The United States NPDES Construction General Permit defines this phrase as:
A contiguous area where multiple separate and distinct construction activities may be taking place at different times on different schedule under one common plan.
Common Plan of Development Example 1
A company has acquired 4 parcels. Even though each individual parcel is less than 1 acre, the entire disturbed acreage will be approximately 2 acres. This project would be classified as a Common Plan of Development, and would need a Maricopa County Stormwater Permit.
Common Plan of Development Example 2
A company has acquired 5 parcels that are each less than one acre, but combined have a total disturbed acreage of approximately 3.35. The company has decided to develop and sell one parcel at a time before moving onto the next parcel. This project would be classified as a Common Plan of Development and would need a Maricopa County Stormwater Permit.
Note: In our program we are concerned about the total amount of soil being disturbed over an entire project. Developing one parcel at a time does not change the total amount of soil being disturbed.