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The Zone-Log Rolls should extend a minimum of 6 feet in all directions when not part of a composite structure. This is because Zone-Log Rolls are designed to provide effective control of water runoff and prevent soil erosion. A longer extension of 9 or 12 feet would be unnecessary and may not be feasible in certain areas, while a shorter extension of 3 feet would not provide adequate coverage and could result in erosion outside of the designated area. Therefore, 6 feet is the optimal distance for Zone-Log Rolls to effectively fulfill their purpose.