20120806171718925.pdfMain Office
17311 — 135" Avenue NE, A-500
Woodinville, WA 98072
(425)486-1669 FAX(425)481-2510
(425) 337-1669 Snohomish Gounty
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NELSON GEOTECHNICAL
AssociATEs,
GEOTECHNIcAL ENGINEERS & GEOLOGISTS
Engineering -Geology Branch
437 East Penny Road
Wenatchee, WA 98801
(509) 665-7696 FAX (509) 665-7692
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Phone: 425-486-1669
Fax- 425-481-2510
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Pages Including Cover Page: 3
NGA Job/File No. 4
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Main Office th Engineering -Geology Branch
17311 —135 Avenue NE, A-500 437 East Penny Road
Woodinville, WA 96072 Wenatchee, WA 98801
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486-1669 FAX (425) 481-2510 (509) 665-7696 FAX (509) 665-7692
(425) 337-1669 Snohomish County
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DATE: July 5, 2012
T0: Alan Bodine AY
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FROM: Khaled M. Shawish, PE
RE: Alan Bodine Property 9e�
Wall Surcharge-
Demonds, Washington
NGA File No. 7917C11 gc2i9>~5
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We have provided part-time construction monitoring fdr the new 2 -foot tall pin pile retaining wall
with timber lagging along the top of slope at the your residence located at 505 Paradise Lane in
Edmonds, Washington. We previously prepared a geotechnical evaluation letter for the retaining
wall titled "Geotechnical Engineering Letter Bodine Property — 505 Paradise Land — Edmonds,
Washington," dated April 27, 2007. We also provided a memorandum dated August 24, 2011. We
have been requested by Jim with Bodine Construction to address a comment made by the City of
Edmonds regarding the potential surcharge from the riew wall onto the existing concrete rubble
block wall that is now located directly in frontof the new wall in the northeastern corner of the
property,
It is our opinion that 'any surcharge onto the existing concrete rubble wall from the approximate two
feet of fill behind the timber lagging is insignificant. The average setback is approximately 12 to 24
inches, but since the pin piles being only three feet apart, they are acting as a retaining structure and
are buffering the rubble wall from the added surcharge. The new pin pile wall is acting as a
subsurface pile wall that picks up most of the surcharge and transfers the loads to the competent
material before it can impact the rubble wall. Also, the two feet or so of backfill that was placed
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Geotechnical Memo — Alan Bodine Property NGA File No. 7917C1 l
"Wall Surcharge July 5, 2012
Edmonds, Washington Page 2
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behind the new wall consists of free -draining material which should result in minimal surcharge on
the existing wall.
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All other recommendations for site drainage and long-term slope maintenance should be followed.
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We trust this memorandum should satisfy your needs at this time. Please contact us if you have any
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questions or require additional services.
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