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Find possible radon entry routes

Directions:
Look at the diagram of the house and find the correct entry route for each letter. Write the number on the line provided.

Diagram of the house

A. _____ 1. Loose fitting pipe penetrations
B. _____ 2. Pores and cracks in concrete blocks
C. _____ 3. Building materials such as some rock
D. _____ 4. Open tops of block walls
E. _____ 5. Spaces behind brick veneer walls that rest on uncapped hollow block foundation
F. _____ 6. Weeping (drain) tile, if drained to open sump
G. _____ 7. Cracks in concrete slabs
H. _____ 8. Exposed soil, as in a sump
I. _____ 9. Mortar joints
J. _____ 10. Floor-wall joints
K. ____ 11. Water (from some wells)

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