Skagit.NH3_N.df:
Ammonia Nitrogen Concentrations in the Skagit River, Marblemount, Washington
Description
Ammonia nitrogen (NH$_3$---N) concentration (mg/L) in the Skagit River
measured monthly from January 1978 through December 2010 at the
Marblemount, Washington monitoring station.
Format
A data frame with 396 observations on the following 6 variables.
Date- Date of collection.
NH3_N.Orig.mg.per.L- a character vector of the ammonia
nitrogen concentrations where values for non-detects are preceeded
with the less-than sign (<).< dd="">
NH3_N.mg.per.L- a numeric vector of ammonia nitrogen
concentrations; non-detects have been coded to their detection limit.
DQ1- factor of data qualifier values.
-
U = The analyte was not detected at or above the reported result.
-
J = The analyte was positively identified. The associated numerical result is an estimate.
-
UJ = The analyte was not detected at or above the reported estimated result.
DQ2- factor of data qualifier values.
An asterisk (
*) indicates a possible quality problem for the result. Censored- a logical vector indicating which observations are censored.
Details
Station 04A100 - Skagit R \@ Marblemount.
Located at the bridge on the Casdace River Road where
Highway 20 (North Cascades Highway) turns 90 degrees in Marblemount.