You are the project manager for a construction company. Your firm has been contracted to complete the drilling of a well for a new cabin in Arkansas. The specification of the well is documented, but your company has little experience in well drilling in Arkansas. The stakeholder is concerned that your time estimates are not accurate since the soil and rock in Arkansas is much different from the soil in your home state. Which one of the following can you use to ensure your project estimates are accurate?

Using a commercial duration estimating database for Arkansas

Using expensive contractors to prepare the estimate

Doing soil samplings from the US government of soil and dirt

Using n order of magnitude estimate to improve the accuracy level