03-101797 CITY OF G
•_
�v CITY HALL
33530 1st Way South (253) 661-4000
PO Box 9718 Federal Way, WA 98063-9718
June 20,2003
•
Mr. Carl F.Jonasson
4346 SW 307th Street
Federal Way, WA 98023-2127
Re: File No.03-101797-00-AD; RESPONSE TO INQUIRY
Single-Family Home Remodeling,4346 SW 307th Street
Dear Mr.Jonasson:
This is in response to your May 6, 2003, inquiry regarding the proposed residential remodeling work at
your home located at 4346 SW 307`h Street.The proposed scope of work includes construction of an entry
enhancement in the front of your home,construction of a mezzanine/loft style bedroom addition, and
construction of a living room addition. The bedroom and living room additions will require the
construction of foundation strip footings in the rear of the home that is oriented towards the nearby
shoreline bluff.According to the City's generalized Environmentally Sensitive Areas map,your property
is located on or within 25 feet of a Geologically Hazardous Area(GHA).Based on the findings of the
geotechnical memo included in your letter,you have requested City concurrence that a GHA is not
located on or within 25 feet of the proposed improvements. I have also identified a possible challenge
regarding your proposal's compliance with Federal Way City Code(FWCC)side setback requirements
(see paragraph 6,below).
Based on the submitted geotechnical memo prepared by Milbor-Pita&Associates and the
geotechnical/soils report criteria specified in FWCC Section 22-1286,the City is unable to concur with
your opinion that the proposed improvements are located outside a GHA. However,because the proposed
improvements are located within the"footprint"of the existing home and related site improvements,
additional geotechnical analysis, as specified in FWCC Section 22-1286,will not be required to construct
the above noted improvements. Be advised,a soils report may be required by the Federal Way Building
Division to verify compliance with relevant building code requirements.The proposed improvements,as
described in your submittal, are exempt from State Environmental Policy Act(SEPA)environmental
review and a Washington State Shoreline Substantial Development Permit.' The proposed living room
and bedroom additions, as indicated in your submittal,also meet shoreline setback requirements?
During a recent conversation,your wife inquired about what would be required to construct a deck and
stairway oriented towards the shoreline bluff.This deck and stairway is outside the scope of work for the
above entry enhancements,and living room and bedroom additions. A conceptual depiction of this deck
and walkway has been included with your submittal.
Pursuant to Washington State Administrative Code Sections 197-11-800(3)and 173-27-040(g)
2 The existing home is not subject to a shoreline stringline setback due to the adjacent vacant lot on the Palisades Retreat property
(parcel 112103-9029).Therefore,the shoreline setback would be 50 feet from the Ordinary High Water Mark.
Mr. Carl F.Jonasson
Page 2
June 20,2003
Based on the submitted depiction, it appears the proposed deck and walkway would be located outside the
"footprint"of the existing home and related site improvements. Therefore,you would need to submit a
complete geotechnical reconnaissance report/memo,verifying if any of the proposed deck and/or stairway
improver nts will be located on or within 25 feet of a GHA. Please refer to FWCC Section 22-1,
"Definitions"(enclosed), for the definition of each type of GHA. If the reconnaissance report/memo
indicates the presence of a GHA on or within 25 feet of the proposed improvements, a complete
geotechnical/soils report,meeting the requirements specified in FWCC Section 22-1286,will need to be
submitted for City review.3 A letter addressed to the Community Development Services Director(Ms.
Kathy McClung), requesting permission to construct improvements on or within 25 feet of a GHA will
also need to accompany your geotechnical/soils report. The construction of a deck and stairway on or
within 25 feet of a GHA will be required to undergo SEPA environmental review!The proposed deck
and stairway would likely meet the above noted shoreline setback requirements and would be exempt
from a Shoreline Substantial Development Permit.
Be advised, a building permit will be required as part of your proposed remodeling project and any future
deck additions. You should review relevant zoning code requirements(such as front and side setbacks,
maximum building height, lot coverage, etc.)prior to submitting your building permit application. Based
on a recent site visit and a review of the submitted site plan, it appears that portions of the proposed living
room and/or bedroom additions,and the conceptual deck and stairway improvements,may not meet the
minimum 10-foot side setback requirement. Prior to receiving any building permit approvals for the
proposed living room and/or bedroom improvements,and the deck and/or stairway improvements, you
will need to submit a property survey,performed by a licensed Washington State land surveyor,verifying
compliance with FWCC setback requirements. The above noted proposed improvements would not be
permitted within required setback areas. An existing land survey,performed by a licensed land surveyor,
can be submitted in place of preparing a new survey.
For reference,your property is located in the Suburban Estates(SE)zoning district. The SE zone use
table, providing general zoning requirements(noted above),has been enclosed for your review. If you
have any questions,please contact me at 253-661-4082,or rox.burhans@cityoffederalway.com.
Sincerely,
Rox Burhans
Associate Planner
enc:FWCC Sections 22-1,22-1286,and 22-596
3 The applicant is responsible for any fees incurred by the City's Geotechnical Consultant in reviewing the submitted
geotechnical report.A scope of work and cost estimate would be provided to the applicant prior to any consultant review.
4 As of the date of this letter,the fee for a non-project related SEPA review is$805.50.
File#03-101797-00-AD Doc.I .23528
Milbor-Pita
SSOCIATES,INC.
28Jan03
Carl F. Jonasson
4346 SW 307t St.
Federal Way, WA 98023
RE: Geological/Geotechnical Evaluation of Conditions of Property at 4346 SW
307th St.,Federal Way,WA
Per your request, I visited the site and we explored the property's flat upper portion and
the bluff. We gained access to the beach and explored that area as well. This letter is a
summary of my findings and a discussion of how this relates to the proposed remodel of
the existing house.
Observations & Comments
• The house is located on a ridge (see attached Figure 1 for topography & geologic
map), which means surface water from a major portion of the property is directed
south and then eastward and NOT toward the existing bluff. This condition is
probably the reason that no groundwater was observed surfacing the bluff slope
on or near your property.
• The slope itself is quite stable. It is steep, but the very dense glacial till and
advanced deposits are covered, for the most part, with vegetation. The toe is
protected by existing plant material and drift wood/stumps. The steep stability of
this hillside is probably a result of the lack of groundwater exiting the hillside in
this area.
• The existing house is constructed on very dense glacial till material that is
underlain by dense advanced deposits. This material composes the majority of
the steep bluffs in the Puget Sound region.
• One small area beneath a maple tree was exposed and appears less stable. From
my experience and discussions with arborists, this condition is typically a
condition where the root mass does not have enough soil to anchor the tree system
5 0 1 relative to the size of the tree canopy. The soil disturbance is a result of wind
n L s\n 1 f r.1 Y blowing the canopy and the tree truck acting as a lever arm to the roots, which
causes movement and loosening of the supporting soil. Typically the way to
reduce this condition is to trim, no remove, a portion of the tree's canopy
branches so the 'sail-area' is smaller and more in line with the size of the
available root holding capacity.
• The distance from the shoulder or edge of the bluff top to the nearest footing line
of the existing house is 41 feet. It is my understanding that all of your proposed
-*remodeling will not move or locate a new footing closer then this distance.
Therefore, the stress or loading on the soil will not change from the location it
currently is.
• The additional loading from the footings is greatly dissipated by the very dense
consistency of the glacial soil located at the top of the ridge and under the house
site. Stress distribution diagrams indicate that within a downward distance equal
Geoteclnical and Tunnel Consultants
17270 Woodinville-Redmond Rd,Ste 703 www.milbor-nita.com Phone(425)486 6561
Woodinville,WA 98072 Page 1 Fax(425)488-2660
to the footing width, the load decreases to 0.4 of the original and at two times the
width, it is negligible. Therefore, this remodel addition will not create loading on
the face or near the bluff that is different from what is occurring from the existing
house.
• All new downspots from the roof should be piped to the rear of the home and
CCumm, released in a controlled manner to the south. Nothing should be routed toward the
bluff.
Recommendations
Based on my above observations and design knowledge, I make the following
conclusions and recommendations:
• The property is currently stable for the most part. Changes to the property should
be limited to minor items so the overall current condition is preserved.
• . The proposed remodel additions fit.into the category of minor.changes.and should
be permitted. My reasoning is that the footing lines will be no closer to the bluff
shoulder than the existing footing and because the footing pressures-from a home
- ..:typically results in a low pressure.that will not be transmitted to the hillside.
• The only observed unstable hillside condition should be improved by the
-trimming of the tree in question. We recommend that this be preformed by a firm
that has an arborist on its staff so that the proper amount of trimming based on
experience and training can take place.
Closure
Authorization to proceed with this task was granted verbally by Mr. Carl F. Jonasson, the
homeowner. This report has been prepared for the exclusive use of the Jonasson's and
their agents, for specific application to this project in accordance with generally accepted
geotechnical/civil engineering.
The conclusions and,recommendations presented in this report are based on published
data and the surface exploration accomplished for this study. No subsurface explorations
were completed within the site to aid in our recommendations at this time. The long-term
integrity of a geotechnical design of this type depends on changes to the surrounding area
in the future. If changes are planned,.we should be contacted so we may evaluate those
changes and how they might impact this structure.
If after reviewing this report, should you have any questions, please o not hesitate to
call.
11-7
Milbor-Pita & Associates, Inc. �� �`%`'
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Geotechnical Project Manager •
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Cleoteehni�l and Tunnel Consultants
17270 Woodinville-Redmond Rd,Ste 703 vvvvw.milboaLnita aom Phone(425)486.6561
Woodinville,WA 98072 Page 2 Fax(425)488-2660
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Mr. Greg Fewins
Community Development Services Department I M l
City of Federal Way r k
P.O. Box 9718
Federal Way, WA 98063-9718
Dear Mr. Fewins;
In speaking with Ms. Deb Barker of your department,the suggestion has been made to
provide you with an analysis of my lot configuration and geological condition prior to
remodel permit application. My address is 4346 SW 307 St, Federal Way,parcel
112103-9030 on page 26,lying adjacent to and just East of the Palisades. As you know,
most of my lot lies within what is considered to be a geologically hazardous area. This
document will show why my house does not sit on such an area.
The Federal Way City Code, Article I, Section 22-1 defines a geologically hazardous area
as being susceptible to erosion, land-sliding, seismic or other geological events not
suitable for siting residential development. Four areas of concern are identitied.
1. Erosion hazard areas. The enclosed"Geological/Geotechnical Evaluation of
Conditions"of my property, stamped and signed by professional engineer Frank
Pita of Milbor-Pita, indicates in the first three bullet points the lack of an erosion
hazard.
2. Landslide hazard area.
a. Any area with a combination of slopes greater than 15%,permeable
sediment overlying relatively impermeable sediment, and springs or
groundwater seepage. The slope shoulder is 41 feet from the house,
steepness of slope is in excess of 15%, mostly varying from 50%to 68%
with a small steeper area down slope below a maple tree, but it does not
exhibit any spring or groundwater seepage. In addition,the house was
constructed on"very dense glacial till material that is underlain by dense
advanced deposits,"again indicating its stability.
b. "Any area which has shown movement during the Holocene epoch, from
10,000 years ago to present,or which is underlain by mass wastage
debris of that epoch." The slope has undoubtedly moved in the last
10,000 years, as have nearly all waterfront soil slopes in Puget Sound.
However, little danger exists to my house or adjacent residences/retreats
from the stability of my slope since there are no seeps present on the
slope and the area exhibits no soft slide-prone material.
c. Stream presence. No streams on-site or nearby.
d. "Any area located in a ravine or on an active alluvial fan,presently or
potentially subject to inundation by debris flows or flooding." Not
applicable.
RECEIVED
MAY 0 6 2003
CITY OF FEDERAL WAY
BUILDING DEPT.
• y 4
e. "Those areas identified by the United States Department of Agriculture
Soil Conservation Service as having a severe limitation for building site
7development."Assumed to be not relevant.
f. "Those areas mapped as class U (unstable), UOS (unstable old slides),
and URS (unstable recent slides)by the Department of Ecology."
Assumed that my house location is not within or near an unstable area.
The northerly most protrusion of the house is 220 feet from the Mean
High Water Line,thus exempting it from near shoreline considerations.
g. "Slopes having gradients greater than 80% subject to rockfall during
seismic shaking." No rocks are present in the face of the slope. Nearly
all areas of the slope have gradients of less than 80%.
3. Seismic hazard area subject to severe risk of earthquake damage, due to an
underlainment by cohesionless soils of low density usually in association with a
shallow groundwater table. The soils under our house are primarily glacial till,
not of a cohesionless nature,with no evidence of a shallow groundwater table
since most of the land around our lot is lower in elevation.
4. Steep slope hazard areas with a slope of 40%or greater with a vertical relief of
10 or more feet. Our waterfront bank is in excess of 40%, but its distance from
our house (41 feet), and its existing thick underbrush growth along with
numerous deciduous and coniferous trees present on its slope, indicates its
stability. The Palisades retreat immediately to the West of our lot recently
underwent a remodeling and addition in accordance with City of Federal Way
regulations.
Please review this document and respond with your concurrence that our house does not
reside on a geologically hazardous area, so that we may proceed with the permit process.
A preapplication conference would not be the best use of your or our time, since time is
of the essence and all applicable data will be submitted in the permit application
regardless. Thank you for your consideration.
Sincerely,
Coweirs.-Kot,0440-1.,
Carl and Denise Jonasson
4346 SW 307th St.
Federal Way
Phone 253-874-0197
Fax 253-874-0202
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