The study carried out with the parent compound showed that the degradation of trichlorfon in soil is pH dependent. No information regarding to the percent of the metabolites at pH 7 and pH 5 is given in the report. However, accumulation of desmethyl dichlorvos and an unknown metabolite, proposed to be dichlorvinyl phosphate seems to occur at pH 5 as the table 4 given in the page 5 of the Document M shows. Thus, 37.55% TAR was identified as desmethyl-dichlorvos in a sandy loam and 40.68% as dichlorvinylphosphate in a high organic silt loam, no reaching a plateau at the end of the study. Dichlorvos was not detected in this study. The notifier proposes that trichlorfon degrades to desmethyl dichlorvos by two routes by the desmethylation of the parent and also by DDVP via at pH 7, acting Dichlorvos as an intermediate in the degradation of trichlorfon. In the degradation study carried out with DDVP no accumulation of desmethyl Dichlorvos was seen. This might be because of the pH of water used in the study is neutral, but this information is not given in the report.