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763 764 (~) 765 766 767 I I I I I I I I I I I . I I I I I I I I 2,6095 2,609 Selenium c~ncentrations. ug/L for Escalante Ranch Utah Water Quality Standard. 5.0ugjL ~ = spr ings nd = below daleclion imil 2,6085 \ ~~a" .;{ M M ~,' nd ,,--- ~ ~ = Sa flow dir eel ion 2.608 ~N I 1. 000 feet 2.6075 " i 2.607 Terrace I I 2,50651 I Escarpmeni Weiland rd None Detected 2.5061 2.D<:~51 \ 1260 , Very High nd nd nd Dike ike nd Rig 2.6045 760.5 71i1.5 762.5 763.5 , 2_605 ----:... Green River 761 762 764.5 766.5 Figure 16. Selenium Concentrations in the Escalante Wetlands During 1993 (From cooper and Severn 1994b) agricultural drainage waters which leached salts from Mancos Shale and flow in a generally east to west direction in the northern and southern portions of the area. Although selenium did not occur in wetland waters, it is possible that the soils in this area contain selenium in an insoluble form. This possible soil contamination will require further investigation. High concentrations of selenium may present some concerns with regard to the potential of this site for enhancement of razorback sucker habitat. Much attention has recently been placed on the toxic effects of selenium on wildlife. High concentrations of selenium on the study site could potentially impact the reproductive success and larval survival of razorback suckers. A summary of the potential effects of selenium on Green River razorback suckers is found in Appendix 3. This plan presents alternatives for reducing the impacts of selenium and suggests further studies with regard to selenium toxicity. Dissolved oxygen concentrations do not appear to present any concerns at this site. Concentrations ranged from a hi~h of 23.8 26