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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 Sulfide <br /> • Bicarbonate Oil and Grease <br /> • Total alkalinity Chemical oxygen demand <br /> ' 9 Metals Dissolved oxygen <br /> ' MONITORING RESULTS <br /> GROUNDWATER <br /> Groundwater monitoring data for the fourth quarter of 2000 is presented in Table 1. Appendix E <br /> contains a tabular summary of the historical monitoring data. Concentration limits were updated <br /> this quarter, and monitoring results were compared to the limits presented in Table 1. In several <br /> instances the concentration limits could not be updated because the false positive rate is greater <br /> than 5%. An analysis of variance (ANOVA) test was performed and the results showed a <br /> variance in Chloride, EC and Nitrate in MW-3 and EC and Nitrate in MW-2. There were no <br /> significant increasing trends in these constituents. The ANOVA is not a very powerful test, and <br /> there are no increasing trends, so the County believes these wells are still unimpacted. <br /> QUARTERLY MONITORING AND FIELD PARAMETERS <br /> A comparison of the quarterly field parameter results to the concentration limits in Table 1 <br /> shows that there are no exceedences this quarter where concentration limits could be determined. <br /> As for the constituents that concentration limits could not be determined, further testing seems to <br /> show that these are also not exceedences. <br /> VOLATILE ORGANIC COMPOUNDS(VOC'S) <br /> During the fourth quarter monitoring event 1,1-Dichloroethene, and Trichloroethene were <br /> detected in MW-3. Detections of 1,1-Dichloroethene and Trichloroethene in MW-3 have both <br /> ' occurred in the past. The County has started the evaluation monitoring program prescribed by <br /> the Regional Board. The County is awaiting a response to the proposed Evaluation Monitoring <br /> Plan dated November 24, 2000. Meanwhile,the County will continue to sample and evaluate <br /> MW-3 for VOC's. <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. During the <br /> ' fourth quarter monitoring event,no water was present for sampling. <br /> 6 <br />