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What is Contingency and How Does it Benefit Construction Management?

The word “contingency” has many different meanings, depending on the industry you serve or your point of view. In commercial construction, contingency refers to money (often a percentage of the total project cost) reserved to cover project costs that arise after construction starts. A contractor, an owner, or a design professional (aka architect, engineer, etc.) all likely feel that the proper use of contingency within a project stems from different, but justifiable causes.

Design professionals

For instance, a designer assumes responsibility for planning and designing a building that meets the expectations of the owner and complies with all building codes and regulations. However, to design a complete project that identifies every possible section or detail, and also accommodates every possible combination of material, model, or manufacturer is inconceivable. Therefore, in the designer’s eyes, it may be perfectly acceptable during the construction phase to use contingency spend to accommodate variations or updates that need to be made to the “as-bid” plan set.

For example, the architect discovers the brick specified for the project has been recently discontinued, is no longer in stock and only a more expensive brick is available and acceptable.

Owners

In contrast, if an owner is fortunate enough to have contingent funds in their budget, they are likely to prefer that they are used on project betterments. Perhaps to add items to the project that had been eliminated during design or value engineering, or maybe just to incorporate items from their wish list that hadn’t made it into the project initially. It is conceivable to see the justification for this case as well.

If contingency funds are still available late in a project, the owner could use the funds to purchase a higher grade flooring product than was identified on the original plans and specifications.

Contractors

Lastly, a contractor may take the stand that the use of contingent funds is reserved for unforeseen or differing conditions than those outlined in the plans and specifications upon which they based their bid. The contractor often has neither the responsibility nor the ability to know about certain conditions of the project and therefore should be entitled to additional compensation to address the issue, drawn from the project contingency. An example of this is when the contractor discovers old foundations buried on a project site that wasn’t documented on the plans and specifications.

Finding the right partner to guide decision making

Whatever your viewpoint, one thing is clear. Every project should have some measure of contingency included and its acceptable uses defined and agreed upon at the onset, you’re going to need it!

What’s important is having a team that can help guide decision making. As a full-service construction company, Bush combines our expertise in real estate development, architecture and building to provide our customers with a turnkey experience. As one team with one mission – your project – we can work unselfishly and transparently as a group to understand your needs and prioritize contingency budgets. Contact us to learn more about our fully integrated approach.

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Cement Soil Stabilization

Why Cement Stabilization?

Cement stabilization is required when the soil on a construction site needs to be amended. This process allows the installation of the building pad on-site before the cold temperatures and ground freezing of winter sets in.

At one of our new construction sites, Lujack Hiline – a high-end car dealership in Davenport, Iowa, a geotechnical engineer recommended we proceed with cement stabilization. It was no surprise – we could not drive our vehicles on the site without sinking. We were aware, after a very wet September, that we were going to be facing poor soil conditions. Unfortunately, there was no way for the soil to self-correct on this site since as we would not have been able to get the soil to compact before winter began. The ground just wasn’t hard enough.

While this predicament is fairly common for this portion of Scott County, we don’t have to use this method often. In this area, we generally hit moisture at 6-7 feet down. On many job sites, we may hit pockets of poor soil, but on the Lujack’s site, the entire 4-5 acres were moist. The site was much too large to core out and fill with rock-like we can on smaller jobs. Together with the owner, we made the decision to move forward with cement stabilization over the Thanksgiving weekend.

What is Cement Stabilization?

Soil stabilization can sometimes be done with lime, but since the temperatures were not warm enough for a long enough duration, this was not an option for this situation. Cement would need to be the cure.

Cement stabilization is the improvement of soil material through the addition of a cement binder. The goal of stabilization is to improve soil for construction purposes. The most common method involves the incorporation of small quantities of binders (cement) to the aggregate.

On the St. Vincent Athletic Complex football field project, we ran into a similar situation and were able to amend with lime. Lime is laid layer by layer and you can see the difference in color. We rototilled the lime in and then rolled it over. The process took two days for each football field. The lime was brought in from our sister company, Linwood Mining; truck after truck. Just like at Lujack’s, the ground wasn’t stable, and we couldn’t guarantee the fields without stabilizing the soil.

At Lujack’s we chose the cement process as it was recommended by the geotechnical engineer, it was weather appropriate and it was the most cost-effective option. Cement stabilization requires only one layer, but the air temperature is key. The temperature must be 40 degrees or higher for the stabilization to set appropriately.

How does Cement Stabilization Work?

Since we do not have a local company that performs cement stabilization, we hired McCleary from Decatur, Illinois. They set 200 lbs. of cement every three feet. The machine itself costs $800,000. Also, on-site was a tiller and two trucks. The two trucks each weighed over 15,000 lbs. McCleary remediated 170,000 SF in two 12-hour days. If we had decided to core out and fill the site with rock, it would have taken at least two weeks and we would have needed to find a place for 1,000 truckloads of spoils.

The cost to stabilize the soil ran approximately $200,000. If we had filled with rock, the cost would have been around $300,000. A savings of nearly 33%.

The cement stabilization was a success and construction is in full swing.

 

Location: Lujack’s HiLine – Audi, Mercedes-Benz, Porsche, Volkswagen

Kevin Mericle | Superintendent | Bush Construction

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