15-105319A�k
CITY OF
Federal Way
GEOTECHNICAL ENGINEER AUTHORIZATION FORM
Date: October 29, 2015
City: City of Federal Way
Community Development Department
33325 8th Avenue South, Federal Way, WA 98003
Consultant: Carlo Evangelisti/Calvin McCaughan, P.E.
Geotechnical Services Director
Landau & Associates, Inc.
1115 West Bay Drive NW, Suite 201
Olympia, WA 98502
CEvangel isti@landauinc.com
Project: Sommerville Rebuild (Proposed SFR) — Geotechnical Engineering Report
Property: 29604 23`d Ave SW, Federal Way, 98023; Parcel #012103 9108
File No.: 15-101977-AD; Related PFNs. 15-105180-SF/15-105178 -SH
Project Consultant Keith S. Schembs, LEG/Dana Biggerstaff, PE
Contacts: GeoResources, LLC
5007 Pacific Hwy E., Suite 16
Fife, Washington 98424
Project Applicant/ Prime NW Construction
Project Contact: 113 Sleater Kinney Rd SE
Lacey, WA 98503
i ul ie. bra nn berg@Rma i I .com
City Project Planner: Leila Willoughby -Oakes
leila.willottghb -oakes citvoffederalwa .com, 253-835-2644
Project Background: On October 12, 2015, the applicant submitted a building permit and a shoreline
substantial development permit exemption to replace a single-family home partially
destroyed by fire. The existing 1920s home is approximately 1,600 square feet. The
applicant proposes a new two-story residence with a basement. The residence is 6,793
sq. ft., with a 1,200 sq. ft. deck and 672 sq. ft. garage. The total new square footage is
8,665 sq. ft.
The applicant proposes public water through Lakehaven. The existing home is
currently on septic. For drainage the proposal includes a 32.5-inch storm conveyance
to be above ground in the slope on an area exceeding 40%.
The subject property is identified as a Geologically Hazardous Area on City's critical
area inventory, and specifically designated:
• Erosions hazard area
• Landslide hazard areas
During a site visit in October 2015, planning staff noted a severe slope/drop-off on the
northern side of the existing home.
Please note a building permit, a shoreline exemption, and an administrative decision
[AD] file are active on this property. Administrative Decisions are files used to track
technical peer reviews in Federal Way.
Documents . Geotechnical Engineering Report, `Proposed Single -Family Residence 29604 23`d
Provided: Ave SW, prepared by GeoResources (Sept. 20, 2014, revised plan forthcoming)
■ Plan -set and Reduced Site Plan prepared by Precise Engineering Inc. (June 6, 2015)
• Planning & Public Works Technical Comment Letter (October 2015)
• Email from EJ Walsh, Development Services Manager to Leila Willoughby -Oakes,
Associate Planner, Geotechnical Report comments (October 15, 2015)
Task Scope: 1. Review submitted documents for conformance with, but not limited to:
a) FWRC 15.10.010-15.10.160
Article I- Generally,
Article II - Administration,
Article III - General Site Design Requirements, and;
Article IV- Geologically Hazardous Areas Development.
2. Conduct a site visit.
3. Provide a memo identifying additional information or revisions as necessary.
4. Meetings on site with the applicant's Geotechnical Engineer or City of Federal
Way staff if necessary.
5. Provide a written response as to whether or not Landau concurs with
GeoresoLlrces' findings, conclusions and recommendations.
Task Schedule: Provide task cost estimate by November 10, 2015.
Not to exceed $ 1.,o 7 without a prior written amendment to this Task
Authorization.
The total task amount completed by city staff after the third party consultant returns this form.
All spaces are to be completed including the total work estimate, on the grounds that the
estimate has been approved by the Project Planner.
Acceptan� r
Third -Party Consultant (
of Federal Way Staff
Applicant
Inc.)
Z I zol 5
Date
A(i
Date
Date
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15-1053190-AD Doc LD 71192
RECEIVED BY
COMMUNITY E�" r3MxC —
DEVELOPMENT pEW.i�RTMEN, LANDAU
NOV 4 2015 iA ASSOCIATES
TRANSMITTAL
To: City of Federal Way,
Community Development Department Date: November 3, 2015
Attn: Leila Willoughby -Oakes Project No.: 143.500
RE: Sommerville Rebuild (Proposed SFR)-Geotechnical Engineering Report
pies Description
1 Geotechnical Engineer Authorization
-LI
Ms. Willoughby -Oakes,
Enclosed is one signed agreement for the above -referenced project. Please contact Carlo Evangelisti
at (425)-778-0907 or via email at ceval7gelisti lanclac]iric.corn with any questions.
Thank you,
LANDAU ASSOCIATES, INC.
Beth Roberts
Project Coordinator
[C:\Users\broberts\Desktop\L_Willoughby0akes trns_11032015.docx]
1115 West Bay Drive NW, Suite 201 • Olympia, Washington 98502 • (360) 791-3178 0 www.landauinc.com
October 29, 2015
Jim Ferrell, Mayor
Calvin McCaughan, P.E. Emailed: CMcCau7han@landauinc.co.m
Landau Associates, Inc.
1 115 West Bay Drive NW,, Suite 201
Olympia, WA 98502
RE: File #15-105319-00-AD; REQUEST FOR THIRD PARTY REVIEW
Sommerville Residence (Fire Rebuild), 29604 23m Ave SW (720250-0090), Federal Way
Dear Mr. McCaughan:
Please find the enclosed task authorization form for 29604 23'6 Ave SW, Federal Way, and related project
file nos. 15-105180-00—SF (building permit) and 15-105178-SH (shoreline exemption). Planning
conducted a site visit October 16, 2015, and the Development Services Manager conducted a preliminary
technical review of the geotechnical study and site plan. The city sent a technical review letter in October.
The City requests a third -party review pursuant to the agreed terms of the on -call contract to proceed with
the building permit review. We will notify you when study and plan revisions are resubmitted to the
Permit Center. Please review the task authorization form enclosed, enter the task cost on page 2 of the
document, and return to the city by email and the signed original by mail. Following the deposit of fiends
by the applicant, planning staff will provide authorization to proceed with the scope of work.
For the purposes of expediting review timelines, the City requests the proposed tasks are completed
within 10 business days of receiving notice to proceed from the City.
Please contact the project planner at 253-835-2644 or lei la.willoug'libv-oakes e tiiyoffederalway.com if
you have any questions regarding this task or the proposed scope.
Sincerely,
Leila Willoughby -Oakes
Associate Planner
enc: Consultant Task Authorization Form
Geotechnical Report - 'Proposed SFR, 29604 23`d Ave. SW' (prepared by GeoResources, Sept. 20, 2014, revised study forthcoming)
City Technical Review Comments (October 2015)
Reduced Site Plan, Prepared by Precise Engineering. Inc. (received October 12, 201 5)
Stamped Project Plan Drawings, Prepared by Precise Engineering_ Inc. (.June 2, 201 5)
Doc I.D 71191
33325 8th Avenue South, Federal Way, WA 98003-6325 (253) 835-7000 • www.cityoffederaIway.com
S
J�
Leila Willoughby -Oakes
From: RECEIVEReila Willoughby -Oakes
Sent: Thursday, October 15, 2015 9:47 AM
To: OCT 1912015 permit Center
Cc: Isaac Conlen
Subject: CITY OF FEDERALVV File Request- SOMMERVILLE SFR REBUILD
CDS
Hello,
1�
I would an AD file as a child of for permit nos.:
15-105178-SH and 15-105180-SF
A -D -t� ) 5 -/ Z -3-V �
I will print this email and put it in the processing drawer. The AD is for a third party review of a geotechnical study.
Thanks again,
Leila
X2644
1
M
Leila Willoughby -Oakes
From: Leila Willoughby -Oakes
Sent: Thursday, October 15, 2015 8:21 AM
To: Edward Walsh
Cc: Kevin Peterson; Isaac Conlen
Subject: RE: Sommerville Rebuild 15-105178-SH
Hi EJ,
Thank you for your time on the pre -review of the Sommerville Rebuild. I concur with your technical comments and will
arrange a peer review. I suspected the original beach cottage was smaller than the proposed single family as the
valuation is $1, 000, 000 and is +6,000 square feet. I will incorporate your comments in the review letter before the
starting the peer review.
Leila
From: Edward Walsh
Sent: Wednesday, October 14, 2015 4:29 PM
To: Leila Willoughby -Oakes
Cc: Kevin Peterson
Subject: Sommerville Rebuild 15-105178
Leila -
I'll bring over the marked up copy of the report I grabbed out of the SF review stack. I flagged a number of pages with
discrepancies that should be resolved by the applicant.
From what I see, both in the inconsistencies between the plans and Geo report, and also in the writing of the report, I
am fairly sure that Geo Resources did not review the house plans, foundations, etc. I would recommend that something
be required from them that they are ok with the plans. The plans do not incorporate a number of concerns they
outlined, related to both the foundations, erosion and drainage.
Regarding the drainage, we need to determine if it is permissible to discharge via a tightline pipe to the Puget Sound as
they are proposing per our standards. Given that is outstanding, the storm design may have to change anyway. Geo
Resources recommended that they connect to the tightline in the street, not what is proposed on the plans. I don't see
enough elevations on the plan to know if that option is feasible. In the event that they are permitted to go to the Sound,
this would involve construction of a drainage outfall pipe, anchors and outfall structure within the GHA and shoreline
management area. I am fairly sure that this would be a new disturbance to that area. I don't know what on your end, if
anything, needs to happen to permit that, if you are in agreement that it is even permissible.
From what I see between the report and the images on the King County GIS info, the existing structure that burned
down was a 1 story structure on a combination of stilts and a foundation. Basically it appears it was originally
constructed as a small summer home along the water. From the pictures, it appears that it was a fairly light structure
and probably contained minimal HVAC, piping, etc. that all add weight to the structure. What they are proposing is
essentially a 3 story house within the same +/- footprint using modern construction techniques with all the equipment
required to meet building codes. AKA, a substantial increase in structural loading above the top of slope.
Geo Resources simplified logic is that the former house was there for a long time and that they are staying in the same
footprint therefore it should be ok. They did do several test pits to 6-7 feet to classify soils and said that further
supported their logic. They also said the completed a simplified slide analysis and it is acceptable. The report includes no
laboratory data, no slide analysis input or output to support their conclusion and the test pits are shallow relative to the
depth of the proposed basement and adjacent slope to the OHWM.
Given the increase in load alone adjacent to the top of slope I would recommend this be sent to one of the third party
Geo companies for their review. While Geo Resources may be completely correct in all their assumptions and
recommendations, based on the limited information they submitted and the large increase in loading that doesn't really
appear anywhere in their report, I think this one should probably get sent out.
Any questions, let me know
EJ Walsh, PE
Development Services Manager
Public Works Department
33325 8th Ave South
Federal Way, WA 98003
Office: (253) 835-2730
www.CitvofFederalWay.com