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Surface water samples also are to be analyzed for the following constituents of concern (COCs) every <br /> 5 years. <br /> • Total organic carbon 0 Cyanide <br /> • Carbonate a 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 second 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. <br /> QUARTERLY MONITORING AND FIELD PARAMETERS <br /> A comparison of the quarterly monitoring and field parameter results to the concentration limits in Table <br /> 1 shows that there are no exceedances this quarter. It also needs to be noted that -1 has shown <br /> significant levels of Chloride, Sulfate, and Nitrate-Nitrogen in the past. <br /> VOLATILE ORGANIC COMPOUNDS (VOC'S) <br /> Six VOC's were detected during the first quarter monitoring event. Due to the uniformity of the <br /> concentrations,and their relation to laboratory matrix spikes,the County believed these results to be <br /> inaccurate due to laboratory error. MW-3 was resampled as a part of second quarter monitoring,and the <br /> results show non-detectable levels of all VOC's. The Countybelieves that the first quarter results were <br /> in error and that landfill impact has not been verified. <br /> Surface Water <br /> First storm samples were taken during the first quarter monitoring event. During the second quarter <br /> monitoring event there was no water present for sampling. <br /> GROUNDWATER FLOW DIRECTION <br /> ' Groundwater levels were measured in monitoring wells MW-1,MW-2,and MW-3,on April 1,1999. <br /> Groundwater flow,as shown in figure 3,is inferred to be toward the southwest. The groundwater gradient <br /> is 0.0015 foot per foot,and it was calculated by dividing the difference in elevation between the 50.2 and <br /> 52 foot contours (1.8 feet), and dividing by the measured distance between them(1216.8 feet). <br /> 6 <br />