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Nam Parcel# � BLD#��—��
Mason County
Department of Community Development
Small Parcel Stormwater Management Application/Worksheet (page 1 of 2)
Per Mason County Code,Title 14, Chapter 14.48 a stormwater site plan is required whenever a building application is
made for residential development, or redevelopment',with more than 2,000 square feet of impervious surface 2.
'Redevelopment means, on an already developed site,the creation or addition of impervious surfaces, structural development
including construction, installation or expansion of a building or other structure,and/or replacement of impervious surface that is not
part of a routine maintenance activity, and land disturbing activities associated with structural or impervious redevelopment.
2Common impervious surfaces include,but are not limited to,rooftops,walkways,patios,driveways,parking lots or storage areas,
concrete or asphalt paving,gravel roads,packed earthen materials,and oiled,macadam or other surfaces which similarly impede the
natural infiltration of stormwater. Open,uncovered retention/detention facilities shall not be considered as impervious surfaces.
Surface Type Length X Width = Area " All dimensions in feet
Buildings X
X = Measurements for buildings are taken at the
X _ perimeter of the farthest projections (example:
eaves/gutters)
X =
Driveways Xmr
=
-r M T"Sf drive begins at the right of way
Parking Areas
X avel or packed area per definition
above table
PatiosNllalks 41 =
01 Any paved, gravel or packed area per definition
above table
X =
Ionia
Others X
X
X =
If the Total Impervious Surface Area is LESS THAN 2000 Square Feet,please read,acknowledge and sign below.
Based Upon the information you have provided a Stormwater Site Plan IS NOT required for this development activity.
Owner/Builder/Agent Acknowledges that submission of inaccurate information may result in a stop work order or permit revocation.
Acknowledgement of such is by signature below. I declare that I am the owner,owner's legal representative,or the contractor.I further
ackno at t ation provided is accurate and employees of Mason County are granted access to the above-described
pro rty for vi and ins ection as may be required.
X Owner/ (nt/Contractor circle one)Date: A�R
If ZToktal Impe ous Surface Area is GREATER THAN 2000 Square Feet,please rea ,acknowledge and sign
the information provided on page 2 of 2.
Page 1 of 2
MASON COUNTY PERMIT NO.1I �a COL n4)c-i(A
BUILDING PERMIT APPLICATION
426 W. Cedar• P.O. Box 186, Shelton, WA 98584
Shelton (360) 427-9670 • Belfair (360) 275-4467 • Elma (360) 482-5269
On the web www.co.mason.wa.us
APPLICANT INFORMATIO CONTRACTOR I ORMATION —
Owner Ke t-{o S Company Name 'r e �EV7 L,yl'& o
Maili Address -7 T• Maili Add r ss C7
City 0 State Zip Code 0 City r2RState Zip Code
Phone Other Ph. Phone3(ct� Z`?S" L-2,?S/ Other Ph.
Lien/Title Holder Contractor Reg. Ste c lc LO Exp. a
E mail address E Mail Address (:�7t2 L) J i r)c h y'
Drivers Lic.# DOB Drivers Lic.# DOB
SEPTIC /WATER SYSTEM INFORMATION - Connect to New Septic Existing Septic
Connect to Water System Name of Water System
i Well Sewer System Name of Sewer System
PARCEL INFORM TION - 12 Digit Parcel No. �— Fire District
114
Legal Description o
j Site Address(Please O clude street narne, street nu er an city) 2- M Ella 1ACALM
Directions to site I^ �t *- / 1 '2 -t
Will timber be cut and sol parcel pr paration?Ye§-N,,
Is property within 200'of Saltwater Lake%-rn v��River River/Creek Pond
Wetland Seasonal Runoff Stream Slopes or Bluffs > 15%
Is this permit submittal the result of a Stop Work Notice,Correction Notice or other enforcement action?Yes/No
TYPE OF JOB - New Add Alt Repair Other PRIM Y RESIDENCE SEASONAL
Use of Building Describe Work t Looc>d PJAIe
No. of Bedrooms___ No. of Bathroom Square Footage- 1st Floor (C)3S' 2nd Floor `�
3rd Floor Basement Deck Covered Deck�Other Sq. ft.
Garage Attached Detach ! Carport Attached Detached
i
MANUFACTURED HOME INFORMATION - Make Model Year
Length Width Serial No. A No. of Bedrooms No. of Bathrooms
Type of Heat Purchase Price$ A I Replacement Unit? Yes/No
Installer Name Certification No.
OWNER/BUILDER Acknowledges submission of inaccurate information may result in a stop work order or permit revocation.
Acknowledgement of such is by signature below. I declare that I am the owner,owners legal representative,or the contractor. I further declare
that I am entitled to receive this permit and to do the work as proposed in the application. I declare that I have obtained the permission from all
the necessary parties. If permission is required from any easement holder or any other party in interest regarding this application or the work
proposed in the application, I have obtained permission from them to apply for this permit and conduct the work proposed. The owner or
agent on owners behalf, represents that the information provided is accurate and grants employees of Mason County access to the above
described property and structure for review and inspection.This permitlapplication becomes null &void if work or authorized construction is
not commenced within days or if construction work is suspended for a period of 180 days.PROOF OF CONTINUATION OF WORK IS BY i
MEAf� APROGR S I SPTION.INACTIVITY OF THIS PERMIT APPLICATION OF 180 DAYS WILL INVALIDATE THE APPLICATION.
X 7 Date: Z.3 C%
Owner/Owner epresenta /Co tractor indicate which one)
FOR OFFICIAL USE BEYOND THIS POINT Accepted b Date
DEPARTMENTAL REVIEW APPR VED DENIED NOTES
Building Department
Planning Department
Environmental Health Department 5
Fire Marshal
FEES
Buildin Permit Fee Site Inspection j
i
Plan Review Fee EH Review Fee
Plumbing & Base Fee 1124 ( PlanningReview Fee
Mechanical & Base fee Z 3 I . 4D Other
Wood/Gas/ Pellet Stove Fee State Fee
Violation Fee /vD ENr= Pre-Paid at Submittal
' Valuation $ /2� 0 /Z-. IS TOTAL FEES i
FORM MUST BE COMPLETED IN INK PERMIT NO. I JJ2
PLEASE PRESS HARD MASON COUNTY
PLUMBING/MECHANICAL PERMIT APPLICATION
426 W.Cedar•P.O. Box 186, Shelton,WA 98584
Shelton (360) 427-9670•Belfair(360)275-4467• Elma(360) 482-5269
On the web www.co.mason.wa.us
APPLICAPj INFORMATION CONTRACTOR R ATION t
Owner P �_, A54b S cu/ Company Name, � e1i )n�n�� G
Mailing Address Mailing Address
City State Zip Code City State Zip Code
Phone Other Ph Phone Other Ph.
Lien/Title Holder Contractor Reg.# Exp.
E mail address E Mail Address
Drivers Lic.# DOB Drivers Lic.# DOB
SEPTIC INFORMATION - Connect to New Septic Existing Septic Connect to Sewer System
Name of Sewer System
PARCEL INFORMATION - 12 Digit Parcel No. Z b— -- O cU O Fire District
Legal Description
Site Address (Please include street name, street number and city) b -Q&4 '^
Directions to site
Is property within 200'of Saltwater Lake River/Creek Pond
Wetland Seasonal Runoff Stream Slopes or Bluffs > 15%
TYPE OF JOB - New Add Alt Repair Other Use of Building
Location of Fixtures/Units- 1st Floor— 2nd Floor_ Basement Garage Closet
PLUMBING FIXTURES (Show Number of each) MECHANICAL UNITS
Type of Fixture No. of Fixtures Fees Fuel Type:Electric_ LPC Natural Gas_ Heat Pump_
Toilets � Furnace
BathNo.
Fees
Bathroom Sink
Bath Tubs HeaSpot
Vent Ft
Showers Spot Vent Fan �—
Water Heater Propane Tank
Clothes Washer Gas Outlets
Kithen Sinks Wood/Gas/PelletStove
Dishwasher Kitchen Exhaust Hood
Hosebibs Z Dryer Vent
Other La&4&%J►� Other
Base Fee Base Fee
TOTAL PLUMBING TOTAL MECHANICAL
OWNER/BUILDER Acknowledges submission of inaccurate information may result in a stop work order or permit revocation.Acknowledgement of
such is by signature below.I declare that I am the owner,owners legal representative,or the contractor.I further declare that I am entitled to receive this
permit and to do the work as proposed in the application.I declare that I have obtained the permission from all the necessary parties.If permission is
required from any easement holder or any other parry in interest regarding this application or the work proposed in the application,I have obtained
permission from them to apply for this permit and conduct the work proposed. The owner or agent on owners behalf,represents that the information
provided is accu �rantsemployees of Mason County access to the above described property and structure for review and inspection.
PR
Y MEANS OF A PROGRESS INSPECTION.
X Date:—�T�
!:�O;wn�er/Own (indicate which one)
do FOR OFFICIAL USE BEYQND TH OINT
Accepted by Planning Pd Ck# Date 28-�' Bid Pd Receipt No.
DEPART"E TAL REVIEW APPROVED DENIED NOTES
Building Depladment
Occ Group—Type Constr.-
Planning Constr.—
Planning Department
Environmental Health Department
FEES
Plumbing & Base Fee Site Inspection
Mechanical & Base fee UFC Plan Review Fee
Wood/Gas/Pellet Stove Fee Other
Violation Fee TOTAL FEES
MASON COUNTY PERMIT NO. (UJ
PLUMBING/MECHANICAL PERMIT APPLICATION
426 W.Cedar-P.O. Box 186, Shelton,WA 98584
Shelton (360) 427-9670-Belfair(360)275-4467- Elma(360) 482-5269
On the web www.co.mason.wa.us
APPLICAPT INFORMATION CONTRACTOR RMATION ---�--
Owner P w l 1p O h S Q&/ Company Nam VVtt
Mailing Address Mailing Address --
City State Zip Code City State Zip Code
Phone Other Ph. Phone Other Ph.
Lien/Title Holder Contractor Reg.4 Exp.
E mail address E Mail Address
Drivers Lic.# DOB Drivers Lic.# DOB
SEPTIC INFORMATION - Connect to New Septic Existing Septic Connect to Sewer System
Name of Sewer System
I PARCEL INFORMATION - 12 Digit Parcel No. Z b — -- 0 U 4 L Fire District
Legal Description
Site Address (Please include street name, street number and city) D E- 1q,4 Q.Q��- '^
Directions to site
Is property within 200'of Saltwater Lake 84UP-0 -River/Creek Pond
Wetland Seasonal Runoff—Stream—Slopes or Bluffs > 15%
TYPE OF JOB - New Add Alt Repair Other Use of Building
Location of Fixtures/Units- 1st Floor_ 2nd Floor_ Basement Garage—Closet
PLUMBING FIXTURES (Show Number of each) MECHANICAL UNJ,TS
Type of Fixture No. of Fixtures Fees Fuel Type:Electri LPCz_ Natural Gas Heat Pump_
Toilets Type of Unit No. of Units Fees
Bathroom Sink Furnace
Bath Tubs 1 Heatpumps
Showers �— Spot Vent Fan
—
Water Heater Propane Tank
Clothes Washer Gas Outlets Iz-
Kithen Sinks f Woodja�PelletStove /
Dishwasher �— Kitchen--xhaust Hood 1
Hosebibs _�___'"S Dryer Vent
Other 1 A N J r Other
Base Fee Base Fee
TOTAL PLUMBING TOTAL MECHANICAL
OWNER/BUILDER Acknowledges submission of inaccurate information may result in a stop work order or permit revocation.Acknowledgement of
such is by signature below.I declare that I am the owner,owners legal representative,or the contractor.I further declare that I am entitled to receive this
permit and to do the work as proposed in the application.I declare that I have obtained the permission from all the necessary parties.If permission is
required from any easement holder or any other party in interest regarding this application or the work proposed in the application,I have obtained
permission from them to apply for this permit and conduct the work proposed. The owner or agent on owners behalf,represents that the information
A
provided is accu rants employees of Mason County access to the above described property and structure for review and inspection.
p NU N F WORK IS BY MEANS OF A PROGRESS INSPECTION.
X Date: IZ 7✓�a -
Owner/Own rs Representative/Contractor (indicate which one)
FOR OFFICIAL USE BEYgND THJ� OINT
Accepted by kPlanning Pd k# Date Bld Pd Receipt No.
DEPART"E TAL REVIEW APP DENIED NOTES
Building Depadment
Occ Group-Type Constr.-
Planning Constr.-
Planning Department
Environmental Health Department
FEES
Plumbin &_Base Fee Site Ins ection
Mechanical& Base fee UFC Plan Review Fee
Wood/Gas/Pellet Stove Fee Other
Violation Fee TOTAL FEES
Mason County Planning Intake Checklist
Owners Name: Ow Rlo Date: 25-0
Project: Reviewed By:
Commercial Development: Y NO Comments:
PLANNER: GBM TSC PBC RD C MS
Site Plan: �0 + r)
North Arro
Property imensions: .50 XO PA , w C�
,X Streets nd Driveways Shown. Road name: ID Ut (,e — X 15�y1
ing S u own wi backs
e cation, Septic and D gin-fiel wn with setbacks
su ce at s, pon s, shoreline, wetlands, natural or historic drainage, defined
drainage ditches) �!
opography (slopes) 54o04 -
4al-D
Proposed Structure Setbacks (Di n/Set ck): I
F: IVA / E R: Si: yam/ n S2: 5 S
Utility and Drainage Easements: Yes o (if yes enter condition #5022)
Other Easements
Accessory Appurtenances: Propane / Heatpump ha
Does site plan show landings all exits? j��e:s)
Variance applied for: Yes / No - parking spaces allotted NQ
Li County Access Permit Need add condition #0010)
❑ State Access Permit Needed (add condition #0020) ��►5'j"I
Standard Conditions to be added to all Building per its that planning rejws: #5019 and #0700
Site Access: Are there any impediments (dogs/gates)that my rest ' access to your site?
n
Is the site clearly marked? How? Address n Ui&LA_),,0
❑ Name
Critical Areas: ❑ Other:
Shoreline Designation: Comprehensive Plan: Rural Z nin UGA Zoning:
❑ Not Applicable ❑ Agricultural �RR 2.5 5 10 20 ❑ VR ❑ CM
X Urban ❑ In-holding ❑ RMF ❑ R-1P ❑ LTA
❑ Rural ❑ L CFL ❑ RC 1 2 3 ❑ R-1R ❑ FR
❑ Conservancy ural ❑ RI ❑ R-2 ❑ MU
❑ Natural ❑ RAC ❑ RNR ❑ R-3 ❑ GC
❑ unkown ❑ RCC-Hamlet ❑ RT ❑ R-5 ❑ BI
❑ Allyn Urban Growth Area 0 MPR ❑ R-10 ❑ VC
❑ Belfair Urban Growth Area ❑ Unknown ❑ HC ❑ T
1 ❑ Shelton Urban Growth Area
l
Water Body(type of water if unn
l` SEPA: Yes/ No Unknown Flood Plain: YES/NO Unknown Map#
i
Aquifer Recharge: YES/ Unknown ap#
Tags/Cases:
RLC/SPI Case: Sp I 0U 1-001 3 6-Year Dev. Moratorium: Y
Eagle Nest Tag: YES/ O Other Y /N
Revised: 02-05-2008 I:\PLANNING\PAC\PLANNING INTAKE
j
q
MASON COUNTY
DEPARTMENT OF HEALTH SERVICES
May 14, 2008 PO BOX 1666 Shelton WA98584
Shelton (360)427-9670
Fax (360)427-8442
KEN HOBSON Elma (360)482-5269
15923 SE 177 ST
RENTON WA 98058 Belfair (360)275-4467
Case No.: BLD2008-00468 Parcel No.:223305000023
Dear Applicant:
Your building permit cannot be approved by Mason County Environmental Health until
the following are completed and turned in:
Please see comments at the end of this letter.
Please call me at(360)427-9670, ext. 279 if you have any questions.
Sincerely,
Amanda Reynolds
Environmental Health
Mason County Health Services
Comments: The as-built was provided by the original installer, but an O and M
report is still required.
5/14/2008
1 of 1 BLD2008-00468
i
l
THIS PARCEL
INCLUDES
PLANS, BLUEPRINTS
OfR OVERSIZE
IMAGES
LARGE FORMAT
IMAGES HAVE BEEN STORED IN
FILE CABINETS) UNDER
PARCEL NUMBER
PARCEL # as �� -
CASE # R td a009 -0(149
I
MASON COUNTY
DEPARTMENT OF HEALTH SERVICES
1
April 30, 2008 PO BOX 1666 Shelton WA 98584
Shelton (360)427-9670
Fax (360)427-8442
KEN HOBSON Elma (360)482-5269
15923 SE 177 ST
RENTON WA 98058 Belfair (360)275-4467
Case No.: BLD2008-00468 Parcel No.:223305000023
Dear Applicant:
Your building permit cannot be approved by Mason County Environmental Health until
the following are completed and turned in:
06 Approved septic records or approved septic design for 3 bedrooms
Report within the last three years from either a septic tank pumper or an Operation
and Maintenance Specialist.
Please see comments at the end of this letter.
Please call me at(360)427-9670, ext. 554 if you have any questions.
Sincerely,
Trish Woolett
tw@co.mason.wa.us
Environmental Health
Mason County Health Services
Comments: No record of final inspection on septic system, Need as built drawn by
licensed designer or engineer.
Need pumper/ maintenance report on system
4/30/2008 1 of 1 BLD2008-00468
{
1
MASON COUNTY
DEPARTMENT OF HEALTH SERVICES
Environmental Health - Personal Health
PO BOX 1666 SHELTON,WA 98584
LOCAL(360)427-9670
BELFAIR(360)275-4467
FAX(360)427-7798
Application for Determination of Adequacy
Instructions
1. Complete Part 1. No determination can be made until Part 1 is fully completed.
2. Complete only the portion of Part 2 applying to the type of water system utilized.
3. Submit completed application,with attachments to the health department for review.
PART 1: ApplicantlParcel Identification
Name of Applicant_L/ m J4 b b S O to Date I �Z.z- O
Mailing Address - !18 —P9[ANXelephone--,U-0 222 6—67.35/
Assessor's Parcel Number
Type of Water System Check One): Reason for Application Check One):
❑ Public/Community Water System(2 or more Building permit
connections)'* ❑ Land use application, if so..
Individual water source(one connection), ❑ Division of land:
if so..
Well #of Parcels? SPH -
surface water
❑ Other(explain) ❑ Boundary line adjustment
"If you have more than one residence ❑ Other(explain)
connected to this well,check the Public box.
PART 2: Water System Information
i
Complete the section appropriate for the type of water system being evaluated:
Public Water S stem
Name ot water System
¢ Water Facility Inventory (WFI) Number:
(write"none"for two parry)
i
The water purveyor has filed a letter granting blanket hookups to this water system.
I am the manager of this water system. The water system has been approved for services.
There are presently connections in use. This will be the conneec on.This water
system is able and wt ing o provide water to this(these)connections o exceeding the limits of
the water system or any-limits set by state and local regulation.
Signature of Water System Manager Date
Update:December 2005
Individual Water Well
Water well report(attach to application) Depth �) ft.
Well capacity test(attach to application) ?D gpm gpd
e well dfillerotten performs well capacity es a time the well is cons c e .Results
from these tests are noted on the water well report. Results from these tests will be
accepted. If the water well report cannot be located by the applicant or if the water well report
does not have a capacity test, a well capacity test, which provides stabilization of draw-down
and recoverydata must be en`ormed bv a licensed contractor.
Satisfactory bacteriological test(attach to application)
Individual SpilnglSurface Water
WDOE permit (attach to application)
Method of disinfection
❑ 1 have reason to believe that this water source can provide at least 800 gallons per day and/or
provides water at a rate of 2 gallons per minute based on the following observaons.
AUTHOR OF STATEMENT DATE
RELATIONSHIP TO APPLICANT
IN ADDITION TO PROVIDING THE ABOVE STATEMENT, THE APPLICANT WILL NEED TO ARRANGE AN ON-SITE
INSPECTION BY THE HEALTH DEPARTMENT PRIOR TO DETERMINATION OF ADEQUACY.
Departmental use only. Do not write below this line.
PART 3: Health Department Evaluation (Staff Use Only)
SATISFACTORY DETERMINATION: Applicant's water supply appears adequate to
meet the needs of its intended use.
This determination does no address adequacy of the distribution system,guarantee
an adequate supply of water indefinitely into the future, or guarantee compliance
with all applicable WDOE water resource regulations.
UNSATISFACTORY DETERMINATION: Applicant's water supply does not appear
adequate to meet the needs of its intended use for the following reason (s):
REVIEWER'S SIGNATURE DATE
Update:December 2005
i
ALKAI CONSULTANTS, LLC.
Environmental Engineering • Geotechnical Engineering • Wetland Consulting
May 12,2008 Job# 10151
Mason County Department of Community Development f F
77-7
P.O.Box 279
Shelton,WA 98584 }
Attn: Mr. Scholz
Geological Assessment Report Review .:..
Permit#BLD 2008-00468
Applicant: Hobson
At your request, ALKAI CONSULTANTS have reviewed a Geological Assessment for the above referenced
permit by Envirotech Engineering dated May 1, 2008. The report was signed and stamped by Michael Clyde
Staten,PE(License#43045).
It is ALKAI's opinion that the geological assessment report contains the information required in the Mason
County Code 8.52.140 Section 5 (D), for a Geological Assessment. ALKAI therefore recommends that Mason
County accept the Geological Assessment for the referenced permit.
Should you have any questions or concerns, or if we may be of additional assistance, please call our office at
(360)613-2407 or contact us by e-mail at Jim@alkai.net.
Sincerely, p a
® 7'
41 �®
Donald Balmer,L.G. < Hydro:, )!,)gist jesrd' EIT
Senior Hydrogeologist �c1950 "�� ngineer
ed GO
eon
Donald K Balmer
9___los'
I
i
Attachments: Geo Tech Work Order
Geotechnical Assessment Report: Envirotech Engineering
Mason County Requirements Checklist
i'.
i
r
9465 Provost Road NW, Suite 202 •Silverdale,Washington 98383 • (360) 613-2407 • Fax: (360) 613-2408
i
ZOO
yM r b 3
Geological Assessment
for
Hobson Single Family Residential Property
20 NE Haven Place
Parcel No. 22330 50 00023
Mason County, Washington
May 1, 2008
Project#OU7
RECEIVED
2 �
Prepared For:
Ken Hobson
15923 SE 177" Street ��,CLYDFS�
Renton, Washington 98058w°F wnsy,�o'lk
Prepared By:
Envirotech Engineering "d�o� 43045 4
74 NE Hurd Road �SSfONALG1
Belfair, Washington 98528
Phone: 360-275-9374 EXPIRES JAN 10,2009
Fax: 360-275-4789
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
ZZ1Upslope Geomorphology.......................................................................................................3
ZZ2Do►unslopeCondltions..........................................................................................................3
2.3 SURFACE DRAINAGE.....................................................................................................................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
3.11 Groundwater......................................................................................................................... 6
3.4 SOILS TESTING.............................................................................................................................6
3.4.1 Visual Class leadon............................................................................................................. 6
4.0 ENGINEERING CONCLUSIONS..................................................................................................7
4.1 LANDSLIDE HAZARDs...................................................................................................................7
4.L1 Septic Drainfield Impacts......................................................................................................8
4.L2 Surface and Subsurface Drainage........................................................................................9
4.L3 Off-site impacts.....................................................................................................................9
4.2 EROSION HAzARDS.......................................................................................................................9
4.3 SEISMIC HAzARDs........................................................................................................................9
4.4 OTHER CONSIDERATIONS........................................................................................................... 10
5.0 CLOSURE..................................................................................................................................... 11
Appendix A- Site Plan
Appendix B - Soil Information
Soil Logs
Well Reports
1.0 INTRODUCTION
Envirotech Engineering (Envirotech) has completed this geological assessment for a
partially developed residential property located at 20 NE Haven Place, identified as
parcel number 22330 50 00023 located in Mason County, Washington (Project). 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
without the property owner, Keneth Hobson, on October 18, 2007. It was determined that
slopes between 15% and 40% were present within 300 feet of the planned development,
and subsequently will require a geological assessment pursuant to landslide hazard areas
of the Mason County Resource Ordinance (MCRO). During the evaluation, site visit, and
a following site visit on April 29, 2008, surface and subsurface conditions were assessed.
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 property owner's representative
with general assumptions by Envirotech that are typical of this type of development. The
Project is accessed by NE Haven Place connecting NE Haven Way. See the vicinity map
on the following page of this report. The existing development consists of a shed, septic
system, gravel driveway and site clearing associated with a former abode. The new
development is expected to consist of a new residential structure that will basically be
located near the footprint of the former dwelling. Building construction is expected to
consist of continuous footings established at least 12 inches below the existing ground
surface with a slab-on-grade or stem walls. Foundation drains are not anticipated for this
Project, and splash blocks are anticipated at the roof downspout outlets. Approximate site
development with relation to existing site features are illustrated in the Site Map in
Appendix A.
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:
Envirotech Engineering Geological Assessment
Ph. 360-275-9374 page 1 Parcel 22330 50 00023
Fax: 360-275-4789 Mason County,Washington
May 1,2008
• Review project information provided by the Project owner/ developer;
• Conduct a site visit to document the site conditions that may influence the
construction and performance of the proposed improvements;
• Define the general subsurface conditions of the site by observing excavations
within the Project, research geological maps, and review well logs from existing
wells near the Project;
• Perform soils testing to determine selected index properties of the soils that
includes 2 visual classifications;
• 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.
4N ,
} C R
rc
\ r
m/ Y
L
.y
T 'S -NE HAV-M WAY
O '
W
Y
S Project
517R - --
Vicinity Map from Mason County Website
Envirotech Engineering Geological Assessment
Ph. 360-275-9374 page 2 Parcel 22330 50 00023
Fax:360-275-4789 Mason County,Washington
May 1, 2008
2.0 SURFACE CONDITIONS
Information pertaining to the existing surface conditions for the Project was gathered on
October 18, 2007 and April 29, 2008 by Michael Staten, geotechnical engineer with
Envirotech. During the site visit, site features were documented, and near-surface soils
were visually classified. This Surface Conditions Section provides information on general
observations, vegetation, topography, drainage and slope/ erosion conditions for the
Project and surrounding areas that may impact the Project.
2.1 General Observations
The Project is currently partially developed land as previously mentioned, and
surrounded by moderate density rural residential development. Haven Lake borders the
west end of the property, and NE Haven Place borders the east side of the property. Low
density vegetation on the property consists primarily of firs, madronas, 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 Project is situated within and near moderate terrain. The planned building location is
nearly flat to slightly sloping due to existing and prior development. The topographic
information provided in this section was extrapolated from a public lidar source, and
incorporated observations and field measurements. Slope verification included measuring
slope lengths and inclinations with a cloth tape and clinometer. See the Site Map in
Appendix A for an illustration of the general slope indicators with respect to the planned
development.
2.2.1 Upslope Geomorphology
Ascending grades are located to the east of the planned development. These
slopes generally range from 5%to 8%, with a vertical relief of approximately 75
feet. There are no apparent natural water bodies or wetlands located upslope from
the planned development.
2.2.2 Downslope Conditions
Descending grades of up to approximately 28% exist to the west of the planned
building location, with a vertical relief of about 23 feet. This slope extends to the
shore of Haven Lake where the grade decreases to less than 5% as it descends into
the lake.
2.3 Surface Drainage
The majority of the stormwater runoff originating upslope from the anticipated
Envirotech Engineering Geological Assessment
Ph.360-275-9374 page 3 Parcel 22330 50 00023
Fax:360-275-4789 Mason County,Washington
May 1,2008
i.
development is expected to be minimal due to the natural drainage patterns directing
runoff to the north and east of the Project. Runoff originating on the Project appears to
mostly sheet flow towards the lake. Excessive scour, erosion or other indications of past
drainage problems were not observed at or near the planned development.
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.
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.
q L.
- --rr
- 24'
Aerial Photo from Mason County Website
Envirotech Engineering Geological Assessment
Ph. 360-275-9374 page 4 Parcel 22330 50 00023
Fax:360-275-4789 Mason County,Washington
May 1, 2008
3.0 SUBSURFACE INVESTIGATION
Information on subsurface conditions pertaining to the Project was gathered during
research and a site visit accomplished on October 18, 2007 by Michael Staten,
geotechnical engineer 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 one test pit log representative of the site soils, and one water well
report.
3.1 Field Methods,Sampling and Field Testing
Information on subsurface conditions for the Project was accomplished by observing
soils within a test pit excavation of up to approximately 4 feet below the existing ground
surface. Information on subsurface conditions also included reviewing 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. Field testing results generally indicated medium dense to dense soils in the
upper 12 inches, and very dense soils below 12 inches from the ground surface to the
depth of terminous.
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.
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 engineering properties of the soil, susceptibility for
potential landslides, erosion and seismic hazards may be assessed.
Envirotech Engineering Geological Assessment
Ph. 360-275-9374 page 5 Parcel 22330 50 00023
Fax:360-2754789 Mason County,Washington
May 1,2008
The Project is composed of native soils without any significant organic top soil, and no
indications of borrowed fill. For engineering purposes, these native soils consist of
distinguishable layers, as presented below.
Soils within the upper 12 inches of natural ground are primarily moist, dense, brown silty
sand with gravel (SM) and some cobbles. Gravels are primarily coarse, and subrounded.
Sand content was primarily medium to coarse, and the fines content exhibited low
plasticity.
Soils beginning at approximately 12 inches below the ground surface were exhibited to
be very dense, very low moisture, brownish grey poorly graded gravel with silt and sand
(GP-GM). Gravel content is primarily subrounded and coarse. Sand content was
primarily medium and coarse, and the fines exhibited none to low plasticity.
According to the well reports and knowledge of the general area, the hardpan extends to
depths of over 50 feet below the ground surface.
3.3.1 Groundwater
From the water well report, permanent groundwater is expected to be greater than
100 feet directly below the property near the planned building pad location.
Seepage or other perched groundwater was not observed during the site
investigation. Perched groundwater was indicated on the well report from a depth
of 75 feet to 90 feet below the ground surface.
3.4 Soils Testing
The soil samples obtained at the Project site during the field investigation were preserved
and transported for possible laboratory testing. Visual classification of soils was
performed in the field. The following soil tests were performed in accordance with the
American Standards for Testing and Materials(ASTNI):
2 Visual Classifications(ASTM D2488)
3.4.1 Visual Classification
The general results from the visual classification are presented above in the
Subsurface Conditions Section at depths of up to 4 feet below the natural ground
surface. Specifically, soils within the upper 1 feet consisted of approximately 40%
gravel, 45% sand-sized soils, and 15% silts. Soils below the previously referenced
strata consisted mostly of about 60% gravel, 30% sands, and 101/6 silts. Minor
variations observed during the visual classification of particle size content (i.e.
gravel, sand, fines), or isolated pockets within the soil stratification were
insignificant in relation to the overall engineering properties of the soil.
Envirotech Engineering Geological Assessment
Pk 360-275-9374 page 6 Parcel 22330 50 00023
Fax:360-275-4789 Mason County,Washington
May 1,2008
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4.0 ENGINEERING CONCLUSIONS
The following sections present engineering assessments and conclusions concerning the
proposed development of the Project. These conclusions have been made available based
on the planned improvements 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, surface and
subsurface conditions as presented in this report, it is Envirotech's opinion that the
proposed development is not within 300 feet of a landslide hazard area or its associated
buffer or setback.
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. With expected drainage and erosion control provisions for this
Project during and after construction, it is unlikely that this Project will experience
excessive surficial movements. However, 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 Resource Map from the Washington State Department of Natural
Resources (DNR), the Project is not within terrain labeled `highly unstable,' `highly
erodible,' `medium slope instability,' or `high slope instability.' In addition, DNR did not
indicated previous landslide activity near the Project. A resource map from DNR is
provided on the following page of this report.
Past landslide activity near the proposed development was not revealed during the Project
research. In addition, detrimental landslide activity was not observed during the site visit
Envirotech Engineering Geological Assessment
Ph. 360-275-9374 page 7 Parcel 22330 50 00023
Fax: 360-275-4789 Mason County,Washington
May 1,2008
as outlined in the Surface Conditions Section of this report. Considering the planned
construction as summarized in the Introduction Section of this report, it is our opinion
that the proposed site alterations will not encourage a landslide hazard.
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4.1.1 Septic Drainfield Impacts
The approximate location of the existing septic drainfield is presented on the Site
Plan in Appendix A of this report. The drainfield is not expected to adversely
influence moderate slopes within the vicinity of the septic components. This
determination is partly based on the behavior and characteristics of the Project
soils under saturated conditions, location of the drainfield, in addition to the
Envirotech Engineering Geological Assessment
Ph. 360-275-9374 page 8 Parcel 22330 50 00023
Fax: 360-275-4789 Mason County,Washington
May 1,2008
relatively moderate grades located away from the existing drainfield location.
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.
4.1.3 Off-site impacts
Potential off-site impacts are limited for this Project. From a geotechnical
perspective, it is Envirotech's opinion that adjacent properties, both upslope and
downslope from the planned site alterations should not be negatively impacted.
Existing stable slopes, good stormwater dispersal, and anticipated stable slopes
after construction does not warrant off-site concerns for this Project.
4.2 Erosion Hazards
Based on the USCS description of the Project soils,the upper soils are considered to have
a low to moderate erodibility factor. Since construction will occur on relatively flat
ground, eroding soils is not a major concern. However, 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. Erosion control measures may need to be employed if excessive erosion
occurs or required by the County or other prevailing agencies.
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 C, 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 a Class `A,` and is located approximately
Envirotech Engineering Geological Assessment
Ph. 360-275-9374 page 9 Parcel 22330 50 00023
Fax:360-275-4789 Mason County,Washington
May 1,2008
9 miles to the south 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 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. Significant `submerged and confined' sand stratifications are not
anticipated to be within the upper 50 feet of the subsoils.
4.4 Other Considerations
Conclusions in this report are based on the anticipated improvements for this Project. Site
development that significantly deviates from the anticipated improvements presented in
this report may require geotechnical design recommendations. Foundation excavation and
building pad grading should be immediately removed from the site or stabilized in order
to prevent sedimentation into the nearby lake.
Envirotech Engineering Geological Assessment
Ph. 360-275-9374 page 10 Parcel 22330 50 00023
Fax:360-275-4789 Mason County,Washington
May 1,2008
i
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 a qualified engineer observes and documents the
construction, or 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
conclusions.
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,
Envirote h Engineering
Michael Staten,P.E.
Geotechnical Engineer
Geological Assessment
Envirotech Engineering1'x
Ph. 360-275-9374 page 11 Parcel 22330 50 00023
Fax:360-275-4789 Mason County,Washington
May 1,2008
APPENDIX A
SITE PLAN
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WELL LOG
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360-275-9374
TPI TEST PIT
SITE PLAN
APPENDIX B
SOIL INFORMATION
TEST PIT LOG
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Project ALMI CONSULTANTS 5/12/2008
Mason County Requirements
For Geotechnical Assessment
Mason County Code 8.52.140 section 5 (D)
x❑ 1) A discussion of geologic conditions in the general vicinity of the proposed development,
with geologic unit designation consistent with terminology used in the Coastal Zone Atlas
(Washington Department of Natural Resources, 1980)or in applicable U.S. Geologic
Survey maps(See page 2 for examples of maps). Use of soil conservation service soil
layer terminology is considered inappropriate for this assessment.
x❑ 2) A discussion of the groundwater conditions at the site, including the estimated depth to
water and the quantity of surface seepage and the upslope geomorphology and location of
upland waterbodies and wetlands.
x0 3) The approximate depth to hard or dense competent soil, e.g., glacial till or outwash sand.
x❑ 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.).
x0 5) A discussion of the history of landslide activity in the vicinity, as available in the Coastal
Zone Atlas, the map of"Relative Slope Stability of the Southern Hood Canal Area,
Washington" by M. Smith and R.J. Carson, 1977 (More examples listed on page 2) and the
landslide records on file with the Mason County Department of Community Development.
x❑ 6) An opinion on whether the proposed development is within the landslide hazard area or its
associated buffer or setback.
x 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.
x❑ 8) If the presence of a hazard is determined within three hundred feet of the proposed
development, then the area of proposed development, the boundaries of the hazard, and
associated buffers and setbacks shall be delineated (top, both sides, and toe)on a
geologic map/site map.
0 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.
i
1