In the earlier version, wastewater and sludge sampling were conducted based on a mutual agreement between the facility and the ZDHC Approved Wastewater Laboratory.. However, once the new version of the ZDHC Wastewater and Sludge Guidelines V2 is implemented, the sampling will be carried out in a semi-announced method. Details regarding this are mentioned in the ZDHC Wastewater and Sludge Guidelines Laboratory Sampling and Analysis Plan V3.0, as well as ZDHC Wastewater and Sludge Guidelines V2.