Climate Resilience Dashboard
EIP Project Tracker
Lake Clarity Tracker
Monitoring Dashboard
Parcel Tracker
Threshold Dashboard
Transportation Tracker
Overview
Basics
Basics
Lake Tahoe Source Attribution Study (LTSAS) to determine the sources of observed PM in the Lake Tahoe Basin; including analyze the Lake Tahoe Atmospheric Deposition Study (LTADS) and Desert Research Institute (DRI) data to distinguish sub-sets of site and seasonal data to assess seasonal trends, use multivariate statistical procedures to identify factors and groups of chemical species of relevance within the measured data set, compile a set of chemical source profiles applicable to the receptor modeling of the LTADS ambient results and apply the CMB receptor model to the LTADS data to determine the sources of the observed PM.
Completed
2007
2007
2009
$96,249
Alan Heyvaert (alan.heyvaert@dri.edu)
09/20/2017
09/20/2017
|
To zoom, hold down the Shift key and drag a rectangle.
|
|
| Location Information | Location Notes |
|---|---|
Organizations
EIP Details
EIP Basics
EIP Basics
04.01.01.0043 - P013: Receptor Modeling Study to Determine the Sources of Observed Ambient Particulate Matter in the Lake 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
Reported Expenditures
Reported Expenditures
| Total | 2009 | 2008 | 2007 | |
|---|---|---|---|---|
| Southern Nevada Public Land Management Act (Pacifi... | $96,249 | $32,083 | $32,083 | $32,083 |
| Grand Total | $96,249 | $32,083 | $32,083 | $32,083 |
Photos
Other Details
Watersheds
No watersheds set for this project.
Threshold Categories
-
Knowledge of the sources contributing to the observed PM is crucial in order to develop an approach to reduce the impact of atmospheric deposition on water quality in the lake.
-
Knowledge of the sources contributing to the observed PM is crucial in order to develop an approach to reduce the impact of atmospheric deposition on water quality in 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
| 07/08/2017 7:51 AM | System | Objectives: To identify and model the sources of observed PM in the Lake Tahoe Basin. This is critical if basin management agencies are to develop effective strategies to reduce the ambient concentrations of PM, and subsequently deposition to the lake. • Analyze and graphically represent the Lake Tahoe Atmospheric Deposition Study (LTADS) two-weekly and MiniVol ambient data sets, to identify outliers, and to distinguish site and seasonal data sub-sets. • Apply multivariate statistical procedures, including Principal Components Analysis (PCA) and Positive Matrix Factorization (PMF) to identify factors and chemical species of relevance within the measured data set. • From the Desert Research Institute’s Lake Tahoe Source Characterization Study and other source profile data, compile a set of chemical source profiles applicable to the receptor modeling of the LTADS ambient results. • Apply the Chemical Mass Balance (CMB) receptor model to the LTADS ambient together with the above compiled source data, to assess the source contributions to the observed PM samples. |
||
| 07/08/2017 7:50 AM | System | Findings: Hypothesis: Re-suspended paved road dust is the major source of PM10 in the basin. The results supported this hypothesis. This is best seen at the two high traffic sampling sites in the densely populated area of South Lake Tahoe, the one being the South Lake Tahoe site (45% of PM10), 30 meters to the north of Highway 50 and approximately 100 m from the lake shore, and Sandy Way (36% of PM10), 40 meters south of Highway 50 and approximately 200 meters from the IMPROVE site. The third site where road dust is predominant is at Lake Forest (61% of PM10), about 3 km northeast of Tahoe City, and about 20 meters south of Highway 28. The Thunderbird Lodge site on the east shore is not in a residential area and at least 650 meters west from the Highway 28, with only background levels of road (geological) dust. PMF was able to distinguish two types of fugitive dust, one low in Ca with a Fe/Ca ratio of approximately 2, and a second with high Ca and Mg values and a Fe/Ca value of approximately 0.23. Hypothesis: Wood burning is an important source of PM2.5 during the winter months. The results supported this hypothesis. Both the PMF and CMB demonstrated that residential wood combustion with possible contributions from wildfires and controlled burns are the major PM2.5 sources of pollution during the fall and winter months. For example, CMB results indicated the two south shore sites of Sandy Way (67% of PM2.5) and South Lake Tahoe (51% of PM2.5) were dominated by emissions from this source. Smaller amounts of wood burning were also modeled at the out-of-basin site at Big Hill. Lake Forest and Thunderbird Lodge modeled lower concentrations of wood burning. Hypothesis: Motor vehicle tailpipe emissions is the major source of PM2.5 in the basin. The results did not support this hypothesis. For example, the CMB showed gasoline and to a lesser extent diesel vehicle emissions as major contributors to PM2.5 at Sandy Way and South Lake Tahoe, both sites being close to the high traffic Highway 50 and in the residential and commercial areas of South Lake Tahoe. As a percentage of PM2.5 mass the value varies little, amongst Lake Forest (33%), Sandy Way (26%), South Lake Tahoe (29%) and Thunderbird Lodge (23%). *** See www.fs.fed.us/PSW/partnerships/tahoescience for additional findings |