September 2005 CH2M HILL & Air Sciences Sand Mass Trends at Great Basin CSCs, ‘00-’05 Owens Lake Dust Mitigation Project Owens Lake Dust Mitigation Project Los Angeles Department of Water Los Angeles Department of Water & Power & Power CH2M HILL and Air Sciences CH2M HILL and Air Sciences Bishop, September 28-29 2005 Bishop, September 28-29 2005
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CH2M HILL & Air Sciences September 2005 Sand Mass Trends at Great Basin CSCs, ‘00-’05 Owens Lake Dust Mitigation Project Sand Mass Trends at Great Basin.
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September 2005 CH2M HILL & Air Sciences
Sand Mass Trends at Great Basin CSCs, ‘00-’05Owens Lake Dust Mitigation ProjectOwens Lake Dust Mitigation Project
Sand Mass Trends at Great Basin CSCs, ‘00-’05Owens Lake Dust Mitigation ProjectOwens Lake Dust Mitigation Project
Los Angeles Department of Water & PowerLos Angeles Department of Water & PowerCH2M HILL and Air SciencesCH2M HILL and Air SciencesLos Angeles Department of Water & PowerLos Angeles Department of Water & PowerCH2M HILL and Air SciencesCH2M HILL and Air Sciences
Bishop, September 28-29 2005Bishop, September 28-29 2005
Bishop, September 28-29 2005Bishop, September 28-29 2005
September 2005 CH2M HILL & Air Sciences
Goal of Analysis
• To examine spatial and temporal trends in the District sand mass collections, in light of construction activities on the lake bed
September 2005 CH2M HILL & Air Sciences
Data
• Data provided by District,– Jan 2000-July 2005
• Data summarized by year & month
• CSC locations categorized by location and/or control status
September 2005 CH2M HILL & Air Sciences
Factors Considered
• Meteorology
• Dust Control Measures (DCMs)
• Construction activities
September 2005 CH2M HILL & Air Sciences
Meteorology
• Windspeed
• Precipitation
• Temperature & Relative humidity
September 2005 CH2M HILL & Air Sciences
September 2005 CH2M HILL & Air Sciences
September 2005 CH2M HILL & Air Sciences
September 2005 CH2M HILL & Air Sciences
September 2005 CH2M HILL & Air Sciences
Meteorology: Results
• Wind speed in ’00-’05 similar to long term trend
• Wind speed similar during all construction phases
• Precipitation variable by year• Temperature and relative humidity
similar to long term trend
September 2005 CH2M HILL & Air Sciences
Base
Map
September 2005 CH2M HILL & Air Sciences
Construction Periods
• Pre-construction 1/00-10/00• NSS construction 11/00-12/01• Managed Vegetation 1/02-8/02• Phase 2 shallow flood 9/02-4/03• Interim (no activity) 5/03-8/03• Phase 3 construction 9/03-9/04• Phase 4 shallow flood 10/04-7/05
September 2005 CH2M HILL & Air Sciences
Analysis of Sand Mass Trends
• Two levels of Analysis:1. Trends by CSC category
2. Trends by individual CSCs
September 2005 CH2M HILL & Air Sciences
Sand Mass Trends by Category
• High throughout entire period – Shallow Flood Phase 4 and 5– Keeler Dunes
• High initially, decrease with DCMs– NSS Zone 2– Managed Vegetation– Shallow flood Phase 2
September 2005 CH2M HILL & Air Sciences
September 2005 CH2M HILL & Air Sciences
September 2005 CH2M HILL & Air Sciences
Sand Mass Trends by Category
• High initially, construction increase– NSS Zone 1
• Low initially, construction increase– 2002-2004 SCA
September 2005 CH2M HILL & Air Sciences
September 2005 CH2M HILL & Air Sciences
September 2005 CH2M HILL & Air Sciences
Results by CSC Group
• Analysis indicates increased sand mass over time due to construction activities
• However, trends in sand mass are unique on a CSC by CSC basis
September 2005 CH2M HILL & Air Sciences
Construction Evidence by CSC
• Distance to construction activity
• Timing of construction activity
• Wind speed and precipitation
September 2005 CH2M HILL & Air Sciences
Results
Map
September 2005 CH2M HILL & Air Sciences
September 2005 CH2M HILL & Air Sciences
Results: By individual CSCs
Evidence Category # Cells %
• Unlikely, low sand mass 16 12• Unlikely, high sand mass 39 28• Inconclusive 29 21• Possible evidence 10 7• Strong evidence 44 32