HomeMy WebLinkAboutGEO2024-00051 - GEO Geological Review - 5/21/2024 1-1
c¢ RECEIVED
MAY 21 2024
615 W. Alder Street
Geological Assessment
Empire Homes SFR
XXX E Bridger Lane, Shelton
Parcel No. 32021-53-04034 & 32021-53-04035
Mason County, Washington
April 29, 2024
Project#24082
Prepared For:
Empire Home Construction,LLC
PO Box 241
Kelso, Washington 98626
Prepared By:
Envirotech Engineering, PLLC
PO Box 984
Belfair,Washington 98528
Phone: 360-275-9374
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4/29/24
, MASON COUNTY Submittal Checklist
COMMUNITY SERVICES Geological Assessment
building,Planning,Environmental Health,Community Health
Instructions:
This checklist must be submitted with a Geological Assessment and completed,signed, and stamped by the licensed
professional(s)who prepared the Geological Assessment for review by Mason County pursuant to the Mason County
Resource Ordinance. If an item is found not applicable,the report should explain the basis for the conclusion.
Note: Unless specifically documented, this report does not provide compliance to the International Residential Code
Sections R403.1.7 for foundations on or adjacent to slopes, Section R403.1.8 for expansive soils or section 1808.7.1
of the International Building Code Section for Foundations on or adjacent to slopes.
Applicant/Owner Empire Home Construction, LLC Parcel#32021-53-04034 & 32021-
53-04035
Site Address XXX E Bridger Lane, Shelton
(1) A discussion of the geologic conditions in the general vicinity of the proposed development,with geologic unit
designation based on referenced maps.
Located on page(s) 5
(2) (a) A discussion of ground water conditions,
Located on page(s) 7
(b) A discussion of the estimated depth to water.
Located on page(s) 7
(c) A discussion of the quantity of surface seepage,
Located on page(s) 7
(d) A discussion of the upslope geomorphology,
Located on page(s) 3
(e) A discussion of location of upland waterbodies and wetlands.
Located on page(s) 3
(3) The approximate depth to hard or dense,competent soil,e.g.glacial till or outwash sand.
Located on page(s) 6
(4) A discussion of any geomorphic expression of past slope instability (presence of hummocky ground
or ground cracks,terraced topography indicative of landslide block movement, bowed or arched trees
indicating downslope movement,etc).
Located on page(s) 4
(5) A discussion of the history of landslide activity in the vicinity, as available in the referenced maps and.
records.
Located on page(s) 8
(6) An opinion on whether the proposed development is within the landslide hazard area or its associated buffer or
setback and the potential for landslide activity at the site in light of the proposed development.
Located on page(s) 8
(7) A recommendation by the preparer whether a Geotechnical Report should be required to further evaluate site
conditions and the proposed development of the subject property.
Located on page(s) 13
(8) If the presence of a hazard is located within 300 feet of the proposed development,then the following are
delineated on a geologic map/site map:
(a) The area of proposed development,
Located on map(s) n/a
(b) The boundaries of the landslide hazard area(top, both sides, and toe).
Located on map(s) n/a
(c) The associated buffers(top, both sides, and toe),
Located on map(s) n/a
(d) Building or other setbacks(top, both sides, and toe),
Located on map(s) n/a
(9) A site map drawn to scale showing the property boundaries,scale, north arrow,and the location and nature of
existing and proposed development on the site.
Located on Map(s) Geologic Site Plan (Appendix A)
I, Michael Staten, hereby certify under penalty of perjury that I am a civil engineer licensed in the State of Washington
with specialized knowledge of geotechnical/geological engineering or a geologist or engineering geologist licensed in
the State of Washington with special knowledge of the local conditions. I also certify that the Geological Assessment
dated April 29, 2024 ,and entitled Empire Homes SFR, meets all the requirements of the Mason
County Resource Ordinance, Geologically Hazardous Areas Section, is complete and true,that the assessment
demonstrates conclusively that the risks posed by the landslide hazard can be mitigated through the included
geotechnical design recommendations, and that all hazards are mitigated in such a manner as to prevent harm to
property and public health and safety.
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43045
Disclaimer:Mason County does not certify the quality of
S/O\A the work done in this Geological Assessment.
4/29/24 9
Page 2 of 2
TABLE OF CONTENTS
1.0 INTRODUCTION.................................................................................................................................1
1.1 PROJECT INFORMATION.................................................................................................................... 1
1.2 PURPOSE OF INVESTIGATION AND SCOPE OF WORK........................................................................ 1
2.0 SURFACE CONDITIONS....................................................................................................................3
2.1 TOPOGRAPHY..................................................................................................................................... 3
2.1.1 Upslope Geomorphology............................................................................................................3
2.2 SURFACE DRAINAGE..........................................................................................................................3
2.2.1 Upland Water Bodies.................................................................................................................3
2.3 SLOPE AND EROSION OBSERVATIONS...............................................................................................4
3.0 SUBSURFACE INVESTIGATION.....................................................................................................5
3.1 FIELD METHODS,SAMPLING AND FIELD TESTING...........................................................................5
3.2 GEOLOGIC CONDITIONS....................................................................................................................5
3.3 SPECIFIC SUBSURFACE CONDITIONS.................................................................................................5
3.3.1 Groundwater............................................................................................................................... 7
4.0 ENGINEERING CONCLUSIONS......................................................................................................8
4.1 LANDSLIDE HAZARDS......................................................................................................................... 8
4.1.1 Landslides and Slope Stability Analysis...................................................................................10
4.1.2 Surface and Subsurface Drainage...........................................................................................10
4.2 EROSION HAZARDS...........................................................................................................................10
4.3 SEISMIC HAZARDS.............................................................................................................................11
4.4 OTHER CONSIDERATIONS.................................................................................................................12
5.0 CLOSURE.............................................................................................................................................13
Appendix A—Geological Site Plan
1.0 INTRODUCTION
Envirotech Engineering, PLLC. (Envirotech) has completed this geological assessment
for 2 adjacent residential properties located at XXX E Bridger Lane, Shelton, identified
as parcel numbers 32021-53-04034 & 32021-53-04035 in Mason County, Washington.
As presented herein, this assessment includes information pertaining to the project in this
Introduction Section; observations of the property and surrounding terrain in the Surface
Conditions Section; field methods and soils descriptions in the Subsurface Investigation
Section; and, assessments for landslides, erosion, seismic hazards, and other
considerations in the Conclusions Section.
An initial geological/geotechnical evaluation of the project was conducted by Envirotech
on March 25, 2024. It was determined that natural slopes between 15% and 40% were
present within 300 feet of the project. Due to these slope grades, a geological assessment
is required pursuant to landslide hazard areas of the Mason County Resource Ordinance
(MCRO) 8.52.140.
During the evaluation and site visit by Envirotech, surface and subsurface conditions
were assessed in order to determine if further geotechnical studies are required. After
completion of the field work and applicable project research, Envirotech prepared this
geological assessment.
1.1 Project Information
Information pertaining to the project was provided by the proponent of the property, and
observations from a field visit by Envirotech. The proposed development is expected to
consist of a single family residential development, and other ancillary features typical of
this type of development . Approximate site development footprint with relation to
existing geological site features are illustrated in the Geological Site Plan in Appendix A
of this report.
1.2 Purpose of Investigation and Scope of Work
The purpose of this geological assessment was to evaluate the project in order to confirm
that the proposed development is outside of any landslide hazard area and its associated
buffers and setbacks as determined in the MCRO. The investigation included
characterizing the general project surface and subsurface conditions, and evaluating the
suitability of the soils to support the planned site development. In order to fulfill the
purpose of investigation, the geological/ geotechnical program completed for the
proposed improvements of the project include:
• Review project information provided by the proponent of the project;
• Conduct a site visit to document the site conditions that may influence the
construction and performance of the proposed improvements;
Envirotech Engineering Geological Assessment
PO Box 984 page 1Parce132021-53-04034&32021-53-04035
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 April 29, 2024
• Define general subsurface conditions of the site by observing soils within test pit
excavations, review well logs from existing wells near the project, and evaluate
geological and hazard maps depicting the site geology for the vicinity of the
project;
• Perform soils testing, such as visual classifications, to determine selected index
properties of the soils;
• Complete an engineering assessment supported by planned site alterations and the
surface and subsurface conditions that were identified by the field investigation,
soil testing, and applicable project research; and,
• Establish engineering conclusions based on findings and anticipated development.
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Vicinity Map from Mason County Website
Envirotech Engineering Geological Assessment
PO Box 984 page Parcel 32021-53-04034& 32021-53-04035
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 April 29, 2024
2.0 SURFACE CONDITIONS
Information pertaining to the existing surface conditions for the project was gathered on
March 25, 2024 by a representative with Envirotech. During the site visit, site features
were documented that may reveal potential geological hazards.
This Surface Conditions Section provides information on topography, drainage and slope/
erosion conditions for the project and surrounding areas. An aerial photo of the project
and immediate vicinity is provided on the following page.
2.1 Topography
The topographic information provided in this section was extrapolated from a public lidar
source, and incorporated observations and field measurements. Where necessary, slope
verification included measuring slope lengths and inclinations with a cloth tape and
inclinometer. See the Geological Site Plan in Appendix A for an illustration of the
general slope indicators with respect to the planned development.
Other than road cuts, maximum sloping grades within 300 feet of the proposed
development area with a vertical relief in excess of at least 10 feet were observed to be
25% .
2.1.1 Upslope Geomorphology
The landform that is upland from property is considered a hillside of glacial origin
with centuries of weathering overburden. Additional geomorphology that is
pertinent to both upslope and downslope areas are provided in the Subsurface
Investigation Section of this report.
2.2 Surface Drainage
The majority of the stormwater runoff originating upslope from the anticipated
development is expected to be minimal to moderate . Significant scour, erosion and
sediment transport was not apparent near the project.
2.2.1 Upland Water Bodies
There are no apparent water bodies or wetlands located upslope from the planned
development that would significantly influence the project.
Envirotech Engineering Geological Assessment
PO Box 984 page 3Parcel 32021-53-04034 & 32021-53-04035
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 April 29, 2024
2.3 Slope and Erosion Observations
The existing moderate slopes near the project signal a potential landslide or erosion
hazard area. Some indicators that may suggest past slope movements include:
• Outwash of sediments near the bottom of the slope,
• Fissures, tension cracks or naturally stepped land masses on the face or top of the
slope, and parallel to the slope,
• Fine, saturated subsurface soils,
• Old landslide debris,
• Significant bowing or leaning trees, or,
• Slope sloughing or calving.
The above-mentioned indicators, or other signs of significant mass wasting on the
property or within the general vicinity of the project were not observed or discovered
during research. Indications of past landslides, current unstable slopes, deep-seated slope
problems, or surficial slope failures were not observed during the site visit.
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Aerial Photo from Mason County Website
Envirotech Engineering Geological Assessment
PO Box 984 page Rarcel 32021-53-04034 & 32021-53-04035
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 April 29, 2024
3.0 SUBSURFACE INVESTIGATION
Information on subsurface conditions pertaining to the project was gathered during
research and a site reconnaissance. The site visit was accomplished on March 25, 2024 by
a representative with Envirotech. Specific information on field methods, sampling, field
testing, subsurface conditions, and results from soil testing are presented in this section of
the report.
3.1 Field Methods, Sampling and Field Testing
Information on subsurface conditions for the project was accomplished by probing
anticipated foundation areas with hand tools, and observing soils within test pit
excavations and/ or earth cuts. Information on subsurface conditions also included
reviewing geological maps within the project vicinity, and water well reports originating
from nearby properties. No soil samples were collected for this project. Envirotech
measured the relative density of the in-situ soils by gauging the resistance of hand tools.
3.2 Geologic Conditions
In general, soils at the project are composed of materials from glacial advances. The
geologic conditions as presented in the "Geologic Map of Washington," compiled by J.
Eric Schuster, 2002 indicates Quaternary sediments, Qg. Quaternary sediments are
generally unconsolidated deposits, and dominantly deposited from glacial drift, including
alluvium deposits. This project is located within the Puget Lowland. Typically, "lower
tertiary sedimentary rocks unconformably overlie the Crescent Formation." as revealed in
the Geologic Map. Initial sedimentary rocks were formed from shales, sandstones and
coal deposits from rivers. During the Quaternary period, the Puget Lowland was covered
by numerous ice sheets, with the most recent being the Fraser glacier with a peak of
approximately 14,000 years ago. Upon the glacial retreat, the landscape was formed by
glacial erosion glacial drift deposits. More specifically for the project location, a caption
from the Washington State Department of Natural Resources is as follows:
Map Unit: Qgt
Age: Quaternary
GeoMaterial: Glacial till
Description: Unsorted, unstratified, highly compacted mixture of clay, silt, sand, gravel,
and boulders deposited by glacial ice; may contain interbedded stratified sand, silt, and
gravel.
3.3 Specific Subsurface Conditions
The following subsurface conditions are estimated descriptions of the project subgrade
utilizing information from the depth of penetration at all testing, sampling, observed and
investigated locations.
Envirotech Engineering Geological Assessment
PO Box 984 page 5Parcel 32021-53-04034 & 32021-53-04035
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 April 29,2024
Soils for this project were described utilizing the Unified Soil Classification System
(USCS). Using the USCS in conjunction with estimated relative densities and other
anticipated engineering properties of the soil, susceptibility for potential landslides,
erosion and seismic hazards may be assessed.
The project is primarily composed of undisturbed, native soils, without indications of
substantial fill. Competent bearing soils were encountered at 18 inches below the existing
native ground surface in locations where the ground was probed. For engineering
purposes, these native soils consist of distinguishable layers, as presented below.
Soils within the upper 4.5 feet of natural ground were observed to be primarily moist,
brown silty sand with gravel (SM) . Soils below this upper soil strata were observed to
be increasing in density with signs of cementation or hardpan.
According to the "Soil Survey of Mason County," by the United States Department of
Agriculture, Soil Conservation Service (SCS), the site soils are described as Shelton
gravelly sandy loam with 5%- 15% slopes. See the soil map below.
Envirotech Engineering Geological Assessment
PO Box 984 page 6Parcel 32021-53-04034 & 32021-53-04035
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 April 29, 2024
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Soil Survey From USDA Natural Resources Conservation Service
3.3.1 Groundwater
From the water well report(s) and knowledge of the general area, permanent
groundwater is at least 50 feet below the current ground surface. Surface seepage
or perched groundwater at shallow depths was not observed on-site, nor indicated
on the well reports.
Envirotech Engineering Geological Assessment
PO Box 984 page Varcel 32021-53-04034 & 32021-53-04035
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 April 29, 2024
4.0 ENGINEERING CONCLUSIONS
The following sections present engineering assessments and conclusions concerning the
project. These conclusions have been made available based on the planned construction
activities as outlined in the Introduction Section of this report; general observations of
drainage and topography as summarized in the Surface Conditions Section; and, soil
conditions that were identified by the field investigation and soils testing as outlined in
the Subsurface Investigation Section. Conclusions for the project that is provided herein,
includes pertinent information for landslide, erosion and seismic hazards.
4.1 Landslide Hazards
For the planned development, as provided in the Introduction Section of this report, it is
Envirotech's opinion that the proposed development is not subjected to or cause adverse
impacts to a landslide hazard area or its associated buffer or setback as defined in the
MCRO. This conclusion is based on the contents provided in this report.
Landslides are natural geologic processes, and structures near slopes possess an inherent
risk of adverse settlement, sliding or structural damage due to these processes.
Geotechnical engineering cannot eliminate these risks for any site with sloping grades
because gravity is constantly inducing strain on the sloping soil mass. Excessive wet
weather and/ or earthquakes will exacerbate these strains. Geotechnical engineering
considers excessive wet weather and `design' earthquakes in order to provide an
acceptable factor of safety for developing on or near sloping terrain. These factors of
safeties are based on engineering standards such as defining engineering properties of the
soil, topography, water conditions, seismic acceleration and surcharges.
Surface sloughing or other types of surficial slope movements usually do not affect the
deep-seated structural capability of the slope. However, excessive and/or repeated
surficial slope movements, if not repaired, may represent a threat to the structural
integrity of the slope. Maintenance of the slope should be completed if the situation does
arise in order to prevent the possibility of further surficial or deep seated slope
movements that may be damaging to life or property.
According to the Coastal Zone Atlas of Mason County, Washington, the project is within
and near terrain labeled `Stable' and `Unstable' regarding potential landslide activity.
Descriptions of the designations can be found in the aforesaid Atlas. A site specific
analyses and conclusions concerning the slopes are presented herein. A Stability Map
from the Coastal Zone Atlas for the general area of this project may be found below.
Envirotech Engineering Geological Assessment
PO Box 984 page 8Parcel 32021-53-04034 & 32021-53-04035
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 April 29, 2024
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Project
Map from Washington State Department of Ecology Website
According to the Department of Natural Resources (DNR) "LHZ — Final A-1 Map —
Landslide Inventory — Mason Watershed, by Sarikhan, et. al., May 2007," previous
landslide activity is not recorded near the project.
Per the Resource Map from DNR, the project is not within terrain labeled `highly
unstable' or `highly erodible' relating to soils. DNR labeled portions of this project or
near the project as medium to high slope instability with relation to slopes. This
delineation is primarily dependent upon slopes and convergence. Secondly, lithology and
precipitation are modeled within this delineation. In summary, this designation is based
on mapping without field observations or knowledge of the specific site geology or soils.
A resource map from DNR is provided below:
Envirotech Engineering Geological Assessment
PO Box 984 page 9Parcel 32021-53-04034 &32021-53-04035
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 April 29, 2024
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Map from Washington State Department of Natural Resources Website
4.1.1 Landslides and Slope Stability Analysis
Past landslide activity or high slope instability indicators near the proposed
development was not revealed during the project research. In addition, detrimental
landslide activity or potential high landslide indicators were not observed during
the site visit as outlined in the Surface and Subsurface Conditions Sections of this
report. Due to these factors, and existing/ proposed conditions, a slope stability
analysis was not deemed necessary for this project. Considering the planned
construction as summarized in the Introduction Section of this report; the
aforementioned surface and subsurface conditions for the project; the slope
stability assessment provided herein; and the Engineering Conclusions provided
later in this report, it is our opinion that the project is not within a landslide hazard
area, and that the proposed site alterations will not encourage a landslide hazard.
4.1.2 Surface and Subsurface Drainage
This project does not appear to experience significant subsurface drainage or
surface runoff. It is our opinion that groundwater or surface drainage is not a
limiting factor for this project.
4.2 Erosion Hazards
Based on the USCS description of the project soils, the surface soils are considered
moderately erodible. According to the Resource Map from the Washington State DNR, as
provided above, the project is not within terrain labeled `highly erodible.' This project is
Envirotech Engineering Geological Assessment
PO Box 984 page 1OParcel 32021-53-04034 & 32021-53-04035
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 April 29, 2024
not within an erosion hazard area as defined by the MCRO. Erosion hazard areas are
those with USDA SCS designations of River Wash (Ra), Coastal Beaches (Cg),
Alderwood Gravelly Sandy Loam on slopes 15% or greater(Ac and Ad), Cloquallum Silt
Loam on slopes 15% or greater (Cd), Harstine Gravelly Sandy Loam on slopes 15% or
greater(Hb), and Kitsap Silt Loam on slopes 15% or greater(Kc).
Temporary and/ or permanent erosion control measures may be required for any site
when land disturbance is involved. Erosion control will mostly depend on the timeliness
of construction, moisture content of the soil, and amount of rainfall during construction.
Soil erosion typical to the existing conditions and planned disturbance of this project
include wind-borne silts during dry weather, and sediment transport during prolonged wet
weather. Sediment transport of disturbed soils could be from stormwater runoff or
tracking off-site with construction equipment. Although an engineered erosion control
plan is not warranted for this project, Best Management Practices (BMP's) should be
employed during and after construction. Ordinary BMP's includes silt fencing, protection
of drainage outlets and vegetating denuded areas.
Erosion control information and specifications may be found in the applicable
"Stormwater Management Manual for Western Washington," prepared by the
Washington State Department of Ecology Water Quality Program.
4.3 Seismic Hazards
Soils immediately below the expected foundation depth for this project are generally
Type D, corresponding to the International Building Code (IBC) soil profiles. According
to the IBC, the regional seismic zone is 3 for this project. The estimated peak ground
acceleration ranges from 0.50g to 0.60g. This estimation is based on the United States
Geological Survey (USGS) National Seismic Hazard project in which there is an
estimated 2% probability of exceedance within the next 50 years.
There are no known faults beneath this project. The nearest Class `A' or 'B' fault to this
property is the Tacoma Fault Zone , which is not located on the property or adjacent
properties. This information is supported by the USGS Quaternary Fault and Fold
Database for the United States.
The potential for liquefaction and other earthquake induced hazards are believed to be
low for this project. This is based on subsurface conditions such as soil characteristics
and the lack of a permanent and substantial shallow water table. Subgrade characteristics
that particularly contribute to problems caused by seismic events include submerged and
confined, poorly-graded granular soils. Although gravel- and silt-sized soil particles
could be problematic, fine and medium grained sands are typically subjected to these
types of seismic hazards.
Envirotech Engineering Geological Assessment
PO Box 984 page I IParcel 32021-53-04034 &32021-53-04035
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 April 29,2024
4.4 Other Considerations
It is our opinion that the entire parcel is buildable without restrictions. This includes
structures, driveways, septic system installation and tree removal. Conclusions in this
report are based on the type and location of the anticipated development, and existing on-
site and off-site conditions. Site development that significantly deviates from the
anticipated improvements presented in this report, or nearby development that influences
this project may require geotechnical design recommendations.
Envirotech Engineering Geological Assessment
PO Box 984 page 12Parcel 32021-53-04034 &32021-53-04035
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 April 29,2024
5.0 CLOSURE
Based on the project information and site conditions as presented in this report, it is
Envirotech's opinion that additional geotechnical studies are not required to further
evaluate this project.
Due to the inherent natural variations of the soil stratification and the nature of the
geotechnical subsurface exploration, there is always a possibility that soil conditions
encountered during construction are different than those described in this report.
Therefore, it is recommended that Envirotech is promptly notified if project and
subsurface conditions found on-site are not as presented in this report so that we can re-
evaluate our recommendations.
This report presents a geological/ geotechnical assessment, and is intended only for the
owner, or owners' representative. Furthermore, this report is only valid for the project
information and location described herein.
The services described in this report were prepared under the responsible charge of
Michael Staten, a professional engineer with Envirotech. Michael Staten has appropriate
education and experience in the field of geotechnical engineering in order to assess
landslide hazards, earthquake hazards, and general soil mechanics.
Please contact Michael Staten at 360-275-9374 if you have any questions, comments, or
require additional information.
Sincerely,
Envirotech Engineering
/ r�
Michael Staten, P.E.
Geotechnical Engineer
Envirotech Engineering Geological Assessment
PO Box 984 page 13Parcel 32021-53-04034& 32021-53-04035
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 April 29, 2024
E
APPENDIX A
GEOLOGIC SITE PLAN
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