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CRA2023-0174 initial determinationCITY OF EDMONDS 121 511 Avenue North, Edmonds WA 98020 Phone: 425.771.0220 • Fax: 425.771.0221 • Web: www.edmondswa PLANNING & DEVELOPMENT DEPARTMENT • PLANNING DIVISION 'nC. 18y1J 12/15/2023 THOMAS WAHL 21708 98TH AVE W EDMONDS, WA 98020-3924 Subject: Critical Areas Determination (CRA2023-0174) Site Address: 21708 98TH AVE W Dear Applicant/Owner, Please find the enclosed critical area determination for the Critical Areas Checklist you submitted to the City of Edmonds Planning Division. The critical area determination for your property is "CRITICAL AREA PRESENT." Note that this determination is a site -specific determination and not a project -specific determination. If the critical area determination is "CRITICAL AREA PRESENT," additional critical areas information or critical areas specific studies may be required for development or alteration of your property depending on the location of the activity. "WAIVER" means no further critical area review is required for development or alteration of your property. If you have any questions regarding this critical area determination, please contact the planner on duty at 425.771.0220. Regards, TRISTAN SEWELL Planning Division Planning & Development Department Enc: Critical Area Determination CITY OF EDMONDS 121 5ch Avenue North, Edmonds WA 98020 Phone: 425.771.0220 • Fax: 425.771.0221 • Web: www.edmondswa.gov PLANNING & DEVELOPMENT DEPARTMENT • PLANNING DIVISION `nc. 1891J Critical Area Determination (CRA2023-0174) Based on a review and inspection of the subject site, staff determined that one or more critical areas are located on or near the site. Critical areas are ecologically sensitive or hazardous areas that are protected to maintain their functions and values. Site Location 21708 98TH AVE W Tax Account Number 27032500110000 Property Owner THOMAS WAHL Applicant THOMAS WAHL Critical Areas) Present ❑ Wetlands (ECDC 23.50): NA ❑ Frequently Flooded Areas (ECDC 23.70): NA ❑ Geologically Hazardous Areas (ECDC 23.80) ❑ Erosion Hazard Areas: Yes ❑ Landslide Hazard Areas: Yes ❑ Seismic Hazard Areas: NA ❑ Fish & Wildlife Habitat Conservation Areas (ECDC 23.90) ❑ Mapped Fish & Wildlife Habitat: NA ❑ Streams: NA Site Description The subject property is located along the west side of 98th Ave. W. and is currently developed with a single-family residence. According to the Soil Survey of Snohomish County, soils on the subject site are Alderwood Gravelly Sandy Loam, 15-25% slopes and Alderwood Urban land complex, 2-8 % slopes. The subject property slopes down from 98th Ave. W to the western boundary, with a significant drop-off supported by various retaining walls on the northern boundary. According to City LiDAR data the site contains slopes greater than 15% which are considered a potential erosion hazard. Additionally, the LiDAR data shows slopes greater than 40 percent with at least a 10-foot change in elevation on the neighboring northern property (21702) which are considered a potential landslide hazard. Buffers may extend on the subject site and thus any land disturbing activity within 50 feet of the steep slope on the neighboring property will require a geotechnical report per requirements of ECDC 23.80, with specific reference to ECDC 23.80.060 and ECDC 23.80.070. An Erosion and Sediment control plan compliant with chapter 18.30 ECDC may be required for development on a site containing an erosion hazard area which may be reviewed as part of a building permit. What does this mean? The critical area regulations are only triggered when an alteration is proposed to a critical area or its buffer. However, once an alteration in or near critical area is proposed, critical area studies and City review and approval may be required. What is an `Alteration'? According to Section 23.40.005 of the Edmonds Community Development Code (ECDC): "Alteration" means any human -induced action which changes the existing conditions of a critical area or its buffer. Alterations include, but are not limited to: grading, filling; dredging; draining; channelizing; cutting, pruning, limbing or topping, clearing, relocating or removing vegetation; applying herbicides or pesticides or any hazardous or toxic substance; discharging pollutants; paving, construction, application of gravel; modifying for surface water management purposes; or any other human activity that changes the existing landforms, vegetation, hydrology, wildlife or wildlife habitat value of critical areas. Unpermitted alteration of a critical area or buffer (including tree trimming or topping, dumping yard waste, or application of pesticides or fertilizers) can lead to enforcement action and fines. Before undertaking any work, please contact the City to verify whether critical area studies and City review is necessary. TRISTAN SEWELL Planner December 15, 2023 Cited sections of the Edmonds Community Development Code (ECDC) can be found at http.-Ilwww.codepublishing.com/WA/Edmonds Environmentally Critical Areas General Provisions (ECDC 23.40) Wetlands (ECDC 23.50) Frequently Flooded Areas (ECDC 23.70) Geologically Hazardous Areas (ECDC 23.80) Fish and Wildlife Habitat Conservation Areas (ECDC 23.90) Building permits — Earth Subsidence and Landslide Hazard Areas (ECDC 19.10) City of Edmonds GIS map tool with approximate location of critical areas: http://maps.edmondswo.gov Page 12 rr 4, City of Edmonds CRA2023-0174 4� W] Q o OP T Os p. ,o N� � � 216061 n L ege d Creeks --'-1fiTH P1 F _ 0' 01 1628 Seismic Hazard Areas �2163� �� Earth Subsidence and Landslide �! Minimum Buffer Adjacent to Hat 1033 1017 �1 21 22-9 21626 Wetlands 1 1 ti 2170 2 Wetlands Boundary — Wetland Boundaries Not Completel LU 1©3 1037 1702 21710 Wetland Known Extents Floodplains A � ® AE = 1041 21708 2 5 12171of VE ® 0 X 1051 925 21716 1 21718 r ArcSDE.GIS.DOH_WELLHEAD_PR Exposed Aquifer —J �I 921 �217' E 14 ■ 21729 21726 r*� 7 . 6 Month . 1 Year 1 SYear E� R3T 110 91 — 18 1 Rn4 111 N 805 21 , 10 Year Buffer Zone 0 Rezones ~ ~� _ PRD 21, 21 • RoW Registered Historic Place ' Contour Lines �,° 121 21 EL1: 1,664 10 O Notes 21708 AVE W 0 138.68 277.4 Feet 2,478 206.5 This map is a user generated static output from an Internet mapping site and is for reference only. Data layers that appear on this map may or may not be accurate, 98TH WGS_1984_Web _Mercator _Auxiliary -Sphere © City of Edmonds current, or otherwise reliable. THIS MAP IS NOT TO BE USED FOR DESIGN OR CONSTRUCTION