The Environmental Monitoring Database (EMD) contains both grab (single) samples
and results from automated data loggers. These results must be queried for
separately. Querying both types of data is recommended to obtain as much
monitoring data as possible for the area, time frame etc. of interest.
A "Grab Sample" is one sample from any given sampling station, not collected as
part of a continuous record of timed samples. An example would be a single
sample collected from a sampling station during a two-week period.
"Time Series Results from Automated Data Loggers" is a set of results from
instruments programmed to record measurements at specific time intervals over a
given period of time. An example would be measurements taken automatically
every 15 minutes during a two-week period.