01 / 811 and private lines
Private utility locating vs. 811
Understand what Virginia 811 marks, which private-property lines may require a separate investigation, and why many projects need both.
Open guideSubsurface intelligence, explained
Practical guidance for understanding underground infrastructure, investigation limits, and the records that support safer project decisions.
Featured guide
What 811 marks — and what it doesn’t
Public one-call marking and private utility locating serve different scopes. This guide explains ownership boundaries, common private lines, and how to plan for both before excavation.
Resource library
Start with the decision you need to make
Each guide connects a common project question to the appropriate field investigation, interpretation, or documentation path.
02 / Investigation method
How SafeLine scopes and documents a project
Follow the work from project question and field investigation through confidence classification and a usable record.
Open guide03 / Interpreted evidence
What affects a GPR investigation
Learn how ground conditions, target characteristics, survey design, and access affect what GPR evidence can support.
Open guide04 / Project records
Choosing a utility mapping deliverable
See how utility maps, KMZ files, congestion context, and verification recommendations serve different downstream decisions.
Open guidePlan a Subsurface Investigation
Move from useful guidance to a clearly scoped project conversation.
Plan a Subsurface InvestigationCall 1-866-677-2335contact@safelinesubsurface.com
Virginia and Washington, DC