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aalrza. sacs <br />Vaga6of6 <br />LmIlteoGeotechniyml lwal"tion <br />Conclusions & Recommendations <br />It is our opinion that the recent vegetation modifications bave not adversely affected geologic <br />hazards on the site or adjacent areas. We recommend that all areas remain fully vegetated. The <br />affected areas us stable at this time with no evidence of historic or recent landslide activity or and <br />erosion. <br />We note thatthere is a mappedhistoric landslide northwest of the shallow ravine where the weak <br />took place. There will always be a risk of landslide activity on this slope due to the presence of <br />very steep topography, pre-existing instability due to the historic slide activity, and potential for <br />spring activity, seasonal stream incision, and ongoing retreat and oversteepening due to emaion <br />and mass wasting. <br />Removal of specific Gees, blackberry vines, and other invasive plantsfunderstory sent of the <br />hazard areas are suitable provided areas are re -vegetated with native species and other <br />vegetation. Under no circumstances should bare soils be present except for short period in which <br />work is ongom& We understand that grasses, salal, ferns, and similar low-lying vegetation will be <br />utilized. No additional mitigation is necessary. <br />We understand that future construction may include a garage expansion near the residence along <br />with paving existing gravel driveway areas near the residence. These areas are not within <br />geologically hazardous areas and appear to be suitable/feasible provided erosion control <br />measures are in place until completed, work is properly permitted, and runoff is controlled per <br />plan. This workean be completed without adversely affectingnearby critical areas. <br />Closure <br />The information presented herein is based upon professional interpretation utilizing standard <br />practices and a degree of conservatism deemed proper for this project. We emphasize that this <br />report is valid for this project as outlined above and for the current site conditions and should not <br />be used for any other site. <br />Sincerely, <br />Cobalt Geaciences, LLC <br />'1/llfto29 <br />Phil Haberman, PE, LG, LEG <br />Principal <br />PFl/se <br />Attachments <br />h IMen rmn <br />(206) 331-1097 <br />