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Find possible radon entry routes

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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