A)  Cracks in concrete slabs
B)  Spaces behind brick veneer walls that rest on
       an uncapped hollow-block foundation
C)  Pores and cracks in concrete blocks
D)  Floor-wall joints
E)  Exposed soil, as in a sump or crawl space
F)  Weeping (drain) tile, if drained to open sump
G)  Mortar joints
H)  Loose fitting pipe penetrations
 I)   Open tops of block walls
J)  Building materials such as some rocks
K  Water (from some wells)
 
Zone1 counties have a predicted average indoor radon screening level greater than 4 pCi/L (pico Curies per liter) (red zones)
High Risk Zone
 
Zone 2 counties have a predicted average indoor radon screening level between 2 and 4 pCi/L (orange zones)
Moderate Risk Zone
 
Zone 3 counties have a predicted average indoor radon screening level less than 2 pCi/L (yellow zones)
Lower Risk Zone
Fredericksburg
Pittsylvania and Orange are two counties in Virginia that have been identified as having potentially very rich Uranium Deposits,
I've had Real Estate Agents throughout Northern Virginia ask, "Is Radon really a risk in this area?"

My Answer: "Only if you don't breathe "
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Virginia Inspection Service, LLC - Home Inspections in King George
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Virginia Inspection Service, LLC - Home Inspections in Fredericksburg