HomeMy WebLinkAboutBLD2006-00052 Geotechnical Report •
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EnviroSound Consulting Geotechnical and Environmental Consulting
May 24, 2012 ESC12-GV013
Page No. 1
Mr. Layne Beller 22208 93rd Place West 1 I C Q V
I
Edmonds, WA. 98020
Subject: Proposed Single-Family Residence I-1' JUL 5 2012
242 Holland Drive(Lot 35) u b J
Sequim,WA. 4
Building Permit#06-00052 JEFFERSON COUNTY
DEPT.OF COMMUNITY DEVELOPMENT
Dear Mr. Beller:
EnviroSound Consulting Inc. (ESC) is pleased to present this letter in response to a request from the
Jefferson County Department of Community Development. ESC staff have previously worked on the site
while employed by others. An ESC representative visited the subject property on May 23, 2012 and met
with you.
ESC reviewed the following documents for the generation of this letter:
• Preliminary Geologic Assessment of Slope Stability by ALKAI Consultants, dated September 10,
2004.
• Retaining Wall Assessment Letter by ALKAI Consultants, dated June 26, 2005.
• Building Plans by Adrian Bratcher Drafting Service, dated May 27, 2011.
At the time of the May 23, 2012 site visit, the single-family residence (SFR) was in the final phases of
construction, as was a storage structure. Access to the site is by an ascending gravel driveway off of
Holland Drive. The subject property (Lot 35) is the only lot currently under development of the three lots
addressed in the 2004 ALKAI report.
The SFR was measured at approximately 22 feet from the top of the front (east) descending slope. The
northwest corner of the SFR was approximately 12 feet from the top of a I.5H:1.0V (horizontal to vertical
ratio) descending slope ranging from 15 to 25 feet in height. There was no visible erosion or sloughing
observed on either of the slope faces at the time of the site visit.
Several discharge points from roof gutters were noted around the perimeter of the SFR. It is our
understanding that the roof drains discharge into an infiltration trench located off of the west side of the
SFR. The infiltration trench was designed by Zenovic& Associates.
EnviroSound Consulting, Inc. • 3388 Byron Street Ste 200 NW • Silverdale, Washington 98383
Phone: (360) 698-5950 • Fax: (360) 698-5929
• • ESC12-GV013
242 Holland Drive
Page No. 2
May 24, 2012
Conclusions/Recommendations
The location of the SFR in relation to the adjoining slopes appears to be suitable. The exposed areas of
the slopes indicate dense to very dense glacial till and there was no visible evidence of significant erosion
or sloughing observed on the slopes at the time of the site visit.
Limitations
We have prepared this letter based on standard practices, currently used in this area at the time of
preparation. The conclusions are based on the observations made during the site visit. A subsurface
exploration program was not requested or conducted. The information presented in this letter was
collected and interpreted in a manner consistent with the level of care and skill ordinarily exercised by
members of the profession currently practicing under similar conditions. No other warranty, expressed or
implied, including (but not limited to) any warranty of merchantability or fitness for a particular use has
been made. Should you have any questions or concerns, which have not been addressed, or if we may be
of additional assistance,please call our office at (360) 698-5950.
Sincerely,
e oo Wash,
, A, 1 4$*
Shawn E. Williams, LEG. f' ''i
Senior Engineering Geologist ,' P -:'.'
IN •aneering Geologist
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IRMEMEME
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lip JUL 5 ?012
JEFFERSON COUNTY
DE_°T.OF COMMUNITY DEVELOPMENT
EnviroSound Consulting, Inc. • 3388 Byron Street NW Ste 200 • Silverdale, Washington 98383
Phone: (360) 698-5950 • Fax: (360) 698-5929