Call 811 Before You Dig
We've all seen or heard the commercials for 811, "Call Before You Dig," especially pre-spring and early spring when homeowners and landscapers are preparing to rip out plants, cut trees, pull out stumps, plant new foliage, till up your garden, dig footers for the new deck or gazebo, etc...
Why call 811? To prevent damage to underground utility lines and cables. If you damage them, you pay the expense to repair them. Besides the cost of repairs, you risk causing damage to your home should you crack a water, sewer or gas line.
Each Utility comes with its own color scheme (ie: water lines are blue, electric is red, pressurized gas is yellow, cable TV is orange, and so on.
New Hampshire Public Utilities Commission, Safety Division, has a great handbook readily available for download called "New Hampshire Excavator Manual." Contact chuck@SERVPROderrylondonderry.com and I will send you the pdf version.