Involved in the degradation of the phenoxypropionate herbicides. Catalyzes the enantiospecific cleavage of the ether bond in the herbicid S-dichlorprop ((S)-2-(2,4-dichlorophenoxy)propionate)(S-2,4-DP) and S-mecoprop ((S)-2-(4-chloro-2-methylphenoxy)propionate)(S-2,4-MCPP). It can also accept (RS)-2-(4-chloro-2-methylphenoxy)propionate ((RS)-2,4-MCPP) and phenoxyacetate derivatives such as 2,4-dichlorophenoxyacetate (2,4-D), however it can only accept 2-oxoglutarate as oxygen acceptor. (S)-2-(4-chloro-2-methylphenoxy)propanoate + 2-oxoglutarate + O2 = 2-methyl-4-chlorophenol + CO2 + pyruvate + succinate (S)-(2,4-dichlorophenoxy)propanoate + 2-oxoglutarate + O2 = 2,4-dichlorophenol + CO2 + pyruvate + succinate kcat is 229.7 min(-1) for dioxygenase activity with alpha-ketoglutarate (at pH 6.75 and 30 degrees Celsius). kcat is 284.6 min(-1) for dioxygenase activity with S-2,4-DP (at pH 6.75 and 30 degrees Celsius). kcat is 303 min(-1) for dioxygenase activity with S-2,4-MCPP (at pH 6.75 and 30 degrees Celsius). kcat is 899 min(-1) for dioxygenase activity with (RS)-2,4-MCPP (at pH 6.75 and 30 degrees Celsius). kcat is 1010 min(-1) for dioxygenase activity with S-2,4-MCPP (at pH 6.75 and 30 degrees Celsius). Optimum pH is about 6.5. Optimum temperature is between 35 and 40 degrees Celsius. Xenobiotic degradation; 2-(2,4-dichlorophenoxy)propanoate degradation. Monomer. Belongs to the TfdA dioxygenase family.