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Overview
Basics
Basics
This study will use chemical fingerprinting to identify and map sources of fine sediment from highways and roads that is entering and has historically entered Lake Tahoe through stormwater runoff and streams.
Completed
2007
2008
2012
$198,359
Alan Heyvaert (alan.heyvaert@dri.edu)
09/25/2017
09/25/2017
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| Location Information | Location Notes |
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Organizations
EIP Details
EIP Basics
EIP Basics
04.01.01.0063 - P026: Sources of Highway Runoff Fine Suspended Particulates in Stormwater and Streams of the Tahoe Basin.
Performance Measures
Expected Performance Measures
Expected Performance Measures
No expected performance measures set for this project.
Reported Performance Measures
Reported Performance Measures
No annual performance measure accomplishments entered for this project.
Funding
Expected Funding
Expected Funding
$198,359
$198,359
$0
| Total | |||
|---|---|---|---|
| Unknown or Unassigned | $198,359 | $198,359 | $0 |
| Grand Total | $198,359 | $198,359 | $0 |
Reported Expenditures
Reported Expenditures
| Total | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | |
|---|---|---|---|---|---|---|---|
| Southern Nevada Public Land Management Act (Pacifi... | $198,359 | $33,060 | $33,060 | $33,060 | $33,060 | $33,060 | $33,059 |
| Grand Total | $198,359 | $33,060 | $33,060 | $33,060 | $33,060 | $33,060 | $33,059 |
Photos
Other Details
Watersheds
No watersheds set for this project.
Threshold Categories
-
Fine sediments (<20 microns) in Lake Tahoe are responsible for >50 % of the average one foot per year decline in Lake Tahoe clarity over the last four decades. If the sources of these fine sediments can be identified, then steps can be taken to keep these particles from entering the lake.
Local and Regional Plans
No Local and Regional Plans set for this project.
Related Projects
Related Projects
No Related Projects set for this project.
External Links
Notes
Notes
| 08/18/2017 6:41 AM | System | Match Funding: $ 79,782 | ||
| 08/18/2017 6:40 AM | System | Objectives: The goal of this study was to determine whether chemical analyses of suspended fine sediments in road and highway runoff at Lake Tahoe could produce relative signatures of Fine Suspended Particulate (FSP) source type. An approach for fingerprinting highway sediment sources, Sources of Highway Runoff Fine Sediment – September 2012, was successfully applied in Japan, and similar approaches have been used in other studies. Therefore, this study examined the element composition of particles from various sources and locations in the Tahoe Basin to assess the potential for FSP source fingerprinting. |
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| 08/18/2017 6:40 AM | System | Findings: • Distinct chemical differences were evident between source samples, so hierarchical cluster analysis was used to further separate the source samples into a few distinct self-similar groups. Based on this analysis two broad groups of abrasives could be distinguished, one representing the volcanic cinder origin of materials used by both Eldorado County and the City of South Lake Tahoe, while the other group was composed primarily of granitic sands common to the area. • The rock samples were generally different from the other source materials, including regionally derived abrasives. • Analysis of selected samples by scanning electron microscopy showed considerable numbers of very small (<8 µm) mineral particles generally dominating the runoff sample particle size distribution. • The discriminant analysis between source materials performed well, using a mix of elements statistically selected as representing significantly different compositions across sources. |
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| 08/18/2017 6:39 AM | System | Management Implications: • Despite a robust statistical separation by discriminant analysis, the source samples are quite similar and the discrimination is based upon very small differences in relative element composition. This fact, in conjunction with a broader range of element concentrations naturally represented in the highway runoff samples, means that there is too much overlap inherent to the test samples in their source sample attributions. • Alternative normalization schemes are being evaluated for the purpose of reducing noise in the data set and to improve the results of mixing models applied for resolving relative source attributions. The authors are confident that progress in this area will soon yield reliable data on relative contributions from the main sources evaluated in this study, despite very similar compositions resulting from a common geologic origin. |
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| 08/18/2017 6:39 AM | System | Publications: www.fs.fed.us/PSW/partnerships/tahoescience Sources of Highway Runoff Fine Suspended Particulates in Stormwater and Streams of the Tahoe Basin, Alan C. Heyvaert, James M. Thomas, John E. Reuter, Tim Minor and Charles Morton |