STUMPF Serving S.E. lowa for over 30 years. CONCRETE Residential, Commercial, Agriculture, Foundations And Flat Work. Available for all your concrete needs. Call Rod 319-330-0410 or Kolton 319-330-4592 Kalona, lowa STUMPF Serving S.E. lowa for over 30 years. CONCRETE Residential, Commercial, Agriculture, Foundations And Flat Work. Available for all your concrete needs. Call Rod 319-330-0410 or Kolton 319-330-4592 Kalona, lowa