Interpreting and Using Existing Data to Identify Pollution Causes and Sources
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Transcript of Interpreting and Using Existing Data to Identify Pollution Causes and Sources
Interpreting and Using Existing Data to Identify
Pollution Causes and Sources
Confirm impairments and identify pollutants
Compare available monitoring data to wqs:• Document magnitude of impairment• Document seasonal/temporal patterns• Document spatial distribution
Spatial Analysis
• Isolate critical subwatersheds• Combine with land use/land cover data
Flow Relationships
• Point vs. Nonpoint
Flow Relationships
• Point vs. Nonpoint
Temporal Analysis
• Seasonality• Stratify data by potential source activities
– Tillage– Crop canopy development– Manure/fertilizer applications– Grazing season– Logging– Construction projects– Street cleaning
Other tools:
• Stakeholder knowledge• Direct observation (streamwalk)• Specialized tools, e.g., microbial source
tracking, ground water aging
Supplementing available data
– Windshield surveys– Interviews with residents– Volunteer monitoring– Bioassessment– Targeted sampling– Chemical/biological sampling
Helps lay the groundwork for implementation!
Examples
St. Albans Bay VT RCWP
• Known WQ impairment due to eutrophication– Obvious algae blooms & macrophyte growth– Declining State Park visits, beach closures– State DEC P monitoring
• Excessive P loads to Bay• 75% point source/25% nps
• NRCS knowledge about current status of animal waste management, milkhouse waste, cropland erosion
St. Albans Bay VT RCWP
Lake Pittsfield IL• Lake Pittsfield is a 220 ac
lake located near the city of Pittsfield in the 25,393 ac Blue Creek watershed in Pike County, western Illinois
• Constructed in 1961 as a flood control reservoir.
• Sediment deposition the dominant water quality problem
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Lake Pittsfield IL
• 1979 vegetative practices on agricultural land slowed sedimentation rate
• Lake sedimentation still higher than desired• Additional practices needed – WASCOBs and
sediment retention basins
Lake Pittsfield IL
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VT 319 NMP
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19-Aug-9616-Dec-96
31-Mar-9702-Jul-97
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VT 319 NMP
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Lake Champlain Basin Ag Watersheds NMP Project
VT 319 NMP
VT 319 NMP
Identification of stressors
• Where causes of biological impairment are unknown, use characterization data to help identify stressors
Stressor Identification
Stressor Identification
Resources:• USEPA Stressor Identification Guidance Document
www.epa.gov/waterscience/biocriteria/stressors/stressors.html
• USEPA Causal Analysis/Diagnosis Decision Information System (CADDIS) http://cfpub.epa.gov/caddis/home.cfm