John 
My main comments were in what i sent to you and to Bernardin Lockwood
Mueller in Evansville.  I will just reiterate that there is far more karst
than has been shown thus far and that unforseen high construction costs
will result if construction is allowed.  Ground water
flow will certainly be altered and the potential for grond water
contamination due to spills and inadequate commercial sewage treatment
facilities at interchanges is very high. 

Sam Frushour
 

Wed, 30 Oct 2002 08:50:15 -0500 (EST)
 

John and Gary
It did not take any time at all to find the source of the karst area
definitions on the INDOT route maps.  the source is here at the Indiana
Geological Survey and as it turns out the karst areas were taken from our
Miscellaneous Map #65 which is a karst map that includes caves, springs,
sinking stream basins and sinkhole areas.  The sinkhole area and sinking
stream basin areas defined were never intended to be complete but to show
the major areas.  Richard L. Powell put together these tow parts of the
map and I put together the cave and spring parts about 5 years ago. So,
the problem with the INDOT karst areas is that nothing is said about they
are supposed to be representative but not complete.  On the Miscellaneous
Map #65 there is a disclaimer about the completeness of the information.
I am pretty sure the disclaimer is also in the metadata that goes with the
GIS karst coverage.  The problem is one of people planning the highway
route not having more complete information and likely not knowing (or
caring) that their infromation is insufficient.  

Samuel S. Frushour, Head
Field Services Section
Indiana Geological Survey