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Mazch 2003, The pH value at spring 1 was the highest of all springs recorded (WY1995- <br />2003) at $.56. <br />Electrical Conductivity {EC) <br />Electrical conductivity (EC) is directly related to the concentration of ions in the water. <br />As would be expected, the springs overall show decreased electrical conductivity readings <br />during the high flow conditions of late winter and eazly spring and increased values with <br />decreased flow. EC values during the 2003 water yeaz were lower than those from prior <br />water years for springs 3 and 4. Spring 1 exhibited the lowest EC value of all springs <br />sampled this water yeaz with a March 2003 value of 250. <br />Total Dissolved Solids (TDS) and Total Suspended Solids (TSS) <br />Total dissolved solids (TDS) concentrations were slightly elevated in spring discharges <br />during this water year when compared to readings from prior water years. TDS <br />concentrations decrease with overall flow decrease, temperature increase, and pH increase <br />at both springs. As in the case of EC, spring 1 had the lowest concentration of TDS this <br />water year. Overall TDS concentrations have remained fairly consistent in spring 3 and <br />have increased slightly in spring 4. Total suspended solids (TSS) concentrations were <br />elevated in the Mazch 2003 sampling of spring 3 this water year. Spring 4 TDS levels <br />returned values within the historic range after a spike in TSS concentrations during the <br />first quarter of water year 2002. The spike is now considered an artifact of sampling. <br />During the 2003 water year concentrations of the major ions (alkalinity, bicarbonate, <br />calcium, chloride, magnesium, manganese, and sodium) remained within observed historic <br />ranges or slightly below historic ranges in springs 3 and 4. Values vary for constituent <br />concentrations between the springs; therefore brief descriptions of the trends will be <br />presented. Concentrations of the major ions in spring 1 were consistently much lower than <br />those of springs 3 and 4. This is not unexpected given the topographic position of spring <br />1 near the upper surface of the topographic rechazge area. <br />Alkalinity (as CaCO3) <br />AIkalWrity concentrations vary relatively widely for both springs. Spring 3 has values <br />ranging from 312 to 455 mg/L over the past nine water years. Spring 4 has shown <br />consistently lower concentrations than spring 3, ranging from 242 to 440 mg/L over the <br />same period. The average concentration has not changed significantly over this period for <br />either spring. This water year, spring 3 concentrations decreased to a historic low within <br />recorded observations (312 mg/L). Spring 4 alkalinity concentrations increased from the <br />all-time low last water yeaz to concentrations within the historic range prior to water year <br />2002. Alkalinity concentrations at spring 1 were the lowest at 167 mg/L during the March <br />2003 sampling. <br />u <br />Carbon Junction Mine Page 5 <br />Mnual Hydrdoglc RaPoRfor WatarYtar 2008 <br />