Human exposure to alachlor may result from activities involving alachlor application, dietary exposure through treated commodities, and through alachlor residues in ground or surface water. The first two sources are not part of this evaluation, although the magnitude of dietary exposure could have an impact on the PHG estimate if adequate data exist to determine exposures from diet and from drinking water. In the absence of such data, exposure from alachlor from drinking water (occupational exposure is not taken into account) would be assumed to constitute 20% of the total exposure to the chemical.