1. The Pierce County Critical Areas Atlas-Erosion Hazard Area Map provides an indication of where potential erosion hazard areas are located within the County. The actual presence or location of an erosion hazard area and/or additional potential erosion hazard area that have not been mapped, but may be present on or adjacent to a site, shall be determined using the procedures and criteria established in this Chapter.

2. The Department will complete a review of the Critical Areas Atlas-Erosion Hazard Area Map, and any other source documents for any proposed regulated activity to determine whether the site for the regulated activity is located within a potential erosion hazard area.

3. When the Department's maps, sources, or field investigations indicate that the site for a proposed regulated activity is located within a potential marine shoreline erosion hazard area, the Department shall require a geological assessment as outlined in PCC 18E.110.030 B. below. (See Figure 18E.110-2 in Chapter 18E.120 PCC.)

4. When the Department's maps, sources, or field investigations indicate that the proposed project area for a regulated activity is located within a riverine erosion hazard area (channel migration zone). The standards set forth in Chapter 18E.70 PCC shall apply to riverine erosion hazard areas (channel migration zones).

5. When the Department's maps, sources, or field investigations indicate that the proposed project area for a regulated activity is located within a potential soil erosion hazard area, the Department shall require submittal of an erosion control plan pursuant to the requirements set forth in Title 17A PCC, Construction and Infrastructure Regulations – Site Development and Stormwater Drainage.

6. Applicants requesting to develop a bulkhead along a freshwater or marine shoreline shall be required to submit a geotechnical report. The geotechnical report shall comply with the requirements established in 18E.110.060 – Appendix C.

7. Unless otherwise stated in this Chapter the critical area protective measure provisions contained in PCC 18E.10.080 shall apply.

1. Geological assessments shall be submitted to the Department for review and approval together with a shoreline erosion hazard area application.

2. All geological assessments shall address the minimum requirements specified in Appendix A, B, or C, as applicable. The applicable assessment shall also include all supportive documentation for review including, but not limited to: 10-year and 120-year regression calculation data, historical mapping/air photos, published data and references, etc.

3. Geological assessments shall be prepared, signed, and dated by a geotechnical professional (as defined in PCC 18E.10.060 and established in this Chapter) and the format shall be pre-approved by the Department.

4. A geotechnical professional shall complete a field investigation and geological assessment to evaluate whether or not an active shoreline erosion hazard area exists within 200 feet of the site. (See Figure 18E.110-2 in Chapter 18E.120 PCC.)

5. The Department shall review the geological assessment and either:

6. A geological assessment for a specific site may be valid for a period of up to five years when the proposed land use activity and site conditions are unchanged. However, if surface and/or subsurface conditions associated with the site change during that five-year period, the applicant may be required to submit an amendment to the geological assessment.