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t <br /> Surface water samples also are to be analyzed for the following constituents of concern (COCs) <br /> every 5 years. <br /> • Total organic carbon • Cyanide <br /> • Carbonate 0 Sulfide <br /> • Bicarbonate • Oil and Grease <br /> • Total alkalinity • Chemical oxygen demand <br /> • Metals 0 Dissolved oxygen <br /> MONITORING RESULTS <br /> GROUNDWATER <br /> Groundwater monitoring data for the third quarter of 1999 are 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 was performed on these constituents and it showed a significant <br /> difference between the upgradient and downgradient wells. But there were no significant increasing <br /> trends and the values of the downgradient wells were found to be significantly lower than the <br /> upgradient well. <br /> QUARTERLY ITOI AND FIELD PARAMETERS <br /> A comparison of the quarterly monitoring and field parameter results to the concentration limits in <br /> Table 1 shows that there are no exceedances this quarter. <br /> VOLATILE ORGANIC COMPOUNDS (VOC'S) <br /> Six VOC's were detected during the first quarter 1999 monitoring event. Due to the uniformity of <br /> the concentrations, and their relation to laboratory matrix spikes,the County believed these results <br /> to be inaccurate due to laboratory error. MW-3 was resampled as a part of second quarter <br /> monitoring, and the results show non-detectable levels of all VOC's. The County believes that the <br /> first quarter results were in error and that landfill impact has not been verified. For the third quarter <br /> monitoring event Chlorobenzene has been detected in MW-1 and MW-2 in almost exact <br /> concentrations. Because the concentrations are almost the same,and that Chlorobenzene is used for <br /> quality control as a spike, the county believes that these detections may be due to laboratory error. <br /> Nonetheless,the County has resampled both of the wells and will submit a report of the findings of <br /> the retest as soon as results are available. <br /> Surface Water <br /> First storm samples were taken during the first quarter monitoring event. During the third quarter <br /> monitoring event there was no water present for sampling. <br /> 6 <br />