C O B B C O U N T Y D O T C H A N G E O R D E R S & S U P P L E M E N T A L A G R E E M E N T S

Georgia Chapter of ASHE Presented by Mike CatesPre-Construction EngineerCobb County Department of Transportation

April 15, 2011

What Happens when a Change Order is required?

Cobb County Slide 3

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•Major Impacts to Staff Time

•Board of Commissioners must approve

•Public Meeting, televised, newspaper, etc..

•Major impacts to staff time

“Bad” Change Order….

Cobb County Slide 3

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Original Contract $6,705,710.12Supplemental Agreement No. 1 $ 38,992.25Supplemental Agreement No. 2 $ 91,011.99Supplemental Agreement No. 3 $ 101,723.08

Supplemental Agreement No. 4 $ 45,902.50Supplemental 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 LineSA #2 Drainage not identified by surveyorSA #3 Owner directed (Added Sidewalk)SA #4 Incorrect Traffic Work (lengthened decel lanes)SA #5 Over-Run of Erosion Control QtysSA #6 Drainage and Asphalt Over-runs

“Good” Change Order….

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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…….

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Cobb County Slide 2

Common Causes of Change Orders

Survey – “missed” information Designer unfamiliar with Project Site Calculation of Quantities Looking at the plans in 3D Designer familiarity with GDOT Spec Book

Survey Issues

Cobb County Slide 4

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•Most Important part of the design•Investigation of missing drainage•Identification of Utility Easements•Correct Location of Existing R/W & PL

Walking the Job…

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•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

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• Read them and incorporate comments into the plans

Geo-Tech Reports

• Too dependent on Computer

Quantities

• Future Cobb Project – all consultants will utilize the same SOQ Sheets to be provided by Cobb

Should be calculated “sheet by sheet”

Cobb County Slide 6

Quantities

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Common Quantity Busts

Asphalt Items, GAB, Concrete, Retaining Walls

Leveling IssuesErosion Control – Mulch, Silt Fence

Always triple check your big

ticket quantities!

Plans are 3D

Cobb County Slide 8

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TSDesigners should take the XS, and at each station compare XS to Plan Sheets.

Do Construction Limits match?

Are we inside R/W & Easements

Are there existing ditches being filled in?

Is this slope appropriate?

Spec Book

Cobb County Slide 9

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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?

THANK YOU

Mike Cates, Construction EngineerCobb County Department of Transportation

www.cobbcounty.org

Pictured: Construction on Windy Mac

Cobb County Slide 10