18E.90.050 Buffer Requirements.
A. Determining Buffer Widths.
1. The buffer width shall be measured on a horizontal plane from a perpendicular line established at the edge of the fault rupture hazard area limits. (See Figure 18E.90-3 in Chapter 18E.120 PCC.)
2. A buffer is an area that is adjacent to a fault rupture hazard area that may be potentially subject to ground surface displacement in a future earthquake. No development shall be permitted within a fault rupture hazard area and its associated buffer. The required buffer width is the greater amount of the following distances:
a. Fifty feet from all edges of a fault rupture hazard area, except for high occupancy or essential facilities, where the minimum buffer distance shall be 100 feet; or
b. The required buffer width is the minimum distance recommended by the geotechnical professional(s).
B. Modification of Buffer Widths. The Department may require a larger buffer width than the buffer distance, as determined in A. above, if the Department determines the standard or proposed buffer is not adequate to protect the health, safety, or welfare of any proposed development.