1. If the country where the site is located has no specific regulation on labour issues, the legal framework to be considered on the assessment should be ILO conventions, other international standards and the ProTerra Standard Version 4.1.
As an auditor I would try to obtain evidence of these labor claims, if they really exist. If they do exist, how serious these claims are, what is their current status, what measures have been taken by the company, cross-check information between the unit and the workers through visual observation and interviews, considering that the absence of slave and forced labour, child labour and forms of modern slavery, weekly working hours and overtime and Equal opportunities and treatment for workers, etc are considered core indicators, which are essential and must be met by applicants to be granted the ProTerra Standard certification.
2. In my opinion the two most relevant contributions to the SDGs delivered by a ProTerra certification are:
Principle #2: Human Rights and responsible labour policies and practices, which has several indicators that directly impact to the SDG #8 “Promote inclusive and sustainable economic growth, employment and decent work for all” ProTerra enforces ILO conventions to ensure that certified organisations provide safe working environments and do not engage with forced labour, irresponsible recruitments practices and discriminatory behaviour.
Principle #7: Water management, which has several indicators that directly impact to the SDG #6 “Ensure access to water and sanitation for all”. Considering that water scarcity, poor water quality and inadequate sanitation negatively impact food security, livelihood choices and educational opportunities for poor families across the world and approximately 70% of all water abstracted from rivers, lake and aquifers is used for irrigation and more than 80% of wastewater resulting from human activities is discharged into rivers or sea without any pollution removal.