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Sampling strategy graphicsite guide button
   The VAS study was designed to sample public supply wells across the Commonwealth. The five physiographic provinces of Virginia were the bases for the definition of regional aquifer systems.  Some provinces were further subdivided on rock type or depth.  The Coastal Plain aquifer systems predominantly consist of unconsolidated sediments, whereas the other aquifer systems are represented by fractured rock aquifers.

 
Table heading
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Appalachia Plateaubutton
Appalachian Plateaus Scene

Appalachian Plateaus
system

 13 CFCs, Tritium, and SF6

 

Blue Ridgebutton

Blue Ridge Scene

Blue Ridge
system

 17 CFCs, Tritium/Helium-3, and SF6

 

Coastal Plainbutton
Coastal Plain Scene Shallow aquifer system
(<200 feet)		 34 CFCs, Tritium/Helium-3, and SF6
Middle aquifer system
( 200 to 400 feet)		 20 Carbon-14
Deep aquifer system
(>400 feet)		 11 Carbon-14 

 

Piedmontbutton
Piedmont Scene

Piedmont
system

 30 CFCs, Tritium/Helium-3, and SF6

Valley & Ridgebutton

Valley & Ridge Scene

Carbonate
system

 21 CFCs, Tritium/Helium-3, and SF6

Siliciclastic
system

 25 CFCs, Tritium/Helium-3, and SF6

Last Updated on 2/4/2002
By David L. Nelms
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Last update: 09/15/04 12:55