Your scoliid wasp is targeting grubs, which flourish in damp soil. Irrigated lawns create optimal conditions for them every year, but most homeowners have had dry lawns during grub season the past few years and thus few beetles. For areas now getting plentiful rain, that means more grubs will survive to be Japanese or other beetles next year. Thus your wasp is very beneficial. This parasitoid lays its eggs on beetle grubs, so their larvae can feast on them. Scoliid wasps are, indeed, a type of mining bee, sometimes known as a digger wasp, that disappears at the end of summer. Its individual hole must be elsewhere in the vicinity. No control is recommended.