The sudden death of Richard Allen in 2016 was mourned by his friends and colleagues at Bayer and throughout the crop protection industry.  One of the largest and most quickly put together studies that Richard Allen helped lead at Bayer was a potable well monitoring program in aldicarb use areas in the U.S.  During this study, 1693 samples were collected and analyzed from potable wells located within 300 m of fields treated with aldicarb in the previous four years.  These wells represent nine major use areas located in the Pacific Northwest, California, Texas, Mississippi delta, and the Southeast.  No detectable aldicarb carbamate residues were found in 90.4 percent of the wells; only 10 wells had residues in excess of 1 μg/L, the maximum being 2.9 μg/L, still significantly below the U.S. EPA Health Advisory Limit (HAL) of 10 μg/L.  This study design is an efficient way of assessing actual concentrations of plant protection products and their metabolites in rural drinking water wells.<br/>

Richard Allen, valued colleague and scientist:  Aldicarb potable well monitoring study

254th National Meeting (2017)

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