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Change Orders & Supplemental Agreements in Cobb County DOT

Learn about the impacts and process of change orders and supplemental agreements in Cobb County Department of Transportation. Presented by Mike Cates, Pre-Construction Engineer.

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Change Orders & Supplemental Agreements in Cobb County DOT

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  1. Cobb County DOT Change Orders & Supplemental Agreements Georgia Chapter of ASHE Presented by Mike CatesPre-Construction Engineer Cobb County Department of Transportation April 15, 2011

  2. What Happens when a Change Order is required? Change Orders & Supplemental Agreements Major Impacts to Staff Time Board of Commissioners must approve Public Meeting, televised, newspaper, etc.. Major impacts to staff time Cobb County Slide 3

  3. “Bad” Change Order…. Change Orders & Supplemental Agreements Original Contract $6,705,710.12 Supplemental Agreement No. 1 $ 38,992.25 Supplemental Agreement No. 2 $ 91,011.99 Supplemental Agreement No. 3 $ 101,723.08 Supplemental Agreement No. 4 $ 45,902.50 Supplemental Agreement No. 5 $ 38,312.37 Change Order No. 1 (final) $ 84,270.45 Revised Contract $7,105,922.76 SA # 1 Incorrect Identification of Water Line SA #2 Drainage not identified by surveyor SA #3 Owner directed (Added Sidewalk) SA #4 Incorrect Traffic Work (lengthened decel lanes) SA #5 Over-Run of Erosion Control Qtys SA #6 Drainage and Asphalt Over-runs Cobb County Slide 3

  4. “Good” Change Order…. Change Orders & Supplemental Agreements Original Contract $8,750,220.30 Change Order No. 1 (final) $ (52,050.15) Revised Contract $8,698,170.15 No Issues with Plans were discovered requiring Change Orders One final Change order with a savings……. Cobb County Slide 3

  5. Common Causes of Change Orders Change Orders & Supplemental Agreements Survey – “missed” information Designer unfamiliar with Project Site Calculation of Quantities Looking at the plans in 3D Designer familiarity with GDOT Spec Book Cobb County Slide 2

  6. Survey Issues Change Orders & Supplemental Agreements Most Important part of the design Investigation of missing drainage Identification of Utility Easements Correct Location of Existing R/W & PL Cobb County Slide 4

  7. Walking the Job… Change Orders & Supplemental Agreements Many designers do drive-throughs of the project site Few take the time to walk key parts of the job Should be done as soon as preliminary layout is created Should be done prior to turning in Prelim Plans Cobb County Slide 5

  8. Quantities Change Orders & Supplemental Agreements Cobb County Slide 6

  9. Quantities Change Orders & Supplemental Agreements Cobb County Slide 7

  10. Plans are 3D Change Orders & Supplemental Agreements Cobb County Slide 8

  11. Spec Book Change Orders & Supplemental Agreements Designers need to be more familiar with GDOT Spec Book Examples: 1. Pilot Holes – Pay Length is from top of ground not top of rock. 2. Grading Complete – What is included? Cobb County Slide 9

  12. Pictured: Construction on Windy Mac Thank You Mike Cates, Construction Engineer Cobb County Department of Transportation www.cobbcounty.org Cobb County Slide 10

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