Record Details
page 3.3-18
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page 3.3-18 Finding of No Significant Impact Lake Fork Section 203 Alternative : Proposed Action, page 3.3-18 |
| Coverage | Electronic reproduction; |
| Format | 3.3-18 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; TABLE 3.38 338 33 338 8 flow and salinity impacts on the colorado river for the twin pots section 203 alternative salt mass flow TDS concentration load 1000 1000ac ac ftlyr ftyr fayr change egl mgl change 1000 1000tonsyr tonsyr tonsur ton syr change colorado rivera river 7271 NA 834 NA 8253 NA lake fork river near myton baseline 27.2 272 272 NA 584 NA 22.1 221 NA twin pots section 203 23.9 239 239 NA 630 NA 20.4 204 204 NA change baseline to twin pots 33 3.3 33 12 46 8 1.7 17 8 section 203 colorado river with twin pots 7268 ol oi 0.1 01 836 0.2 02 02 8251 ol oi 0.1 01 section 20313 20 20315 NA not applicable aat aaa t imperial dam 50 year modeled average bnew anew new values based on estimated impact on the colorado river with a reduced salt load 1700 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 water diverted for irrigation and which returns to the river system as runoff or deep percolation has a higher concentration of TDS than water that stays in the river the salinity TDS concentration in water leaving the unit would increase by 8 percent because more of the outflow would be lower quality agricultural return flows salt loads would decline by 8 percent however because less water would be leaving the unit as runoff and irrigation deep percolation the projected increase in the mean TDS concentration to 630 mgl egl would be well below the state water quality criteria for agriculture 1200 mgl egl 3344.2 33442 33442 potential operational impacts on environmental contaminants 33442.1 334421 334421 334921 contaminants in surface waters under the twin pots section 203 alternative mean trace element concentrations for arsenic boron iron manganese and gross alpha radioactivity would increase slightly see table 3.37 337 33 337 7 except for boron none of the mean trace element concentrations projected would exceed established water quality criteria although mean trace element concentrations in the lower lake fork river are projected to increase above baseline conditions changes in the frequency and magnitude of peak maximum concentrations were not modeled and are unknown however the projected 8 percent 46 mgl egl increase in the mean TDS concentration to 630 mgl egl is expected to proportionately increase mean concentrations of all dissolved ionic constituents including selenium consequently the number of agricultural water quality exceedances exceed ances for TDS and boron and trace element contaminant effects in localized areas near the lower lake fork duchesne river are expected to increase water quality impacts would likely be limited to 3318 33 18 |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/12207 |
