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Surface water samples are to be analyzed for the following quarterly monitoring and field <br /> parameters: <br /> • Temperature <br /> • Electrical conductivity <br /> • pH <br /> • Turbidity <br /> • TDS <br /> • Chloride <br /> Surface water samples are to be analyzed annually for the following additional parameters: <br /> • Sulfates <br /> • Nitrate -Nitrogen <br /> • Total Kjeldahl Nitrogen <br /> • Chemical Oxygen Demand <br /> • Dissolved Oxygen <br /> Surface water samples are to be analyzed every 5 years for the following parameters: <br /> • ICP Metals (26 metals) <br /> MONITORING RESULTS <br /> Groundwater <br /> Appendix E contains a tabular summary of the historical monitoring data. The results from the first <br /> quarter of 2000 were compared to the concentration limits shown in Table 1. The HLSL has been <br /> approved to perform intrawell tolerance limits (each well is its own background). Concentration <br /> limits are updated quarterly and were updated again in the first quarter of 2000. In some cases the <br /> concentration limits could not be updated because the false positive rate was greater than 5%. For <br /> these cases a Rank Sum analysis was also performed and the results showed no significant difference <br /> between the compliance data and the background data, or it showed that the compliance data was <br /> significantly lower than the background data. Therefore it can be concluded that these constituents <br /> are not in exceedence. <br /> Review of the first quarter results shows that there is an exceedence in pH in MW-1 and MW-2. In <br /> both cases the value for pH was slightly higher than the established concentration limit. The County <br /> believes this to be a naturally occurring event because leachate contamination would cause the pH <br /> value to drop low out of range rather than high. Therefore, the County does not believe that <br /> resampling the well is warranted. <br /> Statistical analysis of the data revealed a statistically significant increasing trend in Chloride in MW- <br /> 2. Therefore the Tolerance Limit method was not used for this constituent because tolerance limit <br /> testing is not valid when a significantly increasing trend is evident. It should also be noted that <br /> although there is a statistically significant increasing trend, the value for chloride is 16.7 ppm. In <br /> 1987 the detected level of chloride was 11, and over a twelve year period the level has only risen to <br /> a high of 18. The drinking water limit for chloride is 200 ppm, so the concentration of chloride at <br /> 5 <br />