4704 HARBOR LN 2018-01-02 MF Import

• Engin•anlConsukants lob 12� , To: Chris & Todd Chase / Everett, WA n;- From: Frank Pita, PE / Geotechnical & Civil Engineer RE: Geotechnical / Civil Engineering Comments / Concerns After Visiting the Chase Lots that are Adjacent to 4704 Harbor Lane, Everett, WA To prepare this letter, I visited the site and walked (crawled) over the landslide debris. In my office, I reviewed the following: • A geotechnical Engineering Evaluation/Anderson Landslide Repairs/4704 Harbor Lane, Everett, WA Report by Nelson Associates (15Sep09 / NGA File No. 816909); • A July 17, 2009, letter to Fredric & Holly Anderson from the Everett Planning and Community Development Department's Gerry Ervine, the land use manager; • A 16Sepu9 letter rum Jamie Jensen, Attorney, to John Dippold of Carney Badley Spellman and David Hall, Deputy City Attorney of Everett; • A survey property map of lots 48 & 49, which also shows the extent of the tree cutting, drainage pipes that transgress the property and the extent of the landslide damage relative to the property lines; and • A Restoration Plan for Anderson SFR by Wetland Resources, Inc dated 24Scp09. • A 2Oct09 letter to John Dippold of Carney Badley Spellman from Gerry Ervine, Manager of Everett's Land Use Department. Specific Comments after Reviewing the Geotechnical Report • My observations of the geologic and geotechnical conditions agree with that of the Nelson report. 1 did see the underlying tine grain soil formation and the overlying sandy material. I also observed older and currently stable landslide topographic features that are adjacent to this recent activity. From my experience, all these features are shallow and are typical for steep glacial terrain. • I agree with the Nelson report that the cutting of the trees was probably not the major cause of the slope failure. However, the cause of the failure is not as simple or straight -forward as the Nelson report indicates. For example: o if the trees were there, perhaps the hillside would not have failed. Properly functioning trees remove a considerable amount of water from the soil in a given day and the cut trees were NOT doing that for the 10 days before the landslide; and o why did not the subsurface drainage systems around pool and the house handled the pipeline break problem? They should have been large enough. Could the problem also have been that the pipes, carrying water onto the adjacent Chase lots, were not function properly as well' I thought these pipes carried water to the botionT*Tely, but based on the 1109 1" Avenue, Suite 501, Seattle, Washington 98101 Phone: (206)588.8200 Fax: (206)588.8201 Page i