|
GeoTest Services, Inc.—Revision 1 April 10, 2020
<br /> Kikuchi Retaining Wall, Everett, Washington Project No. 20-0344
<br /> Aerial Photo Review
<br /> We reviewed historic and recent aerial photos of the subject property from 1977 to 2019 in order
<br /> to determine if there has been any significant slide activity within the vicinity of the project site.
<br /> Aerial photos were obtained from the Coastal Zone Atlas and the Snohomish County PDS Map
<br /> Portal.
<br /> Our review indicates that the subject property has remained largely unchanged over the duration
<br /> of the reviewed imagery. Notably,the steep slopes in the central portion of the subject property
<br /> have remained covered with grasses and vegetation. Commonly, slope failures will leave
<br /> geomorphic scars on slopes that can be identified in aerial imagery as an absence in vegetation.
<br /> There do not appear to be any signs of large-scale "global" instability on the subject slope in the
<br /> reviewed aerial photos. Similarly, GeoTest did not observe indications of instability on slopes
<br /> adjacent to the subject property. Please note that the aerial photos may not fully depict actual
<br /> surface conditions due to the tree canopy and/or other vegetation possibly obscuring the ground
<br /> surface.
<br /> iP '' ''',,,,.;.. .,.., . ./;,,,,,4,..., ....,:,- '31e1)....sh...-.04
<br /> liii ''''; s. -. ‘ '4t '" i5 - 1(91;sl
<br /> - * 'N. "" • (.411,...,- - ..=, : , -1..‹.;:, - ,-_ ok ,
<br /> , , ,\ _,, . . ... ._
<br /> •
<br /> FRS w.. A.. _ . 4., y ,
<br /> ,it •:..k):'-
<br /> 4, _ » ... 4 :: ' 'iit ,'D ' '... ? :-
<br /> i P \II 1 :k f. ' '4'-'7''' ' '-*:1;411,,-41 t t%, --
<br /> image 3.1977 aerial image of the subject property.Photo taken from Coastal Zone Atlas.Approximate subject property boundary
<br /> outlined in red.
<br /> Bare Earth Imagery Review
<br /> GeoTest reviewed bare earth imagery, acquired in 2017, of the subject property, site vicinity and
<br /> subject slope. Based on our review, the site and subject slope did not display typical indications
<br /> of slope stability such as tension cracks, head scarps, or hummocky terrain at the base of the
<br /> slope.
<br /> 8
<br />
|