1. Soil Survey of Pierce County Area, Washington, 1979, Soil Conservation Service, United States Department of Agriculture (USDA);

2. Soil Survey of Snoqualmie Pass Area, Parts of King and Pierce Counties, Washington, United States Department of Agriculture, Soil Conservation Service, December 1992;

3. National Wetland Inventory Maps, U.S. Department of Interior, Fish and Wildlife Service, 1973;

4. FEMA FIRM Maps and Flood Insurance Study;

5. Aerial photographs, Department of Natural Resources, 1985 (Assessor's Office aerials);

6. Ongoing field investigation to categorize and delineate wetlands; and

7. Buildable Lands Wetland Inventory, 2001.

1. Soil Survey of Pierce County Area, Washington, 1979, Soil Conservation Service, United States Department of Agriculture (USDA);

2. Soil Survey of Snoqualmie Pass Area, Parts of King and Pierce Counties, Washington, United States Department of Agriculture, Soil Conservation Service, December 1992;

3. Areas designated as slumps, earthflows, mudflows, lahars, or landslides on maps published by the United States Geological Survey or Washington Department of Natural Resources Division of Geology and Earth Resources;

4. Pierce County topographic data;

5. United States Geologic Survey Quadrangle maps;

6. Coastal Zone Atlas of Washington, Volume VII, Pierce County, Washington Department of Ecology;

7. Applicant supplied and verified data of active landslide areas and potentially unstable areas; and

8. Buildable Lands Slope Data, 2001.

1. Washington State Department of Natural Resources Division of Geology and Earth Resources 1-100,000 Scale Digital Geology of Washington State; and

2. Areas designated as faults or subject to liquefaction or dynamic settlement on maps or data published by the United States Geological Survey or Washington Department of Natural Resources Division of Geology and Earth Resources;

3. Washington State Department of Natural Resources Division of Geology and Earth Resources 1-100,000 Scale Digital Geology: Liquefaction Susceptibility of the Greater Tacoma Urban Area, Pierce and King Counties, Washington; Sumner 7.5 Minute Quadrangle, Washington; and the Auburn and Poverty Bay 7.5 Minute Quadrangles, Washington; and

4. Liquefaction Hazard Ranking by S.P. Palmer, Ph.D., L.E.G., based on Youd and Hoose (1977) and Youd and Perkins (1978).

1. The Washington Department of Natural Resources, Division of Geology and Earth Resources, Washington State Coal Mine Cap Collection, Open File Report 94-7, June 1994;

2. Ashford Vicinity Map and Map of Lands of Mashell Coal & Coke Company at Ashford, Washington by Andrew Kennedy as verified by Allan J. Papp, P.E.

3. Washington Geological Survey, Bulletin No. 10, The Coal Fields of Pierce County, Joseph Daniels, 1915; and

4. Maps of Pierce County Coal Mines compiled by Timothy J. Walsh, Chief Geologist, Division of Geology and Earth Resources, Washington Department of Natural Resources.

1. "Map Showing Debris Flows and Debris Avalanches at Mount Rainier, Washington – Historical and Potential Future Inundation Areas," Hydrogeologic Investigations Atlas HA-729, U.S. Dept. of Interior, Geologic Survey, 1995 as amended by Kevin Scott, USGS, on November 10, 1997, to be consistent with the reports listed as 2. and 3. below;

2. Volcano Hazards from Mount Rainier, Washington by Hoblitt, Walder, Driedger, Scott, Pringle, and Valance, U.S. Geological Survey Open File Report 95-273, 1995;

3. Sedimentology, Behavior, and Hazards of Debris Flows at Mount Rainier, Washington, U.S. Geological Survey Professional Paper 1547, 1995;

4. Emergency Action Plan for Nisqually Hydroelectric Project, Federal Energy Regulatory Commission (FERC) Project No. 1862, December 13, 1996, City of Tacoma, Department of Public Utilities, Light Division; and

5. Table of Estimated Lahar Travel Times for Lahars 107 to 108 Cubic Meters in Volume (Approaching a "Case I" Lahar in Magnitude) in the Puyallup River Valley, Mount Rainier, Pierson, T.C., 1998, An empirical method for estimating travel times for wet volcanic mass flows; Bulletin of Volcanology, v. 60, p. 98-109.

1. Commercial Shellfish Harvesting Areas in Puget Sound, Washington Department of Health, was used as a source to identify fish and wildlife habitat areas which are depicted in the Critical Areas Atlas-Fish and Wildlife Habitat Areas-Commercial Shellfish Harvesting Areas Map;

2. Water Type Reference Maps, Washington Department of Natural Resources, were used as sources to identify fish and wildlife habitat areas that are depicted in the Critical Areas Atlas-Fish and Wildlife Habitat Areas-Stream Typing Maps;

3. Natural Heritage Data Base, Washington Department of Natural Resources, was used as a source to identify fish and wildlife habitat areas which are depicted in the Critical Areas Atlas-Fish and Wildlife Habitat Areas-Vascular Plants and Fish and Wildlife Habitat Areas-Animals Maps;

4. Puget Sound Environmental Atlas, Puget Sound Water Quality Authority;

5. Coastal Zone Atlas of Washington, Volume VII, Pierce County, Washington Department of Ecology;

6. Priority Habitats and Species Program and Priority Habitat Species Maps, Washington Department of Fish and Wildlife;

7. Nongame Data Base, Washington Department of Fish and Wildlife;

8. Streamnet Database, Washington Department of Fish and Wildlife;

9. Water Resource Index Areas (WRIA), Washington Department of Fish and Wildlife;

10. Annual Inventory of Commercial and Recreational Shellfish Areas in Puget Sound, Washington State Department of Health, Office of Shellfish Programs;

11. Salmon Distribution Maps, Washington Department of Fish and Wildlife and Washington State Conservation Commission Data, January 2000;

12. Key Peninsula, Gig Harbor, and Islands Watershed Nearshore Salmon Habitat Assessment – Final Report, July 3, 2003, Pentec Environmental;

13. Existing Grasslands and Oak Woodlands in the Puget Lowland and Willamette Valley Ecoregions Database; October 1999, Washington Natural Heritage Program, Washington Department of Natural Resources;

14. Prairie Inventory of Graham Community Plan Area, Graham Community Plan, adopted October 10, 2006;

15. Endangered Species Act-Section 7 Consultation Final Biological Opinion and Magnuson-Stevens Fishery Conservation and Management Act Essential Fish Habitat Consultation issued September 22, 2008.

1. The boundaries of the two highest DRASTIC zones which are rated 180 and above on the DRASTIC index range, as identified in Map of Groundwater Pollution Potential, Pierce County, Washington, National Water Well Association, U.S. Environmental Protection Agency;

2. The Clover/Chambers Creek Aquifer Basin boundary as identified in the Clover/Chambers Creek Basin Groundwater Management Program (TPCHD 1991); and

3. Wellhead protection areas as identified by the Tacoma-Pierce County Health Department.

1. The areas of special flood hazard identified by the Federal Emergency Management Agency in a scientific and engineering report entitled "The Flood Insurance Study for Pierce County and Incorporated Areas" dated March 7, 2017, with accompanying Flood Insurance Rate Maps (FIRM) and any map amendments or corrections issued by FEMA are hereby adopted by reference and declared to be a part of this Title. Pierce County may add or delete land from areas of special flood hazard or revise base flood elevations in accordance with federal regulations.

2. The Flood Insurance Study and Maps provide the base information used in the administration of this Title. The Flood Insurance Study is on file at the Pierce County Planning and Public Works Department, 2401 South 35th Street, Tacoma, Washington; and

3. Where the Flood Insurance Study and FIRM do not provide adequate, best, or most recent information, Pierce County may utilize flood information that is more restrictive or detailed than the FEMA data which can be used for identifying flood hazard areas. This information may include but is not limited to new and more accurate mapping or data on: channel migration, high water elevations from flood events, base flood elevations, groundwater flooding areas, potholes, mapped watercourse, maps showing increased flood inundation based on future build-out or changed hydrologic conditions, specific maps from watershed basin plans or related studies, studies by federal or state agencies, areas secluded from the 2017 FEMA map update because of federal levee accreditation policies, or other information deemed appropriate by the County.

4. Channel Migration Zones (CMZs).