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Sampling of subsurface water from monitoring wells was <br />• .conducted using a submersible pump system. The major <br />components of this system include a Grundfas 1/3 HP stainless <br />steel submersible pump and 1" diameter nylon reinforced <br />discharge tubing equivalent to "Tygon" type tubing. The <br />equipment is powered by a truck mounted electrical generator. <br />The discharge capacity of the pump is approximately 5 gpm. <br />Two casing volumes ere removed prior to the sampling of <br />discharging well water. However, some of the wells, <br />particularly SMW-1 and DH-172 hove very slow recovery rates. <br />In these instances, one casing volume is evacuated prior to <br />sample collection from such wells. <br />After water samples are collected in appropriate bottles <br />containing the required preservatives, they ere kept cool in <br />an insulated container. Samples are delivered within several <br />hours to the laboratory where they are filtered and prepared <br />for analysis. At the well site, readings of pH, EC, <br />temperature (oC) and water level are recorded. Water levels <br />are measured with a tape measure from the top of the casing <br />and recorded prior to pumping. <br />Water Ouelity <br />Water quality data has been accumulated from ell aquifers <br />(Appendix A, McWhorter, p. 29 thru 35). Generally, the waters <br />• in the Laramie Shales and the target cool would be <br />unacceptable for most uses. The total dissolved solids <br />concentrations were from 1500 to 7000+ mg/1. In addition, the <br />sodium absorption ratios CSAR> were 10 to 18, making the water <br />mostly unsuitable for irrigation. The Fox Hills water. <br />possessed TDS of 650+ mg/1, while Ennis Draw ground-water TDS <br />is 750-1000 mg/1. All water quality data collected to dote in <br />the vicinity of the ash disposal area is summarized in <br />Appendix C. <br />Electrical conductivity la measured in unite of micro Siemens per <br />cm. Since the conductivity meter used measures the electrical <br />conductivity at the sample temperature, the reading must be <br />converted to a specific conductivity by applying a temperature <br />correction and cell correction. The cell correction or cell <br />constant can vary from meter to meter or, for the same meter, can <br />vary with time. For this reason, a cell constant la checked on e <br />regular basis and is determined by comparison of the conductivity of <br />a standard .01M KC1 solution et a given temperature to published <br />data. <br />A map showing the location of the monitoring wells is presented in <br />4.6.3 (e>. <br /> <br />-35- <br />