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0291 <br />Examination of the pesticide data reveals that three different pesticides were <br />detected in the Arkansas River Valley alluvial aquifer. In twelve (12) of the one hundred <br />thirty nine (139) wells sampled the herbicide Atrazine was detected. The detection limit of the <br />laboratory analysis is 0.5 ug/l or ppb. One well contained the herbicides Metolachlor and <br />Atrazine at the trace level. One other well detected the herbicide 2,4 -D also at the trace level. <br />No well contained a pesticide at a level higher than the EPA drinking water standard. The <br />location of the pesticide detections are plotted in Figure 4. <br />The WQCD intends to include, in the final analysis of the Arkansas River Valley <br />alluvial aquifer, all available ground water quality data. Results from previous and ongoing <br />studies by other agencies in the area will be integrated into this analysis. <br />TABLE 2 - Results of Pesticide Analysis, Arkansas Valley Aquifer, 1994. <br />Amounts are given in micrograms per liter (ug /L). Units of measurement for pesticide <br />concentrations. In water, equivalent to parts per billion. <br />DL - Minimum concentration that can be detected by the laboratory <br />MCL - the maximum amount allowed in drinking water <br />I <br />N. <br />Pesticide <br />Use <br />No. Detections <br />DL <br />MCL <br />Atrazine <br />Herbicide <br />12 <br />0.05 <br />3.0 <br />Metolachlor <br />Herbicide <br />1 <br />0.05 <br />100 <br />2 -D <br />Herbicide <br />1 <br />0.02 <br />70 <br />Amounts are given in micrograms per liter (ug /L). Units of measurement for pesticide <br />concentrations. In water, equivalent to parts per billion. <br />DL - Minimum concentration that can be detected by the laboratory <br />MCL - the maximum amount allowed in drinking water <br />I <br />N. <br />