Sulfates in Indiana substrates.

Details

• Creators:
  Branam, Tracy ; Green, Robin ; Wittman, Oliver ; Ayre, Anne
• Corporate Creators:
  Purdue University. Joint Transportation Research Program
• Corporate Contributors:
  Indiana Department of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Chemical Tests Conductivity Screening Groundwater Sulfate Indiana Maps Soil Mapping Soil Sulfate Soil Tests Sulfates Sulfate Test Methods
• Publication/ Report Number:
  FHWA/IN/JTRP-2016/19
• Resource Type:
  Tech Report
• Geographical Coverage:
  Indiana
• Corporate Publisher:
  Purdue University. Joint Transportation Research Program
• Abstract:
  This study was undertaken to develop modifications for improving cost and time efficiencies without sacrificing accuracy and precision to
  
  the current method employed by the Indiana Department of Transportation (INDOT) for determining sulfate content in soils. In addition,
  
  GIS maps of Indiana were prepared for displaying the distribution of sulfate concentration in soils and shallow groundwater to provide
  
  guidance where high sulfate areas might exist and to show where gaps occur in available data.
  
  The IGS study confirmed that the current INDOT test method using 1:20 soil/water ratio and turbidimetric method for analyzing sulfate
  
  are optimal. A conductivity screening test on soil leachate eliminated the need to run a turbidity sulfate test for most samples, reducing
  
  the time necessary for filtering, and the cost of materials for running the test. Of the 11 samples in this study, 73% had conductivity
  
  readings corresponding to <3,000 ppm soil sulfate action threshold. A lower threshold of 1,000 ppm eliminated close to 60% of samples
  
  from sulfate determination. A much larger soil sulfate data set obtained from INDOT indicate sulfate analyses could be reduced by 50%
  
  to over 75%, depending on the threshold value.
  
  Contour maps of the distribution of sulfate in soils and groundwater were prepared with data from multiple agencies. Gaps in the data
  
  sets limit the usefulness of the current maps. In places of good data density, areas of minimal sulfate are distinguished from areas with
  
  elevated sulfate content, indicating how a more completed data set would be valuable as a guide to problem areas throughout the state.
  
  Some areas of elevated groundwater sulfate coincided with elevated soil sulfate, suggesting a correlation. However, the areal
  
  distribution gaps in both data sets prevent a more definitive interpretation.
  
  
• Format:
  PDF
• Funding:
  SPR-3728
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:32411dafe63c2c807fafaa6410f7d7f14ab2d8bb3b7665a9de07e51fd1d4b2b0
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31630/dot_31630_DS1.pdf
• File Type:
  [PDF - 20.88 MB ]