HomeMy WebLinkAboutGeological Assessment - BLD Engineering / Geo-tech Reports - 8/2/2021 MASON COUNTY
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 Anthony Claflin Parcel# 32212-76-00130
Site Address XXX NE Sanctuary Lane
(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) 6
(b) A discussion of the estimated depth to water,
Located on page(s) 6
(c) A discussion of the quantity of surface seepage,
Located on page(s) 6
(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) 5
(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) 7
•1.
(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) 7
(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) 10
(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) Site Plan(A2pendix 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 5/14/2021 ,and entitled Claflin Single Family Residential Property , 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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5/14/2021
Disclaimer:Mason County does not certify the quality of
the work done in this Geological Assessment.
Page 2 of 2
r,
Geological Assessment
Claflin Single Family Residential Property
XXX NE Sanctuary Lane, Tahuya
Parcel No. 32212-76-00130
Mason County, Washington
May 14, 2021
Project#21120
Prepared For:
Anthony Claflin
8308 16th Ave NW
Seattle, WA 98117
Prepared By:
Envirotech Engineering
PO Box 984
Belfair, Washington 98528
Phone: 360-275-9374
Pt CLYOt S43043
NVAS
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5/14/2021
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 GENERAL OBSERVATIONS.................................................................................................................. 3
2.2 TOPOGRAPHY..................................................................................................................................... 3
2.2.1 Upslope Geomorphology............................................................................................................ 3
2.3 SURFACE DRAINAGE.......................................................................................................................... 3
2.3.1 Upland Water Bodies................................................................................................................. 3
2.4 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............................................................................................................................... 6
4.0 ENGINEERING CONCLUSIONS......................................................................................................7
4.1 LANDSLIDE HAZARDS.........................................................................................................................7
4.1.1 Landslides and Slope Stability Analysis.................................................................................... 8
4.1.2 Surface and Subsurface Drainage............................................................................................ 8
4.2 EROSION HAZARDS............................................................................................................................ 8
4.3 SEISMIC HAZARDS..............................................................................................................................9
4.4 OTHER CONSIDERATIONS..................................................................................................................9
5.0 CLOSURE.............................................................................................................................................10
Appendix A-Site Plan
Appendix B -Soil Information
1.0 INTRODUCTION
Envirotech Engineering, PLLC. (Envirotech) has completed this geological assessment for a
residential property located at XXX NE Sanctuary Lane, identified as parcel number 32212-76-
00130 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 May
1,2021. 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).
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 new single family residence, on-site septic system, and other ancillary features typical of this
type of development. Approximate site development with relation to existing site features are
illustrated in the 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;
• 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.
Envirotech Engineering Geological Assessment
PO Box 984 page 1 Parcel 32212-76-00130
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 May 14,2021
A
Project
1t„iw Tahuya
Vicinity Map from Mason County Website
Envirotech Engineering Geological Assessment
PO Box 984 page 2 Parcel 32212-76-00130
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 May 14,2021
2.0 SURFACE CONDITIONS
Information pertaining to the existing surface conditions for the project was gathered on May 1,
2021 by a representative with Envirotech. During the site visit, site features were documented that
may influence construction or reveal potential geological hazards. This Surface Conditions
Section provides information on general observations, vegetation, topography, drainage and
slope/erosion conditions for the project and surrounding areas.
2.1 General Observations
The property is currently vacant land surrounded by residential development. NE Sanctuary Lane
runs through the property, and the development will be on the east side of the roadway.
Vegetation on and near the property consists primarily of firs, cedars, and other trees and
shrubbery common to this area of the Pacific Northwest. An aerial photo of the Project and
immediate vicinity is provided on the following page.
2.2 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 Site
Plan in Appendix A for an illustration of the general slope indicators with respect to the planned
development.
Descending slopes exceeding 15% are located on and beyond the property. Average slope grades
are approximately 6% with a vertical relief of approximately 50 feet. Steeper critical slopes are
near the west end of the property, but will be located over 300 feet from the planned
development.
2.2.1 Upslope Geomorphology
Ascending grades are generally located to the northeast of the planned development. This
slope is relatively minor within 300 feet of the Project, with no apparent slope grades of
at least 15%. The upland area of the property is situated on a hillside and crest.
Landforms are primarily 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.
2.3 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.
2.3.1 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 3 Parcel 32212-76-00130
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 May 14,2021
2.4 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 4 Parcel 32212-76-00130
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 May 14, 2021
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 May 1, 2021 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. Appendix B has pertinent
information on subsurface conditions for the Project,including test pit log(s)representative of the
site soils, and water well report(s)originating from the subject property and/or nearby properties.
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.
The "Geologic Map of the Lilliwaup 7.5-minute Quadrangle, Mason County, Washington' by
Trevor A. Contreras, Gabriel Legorreta Paulin,Jessica L. Czajkowski, Michael Polenz, Robert L.
Logan, Robert J. Carson, Shannon A. Mahan, Timothy J. Walsh, Chris N. Johnson, and Rian H.
Skov,June 2010,provides the following caption(s) for the project area:
Vashon ice-contact deposits—Gravel.dianucton,and till;yellow-tau to gray;loose to dense;
clasts subangular to rounded;variably sorted;massive to well stratified.Locally divided into:
Vashon lodgment till—Sand,pebbles,cobbles.silt,and clay(dianucton);gray;compact;clasts
subangular to rounded.unsorted and unstratified;includes northern-and local-source material.
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. 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
Envirotech Engineering Geological Assessment
PO Box 984 page 5 Parcel 32212-76-00130
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 May 14, 2021
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 feet of natural ground were observed to be moist, brown silty sand with
gravel (SM). Expanded and specific subsurface descriptions, other than what is provided in this
section,are provided in the soil logs located in Appendix B of this report.
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 Alderwood Gravelly
Sandy Loam, Ab and A,, with 8% - 30% slopes; Everett Very Gravelly Sandy Loam, Eh, with 8%
- 15% slopes, and Rough Broken Land, Rb. See the soil map below, and the applicable SCS soil
profile(s)in Appendix B of this report.
N
A
o x xx, Ao 3W
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 100 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. However, some seasonal groundwater is expected to flow directly above the
hardpan on occasion.
Envirotech Engineering Geological Assessment
PO Box 984 page 6 Parcel 32212-76-00130
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 May 14,2021
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 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 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 7 Parcel 32212-76-00130
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 May 14,2021
Project
Scils Hyd is So Is
Soils Highly Un;tab a Soils
t
[
Soils-Highly Erocibl>Soils
Westside Slope St3hilry Model(FP) 1
0 0.1 0.2mi tAoderate sine InstaCtlity 1
1:18.056 ■ High Sop,:,,Iratabildy
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 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
Envirotech Engineering Geological Assessment
PO Box 984 page 8 Parcel 32212-76-00130
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 May 14,2021
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. This fault is Class `B', and is located approximately 4 miles to the
southeast of the Project. 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.
4.4 Other Considerations
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 9 Parcel 32212-76-00130
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 May 14,2021
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 _�(/��/•`y//A
Jessica Smith,M.S. Michael Staten,P.E.
Staff Geologist Geotechnical Engineer
Envirotech Engineering Geological Assessment
PO Box 984 page 10 Parcel 32212-76-00130
Belfair,Washington 98528 Mason County,Washington
Ph. 360-275-9374 May 14, 2021
APPENDIX A
SITE PLAN
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APPENDIX B
SOIL INFORMATION
TEST PIT LOG
TEST PIT NUMBER TP-1
PROJECT: SFR Geological Assessment DATE OF LOG: 05/1/2021
PROJECT NO: 21120 LOGGED BY: MCS
CLIENT: Claflin EXCAVATOR: N/A
LOCATION: Parcel 32212-76-00130 DRILL RIG: None
Mason County. Washington ELEVATION: NIA
INITIAL DEPTH OF WATER: N/A FINAL DEPTH OF WATER: N/A
SOIL STRATA. STANDARD PENETRATION TEST
DEPTH SAMPLERS USCS DESCRIPTION LL PI CURVE
AND TEST DATA DEPTH N 10 30 50
0
SM Brown moist.medium dense SILTY
SAND with GRAVEL Gravel is fine and
subrounded Sand is primarily coarse
1 Non plastic
2
3
4 Excavation terminated at approximately
4 0 feet
5
6
7
8
9
10
No Groundwater Encountered ENVIROTECH ENGINEERING
This inlomwhon pertains only to this bonng and should not be
Geotechnical Engineering
interpreted as being indcrbve of the enhie site
Map Unit Description Alderwood gravelly sandy loam 15 to 30 percent slopes---Mason
County,Washington
Mason County, Washington
Ac—Alderwood gravelly sandy loam, 15 to 30 percent slopes
Map Unit Setting
National map unit symbol. 2t627
Elevation 0 to 1,000 feet
A1ean annual precipitation. 25 to 60 inches
A,fean annual air temperature: 46 to 52 degrees F
Frost-free period. 160 to 240 days
Farmland classification Farmland of statev,ide importance
Map Unit Composition
Alderwood and similar soils. 85 percent
Minor components: 15 percent
Estimates are based on observations descriptions. and transects of
the mapunit
Description of Alderwood
Setting
Landform Ridges.hills
Landform position(two-dimensional). Backslope
Landform position(three-dimensional). Side slope,nose slope.talf
Down-slope shape. Linear,convex
Across-slope shape Convex
Parent material Glacial drift and/or glacial outwash over dense
glaciomarine deposits
Typical profile
A-0 to 7 inches gravelly sandy loam
Bwl-7 to 21 inches very gravelly sandy loam
Bw2-21 to 30 inches: very gravelly sandy loam
Bg-30 to 35 inches very gravelly sandy loam
2Cdl-35 to 43 inches: very gravelly sandy loam
2Cd2-43 to 59 inches very gravelly sandy loam
Properties and qualities
Slope 15 to 30 percent
Depth to restrictive feature: 20 to 39 inches to densic material
Natural drainage class Moderately well drained
Capacity of the most limiting layer to transmit water(Ksat) Very
low to moderately low(0 00 to 0.06 in/hr)
Depth to water table: About 18 to 37 inches
Frequency of flooding: None
Frequency of ponding. None
Available water storage in profile. Very low(about 2.7 inches)
Interpretive groups
Land capability classification(irrigated): None specified
Land capability classification(nonirrigated) 4e
Hydrologic Soil Group: B
Natural Resources Web Soil Survey 12/10,'2018
�� Conservation Service National Cooperative Sod Survey Page 1 of 2
Map Unit Description Alderwood gravelly sandy loam, 15 to 30 percent slopes---Mason
County,Washington
Forage suitability group: Limited Depth Soils(G002XS301 WA),
Limited Depth Soils(G002XF303WA),Limited Depth Soils
(G002XN302WA)
Hydric soil rating, No
Minor Components
Everett
Percent of map unit. 5 percent
Landform. Kames,eskers.moraines
Landform position(two-dimensional). Backslope
Landform position(three-dimensional). Side slope
Down-slope shape: Convex
Across-slope shape Convex
Hydric soil rating No
Indianola
Percent of map unit. 5 percent
Landform' Eskers.kames.terraces
Landform position(three-dimensional) Tread
Down-slope shape. Linear
Across-slope shape Linear
Hydric soil rating No
Shalcar
Percent of map unit: 3 percent
Landform Depressions
Landform position(three-dimensional). Dip
Down-slope shape Concave
Across-slope shape Concave
Hydnc soil rating Yes
Norma
Percent of map unit, 2 percent
Landform Depressions.drainagevays
Landform position(three-dimensional) Dip
Down-slope shape Concave, linear
Across-slope shape Concave
Hydnc soil rating' Yes
Data Source Information
Soil Survey Area. Mason County,Washington
Survey Area Data. Version 14,Sep 10.2018
L S D,*, Natural Resources Web Sal Survey 12110/2018
Conservation Service National Cooperative Soii Survey Page 2 or 2
Map Unit Description:Everett very gravelly sandy loam,8 to 15 percent slopes---Mason
County Washington
Mason County, Washington
Eh—Everett very gravelly sandy loam. 8 to 15 percent slopes
Map Unit Setting
National map unit syrnbol 2t62b
Elevation 30 to 900 feet
Afean annual precipitation 35 to 91 inches
Afean annual air temperature 48 to 52 degrees F
Frost-bee period 180 to 240 days
Farmland classification Farmland of statewide importance
Map Unit Composition
Everett and similar sods 80 percent
Aftnor components 20 percent
Estimates are based on observations,descriptions,and transects of
the mapunit
Description of Everett
Setting
Landform Kames,eskers,moraines
Landform positron(two-dinmensional) Shoulder,footslope
Larx form position(three-dinmensional) Crest,base slope
Down-slope shape Convex
Across-slope shape Convex
Parent rnatenal Sandy and gravelly glacial outwash
Typical profile
Of-0 to 1 inches slightly decomposed plant material
A- i to 3 inches very gravelly sandy loam
Bw-3 to 24 inches very gravelly sandy loam
C1-24 to 35 inches very gravelly loamy sand
C2-35 to 60 inches extremely cobbly coarse sand
Properties and qualities
Slope 8 to 15 percent
Depth to restrictive feature More than 80 inches
Drainage class Somewhat excessively drained
Capacity of the most limiting layer to transmit water(Ksat) High
(1 98 to 5 95 in/hr)
Depth to water table More than 80 inches
Frequency of flooding None
Frequency of ponding None
Available water capacity Low(about 32 inches)
Interpretive groups
Land capability classificaton(irrigated) None specified
Land capability classification(nontingated) 4s
Hydrologic Soil Group A
iy+ Natural Resources Web Sal Survey 5i 13r2o21
Conservation Service National Cooperative Sal Survey Page I of 2
Map Unit Description Everett very gravely sandy loam.B to 15 percent slopes--Mason
County,Washington
Forage suitability group. Droughty Soils(G002XN402WA),
Droughty Soils(G002XF403WA),Droughty Soils
(G002XS401WA)
Other vegetative classification. Droughty Soils(G002XN402WA),
Droughty Soils(G002XF403WA),Droughty Soils
(G002XS401 WA)
Hydric sod rating No
Minor Components
Alderwood
Percent of map unit. 10 percent
Larxiform Ridges,Mils
Landform position(two-dimensional) Shoulder
Landform positron(three-dimensional) Nose slope,tali
Down-slope shape.Linear,convex
Across-slope shape Convex
Hydric soil rating No
Indianola
Percent of map unit 10 percent
Larxiform Eskers,kames,terraces
Landform position(three-dimensional). Riser
Down-slope shape.Linear
Across-slope shape Linear
Hydric soil rating No
Data Source Information
Soil Survey Area Mason County,Washington
Survey Area Data. Version 16,Jun 4 2020
i sr� Natural Resources Web Soil Survey 511312021
Conservation Service National Cooperative Sal Survey Page 2 of 2
Map Unit Description Rough broken land---Mason County,Washington
Mason County, Washington
Rb—Rough broken land
Map Unit setting
National map unit symbol 2hmr
Elevation 0 to 710 feet
A4ean annual precipitation 50 Inches
Mean annual an temperature 50 degrees F
Frost-free period 180 days
Farmland classification Not prime farmland
Map Unit Composition
Rough broken land and similar sods 100 percent
Estimates are based of observations,descriptions,and transects of
the mapunit
Description of Rough Broken Land
Typical profile
Hf-0 to 4 inches gravelly loam
H2-4 to 43 inches very gravelly loam
H3-43 to 60 inches very gravelly sandy loam
Properties and qualities
Slope 45 to 90 percent
Depth to restrictive feature 20 to 72 inches to densic material
Drainage class Well drained
Capacity of the most limiting layer to transmit water
(Ksat) Moderately high to high(0 57 to 1 98 inihr)
Depth to water table More than 80 Inches
Frequency of flooding None
Frequency of ponding Noe
Available water capacity Low(about 3 2 inches)
Interpretive groups
Land capability classification(it"gated) None specified
Land capability classification(nonrrrigated) 7e
Hydrologic Soil Group B
Hydrrc soil rating No
Data Source Information
Soil Survey Area Mason County,Washington
Survey Area Data Version 16.Jun 4 2020
'I%.N Natural Resources Web Sal Survey 5/13/2021
�� Conservation Service National Cooperative Soil Survey Page 1 of I
WATER WELL REPORT CURRENT
Origisd d V apy-Ecobgy;I""py=ewna,a^'copy-driller Notice of Intent No.W 236857
tL Construction/Decommission Cx"in circle) Unique Ecology Well ID Tag No. tips 690
3 Q Construction Water Right Permit No.
y O Decommission ORIGINAL INSTALLATION Notice Property Owner Name
2 ouo i 0 of Intent Number Well Street Address t/fSYL
C PROPOSED USE: ) O"waK O Irtdusteiat 0 Mutfcfpat e
O o DeW.1, i7 Imsidioet o Teat Wen O Odar City Tahuya County Masm
C Locatioij 1/4.1/4[Ll/4 Sec�Twn22 R�WEwm -,s,
0 TYPE OF WORK: Owmr's number of wdl Winds:it=one)
wwst
)O New wdl O Recoedilamd Mahod O Dug O Bortd O Drivent11 o Deepened R Cable R Rary o resed Lat/Long(s,I,r Lat Deg _ Lat Min/Sec
L. DIMENSI6NS:DusWerofwell_6 inches,drilled 700_n - Still REQUIRED) Long Deg LongMin/Sec
O nepa ofconeted w 00 Aell 2
C p CONSTRUCTM DETAILS Tax Parcel No. 32212-76-00010
Ciia t 6i Welded F" OWn.fern It to-4"__a
S testified: fi L,m msullee Dun aom n to A CONSTRUCTION OR DECOMMISSION PROCEDURE
err O lwtu cd dam.aom A to fl.
a_ Perhrattewi O Yes M No Fomw1 m:Deuribe by color,dwacta,size ofhtamul sM arvcturt,and the kind aid
Type of pMorator wed nslure of the materiat m each swum pewmed,with at teals om a"ter each change of
information USE ADDITIONAL SHEETS IF NECESSARY.
SIZE of perfs in by m and w orpau_from_ft.a A. aMTERIAI FROM 70
R Sem.01': it Yes O No j1 K-Pere Location 1-94
eo Maotifuum'sNatnc .Tnhncm Tcy soil
R Type ct-ai nl ssaa Model No.
Dan_-5_sla ata-42—feom ,y§ n a 296 n.
Diant. Sla sill from—T a.b fl. Brown trill
GmeMfte patted:O Yes 10 No O Siu o gwvellwd__
♦'Coll ~WipacedRum a.0 fl
3-ha Seal:xl Yes O No To whit depth__1 R A.
C Material used m sW APB-nni tP Brown till
` Did any strap co"n umssWc wtelt O Yes No
Type of water? _ Depth of stets
MHhod of sating ftrata on
i. PUMP:Mmufrchaet's Nuts
O Type m ih
Z -WATER LEVELS:Lattl-suhH elevation above mew see level a
static level i 11 n.below t p of wan Dam
Anesim piessuee �IN pa square inch Date
Anesiw wata is comolled by '
valve etc.
OWELL TESTS:Dawdown is amount water level is lowered below saus,level
Was a pump test made?M Yes O No if yes•by whom'
WQ YieldgL Imp-th 5 n.lowdown aria."'_-1 1.
YicW�r�_pl/inn wth r n eaweown.na—q—M
Yield W lmin with n lowdown after hn
O Rtl»vtrydeb tlriwr IYiM Qr rtm when 1Y/nfd
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a+ '
nit;m well k-1)
C Time WSW Level Time Water Level Tunt Wsw Level
al IU- 3-min. 11.1.4 L0_min-111
t+ —111.5 5-min.--"-fi-2 !
?L tsarler tat__gal h"n wnh n drawdown alley M.
z Aircat I tat
gWmin with stem so at A.fan M. �ry'tL 1!1119
d) Arta-11— &PM Dote of rGRI Cl .0 t„
Tanparsan of M._Wn a chemical analysis mde? (R Yea O No
sun DM 7130/08 Con~Da* R/1/n0
WELL CONSTRUCTION CERTIFICATION: I constructed and/or accept responsibility for construction of this well,and its compliance with all
Washington well construction standards. Materials used and the information reported above are true to my best knowledge and belief.
]p Ordla O Engineer O Trainer Name(Pn ) Drinmg Compaty Havel s [)Til ling
DrinulEngnaer/rraimeSiptax—z 12YG Add= 340 NE Qayfs Farm RA
Drdla or Rama Lionise No ln,6v V
City,Stria Zip Belfai r+ WA 9RS2R
1iTRAINEE, cmnsactor s
OriMer•s fjteaed Nan. DAVISDI 11 OOA Aug. 8
Aegisgatson No_-------_.._----___—__—Due �'
Driiki aSipaan Ecologyis Equal Employer
F9 OPP�+fi'Empl Y
ECY 050.1.20(Rev V03) The Department of Ecology does NOT warranty the Data and/or Information on this Well Report.