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The herbicide 2,4 - D was detected at all five sites within the Stony Brook/Millstone Creek Watershed. Highest levels of 2,4 - D were found at Site 1 (Stony Creek) and Site 4 (Carnagie Lake tributary). Investigators feel this is due to regular herbicidal usage within community parks and residential areas. Lower levels of 2,4 -D detected in Lake Carnegie may be caused by increased sedimentation. Water flow from Site 1 through Site 2 to Site 5 is evident by the decreasing quantity of 2,4 -D detected. It is further noted the percolation of 2,4-D through the sandy soil of the Stony Brook/Millstone Creek Watershed occurred even though precipitation was minimal. The recorded levels (>20ppb) of surface water contamination are well above EPA standards(<70ppm) for drinking water. Since the removal of 2,4-D can be accomplished using charcoal filtration it is recommended that persons not associated with the municipal water system should investigate methods of filtering 2,4-D from their ground water supply.