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Standard Procedure for Groundwater Monitoring Well Construction <br /> Hollow Stem Auger Method (Continued) <br /> Page 2 of 2 <br /> To evaluate groundwater gradient and groundwater elevation, the well heads are <br /> surveyed to an assumed or legal bench mark depending on the requirements of the <br /> project <br /> Related Procedures <br /> • Standard Procedure for Hollow Stem Auger Drilling <br /> • Standard Procedure for Soil Sampling—Spirt Spoon Sampling <br /> • Standard Procedure for Equipment Decontamination <br /> • Standard Procedure for Groundwater Sampling—Petroleum Hydrocarbons <br /> 11ConocoPhilhpslRetad 5ites1111931Reports111193 Off-Site Well Install 1-05 doc <br />