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<br />1943 <br /> <br />:-~R2UfvjjNARY fiEP(;:" <br />':' '0 lC/"'T T,"') ~r.:' ;-' <br />". ....) '..h.~ ........ ....... '._' I , .. <br /> <br />. <br /> <br />Figure to near here. <br /> <br />Figure 11 near here. <br /> <br />Table 6 near here. <br /> <br />Estimates were made of the frequency of occurrence ofspecific"conductance values at station 07099400 and <br /> <br />at the diversion points forthe Pueblo Board of Water Works and the St. Charles Mesa Water District domestic water <br /> <br />supplies. This information and the observed relations between specific conductance and dissolved"solids concentra- <br /> <br />tion were used to estimate the percentage of time the dissolved-solids concentration exceeded the SMCL for drink- <br /> <br />ing water (500 mglL). A comparison of specific-conductance data that have been collected at station 07099400 with <br /> <br />.ata collected at the diversion points for the Pueblo Board of Water Works and St. Charles Zvlesa Water District <br /> <br />domestic water supplies indicates that specific conductance increases about 3 percent per mile in that reach. An esti- <br /> <br />mate was made, based on this relation, of the frequency of occurrence of specific conductance at the diversion points <br /> <br />for the two municipal water supplies (fig. 12). These estimates were made by increasing the frequency of occurrence <br /> <br />for specific conductance at station 07099400 by 12 percent for tbe Pueblo Board of Water Works diversion and by <br /> <br />27 percent for the St. Charles Mesa Water District diversion. Cain (1987) detennined, via regression analysis. that <br /> <br />a specific conducrance of 718 IlS/cm at station 07099400 is equivalent to a total-dissolved solids concentration of <br /> <br />500 mg/L. It was assumed that the conversion was also applicable at the two water-supply diversion points. There- <br /> <br />fore, the dissolved-solids concentration at station 07099400 and at the two water-supply diversion points was esti- <br /> <br />mated to exceed 500 mglL when specific conductance exceeded 718 IlS/cm. During 196-1-74, the estimated percent <br /> <br />exceedance of a specific conductance of 718 IlS/cm was 28 percent at station 07099400, 45 percent at tbe Pueblo <br /> <br />Board of Water Works diversion, and 55 percent at the 51. Charles Mesa Water District diversion point. After the <br /> <br />enstruction of Pueblo Reservoir (1975-1994), the percent exceedance of a specific conductance of 718 1l5/cm <br /> <br />23"'- <br />