Metadata for csv dataset,
Pesticide Field-Blank Data From Surface-Water Sites in Historical U.S. Geological Survey Water-Quality Networks, 2002–12	

Column heading followed by description

Station: Sampling station identification number
Date: Date of sample collection
Parameter name: National Water Information System (NWIS) parameter name
Parameter code: NWIS parameter code
Schedule: A code for the National Water Quality Laboratory (NWQL) suite of pesticides.
Remark: A remark from the NWQL for the pesticide concentrations-    
        "<": The measured value is less than the indicated concentration (detection limit)
    
        "E": The reported value is an estimate
Result: Concentration in micrograms per liter
Flag: Indicator for potential data screening:
    
        1. No restrictions on data use
    
        2. Alert to use of this record, include cases where the sample collector requested result verification by NWQL, the field-blank result was higher than the associated environmental result, original data were miscoded, or the sample was diluted
    
        3. Suggest disregard this record for reason explained in comment
Recensor note: Note to describe recensoring from reported censor level (as laboratory reporting level [LRL], method detection limit [MDL], interim reporting level [IRL], or minimum reporting level [MRL]) to the long-term method detection level (LTMDL)
Comment: Description of evidence to support flag