HomeMy WebLinkAboutShort Plat Evaluation - BLD Engineering / Geo-tech Reports - 9/5/1996 � J 3Z23.0- 7Y ooi-Iry
Bradley-Noble Geotechnical Services
A Division of The Bradley Group, Inc.
2401 Bristol Court SW, Olympia, WA 98502 PO Box 12267, Olympia, WA 98508-2267
Phone 360-357-7883 FAX 360-754-4240
5 September 1996
Mr. Sidney Bechtolt, P.L.S. 3 zZ3 --7 Of z5l 7/
Agate Land Surveying
E 2680 Agate Road ' 0� 73*
Shelton, Washington 98584 9O173
7
Subject: Evaluation of the proposed Short Plats
for lots 24A, 24B, 24C, and 24D for
Alfred Jones Jr. , Mason County Tax
Parcel 32235-75-00240; Lots 17A, 17B,
17C, and 17D for Doris Gail Darough,
Mason County Tax Parcel 32235-75-00170,
and Lots 18A, 18B, 18C, and 18D for Tom
Logen, Mason County Tax Parcel
32235-75-00180 as being in a Landslide
Hazard Area as defined by Mason County
Interim Resource Ordinance No. 77-93 .
Dear Mr. Bechtolt:
As requested, we conducted a reconnaissance level
survey of the above properties to determine if mass
wasting events have been active or are likely to occur
on the above lots . This letter will present our
observations and opinions based on this site survey
and on our research.
These Short Plats are located in the Timbertides
Development in the plateau area above the south shore
of Hood Canal . Proposed lots 17A and 18D will include
existing residences that have been constructed on the
north side Windstar Road and are at the crest of the
north slope down into the Hood Canal . Lot 17B may
have a potential building site on the north side of
Windstar which would result in a residence being
constructed in the top of the slope area. If this
area is to be used for construction, a detailed
geotechnical report addressing slope stability and
drainage issues should be prepared once the location
and type of construction is identified.
Referring to Plate 1 of the Mason County Water Supply
96090901
Page 1 of 2
-^ C ✓ r
96090901
Page 2 of 2
Bulletin 29 , prepared by the Washington State
Department of Water Resources and in cooperation with
the U.S . Geological Survey, we find the geology of
this area identified. Soils in the north facing slope
are indicated as Vashon age advance outwash units with
the upland area as being Vashon subglacial till .
Slope stability in the area is generalized in the
Coastal Zone Atlas for Mason County, Washington, map
MA-9 which indicates the north facing slope as being
of intermediate stability and the upland area as
stable. Based on our field observations, we concur
with these finding on apparent slope stability.
With the exception of lot 17B already discussed, we
found the rest of the lots in the proposed Short Plat
subdivisions to be in the upland area south of
Windstar Road in the area of low relief with a very
gentle slope up to the south. Soils exposed are
interpreted as being Vashon recessional outwash
deposits of sands and gravels . We expect that these
deposits are relatively thin before the very dense and
highly overconsolidated subglacial till is exposed.
Slopes in the area of proposed subdivisions are not in
excess of 10 degrees .
It is our opinion, based on our site survey and
research, that the area proposed for subdivisions is
not in a landslide hazard area as defined by ordinance
or the geologic sciences . There is no indication of
slope instability in the upland area.
If you have any questions, or if we may be of
additional service to you and your clients, please
contact us at our Olympia office.
Cordially,
B LEY-NOBLE GEOTECHNICAL SERVICES
David C. Strong
Engineering Geologist
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DNINd VM
September 11, 1996
To: Jerry Hauth/Alan Tahja
From: Randy Neff VIA
RE: Geo-tech Assessments for Tom Logen SP#96-0143, Martin Jensen
SP#95-0008 & SEPA#96-0043, Karin Locke SP#96-0056 & SEPA 96-
0113, William McTurnal, Large Lot Subdivision #96-0006 &
SEPA #96-0065, Alfred Jones SP# 96-0106 and
Doris Gail Darough SP# 96-0082 .
We received numerous geo-tech assessments as you can tell by
the above listing. Would you please review these geo-tech
assessments and let us know if they meet the standards. Thanks
for all the help in processing these short plats and geo-tech
assessments .
Thanks