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<br /> <br /> <br /> <br /> <br />United States Department of the Interior <br />GEOLOGICAL SURVEY <br />MATER RESOURCES DIVISION <br />Room 1016 Administration 8uildinq <br />1745 West 1700 South <br />Salt Lake City. Utah 84104 <br />July 10, !992 <br />TAKE `? <br />FMN??.` <br />M ? ? <br />00 W <br />Torn Aldrich <br />' Utan Div. of wildlife Resources <br />1596 W. :4orth Temple <br />Salt Lake City, Utah 84116 <br />1 <br /> <br />1 <br />11 <br /> <br />Dear Tom: <br />At long last I have all -e results from the sampling done at Moab <br />Slough in July 1991 (radchem results transmitted to you in May 1991) and <br />have enclosed all data with = is letter. Three sites were sampled:. <br />site 1 near the south end of the slough, site 2 in an impoundment area <br />near site 1, and site 3 near the middle of the slough (see fig. 1). <br />The emphasis was on contaminants common in the area: selenium, uranium, <br />and vanadium. Sediment samples were taken at sites 1 and 2 to a depth <br />of about 8 inches, well mixed and analyzed for a variety of traceland <br />common elements. The sediment was seived in the laboratory to st <br />for the sand-sized fraction (< 2 mm) and the fine clay fraction (<0.06 <br />mm). The clay fraction typically could contain more of the trace <br />elements. <br />Table 1 shows the results of the analyses done on water. There <br />does not appear to be any significant problems with concentrations of <br />the elements analyzed. The sample from site 2 had greater "salinity", <br />and somewhat larger concentration of vanadium than the other sites but <br />not within a hazardous range. Water from this site also contained much <br />more uranium and radioactive particles as I indicated to you in my <br />letter of July 10, 1991. The State alpha standard for wildlife <br />protection (actually for protection of humans consuming wildlife) is-15 <br />pCi/1, so the measured value c4- 18 pCi/L indicates a potential problem. <br />Tables 2-4 show the analytical results for elements in the two <br />samples of bottom sediment. --tere was generally little difference in <br />concentrations between the coarse (<2 mm) and the fine (<0.06 mm) <br />fractions. Concentrations of selenium, vanadium, and zinc in the <br />sediment were not excessive but were slightly greater than what is <br />typically found in soils. Concentrations of elemental uranium in the <br />sediment from both sites was within the normal range for soils in the <br />Uinta Basin. The concentration of uranium at site 2 was larger than at <br />2 <br />site 1 and is sof alpha in water <br />bottom sediment <br />was greater. Concentrations <br />did not appear to be unusually large. - <br />