In the new version of the ZDHC Wastewater and Sludge Guidelines V2 Benzene, Toulene, Xylene, m-cresol, o-cresol, p-cresol are now listed under a new ZDHC MRSL Group Organic Solvents.m-cresol, o-cresol, p-cresol which were earlier reported as an individual parameters will now be reported as sum of o,m,p-cresol with an reporting limit of 1 ppb