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<br />,. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />1400 <br /> <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 MetolacWor 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 EP A drinking water standard, The <br />location of the pesticide detections are plotted in Figure 4. <br /> <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 /> <br />TABLE 2 - Results of Pesticide Analysis, Arkansas Valley Aquifer, 1994. <br /> <br />Pesticide <br /> <br />Use No. Detections <br /> <br />DL <br /> <br />MCL <br /> <br />Atrazine <br />Metolachlor <br />24-D <br />, <br /> <br />Herbicide 12 <br />Herbicide 1 <br />Herbicide 1 <br /> <br />0.05 <br />0.05 <br />0.02 <br /> <br />3.0 <br />100 <br />70 <br /> <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 /> <br /> <br />8 <br /> <br />I ~ <br />