Strawberry Creek: A Case Study

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In the Caruso and Dawson journal article (2009) “Impacts of groundwater metal loads from bedrock fractures on water quality of a mountain stream”, the flow rate for the USGS sampling point SW01 at Strawberry Creek was measured with the maximum flow 21 ft3/s. The mean flow rate for SW01 is 1.22 ft3/s and the median flow is 0.84 ft3/s. The sample point flows upstream from the fractures, SW09 and SW07, were estimated using SW01. The data that was estimated is skewed to a greater value. The difference in values of the estimation may not be representative of the full range of flows, because of the small sample size of flows. The differences of 50% of the USGS estimates from actual flow measurements are considered adequate for remedial planning purposes. …show more content…
The reason for the higher concentrations is the waste treatment plant discharge is in the same area as SW09. The Cd and Zn concentrations for SW09 and SW08 were higher during the October 2010 event and lower throughout the other two events. The Cu concentrations were the same between SW09 and SW08 throughout the October 2000 event, but decreased 48-89% during the other events. Due to flow not being measured at SW09 during the May 2001 sampling event, the concentrations were not able to be calculated. The Cd, Cu and Zn concentrations for SW007 and SW06 throughout the October 200 and the May 2001 remained constant, but decreased during the June 2003 …show more content…
A mass balance test was conducted to confirm that the toxic materials in the wastewater were Al and Zn. It was found that Al and Zn were the toxic materials in the FE sample that attributed to the low pH. Limestone gravel is used in the successive alkalinity producing system (SAPS) to add alkalinity to the wastewater. The findings suggest that along with dissolved metals, unfiltered particulate from the limestone gravel contributed to the toxicity of the Samma water treatment system effluent.Several studies suggest that very small particles of Al2O3, FeO, CuO and ZnSO4may be lethal toward aquatic organisms and particulate metals are more lethal than dissolved metals. The water treatment systems, Hwangji and Hamtae had neutral pH values at the FE. The dissolved metals concentrations did not exceed the EC50 values for both species (Table
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