20180726151551.pdf.............................
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June 26, 2018
civil & structural
engineering & planning
Steven Wright, Geotechnical Peer Review
City of Edmonds, Planning Division
121 5th Avenue N
Edmonds, WA 98020
RE: Plan Check:
Project Name:
Project Address
Dear Mr. Wright,
BLD2018-0517
Larsen Single Family Residence
15729 75th PI W
Itemized below is our response to the engineering review comments in the April 30, 2018 letter for the
above referenced project. Our response appears in bold.
GEOTECHNICAL REPORT
• The vicinity map does not identify existing conditions such as known landslide masses,
debris flows, or mud flows on or near the site.
The vicinity map has been updated on S0.1 to show the know slide area. Also refer to the
response by Nelson Geotechnical dated 7/25/18.
• The topographic survey does not show distances to existing habitable structures on or
near the site, as required in ECDC 19.10.030(D).
Distanced have been added to the site plan. Please refer to 50.1.
• The applicant did not submit a separate topographical drawing showing proposed
grade contours at 2-foot intervals, as required in ECDC 19 . 10 .0 3 0 (E.7).
All work is within the footprint of the existing building. The grading will not change.
• The geotechnical report, dated February 28, 2018 by Nelson Geotechnical Associates does
not provide analysis of the rate of retreat of the bluff nor an estimate of the percent risk of
landslide area expansion that recognizes and reflects potential catastrophic events such as
seismic activity or a 100-year storm event, as required in ECDC 19.10.030(H.6) and ECDC
23.80.050(F.2.e).
Please refer to the response by Nelson Geotechnical dated 7/25/18.
• The geotechnical report, dated February 28, 2018 by Nelson Geotechnical Associates does
not describe public and private sewage disposal systems, as required in ECDC
23.80.050(F.2.c).
Please refer to the response by Nelson Geotechnical dated 7/25/18.
250 4th Avenue South, Suite 200
Edmonds, WA 98020
ph.425.778.8500 1 f.425.778.5536
www.cgengineering.com
Larsen 3 Lot Short Plat 17145.10 July 26, 2018
Comment Response — Building Page 2 of 2
0 The geotechnical report, dated February 28, 2018 by Nelson Geotechnical Associates does
not consider the run -out hazard of landslide debris and/or the impacts of landslide run -out
on downslope properties, as required in ECDC 23.80.050(F.2.f).
Please refer to the response by Nelson Geotechnical dated 7/25/18.
o The geotechnical report, dated February 28, 2018 by Nelson Geotechnical Associates does
not adequately assess the stability of the slope, as required in ECDC 23.80.050(F.2.g). The
geotechnical engineer should confirm the stability of the slope through modeling or
numerical analysis and present the results in the geotechnical report.
Please refer to the response by Nelson Geotechnical dated 7/25/18.
The applicant did not submit documentation of required bonds, frozen funds, or adequate
instrument of credit, nor did they submit a copy of the contractor's general public liability
insurance, as required by ECDC 19.10.030(J).
Bond issues will be addressed with the City of Edmonds.
If you have any questions or comments regarding the responses to this review, please do not hesitate to
call.
Sincerely,
CG Engineering
Dennis Titus, PE, SE
Project Manager
250 4th Avenue South, Suite 200
C Edmonds, WA 98020
RlllwiCa ph.425.778.8500 1 f.425.778.5536
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www.cgengineering.com