Looks like easy access for the, possibility of radon gas to enter
2nd para "radon gas can enter a home from the soil through cracks in concrete floors and walls, floor drains, sump pumps, construction joints, and tiny cracks or pores in hollow-block walls"
How radon enters your house-
a) cracks in concrete slabs
b) spaces between brick veneer walls that rest on uncapped hollow brick foundation
c) pores or cracks in concrete blocks
d) floor-wall joints
e) exposed soil, as in a sump
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)
these INSIDE companies who love to install inside drain tile and baseboard systems w/sump pumps, 1) they drill HOLES in hollow-block walls 2) they often leave the bottom 6" or so of any crack in wall…OPEN 3) they often leave the ‘cold joint’ OPEN 4) some install sump pumps with no cover or cheap cover AND…they do NOT seal many, if any of the items listed above on the OUTSIDE.