Record Details
page 3.3-14
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page 3.3-14 Finding of No Significant Impact Lake Fork Section 203 Alternative : Proposed Action, page 3.3-14 |
| Coverage | Electronic reproduction; |
| Format | 3.3-14 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 3.36 336 33 336 6 flow and salinity impacts on the colorado river for the proposed action TDS salt mass flow concentration load 1000 1000ac ac ftyr ftlyr fayr change egl mgl change 1000 1000tonsyr tonsyr tonsur ton syr change change baseline to proposed 33 3.3 33 12 71 12 09 og 0.9 09 4 action colorado river with proposed actionb action5 actions 7268 oi ol 0.1 01 836 0.2 02 02 8252 01 oi 0.1 01 NA not applicable aat aaa at imperial dam 50 year modeled average bnew anew new values based on estimated impact on the colorado river 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 under the proposed action the salinity TDS concentration in water leaving the area would increase by 12 percent because more of theoutflow the outflow would be lower quality agricultural return flows rather than higher quality river water salt loads would decline by 4 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 655 mgl egl would be well below the state water quality criteria for agriculture 1200 mcq mgl mgq 3342.2 33422 33422 potential operational impacts on environmental contaminants projected changes in surface water quality were used to estimate changes in environmental contaminant trace element constituent concentrations in the lower lake fork river projected changes in water quality and trace elements from implementing the proposed action were then compared to established water quality standards and numeric criteria to assess probable qualitative impacts on accumulation bioaccumulation bio and risks to fish and wildlife projected water quality changes were extrapolated to biota and compared against established assessment guidelines and effect levels see tables 333 3.33 333334 333334 3333.34 333 33 3 333 334 3.34 334 33 4 and 3.35 335 33 335 5 these assessments of potential toxicity to fish and wildlife provided the basis to evaluate whether beneficial uses relating to fish and wildlife would be impaired 33422.1 334221 334221 contaminants in surface waters trace elements and TDS were analyzed from the water quality samples collected as part of this study the results incorporated a wide range of concentrations of all elements and indicated a clear trend toward increasing trace element concentrations with increasing TDS concentrations statistically significant positive trace element TDS relationships were found for arsenic boron iron manganese and alpha radiation with nonsignificant but positive trends apparent for selenium and zinc cham ch2m hillhorrocks HILL Horrocks 1996a because of these known relationships and because no better or complex models were available all trace element concentrations were assumed to vary positively with TDS for all water quality projections under the proposed action the projected 12 percent increase in the mean TDS concentration in the lower lake fork river is expected to result in a proportionate increase in mean concentrations of all dissolved ionic compounds including selenium mean trace element concentrations for arsenic boron iron manganese and gross alpha radioactivity 3314 33 14 |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/12106 |
