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SAMPLING METHODOLOGY <br /> A Solinst electronic water sounder will be used to measure ground-water elevations. The <br /> manufacturer claims accuracy of measurement of t 5/100-foot (0.05-foot) at a measurement <br /> length of 40 feet. Measurements will be recorded of the interval between the static water <br /> surface and the marked top edge of the well casing. <br /> Temperature, electrical conductivity, and pH measurements will be-made using a Hydac tester <br /> with an external electrode, which has an integrated electronic thermometer with variable <br /> temperature compensation selectivity. All pH measurements will be read to within 0.1 standard <br /> pH units, and have manufacturer specified accuracy of deviation of no greater than :k 0.01 <br /> standard pH units at discrete temperatures in the range of 55° to 75° F. Electrical conductivity <br /> measurements will be read to within 10 uohm/cm, and have manufacturer specified accuracy of <br /> deviation of no greater than ± 3% of full scale. <br /> Each of the monitoring wells will be purged prior to sampling with a two-inch submersible <br /> pump until water-quality parameters (pH, conductivity, and temperature) are stabilized in <br /> rr <br /> accordance with EPA protocols. No parameter will vary more than 10 percent from previous <br /> measurements. Each of the wells will be allowed to settle for an hour before taking water <br /> samples. Purged well water will be contained in 55-gallon drums, properly labeled, and staged <br /> for disposal. <br /> V <br /> Ground-water samples will be collected using a submersible pump, and, or disposable <br /> polyethylene bailers. Samples will be bottled, preserved, labeled, and stored on ice in a cooler. <br /> Ground-water samples will be transported under chain of custody to the laboratory and <br /> analyzed within the EPA-specified holding times for the requested analyses. <br /> Prior to subsequent use, the submersible pump, discharge hoses, and other tools will be <br /> thoroughly washed with an Alconoxo or tri-sodium phosphate (TSP) solution to remove soils <br /> and coatings. The submersible pump, hoses, and tools will be carefully rinsed with distilled <br /> .r water to remove any remaining water-soluble contaminants. <br /> Sierra-Pacific Groundwater Consultants, Inc. B-1 <br /> .r <br />