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USGS Site ID: Site identification number permanently assigned to the well by the U.S. Geological   
    Survey and recorded in National Water Information System (NWIS), a national computer  
    database maintained by U.S. Geological Survey. 
  
Well Log ID: Unique identifier combining a four-letter county-code and a well-log number with up   
    to 6 digits, which is assigned to the well when a water well report is filed by the  
    well driller with the Oregon Water Resources Department and recorded in   
    Ground Water Resource Information Distribution (GRID), a statewide computer database  
    maintained by Oregon Water Resources Department.  
  
Sample Depth: The depth to the sample collection, in feet below land surface. 
  
Unit code: The name of aquifer or geologic unit stored by the U.S. Geological   
    Survey in National Water Information System (NWIS), a national computer  
    database maintained by U.S. Geological Survey. 
  
Major and trace elements: Major elements are listed in weight percent concentration and trace elements are listed in parts per million concentration. One percent equals 10,000 parts per million. 
  
--, no data/unknown. 
  
ND, non-detect 
  
NA, not analysed 
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