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Operators of wastewater facilities shall establish service and operating instructions tailored to their respective circumstances in order to adhere to the requirements especially of§57 of the German Water Resources Management Law (WHG) and in order to meet the minimum requirements of the self-inspection or self-monitoring ordinances of Germany's federal states. Since the regulatory content of the service instructions for all types of wastewater facilities is predominantly indentical, Part 1 of this Standard is valid for the sewerage system including rainwater treatment facilities as well as for pumping stations and for wastewater treatment plants.