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' 0 Total organic carbon Cyanide <br /> • Carbonate 0 Sulfide <br /> • Bicarbonate 0 Oil and Grease <br /> • Total alkalinity 9 Chemical oxygen demand <br /> • Metals Dissolved oxygen <br /> MONITORING RESULTS <br /> ' GROUNDWATER <br /> ' Groundwater monitoring data for the first quarter of 2000 is presented in Table 1. Appendix E <br /> contains a tabular summary of the historical monitoring data. Concentration limits were updated this <br /> quarter, and monitoring results were compared to the limits presented on Table 1. In several <br /> instances the concentration limits could not be updated because the false positive rate is greater than <br /> 5%. An analysis of variance (ANOVA) test was performed and the results showed a variance in <br /> Chloride in both downgradient wells and in Nitrate in MW-2. There were no significant increasing <br /> trends in these constituents. Since the ANOVA is not a very powerful test, and that there are no <br /> increasing trends the County believes these wells are still unimpacted. <br /> QUARTERLY MONITORING AND FIELD PARAMETERS <br /> A comparison of the quarterly, annual monitoring and field parameter results to the concentration <br /> ' limits in Table 1 shows that there are no exceedences this quarter were concentration limits could <br /> be determined. For the constituents that concentration limits could not be determined,further testing <br /> seems to show that these also are not exceedences. <br /> VOLATILE ORGANIC COMPOUNDS (VOC'S) <br /> rDuring the first quarter monitoring event there were detections of Methylene Chloride in all three <br /> wells. Because of the uniformity of the detections in MW-2 and MW-3, and because Methylene <br /> Chloride is a common laboratory solvent,the County believes these detections to be laboratory error. <br /> ' A trace of Trichloroethene was also detected in MW-3 at an estimated concentration. The well was <br /> not re-tested because the concentration was an estimated value. Further monitoring will determine <br /> ' the presence or absence of this constituent. <br /> Surface Water <br /> ' First storm samples were taken during the first quarter monitoring event. Also, during the first <br /> quarter monitoring event the five year COC's for surface water were analyzed. A tabular summary <br /> of the results can be seen in Table 2. The majority of the COC's could not be statistically analyzed <br /> because there is insufficient background size. The parameters that could be statistically analyzed <br /> were tested with the inter-well tolerance limit and all constituents are within concentration limits. <br /> 6 <br />