Top of Casing Survey (TOC)

About This Service

Spiral Constructions offers accurate Top of Casing (TOC) survey, which is an essential to determine groundwater flow direction. Time for the TOC survey is included in the monitoring well installation. The TOC survey should be standardized to measure the elevation of the top of the well on the NORTH side of each well casing. It may be appropriate to put a mark or small notch in the casing to indicate where the casing elevation was measured, thereby ensuring that depth-to-water measurements (measured to a hundredth of a meter) are consistent and accurate.