Read Me File For Plate IV and Associated GIS Layers*:
Modified Airborne Radiometric Map of Popenoe (1964), U.S. Geological
(This read me file written by: Jonathan
Kim, Vermont Geological Survey, August 2002)
700+cps.dbf, 700+cps.shp, 700+cps.shx
500-700cps.dbf, 500-700cps.shp, 500-700cps.shx
100-300cps.dbf, 100-300cps.shp, 100-300cps.shx
300-500cps.dbf, 300-500cps.shp, 300-500cps.shx
unsurveyed.dbf, unsurveyed.shp, unsurveyed.shx
The 5 data layers
listed above were derived from the U.S.G.S. Aeroradioactivity Map of
Popenoe (1964). The divisions (in counts per second (cps)) used correspond
to those delineated by Popenoe (1964) in the text of the map and do
not correspond directly to the divisions contoured on the map (100-300cps=exceptionally
low; 300-500cps=medium low; ~500-700 medium high; 700+cps=high). If
any part of the range of counts per second for a polygon on the map
fell within the divisions described above, then the polygon was assigned
to this division. The unsurveyed.shp coverage shows the areas that were
not surveyed by the Popenoe (1964) investigation. This data was scanned
from the 1:250,000 scale Popenoe (1964) paper map in the Vermont Geological
Survey archives. The data was scanned into a tiff file using a Titan
Scanner and Truinfo software, georectified using ERDAS Imagine, and
digitized in Arcview 3.2a.
In order to make
the data layers display correctly using GIS software, the above order
of layers must be used.
Geodetic Information NAD 83 Vermont Stateplane coordinates (Zone
5526) in meters
Popenoe, P., 1964, Aeroradioactivity of parts of east-central New
York and west-Central New England, U.S. Geological Survey Geophysical
Investigations Map GP-358, scale- 1:250,000.
This coverage was digitized from original 1:250,000 scale maps and
data and, therefore, use at this scale is recommended. Accuracy may
diminish when enlarged beyond this scale.
The only way to determine with certainty if groundwater from a particular
well has elevated radionuclide levels is to have the water tested by
a certified lab. The Vermont Department of Health recommends that all
private well owners test their wells for naturally-occurring alpha radiation
every 5 years http://healthvermont.gov/enviro/ph_lab/water_test.aspx#two.
This map should not be used as a replacement for detailed, site-specific
studies by competent technical personnel.
This map (and the other eight maps in this series) displays geological
and geophysical data compiled from surveys conducted at various times
over several decades. The information used in preparing the map(s) represents
the best data possessed by the Vermont Agency of Natural Resources at
the time of production. The data is subject to revision at any time
and the map user should contact the Vermont Agency of Natural Resources
to determine whether there have been any changes in the data on which
the map was based.
Although every effort has been made to faithfully portray the information
from the surveys, the Agency of Natural Resources cannot vouch for the
accuracy of the data on which the map(s) was based. No warranty as to
the accuracy or the usefulness of the data on the map(s) is expressed
*GIS Data available from Vermont Geological Survey, 103 South Main
Street, Waterbury, Vermont 05671, 802/241-3608, firstname.lastname@example.org