An accurate Top of Casing (TOC) survey is an essential to determine groundwater flow direction. Time for the TOC survey is included in the well installation (Section 6 of the Scheduled Pay Items). It is generally not necessary to perform this survey more than once for any site, other than to “tie in” new wells as they are installed (although the survey for TOC is best left until the first sampling event to allow time for the casing to settle). The TOC survey should be standardized to measure the elevation of the top of the well on the NORTH side of each well casing.
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