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Where: <br /> • r =radius of well casing (ft) (the radius of the well is obtained from the well completion logs <br /> or can be measured with a tape measure) <br /> • hl =depth of well (ft) from the top of the well casing (the depth of the well is obtained from <br /> the well completion logs) <br /> • 112 =depth to water (ft) measured from the top of the well casing (the depth of water is <br /> measured using Section 13.7, "Standard Test Method for the Measurement of Water Levels <br /> in Groundwater Monitoring Wells") <br /> B.8.5. Procedure: Well Bore Fluid Purging Using a Bailer <br /> Apparatus includes: <br /> • Appropriate bailer and cabling for the well <br /> • Typically the well bore fluid volume will be calculated and the bailer will be lowered into the <br /> well multiple time to withdraw three or more well bore fluid volumes. Once the well bore <br /> fluid volumes have been removed,the bailer well withdraws a sample. <br /> B.9. Standard Test Method for the Field Measurement of Specific <br /> Conductance (Conductivity) <br /> B.9.1. Introduction <br /> Specific conductance is a widely used indicator of water quality. It measures the ability of <br /> water to carry an electrical current under specific conditions. This ability depends on the <br /> presence of ions and their total concentration, mobility, and temperature. Specific <br /> conductance is a simple indicator of change within a system and is used as an aid in evaluating <br /> whether a sample is representative of the water in the system. <br /> B.9.2. Scope <br /> This procedure describes the field measurement of the specific conductance of an aqueous <br /> sample. The specific conductance is measured using a conductance meter and a platinum or <br /> stainless steel electrode. <br /> B.9.3. Significance and Use <br /> The specific conductance or conductivity of a sample is defined as the conductance of the <br /> sample between opposite sides of a cube, 1 centimeter (cm) in each direction. Because it is <br /> impractical to build electrodes with these characteristics, electrodes are manufactured in <br /> various forms. A cell constant is determined by measuring a solution of known conductivity. <br /> Solutions of known conductivity are purchased or can be made from reagent-grade potassium <br /> chloride. Sampling technicians shall consult operating instructions for the specific instrument <br /> used for the determination of the cell constant. This conductivity is expressed in micromhos <br /> per centimeter (µmhos/cm). Note µmhos/cm is equivalent to microSiemens per centimeter <br /> VS/cm <br /> Daub &Associates, Inc. Page B-22 Natural Soda LLC 2022 SAP <br />