HomeMy WebLinkAboutGEO2018-00041 - GEO Geological Review - 2/15/2018 GEOLOGICAL ASSESSMENT
1 H 1 E MOUNTAIN VIEW DRIVE
ALLYN, WASHINGTON
PREPARED FOR
JILL & LARRY SEYMOUR
BY
ALL AMERICAN GEOTECHNICAL INC.
OLYMPIA, WASHINGTON
FEBRUARY 15, 2018
GEO 1/018
Mason County Review Checklist
For a Geological Assessment
Instructions:
This checklist is intended to assist Staff in the review of a Geological Assessment. The Assessment is reviewed for
completeness with respect to the Resource Ordinance. If an item is found to be not applicable, the report should
explain the basis for the conclusion. The Assessment is also reviewed for clarity and consistency. If the drawings,
discussion, or recommendations are not understandable, they should be clarified. If they do not appear internally
consistent or consistent with the application or observations on site, this needs to be corrected or explained. If
resolution is not achieved with the author, staff should refer the case to the Planning Manager or Director.
Applicant's Name: �(Kies ,� G
Permit#: qarcel#'s: I Z Z Zc) - S V Oa &0
Date(s)of the Document(s) reviewed: M
) L
1. A discussion of geologic conditions in the general vicinity of the proposed development, with geologic unit
designation based on referenced maps.
OK?_ Comment:
2. (a) A discussion of the ground water conditions at the site,
OK? �N—Comment:
(b) A discussion of the estimated depth to water,
OK? Comment:
(c) A discugsion of the quantity of surface seepage,
OK? Comment:
(d) A discussion of the upslope geomorphology,
OK?�_Comment:
(e) A discussion of location of upland waterbodies and wetlands.
OK? Comment:
3. The approximate depth to hard or dense competent soil, e.g. glacial till or outwash sand.
OK?�. Comment:
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 ovement, etc.).
OK? Comment:
5. A discussion of the history of landslide activity in the vicinity, as available in the referenced maps and records.
OK? N _Comment:
6. An opinion on whether the proposed development is within the landslide hazard area or its associated buffer or
setback and he potential for landslide activity at the site in light of the proposed development.
OK? Comment:
7. A recommendation by the preparer whether a Geotechnical Report should be required to further evaluate site
condition d the proposed development of the subject property.
OK? Comment:
8. If the presence of a hazard is determined within 300 feet of the proposed development, then the following are
delineated on a geologic map/site map:
Page 1 of 2 Form Effective June 2008
(a) the area of the proposed development,
OK? Comment:
(b) the boundaries of the landslide hazard area(top, both sides, and toe),
OK?�_Comment:
(c) the associated buffers (top, both sides, and toe)
OK? Comment:
(d) building or other setbacks (top, both sides, and toe).
OK?_�Comment:
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.
OK?�_Comment:
Are the Documents signed and stamped? By whom? �1AS I^ate
License#: 2 L License type:
FIRST REVIEW Approved ❑ Need more info.
If not approved, what is the next action/recommendation for further action?
Reviewed by Y ",-' , on L�U n . Time spent in review: Z:S ly�w
SECOND REVIEW/UPDATE ❑ Approved ❑ Need more info.
If not approved, what is the next action/recommendation for further action?
Reviewed by on . Time spent in second review:
THIRD REVIEW/UPDATE ❑ Approved ❑ Need more info.
If not approved, what is the next action/recommendation for further action?
Reviewed by on . Time spent in third review:
Disclaimer. Mason County does not certify the quality of the work done in this Geological Assessment
Page 2 of 2 Form Effective June 2008
MASON COUNTY
COMMUNITY SERVICES Geological Assessment
Building.Phrorn m
q.E—fannwntal Hcalth,Community I Irelrt: 9
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 Intemational Rosidential 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 Intemationai
Building Code Section for Foundations on or adjacent to slopes.
Applicant/Owner US Ventures LLC (BLD2018-00698) Parcel# 12220-51-00020
Site Address 181 E Mountain View Dr, Allyn WA 98524
(1) A discussion of geologic conditions in the general vicinity of the proposed development, with geologic unit
designation based on referenced maps.
Located on page(s) to -
(2) (a) A discussion of the ground water conditions at the site.
Located on page(s) P
(b) A discussion of the estimated depth to water,
Located on page(s)
(c) A discussion of the quantity of surface seepage.
Located on page(s) 9-
(d) A discussion of the upslope geomorphology.
Located on page(s)
c.
(e) A discussion of location of upland waterbodies and wetlands
Located on page(s)
(3) The approximate depth to hard or dense competent soil, e.g. glacial till or outwash sand
Located on page(s) Q
(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)
(5) A discussion of the history of landslide activity in the vicinity, as available in the referenced maps and records.
Located on page(s) 1
(5) 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) 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.
Rev. February 2018
Located on page(s)
(8) if the presence of a hazard is determined within 300 feet of the proposed development, then the following are
delineated on a geologic map/site map:
a) the area of the proposed development,
Located on Map /s) y
(b) the boundaries of the landslide hazard area (top, both sides, and toe),
Located on Map(s) i�
(c) the associated buffers (top, both sides, and toe).
Located on Map(s) I iJ
(d) building or other setbacks (top, both sides, and toe).
Located on Map(s) lv
(g) 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) �l�i y" y --
I Cc)/- I rs �G�l y� hereby certify under penalty of perjury that 1 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 1_
s 2 (' �� and entitled
�i Y+vr �Areas
meets all the
requirements of the Mason County Resource Ordinance, Geologicall Hazardous ection. 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.
of Wasfi;,�
Engineering Geobgisl
2439
eased Geo�o
(Signature and Stamp) Curtis Dean Cushman
Page 2 of 2
Disclaimer: Mason County does not certify the quality of the work done in this Geological Assessment.
7IL
ALL AMERICAN GEOTECHNICAL INC.
CONTACT INFORMATION
PREPARER INFORMATION
GTL PROJECT NUMBER: AAG18-009
CONTACT: CURTIS D.CUSHMAN
ADDRESS: 8947 BUTTONWOOD LANE NE
OLYMPIA,WASHINGTON 98516
TELEPHONE: (360)491-5155
EMAIL ADDRESS: CURTIS.CUSHMAN@COMCAST.NET
CLIENT INFORMATION
CLIENT: JILL&LARRY SEYMOUR
CLIENT CONTACT: SAME
TELEPHONE: (360)801-2690, (360)731-3868
BILLING ADDRESS: P.O.BOX 1153
ALLYN,WASHINGTON 98546
SITE ADDRESS: 181 E MOUNTAIN VIEW DRIVE
ALLYN,WASHINGTON 98584
PARCEL: 12220-51-00020
GPS LOCATION: N47°22'47.64" W122°50'20.42"
8947 Buttonwood Lane NE Olympia, WA 98516 2
Phone#: (360)491-5155 Cell#: (360)481-6677
AAG18-006
ALL AMERICAN GEOTECHNICAL INC.
SCOPE OF UNDERSTANDING
.TILL&LARRY SEYMOUR
P.O.Box 1153
ALLYN,WASHINGTON 98546
FEBRUARY 14,2018
RE: GEOLOGIC ASSESSMENT
181 E.MOUNTAIN VIEW DRIVE
ALLYN,WASHINGTON 98584
PARCEL#12220-51-00020
N470 22' 47.64". W1220 50'20.42"
Dear Jill and Larry Seymour:
As per your request, we have conducted a geological assessment for the above-mentioned parcel. The
results of this investigation are to be found in the following assessment. We have provided two copies
for your review and distribution.
We appreciate this opportunity to be of service to you and we look forward to working with you in the
future. If you have any questions concerning the above items, the procedures used, or if we can be of any
further assistance please call us at the phone numbers listed below.
Respectfully Submitted,
ALL AMERICAN GEOTECHNICAL
°E Wash;�
r0
v
ngineenng Geologist t
�C 2439 �y
Curtis D Cushman
eased Gte° Senior Engineering Geologist
Curtis Dean Cushman
8947 Buttonwood Lane NE Olympia,WA 98516 3
Phone#: (360)491-5155 Cell#: (360)481-6677
AAG18-006
ALL AMERICAN GEOTECHNICAL INC.
TABLE OF CONTENTS
CONTACTINFORMATION.......................................................................................................................................................2
SCOPEOF UNDERSTANDING.................................................................................................................................................3
TABLEOF CONTENTS..............................................................................................................................................................4
PURPOSEAND LOCATION...............................................................................................................................................................5
SITECONDITIONS...........................................................................................................................................................................6
GEOLOGICCONDITIONS(1).....................................................................................................................................6
GEOSEISMICSETTING..............................................................................................................................................7
SITESOILS...............................................................................................................................................................7
GROUND WATER CONDITIONS(2a).........................................................................................................................9
DEPTHTO WATER(2b)...........................................................................................................................................9
QUANTITYOF SEEPAGE(2C)....................................................................................................................................9
UPSLOPEGEOMORPHOLOGY(2d)...........................................................................................................................9
UPLAND WATER BODIES AND WETLANDS(2e)......................................................................................................9
DEPTH TO COMPETENT SOIL(3)..............................................................................................................................9
PASTSLOPE INSTABILITY(4)..................................................................................................................................9
HISTORY OF LANDSLIDE ACTIVITY(5)...................................................................................................................9
POTENTIAL FOR LANDSLIDE ACTIVITY(6)............................................................................................................ 10
GEOTECHNICAL REPORT RECOMMENDATION(7)................................................................................................. 10
LANDSLIDE HAZARD DETERMINATION(8)(a-d)................................................................................................... 10
SITEMAP(9)......................................................................................................................................................... 10
CONCLUSIONSAND OPINIONS......................................................................................................................................................10
REPORT LIMITATIONS AND GUIDELINES FOR USE................................................................................................ 11
CONTRACTORS ARE RESPONSIBLE FOR SITE SAFETY ON THEIR OWN CONSTRUCTION PROJECTS........................ 11
PLEASE READ THESE PROVISIONS CLOSELY......................................................................................................... 11
APPENDIX....................................................................................................................................................................................12
NEARBYWELL LOG.............................................................................................................................................. 13
FIGURE1.VICINITY MAP...................................................................................................................................... 14
FIGURE2:GENERAL PLAN.................................................................................................................................... 15
FIGURE 3.SEDIMENT AND EROSION CONTROL PLAN ........................................................................................... 16
8947 Buttonwood Lane NE Olympia, WA 98516 4
Phone#: (360)491-5155 Cell#: (360)481-6677
AAG18-006
ALL AMERICAN GEOTECHNICAL INC.
PURPOSE AND LOCATION
This report summarizes the results of All American Geotechnical (AAG) consulting services for the
proposed residence on the above-noted property (see Figure 2 Site Map below). The residence will be
constructed on a 0.3 acre lot. The site will have all services including water, sewer, electric, and
communications. The site is located directly on East Mountain View Drive, which is off of East
Lakeland Drive from State Route 3. The 0.3-acre parcel is rectangular in shape. The proposed building
site is the western portion of the property as indicated on the site map. Access to the residence will be via
the driveway to the south of the proposed residence, located at about the 210-foot contour. The site is
approximately 0.5 miles west of downtown Allyn, Washington.
The assessment has been commissioned by owners Jill and Larry Seymour (clients). Our understanding
of the project is based on our discussions with the clients. We understand that the site is to be developed
with a new home. No major grading is expected for this development. The site is serviced by
community water and sewer; therefore, a well buffer is not included on the drawing (see Figure 2). The
approximate layout of the site is shown on Figure 2. The site was visited by Curtis D Cushman L.E.G.
And Blaise Jelinek E.I.T. of All American Geotechnical (AAG) on January 30, 2018. Mr. Seymour was
on site at the time of the visit.
ell
74
r �
ur�k'Y _ ,
No slope stability analysis was prepared for this property as no slopes on or near the property within
300'of the development met the criteria of a 40% slope with vertical relief of ten or more feet or any of
the other criteria requiring a geotechnical report (17.01.100 Landslide Hazard A.l.a. to f.) This was
verified at the time of the AAG site visit. Because of the overall slope and the lack of a landslide hazard
area, Mason County requires that a geological assessment be prepared in accordance with the Critical
Areas Ordinance.
The Mason County Resource Ordinance Geologically Hazardous Areas (12-27-2006; revised June 16, 2009)
contains the following:
17.01.100 Landslide Hazard Areas
E. Special Reports
8947 Buttonwood Lane NE Olympia,WA 98516 5
Phone#: (360)491-5155 Cell#: (360)481-6677
AAG18-006
ALL AMERICAN GEOTECHNICAL INC.
1.Applicability
Category d. Development proposed within 300 feet of areas with slopes between 15 percent (8.5
degrees) and 40 percent (21.8 degrees) will require a Geological Assessment, and may further
require a Geotechnical Report upon the findings of the assessment.
SITE CONDITIONS
The proposed building site is located in an area of sparse residential development in Mason County,
Washington.
The visit by AAG was a site investigation by Curtis D Cushman L.E.G and Blaise Jelinek E.I.T. The
purpose of a site investigation is to physically observe the property and adjacent properties to identify any
recognized geologic conditions. Visual observations were documented. Site-specific features were
identified, vegetation noted, and local geology noted.
No evidence of deep-seated slope instability was observed onsite. The trees seen on site are straight and
vertical.
GEOLOGIC CONDITIONS(1)
The slope material is composed of glacial material. The following is the most recent mapping.
The Geologic Map of the Belfair 7.5-minute Quadrangle, Mason, Kitsap, and Pierce Counties
Washington by Logan, T., et al., July 2009; Washington Department of Geology and Earth Resources
Map Open File Report 2009-7, has mapped the geology as Vashon Till (Qgt). The map legend reads:
Vashon till—Unsorted, unstratified (but locally banded) mix of clay, silt, sand, and
gravel, typically supported by a sandy matrix; mostly gray but locally ranging to tan,
light brown, or orange; typically unweathered; lodgment till compact, with well-
developed facies resembling concrete, but near the surface commonly hackly and (or)
looser and covered by 1 to 6 ft of loose ablation till; deposited directly by glacial ice and
commonly includes clasts or clumps plucked from underlying units. Clasts are commonly
striated and faceted, with angular or rounded edges. Boulders are generally sparse
within the till but large (erratic) boulders of plutonic or metamorphic rock are common
on till surfaces. Some exposures include interbands and lenses of sand and gravel,
locally with shears and joints. Till forms a locally patchy and seemingly randomly
distributed cover up to a several tens of feet thick, with a thickness of 5 to 20 ft most
common. It typically dominates, but is also locally discontinuous on, fluted surfaces,
with individual drumlins measuring 0.1 to 0.3 mi wide by 0.8 to 1.3 mi long and the long
axis aligned with the direction of ice flow
Field investigation confirms this geology is correct. This unit will support the proposed structure.
8947 Buttonwood Lane NE Olympia, WA 98516 6
Phone#: (360)491-5155 Cell#: (360)481-6677
AAG 18-006
ALL AMERICAN GEOTECHNICAL INC.
GEOSEISMIC SETTING
The Liquefaction Susceptibility Map of Mason County, Washington by Palmer, Magsino, Poelstra,
Bilderback, Folger, and Niggemann (September 2004) maps the site area as having a very low
liquefaction potential.
The Site Class Map of Mason County, Washington by Palmer, Magsino, Bilderback, Poelstra, Folger, and
Niggemann (September 2004) maps the site area as site class C. Site class C is a very dense soil or soft
rock.
The site is approximately one mile north of a mapped branch of the Tacoma Fault commonly known as
the Catfish Lake Fault or the Catfish Lake Scarp. The site is on the upthrown side of a reverse fault
dipping to the north. The displacement is minor, but sufficient to dam north-flowing streams into a few
small lakes, notably the eponymous Catfish Lake.
The displacements that are visible enough to be mapped are likely relief features of the east-west Tacoma
Fault. The Vaughn Quadrangle map indicates a major event, sufficient to dam Catfish Lake but of
unknown intensity, taking place approximately 1200 years b.p. The FEMA Hazus methodology as cited
in the DNR on-line Understanding Earthquake Hazards in Washington State is for an M7.1 scenario.
This scenario is for the entire fault system as currently understood with the brunt of the structural damage
in King, Pierce, Mason, and Thurston Counties. Thus the concern is regional and not localized upon the
fault trace at Allyn, although movement may occur anywhere along the fault trace.
According to the Seismic Zone Map of the United States contained in the 2006 International Building
Code (IBC), the project site is located where the maximum spectral response acceleration is 40 percent of
gravity(g). The Geoseismic section has been included because of the proximity to the mapped fault.
We recommend following seismic factors for design purposes.
• Site Class: C (Soft Rock)
• Spectral response acceleration,short period(SMs): 1.413g(Fa= 1.05)
• Spectral response acceleration, I-second period(Smi): 0.738g (F,= 1.55)
• Peak Ground Acceleration(PGA) 0.426g
SITE SOILS
The soil on the site is Alderwood gravelly sandy loam (Ac). This classification is from the USDA Web
Soil Survey and is described as follows.
Ac—Alderwood gravelly sandy loam, 15 to 30 percent slopes
Map Unit Setting
National map unit symbol: 2t627
Elevation: 0 to 1,000 feet
8947 Buttonwood Lane NE Olympia,WA 98516 7
Phone#: (360)491-5155 Cell#: (360)481-6677
AAG 18-006
ALL AMERICAN GEOTECHNICAL INC.
Mean annual precipitation: 25 to 60 inches
Mean annual air temperature: 46 to 52 degrees F
Frost-free period: 160 to 240 days
Farmland classification: Farmland of statewide importance
Map Unit Composition
Alderwood and similar soils: 85 percent
Minor components: 15 percent
Estimates are based on observations,descriptions, and transects of the map unit.
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
2Cd1 - 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)
The Alderwood soil is typical of the soils derived from glacial deposits. It is moderately well-drained,
not subject to flooding and is suitable for construction although, as a general rule, the development of
footings removes the soil to the underlying firm and unyielding glacial till.
8947 Buttonwood Lane NE Olympia,WA 98516 8
Phone#: (360)491-5155 Cell#: (360)481-6677
AAG18-006
ALL AMERICAN GEOTECHNICAL INC.
GROUND WATER CONDITIONS(2a)
No evidence of active surface erosion was observed. No surface water flow was observed onsite. No
ponding of water was observed throughout the site. No seeps or springs were observed on site.
DEPTH TO WATER(2b)
A nearby well struck a sand and gravel layer at the -180-foot depth and reported the static water at -
120.5-feet. This is likely similar to the profile on-site.
QUANTITY OF SEEPAGE(2e)
Groundwater seepage was not observed at the proposed building location or throughout the site. Wetland
vegetation was not observed at the proposed building location or throughout the site.
UPSLOPE GEOMORPHOLOGY(2d)
The upslope above the building site rises less than 20 %. This rises eventually to a mapped height of a
knoll 240 feet located 150 feet to the west-northwest. This does not threaten the building site.
UPLAND WATER BODIES AND WETLANDS(2e)
Anderson Lake is approximately 1400 feet to the west of the site with drainage flow to the north. The
site is on the top of a drumlin ridge and higher than the lake or any other nearby water bodies.
DEPTH TO COMPETENT SOIL(3)
The soil overall is firm as it is related to the underlying glacial till.
PAST SLOPE INSTABILITY(4)
AN._:N-&ww 7. "All
No indication of past instability was discerned at
the proposed building location. There was no
t
nearby indication of slope instability
04*
HISTORY OF LANDSLIDE ACTIVITY(5)
There are no landslides near the site. No landslides
or mass wasting is mapped anywhere nearby r
There is no indication of any landslide forms or J
debris on the Interactive Geologic Map of '' t
i }
Washington LiDAR image on or around the site. : X
(Image from PSLC g47122d73.)
8947 Buttonwood Lane NE Olympia, WA 98516 9
Phone#: (360)491-5155 Cell#: (360)481-6677
AAG18-006
ALL AMERICAN GEOTECHNICAL INC.
POTENTIAL FOR LANDSLIDE ACTIVITY(6)
There will be no development on any LHA or associated buffer or setback. Landslide activity should not
be a factor in the development and the development should not create any landslide hazard.
GEOTECHNICAL REPORT RECOMMENDATION(7)
No geotechnical report will be needed for this project.
LANDSLIDE HAZARD DETERMINATION(8)(a-d)
No Landslide Hazards or associated buffers or setbacks were found present within 300 feet.
SITE MAP(9)
The site map is on Figure 2 at the end of this report.
CONCLUSIONS AND OPINIONS
The Tacoma Fault as seen in the Catfish Lake Scarp is not a major hazard to this single-family residence
if it is designed in accordance with the ground accelerations and in accordance with the site classification
as noted above. The clients should be advised of the potential hazard of a seismic event especially as in
the FEMA scenario and plan accordingly as should all residents and governmental agencies in the area.
The site is acceptable for the proposed development based on the requirements of Mason County. There
is no evidence of soil erosion or deposition onsite to suggest that the site should be included in the
Erosion Hazard Area designation. Proposed activities and site conditions for the development do not
warrant a more comprehensive Geotechnical Report. We recommend no further action is needed unless
areas of concern are unearthed during construction. To minimize erosion and sedimentation, we
recommend that vegetation be cultivated in areas around the building location following construction.
Grass should be used within 10 feet of footings and over any utilities. Otherwise, native vegetation is
preferred. The owner and builder must assure that silt and other debris during construction do not enter
into the local watershed. Silt fences or berms may be needed. See Figure 3 for general erosion notes and
for a silt fence. The tightline notes do not apply.
If there are any changes in the loads, grades, locations, configurations or types of facilities to be
constructed, the conclusions and recommendations presented in this report may not be fully applicable. If
such changes are made, we should be given the opportunity to review our recommendations and provide
written modifications or verifications, as appropriate.
The Mason County Code may require our firm to revisit the subject site prior to development
if six months have elapsed to ensure the conditions are in agreement with our original report.
8947 Buttonwood Lane NE Olympia, WA 98516 10
Phone#: (360)491-5155 Cell#: (360)481-6677
AAG 18-006
ALL AMERICAN GEOTECHNICAL INC.
REPORT LIMITATIONS AND GUIDELINES FOR USE
We have prepared this report for the exclusive use of Jill and Larry Seymour and their authorized agents
for the proposed building location in Mason County, Washington. This report does not specify setbacks
for: line-of-sight setbacks, FWHCA setbacks, eagle tree setbacks, wetland setbacks, or property line
setbacks. Within the limitations of scope, schedule and budget, our services have been executed in
accordance with generally accepted practices in the field of geotechnical engineering in this area at the
time this report was prepared. No warranty or other conditions, expressed or implied, should be
understood.
CONTRACTORS ARE RESPONSIBLE FOR SITE SAFETY ON THEIR OWN CONSTRUCTION PROJECTS
Our geotechnical recommendations are not intended to direct the contractor's procedures, methods,
schedule or management of the work site. The contractor is solely responsible for job site safety and for
managing construction operations to minimize risks to onsite personnel and to adjacent properties.
PLEASE READ THESE PROVISIONS CLOSELY
Some clients, design professionals, and contractors may not recognize that geoscience practices
(geotechnical engineering or geology) are far less exact than other engineering and natural science
disciplines. This lack of understanding can create unrealistic expectations that could lead to
disappointments, claims and disputes. All American Geotechnical includes these explanatory
"limitations"provisions in our reports to help reduce such risks.
The equipment, techniques and personnel used to perform an environmental study differ significantly
from those used to perform a geotechnical or geologic study and vice versa. For that reason, geotechnical
engineering or geologic reporting does not usually relate any environmental findings, conclusions or
recommendations; e.g., about the likelihood of encountering underground storage tanks or regulated
contaminants. Similarly, environmental reports are not used to address geotechnical or geologic concerns
regarding a specific project.
8947 Buttonwood Lane NE Olympia, WA 98516 11
Phone#: (360)491-5155 Cell#: (360)481-6677
AAG 18-006
ALL AMERICAN GEOTECHNICAL INC.
APPENDIX
Near by Well Log
Figure 1. Vicinity Map
Figure 2. Site Plan
Figure 3. Erosion and Sediment Control Plan
8947 Buttonwood Lane NE Olympia, WA 98516 12
Phone#: (360)491-5155 Cell#: (360)481-6677
AAG 18-006
ALL AMERICAN GEOTECHNICAL INC.
NEARBY WELL LOGI stertoomriw W 075736
De artm original f E Flint Copy with WATER WELL REPORT tPMQUE WELL I.D.. ACP 195
.
Department of ECOlogy
Second Copy—nv .a Copy STATE OFWASHINGTON
Third Copy—Deniers Can STATE Right Pww*No.
(1) OWNER: No.. Allyn Retreat W. S. __Aft. P.O. Box 347, Allyn, WA 98524
(2) LOCATION OF WELL: cmaty Mason NE va SW tw see 20 T 22 N.R 1W war.
Pa) STREET ADDRESS OF WELL*esiest kheay Masterson St. Allyn, WA 98524
(3) PROPOSED USE: Xl Domestic hldus&W ❑ Municipet ❑ (10) WELL LOG or ABANDONMENT PROCEDURE DESCRIPTION
❑ Migation
❑ DeWater Test Well ❑ Other ❑ iarnetion:040tibe by color,chanDole,alto of materiel and shucmrs,and shore thickness of shlAem
end the kind and netora or the meviei kr each stratum penetrated.whh at bad one entry br each
(4) TYPE OF WORK: ownw's number of wen chance or Information.
(If more than one)
MATERUL FROM TO
Abandoned❑ New well YJ Method:Dug Cl Bored❑
Deepened ❑ C"X1 Driven❑
Reconditioned❑ Rotary❑ Jarred❑ Brown conjzlomorate 0 4
(5) DIMENSIONS: Dlametwolweh 6 Inches.
Doted 197 reeL Depth of completed well 197 R. Brown n
(6) CONSTRUCTION DETAILS: Sand & jzravel 40 0
Casing Installed: 6 dam.hen 0 R b 192
Welded 3 Diem.ham R.10 R.
Liner Installed Sandy brown clay 70 100
Tlueadetl Mom.from a.a .a..
Perlonolens: yes❑ No[7
Type of Womtor used
SIZE of perforations in,by in. Sand & gXavel with water 80 197
p rforalionc from
parbralions from ft.to n.
perfowbns from h.to fL
Screens: yea No❑ con'
MmWloeMrory Name Cook n
Type 11ainl.ess„�4ire wrap Mom NO. L m
Diem. -5 sm nits 40 from 192 ft.10-10—IL —
Diem._Slot size icon ft to ft.
Gravel packed: Yee 0 No(2 Sits of gravel
Gmvel placed from 1L to ft
_ t
Surfacesaal: Yes Sty No Q To what depth? 1 ft
MNerialmdinaed Betonite
Did any strata contain unwahler water? Yea❑ No KI _
Type of water? Deph of sk
Mended of sealing aims oil
(7) PUMP: Mantua "wsName Jacuzzi
Type: Sub. H.P.
(a) WATER LEVELS: Land-sumdeen waves fro a wade s+erad 6 14.9 1t9. completed 2 ,19_
stem Iwr 120. h tmlw rsP a wall Dale
Aneelan preasum Its,pen mortars tYh Dote WELL CONSTRUCTOR CERTIFICATION:
Artesianwalerisc niledby I consYucted and/or accept responsibility for conal uction of this well,and its
(cap,va s,etc. compliance with all Washington wad eonsthwlfat standards.Materials used and
(g) WELL TESTS: Omwdown is amount velar Owl Is bowed below static hovel
Me Information reported sbovs are true to my beat knowledge and belief.
Was a pump l�osrtt�me&?yes® No[IIf yea,by whom4 NAME Davis I?ri 11 inrz
Yield:_60 gal.Imin.with 2_h.drawdown aBor hn. any
60 20 2 Address Bel'air WA 9 528
60 20 4
Rectory dah pine taken as zero when pump turned oft(water Iervei hero well h well ( ) License No.. 2062
top m water� i
Time Wabr Level Time Water Level Time Water Law[ '
,0 140-5t 3 min 194, 1 hr. 120.5' p ahaaacclarnntTn
min. ' 10 min. 123.5 No. )SL1T110DA Dare Tune tgQ�
2 min_ 128 15 m1L1,-123' (USE ADDRIONAL SHEETS IF NECESSARY)
Dated test
Bailer lest gal./min.with FL dmwdavn after hrs.
Ndest gaLfmin,with Blom sal at ft.for hr%. Ecology Is an Equal Opportunity and Affirmative Action employer.For spa•
Aneslan prey, g Pm Daft clal accommodation needs,contact the Water Resources Program at(206)
Temperature of water_Was a chemical analysh mad@? Yea El No❑ - 407-6000.The TOD number Is(206)407.6008.
8947 Buttonwood Lane NE Olympia, WA 98516 13
Phone#: (360)491-5155 Cell #: (360)481-6677
AAG 18-006
1
� � /ref -'' _ `.' - ', � •' r . ;
�AL � , is
iv,OFF]
:•� i 1 111 • • • : •
ALL AMERICAN GEOTECHNICAL INC.
FIGURE 2: GENERAL PLAN
8947 Buttonwood Lane NE Olympia, WA 98516 15
Phone#: (360)491-5155 Cell#: (360)481-6677
AAG18-006
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NOTES
This is not a survey. This map is a presentation of t
165'
information from county, state, and federal agencies,
t
client provided information, and onsite observations; ft sidelot Buffer
for discussion purposes of the report with which this
t
map is included.
t Sample Silt Fence
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Street Setbac As Needed
�
This site is serviced by a community water supply and 20 ft
community septic. A (18.3 min) 55' X 80'
cc
o Building Envelope
e
Site Soil w ,ypo
0
Alderwood gravelly sand loam
15 to 30 percent slope
Sample
SCALE 1" = 20'
Driveway S ft Sidelot Bz er
C.I. = 20'
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0 10 20 30 40 164 '
Site Geology
t
of Wash��
Qgt --Vashon Till
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Engineering Geobgiet
/C 2439 �5
Sed Ge o
F-
11b
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Curtis Dean Cushman
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All American Geotechnical,Inc. Project Drawn By: Site Plan Permit Number: Parcel Number: 12220-51-00020 Figure
8947 Buttonwood Lane NE Number: BWJ 2/6/18 Proposed Home
Olympia,Washington 98516 AAG18-009 Allyn,WA Applicant Name: Jill&Larry Seymour Site Address: 181 E Mountain View Drive 2
ALL AMERICAN GEOTECHNICAL INC.
FIGURE 3.SEDIMENT AND EROSION CONTROL PLAN
8947 Buttonwood Lane NE Olympia, WA 98516 16
Phone#:(360)491-5155 Cell#: (360)481-6677
AAG18-006
FILTER FABRIC MATERIAL 60'WIDE ROLLS
USE STAPLES OR WIRE RING TO ATTACH
FABRIC TO WIRE
2'X2'X14 GAUGE WIRE
FABRIC OR EQUIVALENT
GENERAL EROSION CONTROL NOTES:
2'-0" : : : : 1. EROSION CONTROL MEASURES SHALL BE IN PLACE PRIOR TO THE
BEGINNING OF CONSTRUCTION. THE PROJECT ENGINEER AND THE COUNTY
5'-0" /�\ D SURFACE ///A\\: : SHALL INSPECT AND APPROVE THE INSTALLATION OF 1/2 INCH MINIMUM DIAMETER STEEL ROD
EROSION CONTROL MEASURES PRIOR TO BEGINNING CONSTRUCTION. (STRAP)CLAMPED SECURELY TO PIPE
2'6• 2. EROSION CONTROL MEASURES ARE NOT LIMITED TO THE ITEMS
6'MAX ON THIS PLAN. THE CONTRACTOR IS RESPONSIBLE FOR THE CORRUGATED TIGHTLINE 4 INCH
/ INSTALLATION AND MAINTAINANCE OF ALL EROSION CONTROL MEASURES. MINIMUM,6 INCH SUGGESTED
,I NO SILTATION OF EXISTING OR PROPOSED DRAINAGE FACILITIES
ads.
SHALL BE ALLOWED. CARE SHALL BE TAKEN TO PREVENT MIGRATION •»^` L'QR 'Iv%,
2'X4•WOOD POSTS,STANDARD OR BURY BOTTOM OF FILTER OF SILTS TO OFF SITE PROPERTIES. ?,:=-.-" '
Af
BETTER OR EQUAL ALTERNATE: MATERIAL IN 8•X12'TRENCH Sp 10F
STEEL FENCE POSTS 3. THE CONTRACTOR SHALL MAKE DAILY SURVEILLANCE OF ALL EROSION ;»=� =`•`' �- NG T
CONTROL MEASURES AND MAKE ANY NECESSARY REPAIRS OR ADDITIONS ;�,;;<; �:'.•�:._:.=' ;-,�. ' p>�.,_
TO THE EROSION CONTROL MEASURES. THE CONTRACTOR SHALL PROVIDE
ADDITIONAL EROSION CONTROL MEASURES AS DETERMINED NECESSARY
BY THE COUNTY INSPECTOR AND/OR THE PROJECT ENGINEER. FAILURE
FILTER FABRIC 6" TO COMPLY WITH ALL LOCAL AND STATE EROSION CONTROL '�q�:::���:�'.-_*.:.�< •::�:':�:-'-:��;Yi}, r��:r,=�,
REQUIREMENTS MAY RESULT IN CIVIL PENALTIES BEING LEVIED
2'X2'X14 GAUGE WIRE AGAINST THE CONTRACTOR AND/OR PROJECT OWNER.
FABRIC OR EQUNALENT
GROUNGROUND SURFACE 5'-0' 4. DURING THE WET SEASON(NOVEMBER TO MARCH)ALL DISTURBED SOILS •=.4•:;._:;�,,,:_.�.,:• -�,; ;.,;,;;.1_,,,�.. -i};.�•n;:}`;�;'•
D SURFACE 5'-0' i;^>` „�.::.c�t;�:'•�;`_'''.:.._..r,:r�.�.,�.... .,'_;t•.`•;°.>.:,:r..`
SHALL BE STABILIZED WITHIN 48 HOURS AFTER STOP OF WORK. EROSION ..ti:•^,,:a_:x n 4`_�.;_,..:.^rye-; r}�a;:,;;. .
CONTROL MEASURES SHALL INCLUDE,BUT NOT BE LIMITED TO, "�ri.: �•'`- :�: =' f ti;::y<�j'
PROVIDE ACK 1/2'WASHED COVERING THE EFFECTED AREA INCLUDING SPOIL PILES WITH
GRAVEL BACKFILL IN TRENCH 12• _ _ ';..•-':•;
PLASTIC SHEETING,STRAW MATTING,JUTE MATTING,STRAW MULCH, •�"� S""r-''''s ' '�:''
AND ON BOTH SIDES OF FILTER -:�?.r,�,.•' '
FENCE FABRIC ON THE SURFACE 8"MIN OR WOOD CHIPS. SEEDING OF THE DISTURBED AREAS SHALL TAKE "~•``. "'=
PLACE AS WEATHER PERMITS. TIGHTLINE ANCHORED WITH TWO,
2'X4'WOOD POSTS 5. ALL SEEDED OR SODDED AREAS SHALL BE CHECKED REGULARLY 3 FOOT REBAR LENGTHS OR BOLTS.
ALT:STEEL FENCE POSTS TO MAKE SURE VEGETATIVE COVERAGE IS COMLETE. AREAS SHALL BE
REPAIRED,RESEEDED,AND FERTILIZED AS REQUIRED.
FILTER FABRIC FENCE NOTES:
1. FILTER FABRIC SHALL BE PURCHASED IN A CONTINUOUS ROLL CUT TO 6. TRACKING OF SOIL OFFSITE WILL NOT BE ALLOWED. IF ANY SOIL IS
THE LENGTH OF THE BARRIER TO AVOID USE OF JOINTS.WHEN JOINTS TRACKED ONTO A COUNTY STREET,IT SHALL BE REMOVED BY THE END
ARE NECESSARY,FILTER CLOTH SHALL BE SPLICED TOGETHER ONLY AT OF THAT WORKING DAY. ANY FURTHER TRACKING OF MUD WILL THEN
A SUPPORT POST WITH A MINIMUM 6-INCH OVERLAP AND SECURELY BE PREVENTED BY SWEEPING OR WASHING OF THE VEHICLES TIRES
FASTENED AT BOTH ENDS TO THE POST. BEFORE DRIVING ON A COUNTY STREET.
2. POSTS SHALL BE SPACED A MAXIMUM OF 6 FEET APART AND DRIVEN 7. NO MORE THAN 500 LF OF TRENCH ON A DOWNSLOPE OF MORE THAN 5
SECURELY INTO THE GROUND(MINIMUM OF 30 INCHES). PERCENT SHALL BE OPENED AT ONE TIME.
3. A TRENCH SHALL BE EXCAVATED APPROXIMATELY 8 INCHES WIDE AND 12
INCHES DEEP ALONG THE LINE OF POSTS AND UPSLOPE FROM THE BARRIER. 8. EXCAVATED MATERIAL SHALL BE PLACED ON THE UPHILL SIDE OF TRENCHES. FLARE END SECTION
y�4. WHEN STANDARD STRENGTH FILTER FABRIC IS USED,A WIRE MESH
9. TRENCH DEWATERING DEVICES SHALL BE DISCHARGED IN A MANNER THAT WILL � QUARRY SPALL ' ' `'t':�•. -at=-
/ �-r;... _•:� �'�iif;:hs:,c�•;,s;
SUPPORT FENCE SHALL BE FASTENED SECURELY TO THE UPSLOPE SIDE NOT ADVERSELY AFFECT FLOWING STREAMS. DRAINAGE SYSTEMS OR OR ENERGY -:%';,f.;,•�_r:• ,F;t<<,•.
OF THE POSTS USING HEAVY-DUTY WIRE STAPLES AT LEAST 1 INCH OFFSITE PROPERTIES. � DISPERSION DEVICE -_ ;`.� :;,�<;v;=,:c;;-;�M� ;;�!u?::;:
LONG,TIE WIRES OR HOG RINGS. THE WIRE SHALL EXTEND INTO THE "•=e{c :_ x=?c; ;,... ::``• r'�"
TRENCH A MINIMUM OF 41NCHES AND SHALL NOT EXTEND MORE THAN 36 10.ALL STORM SEWER INLETS RECEIVING RUNOFF FROM THE PROJECT DURING
INCHES ABOVE THE ORIGINAL GROUND SURFACE. CONSTRUCTION SHALL BE PROTECTED SO THAT SEDIMENT-LADEN WATER GRASS-LINED SWALE SHOULD BE A
5. THE STANDARD STRENGTH FILTER FABRIC SHALL BE STAPLED OR WIRED WILL BE FILTERED BEFORE ENTERING THE CONVEYANCE SYSTEM. MINIMUM ONE FOOT WIDE AT THE
TO THE FENCE AND 20 INCHES OF FABRIC SHALL BE EXTENDED 11.ALL OFFSITE CATCH BASINS IMMEDIATELY ADJACENT TO THE SITE BOTTOM AND ONE FOOT DEEP WITH
INTO THE TRENCH.THE FABRIC SHALL NOT EXTEND MORE THAN 36 SHALL BE PROTECTED FROM SILTATION. A MAXIMUM SLOPE OF 5 PERCENT.
INCHES ABOVE THE ORIGINAL GROUND SURFACE. FILTER FABRIC SHALL
NOT BE STAPLED TO THE EXISTING TREES. 12.ALL DISTURBED AREAS SHALL BE SEEDED OR SODDED UPON COMPLETION MINIMUM 4 FEET
6.WHEN EXTRA-STRENGTH FILTER FABRIC AND CLOSER POST SPACING IS OF WORK. THE CONTRACTOR SHALL BE RESPONSIBLE TO ENSURE THAT LEVEL SECTION
USED,THE WIRE MESH SUPPORT FENCE MAP BE ELIMINATED,IN SUCH COMPLETE COVERAGE OF THE DISTURBED AREAS IS PROVIDED&THAT
A CASE,THE FILTER FABRIC IS STAPLED OR WIRED DIRECTLY TO THE GROWTH OF THE VEGETATION IS ESTABLISHED. GEOTEXTILE FABRIC
POSTS WITH ALL OTHER PROVISIONS OR ABOVE NOTES APPLYING.
13.CATCH BASINS SHALL TRAP SEDIMENT OR FILTER FABRIC MUST BE
7. FILTER FABRIC FENCES SHALL NOT BE REMOVED BEFORE THE UPSLOPE PLACED UNDER GRATE UNTIL VEGETATION IS ESTABLISHED.
AREA HAS BEEN PERMANENTLY STABILIZED.
8. FILTER FABRIC FENCES SHALL BE INSPECTED IMMEDIATELY AFTER EACH
RAINFALL AND AT LEAST DAILY DURING PROLONGED RAINFALL. ANY
REQUIRED REPAIRS SHALL BE MADE IMMEDIATELY.
All American Geotechnical, Inc. Drawn By: Erosion Control Notes 12220-51-00020
Proposed Single Family Permit Number: Parcel Number: Figure
8947 Buttonwood Lane NE J Pro p g y Home
B
Olympia,Washington 98516 Allyn,Washington Applicant Name: Jill&Larry Seymour Site Address: 181 E Mountain View Drive 3
Revisions: