2022-01-18_HYDROLOGY - M1983194 - Laserfiche WebLink

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B.7.4. Significance and Use Accurate measurements of water depth are necessary in the calculation of well bore volumes, measurements to the nearest 1/100 of a foot are standard. B.7.5. Water-Level Measurements Using an Electric Sounder Apparatuses include: • Electric sounder (There are many adequate electric sounders available; this procedure covers most models.) • KimwipesTM or equivalent lint-free tissue • Distilled or deionized water in a squeeze wash bottle • Measuring tape with an engineering scale B.7.5.1. Procedure The following procedure is supplemental to the instruction found in the instrument-specific operating manual: • Slowly lower the probe into the well until the indicator sounds. It may be necessary to adjust the sensitivity level. • Raise the probe slightly until the indicator stops sounding. • Carefully lower the probe until the indicator sounds again and read the depth to water to the nearest 1/100 of a foot, using a measuring tape with an engineering scale if necessary. • Repeat Steps 3 and 4 until a repeatable measurement is achieved. • Record the depth to water to the nearest 1/100 of a foot. • Slowly withdraw the probe from the well (so it does not rub on the top of the casing) while wiping the cable with a lint-free tissue moistened with distilled or deionized water. • Clean the probe with distilled or de-ionized water and wipe dry with a lint-free tissue. B.7.5.1.1. Procedure Bias With this method, water-level measurements must be repeatable to approximately 1/100 of a foot. B.7.5.2. Quality Assurance • The following information shall be logged when taking water-level measurements. • Date and time of measurements • Well identification and site • Name of person performing the measurement • Reference point if not top of casing • Remarks if necessary (e.g., wells pumping nearby, recent heavy rains, ice in well) • Depth to water Daub&Associates, Inc. Page B-19 Natural Soda LLC 2022 SAP