1209 MADRONA AVE 2016-10-05 - Laserfiche WebLink

Geotechnical Engineering Evaluation NGA File No. 870113 Packer Property March 11,2013 Retaining Walls and Steep Slope Evaluation Page 14 Everett,Washington (Symphoricarpos albus), Nootka rose (Rosa nutkana), Ocean Spray (Holodiscus discolor), and Oregon- grape (_-Manhonia nervosa). We should be retained to review and comment on the slope vegetation plan. The homeowners should be able to come up with the re-vegetation plan, but NGA should be retained to review such plan prior to implementation. The actual need/extent of the erosion control matting should be evaluated by NGA after the wall is installed. Failing Wall Repairs The section of the existing wall that has failed but not related to the slope failure should be repaired by placing the blocks on a concrete leveling pad and backfilling the wall with clean crushed rock. Some of the slumping soils in this area should be additionally over-excavated and replaced with the crushed rock backfill. These repairs should be completed prior to installing the retaining wall in the slide area. NGA should approve the repairs during construction. USE OF THIS REPORT NGA has prepared this report for Robert and Heidi Packer and their agents for use in the planning and budgeting of the repairs on this site only. The scope of our work does not include services related to construction safety precautions and our recommendations are not intended to direct the contractors' methods, techniques, sequences, or procedures, except as specifically described in our report for consideration in design. There are possible variations in subsurface conditions between the explorations and also with time. Our report, conclusions, and interpretations should not be construed as a warranty of subsurface conditions. A contingency for unanticipated conditions should be included in the budget and schedule. All people who own or occupy homes on hillsides should realize that landslide movements are always a possibility. The landowner should periodically inspect the slope, especially after a winter storm. If distress is evident, a geotechnical engineer should be contacted for advice on remedial/preventative measures. The probability that landsliding will occur is substantially reduced by the proper maintenance of drainage control measures at the site. Therefore, the homeowner should take responsibility for performing such maintenance. Consequently,we recommend that a copy of our report be provided to any future homeowners of the property if the home is sold. NELSON GEOTECHNICAL ASSOCIATES, INC.