Final Interim Remedial Action Work Plan Boeing Auburn Area 1 700 15 130 2nd Avenue South
Edmonds, WA 98020
(425) 778-0907
























May 7, 2004





Prepared for

The Boeing Company
Seattle, WA
Final
Interim Remedial Action Work Plan
Boeing Auburn Area 1
700 15
th
Street SW
Auburn, Washington 5/7/04 \\Edmdata\wproc\025\169\IRA WP Final\IRA WP.doc
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TABLE OF CONTENTS
Page
1.0

INTRODUCTION 1-1

1.1

BACKGROUND 1-1

1.2

EXISTING CONDITIONS
1-2

1.2.1

Description of SWMU S-12b and AOC A-08
1-2

1.2.2

Distribution of VOCs in Groundwater
1-2

1.2.3

Current Bacterial and Aquifer Redox Conditions
1-3

1.2.4

VOCs in Soil
1-4

1.2.5

Hydrogeology 1-4

2.0

ELECTRON DONOR AMENDMENT
2-1

2.1

GENERAL OBJECTIVES
2-1

2.2

DESCRIPTION OF ELECTRON DONORS
2-2

2.2.1

Soluble Donors
2-2

2.2.2

Insoluble Donor
2-3

2.2.3

Combination of Soluble and Insoluble Donors
2-4

2.3

ELECTRON DONOR INJECTION
2-4

2.3.1

Injection wells
2-4

2.3.2

Initial Injection
2-5

2.3.3

Subsequent Injections
2-7

3.0

TRACER TESTING
3-1

4.0

GROUNDWATER MONITORING
4-1

4.1

MONITORING WELLS
4-1

4.2

MONITORING PARAMETERS
4-2

4.3

BASELINE MONITORING
4-2

4.4

MONITORING FOLLOWING ELECTRON DONOR AMENDMENT
4-2

5.0

GROUNDWATER DATA EVALUATION
5-1

6.0

METHANE EVALUATION AND MONITORING
6-1

7.0

SCHEDULE
7-1

8.0

REPORTING
8-1

9.0

USE OF THIS REPORT
9-1

10.0

REFERENCES 10-1




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LIST OF FIGURES
Figure Title
1
Vicinity Map
2
Area 1 Parcels
3
Building 17-05 SWMU S-12b and AOC A-08
4
SWMU S-12b and AOC A-08 TCE Concentrations in Groundwater
5
Cross Section Locations
6
Cross Section A-A
7
Cross Section B-B
8
Cross Section C-C
9
Cross Section D-D
10
Cross Section E-E
11
Cross Section F-F
12
SWMU S-12b and AOC A-08 Proposed Monitoring and Injection Wells
13
SWMU S-12b and AOC A-08 Typical Injection Well Design
14
Cross Section A-A Example Injection Setup



LIST OF TABLES
Table Title
1 Groundwater
Monitoring
Matrix



APPENDICES
A
Technical Memorandum: Potential Pore Water Impacts Evaluation
B
Health and Safety Plan
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1.0 INTRODUCTION
This document presents a work plan to conduct interim remedial action in the vicinity of Solid
Waste Management Unit (SWMU) S-12b and Area of Concern (AOC) A-08 at the Boeing Companys
(Boeing) Auburn fabrication division facility located at 700 15
th
Street SW, Auburn, Washington
(Figure 1). Proposed interim action consists of active remediation in the vicinity of SWMU S-12b and
AOC A-08, where the highest groundwater concentrations of volatile organic compounds (VOCs) at the
Auburn facility have been observed. Active remediation in this apparent release area will consist of
enhancing in situ reductive dechlorination through electron donor amendment. Preparation of this interim
action work plan was authorized under Work Order No. ENV-G-04AUB-036.
The objective of the proposed interim action is to reduce VOC concentrations in the release area.
This objective is based on the understanding that following a significant decrease in concentrations in the
release area, Ecology would not require a prospective purchaser to be designated a Potentially Liable
Person (PLP). Following significant reduction of concentrations in the release area, Boeing anticipates
application of monitored natural attenuation (MNA) as a remedy for the rest of the VOC plume.

1.1
BACKGROUND
Boeing is currently undergoing corrective action at the Auburn facility. Corrective action
requirements are documented in an Agreed Order (Order) (No. DE 01HWTRNR-3345) dated August 14,
2002 issued by the Washington State Department of Ecology (Ecology) to Boeing. The Order includes
requirements to conduct a remedial investigation (RI) at the facility. A final RI Work Plan incorporating
Ecology comments was completed in October 2003 (Geomatrix 2003).
Boeing plans to surplus and is considering the possible sale of three separate parcels at the
northern end of the facility referred to as Area 1 (Figure 2). Beginning in October 2003, Boeing has
worked with Ecology to meet the requirements of Section VII (13) of the Order, which documents
requirements for transfer of property. In November and December 2003, Boeing performed an initial
Area 1 investigation. The results of the initial investigation were presented in the Ecology Review Draft,
Area 1 Remedial Investigation Report (Landau Associates 2004a). Based on the results of the initial
investigation, a supplemental investigation of soil and groundwater was performed in the vicinity of
SWMU-S-12b and AOC A-08. The results of the supplemental investigation were presented in the
Ecology Review Draft, Supplemental Area 1 Remedial Investigation Report (Landau Associates 2004b).
The purpose of the initial and supplemental investigation (Area 1 investigations) was to provide a
thorough characterization of Area 1 on an expedited basis to meet accelerated schedule requirements for
the proposed property transfer. 5/7/04 \\Edmdata\wproc\025\169\IRA WP Final\IRA WP.doc
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1.2
EXISTING CONDITIONS
This section presents a summary of existing conditions primarily based on the results of the initial
and supplemental Area 1 investigations (Landau Associates 2004a, b).

1.2.1 D
ESCRIPTION OF
SWMU

S-12
B AND
AOC

A-08
SWMU S-12b is located within AOC A-08. AOC A-08 is the metalbond tank line consisting of a
former 120 ft by 250 ft by 15 ft deep concrete containment area that contained three process tank lines
with individual dip tanks. The tank lines were contained by a reported 3-ft-thick concrete floor
(Kennedy/Jenks 1997a). Hazardous substances used in the tank lines include acids and alkalines. The
southwestern corner of the tank line included SWMU S-12b, a former trichloroethene (TCE) degreaser
that later contained two trichloroethane (TCA) storage tanks. The TCE degreaser was removed in 1979.
The TCA tanks and metalbond tank line were removed in 1994. An area referred to as the solvent wash
area (Kennedy/Jenks 1995) or the body skin manual wash (Kennedy/Jenks 1997a) is located northwest of
the former TCE degreaser. A concrete patch observed around the perimeter of this area suggests that the
solvent wash area was an above-grade wash station surrounded by a perimeter containment moat. The
location of AOC A-08, SWMU S-12b, and former solvent wash area are shown on Figure 3.

1.2.2 D
ISTRIBUTION OF
VOC
S IN
G
ROUNDWATER

The highest VOC concentrations in groundwater occur in the direct vicinity of the former SWMU
S-12b vapor degreaser and extend downgradient and to the north-northwest. TCE is the most frequently
detected VOC, with concentrations ranging from 1.6 µg/L to 230 µg/L. TCE groundwater concentrations
greater than 50 µg/L were detected during the Area 1 investigations only at borings ASB-0121 (90 µg/L)
and ASB-0134 (230 µg/L), located adjacent to and downgradient of the former vapor degreaser. TCE
concentrations measured in groundwater samples collected beneath the AOC A-08 former metalbond
tankline from borings ASB-0126, ASB-0127, and ASB-0128 ranged from 1.6 to 38 µg/L. Vinyl chloride
is the only VOC other than TCE that was detected in the vicinity of SWMU S-12b and AOC A-08 at
concentrations greater than Model Toxics Control Act (MTCA) cleanup levels applied as screening
levels; detected vinyl chloride concentrations range from 0.2 µg/L to 11 µg/L. Concentrations of other
detected VOCs, including tetrachloroethene (PCE), cis-1,2-dichloroethene (cis-1,2-DCE), and
trichloroethane (TCA), do not exceed MTCA cleanup levels. Estimated isoconcentration contours for
TCE in shallow groundwater are shown on Figure 4.
The aerial and vertical extent of VOCs in groundwater are consistent with a relatively limited
VOC release from SWMU S-12b and less significant releases within the footprint of the AOC A-08 5/7/04 \\Edmdata\wproc\025\169\IRA WP Final\IRA WP.doc
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former tankline. Vertical water quality profile data from borings ASB-0133 and ASB-0134 show a
declining trend in VOC concentrations with depth. At b