project development. Soils in the area have developed from alluvial material under the influence of a semiarid cli- mate. The soils of the higher benches are calcareous and generally have a lime acc1.Ullulation in the subsoil as a result of redistribution of cal- cium carbonate by water from precipitation. The soils of the lower benches are of more recent alluvial deposition and the lime accumula- tions are not so pronounced as on older and higher benches. Salinity and alkalinity are prOblems only in lower areas which receive soluble salts leached from the higher benches. Most of the bottom lands, how- ever, would be excluded from project development. Land Classification A detailed land classification survey was made to determine irrigable areas, proper land use, size of farm units, and payJDent 8