The following list explains fields used in the DBF file.

STATION ID        USGS gaging station ID number
STATION NAME      USGS gaging station name
START DATE        Month/day/year sampling began
START TIME        Hour:minute sampling began
END DATE          Month/day/year sampling ended
END TIME          Hour:minute sampling ended 
SAMPLE Type       1 = spike,  3 = reference,  5 = duplicate, 7 = replicate, 9 = regular, A = not determined, H = Composite (time)    
PARAMETER CODE    Listed after the last line of data at end of this file
VALUE             Data value
PRECISION         Number of significant figures the USGS considers precise ("precision" of any value shold not be construed as its "accuracy")

REMARK           
                    0   Estimate value (E)
                    1   Actual value is known to be less than the value shown (<)
                    2   Actual value is known to be greater than the value shown (>)
                    3   Prsence of material verified but not quantified (M)
                    4   Presumtive evidence of presence of material (N)
                    ?   Invalid remark code
                    &   Biological organism estimated as dominant
                    B   Results based on colony count outside the acceptable range (Non-ideal colony count) (K)
                    L   Biological organism count less than 0.5% (maybe only observed)
                    D   Biological organism count equal to or greater than 15% (dominant)
                    U   Material specifically analyzed for but not detected (ND)
QA CODE           Quality assurance code  
                    1   Non-USGS Lab value - approved for transfer to EPA STORET
                    2   Non-USGS Field value - approved for transfer to EPA STORET
                    3   USGS Lab value - approved for transfer to EPA STORET
                    4   USGS Field value - approved for transfer to EPA STORET
                    6   Non-USGS Lab value - proprietary (written permission)
                    7   Non-USGS Field value - proprietary (written permission)
                    8   USGS Lab value - proprietary (written permission)
                    9   USGS Field value - proprietary (written permission)
                    A   Not reported
                    B   Non-USGS Lab value - failed edit
                    C   Non-USGS Field value - failed edit
                    D   USGS Lab value - failed edit
                    E   USGS Field value - failed edit
                    F   Non-USGS Lab value - in review
                    G   Non-USGS Field value - in review
                    H   USGS Lab value - in review
                    I   USGS Field value - in review
METHOD            NOT USED.  PLEASE DISREGARD
