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(guitar music) - [Instructor] This video demonstrates techniques to establish a permanent land surface datum, nearby reference marks, and a measuring point from which groundwater levels at a well are measured. The materials needed include keys, wrenches, or other tools to access the well, an engineers ruler or measuring tape graduated in feet, tenths, and hundredths of feet, a field notebook and a writing implement, a groundwater site inventory, GWSI System Groundwater Site Schedule form, metal file and permanent marker, spray paint, hammer and cold chisel, survey monuments, such as a nail, spike, or tablet, camera, protractor, calculator, or other tools to calculate angles and lengths, topographic map or rod, leveling instrument, leveling note sheets, and differential GPS. Step one, establish land surface datum. The land surface datum at a well is a fixed reference mark located at or near the land surface that can be used to measure the altitude of the land surface datum, as well as