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• Seasonal patterns are evident for conductivity and pH at both sites. <br />Conductivity is lowest during peak flow and increases during baseflow, <br />similar to the pattern on North Thompson Creek. There is little or no <br />difference between the upstream and downstream sites, The pH pattern <br />observed on Middle Thompson Creek is opposite of the one observed on <br />North Thompson Creek, The highest pH value generally occurs during <br />baseflow and lowest values during peak runoff. Both conductivity and <br />pH are in an acceptable range and are general indicators of good water <br />quality. <br />Water Quality <br />North Thompson Creek <br />During the field monitoring program, water quality samples were <br />collected, filtered, preserved and shipped to the laboratory for che- <br />mical analysis. The samples were collected for four consecutive quar- <br />ters, with at least one sample collected during the peak runoff. <br />• Representative samples were collected at mid-point, mid-depth in <br />plastic containers. They were then returned to the field lab and <br />divided into aliquots. Some aliquots were filtered through a 0.45 <br />micron membrane filter and preserved with acid to a pH of less than 2. <br />Some aliquots were left raw (unfiltered, unacidified). All aliquots <br />were placed on ice and sent to the laboratory for chemical analysis. <br />Laboratory results and the statistical analysis of the data from both <br />stations on North Thompson Creek are reported in Appendix 3-Q. <br />Water on North Thompson Creek is calcium-bicarbonate type. Figures <br />3.6.1.2-2 and 3.6.1.2-3 are trilinear diagrams used to classify the <br />water by plotting the major ions. Figure 3.6.1.2-2 presents plots of <br />the water type at the upstream and downstream sites collected on June <br />11, 1981. Figure 3.6.1.2-3 shows plots of the water type at the <br />upstream and downstream sites collected on August 31, 1981. <br />• <br />3-74 <br />