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<br />Reconna~ssance Investigation of Irrigation Drainage in the San Juan <br />River Area, San Juan County, Northeastern New Mexico <br /> <br />N <br />~ <br />-J <br />--l <br /> <br />This st~dy is a cooperative effort of the USGS, Fish and Wildlife <br />Service; Bureau of Indian Affairs, and Bureau of Reclamation. The <br />objectives are: (11 to determine the concentrations of major ions, <br />trace e~ements, and selected pesticides in water, sediment, and <br />biota in the San Juan area, and (2) to assess the degree that <br />irrigation drainage contributes to these concentrations. <br /> <br />The fin~l report has been written, reviewed, and revised, and is <br />being prepared for Director's approval. Based on the <br />reconna~ssance investigation, the decision was made to proceed with <br />a detailed investigation of selected irrigation projects in the <br />area. ~ work plan for the detailed study will be developed in the <br />fall of 1992 and field work tentatively is scheduled to begin in <br />the spring of 1993. <br /> <br />Reconnaissance Study of the Water Quality of <br />Rivers and Selected Aquifers from near <br />Shiprock, New Mexico <br /> <br />the San Juan and Chaco <br />Farmington to below <br /> <br />This study <br />Reel ama~ion. <br />evaluat$ the <br />San Juan and <br />from oil and <br /> <br />is a cooperative effort of USGS and Bureau of <br />The objective is to provide water-quality data to <br />potential contribution to increased salinity in the <br />Chaco Rivers from natural ground-water discharg~ and <br />gas well installations. <br /> <br />The data report has been compiled and reviewed, and is awaiting <br />Director's approval for publication. <br /> <br />UTAH <br /> <br />Aneth Ground-Water Salinity Study <br /> <br />This s~udy investigates the locally elevated and possibly <br />increasing salinity of the water of the Navajo and other sandstone <br />aquifers in the Aneth area, San Juan County, Utah. Over the last <br />25 years', specific-conductance values for water from selected wells <br />tapping the Navajo and Entrada Sandstones apparently have <br />increased. A field reconnaissance conducted in FY 1989 confirmed <br />salinity increases on the order of 2,000 mg/L in selected wells. <br />Wells 'yielding water with the largest dissolved-solids <br />concentrations are within or adjacent to the perimeter of the <br />Greater'Aneth and Ismay-Flodine Park petroleum fields. <br /> <br />Specific objectives of the study are: (1) To identify conservative <br />and nonconservative inorganic, isotopic, and organic-geochemical <br /> <br />l~ <br /> <br />-, <br />. -" ,~, <br />":c.,_,,J.:-;',_ _, u,_. ~.d;-,~.:i;' ,;4,' '~i:~ <br />