From the A-42:

• take the exit marked Herne Baukau
• continue towards Recklinghausen for about 700 meters
• at the roundabout take the third exit
• turn into Forellstraße and continue for
  approximately 800 meters
• turn left into Baukauer Straße and continue for yet another 300 meters
• turn left and take the entrance in Baukauer Straße 86