Record Details
page 3.3-13
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page 3.3-13 Finding of No Significant Impact Lake Fork Section 203 Alternative : Proposed Action, page 3.3-13 |
| Coverage | Electronic reproduction; |
| Format | 3.3-13 text/PDF |
| Rights | Brigham Young University; http://lib.byu.edu/about/copyright/generic.php Public Domain Public |
| Language | English; eng; en |
| Relation | Central Utah Project; Western Waters Digital Library; organochlorine Organo chlorine analyses for sediment and biological samples were eliminatedfrom eliminated from further study because study results indicated that these contaminants were not accumulating at significant levels in project area fish populations 334.2 3342 3342 proposed action lake fork section 203 this section identifies and summarizes the operational impacts on surface water quality and environmental contaminants the primary location for water quality and contaminant trace element assessment was the lower lake fork river near myton just upstream from its confluence with the duchesne river an understanding of the concept of stream constituent loading is essential to an evaluation of surface water quality impacts constituent loads are estimated by multiplying constituent concentrations by streamnow streamflow stream now flow thus changes in load are influenced by changes in either concentration flow or both under the proposed action lower lake fork river TDS concentrations are projected to increase in combination with a relatively greater decrease in project area outflow the net result is a decrease in total salt load associated with an increase in concentration 3342.1 33421 33421 potential operational impacts on surface water quality changes in surface water quality were estimated based on current agricultural return flow quality river quality and relationships among river flow EC and TDS TDS was the key water quality constituent evaluated because of a clear trend toward increasing trace element concentrations with increasing TDS concentrations in surface waters and because of the high level of concern for salinity TDS loads in the colorado river system under the proposed action the mass balance analysis which combines agricultural return flows with lower river flows shows that mean annual TDS concentrations in the lower lake fork river would increase by 12 percent 71 mgl egl average annual flows leaving the unit i outflow would be reduced by 12 percent 3300 ac ft and the annual salt load in the lower lake fork river would decrease by 4 percent 900 tons compared to baseline conditions see table 3.36 336 33 336 6 with a reduced salt load 900 tons per year leaving the project area the salt load is expected to decrease oi ol 0.1 01 percent in the colorado river at imperial dam TABLE 3.36 336 33 336 6 flow and salinity impacts on the colorado river for the proposed action TDS salt mass flow concentration load 1000 ac ftyr ftlyr fayr change egl mgl change 1000 1000tonsyr tonslyr tonsler change colorado river rivera 7271 NA 834 NA 8253 NA lake fork river near myton baseline 27.2 272 272 NA 584 NA 22.1 221 NA proposed action 23.9 239 239 NA 655 NA 21.2 212 NA 3313 33 13 |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/11979 |
