Powys county councillors are to be asked to approve "minor" changes to planning permission for the Abermule bulk recycling facility and business park, despite concerns over contamination on the site, including asbestos.
The community council saying the amendments should not be approved.
Powys County Council has submitted an "application for a non-material amendment to permission" to alter the wording of an application for outline permission on the site.
The amendments concern conditions that the site "will not qualify as 'contaminated land'" under an environmental protection act and a Welsh Government contaminated land regulation.
The community council states: "If approved it will permit workers and development to proceed on contaminated land before any recommendation to render the site safe has been carried out.
"Indeed it will allow development to proceed to proceed even before a proposed scheme to render the site safe has been prepared and approved in writing by the LPA. This is wholly unsatisfactory position on health and safety grounds alone and therefore this application should not be approved."
The council's contaminated land officer states they are satisfied with the proposals.
The changes relate to wording about the timescale and other factors that workers and others can begin work on the site.
The planning officer says in a report to councillors: "The applicant has stated in their submission that this amendment is required in order to enable appointed contractors to prepare appropriate documentation and undertake asbestos removal in accordance with relevant legislation and guidance."
It adds: "The proposed amendment relates to the amendment of the approved conditions to provide an altered timeframe for the submission and implementation of a remediation scheme."
The recommendation to councillors states: "Whilst the comments from the third party and Community Council are noted, in light of the above and following comments from Contaminated Land Officer, Officers consider that the proposed development remains in accordance with the listed planning policies. Due to the nature of the proposed alterations, it is considered that the amendments do not materially alter the approved scheme."
Councillors will consider the application on Thursday.