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CA-08-0034 Erosion-Landslide.pdf CITY OF EDMONDS CRITICAL AREAS RECONNAISSANCE REPORT th Site Location: 16117 74 Place West Tax Acct. Number: 00544600001200 Determination: Study Required Determination #: CRA-2008-0034 Applicant: Stephen Johnson Owner: Kristin Hansen CRITICAL AREAS RECONNAISSANCE REPORT: STUDY REQUIRED During review and inspection of the subject site, it was found that the site contains and/or is adjacent to critical areas, including Geologically Hazardous Areas, pursuant to Chapters 23.40 and 23.80 of the Edmonds Community Development Code (ECDC). Part of the Lorian Woods Planned Residential Development (PRD-1989-1), the subject parcel slopes east-west at approximately 35%, according to the City’s LIDAR data. This qualifies as an erosion hazard. There is a small area adjacent to the northeast corner of the parcel with slopes in excess of 40%, which qualifies as a potential landslide hazard. GENERAL CRITICAL AREAS REPORT REQUIREMENTS Critical Areas Reports identify, classify, and delineate any areas on or adjacent to the subject property that may qualify as critical areas. They also assess these areas and identify any potential impacts resulting from your specific development proposal. If a specific development proposal results in an alteration to a critical area, the critical areas report will also contain a mitigation plan. You have the option of completing the portion of the study that classifies and delineates the critical areas and waiting until you have a specific development proposal to complete the study. You may also choose to submit the entire study with your specific development application. Please review the minimum report requirements for all types of Critical Areas that are listed · in ECDC 23.40.090.D. There are additional report requirements for different types of critical areas (see below). Note that it is important for the report to be prepared by a qualified professional as defined · in the ordinance. There are options on how to complete a critical areas study, and there is an approved list of consultants that you may choose from. You may contact the Planning Division for more information. General Mitigation Requirements for all Critical Areas are discussed in ECDC 23.40.110 · through 23.40.140. STUDY REQUIREMENT – EROSION HAZARD AREA It appears that this property contains or is adjacent to an Erosion Hazard Area. Erosion Hazard Areas include: Those areas with Alderwood and Everett series soils on slopes of 15 percent or greater. · Any area with slopes of 15 percent or greater and impermeable soils interbedded with · granular soils and springs or ground water seepage. Areas with significant visible evidence of ground water seepage, and which also include · existing landslide deposits regardless of slope. 1 DEVELOPMENT PROPOSALS ASSOCIATED WITH EROSION HAZARD AREAS Development within an Erosion Hazard Area must meet additional criteria. For erosion hazard areas with suitable slope stability, the only critical area study needed is ·· ·· an erosion and sediment control plan prepared in compliance with the requirements set forth in Chapter 18.30 ECDC as part of the construction documents. This option is at the director’s discretion, per Edmonds Community Development Code section 20.80.050.G. In areas where the slope stability is not suitable, projects within Erosion Hazard Areas will · require a report by a licensed Geotechnical Engineer or other qualified professional. Note that it is important for the report to be prepared by a qualified professional as defined in the ordinance. Report requirements are given in ECDC 23.80.050, and more generally in ECDC · 23.40.090.D. Development standards are given in ECDC 23.80.060 and 23.80.070. · STUDY REQUIREMENT – LANDSLIDE HAZARD AREA It appears that this property contains or is adjacent to a Landslide Hazard Area. A Landslide Hazard Area is any area with a slope of forty percent (40%) or steeper and · with a vertical relief of ten (10) or more feet (except areas composed of consolidated bedrock). Landslide Hazard Areas are further defined and illustrated in ECDC 23.80.020.B. · In addition to the general requirements for Critical Areas reports referenced above, specific · Critical Area report requirements for Landslide Hazard Areas are provided in ECDC 23.80.050. DEVELOPMENT PROPOSALS ASSOCIATED WITH LANDSLIDE HAZARD AREAS Development is restricted within a Landslide Hazard Area and its buffer. Projects that will intrude into these areas will require a report by a licensed Geotechnical · Engineer. The criteria that are applied depend on the amount that the buffer is reduced. · The buffer can be reduced to a minimum of ten (10) feet (with an additional 15’ building · setback per ECDC 23.40.280) if a report is prepared that meets the standards listed in ECDC 23.80.050. The alteration must also meet the requirements listed in ECDC 23.80.060. In addition, proposals to reduce the buffer to less than ten (10) feet must comply with the · design standards listed in ECDC 23.80.070.A.3. ALLOWED ACTIVITIES Certain activities are allowed in or near critical area buffers as specified in ECDC 23.40.20. If you have any questions about whether your proposed development qualifies as an allowed activity, please contact a Planner for more information. 2 EXEMPT DEVELOPMENT PROPOSALS Certain development proposals may be exempt from Critical Areas Requirements (ECDC 23.40.230). If you think that a specific development proposal may be exempt, contact a Planner for more information. Michael Clugston, Planner April 15, 2008 Name Signature Date NOTE: Cited sections of the Edmonds Community Development Code (ECDC) can be found on the City of Edmonds website at www.ci.edmonds.wa.us. 3