If pollution such as sheen or odor is detected in the discharge from dewatering, what should the permittee do first?

When pollution such as sheen or odor is detected in the discharge from dewatering, the most appropriate action is to cease operations immediately. This response is crucial because the presence of sheen or odor indicates potential contamination of the water being discharged. Continuing operations in this scenario could lead to further environmental harm and violate water quality standards, potentially resulting in ecological damage and regulatory repercussions.

Ceasing operations allows for a thorough assessment of the discharge and ensures that any pollutants are contained rather than allowed to enter nearby water bodies or impact the local ecosystem. This action is consistent with best management practices in stormwater management, which prioritizes protecting water quality and public health above all else.

Other options, such as notifying the local community or allowing the discharge to settle, may be necessary steps later on but do not address the immediate concern of potentially harmful pollutants being released into the environment. Continuing operations in the face of pollution could exacerbate the situation and lead to greater violations and responsibilities.