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<br />Selenium in fish ...................................................................................................................................... . <br />Selenium in birds ................................................................................................................................... <49 <br />Mercury..................................................................................................................................................30 <br />Aluminum .............................................................................................................................................. 53 <br />Arsenic ................................................................................................................................................... " <br />Boron ...................................................................................................................................................... 53 <br />Cadmium................................................................................................................................................54- <br />Chromium .............................................................................................................................................. 54- <br />Copper .................................................................................................................................................... 55 <br />Lead ........................................................................................................................................................ 55 <br />Zinc ........................................................................................................................................................ 55 <br />Organochlorine pesticides ................................................................................................................................ 56 <br />Polycyclic aromatic hydrocarbons ................................................................................................................... 56 <br />Summary..............................................................................................................................................................................57 <br />References cited ................................................................................................................................................................... 60 <br />Supplemental data ................................................................................................................................................................. 65 <br /> <br />FIGURES <br /> <br />I. Map showing location of data-collection sites and extent of irrigated areas in the <br />Dolores Project area .................................................................................................................................................. 5 <br />2. Map showing generailocation of the Dolores Project area and location of data-collection sites in Utah ............... 6 <br />3. Schematic diagram showing major streams. tributaries. reservoirs. canals. and movement of water in Ibe <br /> <br />Dolores Project area .................................................................................................................................................. 10 <br />4-13. Graphs showing: <br />4. Daily mean stream discharge for October 1989 through November 1990. average daily mean <br />stream discharge for water YeaIll 1962-89. and dates when water-<(ua1ity samples were collected <br />at stream11ow-gaging station 09379500. San Juan River at Mexican Hat, Utah (site 813)............................ 12 <br />5. Annual mean stream discharge at stream11ow-gaging station 09379500. San Juan River at <br />Mexican Hat, Utah (site 813). wateryeaIlll962-90...................................................................................... 12 <br />6. Daily mean stream discharge for October 1989 through November 1990. average daily mean <br />stream discharge for water YeaIllI952-89. and dates when water-<(ua1ity samples were collected <br />at streamfiow-gaging station 09372000. Mc Elmo Creek near the Colorado-Utah State line <br /> <br />(site ME3)....................................................................................................................................................... 13 <br />7. Water-level measurements for wells OWl. OW2. and OW3. January 1990-0ct0ber 1991.......................... 35 <br />8. Concentrations of selenium in surface-water samples from Mc Elmo Creek. Simon Draw. <br />Hartman Draw. Alkali Canyon. Dawson Draw, and Navajo Wash in 1990................................................... 37 <br />9. Concentrations of selenium in surface-water samples from Yellow Jacket Canyon, Woods Canyon, <br />Cahone Canyon. Cross Canyon. the Mancos River, and the San Juan River in 1990 ................................... 38 <br />10. Geometric mean selenium concentrations in dietary items offish and wildlife ............................................ 45 <br />11. Geometric mean selenium concentrations in whole-body sucker samples collected from streams............... 46 <br />12. Geometric mean selenium concentrations in whole-body sucker samples collected from streams <br />draining the MVIC (Montezuma Va1ley Irrigation Company) area............................................................... 47 <br />13. Geometric mean mercury concentrations in fillet and whole-body fish samples........................................... 51 <br /> <br />TABLES <br /> <br />L Water delivery and irrigated acreage in the Dove Creek area of the Dolores Project, 1987-90 ............................. 14 <br />2. Median and maximum concentrations of trace elements in water samples collected at stream11ow-gaging <br />station 09372000. Mc Elmo Creek near the Colorado-Utah State line (site ME3) ..........................;...................... 17 <br />3. Median and niaximum concentrations of trace elements in water samples collected at stream11ow-gaging <br />stations 09371010. San Juan River at Four Comers (site Sl1), and 09379500, San Juan River at <br /> <br />Mexican Hat. Utah (site SJ3) ................................................................................................................................... 18 <br /> <br />Iv CONTENTS <br />