75-5-319. Compliance schedule for base numeric nutrient standards. If the United States environmental protection agency vetoes or objects to a discharge permit because of a nutrient standards variance provided for in 75-5-313 and the environmental protection agency determines that no variance may be granted for the permit, the department shall modify the discharge permit to contain nutrient limits based on the base numeric nutrient standards and a compliance schedule for meeting these nutrient limits. The compliance schedule may not extend for more than 20 years. The department may review and modify the compliance schedule every 3 years.