HomeMy WebLinkAboutBLD2001-00096 Geotechnical Report 410 •
McMenamin Engineering
Consultants
DENNIS M. McMENAMIN, P.E.
June 22, 2001 D ECEHE �
^nr
JUN25 _ 01
Dan Shaw
8696 Beaver ValleyRoad JEFFERSON COUNTY
DEPT. OF COMMUNITY DEVELOPMENT
P. O. Box 515 _
Chimacum, Washington, 98325 �
Ref: Soils Report
Parcel Number 90114100i
NE 1/4, Section 14, T29N, R1W, W. M.
3/8 mile east of Chimacum
Jefferson County
Dear Mr. Shaw:
I have visited your site to observe the inspection pits excavated in the proposed •
detached garage with a bonus room above. I have also visited the Jefferson County
Community Development office to review the Critical Areas maps, specifically in the
areas near your residence
Your property is located in the NW 1/4, Section 14, Township 29 North, Range 1
West, Willamette Meridian. It is located at the toe of the slope of east side of
Chimacum Valley about 3/8 mile from the main intersection in Chimacum.
See attached vicinity map for location.Enclosure 1, General Area Map
Enclosure la, Vicinity Map
Enclosure 2, Aerial Map
CIVIL • STRUCTURAL • LAND PLANNING
P.O. Box 2525
Silverdale, WA 98383
(360)692-5500
In reviewing the Jefferson County Critical Areas Maps and the Soil Survey of
Jefferson County prepared by the United States Department of Agriculture, Soil
Conservation Service, Issued August 1975 we have determined the following
information.
Your residence is situated on the Clallam Series soil and further classified as Clallam
gravelly sandy loam, CmC. The proposed garage and bonus room are situated on the
Tukey Series soil and further classified as Tukey gravelly loam. The soil inspection
pits in the vicinity or you garage verified this information.
The soils encountered in the inspection pits had a shallow topsoil layer underlain with
a dense gravelly loam. This soil is very compact and near a till condition. The soil in
this area is at a slope of 1 vertical to 21/2 horizontal. ( 40 percent )
In looking at the critical areas landslide hazard map for Jefferson County the soil
area is listed as a moderate landslide hazard. See Enclosure 3, Landslide Hazard
Map.
In reviewing the Landslide Hazard Map further the high landslide areas appear to be
further south where the road section cut slopes are in the range of 1 vertical to 1 1/2
horizontal ( 67 percent)
In summary, the area for the proposed garage is stable. The existing slopes will not
be changed. I recommend that footing drains from daylight basement garage
foundation be drained to daylight. The downspouts should be tightlined in a separate
line to daylight. The foundation should be backfilled with a free draining gravel.
5ECE [ WE -- --1
Li J U N 2 5 2001
JEFFERSON COUNTY
^T MMUNITY DEVELOPMENT
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3-D topoQiads Copyright 0 1999 Dame!mouth,A 040N Source Data: 1868 1 11000 ft Seale: 1 : 25.000 Detail: 13-0 Data:90001
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Map Output • • Page 1 of 1
901141002
141001 Legend
Parcels
Landslide Hazard
"•1000600 ■
9litlea
In High
I. Moderato
Slight
•
901141025
i
i
Maps •roridOa •y olforson Coun ant-al ertioes-IDMS I• I 'irift
FOR INFORMATIONAL PURPOSES ONLY-
efferson County does not attest to the accuracy of the data contained herein and makes no warranty with
respect to its correctness or validity. Data contained in this map is limited by the method and accuracy of its
ollection. Features depicted on this map must be verified in the field.
oning information is based on the 1998 Comprehensive Plan Map and does not include changes made
•uring the 1999 Comprehensive Plan amendment process. Zoning designations must be confirmed with the
De•artment of Communi Develo•ment.
JUN 2 5i J
e lit e
http://w.../com.esri.esrimap.Esrimap?ServiceName=Critical_Areas&Form=True&Encode=Tru 5/29/01
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An allowable soil bearing value of 2,000 pounds per square foot may be used. The
equivalent fluid pressure for the retaining wall design should be 30 pounds per square.
If you should have any further questions call me.
F,',. move
Very truly yours,
M enamin Engineering Consultants, Inc. . 0 �
4 27 _(.-7-1't'-'
Dennis M. McMenamin, P. E. low,
President Vz z/Gi
ExPI . 3/2/ 03
Enclosures : Vicinity Map, Aerial Map, Landslide Hazard Map
J 2004
75FLECE [ YEFF
U \\ . 1 2 -3 ::I 11.-j)
JEF,'ERSON COUNTY
DEPT ^lF "^MMUNITY CEVELO MENT