Laserfiche WebLink
The lowest sulfate/bicarbonate ratio in 2008 was recorded at monitoring site TR-A in August <br />and October with a value of 0.1 SO4 (meq)/HC03 (meq) and the high was recorded at <br />monitoring site TR-C in April with a value of 2.9 SO4 (meq)/HC03 (meq). <br />3.3.8 Surface Water Manganese <br />Chart 13 shows manganese concentrations for monitoring sites TR-A, TR-B, TR-C and TR-D <br />for the period of record. Manganese shows fairly consistent values since 1989. Most of the <br />manganese values observed are consistent with baseline values. Manganese values appear to <br />be developing a trend, which may be directly related to flow in Trout Creek as are the TDS <br />concentrations. Sampling in October of 2005, at site TR-D, produced an inconsistent spike of <br />manganese up to 0.248 mg/L. Manganese remained within historical levels at all other sites <br />along Trout Creek in October 2005. The October water quality data was re-analyzed and the <br />original values were confirmed. There is no apparent reason for this sudden rise in value. <br />Site TR-D normalized over the last few years, regarding the October 2005 spike, and <br />concentrations on average for all sites are low in comparison with the past decade. The <br />concentration trend seemed to have reversed during 2006 with higher concentrations resulting <br />during low flow in Trout Creek, however the 2007 and 2008 values fall back to the expected <br />trend of decreasing concentrations according to flow. The lowest manganese concentration in <br />2008 was recorded at monitoring site TR-A in April with a value of 0.007 mg/L and the high <br />was recorded at monitoring site TR-D in April with a value of 0.069 mg/L. <br />3.3.9 Surface Water Aluminum <br />Chart 14 shows aluminum concentrations for monitoring sites TR-A, TR-B, TR-C and TR-D <br />for the period of record. Aluminum concentrations have been low with most being below <br />detection limits throughout the duration of monitoring. The apparent elevated aluminum <br />levels shown in 1995 were due to the laboratory lower detection limit being set at 0.2 ppm <br />instead of 0.05 ppm. Aluminum was elevated at TR-C during the April 2002 sampling period. <br />However, concentrations downstream of TR-C are consistent with previous sampling results. <br />Therefore, either sample contamination or laboratory error is suspected. Aluminum was <br />slightly elevated during the 2004 and 2005 sampling periods. The 2008 sampling period <br />shows consistent sampling results with the past decade. The lowest and highest aluminum <br />concentration in 2008 was the lower detection limit of <0.03 mg/L at all sites for all events. <br />3.3.10 Surface Water Unionized Ammonia <br />Chart 15 shows unionized ammonia concentrations for monitoring sites TR-A, TR-B, TR-C <br />and TR-D for the period of record. Unionized ammonia concentrations have been consistently <br />below detection limits. The unionized ammonia concentration appeared to drop for the 1997 <br />through 1999 monitoring periods due to the laboratory lowering the detection limit from 0.05 <br />ppm to 0.01 ppm. In 2000, the laboratory raised the detection limit for unionized ammonia <br />back to 0.05 ppm, then lowered the detection back to 0.01 ppm in 2001. The 2008 sampling <br />period shows consistent sampling results to all previous events. Unionized ammonia <br />7