My pool equipment is housed in a gated enclosure with a dirt floor. Of course, concrete pads have been poured to support the filter, pumps, and heater, but there's just raw dirt in there. I'm seeing a growing number of burrows and not sure how to control them. The entrances are about 1" in diameter, so I don't think I'm looking at rodent burrows. Anyone familiar with identifying burrows in the region?