ITEM NO:      6b_Supp.__ 
DATE OF MEETING: July 14, 2015 
Briefing 
Lora Lake Apartments Cleanup 
July 2015

Site History 
Lora Lake Apartments were acquired in 1998 as part of third runway
property acquisition. 
Past site uses causing contamination include: 
Burien Auto Wrecking from the mid 1950s to mid 1980s. 
Novak Barrel Washing in the 1940s 
Current cleanup effort began with 2008 pre-development sampling 
Discovery of high levels of dioxin/furans in soil 
Entered into an Agreed Order with the Department of Ecology July
2009 
Remedial Investigation conducted 2010-1012 

Major contaminants driving the cleanup are                             dioxin/furans

Current Site Cleanup Status 
Initial public comment process on Investigation Report,
Draft Consent Decree and Cleanup Action Plan  Nov.
2013-Jan. 2014 
Commission authorized the CEO to execute this initial
Consent Decree implementing the clean up in September
2013 
Remedial Investigation and Feasibility Study finalized
January 2015 
A revised Consent Decree and Cleanup Action Plan went to
a second public comment in May-June 2015 

Site moving from an investigation phase to a cleanup phase

Site Location

Site Area Map

as 
SOUTH                            LORA LAKE .
'
'
APARTMENTS :            1982 DREDGED
Burien NERA      AVE                  PARCEL '-                              MATERIAL
8'" f CONIMNMENT

SOUTH 150'" STREET
'2
g
5
I
!
g FORMER SEATTLE
l .         PORT OF
j       CITY LIGHT '
_ SEATTLE
'
'
!       PROPERTY
PROPERTY
!
5
PORT OF
!
SEATTLE
PROPERTY

Legend
STIA 3"" RUNWAY
---- City Boundary


I                               ...r.._.v_..-..--.                                                                                                  /_APPROACH
Tax Parcel                                                                                                                                  LIGHTING SYSTEM
..
Extent of 1982 Dredged
1"": Appvoximate
L--.) Material Contamment Area
.
"
----'-- Apptoximate Location OI Fences                                                LORA LAKE
l Runway Protecuon Zones'                                                         PARCEL
l                    1
Controlled Achvuty Area
'
Extended Object Free Area

150

Scale Ir Feel

Cleanup Actions 
Apartments  Removal of 19,000 cubic yards of dioxin contaminated soil and
disposal at a permitted landfill 
Removal and relocation of Burien stormwater line 
Capping of 3.8 acres of remaining soil. 
Port option for additional cleanup to prepare site for development.
Deed Restrictions (no residential use, maintenance of cap) 
Lake Parcel  Capping of contaminated sediments, and restoration of Lora
Lake back to a wetland 
Removal of 3500 cubic yard of soil (reason for Consent Decree Revision) 
Deed Restrictions 
Dredge Disposal Area Expansion of current graveled laydown area to cap
contaminated dredge spoils 
Can be used as a consolidation area for export of low level soil from Apartment and
Lake Parcel 

Cleanup retains flexibility for future development

Cleanup Actions

Milestones and future schedule 
Execute the revised Consent Decree  July 2015 
Design Apartment and Lake Cleanup  2015-2016 
Complete Cleanup  Spring/Summer/Fall of 2017 
Actual cleanup schedule dependent on City of Burien
stormwater improvements 
Current Burien stormwater line on the Apartments Parcel needs to
be relocated 


Cleanup to occur as soon as 2017, if Burien stormwater improvements are complete

Financial Implications 
Total Estimate of Cleanup Cost = $19.5 Million, an increase of $1.3
million 
The cleanup costs of the Lora Lake Apartments parcel and the Lora
Lake parcel will be accounted for differently: 
The Lora Lake parcel cleanup estimated cost = $6.3 million 
Recognized as a 2013 operating cost, paid for through the landing fees 
The Lora Lake Apartments parcel estimated cost = $13.2 million 
Recognized as non-operating expense in 2012-2013 
MTCA Grant Funds from Ecology (50% matching) 
$1.5MM for the RI/FS 
$5.0MM for current costs, design and cleanup 
Anticipate receiving up to an additional 5MM in the 2015-2017 biennium 
Recognized costs both operating & non-operating  Eligible for 50% matching grants