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To evaluate groundwater gradient and groundwater elevation, the well heads are surveyed <br /> to an assumed or legal bench mark depending on the requirements of the project. <br /> Related Procedures: <br /> • Standard Procedure for Hollow Stem Auger Drilling <br /> • Standard Procedure for Soil Sampling—Split Spoon Sampling <br /> • Standard Procedure for Equipment Decontamination <br /> i <br /> i <br /> I <br /> i <br /> I <br /> t <br /> k <br /> F. <br /> FF <br /> f <br />