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• pH pH values of the springs fluctuate seasonally, with values generally remaining on the slightly basic side. The pH values aze not particulazly well correlated to season or spring temperature, though in general, pH values appear correlated to flow, with lower (more neutral) pH values during higher flow conditions. The pH value at Spring 1 was the highest of all springs recorded at 8.56 in water year 2003 but attenuated last year to a more neutral pH 7.6 and decreased slightly this water yeaz to 7.27. As there aze few recent measurements for pH from this spring, it is unknown whether this represents a normal fluctuation or is indicative of a trend. In general, Spring 3 has higher flow and lower overall pH values than Spring 4. In water years 1995 and 1996, pH values fluctuated through the seasons, being lower during high flow and higher during low flow times. During the prior three water years, pH values at both springs have shown very slight increases in the alkaline range. The pH at Spring 3 peaked during the first quarter of water year 2001, and showed a slight decrease in water year 2002, a slight increase in water yeaz 2003, and a decrease this water yeaz to values consistent with those of the mid- 1990's (7.28-7.31). Spring 4 pH peaked in water yeaz 2002, decreased through water yeaz 2003 to 7.51, and increased in water year 2004 to 8.02. This year pH values at Spring 4 decreased from 7.79 to 7.22 (a historic low). Electrical Conductivity (EC) • Electrical conductivity (EC) is directly related to the concentration of ions in the water. As would be expected, the springs overall show decreased electrical conductivity readings during the high flow conditions of late winter and early spring and increased values with decreased flow. Spring 1 exhibited the lowest EC value of all springs sampled this water year with a March 2003 value of 392. This value appears consistent with the value from the 2003 sampling. EC values for Springs 3 and 4 during the 2004 water yeaz were lower than those from water years prior to 2001. This may be related to the overall drier conditions over the last several years. Total Dissolved Solids (TDS) Total dissolved solids (TDS) concentrations were consistent this water yeaz when compared to readings from prior water years. TDS concentrations decrease with a corresponding decrease in flow, temperature increase, and pH increase at the springs. As in the case of EC, Spring 1 had the lowest concentration of TDS this water year. Overall TDS concentrations have remained fairly consistent in Spring 3 and have increased slightly in Spring 4. Spring 4 TDS levels returned values within the historic range after a spike in TSS concentrations during the first quarter of water year 2002. The spike is now considered an artifact of sampling. n Carbon Junction Mirre Page 6 Annual tiydroiogic Report for Water Year 2006