For which of the following project site conditions would it be appropriate to supplement traditional optical surveying methods with GPS land surveying technology when staking?

Question

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It would be appropriate to supplement traditional optical surveying methods with GPS land surveying technology when staking a sewer alignment through an unimproved easement in hilly terrain. GPS land surveying technology is beneficial for use on projects where lines of sight needed for traditional optical surveying are obstructed and/or access along an alignment is difficult or dangerous. Recent advances in GPS technologies have resulted in lower equipment costs and increased crew productivity rates.

For Which of the Following Project Site Conditions Would It