What Types of Construction Activities May Need a Stormwater Permit?
Any construction activity that will, or is part of a “common plan” of development or sale that will, disturb one or more acres must either have a permit OR have qualified for a waiver. These regulated discharges are broken into two categories: “Large” and “Small”. A large construction activity is one that will disturb, or is part of a “common plan” that will cumulatively disturb, five or more acres. A small construction activity is one that will disturb, or is part of a “common plan” that will cumulatively disturb, one or more acres. Construction and construction-related activities refer to the actual earth disturbing construction activities and those activities supporting the construction project such as construction materials or equipment storage or maintenance (e.g., fill piles, borrow area, concrete truck washout, fueling), measures used to control the quality for stormwater associated with construction activity, or other industrial stormwater directly related to the construction p