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B.7. Standard Test Method for the Measurement of Water Levels in <br /> Groundwater Monitoring Wells <br /> B.7.1. Introduction <br /> Water level measurements shall be taken prior to any sampling or well purging. These <br /> measurements are needed to determine the effects of mining operations, calibrate <br /> transducers, determine the volume of water in the well and help interpret the monitoring <br /> results. High water levels could indicate recent recharge to the system, which would dilute the <br /> sample. Low water levels could reflect the influence of nearby production wells. <br /> Documentation of non-pumping water levels also provides historical information on the <br /> hydraulic conditions at the site. <br /> B.7.2. Scope <br /> Water levels shall be measured from the top of the outer well casing and, for consistency, shall <br /> always be made from the same spot on the well casing. Referenced datum should be <br /> correlatable with Daub recorded ground level. NS has historically used small structures over <br /> many sampling wells. Where this is the case, the water level shall be made from the door side <br /> of the structure. Note that this location should be recorded in the event that the structure is <br /> removed. If the planning documents do not specify a reference point and other reference <br /> points do not exist,the measurement shall be made on the north side of the well casing. <br /> B.7.3. Terminology <br /> Conductivity cell— A simple electrical circuit that, when completed, causes electrical current to <br /> flow. <br /> Dedicated water-level probe — A stainless steel probe permanently attached with <br /> polyethylene tubing to the cap of a well and used to obtain water-level information. <br /> Electric water-level sounder — An electronic probe that uses a conductivity cell to activate an <br /> alarm when it contacts a conductive liquid; often referred to as the M-Scope. <br /> Electronic/pneumatic water-level meter — A device that uses an internal compressed air <br /> source (pneumatic) to force air down the dedicated water-level probe. The meter senses the <br /> amount of pressure needed to push the water out of the dedicated water-level probe using a <br /> pressure transducer and associated circuitry and software (electronic). The meter converts this <br /> pressure to the depth of submersion of the probe. <br /> Monitoring well — A well installed for the purposes of obtaining water quality data, <br /> hydrogeologic information, and/or water-level data. <br /> Daub &Associates, Inc. Page B-18 Natural Soda LLC 2022 SAP <br />