|
4.9)
are precipitation-weighted means caculated
from preliminary laboratory results provided by the
NADP/NTN Central Analytical Laboratory at the
Illinois State Water Survey and are subject to
change. The 190 points
()
shown on this map represent all sites which were in operation during
the reporting period.A notation of D instead of a
pH value at a site indicates that there was no precipitation;
a notation of M indicates that data for the site
did not meet preliminary screening criteria for this
provisional report.A list of the approximately 190 sites comprising the total Network and additional data for the sites are available from the NADP/NTN Coordination Office, Illinois State Water Survey, 2204 Griffith Drive, Champaign, IL 61880.
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