WOLFF UNDERGROUND CORPORATION
dba WOLFF UNDERGROUND
BLACK CREEK, WI
07/24/2008
2
Power Units
2
Drivers
Current
as of today
Active · 2 power units · 2 drivers · Black Creek, WI
2025
Sep 25, 2025
MCS-150 biennial update filed
Reported mileage: 50,000 (2024)
Reported power units: 2
Reported drivers: 2
Reported trailers: 2
2023
May 23, 2023
MCS-150 biennial update filed
Reported mileage: 30,000 (2022)
Reported power units: 1 → 2
Reported drivers: 2
2022
~Apr 2022
Fleet grew 1 → 2 power units
2021
~Jul 2021
Legal name changed
HYCLEAN INC → WOLFF UNDERGROUND CORPORATION
May 6, 2021
MCS-150 biennial update filed
Reported mileage: 1 (2020)
Reported power units: 1
Reported drivers: 1 → 2
2008
Jul 24, 2008
DOT registered
Company registered with the FMCSA.
Jul 24, 2008
MCS-150 biennial update filed
Reported power units: 1
Reported drivers: 1