Chula Vista City Council
November 18, 2025

Chemical All Areas
VOCs (µg/kg)
1,1,1‐Trichloroethane 1,700
1,1,2‐Trichloroethane 40
1,1‐Dichloroethane 560
1,1‐Dichloroethene 71
1,2‐Dichlorobenzene 28,000
1,2‐Dichloroethane 2.8
1,4‐Dichlorobenzene 230
Benzene 19
Chlorobenzene 2,000
cis‐1,2‐Dichloroethene 4,900
Ethylbenzene 7,700
Methylene chloride 19
Tetrachloroethene 2,100
Toluene 440
trans‐1,2‐Dichloroethene 170
Trichloroethene 27,000
Trifluorotrichloroethane (Freon 113) 6,400
Vinyl chloride 13,000
Xylenes 6,000
SVOCs (mg/kg)
Benzo(a)pyrene 14
bis(2‐Ethylhexyl)phthalate 57
PCBs (Total Aroclors) e 130
PETROLEUM MIXTURES (mg/kg)
Gasoline (C6‐C8) 2,900
Diesel (C9‐C16) 5,400
Oil (C17‐C32) 7,300
INORGANICS (mg/kg)
Antimony 7.84
Arsenic 24.3
Barium 43,000
Cadmium 970
Chromium 660
Chromium VI (Hexavalent) 30
Copper 5,600
Lead 232
Mercury 2.1
Nickel 3,400
NOTES:
ug/kg = micrograms per kilogram
mg/kg = milligrams per kilogram
VOC = volatile organic compound
SVOC = semi‐volatile organic compound
PCB = polychlorinated biphenyls
Groundwater Protection Level (GPL)
2018_0420_HAI_TABLE10_GPL.xlsx APRIL 2018
.;K Roytheon
Technologies
Raythoon Technologio3
EH&S Depa.tmeni
I Farm Springs Road
Farminglon, CT 06032
october 5, 2021
Mr. David Gibson, Executive Officer
San Diego Regional Water Quality Control Board
2375 Northside Drive, Suite 100
San Diego, California 92L08-2700
Notice of Change of Owner
Rohr, lnc., Chula Vista, CA Facility
Cleanup and Abatement Order No. R9-2021-0042
Dear Mr. Gibson:

By this correspondence, Raytheon Technologies Corporation on behalf of Rohr, Inc. (Rohr) is providing the San Diego Regional Water Quality control Board (SDRWQCB) written notification that Rohr lnc. sold the portion of Parcel A occupied by Buildings 29, 99 and 100 to PSIP Wohl Bay Boulevard LLC, a Delaware limited liability company on September 25,2O?O.ln accordance with Section M(2) of Cleanup and Abatement Order No. R9-2021-0042 (cAO) Rohr is also providing notification that the portion of Parcel A at 360, 364 and 358 Bay Boulevard was also purchased by PSIP Bay Boulevard LLC. The sale closed on September 28, 2021. The properties sold are shown on Figure 2 of the CAO.

Please do not hesitate to contact me at 207 -865-7022 or Bob Scott of Haley & Aldrich at 619- 285-7L4t il you have any questions or require further information.

Regards,
Xffi.eJohn L. Baron, CHMM, IEED AP
Senior Manager
Raytheon TechnoloBies Corporation Environmental Remediation Group Cc: Tom Alo, SDRWQCB
Emil J. Wohl, Wohl Property Group
William S. Waller, Esq., Pillsbury Law
Bob Scott, Haley & Aldrich
Kristen Sherman, Raytheon
John Erickson, Rohr, lnc.

Tyler Adkins, Rohr, lnc.

Collins Aerospace
850 Lagoon Drive
Chula Vista, CA 91910-2098 USA
+1 619 691 6425 Fax: +1 619 691 2222
[email protected]
www.collinsaerospace.com
Roberto Valenzuela
Sr. Director, Operations
Rohr, Inc., a Collins Aerospace Company
Aerostructures
July 8, 2022
San Diego Regional Water Quality Control Board
2375 Northside Drive, Suite 100
San Diego, California 92108-2700
Attention: Mr. Tom Alo
Subject: Update to the Revised Human Health Risk Assessment Rohr, Inc. – North Campus, Parcel A
850 Lagoon Drive
Chula Vista, California
SDRWQCB Reference: T0000011095:talo
Dear Mr. Alo:

Please find enclosed for your review, a copy of the subject document dated July 8, 2022 that was prepared by Haley & Aldrich, Inc. for Rohr, Inc., a Collins Aerospace Company (Rohr) for Parcel A at the site. This document is being submitted in response to Directive C.3 of Cleanup and Abatement Order No. R9-2021-0042, issued to Rohr on July 12, 2021 by the San Diego Regional Water Quality Control Board.
“I certify under penalty of law this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.”
If you have any questions, please contact Tyler Adkins at (619) 691-2020.

Sincerely,
Roberto Valenzuela
Sr. Director, Operations
DocuSign Envelope ID: 76F19677-C789-45C5-8BE5-36686A955CB4 www.haleyaldrich.com

UPDATE TO THE REVISED BASELINE

HUMAN HEALTH RISK ASSESSMENT
ROHR, INC. - NORTH CAMPUS, PARCEL A

CHULA VISTA, CALIFORNIA
by
Haley & Aldrich, Inc.

San Diego, California
for
Rohr, Inc., a Collins Aerospace Company
Chula Vista, California
File No. 127827-019
July 2022
www.haleyaldrich.com
July 8, 2022
File No. 127827-046
San Diego Regional Water Quality Control Board
2375 Northside Drive, Suite 100
San Diego, California 92108
Attention: Mr. Tom Alo
Subject: Update to the Revised Baseline Human Health Risk Assessment Rohr, Inc. - North Campus, Parcel A
850 Lagoon Drive
Chula Vista, California
GeoTracker Global ID T0000011095
Dear Mr. Alo:

Haley & Aldrich, Inc., is pleased to provide the San Diego Regional Water Quality Control Board (SDRWQCB) this Update to the Revised Baseline Human Health Risk Assessment (HHRA) for Parcel A of the Rohr, Inc., a Collins Aerospace Company North Campus facility located in Chula Vista, California. This HHRA was prepared to meet the requirements of Directive C.3 in the Cleanup and Abatement Order (CAO) No. R9-2021-0042 dated July 12, 2021.

The Revised Baseline Human Health Risk Assessment dated May 4, 2021, was prepared in response to comments provided by the Office of Environmental Health Hazard Assessment (OEHHA) in a memorandum to the SDRWQCB dated March 8, 2021, and following further discussion and clarification during a conference call on March 18, 2021. OEHHA concurred with the findings of the Revised Baseline HHRA in a June 30, 2021, letter.

This HHRA has been updated to add the soil and soil vapor data collected as part of the data gap assessment conducted in March 2022. Please note that data for the parcel at 350 Bay Boulevard was removed, since Rohr did not sell it to the new owner of Parcel A. Please contact us if you have questions or require additional information.

Sincerely yours,
HALEY & ALDRICH, INC.

Robert K. Scott, PG, CHg, QISP Anita Broughton, CIH
Senior Associate Hydrogeologist Principal
Enclosures
G:\127827_North Campus\019_Parcel A HHRA and Soil RAP\Deliverables\HHRA\2022_07_Submittal\2022_0708_Parcel A_HHRA_F.docx Haley & Aldrich, Inc.
5333 Mission Center Road
Suite 300
San Diego, CA 92108
619.280.9210
www.haleyaldrich.com
Haley & Aldrich, Inc.
5333 Mission Center Road
Suite 300
San Diego, CA 92108
619.280.9210

SIGNATURE PAGE FOR

UPDATE TO THE REVISED BASELINE HUMAN HEALTH RISK ASSESSMENT ROHR, INC. – NORTH CAMPUS, PARCEL A
850 LAGOON DRIVE

CHULA VISTA, CALIFORNIA

PREPARED FOR
ROHR, INC., A COLLINS AEROSPACE COMPANY

CHULA VISTA, CALIFORNIA
PREPARED BY:

Mathew T. Raithel
Senior Technical Specialist
Haley & Aldrich, Inc.

REVIEWED AND APPROVED BY:

Robert K. Scott, PG, CHg, QISP
Senior Associate Hydrogeologist
Haley & Aldrich, Inc.

Anita Broughton, CIH
Principal
Haley & Aldrich, Inc.

Table of Contents
Page
i
List of Tables iii
List of Figures iv
List of Acronyms and Abbreviations v

1. Introduction 1

1.1 SITE LOCATION 1

1.2 SITE DESCRIPTION AND HISTORY 2

1.2.1 Building 99 and Building 100 Area (North of G Street) 2

1.2.2 Building 29 Area (South of G Street) 3

1.3 SITE FUTURE USE 3

1.4 HHRA ORGANIZATION 3

2. Site Geology and Hydrogeology 4

2.1 SITE GEOLOGY 4

2.1.1 Artificial Fill 4

2.1.2 Bay Point Formation 4

2.1.3 Clay Aquitard 4

2.2 SITE HYDROGEOLOGY 5

3. Previous Investigations 6

3.1 BLANCHARD GRINDER UST CLOSURE 8

3.2 2013 URS SUPPLEMENTAL REMEDIAL INVESTIGATION 8

3.3 2016 PHASE II ENVIRONMENTAL SITE ASSESSMENT 8

3.4 2018 SUB-SLAB AND FOCUSED SOIL VAPOR SURVEY 9

3.5 2018-2019 INDOOR AIR SCREENING 10

3.6 2020 DATA GAP ASSESSMENT 10

3.7 2020 GSI PHASE II SCREENING INVESTIGATION 11

4. Human Health Risk Assessment 13

4.1 HAZARD IDENTIFICATION 14

4.1.1 Organic Chemicals of Potential Concern 15

4.1.2 Inorganic Chemicals of Potential Concern 15

4.2 EXPOSURE ASSESSMENT 16

4.2.1 Conceptual Site Model 16

4.2.2 Exposure Point Concentrations 18

4.2.3 Estimation of Chemical Intakes 24

4.3 TOXICITY ASSESSMENT 26

4.3.1 Adverse Noncarcinogenic Health Effects 27

4.3.2 Carcinogenic Health Effects 27

4.3.3 Chemical-specific Toxicity Values 28
Table of Contents
(continued) Page
ii

4.4 RISK CHARACTERIZATION 28

4.4.1 Calculation of Adverse Noncarcinogenic Health Effects for exposure to soil – Other Than Lead 28

4.4.2 Calculation of Adverse Noncarcinogenic Health Effects for Lead 29

4.4.3 Calculation of Cumulative Incremental Lifetime Cancer Risk from Exposure to Soil 29

4.4.4 Calculation of Incremental Lifetime Cancer Risk and Hazard Index from Inhalation of Vapors in Indoor Air 30

4.4.5 Acceptable Risk Thresholds 31

4.4.6 Summary of Risk Characterization Results 32

4.4.7 Uncertainty Analysis 33

5. Development of Health-Based Remediation Goals 35
References 37
Tables
Figures
Appendix A – Soil and Sub-Slab Soil Vapor Data Tables
Appendix B – ProUCL 95% UCL Input and Output Sheets
Appendix C – Vapor Intrusion Evaluation Calculations
Appendix D – Risk Calculations – Exposure Area-specific HHRA Appendix E – Risk Calculations – Development of Health-based Remediation Goals iii
List of Tables
Table No.
1 2
3 4
5 6
7 8
9 10
11 12
Title
List of Chemicals of Potential Concern
Summary of Background Metals Concentrations – Soil
Receptor Exposure Assumptions
Summary of Exposure Point Concentrations in Soil, Building 99/100 Exposure Area
Summary of Exposure Point Concentrations in Soil, Building 29 Exposure Area Summary of Exposure Point Concentrations in Soil, Building 29 Exposure Area (Planned Loading Dock Excavation Area Only)
Summary of Exposure Point Concentrations in Sub-Slab Soil Vapor, Building 99/100 Exposure Area
Summary of Exposure Point Concentrations in Sub-Slab Soil Vapor, Building 29 Exposure Area
Toxicity Values for Chemicals Detected in Soil Samples
Exposure Area-Specific Human Health Risk Assessment Summary Health-Based Remediation Goals
Human Health Risk Assessment Summary Using Health-Based Remediation Goal Concentrations
iv
List of Figures
Figure No.
1 2
3 4
5 6
7 8
9 Title
Site Locus
Site Plan
Geologic Cross Section A-A’
Geologic Cross Section B-B’
Sample Location Map
Historical Environmental Site Features
Potential Exposure Pathways, North Campus – Parcel A
Soil Vapor Sample Locations with Concentrations Greater than Health-Based Remediation Goals
Soil Sample Locations with Concentrations Greater than Health-Based Remediation Goals
v
List of Acronyms and Abbreviations
µg/kg micrograms per kilogram
µg/L micrograms per liter
µg/m3
micrograms per cubic meter
95% UCL 95% upper confidence level
ADI average daily intake
Adrian Brown Adrian Brown Consultants
APN Assessor Parcel Number
bgs below ground surface
CAO Cleanup and Abatement Order No. 98-08
cis-1,2-DCE cis-1,2-dichloroethene
cm2
/s square centimeter per second
cm3
/g cubic centimeter per gram
COPCs chemicals of potential concern
CSM Conceptual Site Model
DEH San Diego Department of Environmental Health
DTSC California Department of Toxic Substances Control
DTSC-SL California Department of Toxic Substances Control Screening Level EC exposure concentration
EPA U.S. Environmental Protection Agency
EPC exposure point concentration
HBRG heath-based remediation goal
HHRA Update revised April 20, 2018, “Human Health Risk Assessment Update” g/cm3
grams per cubic centimeter
GPL groundwater protection level
GSI GSI Environmental, Inc.

Haley & Aldrich Haley & Aldrich, Inc.

HERO Note 4 “Human Health Risk Assessment (HHRA) Note 4, Human and Ecological Risk Office (HERO) Guidance for Screening Level Human Health Risk Assessments”
HHRA Human Health Risk Assessment
HI hazard index
HQs hazard quotients
vi
List of Acronyms and Abbreviations
(continued)
ILCRs incremental lifetime cancer risks
IURF inhalation unit risk factor
J&E Model Johnson & Ettinger Model
LADI lifetime average daily intake
LOAEL lowest-observed-adverse-effect-level
MCL State of California Maximum Contaminant Level
m3
/kg meter cubed per kilogram
mg/kg milligrams per kilogram
mg/kg-day milligrams of chemical per kilogram of body weight per day mg/L milligrams per liter
mg/m3
milligram per cubic meter
NFA No Further Action
ng/kg nanograms per kilogram
NOAEL no-observed-adverse-effect-level
OCPs organochlorine pesticides
OEHHA California Office of Health Hazard Assessment
Owner PSIP Wohl Bay Boulevard LLC
PAHs polycyclic aromatic hydrocarbons
Partner Partner Engineering and Science, Inc.

PCBs polychlorinated biphenyls
PCE tetrachloroethene
PEA Manual “Preliminary Endangerment Assessment Guidance Manual (A guidance for evaluating hazardous substance release sites)”
PEF particulate emission factor
Phase I Phase I Environmental Site Assessment
Phase II Phase II Environmental Site Assessment
RfCs reference concentrations
RfDs reference doses
RME reasonable maximum exposure
RMP Risk Management Plan
Rohr Rohr, Inc., a Collins Aerospace Company
vii
List of Acronyms and Abbreviations
(continued)
SDRWQCB San Diego Regional Water Quality Control Board
SFs slope factors
Site Parcel A on the North Campus property in Chula Vista, California SSDS sub-slab depressurization system
STLC Soluble Threshold Limit Concentration
SVOCs semi-volatile organic compounds
TCE trichloroethene
the City the City of Chula Vista
TPH total petroleum hydrocarbons
TRPH total recoverable petroleum hydrocarbon
TTLC Total Threshold Limit Concentration
URFs unit risk factors
URS URS Corporation
URSGWC URS Greiner Woodward-Clyde
UST underground storage tank
VF volatilization factor
VOCs volatile organic compounds
Work Plan Data Gap Investigation Work Plan
WCC Woodward-Clyde Consultants
1 1. Introduction
Haley & Aldrich, Inc., (Haley & Aldrich) prepared this Update to the Revised Baseline Human Health Risk Assessment report (HHRA) on behalf of Rohr, Inc., a Collins Aerospace Company, (Rohr) for Parcel A on the North Campus property in Chula Vista, California (Site). Parcel A comprises Buildings 29, 99, and 100 and Parcel A is bound by Bay Boulevard on the east, a railroad right-of way on the west, H Street on the South, and vacant properties owned by Rohr to the north (Figures 1 and 2). This HHRA was prepared in accordance with, and to meet the requirements of Directive C.3 in the Cleanup and Abatement Order (CAO) No. R9-2021-0042 dated July 12, 2021. The Revised Baseline Human Health Risk Assessment dated May 4, 2021, was prepared in response to comments provided by the Office of Environmental Health Hazard Assessment (OEHHA) in a memorandum to the San Diego Regional Water Quality Control Board (SDRWQCB) dated March 8, 2021, and following further discussion and clarification during a conference call on March 18, 2021. OEHHA concurred with the findings of the Revised Baseline Human Health Risk Assessment in a letter dated June 30, 2021. This HHRA has been updated with soil and soil vapor data collected as part of the data gap assessment conducted in March 2022. This HHRA does not include the vacant lot at 350 Bay Boulevard, since the new owner of Parcel A has not purchased this parcel from Rohr.

Rohr is in the process of selling portions of its facility that occupied approximately 82 acres. The Site has been divided into three parts: Parcels A, B, and C. In September 2020, Rohr sold Parcel A that includes Buildings 29, 99, and 100 (assessor parcel number [APN] 567-022-30 and the eastern portion of APN 571-330-29) to PSIP Wohl Bay Boulevard LLC (Owner). The Owner has also purchased the vacant parcels at 360, 364, and 368 Bay Boulevard (APNs 567-022-28, 567-022-31, and 567-022-33). These parcels, formerly included in Parcel C, are also included in this Update to the Revised HHRA. With these added parcels, Parcel A occupies approximately 14.7 acres.

The Owner intends to raze the northern portion of Building 29 to build a loading dock and may raze Buildings 99 and 100 to redevelop this parcel and the adjoining vacant properties to the north for surface parking. This Update to the Revised HHRA considers two scenarios, one with Buildings 99 and 100 remaining in place and the other assuming these buildings have been demolished. Buildings may be constructed in the future at undetermined locations on that portion of Parcel A.

1.1 SITE LOCATION
The Site consists of two APNs that are part of Rohr’s manufacturing facility, including APN 567-022-30- 00 and the eastern portion of APN 571-330-29-00, as well as three APNs that were not part of Rohr manufacturing facility that include APNs 567-022-28-00, 567-022-31-00, and 567-022-33-00. The following table summarizes the APNs, historical street addresses, and names that have been used for these properties.

APN Address Property Name/Building
567-022-28 360 Bay Boulevard B & H Metal Co. (1956-1964) A & R Used Auto Parts (1964-1985)
567-022-31 364 Bay Boulevard So. Bay Veterinary Hospital (1956-1964) Post Aircraft Co./For Mac Co., aircraft parts rear (1960-1964) 2 Note: * Portion of the APN east of the railroad right-of-way

1.2 SITE DESCRIPTION AND HISTORY
APN 567-022-30-00 and the eastern portion of APN 571-330-29-00 are part of Rohr’s manufacturing facility that is primarily located west of the Site and has occupied the Chula Vista Bayfront since 1941 (Adrian Brown Consultants [Adrian Brown], 1998; URS Corporation [URS], 2013). The parcels at 360, 364, and 368 Bay Boulevard (APNs 567-022-28, 567-022-31 and 567-022-33) were not part of Rohr’s manufacturing facility. Rohr primarily manufactured structural and engine components for aircraft (nacelles). The facility’s Standard Industrial Classification Code is 3728. The Site is divided by G Street; the areas north and south of G Street are therefore described separately.

1.2.1 Building 99 and Building 100 Area (North of G Street) For the purpose of this Revised HHRA, the Building 99 and 100 Area includes the following properties north of G Street: Buildings 99 and 100 (APN 567-022-30) and three vacant properties to the north at 360, 364, and 368 Bay Boulevard (APNs 567-022-28, 567-022-31, and 567-022-33). Rohr will retain the properties at 798 F Street and 340 and 350 Bay Boulevard. These four Rohr parcels (APNs 567-022-01, 567-022-17, 567-022-36, and 567-022-35) remain part of Parcel C.

The property between Lagoon Drive (formerly F Street) and G Street, which includes the Building 99 and 100 Area, was developed agriculturally as a citrus grove from as early as 1929 through at least 1945 and continued to be used for row crop cultivation until at least 1953. By 1957, the Building 99 and 100 property was a parking lot and a trailer park with two possible residences. Harbor Trailer Park (388 Bay Boulevard) was located on this property from 1956 through 1976 (Haley & Aldrich, 2016a), at which time Buildings 99 and 100 were constructed on the property. Valley Detroit Diesel repaired semi-truck engines at this location starting in 1978. Rohr purchased Buildings 99 and 100 in 1986 from Valley Detroit Diesel. Rohr used the buildings primarily for administrative purposes (URS, 2013; Haley & Aldrich, 2016a). Test laboratories were housed in Building 100 until last year.

After 1953, the properties at 360, 364, and 368 Bay Boulevard were developed with mixed commercial/industrial and residential use. Businesses that occupied these parcels included aircraft parts manufacturing, refrigeration unit repair, storage, junkyards, and a veterinary hospital (Haley & Aldrich, 2016b). 360 Bay Boulevard was formerly used for auto maintenance and repair, auto dismantling, and salvaging that included a gold ore extraction/recovery operation. By the mid-1980s, the properties were acquired by the City of Chula Vista (City) and business operations ceased. Rohr has never used or conducted any operations on the three vacant Bay Boulevard properties (360, 364, and 368).

APN Address Property Name/Building
567-022-33 368, 368½ Bay
Boulevard
Mansell Marine Inc./So. Bay Marine & Boat (1956-1964)
San Diego Pump & Compressor (1964-1985)
Residential (1976-1985)
567-022-30 390 Bay Boulevard Valley Detroit Diesel/Buildings 99 and 100 571-330-29* 850 Lagoon Drive Building 29
3 1.2.2 Building 29 Area (South of G Street)
Building 29 was constructed in phases beginning in about 1957 through 1962 (URS, 2013; Haley & Aldrich, 2016a). The building was primarily used for tooling and machining and office space for most of its history. At one time, the northernmost portion served as the Maintenance Department for the facility. Most recently, the building housed laboratories, kitting, an Aftermarket Spares Warehouse, Service Center and FAI repairs, storage, tool calibration, product development, and office space.

Prior to Rohr’s ownership, the Building 29 area had a variety of other historical uses, including agriculture, a possible lumber yard, and residential. A former building (Building 28) was also built on the southern portion of Parcel A in the mid-1940s and served as a cafeteria and a warehouse. The building was located south of Building 29 and was demolished around 2000. The area is now occupied by a parking lot.

1.3 SITE FUTURE USE
Rohr sold the Building 99/100 and Building 29 portions of Parcel A to the Owner in September 2020.

The Owner purchased three adjoining vacant Bay Boulevard parcels in 2021. The Owner will be demolishing the northern portion of Building 29 to construct a loading dock to improve truck access. Up to approximately 5 feet of soil will be excavated to construct the loading dock. The remainder of Building 29 will be used by the Owner for commercial/industrial purposes. The Owner is also contemplating demolishing Buildings 99 and 100 and redeveloping this portion of the Site as well as the three adjoining vacant parcels to the north for surface parking. However, it is possible the buildings will be used for commercial/industrial use.

1.4 HHRA ORGANIZATION
The HHRA report sections are as follows:
 Section 1 – Introduction: provides a description of the Site location and general conditions;  Section 2 – Site Geology and Hydrogeology: provides an overview of the characteristics of the regional and local geology and hydrogeology;
 Section 3 – Previous Investigations: provides a summary of the previous Site assessments and investigations conducted by various environmental consultants;  Section 4 – Human Health Risk Assessment: presents a summary of the methodology and the results and uncertainties associated with the HHRA; and  Section 5 – Health-based Remediation Goals: includes the methodology used to derive health protective remedial goals for the Site.
4 2. Site Geology and Hydrogeology
This section summarizes the geology and hydrogeology that appears in the “Revised Conceptual Site Model, Rohr, Inc. – North Campus, Parcel A” (Parcel A CSM) submitted to the SDRWQCB on April 30, 2021, (Haley & Aldrich, 2021) and the “Revised Updated Sitewide Conceptual Site Model, Rohr, Inc. – North Campus” submitted to the SDRWQCB on February 25, 2022 (Haley & Aldrich, 2022b).

2.1 SITE GEOLOGY
Parcel A is situated at elevations ranging from approximately 13 feet above mean sea level on the south and 28 feet above mean sea level on the north. Parcel A is underlain, in descending order, by limited fill material, the Bay Point Formation, a clay aquitard, and the San Diego Formation. Because Parcel A is more than 1,000 feet upland of the former shoreline, there are no bay muds or extensive fill present on this portion of the North Campus facility. Geologic cross sections A-A’ (north-south) and B-B’ (east-west in the Former Maintenance Department) are provided as Figures 3 and 4.

2.1.1 Artificial Fill
Artificial fill generally consisting of yellow to brown, silty fine to medium sand with degraded asphalt and sub-angular fine gravel were observed during the Phase II Environmental Site Assessment (Phase II) and the data gap assessment (Haley & Aldrich, 2018a and 2020a). The maximum thickness of fill encountered was approximately 5 feet, in boring B29-33A.

2.1.2 Bay Point Formation
The Bay Point Formation can also be referred to as Quaternary alluvium, as suggested by Wes Danskin formerly with the United States Geological Survey (W. Danskin, pers. comm.). The thickness of the Quaternary sediment can be highly variable in the San Diego embayment, ranging from approximately 200 feet to possibly as much as 700 feet. The Bay Point is Pleistocene in age and was deposited in nearshore marine and onshore fluvial depositional environments.

The Bay Point Formation consists of an interbedded sequence of clay, silt, and silty sand to the total depth explored (approximately 30 feet). The strata are predominantly composed of reddish brown to yellowish brown clay and silt with some thin, discontinuous lenses of silty sand. The coarser-grained lenses are typically saturated below a depth of approximately 12 feet below ground surface (bgs).

2.1.3 Clay Aquitard
A blue-gray estuarine clay, designated as a “clay aquitard” occurs below the sandy interval at about 125 to 150 feet bgs (Huntley, 2000). The clay aquitard was identified during URS Greiner WoodwardClyde’s(URSGWC) San Diego Formation aquifer testing program (URSGWC, 1999). The clay aquitard varies in thickness from 20 feet to almost 40 feet. A blue-gray clay layer has also been encountered beneath the North Campus at a depth of approximately 125 to 150 feet bgs with a thickness of 20 to 65 feet. Although the aquitard materials encountered may differ in color at various locations throughout the North Campus and Former South Campus, the materials are characterized as clay with a low hydraulic conductivity.

5 2.1.4 San Diego Formation
There is a 20-foot-plus thick interval of coarse sands, gravels, and cobbles beneath the clay aquitard that is attributed to the San Diego Formation (Huntley, 2000). These strata were investigated during a drilling and aquifer testing program that Rohr conducted in 1998 and 1999 on behalf of the Sweetwater Authority to characterize the hydrogeology beneath the North Campus (URSGWC, 1999). These coarsergrained sediments were referred to as the Upper Gravel Unit in the URSGWC study and, based on geophysical logs and borehole flowmeter logging, Huntley suggested that the Upper Gravel Unit is the most productive zone investigated during this study (Huntley, 2000). The Upper Gravel Unit is underlain by a series of discontinuous lenses of fine to medium sands, silty sands, clayey sands, and silts and clays to a depth of at least 400 feet bgs (Huntley, 2000).

The San Diego Formation consists of two portions: the upper and lower members. The upper member of the San Diego Formation is present on the land surface in the vicinity of downtown San Diego and Chollas Creek but does not seem to be present or exposed in the South Bay, where the Site is located.

The upper member was deposited in a higher energy environment, closer to the continent; the lower member was deposited in a lower energy environment, typical of a deeper marine environment. The thickest section of the San Diego Formation is located adjacent to the southeastern edge of San Diego Bay, south of the Site.

The age of the San Diego Formation is less well defined but considered to be of the Plio-Pleistocene age.

Like the Quaternary sediment, the San Diego Formation was deposited in nearshore marine and onshore fluvial depositional environments. The contact with the overlying Quaternary alluvium is erosional and very difficult to distinguish in the subsurface and in geophysical logs. The term “San Diego Formation” has historically been used quite liberally, and in some instances, probably inaccurately. For example, marine mollusks present in the clay aquitard during URSGWC’s study were found to be Pleistocene age and part of the Quaternary sediments (Bay Point Formation).

Recent work by the United States Geological Survey indicates that San Diego Formation groundwater near the Sweetwater and Otay Rivers is isotopically enriched, reflecting the process of seawater intrusion (Anders et al, 2013). Furthermore, chloride concentrations decline within the saline section of the San Diego Formation at depths of about 500 to 820 feet bgs, indicating that the greatest quantity of regional groundwater recharge (originating in higher elevations to the east) may flow through the coastal aquifer at these depths.

2.2 SITE HYDROGEOLOGY
Because this HHRA focuses on soil and soil vapor on Parcel A, the discussion of Site hydrogeology is limited to depth and flow direction in the uppermost water-bearing zone (Zone A). Groundwater is present in the Bay Point Formation ranging in depth from approximately 10 to 20 feet bgs, based on observations during drilling and water levels in the wells that are north of Building 99. Boring logs for the direct-push borings and the monitoring wells are provided in the Revised Parcel A CSM. The locations of the borings and the existing and former monitoring wells are shown on Figure 5. The thickness of the vadose zone on Parcel A ranges from approximately 10 to 20 feet based on this information. The direction of groundwater flow is generally to the west. Wells present on Parcel A include the remaining wells installed for the San Diego Formation aquifer testing program that serve as upgradient wells (URSGWC, 1999). The two monitoring wells are north of Building 99. OW-3 is screened in Upper Zone B at 10 to 30 feet bgs, and OW-4 is screened in Lower Zone B at 60 to 80 feet bgs. A well cluster consisting of two wells (NCW-021A and NCW-021B) was installed during the Parcel A data gap investigation. The wells were recently sampled, and the analytical results will be included in AECOM’s next annual groundwater monitoring report.

6 3. Previous Investigations
Previous investigations at the Site that have included soil, soil vapor, and groundwater sampling are summarized in this section. Tables summarizing the analytical results for soil, sub-slab and deeper soil vapor, and groundwater samples are provided in Appendix A. Sample locations and historical environmental site features are shown on Figures 5 and 6, respectively.

3.1 FUEL UNDERGROUND STORAGE TANKS CLOSURES
In 1986, four fuel underground storage tanks (USTs) in the Building 99 and 100 Area were removed and closed under permit with the San Diego Department of Environmental Health (DEH). McLaren Environmental Engineering conducted a subsurface investigation prior to Rohr’s purchase of the property formerly occupied by Valley Detroit Diesel. Four groundwater monitoring wells (MW-A through MW-D) were installed on the perimeter of the Building 99 and 100 Area. Total recoverable petroleum hydrocarbon (TRPH) and volatile organic compound (VOC) concentrations in soil and groundwater were relatively low or not detected (Woodward-Clyde, 1998). In June 1996, the DEH provided Rohr with approval to destroy the wells.

3.2 350-360 BAY BOULEVARD SITE ASSESSMENT
The following summary is based primarily on information appearing in the “Data Compilation and Evaluation Report” prepared by Woodward-Clyde Consultants in 1998 ([WCC], 1998) and limited information in the DEH electronic library database. In October 1987, WCC conducted soil excavation, disposal, sampling, and analysis for the City related to petroleum hydrocarbons. Soil with petroleum hydrocarbon concentrations greater than 1,000 milligrams per kilogram ([mg/kg]; 85 cubic yards) was excavated and properly disposed of off-Site. Lead (greater than 200 mg/kg) was detected in surface soil at 350 Bay Boulevard, around the area believed to have been formerly used for gold ore extraction. A sample contained Soluble Threshold Limit Concentration (STLC) lead at a concentration of 20 milligrams per liter (mg/L), which was above the regulatory limit of 5 mg/L.

In 1988, when Rohr obtained an option to purchase these parcels, WCC collected 25 surface soil samples at random locations and installed and sampled three groundwater monitoring wells (MW-1B, -2B and MW-3B). Soil lead concentrations ranged from 75.2 to 16,400 mg/kg and STLC lead concentrations ranged from 1.0 to 538 mg/L. The lead concentration in groundwater in well MW-1B was below the Maximum Contaminant Level (MCL) of 0.050 mg/L. Trichloroethene (TCE) was also detected in well MW-2B at 14 micrograms per liter (µg/L).

In 1991, TorStan destroyed well MW-3B and characterized surface soil on the property for the City. Soil samples were analyzed for total and STLC lead (44 samples), organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), and dioxin and furans. Total lead concentrations in the samples analyzed ranged from 13.3 to 3,490 mg/kg. Three samples contained lead above the Total Threshold Limit Concentration (TTLC) of 1,000 mg/kg. STLC lead ranged from not detected (<0.275 mg/L) to 84.6 mg/L, and 24 samples contained STLC lead above the regulatory limit of 5 mg/L. The upper 80 percent confidence interval concentrations for TTLC and STLC lead were 399 mg/kg and 12.0 mg/L, respectively.

OCPs were detected in the 12 samples analyzed and included DDE and DDT at concentrations ranging from approximately 0.0075 to 0.0361 mg/kg, below the TTLC regulatory limit of 1.0 mg/kg for each compound. PCBs (as Aroclor 1254) were also present in 10 of the 12 soil samples at concentrations ranging from 0.063 to 2.585 mg/kg.
7 Four additional soil samples were analyzed for PCBs, and dioxin and furans. Two of the samples contained PCBs (Aroclor 1254 and 1260) at concentrations of 0.055 and 7.438 mg/kg. Dioxins and furans were detected in two of the four samples analyzed. Compounds detected included hexa, hepta and octa isomers; concentrations ranged from 3.2 to 1883.7 nanograms per kilogram (ng/kg). TorStan concluded that the concentrations of the isomers detected were below the TTLC for tetradioxins (10,000 ng/kg). Soil containing PCBs was excavated and properly disposed of off-Site under DEH oversight.

TorStan conducted quarterly groundwater monitoring of wells MW-1B and MW- 2B in 1991 and 1992.

No OCPs were detected in groundwater samples when analyzed during the first quarter 1991. TCE concentrations in well MW-2B were above the MCL of 5 µg/L during each monitoring event. According to DEH records, MW-2B was destroyed, but MW-1B could not be located. It is unclear if this well remains on the property.

In February 2001, the lead-containing soil was excavated across the property to a depth of 2 feet and 800 cubic yards of lead-containing soil was removed and consolidated with burn ash from the Shinohara Burn Site on Otay Valley Road. The materials were used as part of the foundation of the cap for the former Otay Class I Landfill operated by San Diego County. This landfill was permitted to accept hazardous waste. Confirmation soil samples were collected from the perimeter and the floor of the excavation at random locations. The mean total lead concentration of the confirmation samples was 54 mg/kg, and the upper 95% confidence interval was 71 mg/kg. A No Further Action (NFA) letter was provided to the City by the DEH Voluntary Assistance Program on September 17, 2001.

3.3 1998 PHASE I ENVIRONMENTAL SITE ASSESSMENT
Adrian Brown was retained to conduct a Phase I of the Rohr facility in 1998 (Adrian Brown, 1998) in compliance with the 1998 CAO issued by the SDRWQCB. In this Phase I, Adrian Brown identified possible Site environmental features potentially containing hazardous substances and petroleum products such as process lines, sewers, sumps, drains, storm sewers, tanks, storage vessels, equipment vaults, degreasers, waste treatment storage areas, and chemical use areas. The historical environmental features identified by Adrian Brown are included on Figure 6.

3.4 SAN DIEGO FORMATION AQUIFER TESTING
In 1998 and 1999, URSGWC conducted a drilling program to assess subsurface geology and hydrogeology of the San Diego Formation at the Rohr Site (URSGWC, 1999). These data were collected to support the redesignation of the groundwater basin uses from beneficial to non-beneficial for the area west of Interstate 5. The drilling program identified subsurface geology to a depth of approximately 550 feet and evaluated the vertical hydraulic connection between shallow groundwater and a deeper, coarse-grained gravel zone identified at 180 to 200 feet bgs by conducting aquifer testing. In addition to the five wells installed (DB-2, DB-4, DB-5, OW-3, and OW-4), two pressure transducers (OW-1 and OW-2) were installed in separate grouted boreholes to monitor changes in pressure within the aquitard during aquifer testing. Three wells (DB-2, DB-4 and DB-5) and the two transducers (OW-1 and OW-2) were destroyed under permit with the DEH in late 2020. Wells OW-3 and OW-4, screened in Upper Zone B and Lower Zone B, respectively, remain for monitoring purposes.

Groundwater use remains beneficial west of Interstate 5. 8 3.5 BLANCHARD GRINDER UNDERGROUND STORAGE TANK CLOSURE The former Blanchard Grinder UST (Rohr Tank No.3-09598) was in the tooling area in the southern portion of Building 29. The machine sat on a metal plate above a concrete sump that served as a reservoir for coolant that was used to circulate through the unit while operating. URSGWC drilled soil borings in 1999 adjacent to the structure and analyzed the samples for TRPH. None were detected.

Based on the results, the DEH approved in place closure of this former sump.

3.6 2013 URS SUPPLEMENTAL REMEDIAL INVESTIGATION
URS conducted a Site investigation as part of environmental due diligence associated with United Technologies Corporation’s purchase of Goodrich Corporation (URS, 2015). The results of the investigations were compared to industrial/commercial screening criteria consistent with the Site’s commercial/industrial use. One boring was drilled in the vicinity of the former Blanchard Grinder (boring UT-22) to collect soil and groundwater samples for VOC analysis, since the feature formerly used coolant. No VOCs were detected in soil samples from boring UT-22. The reported groundwater TCE concentration was 42 μg/L.

No VOCs or PCBs were detected in soil samples from the other borings drilled on the Building 29 portion of Parcel A. Polycyclic aromatic hydrocarbons (PAHs) were present in boring UT-18 in the railroad rightof-way drainage swale. The PAHs were detected in the drainage swale east of the railroad tracks in surface soil samples collected from 0.5 to 1 foot bgs; however, this is not part of the Site.

TCE was reported in groundwater in borings UT-22, UT-23, and UT-24 at concentrations of 42, 520 and

4.7 μg/L, respectively. No PCBs or PAHs were detected in groundwater at concentrations greater than a State of California MCL, except for boring UT-18, located in the drainage swale adjacent to the railroad line in the Building 29 area that is not part of the Site. Total petroleum hydrocarbons (TPH) were detected in borings UT-19 and UT-21 at concentrations of 860 and 1,300 μg/L, respectively. No Title 22 Metals (except for thallium) or hexavalent chromium were detected in groundwater above their respective MCLs on the Building 29 portion of Parcel A.

3.7 2016 HALEY & ALDRICH PHASE I AND IIs
Following completion of Phase I Environmental Site Assessments (Phase I), Haley & Aldrich conducted supplemental Phase II) in 2016 to investigate soil and groundwater on the Building 99 and 100 and Building 29 Areas (Haley & Aldrich, 2018a) and the vacant Bay Boulevard properties that were described as Parcel A [Haley & Aldrich, 2018b]). The locations of the borings advanced during the Phase IIs are shown on Figure 5. A summary of the findings for each of the Phase IIs conducted by Haley & Aldrich are described below.

3.7.1 Buildings 29, 99, and 100
Haley & Aldrich advanced 25 soil borings and analyzed samples for the following chemicals of potential concern (COPCs): TPH, VOCs, semi-volatile organic compounds (SVOCs [phenols and polynuclear aromatic hydrocarbons]), OCPs, PCBs, and Title 22 Metals. None of the soil samples analyzed for TPH, VOCs, SVOCs, or OCPs contained an analyte at a concentration above its respective commercial/industrial Department of Toxic Substances Control (DTSC) screening level (DTSC-SL) except for one sample (B29-05-02) collected at 2 feet bgs that contained the PCB Aroclor 1260 (1,300 micrograms per kilogram [µg/kg]) above its commercial/industrial DTSC-SL of 580 µg/kg. None of the samples contained any COPCs at a concentration above its groundwater protection level (GPL) or TTLC. 9 Arsenic was reported in soil at three locations (B29-02, B29-03, and B29-07) on the northern portion of the Building 29 Area at concentrations greater than the Site-specific background threshold of 8 mg/kg (established for the Former South Campus), but below the Site-specific GPL of 24.3 mg/kg. None of the other Title 22 Metals were present in soil at concentrations exceeding screening criteria described in Section 4. No environmental concerns were identified in soil or groundwater in the Building 99 and 100 Area.

3.7.2 Vacant Bay Boulevard Properties
Haley & Aldrich advanced 27 soil borings and analyzed 49 soil and nine groundwater samples for COPCs.

Of the borings advanced and samples analyzed, there were 11 borings advanced, and 22 samples analyzed specific to 350, 360, 364, and 368 Bay Boulevard. COPCs included TPH, VOCs, PAHs, OCPs, and Title 22 Metals. None of the soil samples analyzed was reported to exceed a GPL, commercial/industrial DTSC-SL, or TTLC for the COPCs identified. One sample collected from BB-23 was reported to contain DDE at its TTLC of 1 mg/kg. Two in-situ groundwater samples from BB-17 and BB-23 were reported to contain arsenic slightly above the MCL of 0.010 mg/L (0.0149 and 0.0122 mg/L, respectively). The presence of low levels of arsenic in groundwater is likely naturally occurring and attributed to background.

3.8 2018 SUB-SLAB AND FOCUSED SOIL VAPOR SURVEY
In May 2018, and in preparation for the property sale, a soil vapor survey was conducted in Buildings 29, 99, and 100 in accordance with the California Environmental Protection Agency’s “Advisory Active Soil Gas Investigations” dated July 2015 (Haley & Aldrich 2018c). Sub-slab sample locations were selected considering past Site use and previous subsurface VOC soil and groundwater concentrations. The soil vapor samples were analyzed by a mobile laboratory using U.S. Environmental Protection Agency (EPA) Method TO-15. The temporary vapor probe locations are shown on Figure 5.

Analytical results for sub-slab soil vapor samples are summarized in Appendix A. VOCs were identified in sub-slab soil vapor samples collected beneath the slab of Building 29 and in the deeper soil vapor samples. Samples were collected at a depth of 1 foot below the slab. TCE was detected in 10 of the 17 sub-slab soil vapor sample locations beneath Building 29 at concentrations ranging from 42 to 920,000 micrograms per cubic meter (µg/m3
). The highest TCE concentration in the sub-slab soil vapor samples was detected at probe B29-V03.

Deeper soil vapor data are summarized in Appendix A. The deeper soil vapor samples were collected at depths of 5 and 10 feet below the slab in the former Maintenance Department, since groundwater beneath this area contains VOCs. TCE was detected in each of the deeper samples collected beneath and in proximity to Building 29 except for samples from probe B29-V05. TCE concentrations ranged from 100 to 3,000,000 µg/m3 in the 5-foot samples, with the highest concentration detected in probe B29-V03. TCE was detected in three of the four soil vapor samples collected at 10 feet (just above the level of groundwater) at lower concentrations, ranging from 64 to 3,400 µg/m3 . This suggested that TCE
in soil vapor was related to a shallow soil source. Based on these findings, Haley & Aldrich recommended supplemental indoor air and potential preferential pathway screening in the building.

The SDRWQCB concurred with our recommendations.

Relatively low concentrations of some VOCs were reported in soil vapor samples collected beneath Buildings 99 and 100. None of the VOC concentrations exceeded screening criteria and as such, are not considered to pose an immediate potential health concern. 10 3.9 2018-2019 INDOOR AIR SCREENING
In September 2018, Haley & Aldrich conducted indoor air screening in Building 29 to evaluate whether total VOCs and TCE may be present in indoor air (Haley & Aldrich 2018d). The screening was based on locations where TCE had been detected in soil, shallow groundwater, sub-slab soil vapor, and near slab penetrations that could serve as preferential subsurface vapor migration pathways. Air grab samples were screened using a photoionization detector and Hapsite gas chromatograph. It should be noted that the measurements represent a moment in time rather than a time-weighted average concentration over an 8- or 10-hour workday. The results were only used for screening purposes and to determine if interim mitigation measures were warranted prior to implementing building improvements (beyond sealing potential preferential pathways for vapor intrusion). The results of the indoor air screening indicated no immediate interim measures appeared to be required for Building 29.

TCE screening results for September 2018 are summarized in the Revised Parcel A CSM for the breathing zone and preferential pathways, respectively. The TCE screening results ranged from 0.012 µg/m3 to 2 µg/m3
, except for two locations where 4.2 µg/m3 and 5.5 µg/m3 were measured in the breathing zone near utility trenches in proximity to a floor slab crack, suggesting that potential preferential pathways may be contributing to TCE screening results observed in indoor air. None of the results were greater than the EPA Region 9 Indoor Air Response Action Level of 8 µg/m3 for TCE, also identified by DTSC as the commercial/industrial worker accelerated response action level assuming an 8-hour workday. No immediate interim measure was required in the building. However, there were several samples in the building where the TCE screening results were greater than the lower end of the health protective risk range for the 8-hour workday for a commercial/industrial worker (3 µg/m3 ). This concentration is based
on a 1 x 10-6 risk threshold assuming chronic long-term exposure.

Indoor air screening was conducted again in February 2019 at the same locations based on DTSC guidance (Haley & Aldrich, 2019). Doors and windows that are typically open were closed in February.

There were six locations in the northern portion of Building 29 where TCE screening results in the breathing zone were greater than the accelerated response action level for the commercial/industrial 8-hour workday 8 µg/m3
). TCE screening results at six additional screening locations in the northern half of Building 29 were greater than the lower end of the health protective risk range for the 8-hour workday for a commercial/industrial worker (3 µg/m3
). As an immediate action, Rohr increased air
circulation by keeping fans operating and doors opened. In September 2019, Haley & Aldrich sealed cracks and joints in the slab in the former Maintenance Department.

3.10 2020 DATA GAP ASSESSMENT
A data gap assessment was conducted in January 2020 to further characterize the nature and extent of VOCs in soil and groundwater and conduct some step-out sampling in areas where arsenic and PCBs had been detected above screening levels during the Phase II (Haley & Aldrich, 2018a; 2020a). Arsenic was detected in soil at concentrations slightly greater than the GPL of 24.3 mg/kg in step-out boring B29-07A (24.6 mg/kg). The other step-out samples analyzed contained arsenic concentrations less than the GPL.

PCBs were not detected in soil at concentrations greater than the commercial/industrial DTSC-SLs in soil samples collected from the step-out borings for boring B29-05.

Several borings were advanced in the former Maintenance Department to identify the potential source of TCE in soil vapor and groundwater beneath this area. Soil samples B29-24-010 and B29-23-010 were collected at 1 foot bgs beneath the former Maintenance Department. The samples contained TCE at concentrations greater than the EPA Region 9 commercial/industrial Regional Screening Level (there is no DTSC-SL) of 6 mg/kg (7.83 and 37.8 mg/kg, respectively). TCE in soil sample B29-23-010 also 11 exceeded the GPL of 27 mg/kg. Groundwater analytical results indicated that TCE was present at up to 1,490 μg/L in boring B29-23 beneath the former Maintenance Department. It is our understanding that a relatively small degreaser, once located in this area, appears to have been the source of TCE and other VOCs detected in soil, soil vapor, and groundwater in this area. None of the soil samples contained a concentration of a COPC (as identified in Section 4 of this HHRA) above its respective TTLC.

Step-out borings were also conducted around the former mill and lathe locations. None of the COPCs in soil (as identified in Section 4 of the HHRA) were reported at concentrations above GPLs, commercial/industrial DTSC-SLs, or TTLCs.

3.11 2020 GSI PHASE II SCREENING INVESTIGATION
GSI Environmental, Inc., (GSI) conducted a Phase II screening investigation on Parcel A (excluding 350, 360, 364, and 368 Bay Boulevard) in August 2020 on behalf of the new Owner (GSI, 2020). The investigation included additional soil and soil vapor sampling and analyses.

Tetrachloroethene (PCE) was detected in PW-12 in soil at a concentration of 4.7 µg/kg at 1.5 feet bgs, and TCE was detected in PW-07 at a concentration of 23 µg/kg at 1.5 feet bgs. PCE and TCE were not detected above laboratory reporting limits in other soil samples. PCBs (Aroclor-1260) were only detected in PW-11, at a concentration of 180 µg/kg. PCBs in other samples analyzed were not detected at concentrations greater than the reporting limits. No analytes were detected in soil samples at concentrations exceeding GPLs, commercial/industrial DTSC-SLs, TTLCs, or background soil concentrations for arsenic.

Seventeen soil vapor samples (including two duplicate samples) were collected at 15 locations from depths between approximately 3 and 5 feet bgs and analyzed for VOCs. TCE was the constituent detected at the highest concentrations in both GSI and Haley & Aldrich soil vapor assessments. GSI concluded that the soil analytical results did not indicate a need for additional assessment on Parcel A, and the soil vapor results were generally consistent with the data collected by Haley & Aldrich in 2018.

The samples collected in 2020 were not co-located with the samples collected in 2018. These two sampling events represent the distribution of impacts beneath and in proximity to Building 29.

Contaminant releases to the subsurface beneath Building 29 are historical, occurring decades ago; there are no ongoing contaminant releases associated with current on-Site operations at Building 29.

The apparent differences in concentrations beneath portions of Building 29 may be associated with the distribution of subsurface impacts at the various identified environmental features and seasonal differences such as temperature, soil moisture and barometric pressure.

3.12 2020 PARTNER PHASE I FOR 350, 360, 364 AND 368 BAY BOULEVARD Partner Engineering and Science, Inc. (Partner) conducted a Phase I for the property buyer in late 2020 (Partner, 2020). Partner concluded that the parcels had a recognized environmental condition, since they are part of the ongoing larger Eastern Parcels (Parcel A, Case Number T10000011095) investigation under the oversight of the SDRWQCB. It should be noted that the Eastern Parcels initially included the vacant Bay Boulevard Properties; because Rohr had decided that it would retain them.

With the new Owner’s plan to purchase 360, 364 and 368 Bay Boulevard, it was requested that the SDRWQCB include these parcels in Parcel A once again.
12 3.13 2022 DATA GAP INVESTIGATION
Haley & Aldrich submitted a Data Gap Investigation Work Plan (Work Plan) for Building 29 to the SDRWQCB on November 5, 2021, to meet Directive C.2.a of the CAO. The Work Plan was subsequently revised (Revised Work Plan) at the request of the SDRWQCB and resubmitted on January 21, 2022 (Haley & Aldrich, 2022a). Haley & Aldrich implemented the Revised Work Plan in March 2022 and submitted a report to the SDRWQCB dated June 10, 2022. The results of the data gap investigation indicated the following:

Soil: TCE exceeding the heath-based remediation goal (HBRG) in the former Maintenance Department in the northern portion of Building 29 has been delineated. None of the samples collected from the step-out borings (DGA-024, DGA-025, and DGA-026) were reported to contain TCE or other VOCs at concentrations above its respective HBRG, commercial/industrial DTSC-SL, GPL, or TTLC. Based on the data for the former Maintenance Department, the area with soil impacts is limited to depths less than 4 feet bgs. VOC concentrations beneath the central and southern portions of Building 29 were either not detected in soil, or the concentrations were relatively low, supporting that soil is not a significant VOC source contributing to those present in soil vapor.

Soil Vapor: Based on the Owner’s intent to construct the new loading dock and manage TCE-containing soil by implementing a Demolition and Environmental Monitoring Plan and manage VOCs in soil vapor through installing a sub-slab depressurization system (SSDS) and implementing a Risk Management Plan (RMP), Haley & Aldrich recommended that no further soil vapor investigation be conducted at this time.

Groundwater: The VOCs in groundwater detected at the four locations sampled during the data gap investigation were relatively low, delineating groundwater impacts beneath Building 29 in the former Maintenance Department where there are TCE soil and soil vapor impacts, and the central and southwestern portion of the building where there are lesser groundwater and soil vapor impacts. Based on these and previous groundwater analytical results, groundwater off-gassing appears to contribute to the VOCs reported in soil vapor beneath the northern and southwestern portions of Building 29. The potential for future vapor intrusion risk to building occupants will be addressed by installing the SSDS and implementing the RMP previously described.

Groundwater monitoring was recently conducted in well cluster NCW-021 by AECOM in accordance with the Revised Work Plan. Analytical results for the parameters indicated in the Revised Work Plan will be included in the next annual groundwater monitoring report.

13 4. Human Health Risk Assessment
Potential human health risks were estimated for on-Site human receptors, assuming the Site will be used for commercial/industrial purposes. As stated earlier, the Owner will be demolishing approximately 24,000 square feet of the northern portion of Building 29 to construct a loading dock to improve truck access. Up to approximately 5 feet of soil will be excavated to construct the loading dock.

The remainder of Building 29 will continue to be used for commercial/industrial use. Buildings 99 and 100 may be used for commercial/industrial purposes or may be razed and the area redeveloped for surface parking. Both scenarios have been evaluated in this HHRA.

The overall approach used in the HHRA was based on current EPA (EPA 1988; 1989; 1990; 1991a,b,c; 1992a,b,c,d; 1996; 1997; 2001; 2002a,b; 2009; 2014; 2019) and DTSC (DTSC 1993, 2011, 2015, 2019a,b, and 2020b) guidance documents.

The methodology and assumptions used in the HHRA calculations presented herein are consistent with those presented in the revised April 20, 2018, “Human Health Risk Assessment Update” (HHRA Update) prepared for the Rohr Former South Campus property adjacent south of the Site (Haley & Aldrich, 2018b). The HHRA Update was submitted to California Office of Health Hazard Assessment (OEHHA) and SDRWQCB. The methodology presented in the HHRA Update was used to obtain NFA determinations on that property in a letter dated May 4, 2022. The methodology was also used in the “H Street Extension Cleanup and Abatement Completion Report, Former South Campus” prepared by Haley & Aldrich and dated March 23, 2015 (Haley & Aldrich, 2015b) and the “Final Cleanup and Abatement Completion Report Soil Remediation, Exchange Parcel - Former South Campus Facility” prepared by Haley & Aldrich and dated February 4, 2015 (Haley & Aldrich, 2015a). On March 12, 2015, and December 15, 2015, the SDRWQCB issued letters of NFA for the Exchange Parcel and H Street vadose zone soils, respectively (SDRWQCB, 2015a and 2015b). This HHRA was conducted following similar methodology with the following exceptions. More recent default exposure parameters and toxicity values published by the EPA and DTSC were used in this HHRA. In addition, the vapor intrusion evaluation in this HHRA was conducted following the “Human Health Risk Assessment (HHRA) Note 4, Human and Ecological Risk Office (HERO) Guidance for Screening Level Human Health Risk Assessments,” (HERO Note 4) prepared by the DTSC dated March 29, 2022 (DTSC, 2022).

An HHRA is conducted in four steps: 1) hazard identification; 2) exposure assessment; 3) toxicity assessment; and 4) risk characterization. A description of these steps is provided below.  Hazard Identification includes an evaluation of the adequacy of the data to identify COPCs at the Site and identifies the COPCs and data used in the HHRA.  Exposure Assessment includes a review of the most sensitive receptors at the Site and their possible exposure pathways (i.e., how receptors may come into contact with the COPCs at the Site). This assessment is summarized in a Conceptual Site Model (exposure pathway evaluation). The exposure assessment also includes an estimate of the chemical concentrations to which each receptor may be exposed.
 Toxicity Assessment identifies the relevant toxicity values for the COPCs.  Risk Characterization summarizes of the estimated human health risk results for each receptor and exposure area and the associated risk uncertainties. 14 4.1 HAZARD IDENTIFICATION
The objective of the hazard identification step is to evaluate available data to characterize the Site and identify COPCs. Soil, sub-slab soil vapor, soil vapor, and groundwater samples have been collected from the Site at and in proximity to historical operations where chemicals were used and stored. The samples were collected over multiple Site investigation events and analyzed for chemicals associated with the historical on-Site operations to assess the nature and extent of impacts.

The EPA and the DTSC have published guidance on selecting COPCs for risk assessment purposes. Key regulatory documents that include this guidance are, but not limited to, the following:
 EPA, 1989. “Risk Assessment Guidance for Superfund, Volume I, Human Health Evaluation Manual (Part A), Interim Final. December 1989” (RAGs Part A; EPA, 1989); and  DTSC, 2015. “Preliminary Endangerment Assessment Guidance Manual (A guidance for evaluating hazardous substance release sites),” January 1994, Revised October 2015 ([PEA Manual]; DTSC, 2015).

These documents provide guidance for selecting COPCs at hazardous substance release sites for evaluation, more specifically, those site-related chemicals to be evaluated in the HHRA process. Section

2.4.5.7 of the PEA Manual indicates that “all chemicals that are not eliminated by previously described evaluations should be considered COPCs for the site and should be evaluated further through the PEA screening evaluation.” The evaluations noted as “previously described” in the PEA Manual primarily include the background evaluation. The intent of the background evaluation is to distinguish siterelated contamination from naturally occurring or anthropogenic contamination. Anthropogenic contamination is described as contamination that “may arise when an off-site source has contributed to the on-site contamination, the site is part of a regional contamination problem, or the site-related contaminants are the same as certain ubiquitous, manmade chemicals.” The PEA Manual provides a process for eliminating chemicals as COPCs that are within “background” and are therefore not considered to be “site-related.” RAGs Part A describes an optional process that may be followed for further reducing the number of COPCs based on a low frequency of detection and low toxicity compared to other site-related chemicals.

The HHRA prepared for Parcel A used a conservative approach for selecting COPCs. This approach was inclusive, as opposed to exclusive. The only chemicals eliminated as COPCs were those metals with maximum or 95% Upper Confidence Limit (95% UCL) concentrations less than the SDRWQCB-approved site-specific background threshold. No other background sources were used to exclude COPCs.

Although the PEA Manual indicates that anthropogenic contamination (from off-site sources or ubiquitous man-made chemicals) may be eliminated from consideration, chemicals that may be present due to activities unrelated to on-site industrial operations were nonetheless included as COPCs. In addition, no chemicals were eliminated due to a low frequency of detection or low toxicity. Organic chemicals detected in at least one sample were included as COPCs for the media in which that chemical was detected. COPCs were identified for soil and soil vapor.

In general, and similar to the South Campus HHRAs, the Site-related COPCs evaluated in this HHRA include detected organic chemicals in soil, sub-slab soil vapor, and soil vapor as well as metals (inorganic chemicals) detected at concentrations greater than Site-specific background threshold in soil. COPCs were selected for each exposure area evaluated.

15 As indicated in Section 4.2, vadose zone soil sample results within the upper 10 feet bgs were used to assess direct exposure pathways. Soil vapor sample results were used to assess exposure based on the vapor intrusion into buildings. Sub-slab soil vapor samples were collected beneath the foundation of each building. COPCs were therefore identified for sub-slab soil vapor samples (within and adjacent to the building footprints) as opposed to the deeper soil vapor samples collected beneath or adjacent to the buildings. COPCs were also identified by the soil vapor samples collected by GSI (within and adjacent to the building footprints), since they did not collect co-located sub-slab soil vapor samples.

Locations B29-V03, PW-02, and PW-03 were not considered for selecting COPCs. These sample locations were in the area of Building 29 that will be excavated for construction of a loading dock, and other samples collected either within or closer to the portion of Building 29 that will remain were considered more representative for selecting COPCs.

For the purposes of this HHRA, it was assumed that potential dermal contact or ingestion of groundwater beneath the Site is not complete since groundwater is encountered deeper than 10 feet bgs at the Site and will therefore unlikely be encountered by the on-Site receptors. In addition, groundwater beneath the Site has relatively high total dissolved solids, sodium, and chloride concentrations. Any occupants of the Site will be provided drinking water for consumption and other uses via municipal water supply by the Sweetwater Authority. Potential exposure from the use of groundwater for municipal purpose (e.g., drinking water) was not evaluated in this HHRA, nor was it evaluated in the previous HHRA for the former South Campus property referenced in this HHRA.

4.1.1 Organic Chemicals of Potential Concern
Organic chemicals detected at concentration greater than laboratory detection limits in one or more vadose zone soil (within the upper 10 feet bgs), sub-slab soil vapor samples, and/or the GSI soil vapor samples (herein collectively referred to as soil vapor) are considered COPCs. COPCs were identified separately for soil and soil vapor. A list of the organic chemicals identified as COPCs in on-Site vadose zone soil (within the upper 10 feet bgs) and soil vapor samples is presented in Table 1.

4.1.2 Inorganic Chemicals of Potential Concern
Inorganic compounds that were reported at concentrations greater than SDRWQCB-approved Sitespecific background thresholds were considered COPCs. The Site-specific background thresholds for metals in soil were presented in the following documents:
 “Human Health Risk Assessment, South Campus Facility, Chula Vista, California,” prepared by Haley & Aldrich, and dated July 2007, revised 26 April 2012; and  “Hexavalent Chromium Soil Background Evaluation, South Campus Property, Chula Vista, California,” prepared by Haley & Aldrich, and dated 8 August 2013.

Prior to the sale of the Former South Campus to the San Diego Unified Port District by Rohr in 1999, the North and South Campuses were part of a single manufacturing facility. The soil characteristics and geology are similar both north and south of H Street on the North and South Campuses, respectively.

Both sites are underlain by undocumented and dredged fill and Bay Deposits on the west and the Bay Point Formation east of the former shoreline in landside areas. In general, the native materials that consist of Bay Deposits or the Bay Point Formation beneath the North and South Campuses have similar characteristics. Both lithologies are fine grained, composed primarily of silt and clay as described in the boring logs provided in Appendix A of the Revised Parcel A CSM (Haley & Aldrich, 2021). For these reasons, the soil background evaluation conducted for the Former South Campus is relevant and applicable to the North Campus. Thus, these soil background threshold concentrations were used in the 16 HHRA to assess which metals on the North Campus are present at concentrations greater than background and were considered COPCs that were further evaluated in the HHRA. Background metals concentrations for soil are summarized in Table 2. A list of the inorganic chemicals identified as COPCs in on-Site vadose zone soil (within the upper 10 feet bgs) is presented in Table 1.

4.2 EXPOSURE ASSESSMENT
The objective of the exposure assessment is to estimate the magnitude, frequency, duration, and routes of reasonably anticipated human exposure to COPCs to anticipated future use of the Site. The exposure assessment is based on anticipated potential on-Site receptors and associated potentially complete exposure pathways that define the conditions of potential exposure to Site-related COPCs. The receptors and assessment of potentially complete exposure pathways are shown on Figure 7.

Human health risks were estimated for significant potentially complete exposure pathways. An exposure pathway is considered potentially complete for a receptor if it has the following elements:
 A contaminant source;
 A retention medium and transport mechanism;
 A point of potential human contact with the contaminated medium; and  An exposure route at the exposure point.

If any of the required elements are absent, the exposure pathway is considered incomplete (i.e., no exposure will occur) and has no associated health risks (i.e., health risks will be zero for that exposure pathway). An exposure pathway may also be considered insignificant, if based on professional judgment, the magnitude of exposure is low, the probability of the exposure occurring is low, and risks associated with the occurrence are not high (EPA, 1989). These criteria render an exposure pathway insignificant, and it is concluded that the associated human health risks for that exposure pathway would not significantly contribute to the overall health risks. Estimated human health risks are not quantified in an HHRA for insignificant exposure pathways.

Potentially complete exposure pathways are discussed below in Section 4.2.1. Once the potentially complete exposure pathways have been identified, the quantification of chemical intake for each receptor requires an estimate of:
 Each COPC concentration the receptor may be exposed to (also referred to as an exposure point concentration [EPC]);
 The absorption of each COPC into the human body once exposed via the complete and potentially complete exposure pathways;
 The frequency and duration of contact for the complete and potentially complete exposure pathways; and
 The biological characteristics of the receptor.

4.2.1 Conceptual Site Model
Figure 7 identifies the potential chemical exposure pathways (i.e., ways that people could potentially be exposed to the COPCs in soil and soil vapor) at the Site. The Site was evaluated as two separate exposure areas, referred to as the Building 99/100 exposure area and the Building 29 exposure area, since these two areas are separated by G Street.
17 The Building 29 exposure area, located south of G Street, is approximately 9.5 acres and, as stated previously, will continue to be used for commercial/industrial uses. As stated previously the Owner will be demolishing approximately 24,000 square feet of the northern portion of Building 29 and up to approximately 5 feet of soil will be excavated for the construction of a loading dock adjacent to the building. The remainder of Building 29 will continue to be used for commercial/industrial use.

The Building 99/100 exposure area is approximately 5.2 acres north of G Street and includes the vacant properties at 360, 364, and 368 Bay Boulevard. These properties have been combined into a single exposure area since they will be developed as one property. The Owner may be demolishing Buildings 99 and 100 and may be redeveloping this portion of the Site as well as the three vacant parcels for surface parking, which is also considered to be a commercial/industrial land use. An exposure-areaspecific HHRA was performed for each of these two exposure areas.

Worst-case human receptors (i.e., receptors with the highest potential exposures to on-Site chemical impacts) for each of the two on-Site exposure areas are identified as follows:
 On-Site construction worker, within the planned excavation area to construct a loading dock at the northern portion of Building 29 (approximately 24,000 square feet) and within the Buildings 99/100 exposure area;
 On-Site landscaper (including utility worker); and
 On-Site commercial/industrial worker.

These three receptors are relevant for the current and planned future use of the property and were also evaluated in the HHRAs for South Campus. The exposure characteristics of each receptor are presented in Table 3. A description of each of the on-Site receptors is provided below.

4.2.1.1 On-Site Construction Worker
The future on-Site construction worker is assumed to work outside during on-Site redevelopment activities (as discussed above) that occur after removing on-Site paving and structures when surface soils are exposed and/or on-Site grading is being conducted. It is assumed that the on-Site construction worker is present on-Site in each of the two exposure areas for 8 hours each day, 5 days per week for 50 weeks over one year and may be exposed to vadose zone soil.

The potentially complete exposure pathways identified for the on-Site construction worker are:
 Incidental ingestion of vadose zone soil;
 Dermal contact with vadose zone soil;
 Inhalation of fugitive dust generated from windborne vadose zone soil; and  Inhalation of vapors emanating into ambient air from vadose zone soil.

4.2.1.2 On-Site Landscaper (Including Utility Worker)
The Site will not be redeveloped (other than the future loading dock and the possible demolition of Buildings 99 and 100 for surface parking noted above) but will retain the remaining portion of the existing Building 29 and possibly existing Buildings 99 and 100 and limited landscaped areas. The only portions of the Site that are unpaved are those limited landscape areas located on the eastern portion of the Site adjacent to Bay Boulevard, and those adjacent to the north and south side of G Street. 18 Receptors that may have direct contact with this soil will be on-Site landscape workers. Soil underlying the paved areas may also be contacted during subsurface utility maintenance activities. It is assumed that the on-Site landscaper and utility worker only work outside and will not work within the on-Site buildings. It is further assumed that both the on-Site landscaper and the on-Site utility worker will work in each of the two identified exposure areas and that they may potentially be exposed to soil across each of those exposure areas.

The on-Site landscaper has a higher potential exposure than an on-Site utility worker, whose potential exposure is likely over fewer days per year and over fewer years than the on-Site landscaper. The estimated health risk to an on-Site landscaper would therefore be higher than the estimated health risk to an on-Site utility worker. Chemical concentrations protective for the on-Site landscaper would therefore also be protective for the on-Site utility worker, so estimated human health risks were only quantified for the on-Site landscaper.

The potentially complete exposure pathways for the on-Site landscaper (and on-Site utility worker) include:
 Incidental ingestion of vadose zone soil;
 Dermal contact with vadose zone soil;
 Inhalation of fugitive dust generated from windborne vadose zone soil; and  Inhalation of vapors emanating into ambient air from vadose zone soil.

It is assumed that an on-Site landscaper will work at the Site for 8 hours each day, 2 days per week for 50 weeks over 25 years.

4.2.1.3 On-Site Commercial/Industrial Worker
It is conservatively assumed that the on-Site commercial/industrial workers may work inside the commercial/industrial buildings and would have insignificant exposure to soil within the landscape areas. The only potentially complete exposure pathway evaluated in this HHRA for the commercial/industrial worker is VOC inhalation in indoor air, based on the subsurface vapor intrusion pathway. It is assumed that the on-Site commercial/industrial worker is present on-Site for 8 hours each day, 5 days per week for 50 weeks each year for 25 years.

4.2.2 Exposure Point Concentrations
Deriving estimates of chemical concentrations at points of potential human exposure is necessary to derive chemical intakes for potentially exposed individuals (i.e., human receptors). These chemical concentrations at the locations where potential exposure may occur are referred to as EPCs. It was assumed for this HHRA that exposures to on-Site vadose zone soil occur within 10 feet bgs.

4.2.2.1 Overview of Data Selection for Derivation of EPCs Developing long-term EPCs from the investigation data includes an underlying assumption about the representativeness of the data, both temporally and spatially. EPCs were calculated under the assumption that environmental concentrations would remain constant at the levels detected during the investigation activities for an indefinite period. It was therefore assumed that the data considered representative of current Site conditions simulates current and future exposure conditions for a receptor having potential exposure to impacted media at the Site. Organic chemicals naturally degrade 19 in the environment, which results in the reduction of concentrations over time. However, it is conservatively assumed that no degradation mechanisms will occur. This assumption of steady-state concentrations for each COPC will result in a conservative estimation of long-term exposure concentrations.

To simulate a receptor’s spatially and temporally integrated exposure, EPA (1992, 1997, 2002b) defines the EPC used to estimate the reasonable maximum exposure (RME) as the 95% UCL, or the maximum observed concentration, whichever is lower. The arithmetic mean reflects the assumption that exposure by the receptor is averaged as they traverse an area over time. The intent of the RME scenario is to focus the assessment on a conservative exposure within the range of exposures. The 95% UCL concentrations in soil samples were calculated using EPA ProUCL version 5.1.002 software. The results of these calculations presented in the software output, including the EPA recommended 95% UCL concentrations, are presented in Appendix B.

4.2.2.1.1. Soil
For each COPC in soil, its EPC was initially conservatively assumed to be its maximum detected concentration reported in that exposure area. After evaluating the contribution of each chemical to the cumulative risk, the EPC for each COPC that contributed significantly to human health risk was revised to its maximum concentration or 95% UCL, whichever was lower, provided there were sufficient data available to calculate a 95% UCL. If that COPC was a metal, the 95% UCL concentration was compared to the Site-specific background threshold. If the 95% UCL concentration was equal to or less than the Sitespecific background concentration threshold, the metal concentration was considered to be within background and was not further evaluated in that exposure-area-specific HHRA.

The EPCs for soil on the Building 99/100 exposure area are summarized in Table 4. Maximum COPC concentrations in soil across the Building 99/100 exposure area (that includes the vacant properties at 360, 364, and 368 Bay Boulevard) were used to estimate human health risks for the on-Site construction worker and the on-Site landscaper.

The EPCs for soil in the Building 29 exposure area and the portion of Building 29 where excavation will be conducted to construct the loading dock are summarized in Tables 5 and 6, respectively. The EPCs for the on-Site construction worker were derived using only COPCs in soil within the planned loading dock excavation area (Table 6). The EPCs for the on-Site landscaper were derived using COPCs in soil across the entire exposure area.

4.2.2.1.2. Soil Vapor
For each COPC in soil vapor, indoor air EPCs were either derived at each soil vapor sample location or using maximum concentrations beneath each building.

Building 99/100 exposure area - Buildings 99 and 100 may be used for commercial/industrial purposes or may be razed and the area redeveloped for surface parking. Both scenarios were evaluated in this HHRA using the following methods:
 Maximum detected soil vapor concentrations beneath each building assuming the buildings remain in place; and
 A point-by-point basis that allowed for estimating future vapor intrusion risks at each location with soil vapor data since future building locations in this exposure area are not known.
20 Building 29 exposure area – For Building 29, an estimated COPC concentration in indoor air was derived from its detected VOC concentration at each soil vapor sample location. The approach was conducted for Building 29 given the size of the building, as it is unlikely that vapors migrating into the building will be completely mixed as is assumed in the derivation of 95% UCL concentrations.

It was assumed that VOC concentrations in indoor air can be estimated from on-Site soil vapor data as described above. A summary of EPCs in soil vapor is provided in Table 7 (Building 99/100 exposure area) and Table 8 (Building 29 exposure area).

4.2.2.2 Derivation of EPCs
For incidental ingestion and dermal contact with soil within each exposure area, the maximum COPC concentrations or the 95% UCL within the upper 10 feet of vadose zone soil were used as the EPCs.

Ambient air EPCs from generated fugitive dust and VOCs emanating into ambient air were also derived from COPC concentrations within the upper 10 feet of vadose zone soil. Indoor air EPCs from vapor intrusion into indoor air were derived using COPC concentrations in soil vapor. The calculations used to estimate the EPCs in ambient and indoor air are described below.

4.2.2.3 Fugitive Dust in Ambient Air
COPCs that are relatively nonvolatile compounds can adhere to soil and become airborne because of wind erosion or mechanical disturbance such as soil grading operations. Once airborne, these soil particulates generate fugitive dust that can be inhaled. The fugitive dust EPC is estimated by multiplying the COPC EPC in soil by the inverse of the particulate emission factor (PEF) relevant to the fugitive dust generating activities.

During intrusive activities associated with activities conducted by the future on-Site construction worker, fugitive dust may be generated by various activities, including not only wind erosion, but also by vehicles driven on unpaved roads, trucks dumping excavated soil, dozing, grading, tilling, or similar operations, as noted in the 2002 EPA document (EPA, 2002a). To account for these activities, the PEF during these activities was assumed to be the DTSC-recommended default PEF identified for the construction scenario in the 9 April 2019 DTSC document entitled “Human Health Risk Assessment (HHRA) Note Number 1, Recommended DTSC Default Exposure Factors for Use in Risk Assessment at California Hazardous Waste Sites and Permitted Facilities” (HHRA Note 1, [DTSC, 2019a]). This PEF value is 1.0 x 106 cubic meters per kilogram (m3
/kg).

For the on-Site landscaper, fugitive dust may be generated from wind erosion of exposed surface soil.

The fugitive dust EPC was estimated by dividing the COPC EPC in vadose zone soil by the PEF calculated for wind erosion for the general geographic area containing the Site. This PEF was estimated using the following equation presented in the EPA document entitled “Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites” (EPA, 2002a) using parameters for the Los Angeles, California, area. Los Angeles is the closest weather metering station to San Diego County that measures air dispersion modeling parameters.
(Equation 1)














× 







×−×
×=
x
t
m F
U

U RPF V
C
Q PEF 3
)1(
3600
21 (Equation 2)
where:

PEF = Particulate emission factor of annual average respirable fraction (PM10) of impacted fugitive dust (m3
/kg)
PM10 = Respirable fraction, particles less than 10 micrometers (µm) in diameter Q/C = Dispersion emission component, (g/m2
/s)/(kg/m3), as Q/Csc or Q/Cvol (EPA, 2002a)
A,B,C = Constants based on air dispersion modeling for Los Angeles, California, A=11.9110, B=18.4385, C=209.7845 (EPA, 2002a)
Asite = Areal extent of exposure area contamination in acres (5.2 acres for the Building 99/100 exposure area, 9.5 acres for the Building 29 exposure area) RPF = Respirable fraction of particulate (g/m2
/h), default, 0.036 g/m2/h, (EPA, 2002a)
Um = Mean annual wind speed (meters per second [m/s]), (4.69 m/s) (EPA, 2002a) Ut = Equivalent threshold value of wind speed at 7 meters, (11.32 m/s) (EPA, 2002a) Fx = Function describing Ut/Um (unitless) derived using Cowherd et al. 1985 (0.194) (EPA, 2002a)

4.2.2.4 VOCs in Ambient Air Due to Volatilization from Soil VOCs may volatize from VOC-impacted soil into the ambient air. The ambient air concentrations from subsurface impacts were estimated using the most recent EPA and DTSC guidance (see equations below). These are the same equations used to estimate ambient air concentrations in the derivation of the May 2022 EPA Regional Screening Levels (EPA, 2022) and the “Human and Ecological Risk Office (HERO) HHRA Note Number: 3, DTSC-modified Screening Levels (DTSC-SLs)” prepared by the DTSC dated June 2020 - revised May 2022 (HHRA Note 3; DTSC, 2020b). The ambient air VOC concentration was estimated by dividing the lower of the COPC EPC in vadose zone soil and the soil saturation limit concentration for the COPC by the volatilization factor (VF) calculated using default DTSC soil properties for sand presented in the Johnson & Ettinger Model ([J&E Model]; DTSC, 2014). Our estimates were based on the total matrix concentrations in samples collected within the entire vadose zone (depths to 10 feet below ground surface). The total matrix concentration includes concentrations present in the entire soil matrix, including concentrations adhered to the soil and organic particles and within the soil’s water- and air-filled porosity.

The use of the equations conservatively assumes that VOCs volatilize directly from soil into ambient air.

The Site surface is not bare ground as assumed in these equations. Instead, there is a paved surface or building covering the majority of the entire Site which acts as a barrier that impedes the migration of VOCs from the subsurface directly into ambient air. Assuming this barrier is not present, as was done in this HHRA, overestimates actual ambient concentrations.

The soil saturation limit concentration was estimated following Equation 4-9 presented in the EPA document entitled “Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites” (EPA, 2002a):
(Equation 3)
] )(ln exp[
2 C
BA
A
C
Q site − ×=
( ) wbd a
b
K H Ssat ρ 'Θ+Θ+×=
ρ
22 where:
sat = Soil saturation concentration (mg/kg)
S = Solubility in water (milligrams per liter-water, chemical-specific) (EPA, 2022) ρb = Dry soil bulk density (grams per cubic centimeter [g/cm3], default property for sand in the J&E Model)
Kd = Soil-water partition coefficient (cubic centimeter per gram [cm3 /g]) = Koc x foc
foc = Soil organic carbon-water partition coefficient (cm3 /g, chemical-specific; EPA, 2022)
foc = Fraction organic carbon in soil (gram per gram [g/g], default, 0.006; EPA, 2002a) Θw = Water-filled soil porosity (l water/l soil, default property for sand in the J&E Model) Θa = Air-filled soil porosity (l air/l soil, default property for sand in the J&E Model) H' = Dimensionless Henry’s Law constant (chemical-specific; EPA, 2022) The soil VF for the construction scenario was calculated using the following subchronic volatilization factor equation, Equation 5-14 as specified by EPA (2002a):
(Equation 4)
where:

VF = Volatilization factor (m3
/kg)
DA = Apparent diffusivity (centimeters squared per second [cm2 /s], see Equation 5)
T = Total time over which construction occurs (s, receptor-specific, e.g., 31,536,000 s = 1 year for the future on-Site construction worker)
ρb = Dry soil bulk density (g/cm3, Site-specific, same as used in the J&E Model) Q/C = Dispersion emission component, ([g/m2
/s]/[kg/m3], see Equation 6)
FD = Dispersion correlation factor (unitless, 0.185, EPA 2002a) and where:

(Equation 5)
where:

DA = Apparent diffusivity (cm2
/s, chemical-specific)
ρb = Dry soil bulk density (g/cm3, default property for sand in the J&E Model) ΘA = Air-filled soil porosity (l air/l soil, default property for sand in the J&E Model) n = Total soil porosity (l pore/l soil, default property for sand in the J&E Model) Θw = Water-filled soil porosity (l water/l soil, default property for sand in the J&E Model)
Di = Diffusivity in air (cm2/s, chemical-specific; EPA, 2022) H' = Dimensionless Henry’s Law constant (unitless, chemical-specific; EPA, 2022) Dw = Diffusivity in water (cm2
/s, chemical-specific; EPA, 2022)
Kd = Soil-water partition coefficient (cm3
/g) = Koc x foc
[( ) ]
'
' / 10/3 10/3 2
K H
D H D n
D
b d w w
a i w w
A + Θ + Θ
Θ +Θ = ρ
23 Koc = Soil organic carbon-water partition coefficient (cm3/g, chemical-specific; EPA, 2022)
foc = Fraction organic carbon in soil (g/g, 0.006 = default; EPA, 2002a) (Equation 6)
where:

Q/C = Dispersion emission component, ([g/m2
/s]/[kg/m3]
A = Unitless constant (11.911 = default for Los Angeles for on-Site landscaper (post development receptors; 2.4538 default for future on-Site construction worker, EPA, 2002a)
Ac = Areal extent of Site soil contamination (acres, exposure area specific) B = Unitless constant (18.439 = default for Los Angeles for post development receptors; 17.566 = default for construction worker, EPA, 2002a) C = Unitless constant (209.7845 = default for Los Angeles for post development receptors; 189.0426 = default for construction worker, EPA 2002a) The soil VF for the on-Site landscaper was calculated using the following equations presented by EPA (2002a) as Equation 4-8:
(Equation 7)
where:

VF = Volatilization factor (m3
/kg)
DA = Apparent diffusivity (cm2
/s, see Equation 5)
T = Total time (s, receptor specific, e.g., 788,400,000 s = 25 years for occupational receptors)
ρb = Dry soil bulk density (g/cm3, default property for sand in the J&E Model) Q/C = Dispersion emission component, ([g/m2
/s]/[kg/m3], see Equation 6)
Each COPC concentration in ambient air was calculated using the following equation:

Ca =
VF
Cs (Equation 8)

where:

Ca = Ambient air concentration (milligram per cubic meter [mg/m3 ])
Cs = Soil concentration (mg/kg)
VF = Volatilization factor (m3
/kg, see Equation 4 above)

24 4.2.2.5 VOCs in Indoor Air Due to Subsurface Vapor Intrusion VOCs may volatize from VOC-impacted soil or groundwater and enter indoor air from upward migration of vapor through cracks and seams in the building foundation. The COPC concentrations in soil vapor samples collected beneath and adjacent to the future building footprints within each on-Site exposure area were used to calculate EPCs in indoor air at each of those soil vapor sample locations.

The building-specific vapor intrusion evaluation for Buildings 29, 99, and 100 were conducted following the guidance presented in the EPA Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway from Subsurface Vapor Sources to Indoor Air (EPA, 2015), the DTSC Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air (DTSC, 2011), and HERO Note 4 (DTSC, 2022). For each selected VOC concentration in soil vapor, the potential indoor air concentration was estimated by multiplying its detected concentration by a default attenuation factor. The EPA default attenuation factor of 0.03 was used to estimate indoor air concentrations. This attenuation factor was conservatively used instead of the DTSC recommended commercial building attenuation factors identified in Table 2 of the DTSC Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air (DTSC, 2011). The DTSC recommended commercial building attenuation factors are 0.001 for an existing building contaminant source, 0.05 for an existing building sub-slab, and 0.0005 for a future building contaminant source.

4.2.3 Estimation of Chemical Intakes
EPA risk assessment guidelines recommend that intake doses be calculated in a manner that produces risk estimates of the RME scenario (EPA, 1989). The RME considers the upper bound case described by using the 50th or 95th percentile of the actual distribution of most input parameters, including receptor characteristics used to estimate intake doses. The intent of the RME scenario is to focus the risk assessment on conservative exposures within the range of possible exposures. Since the RME scenario uses a mixture of upper bound and central tendency assumptions and data, the associated estimated COPC intake is not an average COPC intake but is intended to be an estimate of the plausible upper-end intake. These conservative assumptions add another level of conservativeness that further overestimates potential exposures. These assumptions are presented in Table 3.

The exposure values for the identified receptors are generally consistent with the HHRA Update, and were updated with more current values obtained from the:
 2019 DTSC guidance entitled “Human Health Risk Assessment (HHRA) Note Number 1, Recommended DTSC Default Exposure Factors for Use in Risk Assessment at California Hazardous Waste Sites and Permitted Facilities” (DTSC, 2019a),  2002 EPA guidance entitled “Supplemental Guidance for Developing Screening Levels for Superfund Sites” (EPA 2002a),
 2014 EPA document entitled “Human Health Evaluation Manual, Supplemental Guidance:

Update of Standard Default Exposure Factors” (EPA, 2014), and  2009 EPA document entitled “Risk Assessment Guidance for Superfund, Volume I, Human Health Evaluation Manual, Part F, Supplemental Guidance for Inhalation Risk Assessment),” (EPA, 2009).

25 4.2.3.1 Soil Ingestion and Dermal Contact with Soil
For noncarcinogenic effects, intake for soil ingestion and dermal exposure to soil is averaged over the period of exposure and referred to as the average daily intake (ADI). For carcinogenic effects, the intake is averaged over a lifetime and referred to as the lifetime average daily intake (LADI). The following general equation was applied to estimate COPC intake for soil ingestion and dermal exposure to soil exposure pathways considered in the HHRA:

Intake = C x IR x EF x ED x RAF (Equation 9)
BW x AT
where:

Intake = ADI (mg/kg-day) for noncarcinogens
LADI (mg/kg-day) for carcinogens
C = EPC of COPC in environmental medium (e.g., mg/kg for soil) IR = Intake rate (e.g., mg soil/day)
EF = Exposure frequency (days/year)
ED = Exposure duration (years)
RAF = Relative absorption factor (i.e., the ratio of bioavailability in the exposure scenario to bioavailability in the exposure situation from which the toxicity criteria are based)
BW = Body weight (kg)
AT = Averaging time (days)

4.2.3.1.1. Incidental Ingestion of Soil
The equation used to estimate COPC intake due to incidental ingestion of soil is presented below:

Intake = CS x IR x CF x EF x ED x RAF
BW x AT (Equation 10)
where:

CS = EPC of COPC in soil (mg/kg)
IR = Ingestion rate of soil (mg/day)
CF = Conversion factor (1 x 10-6 kg/mg)
EF = Exposure frequency (days/year)
ED = Exposure duration (years)
RAF = Relative absorption factor (unitless)
BW = Body weight (kg)
AT = Averaging time (days)

4.2.3.1.2. Dermal Contact with Soil
The equation used to estimate COPC intake due to dermal contact with soil is presented below:

Intake = CS x AF x SA x CF x EF1 x EF2 x ED x ABSd
BW x AT (Equation 11)
26 where:

CS = EPC of COPC in soil (mg/kg)
AF = Soil adherence factor (mg/cm2-event)
SA = Surface area of exposed skin (cm2
)
CF = Conversion factor (1 x 10-6 kg/mg)
EF1 = Exposure frequency (days/ year)
EF2 = Contact rate (event/day)
ED = Exposure duration (years)
ABSd = Dermal absorption fraction (unitless)
BW = Body weight (kg)
AT = Averaging time (days)

4.2.3.2 Inhalation Exposure
For the inhalation pathway, intake of COPCs in air is a time-weighted average concentration, referred to as the exposure concentration (EC), derived from measured or modeled concentrations in air and adjusted based on characteristics of the exposure scenario and receptor being evaluated (e.g., exposure time, exposure frequency, etc.). The following general equation was applied to estimate ECs for the inhalation exposure pathways considered in the HHRA:

EC = CA x ET x EF x ED (Equation 12)
AT
where:

EC = Exposure concentration (µg/m3
)
CA = EPC of COPC in air (µg/m3 in air, either measured or modeled) ET = Exposure time (hours/day)
EF = Exposure frequency (days/year)
ED = Exposure duration (years)
AT = Averaging time (hour over a lifetime for cancer risk, hours over exposure period for hazard index)

4.3 TOXICITY ASSESSMENT
The toxicity assessment characterizes the relationship between the magnitude of exposure to a COPC and the nature and magnitude of adverse health effects that may result from each exposure. Adverse health effects are generally classified into two broad categories: noncarcinogens and carcinogens.

Toxicity values are typically developed based on the threshold approach for noncarcinogenic effects and the non-threshold approach for carcinogenic effects. Toxicity values may be based on epidemiological studies, short-term human studies, or subchronic or chronic animal data. Toxicity values to estimate adverse noncarcinogenic health effects as hazard quotients (HQs) are derived using reference doses (RfDs) and reference concentrations (RfCs); toxicity values to estimate incremental lifetime cancer risks ([ILCRs], also typically referred to as excess lifetime cancer risks), are derived using cancer slope factors (SFs) and unit risk factors (URFs).
27 4.3.1 Adverse Noncarcinogenic Health Effects
It is widely accepted that adverse noncarcinogenic health effects from chemical substances occur only after a threshold dose or intake is reached. To establish a toxicity value for an adverse noncarcinogenic health effect, a threshold dose is usually estimated from the no-observed-adverse-effect-level (NOAEL), or the lowest-observed-adverse-effect-level (LOAEL) determined from chronic or subchronic animal studies. The NOAEL is the highest dose at which no adverse effects are observed; the LOAEL is the lowest dose at which adverse effects are observed.

Safety factors (up to 1,000-fold) are applied to the NOAEL or LOAEL observed in animal studies or human epidemiological studies to establish conservative RfDs or RfCs. An RfD is an estimate of a dose level not expected to result in adverse health effects in humans, even among the most sensitive members of the population (EPA, 1989). RfDs are expressed as acceptable daily doses in milligrams of chemical per kilogram of body weight per day (mg/kg-day) and are used to derive estimated risk from exposure to noncarcinogens via ingestion and dermal contact.

An RfC is an estimate of a continuous inhalation exposure to the human population (including sensitive subgroups) likely to be without appreciable risk of deleterious effects during a lifetime (EPA, 2009). RfCs are expressed in µg/m3 and are used to estimate risks from exposure to noncarcinogens via inhalation.

4.3.2 Carcinogenic Health Effects
Regulatory agencies have generally assumed that carcinogenic agents do not have toxicological thresholds. The dose-response curve used to regulate carcinogens only predicts zero risk when there is zero dose (i.e., for doses greater than zero, some risk is assumed to be present). Cancer risks from potential human exposures to carcinogenic chemicals are modeled mathematically using either animal or human data.

Cancer risks for exposure to carcinogens are defined in terms of upper bounds on probabilities. The probabilities identify the likelihood of a carcinogenic response in an individual who receives a given dose of a particular chemical (based on mathematical modeling of the animal or human data). Potential carcinogenic effects are expressed as the probability that an individual will develop cancer from a lifetime exposure. This probability is based on projected intakes and chemical-specific dose-response data called SFs and URFs.

The SF defines the cancer risk due to average lifetime exposure to one unit of carcinogen (in units of risk per mg/kg-day written as the inverse of mg/kg-day (mg/kg-day)-1) and is used to derive estimated risk from exposure to carcinogens via ingestion and dermal contact. To derive SFs, the EPA generally uses the linearized multistage model for low-dose extrapolation. The model is considered one of the most conservative models applied and has been recognized by EPA to overpredict ILCRs. Using this model, SFs are derived by calculating the 95% UCL on the slope of the linearized portion of the dose-response curve obtained from the multistage cancer model. Use of the 95% UCL of the slope means that there is only a 5 percent chance that the probability of a response could be greater than the estimated value of the experimental data used.

The inhalation URF (IURF) is the upper bound excess lifetime cancer risk estimated to result from continuous exposure to an agent at a concentration of 1 µg/m3 in air (EPA, 2009). IURFs are expressed in (µg/m3
)
-1 and are used to derive estimated risk from exposure to carcinogens via inhalation. 28 4.3.3 Chemical-specific Toxicity Values
Chronic toxicity values for adverse cancer and noncancer effects are conservatively used to evaluate both chronic and subchronic exposures for each COPC. Each exposure evaluated herein is considered to be chronic exposure. Toxicity criteria were selected using the methodology described in the DTSC February 25, 2019 “Human Health Risk Assessment (HHRA) Note, Human and Ecological Risk Office (HERO) HHRA Note Number: 10, Toxicity Criteria.” The selected toxicity values for the COPCs are presented in Table 9.

4.4 RISK CHARACTERIZATION
Risk characterization is the fourth step in the risk assessment process. Risk characterization includes the integration of the toxicity and exposure assessments to provide quantitative and qualitative expressions of risk.

4.4.1 Calculation of Adverse Noncarcinogenic Health Effects for Exposure to Soil – Other Than Lead The RfD and RfC are used in the risk characterization to estimate the potential for adverse noncarcinogenic health effects. The estimated ADI divided by the RfD or RfC for inhalation exposures is referred to as an HQ. An HQ value greater than 1 indicates a chemical dose above the RfD for that pathway, and thus a potential for adverse noncarcinogenic health effects. A total hazard index (HI) is a sum of the HQs for more than one chemical with similar toxicological endpoints. A total HI greater than 1 indicates a potential for an adverse noncarcinogenic health effect from exposure to that chemical or chemicals. Additional risk evaluation is typically undertaken only when this threshold is exceeded.

Additional information regarding the derivation and interpretation of HQs and total HI is presented below.

The HQ compares a receptor's exposure or intake level to the RfD or RfC of that COPC, as appropriate for the defined complete pathway (EPA, 1989). To calculate an HQ, the ADI for non-inhalation exposures or EC for inhalation exposures (e.g., upper bound intake averaged over the exposure period) for each COPC is divided by the chemical-specific RfD or RfC, respectively, as shown in the following equation:

HQpathway1 = ADI/RfD
or
EC/RfC (Equation 13)
where:

HQpathway1 = HQ of particular pathway for COPC (unitless) ADI = Average daily intake of COPC (mg/kg-day)
EC = Exposure concentration (µg/m3
)
RfD = Reference dose of COPC (mg/kg-day)
RfC = Reference concentration of COPC (µg/m3
)
When using the above equation to estimate the potential for adverse noncancer health effects, both the intake and the RfD or the exposure concentration and the RfC must refer to exposures of equivalent duration (e.g., chronic).
29 For each receptor, the HQ of each pathway for the COPC is then summed to calculate the total HQ for that COPC as shown in the following equation:

Total HQ = HQpathway1 + HQpathway2 +… + HQpathway n (Equation 14) where:

Total HQ = Summed HQs for COPC (unitless)
HQpathway1 = HQ for particular pathway for COPC (unitless) As a first-tier analysis, the HQs (e.g., for all COPCs, regardless of target organ) for each receptor can be summed as the basis for conservatively estimating a preliminary total HI for that receptor. In this case, it is assumed that each COPC acts by the same mechanism and induces the same effects (EPA, 1989).

For simultaneous exposures to a receptor by several COPCs, a total HI is calculated as the sum of the HQs for each COPC by:

Total HI = HQCOPC1
+ HQCOPC2+…+HQCOPCn (Equation 15)
where:

Total HI = Total Hazard Index
Total HQCOPC n = Sum of HQs for that COPC
If the total HI exceeds a value of 1, then acceptable target organ-specific total HIs can be calculated for the receptor based on target organs as recommended by EPA (1989). For the purpose of this HHRA, target organ-specific total HIs were not derived. Instead, the preliminary total HI was used to assess the magnitude of non-cancer health risk.

4.4.2 Calculation of Adverse Noncarcinogenic Health Effects for Lead Potential human health effects from exposure to lead are typically inferred from blood lead levels and, as such, are not amenable to the HQ/HI approach described above. Health risk from exposure to lead in soil was conservatively evaluated based on information presented in the HERO Note 3 (DTSC, 2020b).

The blood lead concentration identified as acceptable, for both children and adults, is 1 microgram per deciliter (OEHHA, 2009) and will be applied to high end (i.e., RME) exposure estimates. While the LeadSpread 9 Model (DTSC, 2020a) calculates estimated 90th, 95th, 98th and 99th percentile blood lead concentrations, OEHHA identifies the 90th percentile blood lead as a “point of departure” (e.g., remedial actions are not warranted when predicted blood lead levels are at or less than 1 microgram per deciliter). The commercial/industrial DTSC-SL derived from the LeadSpread Model is 500 mg/kg, which was used to assess potential exposures to lead at the Site.

4.4.3 Calculation of Cumulative Incremental Lifetime Cancer Risk from Exposure to Soil The cancer SF or URF is used in the risk characterization to estimate the cancer risk. The SF multiplied by the LADI or the URF for inhalation exposures multiplied by EC is referred to as an ILCR:

ILCR = LADI x SF
Or
EC x IURF (Equation 16)
30 where:

ILCR = Incremental lifetime cancer risk for COPC, also referred to as excess lifetime cancer risk (unitless)
LADI = Lifetime average daily intake of COPC (mg/kg-day) EC = Exposure concentration (µg/m3
)
SF = Slope factor of COPC (mg/kg-day) -1
IURF = Inhalation URF (µg/m3
)
-1
For each COPC identified as a potential human carcinogen, the theoretical upper bound ILCR for a particular receptor is the sum of the calculated ILCRs for each COPC.

For each receptor, the ILCR of each pathway for the COPC is then summed to calculate the ILCR for that COPC as shown in the following equation:

ILCRCOPC = ILCRpathway1 + ILCRpathway2 +…+ ILCRpathwayn (Equation 17) where:

ILCRCOPC = Summed ILCR for COPC (unitless)
ILCRpathway1 = ILCR for particular pathway for COPC (unitless) If a receptor is exposed to several carcinogens, the following equation is used to sum cancer risks:

Cumulative ILCR = ILCRCOPC1 + ILCRCOPC2 + …+ ILCRCOPCn (Equation 18) where:

Cumulative ILCR = Total risk of cancer incidence for all COPCs ILCRCOPCn
= Individual COPC ILCR

4.4.4 Calculation of Incremental Lifetime Cancer Risk and Hazard Index from Inhalation of Vapors in Indoor Air
Potential human health risks to an on-Site commercial/industrial worker that may occupy the on-Site buildings were estimated assuming inhalation of the estimated VOC concentrations in indoor air. To estimate these human health risks, commercial/industrial ambient air screening levels based on a cancer risk level of 1 x 10-6 and noncancer HQ of 1 were selected from the HERO Note 3 (DTSC, 2020b). These screening levels assume that the commercial/industrial worker would be present within a building 8 hours each day for 250 days per year for 25 years. Each estimated COPC concentration in indoor air (derived by dividing the sub-slab soil vapor concentration by the default attenuation factor of 0.03) was divided by its corresponding available cancer and/or non-cancer ambient air DTSC-SL. The ratios based on the cancer ambient air DTSC-SLs were each multiplied by their corresponding risk threshold, 1 x 10-6, and the ratios (also referred to as HQs) based on the non-cancer ambient air DTSC-SL were each multiplied by their corresponding risk threshold, 1. The resulting cumulative cancer risks were summed to estimate cumulative ILCR, and the resulting HQs were summed to estimate a total HI. For human health risks due to inhalation of indoor air that were estimated on a point-by-point basis, an ILCR and HI was presented for each soil vapor sample location. These calculations and the results are presented in Appendix C.
31 4.4.5 Acceptable Risk Thresholds
Estimates of the total HI and cumulative ILCR are compared to acceptable target levels by risk managers.

There is some variability in acceptable cumulative ILCRs established by various regulatory agencies, although the acceptable target level for HIs is generally less than or equal to 1 and most target cumulative ILCRs considered acceptable lie within the risk range of 10-6 to 10-4.

4.4.5.1 Total Noncancer Hazard Index
The HI evaluation process typically occurs in two steps. First, the HQs for all COPCs are added and compared to an acceptable target total HI. If the calculated value is greater than the acceptable target level, then only total HQs for those compounds considered to have additive adverse noncarcinogenic health effects are summed in the second step to refine the HI estimate.

An HI of less than 1 indicates that it is unlikely that adverse human health effects will occur during a lifetime in an exposed population, including sensitive subpopulations (EPA, 1989). Most environmental programs employ an HI of unity (i.e., 1) as an acceptable target for risk decisions. The most explicit directive comes from the Federal Superfund Program (EPA, 1990), which is also California/EPA policy.

This directive specifies an HI of 1 as the acceptable target for risk management decisions, as well as the acceptable target risk to be achieved in designing remedial responses. This noncancer risk threshold was used in this HHRA for each receptor as the acceptable total HI to assess whether exposure to COPCs at the Site may pose an adverse noncarcinogenic effect.

4.4.5.2 Cumulative Incremental Lifetime Cancer Risk
A total incremental lifetime risk of 10-6 and 10-4 corresponds to theoretical probability of 1 chance in 1 million to 1 chance in ten thousand, which is in addition to or excess of the background cancer risk. The conservatism of such risk increments is enhanced by the fact that risk is typically expressed as an upper bound ILCR. That is, true risk is anticipated to lie somewhere between zero and the upper bound risk estimated in the risk characterization (EPA, 1989). Potential risk estimates between 10-6 and 10-4 require risk management decisions based on Site-specific land use/exposure scenarios and may or may not require remediation or mitigation (EPA, 1990). It is generally accepted in the regulatory community that risk estimates equal to or less than 10-6 do not require remediation or mitigation measures. Risk estimates greater than 10-4 generally require remediation or mitigation to reduce potential exposures, and site remediation based on cumulative ILCRs between 10-6 and 10-4 is made on a case-by-case basis.

California Proposition 65 (1986, Safe Drinking Water and Toxic Enforcement Act of 1986, Proposition 65, Health and Safety Code Section 25249.5 et seq.) requires specific notification and warning for exposure to carcinogens above the “no significant risk level,” which is based on a 10-5 excess lifetime cancer risk.

In addition, the EPA, under the Resource Conservation and Recovery Act Corrective Action Environmental Indicators (EI) program, indicates that “For the purposes of making Current Human Exposure under Control EI determinations with respect to vapor intrusion, EPA generally recommends the use of 10-5 levels for carcinogens (incremental individual lifetime cancer risk), and a HQ of 1 for noncancer risk.” Within this range of acceptable risk values, the California/EPA and EPA typically default to an acceptable cumulative ILCR threshold of 10-5 in risk management decision making for occupational receptors (e.g., on-Site landscaper) and 10-6 in risk management decision making for residential receptors. Therefore, the cumulative ILCR threshold of 10-5 for the on-Site construction worker, the onSite landscaper, and the on-Site commercial/industrial worker was used in this HHRA as the acceptable cumulative ILCR to assess whether exposure to COPCs at the Site may pose an unacceptable cancer risk. 32 4.4.6 Summary of Risk Characterization Results
The exposure area-specific risk characterization results for each exposure area are summarized below.

A summary of the exposure-area-specific HHRA risk results is presented in Table 10. The associated risk calculations are presented in Appendices D and E. As noted previously, the vacant properties at 360, 364, and 368 Bay Boulevard are included in the Building 99/100 exposure area.

4.4.6.1 Building 99/100 Exposure Area
On-Site Construction Worker: Based on the results of the HHRA for the on-Site construction worker, the cumulative ILCR is 1 x 10-7, and the total HI is 0.3. The cumulative ILCR is less than the acceptable cumulative ILCR threshold of 1 x 10-5, and the total HI is less than the acceptable total HI of 1. The lead EPC is less than the commercial/industrial DTSC-SL of 500 mg/kg. Remediation or mitigation is therefore not necessary to protect the on-Site construction worker.

On-Site Landscaper: Based on the results of the HHRA for the on-Site landscaper, the cumulative ILCR is 2 x 10-7, and the total HI is 0.04. The cumulative ILCR is less than the acceptable cumulative ILCR threshold of 1 x 10-5, and the total HI is less than the acceptable total HI of 1. The lead EPC is less than the commercial/industrial DTSC-SL of 500 mg/kg. Remediation or mitigation is therefore not necessary to protect the on-Site landscaper.

On-Site Commercial/Industrial Worker (Building 99): Based on the results of the HHRA for the on-Site commercial/industrial worker using sub-slab soil vapor data, the ILCR is 3 x 10-7, and the total HI is 0.1.

The cumulative ILCR is less than the acceptable cumulative ILCR threshold of 1 x 10-5, and the total HI is less than the acceptable total HI of 1. Remediation or mitigation is therefore not necessary to protect the commercial/industrial worker.

On-Site Commercial/Industrial Worker (Building 100): Based on the results of the HHRA for the on-Site commercial/industrial worker using sub-slab soil vapor data, the ILCR is 3 x 10-7, and the total HI is 0.1.

The cumulative ILCR is less than the acceptable cumulative ILCR threshold of 1 x 10-5, and the total HI is less than the acceptable total HI of 1. Remediation or mitigation is therefore not necessary to protect the commercial/industrial worker.

On-Site Commercial/Industrial Worker (Future Building): Based on the results of the HHRA for the onSite commercial/industrial worker using sub-slab soil vapor data, the maximum ILCR is 3 x 10-7, and the maximum total HI is 0.1. The cumulative ILCR is less than the acceptable cumulative ILCR threshold of 1 x 10-5, and the total HI is less than the acceptable total HI of 1. Remediation or mitigation is therefore not necessary to protect the commercial/industrial worker.

4.4.6.2 Building 29 Exposure Area
On-Site Construction Worker: Based on the results of the HHRA for the on-Site construction worker, the cumulative ILCR is 1 x 10-6, and the total HI is 6. The cumulative ILCR is less than the acceptable cumulative ILCR threshold of 1 x 10-5, and the total HI is greater than the acceptable total HI of 1. The lead EPC is less than the commercial/industrial DTSC-SL of 500 mg/kg. Remediation or mitigation is therefore warranted to protect the on-Site construction worker.

TCE is driving the risk. A HBRG (see Section 6) was derived for TCE in soil to reduce estimated human health risks for the on-Site construction worker from exposure soil within the planned excavation area within the Building 29 exposure area.
33 On-Site Landscaper: Based on the results of the HHRA for the on-Site landscaper, the cumulative ILCR is 1 x 10-5, and the total HI is 1. The cumulative ILCR is equal to the acceptable cumulative ILCR threshold of 1 x 10-5, and the total HI is equal to the acceptable total HI of 1. The lead EPC is less than the commercial/industrial DTSC-SL of 320 mg/kg. Remediation or mitigation is therefore not necessary to protect the on-Site landscaper.

On-Site Commercial/Industrial Worker: Based on the results of the HHRA for the on-Site commercial/industrial worker using sub-slab soil vapor data, the maximum ILCR is 2 x 10-3, and the maximum total HI is 500. The cumulative ILCR is greater than the acceptable cumulative ILCR threshold of 1 x 10-5 and the total HI is greater than the acceptable total HI of 1. Remediation or mitigation is therefore warranted to protect the on-Site commercial/industrial worker.

Bromodichloromethane, chloroform, cis-1,2-dichloroethene (cis-1,2-DCE), PCE, and TCE are driving the risk. HBRGs (see Section 6) were derived for these COPCs in soil vapor to reduce estimated health risks for the on-Site commercial/industrial worker from exposure to inhalation of indoor air for Building 29.

The Owner will be installing a sub-slab depressurization system beneath Building 29 as a vapor intrusion mitigation measure.

4.4.7 Uncertainty Analysis
It should be noted that the above risk estimates are conservative estimates of potential health risks.

The EPA and DTSC guidance documents for risk assessment provide a systematic means for organizing, analyzing, and presenting information on the nature and magnitude of risk to public health posed by chemical exposures. Despite the advanced state of current risk assessment methodology, uncertainties and limitations are inherent in the risk assessment process. To minimize the consequences of uncertainty, regulatory guidance typically relies on the use of conservative estimates of adverse health effects in the absence of strong scientific data. Because multiple conservative assumptions are used, the overall risk characterization results are much more likely to overestimate the potential risk rather than to underestimate it.

The risk estimates presented herein are likely overestimates of risk for the following reasons:
 Use of the maximum concentrations for EPCs assumes that a person would be exposed to a maximum concentration during their entire exposure duration, which is unlikely. It is more realistic to assume that a person may be exposed to representative average concentrations.

Thus, the use of maximum concentrations overestimates risk. The assumption that each maximum concentration is co-located within the exposure area further contributes to an overestimate of risks.
 It is also assumed that COPC concentrations would remain constant over time. It is more likely that given the natural degradation processes, organic COPC concentrations would decrease over time. Thus, estimated organic COPC intakes would decrease over time, which would result in lower risk estimates than presented herein.
 Conservative assumptions regarding exposure duration were assumed in the HHRA. For instance, it was conservatively assumed that an on-Site landscaper would be at the Site for a period of 100 days a year for 25 years, when it is more realistic that the longest any one particular landscaper would be on Site is significantly less. The shorter the exposure duration the lower the estimated risks.
34  This HHRA includes assumptions about general characteristics and potential patterns of human exposure. RME exposures were calculated to provide some measure of the range and uncertainty in potential exposures. The RME case is developed to provide an upper bound on exposure. Because RME estimates are based on a combination of conservative assumptions, the estimates likely overpredict exposures that would generally be encountered. Both the EPA and DTSC publish conservative default exposure assumptions. EPA’s default soil adherence factor for the industrial worker (including a utility worker) as identified in the HHRA Note 1 is less conservative then the DTSC soil adherence factor used in this HHRA. The DTSC default industrial worker soil adherence factor is 0.2, while the EPA default adherence factor is 0.12. Using the DTSC value as assumed in this HHRA results in nearly twice the estimated risk than if the EPA default soil adherence factor were used.
 Toxicity values used in risk assessments present overestimates of the potential toxicity of these chemicals to humans. Assumptions used to develop toxicity values include the addition of safety factors to account for uncertainties associated with extrapolating high doses to low doses where chronic environmental exposures would occur and to account for uncertainties associated with the use of laboratory animal studies to assess potential toxicity to human receptors.
 The EPA default sub-slab soil vapor to indoor air attenuation factor was used to estimate indoor air concentrations. EPA based this attenuation factor on the 95th percentile of the attenuation factors derived from indoor air and sub-slab data pairs included in their vapor intrusion database, “EPA’s Vapor Intrusion Database: Evaluation and Characterization of Attenuation Factors for Chlorinated Volatile Organic Compounds and Residential Buildings.” The data pairs used were solely for chlorinated hydrocarbons in residential settings with more than 75 percent collected within basements where indoor air concentrations would likely be higher than the rest of the home, where there is typically more ventilation. Using this EPA default attenuation likely overestimates indoor air concentrations and estimated risks associated with this pathway for the commercial/industrial worker.

35 5. Development of Health-Based Remediation Goals
The HBRGs were derived based on the results of the exposure-area-specific HHRAs. Of the two exposure areas at the Site, only the Building 29 exposure area required development of heath-based remediation goals. No HBRGs were required for the Building 99/100 exposure area that includes 360, 364, and 368 Bay Boulevard, because no remediation or mitigation is necessary to protect on-Site receptors regardless of whether or not Buildings 99 and 100 remain.

Health–based remediation goals were derived for soil vapor beneath and adjacent to Building 29 and for soil within the planned loading dock excavation area in the Building 29 exposure area. The calculations presenting the derivation of the HBRGs are presented in the Appendix E.

The COPCs with EPCs that contributed the most to the risk threshold exceedances, referred to as risk drivers, were identified. HBRGs were derived for the chemical risk drivers by lowering the concentrations of these risk drivers for each of the soil vapor samples or soil samples that exceeded risk thresholds until the risk thresholds were met for the receptor. These lowered health protective EPC concentrations for soil vapor and soil, identified as the HBRGs, are listed in Table 11.

The soil vapor locations that exceed the HBRGs are highlighted on Figure 8 and identified below:
 B29-V04/PW-06  B29-V19  DGA-011
 B29-V07  PW-15  DGA-016
 PW-07  DGA-004  DGA-017
 B29-V09/PW-09  DGA-007  DGA-019
 PW-12  DGA-008  DGA-021
 B29-V16  DGA-009  DGA-022
 PW-14
Table 12 summarizes the estimated ILCR and HI for the on-Site commercial/industrial worker at each of these soil vapor locations after the HBRGs have been met.

The soil samples that exceed the HBRG are highlighted on Figure 9 and are identified below:
 B29-23; and
 B29-24.

Table 12 summarizes the estimated ILCR and HI for the on-Site construction worker after the HBRGs have been met.
36 6. Conclusions and Recommendations
Haley & Aldrich performed this HHRA for Parcel A that includes an evaluation of two exposure areas.

One exposure area, the Building 99/100 exposure area is north of G Street and includes Buildings 99/100 and three vacant properties to the north at 360, 364, and 368 Bay Boulevard. Two scenarios are considered for this exposure area: Buildings 99 and 100 remain with continued commercial/industrial use, or Buildings 99 and 100 are razed and along with the vacant properties at 360, 364 and 368 Bay Boulevard are redeveloped as surface parking. The second exposure area, the Building 29 exposure area, is south of G Street and includes Building 29. The northern portion of Building 29 will be demolished and up to approximately 5 feet of soil will be excavated to construct a loading dock adjacent to the building.

The HHRA has been performed in accordance with regulatory guidance and considers the following receptors for each exposure area: on-Site construction worker, landscaper, and commercial/industrial worker. The conclusions for each exposure area are provided below.

6.1 BUILDINGS 99/100 EXPOSURE AREA
The cumulative ILCR for each on-Site receptor for the Buildings 99/100 exposure area, regardless of whether Buildings 99 and 100 remain, is less than the acceptable cumulative ILCR threshold of 1 x 10-5 and the total HI is less than the acceptable total HI of 1. The lead EPC is less than the commercial/industrial DTSC-SL of 500 mg/kg. Based on the results of the HHRA, no remediation or mitigation is necessary to protect the on-Site receptors. Therefore, based on these results, it is requested that the SDRWQCB provide concurrence that no further action is warranted at this time and Rohr has met the requirements of the CAO for this exposure area (that includes 360, 364 and 368 Bay Boulevard).

6.2 BUILDING 29 EXPOSURE AREA
For the on-Site landscaper, the cumulative ILCR is equal to the acceptable cumulative ILCR threshold of 1 x 10-5, and the total HI is equal to the acceptable total HI of 1. The lead EPC is less than the commercial/industrial DTSC-SL of 500 mg/kg. Remediation or mitigation is therefore not necessary to protect the on-Site landscaper.

Based on sub-slab soil vapor data for the on-Site commercial/industrial worker, the cumulative ILCR is greater than the acceptable cumulative ILCR threshold of 1 x 10-5 and the total HI is greater than the acceptable total HI of 1 for the on-Site commercial/industrial worker. Bromodichloromethane, chloroform, cis-1,2-DCE, PCE, and TCE are driving the risk. HBRGs were derived for these COPCs in soil vapor to reduce estimated health risks for the on-Site commercial/industrial worker from exposure to inhalation of indoor air for Building 29. The soil vapor HBRGs for bromodichloromethane, chloroform, cis-1,2-DCE, PCE, and TCE are 70, 80, 100, 370, and 350 µg/m3 , respectively. The Owner will be installing
a SSDS beneath Building 29 as a vapor intrusion mitigation measure and implementing an RMP.

For the on-Site construction worker, the cumulative ILCR is less than the acceptable cumulative ILCR threshold of 1 x 10-5 and the lead EPC is less that the commercial/industrial DTSC-SL of 500 mg/kg.

However, the total HI is greater than the acceptable total HI of 1. Remediation or mitigation is therefore warranted to protect the on-Site construction worker. TCE is driving the risk. A HBRG was derived for TCE in soil to reduce estimated human health risks for the on-Site construction worker during excavation to construct the new loading dock on the north end of Building 29. The HBRG for TCE in this area is 1.5 mg/kg.
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28. Haley & Aldrich, Inc., 2020a. Data Gap Assessment Report, Rohr, Inc. – Rohr, Inc. - Parcel A, Building 29, 850 Lagoon Drive, Chula Vista, California, SDRWQCB Code No. SMC:20- 0283.051:alot, GeoTracker ID: T0000011095. February 18.

29. Haley & Aldrich, Inc., 2021. Revised Conceptual Site Model, Rohr, Inc. – North Campus, Parcel A, 850 Lagoon Drive, Chula Vista, California, GeoTracker ID No. T10000011095. April 30.

30. Haley & Aldrich, Inc. 2022a. Data Gap Investigation Work Plan, Rohr, Inc. – North Campus, Parcel A, Chula Vista, California, GeoTracker ID No. T10000011095. January 21.

31. Haley & Aldrich, Inc. 2022b. Revised Updated Sitewide Conceptual Site Model, Rohr, Inc. – North Campus, Parcel A, Chula Vista, California, GeoTracker ID No. T10000011095. February 25.

32. Haley & Aldrich, Inc. 2022c. Data Gap Investigation Report, Rohr, Inc. – North Campus, Parcel A, Chula Vista, California, GeoTracker ID No. T10000011095. June 10.

33. Huntley, David, 2000. Analysis of the Potential for Downward Leakage of Dissolved-Phase Chlorinated Hydrocarbons, BF Goodrich Aerospace Facility, Chula Vista, CA. January 9.

34. Partner Engineering and Science, Inc. 2020. Phase I Environmental Site Assessment Report, Bay Boulevard – Parcel A, 350, 360. 364 and 368 Bay Boulevard, Chula Vista, CA 91910. December

28. 35. URS Corporation. 2013. Phase I Environmental Site Assessment, UTAS – Chula Vista, 850 Lagoon Drive Chula Vista, California 91910. April 2.

36. URS Corporation, 2015. Supplemental Remedial Investigation Report, Rohr, Inc. – North Campus, 850 Lagoon Drive, Chula Vista, CA. May 1.

37. URS Greiner Woodward-Clyde, 1999. Report of Subsurface Investigation, BFGoodrich Aerospace Facility, Chula Vista, California. January 12.

38. U.S. Environmental Protection Agency, 1988. Superfund Exposure Assessment Manual. Office of Remedial Response. April.

39. U.S. Environmental Protection Agency, 1989. Risk Assessment Guidance for Superfund (RAGS), Vol. I, Human Health Evaluation Manual (Part A). Office of Emergency and Remedial Response.

December.

40. U.S. Environmental Protection Agency, 1990. National Oil and Hazardous Substances Pollution Contingency Plan; Final Rule. 40 CFR Part 300.

41. U.S. Environmental Protection Agency, 1991a. Risk Assessment Guidance for Superfund, Volume I: Human Health Evaluation Manual (Part B: Development of Risk-Based Preliminary Remediation Goals). Office of Emergency and Remedial Response. 40 References
(continued)

42. U.S. Environmental Protection Agency, 1991b. Risk Assessment Guidance for Superfund, Volume I: Human Health Evaluation Manual, Supplemental Guidance “Standard Default Exposure Factors.” OSWER Directive 9285.6-03. Office of Solid Waste and Emergency Response. March.

43. U.S. Environmental Protection Agency, 1991c. Office of Solid Waste and Emergency Response.

OSWER Directive 9355.0-30.

44. U.S. Environmental Protection Agency, 1992a. Dermal Exposure Assessment: Principles and Applications. Office of Health and Environmental Assessment. Washington, D.C. EPA/600/8- 91/011B. January.

45. U.S. Environmental Protection Agency, 1992b. Guidance for Data Usability in Risk Assessment (Part A), Final. Office of Emergency and Remedial Response. April.

46. U.S. Environmental Protection Agency, 1992c. Supplemental Guidance to RAGS: Calculating the Concentration Term. Publication 9285.7-08. May.

47. U.S. Environmental Protection Agency, 1992d. Guidelines for Exposure Assessment. 57FR22888- 22938.

48. U.S. Environmental Protection Agency, 1996. Soil Screening Guidance: Technical Background Document. Office of Emergency and Remedial Response. May.

49. U.S. Environmental Protection Agency, 1997. The Lognormal Distribution in Environmental Applications. Technology Support Center Issue. Office of Solid Waste and Emergency Response.

December.

50. U.S. Environmental Protection Agency, 2001. Risk Assessment Guidance for Superfund, Volume I: Human Health Evaluation Manual (Part E, Supplemental Guidance for Dermal Risk Assessment) Interim. Review Draft – For Public Comment. Office of Emergency and Remedial Response. EPA/540/R/99/005. OSWER 9285.7-02EP. September.

51. U.S. Environmental Protection Agency, 2002a. Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. Office of Solid Waste and Emergency Response. OSWER 9355.4-24. December.

52. U.S. Environmental Protection Agency, 2002b. Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. OSWER 9285.6-10. Office of Emergency and Remedial Response. December.

53. U.S. Environmental Protection Agency, 2009. Risk Assessment Guidance for Superfund, Volume I, Human Health Evaluation Manual (Part F, Supplemental Guidance for Inhalation Risk Assessment), OSWER 9285.7-82, Office of Superfund Remediation and Technology Innovation.

January.

41 References
(continued)

54. U.S. Environmental Protection Agency, 2014. Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER Directive 9200.1-120.

February 6.

55. U.S. Environmental Protection Agency, 2015. OSWER Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway from Subsurface Vapor Sources to Indoor Air. June.

56. U.S. Environmental Protection Agency, 2022. Regional Screening Levels. May.

57. Woodward-Clyde Consultants. 1998. “Data Compilation and Evaluation Report, Rohr, Inc., Chula Vista, California.” May 27.

G:\127827_North Campus\019_Parcel A HHRA and Soil RAP\Deliverables\HHRA\2022_07_Submittal\2022_0708_Parcel A_HHRA_F.docx TABLES
TABLE 1

LIST OF CHEMICALS OF POTENTIAL CONCERN
ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

CHEMICAL CAS NO. SOIL SOIL VAPOR
Arsenic 7440‐38‐2X
Barium 7440‐39‐3X
Beryllium 7440‐41‐7X
Copper 7440‐50‐8X
Lead 7439‐92‐1X
Zinc 7440‐66‐6X
Aroclor‐1242 (PCB‐1242) 53469‐21‐9X
Aroclor‐1254 (PCB‐1254) 11097‐69‐1X
Aroclor‐1260 (PCB‐1260) 11096‐82‐5X
4,4'‐DDD 72‐54‐8X
4,4'‐DDE 72‐55‐9X
4,4'‐DDT 50‐29‐3X
Chlordane 12789‐03‐6X
Heptachlor epoxide 1024‐57‐3X
Acenaphthene 83‐32‐9X
Acenaphthylene 208‐96‐8X
Anthracene 120‐12‐7X
Benzo(a)anthracene 56‐55‐3X
Benzo(a)pyrene 50‐32‐8X
Benzo(b)fluoranthene 205‐99‐2X
Benzo(g,h,i)perylene 191‐24‐2X
Benzo(k)fluoranthene 207‐08‐9X
Chrysene 218‐01‐9X
Dibenz(a,h)anthracene 53‐70‐3X
Dimethyl phthalate 131‐11‐3X
Fluoranthene 206‐44‐0X
Fluorene 86‐73‐7X
Indeno(1,2,3‐cd)pyrene 193‐39‐5X
Phenanthrene 85‐01‐8X
Pyrene 129‐00‐0X
1,1,1‐Trichloroethane 71‐55‐6X X
1,1,2‐Trichlorotrifluoroethane (F113) 76‐13‐1X
1,1‐Dichloroethane 75‐34‐3X
1,1‐Dichloroethene 75‐35‐4X
1,1‐Difluoroethane 75‐37‐6X
1,2,3‐Trimethylbenzene 526‐73‐8X
1,2,4‐Trimethylbenzene 95‐63‐6X X
1,3,5‐Trimethylbenzene 108‐67‐8X X
2‐Butanone (Methyl Ethyl Ketone) 78‐93‐3X
2,2,4‐Trimethylpentane 540‐84‐1X
4‐Ethyltoluene 622‐96‐8X
4‐Isopropyltoluene 99‐87‐6X
Acetone 67‐64‐1X X

POLYCHLORINATED BIPHENYLS
METALS

SEMIVOLATILE ORGANIC COMPOUNDS

VOLATILE ORGANIC COMPOUNDS

PESTICIDES
HALEY & ALDRICH, INC.
2021_0504_HAI_T01_COPCs.xls JULY 2022
TABLE 1

LIST OF CHEMICALS OF POTENTIAL CONCERN
ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

CHEMICAL CAS NO. SOIL SOIL VAPOR
Benzene 71‐43‐2X X
Benzyl chloride 100‐44‐7X
Bromodichloromethane 75‐27‐4X
Chloroform (Trichloromethane) 67‐66‐3X X
cis‐1,2‐Dichloroethene 156‐59‐2X X
Cyclohexane 110‐82‐7X
Cymene (p‐Isopropyltoluene) 99‐87‐6X
Dibromochloromethane 124‐48‐1X
Dichlorodifluoromethane (R12) 75‐71‐8X
Ethylbenzene 100‐41‐4X
Heptane 142‐82‐5X
Isobutane 75‐28‐5X
Isopropylbenzene 98‐82‐8X
Methyl Tert Butyl Ether 1634‐04‐4X
Methylene chloride 75‐09‐2X
m,p‐Xylenes 179601‐23‐1X X
Naphthalene 91‐20‐3X X
n‐Butylbenzene 104‐51‐8X
n‐Hexane 110‐54‐3X
n‐Propylbenzene 103‐65‐1X
o‐Xylene 95‐47‐6X
Propylene 115‐07‐1X
sec‐Butylbenzene 135‐98‐8X
Styrene 100‐42‐5X
Tetrachloroethene 127‐18‐4X X
Toluene 108‐88‐3X
trans‐1,2‐Dichloroethene 156‐60‐5X X
Trichloroethene 79‐01‐6X X
Trichlorofluoromethane (F11) 75‐69‐4X
Vinyl chloride 75‐01‐4X

VOLATILE ORGANIC COMPOUNDS
HALEY & ALDRICH, INC.
2021_0504_HAI_T01_COPCs.xls JULY 2022
TABLE 2
SUMMARY OF BACKGROUND METALS CONCENTRATIONS  ‐ SOIL
ROHR INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

Metals Minimum Geometric Arithmetic Maximum Minimum Geometric Arithmetic Maximum Minimum Geometric Arithmetic Maximum Minimum Geometric Arithmetic Maximum Minimum Geometric Arithmetic Maximum Minimum Geometric Arithmetic Maximum Mean Mean Mean Mean Mean Mean Mean Mean Mean Mean Mean Mean Antimony (Sb) < 1 0.47 0.62 2.6 0.15 0.50 0.60 1.95  ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐  0.12  ‐‐‐   ‐‐‐  1.90 1.95 7.84 Arsenic (As) < 0.10 5.5 7.0 97 0.6 2.8 3.5 11.0 1.4 6.2 7.8 20.3 2.0  ‐‐‐  4.6 9.9 9.9  ‐‐‐  16.4 31.2 1.8  ‐‐‐   ‐‐‐  15.2 31.2 8 Barium (Ba) 70 580 670 5,000 133 468 509 1,400 1.46 424 463 974 151  ‐‐‐  660 911 288  ‐‐‐  541 692 23  ‐‐‐   ‐‐‐  560 1,400 152 Beryllium (Be) < 1 0.68 0.97 15 0.25 1.14 1.28 2.70  ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐  < 0.1  ‐‐‐   ‐‐‐  1.2 2.7 0.543 Cadmium (Cd)  ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐  0.05 0.26 0.36 1.70 0.04 0.15 0.19 1.29 0.07  ‐‐‐  0.19 0.42 0.04  ‐‐‐  0.20 0.39 0.05  ‐‐‐   ‐‐‐  1.45 1.7 5.29 Chromium (Cr) 3 41 56 2,000 23 76 122 1,579 23 76 122 1,579 4  ‐‐‐  16 113 11  ‐‐‐  24 39 5.8  ‐‐‐   ‐‐‐  32.6 1,579 38 Chromium (Hexavalent) ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 5.7 Cobalt (Co) < 3 7.1 9.0 50 2.7 12.6 14.9 46.9 2.7 12.6 14.8 46.9 1.9  ‐‐‐  5.0 8.7 ND  ‐‐‐  9.0 16.9 1.6  ‐‐‐   ‐‐‐  23.2 46.9 47.2 Copper (Cu) 2 21 27 300 9.1 24.0 28.7 96.4 9.9 33 42 164.6 6.0  ‐‐‐  14 258 13.1  ‐‐‐  24 35.4 3.8  ‐‐‐   ‐‐‐  54.0 258 20 Lead (Pb) < 10 17 20 700 12.4 21.7 23.9 97.1 8.5 13.8 14.5 28.7 7.2  ‐‐‐  17.3 54.5 10.4  ‐‐‐  16.9 20.9 2.5  ‐‐‐   ‐‐‐  189.4 189.4 15 Mercury (Hg) < 0.01 0.046 0.065 4.6 0.10 0.20 0.26 0.90  ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐  0.10  ‐‐‐   ‐‐‐  0.60 0.9 0.25 Molybdenum (Mo) < 3 0.85 1.1 7 0.1 0.9 1.3 9.6  ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐  0.15  ‐‐‐   ‐‐‐  1.40 9.60 2.76 Nickel (Ni) < 5 15 19 700 9 36 57 509 9 36 57 509 5.4  ‐‐‐  11 17.3 9.9  ‐‐‐  18 25.1 3.5  ‐‐‐   ‐‐‐  28.2 509 83 Selenium (Se) < 0.1 0.23 0.34 4.3 0.015 0.028 0.058 0.43 < 0.1 0.26 0.36 1.30  ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐  1.3 7.67 Silver (Ag)  ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐  0.10 0.41 0.80 8.30  ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐  0.07  ‐‐‐   ‐‐‐  0.75 8.3 10 Thallium (Th) 2.4 9.1 9.8 31 5.3 13.8 15.7 36.2  ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐   ‐‐‐  0.05  ‐‐‐   ‐‐‐  35.0 36.2 2.2 Vanadium (V) 7 70 88 500 39 101 112 288 39 102 112 288 45  ‐‐‐  78 188 40  ‐‐‐  68 98 18  ‐‐‐   ‐‐‐  84.8 288 74.4 Zinc (Zn) 10 55 65 2,100 88 145 149 236 13 123 139 354 ND  ‐‐‐  30 66 21  ‐‐‐  45 109 10.3  ‐‐‐   ‐‐‐  247 354 38 NOTES:

Concentrations in units of milligrams per kilogram (mg/kg) ‐‐‐ = Not EvaluatedNA = Not applicableBackground Sources:USGS 1984: Element Concentrations in Soils and Other Surficial Materials of the Conterminous United States, U.S. Geological Survey Professional Paper 1270 by H.T. Shackette and J. G. Boerngen (Western U.S. Data) Kearney Foundation 1996: Background Concentrations of Trace and Major Elements in California Soils, Kearney Foundation of Soil Science, Division of Agriculture and Natural Resources, University of California Cal‐EPA 1991: Background Levels of Trace Elements in Southern California Soils, Draft Annual Report, California Environmental Protection Agency, Contract No. 89‐T0081 by University of California, Riverside, California, April 1991 Bradford, G.R., R.J. Arkley, P.F. Pratt, and F.L. Blair. 1967. Total Content of Nine Mineral Elements in Fifty Selected Benchmark Soils Profiles of California. Hilgardia 38:541‐556.

Cal‐EPA 1992: Background Levels of Trace Elements in Southern California Soils, Draft Annual Report, California Environmental Protection Agency, Contract No. 89‐T0081 by University of California, Riverside, California, June 1992 Source: USGS 1984
Western U.S.

Source: Kearney Foundation 1996
California (50 Agricultural Soils Throughout California) Maximum
Reported
Southern California (69 Pristine Desert Soils
and Sediments from the San Gorgonio Pass
Area)
Southern California (69 Pristine Desert Soils and
Sediments from the Maniobra Valley Area)
Southern California (23 Agricultural and Urban Sites in the Eastern and Southern Los Angeles Area)
from Bradford et al., 1967 (50 Agricultural Soils
Throughout California)
Background
Concentration in
California
Cal‐EPA 1991 Source: Cal‐EPA 1991 Source: Cal‐EPA 1991 Source: Cal‐EPA 1992Source:

Site SpecificBackground
Metals
Concentration
HALEY & ALDRICH, INC.
2022_0608_HAI_T02_metals_BG_comparison.xls
JULY 2022
TABLE 3 Page 1 of 4

RECEPTOR EXPOSURE ASSUMPTIONS
ROHR INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA
HALEY & ALDRICH, INC.                                                                                                                         JULY 2022 2022_0608_HAI_T03_Exposure Factors.doc
RECEPTOR:  FUTURE ON‐SITE CONSTRUCTION WORKER
Potentially Complete Pathways:
 Incidental ingestion of vadose zone soil
 Dermal contact with vadose zone soil
 Inhalation of fugitive dust generated from windborne vadose zone soil  Inhalation of vapors emanating into ambient air from vadose zone soil

PARAMETER REASONABLE MAXIMUM EXPOSURE (RME)
General Parameters:

Body Weight (BW) Value:  80 kg
Rationale:  Default value; DTSC, 2019
Exposure Frequency (EF) Value:  8 hrs./day, 250 days/year Rationale:  Default value; DTSC, 2019
Exposure Duration (ED) Value:  1 year
Rationale:  Default value; DTSC, 2019
Averaging Time (AT) Value:

Carcinogenic Effects:  70 years (25,550 days)
Noncarcinogenic Effects:  AT = Exposure duration
Rationale:  Default value; DTSC, 2019; EPA 1997, 2002, 2014 Inhalation of Particulates/VOCs:

Exposure Time (ET) Value:  8 hours/day
Rationale: Default value; DTSC, 2019; EPA, 2014
Dermal Contact with Soil:

Soil Adherence Factor (AF) Value:  0.8 mg/cm2
Rationale:  Default value; DTSC, 2019
Event Frequency (EV) Value:  1 event/day
Rationale:  EPA, 2004
Skin Surface Area (SA) Value:  3,527 cm2
Rationale:  Weighted average of mean values for head, hands, and forearms (male and female, 21+years); EPA, 2014
TABLE 3 Page 2 of 4

RECEPTOR EXPOSURE ASSUMPTIONS
ROHR INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA
HALEY & ALDRICH, INC.                                                                                                                         JULY 2022 2022_0608_HAI_T03_Exposure Factors.doc

PARAMETER REASONABLE MAXIMUM EXPOSURE (RME)
Dermal Absorption Fraction (ABSd) Value:

Chemical‐specific:  0.15 for PAHs; 0.15 for PCBs; 0 for VOCs; 0.1 for other organics; 0.03 for As; 0.001 for Cd; 0.01 for other metals; 0.05 for pesticides.

Rationale:  Default values; DTSC, 2015, 2019
Incidental Soil Ingestion:

Ingestion Rate (IRsoil) Value:  330 mg/day
Rationale:  Default value; DTSC, 2019
Relative Absorption Factor (RAF) Value:  1.0
Rationale: Assumed total dose is absorbed
RECEPTOR:  FUTURE ON‐SITE LANDSCAPER (INCLUDING UTILITY WORKER) Potentially Complete Pathways:
 Incidental ingestion of vadose zone soil
 Dermal contact with vadose zone soil
 Inhalation of fugitive dust generated from windborne vadose zone soil  Inhalation of vapors emanating into ambient air from vadose zone soil

PARAMETER REASONABLE MAXIMUM EXPOSURE (RME)
General Parameters:

Body Weight (BW) Value:  80 kg
Rationale:  Default value; DTSC, 2019
Exposure Frequency (EF) Value:  8 hrs./day, 100 days/year (2 days per week for 50 weeks) Rationale:  Reasonable assumption for landscapers in southern California Exposure Duration (ED) Value:  25 years
Rationale:  Default value; DTSC, 2019; EPA, 1997, 2002, 2004, 2014 Averaging Time (AT) Value:

Carcinogenic Effects:  70 years (25,550 days)
Noncarcinogenic Effects:  AT = Exposure duration
Rationale:  Default value; DTSC, 2019; EPA 1997, 2002, 2014 Inhalation of Particulates/VOCs:

Exposure Time (ET) Value:  8 hours/day
Rationale: Default value; DTSC, 2019; EPA, 2014
TABLE 3 Page 3 of 4

RECEPTOR EXPOSURE ASSUMPTIONS
ROHR INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA
HALEY & ALDRICH, INC.                                                                                                                         JULY 2022 2022_0608_HAI_T03_Exposure Factors.doc

PARAMETER REASONABLE MAXIMUM EXPOSURE (RME)
Dermal Contact with Soil:

Soil Adherence Factor (AF) Value:  0.2 mg/cm2   *
Rationale:  Default value; DTSC, 2019; EPA, 2004, 2011, 2014 Event Frequency (EV) Value:  1 event/day
Rationale:  EPA, 2004
Skin Surface Area (SA) Value:  3,527 cm2
Rationale:  Weighted average of mean values for head, hands, and forearms (male and female, 21+years); EPA, 2014
Dermal Absorption Fraction (ABSd) Value:

Chemical‐specific:  0.15 for PAHs; 0.15 for PCBs; 0 for VOCs; 0.1 for other organics; 0.03 for As; 0.001 for Cd; 0.01 for other metals; 0.05 for pesticides.

Rationale:  Default values; DTSC, 2015, 2019
Incidental Soil Ingestion:

Ingestion Rate (IRsoil) Value:  100 mg/day
Rationale:  Recommended screening‐level value for outdoor workers during landscaping or other soil disturbing activities; EPA, 2002, 2004; DTSC, 2019 Relative Absorption Factor (RAF) Value:  1.0
Rationale: Assumed total dose is absorbed
*  The 0.2 mg/cm2 soil adherence factor used for the landscaper (including utility worker) is identified in the DTSC Note 1, “2019 DTSC HHRA Note 1, “Recommended DTSC Default Exposure Factors for Use in Risk Assessments at California Hazardous Waste Sites and Permitted Facilities” for an industrial scenario.  Additional background regarding this value is provided by the EPA in their July 2004 “Risk Assessment Guidance for Superfund Volume I: Human Health Evaluation Manual (Part E, Supplemental Guidance for Dermal Risk Assessment)” where they indicate on page 3‐17 that “Given that there were data available for a wide variety of activities that a  commercial/industrial adult worker may engage in, a high‐end soil contact activity was selected and the central tendency weighted AF (50th percentile) derived for that activity. In so doing, the recommended weighted AF for a commercial/industrial adult worker is 0.2 mg/cm2 and is based on the 50th percentile weighted AF for utility workers (the activity determined to represent a high‐end contact activity).

The bases for this recommendation are as follows: (1) although no single activity would be representative of activities a commercial/industrial adult worker engages in, a comparison of the utility worker 50th percentile weighted AF with other commercial/industrial‐type activities (Exhibit 3‐3) shows that the utility worker represents a high‐end soil contact activity (i.e., grounds keepers, landscaper/rockery, irrigation installers, gardeners, construction workers); (2) a combination of common sense and data on the weighted AFs supports the assumption that utility worker activities represent a high‐end soil contact activity, whereas, determining which of other measured activities might represent a reasonable, central tendency (i.e., typical) soil contact activity would be difficult; and (3) selecting the central tendency weighted AF (i.e., 50th percentile) of a high‐end soil contact activity is consistent with a RME for contact rates.” It should also be noted that the February 2014 EPA Memorandum, “Human Health Evaluation Manual, Supplemental Guidance:

Update of Standard Default Exposure Factors”, the EPA indicates that the previous default soil adherence factor for an outdoor worker is 0.2 mg/cm2 but the updated default soil adherence factor of an outdoor worker is 0.12 mg/cm2 .  The updated soil adherence factor is reportedly based on the arithmetic mean of weighted average body part‐specific mean adherence factors of hands, forearms, and face for adult commercial/industrial activities.  The updated factor is lower than the factor proposed for this HHRA.  Therefore, based on the above information, the soil adherence factor of 0.2 mg/cm2 appears to be adequately conservative for the on‐Site landscaper (including utility worker) for this HHRA.

TABLE 3 Page 4 of 4

RECEPTOR EXPOSURE ASSUMPTIONS
ROHR INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA
HALEY & ALDRICH, INC.                                                                                                                         JULY 2022 2022_0608_HAI_T03_Exposure Factors.doc
RECEPTOR:  FUTURE ON‐SITE COMMERCIAL/INDUSTRIAL WORKER
Potentially Complete Pathways:
 Inhalation of vapors emanating into indoor air from vadose zone soil and groundwater

PARAMETER REASONABLE MAXIMUM EXPOSURE (RME)
General Parameters:

Exposure Frequency (EF) Value:  250 days/yr (5 days per week for 50 weeks) Rationale:  Default value; DTSC, 2019; EPA 1997, 2002, 2014 Exposure Duration (ED) Value:  25 years
Rationale:  Default value; DTSC 2019; EPA 1997, 2002, 2004, 2014 Averaging Time (AT) Value:

Carcinogenic Effects:  70 years (25,550 days)
Noncarcinogenic Effects:  AT = Exposure duration
Rationale:  Default value; DTSC 2019; EPA 1997, 2002, 2014 Inhalation of VOCs:

Exposure Time: Value:  8 hours/day
Rationale: Default value; DTSC, 2019; EPA, 2014
REFERENCES:

1. DTSC, 2015.  Preliminary Endangerment Assessment Guidance Manual.  October.

2. DTSC, 2019.  Human Health Risk Assessment (HHRA) Note Number 1, Recommended DTSC Default Exposure Factors for Use in Risk Assessment at California Hazardous Waste Sites and Permitted Facilities.  9 April.

3. EPA, 1997.  Exposure Factors Handbook, Volumes I through III.  Office of Research and Development.  EPA/600/D‐ 95/002Fa through Fc.  August.

4. EPA, 2002.  Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites.  Office of Solid Waste and Emergency Response.  OSWER 9355.4‐24.  December.

5. EPA, 2004.  Risk Assessment Guidance for Superfund, Volume I:  Human Health Evaluation Manual (Part E, Supplemental Guidance for Dermal Risk Assessment), Office of Emergency and Remedial Response.  July.

6. EPA, 2011.  Exposure Factors Handbook: 2011 Edition, EPA/600/R‐090/052F, September.

7. EPA, 2014.  Human Health Evaluation Manual, Supplemental Guidance:  Update of Standard Default Exposure Factors.  OSWER Directive 9200.1‐120.  6 February.

TABLE 4
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SOIL, BUILDING 99/100 EXPOSURE AREA ROHR INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

CASRN Chemical Name Frequency of Detection Range of Method Detection Limits for Non‐Detects Range of Reporting Limits for Non‐Detects Range of Detected Concentrations Location Depth Metals Background Concentration 95%UCL EPC Basis Inorganic Compounds (mg/kg)
7440‐36‐0 Antimony 2 / 24 0.142 : 0.157 0.714 : 0.789 0.276 ‐ 0.43 BB‐20 2.5 ‐ 3 (ft) 7.84 ‐‐ ‐‐ Within Background 7440‐38‐2 Arsenic 24 / 24 ‐ ‐‐ ‐ 0.661 ‐ 6.75 BB‐19 0.5 ‐ 1 (ft) 8 ‐‐ ‐‐ Within Background 7440‐39‐3 Barium 24 / 24 ‐ ‐‐ ‐ 54 ‐ 394 B99‐02 3.5 ‐ 4 (ft) 152 ‐‐ 394 MAX 7440‐41‐7 Beryllium 24 / 24 ‐ ‐‐ ‐ 0.225 ‐ 1.38 BB‐21 0.5 ‐ 1 (ft) 0.543 ‐‐ 1.38 MAX 7440‐43‐9 Cadmium 24 / 24 ‐ ‐‐ ‐ 0.298 ‐ 1.35 BB‐21 0.5 ‐ 1 (ft) 5.29 ‐‐ ‐‐ Within Background 7440‐47‐3 Chromium 24 / 24 ‐ ‐‐ ‐ 9.67 ‐ 22.2 B99‐04 2.5 ‐ 3 (ft) 38 ‐‐ ‐‐ Within Background 7440‐48‐4 Cobalt 24 / 24 ‐ ‐‐ ‐ 3.74 ‐ 15 B99‐02 3.5 ‐ 4 (ft) 47.2 ‐‐ ‐‐ Within Background 7440‐50‐8 Copper 24 / 24 ‐ ‐‐ ‐ 3.88 ‐ 28.8 BB‐23 0.5 ‐ 1 (ft) 20 ‐‐ 28.8 MAX 7439‐92‐1 Lead 24 / 24 ‐ ‐‐ ‐ 2.7 ‐ 42.6 BB‐23 0.5 ‐ 1 (ft) 15 ‐‐ 42.6 MAX 7439‐97‐6 Mercury 19 / 24 0.00559 : 0.00597 0.0794 : 0.0847 0.007 ‐ 0.106 BB‐23 0.5 ‐ 1 (ft) 0.25 ‐‐ ‐‐ Within Background 7439‐98‐7 Molybdenum 11 / 24 0.126 : 0.139 0.238 : 0.263 0.147 ‐ 1.04 BB‐21 0.5 ‐ 1 (ft) 2.76 ‐‐ ‐‐ Within Background 7440‐02‐0 Nickel 24 / 24 ‐ ‐‐ ‐ 4.75 ‐ 13.3 B99‐04 0.5 ‐ 1 (ft) 83 ‐‐ ‐‐ Within Background 7782‐49‐2 Selenium 8 / 24 0.285 : 0.315 0.714 : 0.789 0.368 ‐ 1.16 BB‐19 0.5 ‐ 1 (ft) 7.67 ‐‐ ‐‐ Within Background 7440‐22‐4 Silver 1 / 24 0.0816 : 0.0902 0.238 : 0.263 0.185 ‐ 0.185 BB‐18 0.5 ‐ 1 (ft) 10 ‐‐ ‐‐ Within Background 7440‐28‐0 Thallium 9 / 24 0.144 : 0.16 0.714 : 0.789 0.156 ‐ 0.929 BB‐21 0.5 ‐ 1 (ft) 2.2 ‐‐ ‐‐ Within Background 7440‐62‐2 Vanadium 24 / 24 ‐ ‐‐ ‐ 23.9 ‐ 67.8 B99‐02 3.5 ‐ 4 (ft) 74.4 ‐‐ ‐‐ Within Background 7440‐66‐6 Zinc 24 / 24 ‐ ‐‐ ‐ 24.8 ‐ 78.3 BB‐23 0.5 ‐ 1 (ft) 38 ‐‐ 78.3 MAX PCBs (mg/kg)
11097‐69‐1 Aroclor‐1254 (PCB‐1254) 1 / 24 0.031 : 0.032 0.05 : 0.05 0.12 ‐ 0.12 BB‐17 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.12 MAX 11096‐82‐5 Aroclor‐1260 (PCB‐1260) 1 / 24 0.03 : 0.031 0.05 : 0.05 0.033 ‐ 0.033 BB‐21 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.033 MAX TPCB Total PCBs 2 / 24 0.021 : 0.043 0.05 : 0.05 0.033 ‐ 0.12 BB‐17 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.12 MAX Pesticides (mg/kg)
72‐54‐8 4,4'‐DDD 3 / 8 0.0024 : 0.012 0.005 : 0.025 0.0031 ‐ 0.031 B99‐04 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.031 MAX 72‐55‐9 4,4'‐DDE 7 / 8 0.0022 : 0.0022 0.005 : 0.005 0.0024 ‐ 1 BB‐23 0.5 ‐ 1 (ft) ‐‐ ‐‐ 1 MAX 50‐29‐3 4,4'‐DDT 7 / 8 0.0022 : 0.0022 0.005 : 0.005 0.0027 ‐ 0.23 BB‐23 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.23 MAX 57‐74‐9 Chlordane 2 / 8 0.026 : 0.13 0.05 : 0.25 0.03 ‐ 0.033 BB‐19 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.033 MAX 1024‐57‐3 Heptachlor epoxide 1 / 8 0.0037 : 0.0037 0.0099 : 0.01 0.022 ‐ 0.022 B99‐01 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.022 MAX HALEY & ALDRICH, INC.
2022_0608_HAI_T04_MinMax_SO_B99.xlsx
JULY 2022
TABLE 4
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SOIL, BUILDING 99/100 EXPOSURE AREA ROHR INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

CASRN Chemical Name Frequency of Detection Range of Method Detection Limits for Non‐Detects Range of Reporting Limits for Non‐Detects Range of Detected Concentrations Location Depth Metals Background Concentration 95%UCL EPC Basis Semi‐Volatile Organic Compounds (mg/kg)
83‐32‐9 Acenaphthene 1 / 7 0.004 : 0.0041 0.015 : 0.015 0.0061 ‐ 0.0061 BB‐22 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.0061 MAX 208‐96‐8 Acenaphthylene 1 / 7 0.0042 : 0.0042 0.03 : 0.03 0.011 ‐ 0.011 BB‐23 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.011 MAX 120‐12‐7 Anthracene 1 / 7 0.002 : 0.002 0.0099 : 0.01 0.0082 ‐ 0.0082 BB‐18 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.0082 MAX 56‐55‐3 Benzo(a)anthracene 4 / 7 0.0025 : 0.0025 0.01 : 0.01 0.0031 ‐ 0.0092 BB‐20 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.0092 MAX 50‐32‐8 Benzo(a)pyrene 4 / 7 0.002 : 0.002 0.01 : 0.01 0.0029 ‐ 0.019 BB‐18 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.019 MAX 205‐99‐2 Benzo(b)fluoranthene 4 / 7 0.0021 : 0.0021 0.01 : 0.01 0.0054 ‐ 0.021 BB‐18 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.021 MAX 191‐24‐2 Benzo(g,h,i)perylene 4 / 7 0.0018 : 0.0018 0.01 : 0.01 0.0035 ‐ 0.028 BB‐18 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.028 MAX 207‐08‐9 Benzo(k)fluoranthene 3 / 7 0.0017 : 0.0017 0.01 : 0.01 0.0085 ‐ 0.047 BB‐18 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.047 MAX 218‐01‐9 Chrysene 3 / 7 0.0021 : 0.0021 0.01 : 0.01 0.0067 ‐ 0.02 BB‐18 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.02 MAX 53‐70‐3 Dibenz(a,h)anthracene 1 / 7 0.0029 : 0.003 0.0099 : 0.01 0.06 ‐ 0.06 BB‐18 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.06 MAX 206‐44‐0 Fluoranthene 3 / 7 0.0021 : 0.0021 0.01 : 0.01 0.021 ‐ 0.054 BB‐18 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.054 MAX 86‐73‐7 Fluorene 1 / 7 0.0017 : 0.0017 0.0099 : 0.01 0.0038 ‐ 0.0038 BB‐22 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.0038 MAX 193‐39‐5 Indeno(1,2,3‐cd)pyrene 3 / 7 0.0022 : 0.0022 0.01 : 0.01 0.0046 ‐ 0.11 BB‐18 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.11 MAX 85‐01‐8 Phenanthrene 3 / 7 0.0021 : 0.0021 0.01 : 0.01 0.0062 ‐ 0.023 BB‐18 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.023 MAX 129‐00‐0 Pyrene 4 / 7 0.0029 : 0.0029 0.01 : 0.01 0.0072 ‐ 0.058 BB‐20 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.058 MAX Volatile Organic Compounds (mg/kg)
78‐93‐32‐Butanone (Methyl Ethyl Ketone) 1 / 24 0.0037 : 0.0039 0.049 : 0.052 0.022 ‐ 0.022 BB‐21 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.022 MAX 67‐64‐1 Acetone 1 / 24 0.0061 : 0.0065 0.12 : 0.13 0.076 ‐ 0.076 BB‐21 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.076 MAX 99‐87‐6 Cymene (p‐Isopropyltoluene) 3 / 24 0.00062 : 0.00066 0.0049 : 0.0052 0.00073 ‐ 0.029 BB‐21 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.029 MAX 179601‐23‐1 m,p‐Xylenes 1 / 24 0.00026 : 0.00028 0.0049 : 0.0052 0.00076 ‐ 0.00076 B99‐02 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.00076 MAX Notes and Abbreviations:
mg/kg = milligrams per kilogram.

HALEY & ALDRICH, INC.
2022_0608_HAI_T04_MinMax_SO_B99.xlsx
JULY 2022
TABLE 5
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SOIL, BUILDING 29 EXPOSURE AREA ROGH INC. ‐  PARCEL A

CHULA VISTA, CALIFORNIA

Metals (mg/kg)
7440‐36‐0 Antimony 6 / 46 0.143 : 4.51 0.718 : 10.2 0.208 ‐ 1.18 B29‐05 1.5 ‐ 2 (ft) 7.84 ‐‐ ‐‐ Within Background 7440‐38‐2 Arsenic 54 / 60 0.248 : 1.13 0.718 : 3.06 1.1 ‐ 24.6 B29‐07A 0.5 ‐ 1 (ft) 8 8.56 8.56 95%UCL 7440‐39‐3 Barium 46 / 46 0.148 : 2.71 0.478 : 3.06 18.4 ‐ 371 B29‐03 2.5 ‐ 3 (ft) 152 ‐‐ 371 MAX 7440‐41‐7 Beryllium 40 / 46 0.112 : 0.143 0.239 : 0.54 0.152 ‐ 0.627 B29‐17 2.5 ‐ 3 (ft) 0.543 0.367 ‐‐ Within Background 7440‐43‐9 Cadmium 42 / 46 0.11 : 0.142 0.45 : 0.54 0.158 ‐ 0.96 PW‐07 1.5 ‐ 1.5 (ft) 5.29 ‐‐ ‐‐ Within Background 7440‐47‐3 Chromium 46 / 46 0.136 : 0.709 0.239 : 1.1 5.09 ‐ 18.7 NCW‐021B 5 (ft) 38 ‐‐ ‐‐ Within Background 7440‐48‐4 Cobalt 46 / 46 0.142 : 0.556 0.239 : 1.02 2.71 ‐ 18 B29‐15 0.5 ‐ 1 (ft) 47.2 ‐‐ ‐‐ Within Background 7440‐50‐8 Copper 46 / 46 0.129 : 0.901 0.478 : 2.04 2.8 ‐ 42.1 B29‐15 2.5 ‐ 3 (ft) 20 ‐‐ 42.1 MAX 7439‐92‐1 Lead 46 / 46 0.126 : 0.657 0.478 : 2.04 1.6 ‐ 41 B29‐20 0.5 ‐ 1 (ft) 15 ‐‐ 41 MAX 7439‐97‐6 Mercury 29 / 46 0.00559 : 0.0135 0.0794 : 0.14 0.00562 ‐ 0.0515 B29‐10 0.5 ‐ 1 (ft) 0.25 ‐‐ ‐‐ Within Background 7439‐98‐7 Molybdenum 10 / 46 0.126 : 0.627 0.239 : 2.04 0.143 ‐ 0.851 B29‐05 1.5 ‐ 2 (ft) 2.76 ‐‐ ‐‐ Within Background 7440‐02‐0 Nickel 46 / 46 0.139 : 0.47 0.239 : 2.04 2.94 ‐ 9.63 B29‐17 2.5 ‐ 3 (ft) 83 ‐‐ ‐‐ Within Background 7782‐49‐2 Selenium 13 / 46 0.287 : 1.08 0.718 : 3.2 0.307 ‐ 1.14 B29‐21 0.5 ‐ 1 (ft) 7.67 ‐‐ ‐‐ Within Background 7440‐22‐4 Silver 3 / 46 0.082 : 0.582 0.239 : 1.53 0.106 ‐ 0.414 B29‐15 0.5 ‐ 1 (ft) 10 ‐‐ ‐‐ Within Background 7440‐28‐0 Thallium 17 / 46 0.145 : 5.95 0.718 : 10.2 0.168 ‐ 0.488 B29‐09 0.5 ‐ 1 (ft) 2.2 ‐‐ ‐‐ Within Background 7440‐62‐2 Vanadium 46 / 46 0.135 : 0.688 0.239 : 1.1 16.6 ‐ 61.9 NCW‐021B 5 (ft) 74.4 ‐‐ ‐‐ Within Background 7440‐66‐6 Zinc 46 / 46 0.17 : 4.03 0.957 : 5.4 13.7 ‐ 255 B29‐20 0.5 ‐ 1 (ft) 38 ‐‐ 255 MAX PCBs (mg/kg)
TOTALPCB Total PCBs 10 / 82 0.00537 : 0.15 0.017 : 0.25 0.00566 ‐ 1.3 B29‐05 1.5 ‐ 2 (ft) ‐‐ 0.087 0.087 95%UCL PEST (mg/kg)
50‐29‐3 4,4'‐DDT 1 / 11 0.0022 : 0.0022 0.005 : 0.005 0.021 ‐ 0.021 B29‐05 1.5 ‐ 2 (ft) ‐‐ ‐‐ 0.021 MAX SVOCs (mg/kg)
83‐32‐9 Acenaphthene 1 / 17 0.004 : 0.32 0.015 : 2.5 0.028 ‐ 0.028 B29‐06 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.028 MAX 208‐96‐8 Acenaphthylene 1 / 17 0.0041 : 0.3 0.03 : 2.5 0.015 ‐ 0.015 B29‐06 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.015 MAX120‐12‐7 Anthracene 1 / 17 0.002 : 0.32 0.0099 : 2.5 0.0075 ‐ 0.0075 B29‐05 1.5 ‐ 2 (ft) ‐‐ ‐‐ 0.0075 MAX 56‐55‐3 Benzo(a)anthracene 1 / 17 0.0024 : 0.28 0.0099 : 2.5 0.008 ‐ 0.008 B29‐05 1.5 ‐ 2 (ft) ‐‐ ‐‐ 0.008 MAX 50‐32‐8 Benzo(a)pyrene 6 / 17 0.002 : 0.27 0.0099 : 2.5 0.01 ‐ 0.048 B29‐12 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.048 MAX 205‐99‐2 Benzo(b)fluoranthene 7 / 17 0.0021 : 0.32 0.0099 : 2.5 0.0041 ‐ 0.071 B29‐12 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.071 MAX191‐24‐2 Benzo(g,h,i)perylene 4 / 17 0.0018 : 0.28 0.0099 : 2.5 0.014 ‐ 0.026 B29‐07 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.026 MAX207‐08‐9 Benzo(k)fluoranthene 6 / 17 0.0017 : 0.32 0.0099 : 2.5 0.025 ‐ 0.11 B29‐06 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.11 MAX 218‐01‐9 Chrysene 3 / 17 0.002 : 0.32 0.0099 : 2.5 0.0025 ‐ 0.016 B29‐05 1.5 ‐ 2 (ft) ‐‐ ‐‐ 0.016 MAX 53‐70‐3 Dibenz(a,h)anthracene 2 / 17 0.0029 : 0.23 0.0099 : 2.5 0.19 ‐ 0.63 B29‐12 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.63 MAX Maximum Detected Result Metals
Background
Concentration
95%UCL EPC Basis
Location Depth
Range of Detected
Concentrations CASRN Chemical Name Frequency of Detection Range of Method Detection Limits for Non‐ Detects
Range of Reporting
Limits for Non‐Detects
HALEY & ALDRICH, INC.
2022_0608_HAI_T05_MinMax_SO_B29.xlsx
JULY 2022
TABLE 5
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SOIL, BUILDING 29 EXPOSURE AREA ROGH INC. ‐  PARCEL A

CHULA VISTA, CALIFORNIA

Maximum Detected Result Metals
Background
Concentration
95%UCL EPC Basis
Location Depth
Range of Detected
Concentrations CASRN Chemical Name Frequency of Detection Range of Method Detection Limits for Non‐ Detects
Range of Reporting
Limits for Non‐Detects
SVOCs (mg/kg)
131‐11‐3 Dimethyl phthalate 1 / 7 0.11 : 0.57 0.5 : 2.5 0.25 ‐ 0.25 B29‐11 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.25 MAX 206‐44‐0 Fluoranthene 1 / 17 0.0021 : 0.31 0.0099 : 2.5 0.12 ‐ 0.12 B29‐05 1.5 ‐ 2 (ft) ‐‐ ‐‐ 0.12 MAX 86‐73‐7 Fluorene 1 / 17 0.0017 : 0.32 0.0099 : 2.5 0.0034 ‐ 0.0034 B29‐06 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.0034 MAX 193‐39‐5 Indeno(1,2,3‐cd)pyrene 2 / 17 0.0022 : 0.27 0.0099 : 2.5 0.33 ‐ 0.72 B29‐12 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.72 MAX 85‐01‐8 Phenanthrene 4 / 17 0.0021 : 0.34 0.0099 : 2.5 0.0022 ‐ 0.045 B29‐05 1.5 ‐ 2 (ft) ‐‐ ‐‐ 0.045 MAX 129‐00‐0 Pyrene 5 / 17 0.0029 : 0.38 0.0099 : 2.5 0.0037 ‐ 0.029 B29‐05 1.5 ‐ 2 (ft) ‐‐ ‐‐ 0.029 MAX VOCs (mg/kg)
71‐55‐6 1,1,1‐Trichloroethane 1 / 152 0.00022 : 0.000278 0.00097 : 0.0071 0.000525 ‐ 0.000525 B29‐32C 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.000525 MAX 526‐73‐8 1,2,3‐Trimethylbenzene 3 / 44 0.00115 : 0.00116 0.005 : 0.00505 0.00124 ‐ 0.00788 B29‐33B 1.5 ‐ 5 (ft) ‐‐ ‐‐ 0.00788 MAX 95‐63‐6 1,2,4‐Trimethylbenzene 6 / 152 0.00056 : 0.00117 0.0019 : 0.0071 0.00117 ‐ 0.0052 B29‐21 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.0052 MAX 108‐67‐8 1,3,5‐Trimethylbenzene 2 / 152 0.00026 : 0.00109 0.0019 : 0.0071 0.0018 ‐ 0.00183 B29‐33B 1.5 ‐ 5 (ft) ‐‐ ‐‐ 0.00183 MAX 78‐93‐32‐Butanone (Methyl Ethyl Ketone) 42 / 152 0.0036 : 0.0126 0.019 : 0.14 0.0158 ‐ 0.0631 B29‐33B 1.5 ‐ 5 (ft) ‐‐ ‐‐ 0.0631 MAX 67‐64‐1 Acetone 16 / 152 0.006 : 0.0138 0.019 : 0.14 0.0069 ‐ 0.21 PW‐11 1.5 ‐ 1.5 (ft) ‐‐ ‐‐ 0.21 MAX 71‐43‐2 Benzene 2 / 152 0.00012 : 0.000404 0.00097 : 0.0071 0.0004 ‐ 0.000725 B29‐32C 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.000725 MAX 67‐66‐3 Chloroform (Trichloromethane) 16 / 152 0.00023 : 0.00059 0.00097 : 0.0071 0.000441 ‐ 0.019 B29‐24 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.019 MAX 156‐59‐2 cis‐1,2‐Dichloroethene 5 / 152 0.00027 : 0.000697 0.00097 : 0.0071 0.00032 ‐ 0.0274 B29‐35C 4.5 ‐ 5 (ft) ‐‐ ‐‐ 0.0274 MAX 99‐87‐6 Cymene (p‐Isopropyltoluene) 1 / 152 0.00027 : 0.00235 0.00097 : 0.0071 0.00066 ‐ 0.00066 B29‐21 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.00066 MAX 1634‐04‐4 Methyl Tert Butyl Ether (MTBE) 1 / 152 0.00018 : 0.00031 0.001 : 0.0071 0.000675 ‐ 0.000675 B29‐27 4.5 ‐ 5 (ft) ‐‐ ‐‐ 0.000675 MAX 75‐09‐2 Methylene chloride (Dichlorometha 3 / 152 0.0013 : 0.00671 0.0042 : 0.052 0.00913 ‐ 0.0104 B29‐29 4.5 ‐ 5 (ft) ‐‐ ‐‐ 0.0104 MAX 91‐20‐3 Naphthalene 1 / 152 0.00078 : 0.0052 0.0042 : 0.052 0.0113 ‐ 0.0113 B29‐33B 1.5 ‐ 5 (ft) ‐‐ ‐‐ 0.0113 MAX 104‐51‐8n‐Butylbenzene 1 / 152 0.00015 : 0.00388 0.00097 : 0.0126 0.00067 ‐ 0.00067 B29‐21 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.00067 MAX 127‐18‐4 Tetrachloroethene 16 / 152 0.0002 : 0.000707 0.00097 : 0.0071 0.00054 ‐ 1.26 B29‐28 0.5 ‐ 1 (ft) ‐‐ ‐‐ 1.26 MAX 156‐60‐5 trans‐1,2‐Dichloroethene 1 / 152 0.00029 : 0.00144 0.00097 : 0.0071 0.0018 ‐ 0.0018 B29‐23 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.0018 MAX 79‐01‐6 Trichloroethene 40 / 152 0.00029 : 0.077 0.001 : 0.4 0.00064 ‐ 37.8 B29‐23 0.5 ‐ 1 (ft) ‐‐ 0.035 0.035 95%UCL NOTES AND ABBREVIATIONS:

Detected VOCs and SVOCs are shown.
mg/kg = milligrams per kilogram.

The total PCB concentration was calculated as the addition of detected concentrations of Aroclor 1242, 1254, and 1260 for each sample and these total PCB concentrations were then used to derive the 95% Upper Confidence Limit concentration of the mean which was used as the exposure point concentration (presented in the table above and in the Appendix D risk assessment calculations as Aroclor 1254).

HALEY & ALDRICH, INC.
2022_0608_HAI_T05_MinMax_SO_B29.xlsx
JULY 2022
TABLE 6
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SOIL, BUILDING 29 EXPOSURE AREA (PLANNED LOADING DOCK EXCAVATION AREA ONLY) ROHR INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

Metals (mg/kg)
7440‐36‐0 Antimony 1 / 5 0.145 : 0.156 0.728 : 3.2 1.18 ‐ 1.18 B29‐05 1.5 ‐ 2 (ft) 7.84 ‐‐ ‐‐ Within Background 7440‐38‐2 Arsenic 5 / 5 0.252 : 0.271 0.728 : 1.1 2.02 ‐ 5.7 PW‐07 1.5 ‐ 1.5 (ft) 8 ‐‐ ‐‐ Within Background7440‐39‐3 Barium 5 / 5 0.15 : 0.162 0.485 : 1.1 44.5 ‐ 71.6 B29‐06 0.5 ‐ 1 (ft) 152 ‐‐ ‐‐ Within Background7440‐41‐7 Beryllium 4 / 5 0.133 : 0.143 0.243 : 0.53 0.168 ‐ 0.395 B29‐06 0.5 ‐ 1 (ft) 0.543 ‐‐ ‐‐ Within Background7440‐43‐9 Cadmium 5 / 5 0.131 : 0.142 0.485 : 0.53 0.287 ‐ 0.96 PW‐07 1.5 ‐ 1.5 (ft) 5.29 ‐‐ ‐‐ Within Background7440‐47‐3 Chromium 5 / 5 0.138 : 0.149 0.243 : 1.1 8.14 ‐ 16 B29‐06 0.5 ‐ 1 (ft) 38 ‐‐ ‐‐ Within Background7440‐48‐4 Cobalt 5 / 5 0.144 : 0.155 0.243 : 0.53 4.55 ‐ 9.87 B29‐06 0.5 ‐ 1 (ft) 47.2 ‐‐ ‐‐ Within Background7440‐50‐8 Copper 5 / 5 0.131 : 0.141 0.485 : 1.1 8.32 ‐ 41 PW‐07 1.5 ‐ 1.5 (ft) 20 ‐‐ 41 Max7439‐92‐1 Lead 5 / 5 0.128 : 0.138 0.485 : 1.1 4.92 ‐ 26 PW‐07 1.5 ‐ 1.5 (ft) 15 ‐‐ 26 Max7439‐97‐6 Mercury 4 / 5 0.00559 : 0.00578 0.0794 : 0.13 0.00779 ‐ 0.0357 B29‐06 4.5 ‐ 5 (ft) 0.25 ‐‐ ‐‐ Within Background7439‐98‐7 Molybdenum 2 / 5 0.128 : 0.138 0.243 : 1.1 0.219 ‐ 0.851 B29‐05 1.5 ‐ 2 (ft) 2.76 ‐‐ ‐‐ Within Background7440‐02‐0 Nickel 5 / 5 0.141 : 0.152 0.243 : 1.1 6.32 ‐ 8.88 B29‐06 0.5 ‐ 1 (ft) 83 ‐‐ ‐‐ Within Background7782‐49‐2 Selenium 2 / 5 0.291 : 0.314 0.728 : 3.2 0.516 ‐ 0.643 B29‐05 4.5 ‐ 5 (ft) 7.67 ‐‐ ‐‐ Within Background7440‐62‐2 Vanadium 5 / 5 0.137 : 0.148 0.243 : 1.1 19.5 ‐ 46.4 B29‐06 0.5 ‐ 1 (ft) 74.4 ‐‐ ‐‐ Within Background7440‐66‐6 Zinc 5 / 5 0.172 : 0.186 0.971 : 5.3 23.9 ‐ 51 PW‐07 1.5 ‐ 1.5 (ft) 38 ‐‐ 51 Max PCBs (mg/kg)
TOTALPCB Total PCBs 6 / 17 0.00537 : 0.15 0.017 : 0.25 0.00566 ‐ 1.3 B29‐05 1.5 ‐ 2 (ft) ‐‐ ‐‐ 1.3 Max PEST (mg/kg)
50‐29‐3 4,4'‐DDT 1 / 1 0.0022 : 0.0022 0.005 : 0.005 0.021 ‐ 0.021 B29‐05 1.5 ‐ 2 (ft) ‐‐ ‐‐ 0.021 Max SVOCs (mg/kg)
83‐32‐9 Acenaphthene 1 / 3 0.004 : 0.32 0.015 : 2.5 0.028 ‐ 0.028 B29‐06 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.028 Max 208‐96‐8 Acenaphthylene 1 / 3 0.0041 : 0.3 0.03 : 2.5 0.015 ‐ 0.015 B29‐06 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.015 Max120‐12‐7 Anthracene 1 / 3 0.002 : 0.31 0.0099 : 2.5 0.0075 ‐ 0.0075 B29‐05 1.5 ‐ 2 (ft) ‐‐ ‐‐ 0.0075 Max 56‐55‐3 Benzo(a)anthracene 1 / 3 0.0024 : 0.28 0.0099 : 2.5 0.008 ‐ 0.008 B29‐05 1.5 ‐ 2 (ft) ‐‐ ‐‐ 0.008 Max50‐32‐8 Benzo(a)pyrene 2 / 3 0.002 : 0.27 0.0099 : 2.5 0.016 ‐ 0.02 B29‐06 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.02 Max 205‐99‐2 Benzo(b)fluoranthene 2 / 3 0.0021 : 0.32 0.0099 : 2.5 0.017 ‐ 0.018 B29‐05 1.5 ‐ 2 (ft) ‐‐ ‐‐ 0.018 Max191‐24‐2 Benzo(g,h,i)perylene 1 / 3 0.0018 : 0.27 0.0099 : 2.5 0.014 ‐ 0.014 B29‐06 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.014 Max207‐08‐9 Benzo(k)fluoranthene 2 / 3 0.0017 : 0.32 0.0099 : 2.5 0.025 ‐ 0.11 B29‐06 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.11 Max218‐01‐9 Chrysene 2 / 3 0.002 : 0.32 0.0099 : 2.5 0.0025 ‐ 0.016 B29‐05 1.5 ‐ 2 (ft) ‐‐ ‐‐ 0.016 Max206‐44‐0 Fluoranthene 1 / 3 0.0021 : 0.31 0.0099 : 2.5 0.12 ‐ 0.12 B29‐05 1.5 ‐ 2 (ft) ‐‐ ‐‐ 0.12 Max 86‐73‐7 Fluorene 1 / 3 0.0017 : 0.32 0.0099 : 2.5 0.0034 ‐ 0.0034 B29‐06 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.0034 Max85‐01‐8 Phenanthrene 1 / 3 0.0021 : 0.34 0.0099 : 2.5 0.045 ‐ 0.045 B29‐05 1.5 ‐ 2 (ft) ‐‐ ‐‐ 0.045 Max 129‐00‐0 Pyrene 2 / 3 0.0029 : 0.38 0.0099 : 2.5 0.01 ‐ 0.029 B29‐05 1.5 ‐ 2 (ft) ‐‐ ‐‐ 0.029 Max Range of Detected
Concentrations CASRN Chemical Name Frequency of Detection Range of Method Detection Limits for Non‐ Detects
Range of Reporting
Limits for Non‐Detects
Maximum Detected Result Metals
Background
Concentration
95%UCL EPC Basis Location Depth
HALEY & ALDRICH, INC.
2022_0608_HAI_T06_MinMax_B29_Exc_Area.xlsx JULY 2022
TABLE 6
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SOIL, BUILDING 29 EXPOSURE AREA (PLANNED LOADING DOCK EXCAVATION AREA ONLY) ROHR INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

Range of Detected
Concentrations CASRN Chemical Name Frequency of Detection Range of Method Detection Limits for Non‐ Detects
Range of Reporting
Limits for Non‐Detects
Maximum Detected Result Metals
Background
Concentration
95%UCL EPC Basis Location Depth
VOCs (mg/kg)
71‐55‐6 1,1,1‐Trichloroethane 1 / 33 0.00022 : 0.000278 0.00098 : 0.0057 0.000525 ‐ 0.000525 B29‐32C 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.000525 Max 526‐73‐8 1,2,3‐Trimethylbenzene 1 / 20 0.00115 : 0.00116 0.005 : 0.00505 0.00125 ‐ 0.00125 B29‐26 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.00125 Max 95‐63‐6 1,2,4‐Trimethylbenzene 3 / 33 0.00057 : 0.00117 0.002 : 0.0057 0.00117 ‐ 0.00303 B29‐26 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.00303 Max78‐93‐32‐Butanone (Methyl Ethyl Ketone) 19 / 33 0.0037 : 0.0126 0.02 : 0.11 0.0158 ‐ 0.0455 B29‐25 4.5 ‐ 5 (ft) ‐‐ ‐‐ 0.0455 Max67‐64‐1 Acetone 2 / 33 0.0061 : 0.0138 0.02 : 0.13 0.022 ‐ 0.15 PW‐07 1.5 ‐ 1.5 (ft) ‐‐ ‐‐ 0.15 Max71‐43‐2 Benzene 2 / 33 0.00013 : 0.000404 0.00098 : 0.0057 0.0004 ‐ 0.000725 B29‐32C 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.000725 Max67‐66‐3 Chloroform (Trichloromethane) 14 / 33 0.00023 : 0.00059 0.00098 : 0.0057 0.0005 ‐ 0.019 B29‐24 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.019 Max 156‐59‐2 cis‐1,2‐Dichloroethene 1 / 33 0.00027 : 0.000697 0.00098 : 0.0057 0.00153 ‐ 0.00153 B29‐23 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.00153 Max 1634‐04‐4 Methyl Tert Butyl Ether (MTBE) 1 / 33 0.00018 : 0.0003 0.001 : 0.0057 0.000675 ‐ 0.000675 B29‐27 4.5 ‐ 5 (ft) ‐‐ ‐‐ 0.000675 Max 75‐09‐2 Methylene chloride (Dichloromethane) 2 / 33 0.0013 : 0.00671 0.0057 : 0.051 0.00913 ‐ 0.00953 B29‐32A 4.5 ‐ 5 (ft) ‐‐ ‐‐ 0.00953 Max 127‐18‐4 Tetrachloroethene 11 / 33 0.0002 : 0.000707 0.00098 : 0.0057 0.0011 ‐ 1.26 B29‐28 0.5 ‐ 1 (ft) ‐‐ ‐‐ 1.26 Max156‐60‐5 trans‐1,2‐Dichloroethene 1 / 33 0.00029 : 0.00144 0.00098 : 0.0057 0.0018 ‐ 0.0018 B29‐23 0.5 ‐ 1 (ft) ‐‐ ‐‐ 0.0018 Max 79‐01‐6 Trichloroethene 23 / 33 0.00029 : 0.077 0.001 : 0.4 0.00228 ‐ 37.8 B29‐23 0.5 ‐ 1 (ft) ‐‐ 8.83 8.83 95%UCL NOTES AND ABBREVIATIONS:

Detected VOCs and SVOCs are shown.
mg/kg = milligrams per kilogram.

The total PCB concentration was calculated as the addition of detected concentrations of Aroclor 1242, 1254, and 1260 for each sample and these total PCB concentrations were then used to derive the 95% Upper Confidence Limit concentration of the mean which was used as the exposure point concentration (presented in the table above and in the Appendix D risk assessment calculations as Aroclor 1254).

HALEY & ALDRICH, INC.
2022_0608_HAI_T06_MinMax_B29_Exc_Area.xlsx JULY 2022
TABLE 7
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SUB‐SLAB SOIL VAPOR, BUILDING 99/100 EXPOSURE AREA ROHR INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

Exposure AreaLocation B99‐V01 B99‐V02 B99‐V03 B99‐V04 B99‐V05 B99‐V06 B100‐V01 B100‐V02 B100‐V03 B100‐V03 Sample Name B99‐SV01‐1' B99‐SV02‐1' B99‐SV03‐1' B99‐SV04‐1' B99‐SV05‐1' B99‐SV06‐1' B100‐SV01‐1' B100‐SV02‐1' B100‐SV03‐1' Rep B100‐SV03‐1' Sample Date 5/25/2018 5/25/2018 5/25/2018 5/25/2018 5/25/2018 5/25/2018 5/25/2018 5/25/2018 5/25/2018 5/25/2018 Sample Depth 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) VOCs (µg/m3)
1,1,1,2‐Tetrachloroethane < 70 < 70 < 70 < 70 < 70 < 70 < 70 < 70 < 70 < 70 1,1,1‐Trichloroethane < 28 < 28 < 28 < 28 < 28 < 28 < 28 < 28 < 28 < 28 1,1,2,2‐Tetrachloroethane < 70 < 70 < 70 < 70 < 70 < 70 < 70 < 70 < 70 < 70 1,1,2‐Trichloroethane < 55 < 55 < 55 < 55 < 55 < 55 < 55 < 55 < 55 < 55 1,1‐Dichloroethane < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 1,1‐Dichloroethene < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 1,1‐Difluoroethane < 27 < 27 < 27 < 27 < 27 < 27 < 27 < 27 < 27 < 27 1,2,3‐Trichloropropane ‐‐‐‐‐‐‐‐‐‐
1,2,4‐Trichlorobenzene < 75 < 75 < 75 < 75 < 75 < 75 < 75 < 75 < 75 < 75 1,2,4‐Trimethylbenzene < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 1,2‐Dibromoethane (Ethylene Dibromide) < 39 < 39 < 39 < 39 < 39 < 39 < 39 < 39 < 39 < 39 1,2‐Dichlorobenzene < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 1,2‐Dichloroethane < 21 < 21 < 21 < 21 < 21 < 21 < 21 < 21 < 21 < 21 1,2‐Dichloropropane < 47 < 47 < 47 < 47 < 47 < 47 < 47 < 47 < 47 < 47 1,2‐Dichlorotetrafluoroethane (CFC 114) < 71 < 71 < 71 < 71 < 71 < 71 < 71 < 71 < 71 < 71 1,3,5‐Trimethylbenzene < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 1,3‐Butadiene ‐‐‐‐‐‐‐‐‐‐
1,3‐Dichlorobenzene < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 1,4‐Dichlorobenzene < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 1,4‐Dioxane ‐‐‐‐‐‐‐‐‐‐
2,2,4‐Trimethylpentane ‐‐‐‐‐‐‐‐‐‐
2‐Butanone (Methyl Ethyl Ketone) < 60 < 60 < 60 < 60 < 60 < 60 < 60 < 60 < 60 < 60 2‐Hexanone < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 2‐Phenylbutane (sec‐Butylbenzene) ‐‐‐‐‐‐‐‐‐‐
4‐Ethyl toluene < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 4‐Methyl‐2‐Pentanone (Methyl Isobutyl Ketone) < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 Acetone ‐‐‐‐‐‐‐‐‐‐Allyl chloride ‐‐‐‐‐‐‐‐‐‐
Benzene < 16 < 16 < 16 < 16 < 16 < 16 < 16 < 16 < 16 < 16 Benzyl Chloride ‐‐‐‐‐‐‐‐‐‐
Bromodichloromethane < 68 < 68 < 68 < 68 < 68 < 68 < 68 < 68 < 68 < 68 Bromoform < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 Bromomethane (Methyl Bromide) < 39 < 39 < 39 < 39 < 39 < 39 < 39 < 39 < 39 < 39 Carbon disulfide < 32 < 32 < 32 < 32 < 32 < 32 < 32 < 32 < 32 < 32 Carbon tetrachloride < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 Chlorobenzene < 23 < 23 < 23 < 23 < 23 < 23 < 23 < 23 < 23 < 23 Chloroethane < 27 < 27 < 27 < 27 < 27 < 27 < 27 < 27 < 27 < 27 Chloroform (Trichloromethane) < 25 < 25 < 25 < 25 < 25 < 25 < 25 < 25 < 25 < 25 Chloromethane (Methyl Chloride) < 21 < 21 < 21 < 21 < 21 < 21 < 21 < 21 < 21 < 21 Building 99/100 Exposure Area
HALEY & ALDRICH, INC.
2022_0608_HAI_T07_subslab_B99.xlsx JULY 2022
TABLE 7
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SUB‐SLAB SOIL VAPOR, BUILDING 99/100 EXPOSURE AREA ROHR INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

Exposure AreaLocation B99‐V01 B99‐V02 B99‐V03 B99‐V04 B99‐V05 B99‐V06 B100‐V01 B100‐V02 B100‐V03 B100‐V03 Sample Name B99‐SV01‐1' B99‐SV02‐1' B99‐SV03‐1' B99‐SV04‐1' B99‐SV05‐1' B99‐SV06‐1' B100‐SV01‐1' B100‐SV02‐1' B100‐SV03‐1' Rep B100‐SV03‐1' Sample Date 5/25/2018 5/25/2018 5/25/2018 5/25/2018 5/25/2018 5/25/2018 5/25/2018 5/25/2018 5/25/2018 5/25/2018 Sample Depth 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) VOCs (µg/m3)
Building 99/100 Exposure Area
cis‐1,2‐Dichloroethene < 40 < 40 < 40 < 40 < 40 < 40 < 40 < 40 < 40 < 40 cis‐1,3‐Dichloropropene < 46 < 46 < 46 < 46 < 46 < 46 < 46 < 46 < 46 < 46 Cyclohexane ‐‐‐‐‐‐‐‐‐‐Cymene (p‐Isopropyltoluene) ‐‐‐‐‐‐‐‐‐‐ Dibromochloromethane < 86 < 86 < 86 < 86 < 86 < 86 < 86 < 86 < 86 < 86 Dichlorodifluoromethane (CFC‐12) < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 Ethyl acetate ‐‐‐‐‐‐‐‐‐‐
Ethylbenzene < 22 < 22 < 22 < 22 < 22 < 22 < 22 < 22 < 22 < 22 Hexachlorobutadiene < 110 < 110 < 110 < 110 < 110 < 110 < 110 < 110 < 110 < 110Hexane ‐‐‐‐‐‐‐‐‐‐Isobutane ‐‐‐‐‐‐‐‐‐‐Isopropyl Alcohol (2‐Propanol) ‐‐‐‐‐‐‐‐‐‐ Isopropylbenzene (Cumene) ‐‐‐‐‐‐‐‐‐‐
m,p‐Xylenes < 44 < 44 < 44 < 44 < 44 < 44 < 44 < 44 < 44 < 44 Methyl Tert Butyl Ether ‐‐‐‐‐‐‐‐‐‐
Methylene chloride < 35 < 35 < 35 < 35 < 35 < 35 < 35 < 35 < 35 < 35 Naphthalene ‐‐‐‐‐‐‐‐‐‐N‐Heptane ‐‐‐‐‐‐‐‐‐‐
n‐Propylbenzene ‐‐‐‐‐‐‐‐‐‐
o‐Xylene < 22 < 22 < 22 < 22 < 22 < 22 < 22 < 22 < 22 < 22 Propylene (Propene) ‐‐‐‐‐‐‐‐‐‐
Styrene 80 61 64 < 43 82 63 < 43 69 < 43 < 43
Tetrachloroethene < 34 < 34 < 34 < 34 < 34 < 34 < 34 < 34 < 34 < 34Tetrahydrofuran ‐‐‐‐‐‐‐‐‐‐Toluene < 38 < 38 < 38 < 38 < 38 < 38 < 38 < 38 < 38 < 38trans‐1,2‐Dichloroethene < 40 < 40 < 40 < 40 < 40 < 40 < 40 < 40 < 40 < 40 trans‐1,3‐Dichloropropene < 46 < 46 < 46 < 46 < 46 < 46 < 46 < 46 < 46 < 46 Trichloroethene < 27 < 27 < 27 < 27 32 < 27 30 < 27 < 27 < 27 Trichlorofluoromethane (CFC‐11) < 56 < 56 < 56 < 56 < 56 < 56 < 56 < 56 < 56 < 56 Trifluorotrichloroethane (Freon 113) < 77 < 77 < 77 < 77 < 77 < 77 < 77 < 77 < 77 < 77 Vinyl acetate ‐‐‐‐‐‐‐‐‐‐
Vinyl Bromide (Bromoethene) ‐‐‐‐‐‐‐‐‐‐
Vinyl chloride < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 NOTES AND ABBREVIATIONS:

Volatile Organic Compounds (VOCs) analyzed by EPA Method TO‐15.

BOLD = concentration detected at or above reported detection limit. < = analyte not detected above the indicated reporting limit. ‐ = not analyzed or not applicable.
µg/m3 = micrograms per cubic meter.

HALEY & ALDRICH, INC.
2022_0608_HAI_T07_subslab_B99.xlsx JULY 2022
TABLE 8
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SUB‐SLAB SOIL VAPOR, BUILDING 29 EXPOSURE AREA ROHR INC. ‐ PARCEL ACHULA VISTA, CALIFORNIA

Location B29‐V04 B29‐V05 B29‐V06 B29‐V07 B29‐V08 B29‐V09 B29‐V10 B29‐V11 B29‐V12 B29‐V13 B29‐V14 Sample Name B29‐SV04‐1' B29‐V05‐1' B29‐SV06‐1' B29‐SV07‐1' B29‐SV08‐1' B29‐V09‐1' B29‐V10‐1' B29‐V11‐1' B29‐V12‐1' B29‐V13‐1' B29‐V14‐1' Sample Date 05/23/2018 05/22/2018 05/23/2018 05/23/2018 05/24/2018 05/22/2018 05/22/2018 05/22/2018 05/22/2018 05/22/2018 05/22/2018 Sample Depth (bgs) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) Volatile Organic Compounds (µg/m3)
1,1,1,2‐Tetrachloroethane < 70 < 70 < 70 < 70 < 70 < 70 < 70 < 70 < 70 < 70 < 70 1,1,1‐Trichloroethane < 28 46 < 28 < 28 < 28 110 < 28 < 28 < 28 < 28 46 1,1,2,2‐Tetrachloroethane < 70 < 70 < 70 < 70 < 70 < 70 < 70 < 70 < 70 < 70 < 70 1,1,2‐Trichloroethane < 55 < 55 < 55 < 55 < 55 < 55 < 55 < 55 < 55 < 55 < 55 1,1‐Dichloroethane < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 1,1‐Dichloroethene < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 1,1‐Dichloropropene ‐‐‐‐‐‐‐‐‐‐‐
1,1‐Difluoroethane < 27 < 27 < 27 < 27 < 27 < 27 < 27 < 27 < 27 < 27 < 27 1,2,3‐Trichlorobenzene ‐‐‐‐‐‐‐‐‐‐‐
1,2,3‐Trichloropropane ‐‐‐‐‐‐‐‐‐‐‐
1,2,4‐Trichlorobenzene < 75 < 75 < 75 < 75 < 75 < 75 < 75 < 75 < 75 < 75 < 75 1,2,4‐Trimethylbenzene < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 1,2‐Dibromo‐3‐chloropropane (DBCP) ‐‐‐‐‐‐‐‐‐‐‐
1,2‐Dibromoethane (Ethylene Dibromide) < 39 < 39 < 39 < 39 < 39 < 39 < 39 < 39 < 39 < 39 < 39 1,2‐Dichlorobenzene < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 1,2‐Dichloroethane < 21 < 21 < 21 < 21 < 21 < 21 < 21 < 21 < 21 < 21 < 21 1,2‐Dichloropropane < 47 < 47 < 47 < 47 < 47 < 47 < 47 < 47 < 47 < 47 < 47 1,2‐Dichlorotetrafluoroethane (CFC 114) < 71 < 71 < 71 < 71 < 71 < 71 < 71 < 71 < 71 < 71 < 71 1,3,5‐Trimethylbenzene < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 1,3‐Butadiene ‐‐‐‐‐‐‐‐‐‐‐
1,3‐Dichlorobenzene < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 1,3‐Dichloropropane ‐‐‐‐‐‐‐‐‐‐‐
1,4‐Dichlorobenzene < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 < 61 1,4‐Dioxane ‐‐‐‐‐‐‐‐‐‐‐
2,2,4‐Trimethylpentane ‐‐‐‐‐‐‐‐‐‐‐2,2‐Dichloropropane ‐‐‐‐‐‐‐‐‐‐‐ 2‐Butanone (Methyl Ethyl Ketone) < 60 < 60 < 60 < 60 < 60 < 60 < 60 < 60 < 60 < 60 < 60 2‐Chlorotoluene ‐‐‐‐‐‐‐‐‐‐‐
2‐Hexanone (Methyl Butyl Ketone) < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 2‐Phenylbutane (sec‐Butylbenzene) ‐‐‐‐‐‐‐‐‐‐‐
4‐Chlorotoluene ‐‐‐‐‐‐‐‐‐‐‐
4‐Ethyltoluene (1‐Ethyl‐4‐Methylbenzene) < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 4‐Methyl‐2‐Pentanone (Methyl Isobutyl Ketone) < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 < 41 Acetone ‐‐‐‐‐‐‐‐‐‐‐Allyl chloride ‐‐‐‐‐‐‐‐‐‐‐
Benzene < 16 27 < 16 < 16 < 16 < 16 < 16 < 16 < 16 < 16 < 16 Benzyl Chloride (alpha‐Chlorotoluene) ‐‐‐‐‐‐‐‐‐‐‐
Bromobenzene ‐‐‐‐‐‐‐‐‐‐‐Bromodichloromethane < 68 < 68 < 68 < 68 < 68 < 68 < 68 < 68 < 68 < 68 < 68 Bromoform < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 Bromomethane (Methyl Bromide) < 39 < 39 < 39 < 39 < 39 < 39 < 39 < 39 < 39 < 39 < 39 Carbon disulfide < 32 < 32 < 32 < 32 < 32 < 32 < 32 < 32 < 32 < 32 < 32 Carbon tetrachloride < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 Chlorobenzene < 23 < 23 < 23 < 23 < 23 < 23 < 23 < 23 < 23 < 23 < 23 Chlorobromomethane ‐‐‐‐‐‐‐‐‐‐‐Chloroethane < 27 < 27 < 27 < 27 < 27 < 27 < 27 < 27 < 27 < 27 < 27 HALEY & ALDRICH, INC.
2022_0608_HAI_T08_sublsab_B29.xlsx JULY 2022
TABLE 8
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SUB‐SLAB SOIL VAPOR, BUILDING 29 EXPOSURE AREA ROHR INC. ‐ PARCEL ACHULA VISTA, CALIFORNIA

Location B29‐V04 B29‐V05 B29‐V06 B29‐V07 B29‐V08 B29‐V09 B29‐V10 B29‐V11 B29‐V12 B29‐V13 B29‐V14 Sample Name B29‐SV04‐1' B29‐V05‐1' B29‐SV06‐1' B29‐SV07‐1' B29‐SV08‐1' B29‐V09‐1' B29‐V10‐1' B29‐V11‐1' B29‐V12‐1' B29‐V13‐1' B29‐V14‐1' Sample Date 05/23/2018 05/22/2018 05/23/2018 05/23/2018 05/24/2018 05/22/2018 05/22/2018 05/22/2018 05/22/2018 05/22/2018 05/22/2018 Sample Depth (bgs) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) Volatile Organic Compounds (µg/m3)
Chloroform (Trichloromethane) < 25 < 25 < 25 240 < 25 170 < 25 < 25 < 25 < 25 < 25 Chloromethane (Methyl Chloride) < 21 < 21 < 21 < 21 < 21 < 21 < 21 < 21 < 21 < 21 < 21 cis‐1,2‐Dichloroethene < 40 < 40 < 40 < 40 < 40 < 40 < 40 < 40 < 40 < 40 < 40 cis‐1,3‐Dichloropropene < 46 < 46 < 46 < 46 < 46 < 46 < 46 < 46 < 46 < 46 < 46 Cyclohexane ‐‐‐‐‐‐‐‐‐‐‐Cymene (p‐Isopropyltoluene) ‐‐‐‐‐‐‐‐‐‐‐ Dibromochloromethane < 86 < 86 < 86 < 86 < 86 < 86 < 86 < 86 < 86 < 86 < 86 Dibromomethane ‐‐‐‐‐‐‐‐‐‐‐Dichlorodifluoromethane (CFC‐12) < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 < 50 Ethyl acetate ‐‐‐‐‐‐‐‐‐‐‐
Ethylbenzene < 22 47 < 22 < 22 < 22 < 22 < 22 < 22 < 22 < 22 < 22 Hexachlorobutadiene < 110 < 110 < 110 < 110 < 110 < 110 < 110 < 110 < 110 < 110 < 110 Hexane ‐‐‐‐‐‐‐‐‐‐‐Isobutane ‐‐‐‐‐‐‐‐‐‐‐Isopropyl Alcohol (2‐Propanol) ‐‐‐‐‐‐‐‐‐‐‐ Isopropylbenzene (Cumene) ‐‐‐‐‐‐‐‐‐‐‐
m,p‐Xylenes < 44 190 < 44 88 < 44 < 44 < 44 < 44 < 44 < 44 < 44 Methyl Tert Butyl Ether (MTBE) ‐‐‐‐‐‐‐‐‐‐‐
Methylene chloride (Dichloromethane) < 35 < 35 < 35 < 35 < 35 < 35 < 35 < 35 < 35 < 35 < 35 Naphthalene ‐‐‐‐‐‐‐‐‐‐‐n‐Butylbenzene ‐‐‐‐‐‐‐‐‐‐‐
N‐Heptane ‐‐‐‐‐‐‐‐‐‐‐
n‐Propylbenzene ‐‐‐‐‐‐‐‐‐‐‐
o‐Xylene < 22 53 < 22 31 < 22 < 22 < 22 < 22 < 22 < 22 < 22 Propylene (Propene) ‐‐‐‐‐‐‐‐‐‐‐
Styrene < 43 < 43 110 < 43 52 52 92 66 53 74 65
tert‐Butylbenzene ‐‐‐‐‐‐‐‐‐‐‐
Tetrachloroethene 210 220 < 34 2200 80 < 34 < 34 < 34 < 34 < 34 < 34 Tetrahydrofuran ‐‐‐‐‐‐‐‐‐‐‐Toluene < 38 180 44 46 < 38 < 38 < 38 < 38 < 38 < 38 < 38 trans‐1,2‐Dichloroethene < 40 < 40 < 40 < 40 < 40 < 40 < 40 < 40 < 40 < 40 < 40 trans‐1,3‐Dichloropropene < 46 < 46 < 46 < 46 < 46 < 46 < 46 < 46 < 46 < 46 < 46 Trichloroethene 7500 < 27 < 27 7800 130 11000 120 < 27 < 27 < 27 < 27 Trichlorofluoromethane (CFC‐11) < 56 < 56 < 56 < 56 < 56 < 56 < 56 < 56 < 56 < 56 < 56 Trifluorotrichloroethane (Freon 113) < 77 < 77 < 77 < 77 < 77 < 77 < 77 < 77 < 77 < 77 < 77 Vinyl acetate ‐‐‐‐‐‐‐‐‐‐‐
Vinyl Bromide (Bromoethene) ‐‐‐‐‐‐‐‐‐‐‐
Vinyl chloride < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 < 13 Notes:

Volatile Organic Compounds (VOCs) analyzed by EPA Method TO‐15.

BOLD = concentration detected at or above reported detection limit. < = analyte not detected above the indicated reporting limit. ‐ = not analyzed or not applicable.
µg/m3 = micrograms per cubic meter.

HALEY & ALDRICH, INC.
2022_0608_HAI_T08_sublsab_B29.xlsx JULY 2022
TABLE 8
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SUB‐SLAB SOIL VAPOR, BUILDING 29 EXPOSURE AREA ROHR INC. ‐ PARCEL ACHULA VISTA, CALIFORNIA

LocationSample Name
Sample Date
Sample Depth (bgs)
Volatile Organic Compounds (µg/m3)
1,1,1,2‐Tetrachloroethane
1,1,1‐Trichloroethane1,1,2,2‐Tetrachloroethane
1,1,2‐Trichloroethane1,1‐Dichloroethane1,1‐Dichloroethene1,1‐Dichloropropene1,1‐Difluoroethane1,2,3‐Trichlorobenzene1,2,3‐Trichloropropane1,2,4‐Trichlorobenzene1,2,4‐Trimethylbenzene1,2‐Dibromo‐3‐chloropropane (DBCP) 1,2‐Dibromoethane (Ethylene Dibromide)
1,2‐Dichlorobenzene
1,2‐Dichloroethane
1,2‐Dichloropropane1,2‐Dichlorotetrafluoroethane (CFC 114) 1,3,5‐Trimethylbenzene
1,3‐Butadiene1,3‐Dichlorobenzene
1,3‐Dichloropropane
1,4‐Dichlorobenzene
1,4‐Dioxane2,2,4‐Trimethylpentane2,2‐Dichloropropane2‐Butanone (Methyl Ethyl Ketone) 2‐Chlorotoluene2‐Hexanone (Methyl Butyl Ketone)
2‐Phenylbutane (sec‐Butylbenzene)
4‐Chlorotoluene4‐Ethyltoluene (1‐Ethyl‐4‐Methylbenzene) 4‐Methyl‐2‐Pentanone (Methyl Isobutyl Ketone)
AcetoneAllyl chloride
BenzeneBenzyl Chloride (alpha‐Chlorotoluene)
BromobenzeneBromodichloromethaneBromoformBromomethane (Methyl Bromide) Carbon disulfide
Carbon tetrachloride
ChlorobenzeneChlorobromomethaneChloroethane
B29‐V15 B29‐V16 B29‐V17 B29‐V18 B29‐V18 B29‐V19 DGA‐003 DGA‐004 DGA‐007 DGA‐008 DGA‐009 B29‐V15‐1' B29‐V16‐1' B29‐V17‐1' B29‐V18‐1' B29‐V18‐1' Rep B29‐V19‐1' DGA‐003‐2‐SG DGA‐004‐1‐SG DGA‐007‐2‐SG DGA‐008‐2‐SG DGA‐009‐2‐SG 05/22/2018 05/22/2018 05/22/2018 05/22/2018 05/22/2018 05/22/2018 03/08/2022 03/08/2022 03/10/2022 03/08/2022 03/09/2022 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 2 (ft) 1 (ft) 2 (ft) 2 (ft) 2 (ft) < 70 < 70 < 70 < 70 < 70 < 70 < 100 < 100 < 100 < 100 < 100 < 28 790 < 28 < 28 < 28 480 < 100 2000 3300 < 100 < 100 < 70 < 70 < 70 < 70 < 70 < 70 < 100 < 100 < 100 < 100 < 100 < 55 < 55 < 55 < 55 < 55 < 55 < 100 < 100 < 100 < 100 < 100 < 41 < 41 < 41 < 41 < 41 53 < 100 430 < 100 < 100 120
< 20 < 20 < 20 < 20 < 20 < 20 < 100 < 100 150 < 100 < 100 ‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100
< 27 < 27 < 27 < 27 < 27 < 27 < 100 < 100 < 100 110 < 100 ‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100
‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100
< 75 < 75 < 75 < 75 < 75 < 75 < 100 < 100 < 100 < 100 < 100 < 50 < 50 < 50 < 50 < 50 < 50 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐ < 1000 < 1000 < 1000 < 1000 < 1000
< 39 < 39 < 39 < 39 < 39 < 39 < 100 < 100 < 100 < 100 < 100 < 61 < 61 < 61 < 61 < 61 < 61 < 100 < 100 < 100 < 100 < 100 < 21 < 21 < 21 < 21 < 21 < 21 < 20 < 20 < 20 < 20 < 20
< 47 < 47 < 47 < 47 < 47 < 47 < 100 < 100 < 100 < 100 < 100 < 71 < 71 < 71 < 71 < 71 < 71 ‐‐‐‐‐
< 50 < 50 < 50 < 50 < 50 < 50 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐
< 61 < 61 < 61 < 61 < 61 < 61 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100
< 61 < 61 < 61 < 61 < 61 < 61 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100 < 60 < 60 < 60 < 60 < 60 < 60 ‐‐‐‐‐
‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100
< 41 < 41 < 41 < 41 < 41 < 41 ‐‐‐‐‐
‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100
‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100
< 50 < 50 < 50 < 50 < 50 < 50 ‐‐‐‐‐
< 41 < 41 < 41 < 41 < 41 < 41 ‐‐‐‐‐
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐
< 16 < 16 < 16 < 16 < 16 < 16 20 24 36 < 20 34
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100
< 68 < 68 < 68 < 68 < 68 < 68 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 39 < 39 < 39 < 39 < 39 < 39 < 100 < 100 < 100 < 100 < 100 < 32 < 32 < 32 < 32 < 32 < 32 ‐‐‐‐‐
< 13 < 13 < 13 < 13 < 13 < 13 < 20 < 20 < 20 < 20 < 20
< 23 < 23 < 23 < 23 < 23 < 23 < 20 < 20 < 20 < 20 < 20
‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100
< 27 < 27 < 27 < 27 < 27 < 27 < 100 < 100 < 100 < 100 < 100 HALEY & ALDRICH, INC.
2022_0608_HAI_T08_sublsab_B29.xlsx JULY 2022
TABLE 8
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SUB‐SLAB SOIL VAPOR, BUILDING 29 EXPOSURE AREA ROHR INC. ‐ PARCEL ACHULA VISTA, CALIFORNIA

LocationSample Name
Sample Date
Sample Depth (bgs)
Volatile Organic Compounds (µg/m3)
Chloroform (Trichloromethane)
Chloromethane (Methyl Chloride)
cis‐1,2‐Dichloroethenecis‐1,3‐DichloropropeneCyclohexaneCymene (p‐Isopropyltoluene)DibromochloromethaneDibromomethaneDichlorodifluoromethane (CFC‐12) Ethyl acetate
EthylbenzeneHexachlorobutadieneHexaneIsobutaneIsopropyl Alcohol (2‐Propanol)Isopropylbenzene (Cumene) m,p‐Xylenes
Methyl Tert Butyl Ether (MTBE)
Methylene chloride (Dichloromethane)Naphthalenen‐ButylbenzeneN‐Heptane n‐Propylbenzene
o‐XylenePropylene (Propene)
Styrenetert‐Butylbenzene
TetrachloroetheneTetrahydrofuranToluenetrans‐1,2‐Dichloroethene trans‐1,3‐Dichloropropene
TrichloroetheneTrichlorofluoromethane (CFC‐11)
Trifluorotrichloroethane (Freon 113)
Vinyl acetateVinyl Bromide (Bromoethene)
Vinyl chlorideNotes:

Volatile Organic Compounds (VOCs) analyzed by EPA Method TO‐15.

BOLD = concentration detected at or above reported detection limit.< = analyte not detected above the indicated reporting limit. ‐ = not analyzed or not applicable.
µg/m3 = micrograms per cubic meter.

B29‐V15 B29‐V16 B29‐V17 B29‐V18 B29‐V18 B29‐V19 DGA‐003 DGA‐004 DGA‐007 DGA‐008 DGA‐009 B29‐V15‐1' B29‐V16‐1' B29‐V17‐1' B29‐V18‐1' B29‐V18‐1' Rep B29‐V19‐1' DGA‐003‐2‐SG DGA‐004‐1‐SG DGA‐007‐2‐SG DGA‐008‐2‐SG DGA‐009‐2‐SG 05/22/2018 05/22/2018 05/22/2018 05/22/2018 05/22/2018 05/22/2018 03/08/2022 03/08/2022 03/10/2022 03/08/2022 03/09/2022 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 1 (ft) 2 (ft) 1 (ft) 2 (ft) 2 (ft) 2 (ft) < 25 < 25 < 25 < 25 < 25 < 25 < 20 80 120 < 20 < 20
< 21 < 21 < 21 < 21 < 21 < 21 < 100 < 100 < 100 < 100 < 100 < 40 < 40 < 40 < 40 < 40 1300 < 100 5800 < 100 < 100 17000 < 46 < 46 < 46 < 46 < 46 < 46 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100
< 86 < 86 < 86 < 86 < 86 < 86 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100
< 50 < 50 < 50 < 50 < 50 < 50 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐
< 22 < 22 < 22 < 22 < 22 < 22 < 100 < 100 < 100 < 100 < 100 < 110 < 110 < 110 < 110 < 110 < 110 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100 < 44 < 44 < 44 < 44 < 44 < 44 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100
< 35 < 35 < 35 < 35 < 35 < 35 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐ < 20 < 20 < 20 < 20 < 20
‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100
< 22 < 22 < 22 < 22 < 22 < 22 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐
64 < 43 110 48 62 99 < 100 < 100 < 100 < 100 < 100
‐‐‐‐‐‐ < 100 < 100 < 100 < 100 < 100
< 34 340 < 34 57 54 < 34 < 20 100 20 < 20 66
‐‐‐‐‐‐‐‐‐‐‐
< 38 < 38 < 38 < 38 < 38 < 38 < 200 < 200 < 200 < 200 < 200 < 40 < 40 < 40 < 40 < 40 150 < 100 340 < 100 < 100 470
< 46 < 46 < 46 < 46 < 46 < 46 < 100 < 100 < 100 < 100 < 100 < 27 16000 43 42 < 27 9800 260 18000 5600 1300 2300
60 < 56 < 56 < 56 < 56 < 56 < 100 < 100 < 100 < 100 < 100 < 77 320 < 77 < 77 < 77 1900 160 1600 2600 < 100 < 100
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐
< 13 < 13 < 13 < 13 < 13 < 13 < 10 < 10 < 10 < 10 36
HALEY & ALDRICH, INC.
2022_0608_HAI_T08_sublsab_B29.xlsx JULY 2022
TABLE 8
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SUB‐SLAB SOIL VAPOR, BUILDING 29 EXPOSURE AREA ROHR INC. ‐ PARCEL ACHULA VISTA, CALIFORNIA

LocationSample Name
Sample Date
Sample Depth (bgs)
Volatile Organic Compounds (µg/m3)
1,1,1,2‐Tetrachloroethane
1,1,1‐Trichloroethane1,1,2,2‐Tetrachloroethane
1,1,2‐Trichloroethane1,1‐Dichloroethane1,1‐Dichloroethene1,1‐Dichloropropene1,1‐Difluoroethane1,2,3‐Trichlorobenzene1,2,3‐Trichloropropane1,2,4‐Trichlorobenzene1,2,4‐Trimethylbenzene1,2‐Dibromo‐3‐chloropropane (DBCP) 1,2‐Dibromoethane (Ethylene Dibromide)
1,2‐Dichlorobenzene
1,2‐Dichloroethane
1,2‐Dichloropropane1,2‐Dichlorotetrafluoroethane (CFC 114) 1,3,5‐Trimethylbenzene
1,3‐Butadiene1,3‐Dichlorobenzene
1,3‐Dichloropropane
1,4‐Dichlorobenzene
1,4‐Dioxane2,2,4‐Trimethylpentane2,2‐Dichloropropane2‐Butanone (Methyl Ethyl Ketone) 2‐Chlorotoluene2‐Hexanone (Methyl Butyl Ketone)
2‐Phenylbutane (sec‐Butylbenzene)
4‐Chlorotoluene4‐Ethyltoluene (1‐Ethyl‐4‐Methylbenzene) 4‐Methyl‐2‐Pentanone (Methyl Isobutyl Ketone)
AcetoneAllyl chloride
BenzeneBenzyl Chloride (alpha‐Chlorotoluene)
BromobenzeneBromodichloromethaneBromoformBromomethane (Methyl Bromide) Carbon disulfide
Carbon tetrachloride
ChlorobenzeneChlorobromomethaneChloroethane
DGA‐009 DGA‐011 DGA‐013 DGA‐014 DGA‐015 DGA‐016 DGA‐017 DGA‐017 DGA‐019 DGA‐021 DGA‐022 DGA‐009‐2‐SG REP DGA‐011‐2‐SG DGA‐013‐1‐SG DGA‐014‐2.5‐SG DGA‐015‐2‐SG DGA‐016‐2‐SG DGA‐017‐1‐SG DGA‐017‐1‐SG REP DGA‐019‐2‐SG DGA‐021‐1‐SG DGA‐022‐2‐SG 03/09/2022 03/09/2022 03/08/2022 03/09/2022 03/09/2022 03/10/2022 03/08/2022 03/08/2022 03/10/2022 03/08/2022 03/10/2022 2 (ft) 2 (ft) 1 (ft) 2.5 (ft) 2 (ft) 2 (ft) 1 (ft) 1 (ft) 2 (ft) 1 (ft) 2 (ft) < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 150 140 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 1000 < 1000 < 1000 < 1000 < 1000 < 1000 < 1000 < 1000 < 1000 < 1000 < 1000 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20
< 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐
< 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐
< 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐
< 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐
< 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐
< 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐
28 < 20 < 20 < 20 < 20 56 < 20 < 20 26 < 20 30
‐‐‐‐‐‐‐‐‐‐‐
< 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐
< 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20
< 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20
< 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 HALEY & ALDRICH, INC.
2022_0608_HAI_T08_sublsab_B29.xlsx JULY 2022
TABLE 8
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SUB‐SLAB SOIL VAPOR, BUILDING 29 EXPOSURE AREA ROHR INC. ‐ PARCEL ACHULA VISTA, CALIFORNIA

LocationSample Name
Sample Date
Sample Depth (bgs)
Volatile Organic Compounds (µg/m3)
Chloroform (Trichloromethane)
Chloromethane (Methyl Chloride)
cis‐1,2‐Dichloroethenecis‐1,3‐DichloropropeneCyclohexaneCymene (p‐Isopropyltoluene)DibromochloromethaneDibromomethaneDichlorodifluoromethane (CFC‐12) Ethyl acetate
EthylbenzeneHexachlorobutadieneHexaneIsobutaneIsopropyl Alcohol (2‐Propanol)Isopropylbenzene (Cumene) m,p‐Xylenes
Methyl Tert Butyl Ether (MTBE)
Methylene chloride (Dichloromethane)Naphthalenen‐ButylbenzeneN‐Heptane n‐Propylbenzene
o‐XylenePropylene (Propene)
Styrenetert‐Butylbenzene
TetrachloroetheneTetrahydrofuranToluenetrans‐1,2‐Dichloroethene trans‐1,3‐Dichloropropene
TrichloroetheneTrichlorofluoromethane (CFC‐11)
Trifluorotrichloroethane (Freon 113)
Vinyl acetateVinyl Bromide (Bromoethene)
Vinyl chlorideNotes:

Volatile Organic Compounds (VOCs) analyzed by EPA Method TO‐15.

BOLD = concentration detected at or above reported detection limit.< = analyte not detected above the indicated reporting limit. ‐ = not analyzed or not applicable.
µg/m3 = micrograms per cubic meter.

DGA‐009 DGA‐011 DGA‐013 DGA‐014 DGA‐015 DGA‐016 DGA‐017 DGA‐017 DGA‐019 DGA‐021 DGA‐022 DGA‐009‐2‐SG REP DGA‐011‐2‐SG DGA‐013‐1‐SG DGA‐014‐2.5‐SG DGA‐015‐2‐SG DGA‐016‐2‐SG DGA‐017‐1‐SG DGA‐017‐1‐SG REP DGA‐019‐2‐SG DGA‐021‐1‐SG DGA‐022‐2‐SG 03/09/2022 03/09/2022 03/08/2022 03/09/2022 03/09/2022 03/10/2022 03/08/2022 03/08/2022 03/10/2022 03/08/2022 03/10/2022 2 (ft) 2 (ft) 1 (ft) 2.5 (ft) 2 (ft) 2 (ft) 1 (ft) 1 (ft) 2 (ft) 1 (ft) 2 (ft) < 20 < 20 < 20 < 20 < 20 61 140 120 30 < 20 190
< 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 14000 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐
< 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐
< 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐
< 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20 < 20
< 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐
< 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐
< 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 56 35 180 260 < 20 < 20 < 20 < 20 < 20 560 98
‐‐‐‐‐‐‐‐‐‐‐
< 200 < 200 < 200 < 200 < 200 200 < 200 < 200 < 200 < 200 < 200 390 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 1900 860 54 < 20 < 20 4900 2700 2700 2600 770 860
< 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 < 100 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐
30 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10 < 10
HALEY & ALDRICH, INC.
2022_0608_HAI_T08_sublsab_B29.xlsx JULY 2022
TABLE 8
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SUB‐SLAB SOIL VAPOR, BUILDING 29 EXPOSURE AREA ROHR INC. ‐ PARCEL ACHULA VISTA, CALIFORNIA

LocationSample Name
Sample Date
Sample Depth (bgs)
Volatile Organic Compounds (µg/m3)
1,1,1,2‐Tetrachloroethane
1,1,1‐Trichloroethane1,1,2,2‐Tetrachloroethane
1,1,2‐Trichloroethane1,1‐Dichloroethane1,1‐Dichloroethene1,1‐Dichloropropene1,1‐Difluoroethane1,2,3‐Trichlorobenzene1,2,3‐Trichloropropane1,2,4‐Trichlorobenzene1,2,4‐Trimethylbenzene1,2‐Dibromo‐3‐chloropropane (DBCP) 1,2‐Dibromoethane (Ethylene Dibromide)
1,2‐Dichlorobenzene
1,2‐Dichloroethane
1,2‐Dichloropropane1,2‐Dichlorotetrafluoroethane (CFC 114) 1,3,5‐Trimethylbenzene
1,3‐Butadiene1,3‐Dichlorobenzene
1,3‐Dichloropropane
1,4‐Dichlorobenzene
1,4‐Dioxane2,2,4‐Trimethylpentane2,2‐Dichloropropane2‐Butanone (Methyl Ethyl Ketone) 2‐Chlorotoluene2‐Hexanone (Methyl Butyl Ketone)
2‐Phenylbutane (sec‐Butylbenzene)
4‐Chlorotoluene4‐Ethyltoluene (1‐Ethyl‐4‐Methylbenzene) 4‐Methyl‐2‐Pentanone (Methyl Isobutyl Ketone)
AcetoneAllyl chloride
BenzeneBenzyl Chloride (alpha‐Chlorotoluene)
BromobenzeneBromodichloromethaneBromoformBromomethane (Methyl Bromide) Carbon disulfide
Carbon tetrachloride
ChlorobenzeneChlorobromomethaneChloroethane
PW‐01B PW‐06 PW‐07 PW‐08 PW‐09 PW‐11 PW‐12 PW‐13 PW‐14 PW‐14 PW‐15 PW01B‐SV‐5 PW06‐SV‐3.5 PW07‐SV‐4 PW08‐SV‐5 PW09‐SV‐4.5 PW11‐SV‐3 PW12‐SV‐3 PW13‐SV‐4 PW14‐SV‐4 PW14‐SV‐4DUP PW15‐SV‐4.5 07/31/2020 07/31/2020 07/31/2020 07/31/2020 07/30/2020 07/30/2020 07/30/2020 07/30/2020 07/30/2020 07/30/2020 07/30/2020 5 ‐ 5 (ft) 3.5 ‐ 3.5 (ft) 4 ‐ 4 (ft) 5 ‐ 5 (ft) 4.5 ‐ 4.5 (ft) 3 ‐ 3 (ft) 3 ‐ 3 (ft) 4 ‐ 4 (ft) 4 ‐ 4 (ft) 4 ‐ 4 (ft) 4.5 ‐ 4.5 (ft) ‐‐‐‐‐‐‐‐‐‐‐
< 24 < 600 38 < 24 120 < 3< 3 12 < 1200 < 2400 1100
< 28 < 700 < 28 < 28 < 140 < 3.5 < 3.5 < 3.5 < 1400 < 2800 < 350 < 24 < 600 < 24 < 24 < 120 < 3< 3< 3< 1200 < 2400 < 300 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐
< 24 < 600 < 24 < 24 < 120 < 3< 3< 3< 1200 < 2400 < 300 < 32 < 800 < 32 < 32 < 160 < 4< 4< 4< 1600 < 3200 < 400 610 600 120 530 140 110 400 500 < 1000 < 2000 < 250
‐‐‐‐‐‐‐‐‐‐‐
< 32 < 800 < 32 < 32 < 160 < 4< 4< 4< 1600 < 3200 < 400 < 24 < 600 < 24 < 24 < 120 < 3< 3< 3< 1200 < 2400 < 300 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 < 28 < 700 < 28 < 28 < 140 < 3.5 < 3.5 < 3.5 < 1400 < 2800 < 350 220 < 500 48 270 < 100 67 180 180 < 1000 < 2000 < 250
< 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 < 24 < 600 < 24 < 24 < 120 < 3< 3< 3< 1200 < 2400 < 300 ‐‐‐‐‐‐‐‐‐‐‐
< 24 < 600 < 24 < 24 < 120 < 3< 3< 3< 1200 < 2400 < 300 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 < 20 < 500 < 20 < 20 < 100 < 2.5 12 3.9 < 1000 < 2000 < 250 ‐‐‐‐‐‐‐‐‐‐‐
< 80 < 2000 < 80 < 80 < 400 < 10 < 10 < 10 < 4000 < 8000 < 1000 ‐‐‐‐‐‐‐‐‐‐‐
< 80 < 2000 < 80 < 80 < 400 < 10 < 10 < 10 < 4000 < 8000 < 1000 < 24 < 600 < 24 < 24 < 120 < 3 8.1 < 3< 1200 < 2400 < 300 ‐‐‐‐‐‐‐‐‐‐‐
130 < 500 22 160 < 100 29 110 94 < 1000 < 2000 < 250
< 80 < 2000 < 80 < 80 < 400 < 10 < 10 < 10 < 4000 < 8000 < 1000 < 80 < 2000 < 80 < 80 < 400 51 59 43 < 4000 < 8000 < 1000 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 < 20 < 500 < 20 75 < 100 10 36 8 < 1000 < 2000 < 250
< 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 9.8 < 1000 < 2000 < 250 ‐‐‐‐‐‐‐‐‐‐‐
< 24 < 600 < 24 < 24 140 16 17 < 3< 1200 < 2400 < 300
< 40 < 1000 < 40 < 40 < 200 < 5< 5< 5< 2000 < 4000 < 500 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 < 28 < 700 < 28 < 28 < 140 < 3.5 < 3.5 < 3.5 < 1400 < 2800 < 350 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 ‐‐‐‐‐‐‐‐‐‐‐
< 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 HALEY & ALDRICH, INC.
2022_0608_HAI_T08_sublsab_B29.xlsx JULY 2022
TABLE 8
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SUB‐SLAB SOIL VAPOR, BUILDING 29 EXPOSURE AREA ROHR INC. ‐ PARCEL ACHULA VISTA, CALIFORNIA

LocationSample Name
Sample Date
Sample Depth (bgs)
Volatile Organic Compounds (µg/m3)
Chloroform (Trichloromethane)
Chloromethane (Methyl Chloride)
cis‐1,2‐Dichloroethenecis‐1,3‐DichloropropeneCyclohexaneCymene (p‐Isopropyltoluene)DibromochloromethaneDibromomethaneDichlorodifluoromethane (CFC‐12) Ethyl acetate
EthylbenzeneHexachlorobutadieneHexaneIsobutaneIsopropyl Alcohol (2‐Propanol)Isopropylbenzene (Cumene) m,p‐Xylenes
Methyl Tert Butyl Ether (MTBE)
Methylene chloride (Dichloromethane)Naphthalenen‐ButylbenzeneN‐Heptane n‐Propylbenzene
o‐XylenePropylene (Propene)
Styrenetert‐Butylbenzene
TetrachloroetheneTetrahydrofuranToluenetrans‐1,2‐Dichloroethene trans‐1,3‐Dichloropropene
TrichloroetheneTrichlorofluoromethane (CFC‐11)
Trifluorotrichloroethane (Freon 113)
Vinyl acetateVinyl Bromide (Bromoethene)
Vinyl chlorideNotes:

Volatile Organic Compounds (VOCs) analyzed by EPA Method TO‐15.

BOLD = concentration detected at or above reported detection limit.< = analyte not detected above the indicated reporting limit. ‐ = not analyzed or not applicable.
µg/m3 = micrograms per cubic meter.

PW‐01B PW‐06 PW‐07 PW‐08 PW‐09 PW‐11 PW‐12 PW‐13 PW‐14 PW‐14 PW‐15 PW01B‐SV‐5 PW06‐SV‐3.5 PW07‐SV‐4 PW08‐SV‐5 PW09‐SV‐4.5 PW11‐SV‐3 PW12‐SV‐3 PW13‐SV‐4 PW14‐SV‐4 PW14‐SV‐4DUP PW15‐SV‐4.5 07/31/2020 07/31/2020 07/31/2020 07/31/2020 07/30/2020 07/30/2020 07/30/2020 07/30/2020 07/30/2020 07/30/2020 07/30/2020 5 ‐ 5 (ft) 3.5 ‐ 3.5 (ft) 4 ‐ 4 (ft) 5 ‐ 5 (ft) 4.5 ‐ 4.5 (ft) 3 ‐ 3 (ft) 3 ‐ 3 (ft) 4 ‐ 4 (ft) 4 ‐ 4 (ft) 4 ‐ 4 (ft) 4.5 ‐ 4.5 (ft) < 20 1600 160 32 410 14 20 26 < 1000 < 2000 < 250
< 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 3.8 4300 4400 < 250 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 < 20 < 500 < 20 < 20 < 100 < 2.5 3.6 < 2.5 < 1000 < 2000 < 250 79 < 600 < 24 80 < 120 8.8 63 53 < 1200 < 2400 < 300
< 20 < 500 < 20 < 20 < 100 12 9.5 < 2.5 < 1000 < 2000 < 250 ‐‐‐‐‐‐‐‐‐‐‐
< 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 17 < 1000 < 2000 < 250 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 150 < 500 28 340 < 100 50 150 81 < 1000 < 2000 < 250
< 48 < 1200 < 48 < 48 < 240 < 6< 6< 6< 2400 < 4800 < 600 < 20 < 500 < 20 < 20 < 100 5.9 11 3.6 < 1000 < 2000 < 250 < 20 < 500 < 20 < 20 < 100 5.1 < 2.5 < 2.5 < 1000 < 2000 < 250 < 80 < 2000 < 80 < 80 < 400 < 10 < 10 < 10 < 4000 < 8000 < 1000 < 20 < 500 < 20 33 < 100 5.9 20 11 < 1000 < 2000 < 250
670 1100 130 1300 200 160 710 400 < 2000 < 4000 < 500
< 80 < 2000 < 80 < 80 < 400 < 10 < 10 < 10 < 4000 < 8000 < 1000 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 ‐‐‐‐‐‐‐‐‐‐‐
< 20 < 500 < 20 < 20 < 100 4.9 12 4.2 < 1000 < 2000 < 250 80 < 500 < 20 120 < 100 19 87 59 < 1000 < 2000 < 250
240 < 500 40 360 < 100 70 200 140 < 1000 < 2000 < 250
< 20 < 500 < 20 < 20 < 100 7.5 30 < 2.5 < 1000 < 2000 < 250 < 20 < 500 < 20 < 20 < 100 14 19 < 2.5 < 1000 < 2000 < 250 ‐‐‐‐‐‐‐‐‐‐‐
< 28 < 700 330 96 < 140 16 1500 4.7 < 1400 < 2800 < 350 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 230 510 51 670 150 89 350 98 < 1000 < 2000 < 250
< 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 140 160000 7600 54 14000 5.9 35 91 64000 64000 13000
< 24 < 600 < 24 < 24 < 120 < 3< 3 94 < 1200 < 2400 < 300 < 32 < 800 < 32 < 32 < 160 5.6 < 4< 4< 1600 < 3200 740
< 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 < 20 < 500 < 20 < 20 < 100 < 2.5 < 2.5 < 2.5 < 1000 < 2000 < 250 HALEY & ALDRICH, INC.
2022_0608_HAI_T08_sublsab_B29.xlsx JULY 2022
TABLE 8
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SUB‐SLAB SOIL VAPOR, BUILDING 29 EXPOSURE AREA ROHR INC. ‐ PARCEL ACHULA VISTA, CALIFORNIA

LocationSample Name
Sample Date
Sample Depth (bgs)
Volatile Organic Compounds (µg/m3)
1,1,1,2‐Tetrachloroethane
1,1,1‐Trichloroethane1,1,2,2‐Tetrachloroethane
1,1,2‐Trichloroethane1,1‐Dichloroethane1,1‐Dichloroethene1,1‐Dichloropropene1,1‐Difluoroethane1,2,3‐Trichlorobenzene1,2,3‐Trichloropropane1,2,4‐Trichlorobenzene1,2,4‐Trimethylbenzene1,2‐Dibromo‐3‐chloropropane (DBCP) 1,2‐Dibromoethane (Ethylene Dibromide)
1,2‐Dichlorobenzene
1,2‐Dichloroethane
1,2‐Dichloropropane1,2‐Dichlorotetrafluoroethane (CFC 114) 1,3,5‐Trimethylbenzene
1,3‐Butadiene1,3‐Dichlorobenzene
1,3‐Dichloropropane
1,4‐Dichlorobenzene
1,4‐Dioxane2,2,4‐Trimethylpentane2,2‐Dichloropropane2‐Butanone (Methyl Ethyl Ketone) 2‐Chlorotoluene2‐Hexanone (Methyl Butyl Ketone)
2‐Phenylbutane (sec‐Butylbenzene)
4‐Chlorotoluene4‐Ethyltoluene (1‐Ethyl‐4‐Methylbenzene) 4‐Methyl‐2‐Pentanone (Methyl Isobutyl Ketone)
AcetoneAllyl chloride
BenzeneBenzyl Chloride (alpha‐Chlorotoluene)
BromobenzeneBromodichloromethaneBromoformBromomethane (Methyl Bromide) Carbon disulfide
Carbon tetrachloride
ChlorobenzeneChlorobromomethaneChloroethane
PW‐16
PW16‐SV‐5
07/30/2020
5 ‐ 5 (ft)
‐
35 < 3.5
< 3
< 2.5< 2.5
‐‐‐
< 3
< 4
490
‐
< 4
< 3
< 2.5< 2.5< 3.5
180
< 2.5
< 3
‐
< 3
< 2.5< 2.5
‐
< 10
‐
< 10

4.5 ‐
55 < 10< 10
< 2.5

7.6 < 2.5
‐
< 3
< 5
< 2.5
< 2.5< 3.5< 2.5
‐
< 2.5
HALEY & ALDRICH, INC.
2022_0608_HAI_T08_sublsab_B29.xlsx JULY 2022
TABLE 8
SUMMARY OF EXPOSURE POINT CONCENTRATIONS IN SUB‐SLAB SOIL VAPOR, BUILDING 29 EXPOSURE AREA ROHR INC. ‐ PARCEL ACHULA VISTA, CALIFORNIA

LocationSample Name
Sample Date
Sample Depth (bgs)
Volatile Organic Compounds (µg/m3)
Chloroform (Trichloromethane)
Chloromethane (Methyl Chloride)
cis‐1,2‐Dichloroethenecis‐1,3‐DichloropropeneCyclohexaneCymene (p‐Isopropyltoluene)DibromochloromethaneDibromomethaneDichlorodifluoromethane (CFC‐12) Ethyl acetate
EthylbenzeneHexachlorobutadieneHexaneIsobutaneIsopropyl Alcohol (2‐Propanol)Isopropylbenzene (Cumene) m,p‐Xylenes
Methyl Tert Butyl Ether (MTBE)
Methylene chloride (Dichloromethane)Naphthalenen‐ButylbenzeneN‐Heptane n‐Propylbenzene
o‐XylenePropylene (Propene)
Styrenetert‐Butylbenzene
TetrachloroetheneTetrahydrofuranToluenetrans‐1,2‐Dichloroethene trans‐1,3‐Dichloropropene
TrichloroetheneTrichlorofluoromethane (CFC‐11)
Trifluorotrichloroethane (Freon 113)
Vinyl acetateVinyl Bromide (Bromoethene)
Vinyl chlorideNotes:

Volatile Organic Compounds (VOCs) analyzed by EPA Method TO‐15.

BOLD = concentration detected at or above reported detection limit.< = analyte not detected above the indicated reporting limit. ‐ = not analyzed or not applicable.
µg/m3 = micrograms per cubic meter.

PW‐16
PW16‐SV‐5
07/30/2020
5 ‐ 5 (ft)

5.8 < 2.5< 2.5< 2.5< 2.5
27 < 2.5
‐
< 2.5< 2.5
61 < 6
< 2.5< 2.5
< 10

7.7 310
< 10
< 2.5

6.3 ‐
< 2.5
3699
< 2.5
10 ‐
16 < 2.5
120
< 2.5
< 2.5
25 6.7
72 < 2.5< 2.5< 2.5
HALEY & ALDRICH, INC.
2022_0608_HAI_T08_sublsab_B29.xlsx JULY 2022
TABLE 9

TOXICITY VALUES FOR CHEMICALS DETECTED IN SOIL SAMPLES
ROHR INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

CAS No Chemical Name CA Chronic RfCi (inh) mg/m3 Ref. CA Chronic RfDo (oral) (mg/kg‐day) Ref. CA SFo (oral) (mg/kg‐day)‐1 Ref. CA IUR (inh) (µg/m3)‐1 Ref. 7440‐38‐2 Arsenic 1.5E‐05 C 3.5E‐06 C 9.5E+00 C 4.3E‐03 I 7440‐39‐3 Barium 5.0E‐04 H 2.0E‐01 I na I na I
7440‐41‐7 Beryllium 7.0E‐06 C 2.0E‐04 C na I 2.4E‐03 I
7440‐50‐8 Copper na I 4.0E‐02 H na I na I
7439‐92‐1 Lead na I na I na I na I7440‐66‐6 Zinc na I 3.0E‐01 I na I na I 11097‐69‐1 Aroclor‐1254 8.0E‐05 I 2.0E‐05 I 2.0E+00 I 5.7E‐04 I 72‐54‐8 DDD na I 3.0E‐05 sP 2.4E‐01 I 6.9E‐05 C
72‐55‐9 DDE 1.2E‐03 sP 3.0E‐04 sP 3.4E‐01 C 9.7E‐05 C
50‐29‐3 DDT na I 5.0E‐04 I 3.4E‐01 I 9.7E‐05 I
12789‐03‐6 Chlordane 7.0E‐04 I 5.0E‐04 I 3.5E‐01 I 1.0E‐04 I 1024‐57‐3 Heptachlor Epoxide 5.2E‐05 I 1.3E‐05 I 9.1E+00 I 2.6E‐03 I 83‐32‐9 Acenaphthene 2.4E‐01 I 6.0E‐02 I na I na I
208‐96‐8 Acenaphthylene (Surrogate = na I 6.0E‐02 S na I na I 120‐12‐7 Anthracene 1.2E+00 I 3.0E‐01 I na I na I
56‐55‐3 Benz[a]anthracene na I na I 1.0E‐01 R 1.1E‐04 C 50‐32‐8 Benzo[a]pyrene 2.0E‐06 I 3.0E‐04 I 1.0E+00 I 1.1E‐03 C 205‐99‐2 Benzo[b]fluoranthene na I na I 1.0E‐01 R 1.1E‐04 C 191‐24‐2 Benzo(g,h,i)perylene (surrogate = na I 3.0E‐02 S na I na I 207‐08‐9 Benzo[k]fluoranthene na I na I 1.0E‐02 R 1.1E‐04 C 218‐01‐9 Chrysene na I na I 1.0E‐03 R 1.1E‐05 C
53‐70‐3 Dibenz[a,h]anthracene na I na I 4.1E+00 C 1.2E‐03 C 131‐11‐3 Dimethyl Phthalate na I na I na I na I
206‐44‐0 Fluoranthene na I 4.0E‐02 I na I na I
86‐73‐7 Fluorene 1.6E‐01 I 4.0E‐02 I na I na I
193‐39‐5 Indeno[1,2,3‐cd]pyrene na I na I 1.0E‐01 R 1.1E‐04 C 85‐01‐8 Phenanthrene (surrogate = pyrene) na I 3.0E‐02 S na I na I 129‐00‐0 Pyrene 1.2E‐01 I 3.0E‐02 I na I na I
71‐55‐6 1,1,1‐Trichloroethane 1.0E+00 C 2.0E+00 I na I na I 76‐13‐1 Trifluorotrichloroethane (Freon 113) 5.0E+00 P 3.0E+01 I na I na I 75‐34‐3 1,1‐Dichloroethane 8.0E‐01 P 2.0E‐01 P 5.7E‐03 C 1.6E‐06 C 526‐73‐8 1,2,3‐Trimethylbenzene 6.0E‐02 I 1.0E‐02 I na I na I 95‐63‐6 1,2,4‐Trimethylbenzene 6.0E‐02 I 1.0E‐02 I na I na I 108‐67‐8 1,3,5‐Trimethylbenzene 6.0E‐02 I 1.0E‐02 I na I na I 78‐93‐3 Methyl Ethyl Ketone (2‐Butanone) 5.0E+00 I 6.0E‐01 I na I na I 67‐64‐1 Acetone 3.1E+01 A 9.0E‐01 I na I na I
71‐43‐2 Benzene 3.0E‐03 C 4.0E‐03 I 1.0E‐01 C 2.9E‐05 C 67‐66‐3 Chloroform 9.8E‐02 A 1.0E‐02 I 3.1E‐02 C 2.3E‐05 I HALEY & ALDRICH, INC.
2022_0608_HAI_T09_Toxicity.xlsx JULY 2022
TABLE 9

TOXICITY VALUES FOR CHEMICALS DETECTED IN SOIL SAMPLES
ROHR INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

CAS No Chemical Name CA Chronic RfCi (inh) mg/m3 Ref. CA Chronic RfDo (oral) (mg/kg‐day) Ref. CA SFo (oral) (mg/kg‐day)‐1 Ref. CA IUR (inh) (µg/m3)‐1 Ref. 156‐59‐2 cis‐1,2‐Dichloroethylene 8.0E‐03 I 2.0E‐03 I na I na I 99‐87‐6 Cymene (p‐Isopropyltoluene) na I na I na I na I 100‐41‐4 Ethylbenzene 1.0E+00 I 1.0E‐01 I 1.1E‐02 C 2.5E‐06 C 1634‐04‐4 Methyl tert‐Butyl Ether (MTBE) 3.0E+00 I na I 1.8E‐03 C 2.6E‐07 C 75‐09‐2 Methylene Chloride 4.0E‐01 C 6.00E‐03 I 2.0E‐03 I 1.0E‐06 C 179601‐23‐1 m,p‐Xylenes 1.0E‐01 I 2.0E‐01 I na I na I
91‐20‐3 Naphthalene 3.0E‐03 I 2.0E‐02 I 1.2E‐01 C 3.4E‐05 C 104‐51‐8 Butylbenzene, n‐ 2.0E‐01 P 5.0E‐02 P na I na I 95‐47‐6 o‐Xylene 1.0E‐01 I 2.0E‐01 I na I na I
100‐42‐5 Styrene 9.0E‐01 C 2.00E‐01 I na I na I
127‐18‐4 Tetrachloroethylene 4.0E‐02 I 6.0E‐03 I 5.4E‐01 C 6.1E‐06 C 108‐88‐3 Toluene 3.0E‐01 C 8.0E‐02 I na I na I
156‐60‐5 trans‐1,2‐Dichloroethylene 8.0E‐02 I 2.0E‐02 I na I na I 79‐01‐6 Trichloroethylene 2.0E‐03 I 5.0E‐04 I 4.6E‐02 I 4.1E‐06 I 75‐69‐4 Trichlorofluoromethane (CFC‐11) 1.2E+00 I 3.0E‐01 I na I na I REFERENCES:

C California Department of Toxic Substances Control “Human Health Risk Assessment (HHRA) Note, Human and Ecological Risk Office (HERO) HHRA Note Number: 10, Toxicity Criteria” prepared by the DTSC and dated February 25, 2019 I EPA's Integrated Risk Information System (IRIS).
http://www.epa.gov/iris/
A The Agency for Toxic Substances and Disease Registry (ATSDR) minimal risk levels (MRLs). http://www.atsdr.cdc.gov/
H The EPA Superfund program's Health Effects Assessment Summary (H). http://epa‐H.ornl.gov/
P The Provisional Peer Reviewed Toxicity Values (PPRTVs) derived by EPA's Superfund Health Risk Technical Support Center (STSC) for the EPA Superfund program. http://hhpprtv.ornl.gov/
sP Screening Provisional Peer Reviewed Toxicity Values (PPRTVs) derived by EPA's Superfund Health Risk Technical Support Center (STSC) for the EPA Superfund program. http://hhpprtv.ornl.gov/
R EPA Regional Screening Levels
https://www.epa.gov/risk/regional‐screening‐levels‐rsls‐generic‐tables S Surrogate
na Not Applicable
HALEY & ALDRICH, INC.
2022_0608_HAI_T09_Toxicity.xlsx JULY 2022
TABLE 10
EXPOSURE AREA‐SPECIFIC HUMAN HEALTH RISK ASSESSMENT SUMMARY ROHR INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

BUILDING 99/100 EXPOSURE AREA

RECEPTOR

PATHWAY ILCR HI
Ingestion of Soil 5E‐08 0.06
Dermal Contact with Soil 4E‐08 0.03
Inhalation of Particulates 1E‐08 0.2
Inhalation of Volatiles from Soil 0E+00 0.000005
Total 1E‐07 0.3
Ingestion of Soil 1E‐07 0.008
Dermal Contact with Soil 9E‐08 0.03
Inhalation of Particulates 2E‐10 0.0001
Inhalation of Volatiles from Soil 0E+00 0.0000004
Total 2E‐07 0.04
Inhalation of Volatiles in Indoor Air 3E‐07 0.1
Total 3E‐07 0.1
Inhalation of Volatiles in Indoor Air 3E‐07 0.1
Total 3E‐07 0.1
Inhalation of Volatiles in Indoor Air 3E‐07 0.1
Total 3E‐07 0.1
BUILDING 29 EXPOSURE AREA

RECEPTOR

PATHWAY ILCR HI
Ingestion of Soil 1E‐05 0.8
Dermal Contact with Soil 2E‐06 0.2
Inhalation of Particulates 2E‐09 0.0002
Inhalation of Volatiles from Soil 3E‐07 0.006
Total 1E‐05 1
Inhalation of Volatiles in Indoor Air 2E‐03 500
Total 2E‐03 500
Ingestion of Soil 2E‐07 0.2
Dermal Contact with Soil 1E‐07 0.2
Inhalation of Particulates 3E‐09 0.006
Inhalation of Volatiles from Soil 8E‐07 6
Total 1E‐06 6
NOTES:

HI = Hazard Index
ILCR = Incrimental Lifetime Cancer Risk
On‐Site Commercial/Industrial
Worker
On‐Site Construction Worker
On‐Site Commercial/Industrial
Worker (Future Building)
On‐Site Landscaper
On‐Site Landscaper
On‐Site Construction Worker
(Within Planned Loading Dock
Excavation Area)
On‐Site Commercial/Industrial
Worker (Existing Building 99)
On‐Site Commercial/Industrial
Worker (Existing Building 100)
HALEY & ALDRICH, INC.
2022_0608_HAI_T10_risk_summary.xls
JULY 2022
TABLE 11
HEALTH‐BASED REMEDIATION GOALS
ROHR INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

BUILDING 99/100 EXPOSURE AREA

SOIL VAPOR
(µg/m3
)
NO HEALTH‐BASED REMEDIATION GOALS NA
BUILDING 29 EXPOSURE AREA

SOIL VAPOR
(µg/m3
)
Bromodichloromethane 70
Chloroform 80
Cis‐1,2‐Dichloroethene 100
Tetrachloroethene 370
Trichloroethene 350
BUILDING 29 EXPOSURE AREA
(PLANNED LOADING DOCK EXCAVATION AREA)
SOIL
(mg/kg)
Trichloroethene 1.5
NOTES:

NA = Not Applicable
µg/m3 = micrograms per cubic meter
mg/kg = milligram per kilogram
HALEY & ALDRICH, INC.
2022_0608_HAI_T11_REM_Goals.xls JULY 2022
TABLE 12
HUMAN HEALTH RISK ASSESSMENT SUMMARY USING HEALTH‐BASED REMEDIATION GOAL CONCENTRATIONS ROHR INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

Location Receptor Incremental Lifetime Cancer Risk Hazard Index B29‐V04 On‐Site Commerical/Industrial Worker 7E‐06 1
B29‐V07 On‐Site Commerical/Industrial Worker 1E‐05 1
B29‐V09 On‐Site Commerical/Industrial Worker 1E‐05 1
B29‐V16 On‐Site Commerical/Industrial Worker 9E‐06 1
B29‐V19 On‐Site Commerical/Industrial Worker 4E‐06 1
PW06‐SV‐3.5 On‐Site Commerical/Industrial Worker 8E‐06 1 PW07‐SV‐4 On‐Site Commerical/Industrial Worker 1E‐05 1
PW09‐SV‐4.5 On‐Site Commerical/Industrial Worker 1E‐05 1 PW12‐SV‐3 On‐Site Commerical/Industrial Worker 1E‐05 0.4 PW14‐SV‐4 On‐Site Commerical/Industrial Worker 4E‐06 1
PW14‐SV‐4DUP On‐Site Commerical/Industrial Worker 4E‐06 1 PW15‐SV‐4.5 On‐Site Commerical/Industrial Worker 4E‐06 1 DGA‐004‐1‐SG On‐Site Commerical/Industrial Worker 1E‐05 1 DGA‐007‐2‐SG On‐Site Commerical/Industrial Worker 1E‐05 1 DGA‐008‐2‐SG On‐Site Commerical/Industrial Worker 4E‐06 1 DGA‐009‐2‐SG On‐Site Commerical/Industrial Worker 1E‐05 1 DGA‐011‐2‐SG On‐Site Commerical/Industrial Worker 4E‐06 1 DGA‐016‐2‐SG On‐Site Commerical/Industrial Worker 1E‐05 1 DGA‐017‐1‐SG On‐Site Commerical/Industrial Worker 8E‐06 1 DGA‐019‐2‐SG On‐Site Commerical/Industrial Worker 7E‐06 1 DGA‐021‐1‐SG On‐Site Commerical/Industrial Worker 9E‐06 1 DGA‐022‐2‐SG On‐Site Commerical/Industrial Worker 1E‐05 1 Building 29 Planned Loading Dock Excavation Area Only On‐Site Construction Worker 5E‐07 1

HALEY & ALDRICH, INC,
2022_0608_HAI_T12_summary.xlsx JULY 2022

FIGURES
117°6'0"W
32°39'0"N
32°37'30"N
ROHR, INC., A COLLINS AEROSPACE COMPANY

NORTH CAMPUS - PARCEL A

CHULA VISTA, CALIFORNIA

SITE LOCUS
APPROXIMATE SCALE: 1 IN = 2,000 FT
JULY 2022 FIGURE 1
GIS FILE PATH: G:\43559_North Campus\000_Global\GIS\Maps\2022_05_PARCELA_HHRA\127827_046_0001_SITE_LOCUS.mxd - USER: dfm - LAST SAVED: 5/3/2022 12:17:27 PM SITE
MAP SOURCE: ESRI
USGS QUAD: NATIONAL CITY, IMPERIAL BEACH
SITE COORDINATES: 32°38'03.8"N, 117°05'56.9"W
ROHR
BUILDING 1
G ST

BAY BOULEVARD

H STREET
56702233
57133002
56701007
56701029
56701030
56702217
56702228
57133030
57133024
56702230
56702231
57133016
57133003
57133029
100
99 29
NOTES

1. ALL LOCATIONS AND DIMENSIONS AREA APPROXIMATE.

2. AERIAL IMAGERY SOURCE: NEARMAP, MARCH 2022
LEGEND

SUBJECT SITE
TO BE RAZED AND EXCAVATED 5 FEET BGS TO CONSTRUCT

LOADING DOCK

PARCEL BOUNDARY AND ASSESSOR'S PARCEL NUMBER
0 125 250

SCALE IN FEET
ROHR, INC., A COLLINS AEROSPACE COMPANY

NORTH CAMPUS - PARCEL A

CHULA VISTA, CALIFORNIA

SITE PLAN
FIGURE 2 SCALE: AS SHOWN
JULY 2022
GIS FILE PATH: G:\43559_North Campus\000_Global\GIS\Maps\2022_05_PARCELA_HHRA\127827_046_0002_SITE_PLAN.mxd - USER: dfm - LAST SAVED: 6/13/2022 1:21:19 PM §¨¦5

BUILDING NUMBER
56701029
29 -10-505101520
ELEVATION IN FEET ABOVE MEAN LOW LEVEL WATER (MLLW) -20 -15 NORTH A -10 -505101520 ELEVATION IN FEET ABOVE MEAN LOW LEVEL WATER (MLLW) -20 -15 SOUTH A' B29-20
B29-23/B29-V03
B29-05/PW-07
B29-30/B29-V09
B29-10/B29-V13
B29-12
B29-15/B29-V16
B29-35C/B29-V19
B99-01
B100-V01 < 0.50 < 27 17 5.36 < 0.50 8 0.67 2.7 30 BUILDING 100 G STREET BUILDING 29 VAULT SILTY SAND SILTY SAND SILT/CLAY SILT/CLAY < 5.0 < 5.1 5.53 < 1.0 < 1.0 22.9 50.2 < 4.9 < 4.8 1.8 J < 4.9 < 5.0 < 5.2 < 5.0 < 5.2 1415 ? ? ? ? ? ? ? ? ? ? 37,800 1,280 1,490
920,000 3,000,000
11,000 16,000 9,800
PW-02
PW-05
B29-V08
PW-11
PW-12
PW-14
PW-15
PW-01B 140 2,900,00 2,400,000 130 2,100 1,500 5.9 35/1,500* 64,000 7,600 13,000 LEGEND FILL SILT/CLAY SILTY SAND LITHOLOGY CONTACT (INFERRED) NOTES 1. ALL LOCATIONS AND DIMENSIONS ARE APPROXIMATE. 2. < 0.50 = NOT DETECTED ABOVE LABORATORY REPORTING LIMIT G:\43559_NORTH CAMPUS\000_GLOBAL\GIS\MAPS\2022_05_PARCELA_HHRA\127827_046_0003_04_CROSS_SECTION.DWG DFM X-SEC A-A' 6/13/2022 1:36 PM Sheet: Printed: FIGURE 3 ROHR, INC., A COLLINS AEROSPACE COMPANY NORTH CAMPUS - PARCEL A CHULA VISTA, CALIFORNIA GEOLOGIC CROSS SECTION A-A' SCALE: AS SHOWN JULY 2022 00 SCALE IN FEET HORIZ. VERT. 120 240 12 24 B27 EXPLORATION DESIGNATION EXPLORATION LEGEND SAMPLE LOCATION SURFACE GROUNDWATER ELEVATION AT TIME OF DRILLING < 0.50 30< 5.0 TRICHLOROETHENE CONCENTRATION SOIL (ug/kg) SOIL GAS (ug/m^3) GROUNDWATER (ug/L) * TETRACHLOROETHENE CONCENTRATION -10-505101520
ELEVATION IN FEET ABOVE MEAN LOW LEVEL WATER (MLLW) -20 -15 WEST B B29-03/B29-V01
B29-22/PW-02*
B29-23/B29-V03
B29-27 -10 -505101520
ELEVATION IN FEET ABOVE MEAN LOW LEVEL WATER (MLLW) -20 -15 EAST B' SILTY SAND SILT/CLAY SILT/CLAY BUILDING 29 LOADING DOCK 6" CONCRETE 50.2 37,800 1,280 1,490 920,000 3,000,000 < 5.2 0.64 1,330 47.4 7,830 92.5 272 2.73 450/450 3,400 7,500 27,000 737 18.6 ? ? 1,600 B29-26/B29-V04/
PW-06*
160,000
B29-24/PW-03*
1,100,000
2,900,000
PW-04
2,500,000 LEGEND FILL : SILTY FINE SAND WITH ASPHALT SILT/CLAY SILTY SAND LITHOLOGY CONTACT (INFERRED) NOTES 1. ALL LOCATIONS AND DIMENSIONS ARE APPROXIMATE. 2. < 0.50 = NOT DETECTED ABOVE LABORATORY REPORTING LIMIT G:\43559_NORTH CAMPUS\000_GLOBAL\GIS\MAPS\2022_05_PARCELA_HHRA\127827_046_0003_04_CROSS_SECTION.DWG DFM X-SEC B-B' 6/13/2022 1:36 PM Sheet: Printed: FIGURE 4 ROHR, INC., A COLLINS AEROSPACE COMPANY NORTH CAMPUS - PARCEL A CHULA VISTA, CALIFORNIA GEOLOGIC CROSS SECTION B-B' SCALE: AS SHOWN JULY 2022 00 SCALE IN FEET HORIZ. VERT. 120 240 12 24 B27 EXPLORATION DESIGNATION EXPLORATION LEGEND SAMPLE LOCATION SURFACE GROUNDWATER ELEVATION AT TIME OF DRILLING < 0.50 30< 5.0 TRICHLOROETHENE CONCENTRATION SOIL (ug/kg) SOIL GAS (ug/m^3) GROUNDWATER (ug/L) * PROBE LOCATED IN VAULT (APPROX. 4 FEET BGS) A@DA@ A@DA@D
A@D
A@DA@
A@D
A@D A@D
A@D
A@
A@
A@
A@
A@
A@
A@
?!
A@
A@DA@ A@DA@D
A@D
A@DA@
?!A@
?!"
?!A@
DB-4
OW-4
OW-3
OW-1
OW-2
DB-5
DB-2
100
99 29
B100-V01
B100-V02
B100-V03
B11
B12
B15
B29-01
B29-02
B29-02A
B29-02B
B29-02C
B29-03
B29-03A
B29-03B
B29-04
B29-05
B29-05A
B29-05B
B29-05C
B29-06
B29-07 B29-07A
B29-07B
B29-08
B29-09
B29-10
B29-11
B29-12
B29-13
B29-14
B29-15
B29-16 B29-17
B29-18
B29-19
B29-20
B29-21 B29-22
B29-23
B29-24
B29-25
B29-26
B29-27
B29-28 B29-29
B29-30 B29-31
B29-32A
B29-32B
B29-32C
B29-33A
B29-33B
B29-33C
B29-34A B29-34B
B29-34C
B29-35A
B29-35B
B29-35C
B29-V01 B29-V02
B29-V03
B29-V04 B29-V05
B29-V06 B29-V07
B29-V08
B29-V09
B29-V10
B29-V11
B29-V12
B29-V13 B29-V14
B29-V15
B29-V16
B29-V17
B29-V18
B29-V19
B99-01
B99-02
B99-03
B99-04
B99-V01
B99-V02
B99-V03
B99-V04
B99-V05
B99-V06
BB-17
BB-18
BB-19
BB-20
BB-21
BB-22
BB-23
BB-24
PW-01A
PW-01B
PW-02
PW-03
PW-04
PW-05
PW-06
PW-07
PW-08
PW-09
PW-11 PW-12
PW-13
PW-14 PW-15
PW-16
UT-02 UT-03 UT-19 UT-20 UT-21
UT-23 UT-22
UT-24
UT-25
UT-66
DGA-003
DGA-004
DGA-007
DGA-008
DGA-009
DGA-013 DGA-011
DGA-014 DGA-015
DGA-016
DGA-017
DGA-019
DGA-021
DGA-022
DGA-024 DGA-025
DGA-026
56702233
56701007
56702228
57133030
57133024
56702230
56702231
57133016
57133003
57133029
56702216
MW-A

MW-B MW-C
MW-D
DB-4
OW-4
OW-3
OW-1
DB-2
OW-2
NCW-021A
NCW-022A
NCW-022B
NCW-022C
FIGURE 5
0 125 250

SCALE IN FEET
GIS FILE PATH: G:\43559_North Campus\000_Global\GIS\Maps\2022_05_PARCELA_HHRA\127827_046_0005_SAMPLE_LOCATION_MAP.mxd - USER: dfm - LAST SAVED: 6/13/2022 2:06:04 PM LEGEND

SOIL BORING

SOIL GAS SAMPLE LOCATION

MONITORING WELL ZONE
A@ A
?!" LB
?! UB
A@D DESTROYED MONITORING

WELL/TRANSDUCER

CROSS SECTION LINE
VAULT (4 FEET BGS, INSTALLED IN 2000)
TO BE RAZED AND EXCAVATED 5 FEET

BELOW GROUND SURFACE TO

CONSTRUCT LOADING DOCK

ASSESSOR'S PARCEL BOUNDARY AND
NUMBER

SUBJECT SITE
NOTES

1. ALL LOCATIONS AND DIMENSIONS ARE APPROXIMATE.

2. AERIAL IMAGERY SOURCE: NEARMAP, APRIL 2022
ROHR, INC., A COLLINS AEROSPACE COMPANY

NORTH CAMPUS - PARCEL A

CHULA VISTA, CALIFORNIA

SAMPLE LOCATION MAP
SCALE: AS SHOWN
JULY 2022

BUILDING NUMBER
56701029
29 B'
B
A A'

SAN DIEGO PUMPS
& COMPRESSOR
SUPPLY
368 BAY
FORMER SHALLOW SWALE (1948)
161 161
3-09596 3-09596
148 148147 147
146 146
145 145
161 161
301 301
300 300

JACKSON'S

IMPORT AUTO
350-360 BAY

SAN DIEGO PUMP
& COMPRESSOR SUPPLY
364-368 BAY

MAINTENANCE

DEPARTMENT
FORMER

FORMER TRUCK

ENGINE REPAIR
100
99 29

G STREET
INTERSTATE 5

BAY BOULEVARD
VAULT (4 FEET BGS)

WESTERN DRAINAGE SWALE

SAN DIEGO & ARIZONA EASTERN RAIL ROAD
304A
304C 304C
304B
304D
204 204
200 200
226 226
202 202 201 201
203 203
56702233
56701007 56702228
57133030
57133024
56702230
56702231
57133016
57133003
57133029
56702216
ROHR, INC., A COLLINS AEROSPACE COMPANY

NORTH CAMPUS - PARCEL A

CHULA VISTA, CALIFORNIA
FIGURE 6 SCALE: AS SHOWN
JULY 2022
0 125 250

SCALE IN FEET
GIS FILE PATH: G:\43559_North Campus\000_Global\GIS\Maps\2022_05_PARCELA_HHRA\127827_046_0006_HISTORICAL_FEATURES_LOCATIONS.mxd - USER: dfm - LAST SAVED: 6/13/2022 2:12:08 PM LEGEND

FORMER MILLS/LATHES

FORMER VESSELS AND VAULTS

UST (UNDERGROUND STORAGE TANK)

BASED ON DEH EVALUATION OF CCR
TITLE 23. CLOSED THROUGH REMOVAL OR
FILLING.

UV (UNDERGROUND VESSEL)

AST (ABOVEGROUND STORAGE TANK)

PAINT BOOTH

DEGREASER

STORM WATER CONVEYANCE SYSTEM
VAULT (4 FEET BGS, INSTALLED IN 2000)

ASSESSOR'S PARCEL BOUNDARY AND
NUMBER

FORMER EXCAVATION AREA

SUBJECT SITE
NOTES

1. ALL LOCATIONS AND DIMENSIONS ARE APPROXIMATE.

2. SOURCES: ABC 1998, URS 2013, ROHR MILLS AND LATHES - EQUIPMENT MANUAL

3. THE LOCATIONS OF FORMER VESSELS AND VAULTS FROM ABC 1998 AND URS 2013.

SOME LOCATIONS HAVE BEEN ADJUSTED BASED ON SITE RECONNAISSANCE.

4. AERIAL IMAGERY SOURCE: NEARMAP, APRIL 2022

HISTORICAL ENVIRONMENTAL

SITE FEATURES

BUILDING NUMBER
56701029
29 ROHR, INC., A

COLLINS AEROSPACE COMPANY

NORTH CAMPUS - PARCEL A

CHULA VISTA, CALIFORNIA

POTENTIAL EXPOSURE PATHWAYS

NORTH CAMPUS - PARCEL A
JULY 2022
FIGURE7
LEGEND
!(
!(
!( !(!(
!(
!(!(
!(
!( !( !(
!( !(
!( !(
!( !(
!(
B29-V05
B29-V07
B29-V01 B29-V02
B29-V09
B29-V10
B29-V13
B29-V11 B29-V15
B29-V16
B29-V17
B29-V19
B29-V18
B29-V08
B29-V04
B29-V03*
B29-V06
B99-V01
B99-V02
B99-V05
B99-V06
B100-V02
B100-V03
B99-V03
B99-V04
B100-V01 B29-V14
B29-V12
PW-16
PW-15
PW-12 PW-11
PW-05* PW-07
PW-02*
PW-03*
PW-06
PW-01B
PW-14
PW-13
PW-10
PW-08
PW-04*
PW-09

G ST REET
INT ERST AT E 5

BAY BOU L EV ARD
DGA-003
DGA-004
DGA-007
DGA-008
DGA-009
DGA-011 DGA-013
DGA-014
DGA-015
DGA-016
DGA-017
DGA-019
DGA-021
DGA-022
100
99 29
ROHR, INC., A COL L INS AEROSPACE COMPANY

NORT H CAMPU S - PARCEL A

CHU L A V IST A, CAL IFORNIA
SCAL E: AS SHOWN
JU LY 2022 FIGU RE 8
0 125 250

SCAL E IN FEET
GIS FIL E PAT H: G:\43559_North Cam pus\000_Global\GIS\Maps\2022_05_PARCEL A_HHRA\127827_046_0008_SOIL _V APOR_SAMPL E_EX CEED_HBRG.m xd ― U SER: dfm ― L AST SAV ED: 6/13/2022 2:20:01 PM LEGEND

SOIL GAS PROBE
!( SOIL GAS SAMPL E L OCAT ION WIT H

CONCENT RAT IONS GREAT ER T HAN

HEAL T H-BASED REMEDIAT ION GOAL S

FORMER MIL L S/L AT HES

FORMER V ESSEL S AND V AU L T S

U ST (U NDERGROU ND ST ORAGE T ANK)

BASED ON DEH EV AL U AT ION OF CCR
T IT L E 23. CL OSED T HROU GH REMOV AL OR
FIL L ING.

U V (U NDERGROU ND V ESSEL )

AST (ABOV EGROU ND ST ORAGE T ANK)

PAINT BOOT H

DEGREASER
T O BE RAZ ED AND EX CAV AT ED 5 FEET

BGS T O CONST RU CT L OADING DOCK

SU BJECT SIT E
NOTES

1. AL L L OCAT IONS AND DIMENSIONS ARE APPROX IMAT E.

2. SOU RCES: ABC 1998, U RS 2013, ROHR MIL L S AND L AT HES - EQU IPMENT MANU AL

3. T HE L OCAT IONS OF FORMER V ESSEL S AND V AU L T S FROM ABC 1998 AND U RS 2013.

SOME L OCAT IONS HAV E BEEN ADJU ST ED BASED ON SIT E RECONNAISSANCE.

4. * = T HESE SAMPL E L OCAT IONS WERE NOT EV AL U AT ED SINCE T HEY ARE L OCAT ED IN T HE PORT ION OF T HE BU IL DING T HAT IS T O BE DEMOL ISHED.

5. AERIAL IMAGERY SOU RCE: NEARMAP, APRIL 2022

SOIL GAS SAMPL E L OCAT IONS WIT H

CONCENT RAT IONS GREAT ER T HAN

HEAL T H-BASED REMEDIAT ION GOAL S
29 BU IL DING NU MBER
!(
!(
B29-18
B29-17
B29-13
B29-15
B29-14
B29-11
B29-10
B29-08
B29-06
B29-04
B99-04
B99-02
B99-03
B29-03 B29-07
B29-05
B29-12
B29-19
B29-20
B29-09
B99-01
B29-02
B29-01
B29-16
B29-21
FORMER MAINT.

DEPT.

UT-22
UT-25 UT-23 UT-24
B29-02B
B29-02A B29-02C
B29-25 B29-34C
B29-34A
B29-34B
B29-30
B29-03B
B29-03A
B29-07B
B29-07A
B29-24
B29-22
B29-27
B29-31
B29-29
B29-26
B29-28
B29-23
B29-35B
B29-35C
B29-35A
B29-05B
B29-05C
B29-05A
B29-32B
B29-32A B29-32C
B29-33A
B29-33B
B29-33C
BB-24
BB-19 BB-22
BB-23 BB-20
BB-17
BB-18 BB-21

G STREET
IN TERSTATE 5

BAY BOULEV ARD
DGA-003
DGA-004
DGA-007
DGA-008
DGA-009
DGA-011
DGA-013
DGA-015 DGA-014
DGA-016
DGA-017
DGA-019
DGA-021
DGA-024 DGA-022
DGA-025
PW-12 PW-15
PW-11
PW-07
100
99 29
ROHR, IN C., A COLLIN S AEROSPACE COMPAN Y

N ORTH CAMPUS - PARCEL A

CHULA V ISTA, CALIFORN IA
SCALE: AS SHOW N
JULY 2022 FIGURE 9
0 125 250

SCALE IN FEET
GIS FILE PATH: G:\43559_ N orth Ca m pus\000_ Globa l\GIS\Ma ps\2022_ 05_ PARCELA_ HHRA\127827_ 046_ 0009_ SOIL_ SAMPLE_ EXCEED_ GPL_ HBRG.m xd ― USER: dfm ― LAST SAV ED: 6/13/2022 2:50:29 PM LEGEND

BORIN G LOCATION
!(

SOIL SAMPLE LOCATION W ITH

CON CEN TRATION S GREATER THAN

HEALTH-BASED REMEDIATION GOALS
(CON STRUCTION W ORKER)

FORMER MILLS/LATHES

FORMER V ESSELS AN D V AULTS

UST (UN DERGROUN D STORAGE TAN K)

BASED ON DEH EV ALUATION OF CCR
TITLE 23. CLOSED THROUGH REMOV AL OR
FILLIN G.

UV (UN DERGROUN D V ESSEL)

AST (ABOV EGROUN D STORAGE TAN K)

PAIN T BOOTH

DEGREASER
TO BE RAZ ED AN D EXCAV ATED 5 FEET

BGS TO CON STRUCT LOADIN G DOCK

SUBJECT SITE
NOTES

1. ALL LOCATION S AN D DIMEN SION S ARE APPROXIMATE.

2. SOURCES: ABC 1998, URS 2013, ROHR MILLS AN D LATHES - EQUIPMEN T MAN UAL

3. THE LOCATION S OF FORMER V ESSELS AN D V AULTS FROM ABC 1998 AN D URS 2013.

SOME LOCATION S HAV E BEEN ADJUSTED BASED ON SITE RECON N AISSAN CE.

4. AERIAL IMAGERY SOURCE: N EARMAP, APRIL 2022

SOIL SAMPLE LOCATION S W ITH

CON CEN TRATION S GREATER THAN

HEALTH-BASED REMEDIATION GOALS
29 BUILDIN G N UMBER

APPENDIX A
Soil and Sub-Slab Soil Vapor and Groundwater Data Tables TABLE A‐1
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 99/100 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

Location B99‐01 B99‐01 B99‐02 B99‐02 B99‐03 B99‐03 B99‐04 B99‐04 BB‐17 BB‐17 BB‐18 Sample Name B99‐01‐1 B99‐01‐5 B99‐02‐1 B99‐02‐4 B99‐03‐1 B99‐03‐4 B99‐04‐1 B99‐04‐3 BB‐17‐01 BB‐17‐04 BB‐18‐01 Sample Date 6/27/2016 6/27/2016 6/27/2016 6/27/2016 6/27/2016 6/27/2016 6/27/2016 6/27/2016 6/28/2016 6/28/2016 6/28/2016 Sample Depth (bgs) 0.5‐1.0 (ft) 4.5‐5.0 (ft) 0.5‐1.0 (ft) 3.5‐4.0 (ft) 0.5‐1.0 (ft) 3.5‐4.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) 0.5‐1.0 (ft) 3.5‐4.0 (ft) 0.5‐1.0 (ft) Inorganics (mg/kg)
Antimony < 0.769 < 0.714 < 0.781 < 0.746 < 0.732 < 0.761 < 0.732 0.276 J < 0.754 < 0.732 < 0.765 Arsenic 3.62 B 0.661 B,J 3.06 2.62 2.26 1.47 2.5 2.94 3.25 1.38 5.58 Barium 73 B 80.8 B 72.5 394 54 59.1 68.8 136 72.6 69.5 79.4 Beryllium 0.266 0.394 0.289 0.434 0.225 J 0.333 0.338 0.462 0.239 J 0.309 0.242 J Cadmium 0.454 J 0.365 J 0.481 J 0.411 J 0.298 J 0.309 J 0.368 J 0.429 J 0.407 J 0.335 J 0.451 J Chromium 14.8 18.3 16.6 21.1 12.5 16.9 19.6 22.2 12.8 16.3 17.5Cobalt 9.09 11.3 8.87 15 6.44 9.29 9.44 11 4.42 9.81 3.74 Copper 24.2 11.7 22.2 12.5 3.88 8.35 18 14.3 7.64 10 10.9Lead 12.5 4.29 33.9 14.5 2.7 3.52 9.95 4 9.76 4.17 17.6Mercury 0.00722 J < 0.0794 0.027 J < 0.082 < 0.0806 < 0.0847 0.0131 J 0.00821 J 0.00945 J 0.0215 J 0.0239 J Molybdenum 0.174 J < 0.238 < 0.26 < 0.249 < 0.244 < 0.254 < 0.244 < 0.238 0.425 < 0.244 0.863 Nickel 7.58 9.51 7.98 9.51 4.75 7.72 13.3 10.8 5.91 7.24 5.92Selenium < 0.769 0.395 J < 0.781 < 0.746 < 0.732 < 0.761 < 0.732 < 0.714 0.903 0.368 J < 0.765 Silver < 0.256 < 0.238 < 0.26 < 0.249 < 0.244 < 0.254 < 0.244 < 0.238 < 0.251 < 0.244 0.185 J Thallium < 0.769 < 0.714 < 0.781 < 0.746 < 0.732 0.196 J < 0.732 < 0.714 0.252 J < 0.732 0.47 J Vanadium 43.4 61 43 67.8 47.3 53.5 52.8 65.6 29.6 51.5 23.9Zinc 39.8 B 36.5 B 66 46.2 30.7 26.3 54.6 43.9 33 24.8 48.2 Other (%)
Moisture 10 13 5.5 15 18 25 10 14 3.5 3.8 5
PCBs (mg/kg)
Aroclor‐1016 (PCB‐1016) < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 Aroclor‐1221 (PCB‐1221) < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 Aroclor‐1232 (PCB‐1232) < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 Aroclor‐1242 (PCB‐1242) < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 Aroclor‐1248 (PCB‐1248) < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 Aroclor‐1254 (PCB‐1254) < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 0.12 < 0.05 < 0.05 Aroclor‐1260 (PCB‐1260) < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 Aroclor‐1262 (PCB‐1262) < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 Aroclor‐1268 (PCB‐1268) < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 Total PCBs < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 0.12 < 0.05 < 0.05 HALEY & ALDRICH, INC.
01_2022‐07‐HAI‐T01Analytical_Bldg99_100.xlsx JULY 2022
TABLE A‐1
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 99/100 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

Location B99‐01 B99‐01 B99‐02 B99‐02 B99‐03 B99‐03 B99‐04 B99‐04 BB‐17 BB‐17 BB‐18 Sample Name B99‐01‐1 B99‐01‐5 B99‐02‐1 B99‐02‐4 B99‐03‐1 B99‐03‐4 B99‐04‐1 B99‐04‐3 BB‐17‐01 BB‐17‐04 BB‐18‐01 Sample Date 6/27/2016 6/27/2016 6/27/2016 6/27/2016 6/27/2016 6/27/2016 6/27/2016 6/27/2016 6/28/2016 6/28/2016 6/28/2016 Sample Depth (bgs) 0.5‐1.0 (ft) 4.5‐5.0 (ft) 0.5‐1.0 (ft) 3.5‐4.0 (ft) 0.5‐1.0 (ft) 3.5‐4.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) 0.5‐1.0 (ft) 3.5‐4.0 (ft) 0.5‐1.0 (ft) PEST (mg/kg)
4,4'‐DDD < 0.025 ‐‐‐ 0.0031 J ‐ 0.031 ‐ < 0.005 ‐‐
4,4'‐DDE 0.81 ‐‐‐ 0.024 ‐ 0.18 ‐ < 0.005 ‐‐4,4'‐DDT 0.1 ‐‐‐ 0.0027 J ‐ 0.031 ‐ 0.0048 J ‐‐ Aldrin < 0.025 ‐‐‐ < 0.005 ‐ < 0.005 ‐ < 0.005 ‐‐
alpha‐BHC < 0.05 ‐‐‐ < 0.01 ‐ < 0.01 ‐ < 0.01 ‐‐
beta‐BHC < 0.025 ‐‐‐ < 0.005 ‐ < 0.005 ‐ < 0.005 ‐‐
Chlordane < 0.25 ‐‐‐ < 0.05 ‐ < 0.05 ‐ < 0.05 ‐‐
delta‐BHC < 0.05 ‐‐‐ < 0.01 ‐ < 0.01 ‐ < 0.01 ‐‐
Dieldrin < 0.025 ‐‐‐ < 0.005 ‐ < 0.005 ‐ < 0.005 ‐‐
Endosulfan I< 0.025 ‐‐‐ < 0.005 ‐ < 0.005 ‐ < 0.005 ‐‐
Endosulfan II < 0.025 ‐‐‐ < 0.005 ‐ < 0.005 ‐ < 0.005 ‐‐ Endosulfan sulfate < 0.025 ‐‐‐ < 0.005 ‐ < 0.005 ‐ < 0.005 ‐‐ Endrin < 0.025 ‐‐‐ < 0.005 ‐ < 0.005 ‐ < 0.005 ‐‐
Endrin aldehyde < 0.025 ‐‐‐ < 0.005 ‐ < 0.005 ‐ < 0.005 ‐‐ Endrin ketone < 0.025 ‐‐‐ < 0.005 ‐ < 0.005 ‐ < 0.005 ‐‐ gamma‐BHC (Lindane) < 0.025 ‐‐‐ < 0.005 ‐ < 0.005 ‐ < 0.005 ‐‐ Heptachlor < 0.025 ‐‐‐ < 0.005 ‐ < 0.005 ‐ < 0.005 ‐‐
Heptachlor epoxide 0.022 J ‐‐‐ < 0.01 ‐ < 0.01 ‐ < 0.01 ‐‐ Methoxychlor < 0.025 ‐‐‐ < 0.005 ‐ < 0.005 ‐ < 0.005 ‐‐ Toxaphene < 0.5 ‐‐‐ < 0.1 ‐ < 0.1 ‐ < 0.1 ‐‐
SVOCs (mg/kg)
Acenaphthene < 0.015 ‐‐‐ < 0.015 ‐ < 0.015 ‐‐‐ < 0.015
Acenaphthylene < 0.03 ‐‐‐ < 0.03 ‐ < 0.03 ‐‐‐ < 0.03
Anthracene < 0.01 ‐‐‐ < 0.01 ‐ < 0.01 ‐‐‐ 0.0082 J
Benzo(a)anthracene < 0.01 ‐‐‐ < 0.01 ‐ < 0.01 ‐‐‐ 0.0055 J Benzo(a)pyrene < 0.01 ‐‐‐ < 0.01 ‐ < 0.01 ‐‐‐ 0.019
Benzo(b)fluoranthene < 0.01 ‐‐‐ < 0.01 ‐ < 0.01 ‐‐‐ 0.021 Benzo(g,h,i)perylene < 0.01 ‐‐‐ < 0.01 ‐ < 0.01 ‐‐‐ 0.028 Benzo(k)fluoranthene < 0.01 ‐‐‐ < 0.01 ‐ < 0.01 ‐‐‐ 0.047 Chrysene < 0.01 ‐‐‐ < 0.01 ‐ < 0.01 ‐‐‐ 0.02
Dibenz(a,h)anthracene < 0.01 ‐‐‐ < 0.01 ‐ < 0.01 ‐‐‐ 0.06 Fluoranthene < 0.01 ‐‐‐ < 0.01 ‐ < 0.01 ‐‐‐ 0.054
Fluorene < 0.01 ‐‐‐ < 0.01 ‐ < 0.01 ‐‐‐ < 0.01
Indeno(1,2,3‐cd)pyrene < 0.01 ‐‐‐ < 0.01 ‐ < 0.01 ‐‐‐ 0.11 Phenanthrene < 0.01 ‐‐‐ < 0.01 ‐ < 0.01 ‐‐‐ 0.023
Pyrene < 0.01 ‐‐‐ < 0.01 ‐ < 0.01 ‐‐‐ 0.032
HALEY & ALDRICH, INC.
01_2022‐07‐HAI‐T01Analytical_Bldg99_100.xlsx JULY 2022
TABLE A‐1
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 99/100 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

Location B99‐01 B99‐01 B99‐02 B99‐02 B99‐03 B99‐03 B99‐04 B99‐04 BB‐17 BB‐17 BB‐18 Sample Name B99‐01‐1 B99‐01‐5 B99‐02‐1 B99‐02‐4 B99‐03‐1 B99‐03‐4 B99‐04‐1 B99‐04‐3 BB‐17‐01 BB‐17‐04 BB‐18‐01 Sample Date 6/27/2016 6/27/2016 6/27/2016 6/27/2016 6/27/2016 6/27/2016 6/27/2016 6/27/2016 6/28/2016 6/28/2016 6/28/2016 Sample Depth (bgs) 0.5‐1.0 (ft) 4.5‐5.0 (ft) 0.5‐1.0 (ft) 3.5‐4.0 (ft) 0.5‐1.0 (ft) 3.5‐4.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) 0.5‐1.0 (ft) 3.5‐4.0 (ft) 0.5‐1.0 (ft) VOCs (mg/kg)
2‐Butanone (Methyl Ethyl Ketone) < 0.051 < 0.05 < 0.05 < 0.051 < 0.052 < 0.05 < 0.051 < 0.05 < 0.051 < 0.05 < 0.05 Acetone < 0.13 < 0.12 < 0.13 < 0.13 < 0.13 < 0.12 < 0.13 < 0.12 < 0.13 < 0.13 < 0.12 Cymene (p‐Isopropyltoluene) < 0.0051 < 0.005 < 0.005 < 0.0051 < 0.0052 < 0.005 < 0.0051 < 0.005 < 0.0051 < 0.005 < 0.005 m,p‐Xylenes < 0.0051 < 0.005 0.00076 J < 0.0051 < 0.0052 < 0.005 < 0.0051 < 0.005 < 0.0051 < 0.005 < 0.005 Methylene chloride < 0.051 < 0.05 < 0.05 < 0.051 < 0.052 < 0.05 < 0.051 < 0.05 < 0.051 < 0.05 < 0.05 Notes and Abbreviations:

BOLD = concentration detected at or above
reported detection limit.

Detected VOCs and SVOCs are shown.
< = analyte not detected above the indicated
reporting limit.

B = compound detected in the associated blank
J = estimated concentration.
‐ = not analyzed or not applicable.
mg/kg = milligrams per kilogram.bgs = below ground surface.

HALEY & ALDRICH, INC.
01_2022‐07‐HAI‐T01Analytical_Bldg99_100.xlsx JULY 2022
TABLE A‐1
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 99/100 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

LocationSample Name
Sample DateSample Depth (bgs)Inorganics (mg/kg)
AntimonyArsenicBariumBerylliumCadmiumChromiumCobaltCopperLeadMercuryMolybdenumNickelSeleniumSilverThalliumVanadiumZinc Other (%)
Moisture
PCBs (mg/kg)
Aroclor‐1016 (PCB‐1016)
Aroclor‐1221 (PCB‐1221)
Aroclor‐1232 (PCB‐1232)
Aroclor‐1242 (PCB‐1242)
Aroclor‐1248 (PCB‐1248)
Aroclor‐1254 (PCB‐1254)
Aroclor‐1260 (PCB‐1260)
Aroclor‐1262 (PCB‐1262)
Aroclor‐1268 (PCB‐1268)
Total PCBs
BB‐18 BB‐19 BB‐19 BB‐20 BB‐20 BB‐21 BB‐21 BB‐22 BB‐22 BB‐23 BB‐23 BB‐18‐04 BB‐19‐01 BB‐19‐03 BB‐20‐01 BB‐20‐03 BB‐21‐01 BB‐21‐03 BB‐22‐01 BB‐22‐03 BB‐23‐01 BB‐23‐03 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016

3.5‐4.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) < 0.765 < 0.761 < 0.732 < 0.718 0.43 J < 0.773 < 0.735 < 0.739 < 0.721 < 0.721 < 0.789

1.77 6.75 2.06 2.77 2.44 4.41 2.06 3.04 2.17 2.27 1.3974.9 92.9 83.4 99.5 76.8 82.5 84.9 57.8 77.9 73.1 74.7

0.318 0.282 0.326 0.305 0.377 1.38 0.254 0.271 0.333 0.273 0.3810.881 0.432 J 0.51 0.881 0.432 J 1.35 0.498 1.18 0.45 J 0.866 0.353 J 17 14.3 16.9 15.6 18 12.3 13.1 14.1 17.2 15.1 19

9.32 4.55 9.24 8.13 11.2 6.19 7.62 6.11 9.93 8.36 11.223.5 13.6 20.4 21.3 12.8 11.2 16.2 8.59 20.2 28.8 9.9122.7 14.5 14.9 32.5 8.08 9.18 22.1 7.31 13.6 42.6 4.48

0.0234 J 0.0218 J 0.0235 J 0.0194 J 0.0182 J 0.0177 J 0.0192 J < 0.082 0.0184 J 0.106 0.007 J

0.147 J 0.884 < 0.244 0.401 < 0.251 1.04 0.152 J < 0.246 0.243 < 0.24 < 0.263

8.92 7.5 7.51 8.96 8.38 6.68 6.41 6.44 7.59 7.57 8.45

0.467 J 1.16 < 0.732 < 0.718 < 0.754 0.857 0.531 J < 0.739 0.421 J < 0.721 < 0.789 < 0.255 < 0.254 < 0.244 < 0.239 < 0.251 < 0.258 < 0.245 < 0.246 < 0.24 < 0.24 < 0.263

0.181 J 0.734 J 0.223 J 0.192 J < 0.754 0.929 < 0.735 < 0.739 0.156 J < 0.721 < 0.789

49.6 27.2 49.8 41.2 58 28.9 39.6 34.7 51.5 42.9 63.655.5 56.9 43.6 70 34.7 40.6 65.7 42.9 40.3 78.3 31.6

6.3 3.1 3.4 3.5 4.8 4.5 3 2.3 4 2.9 6.4
< 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05< 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 0.033 J < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 0.033 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 HALEY & ALDRICH, INC.
01_2022‐07‐HAI‐T01Analytical_Bldg99_100.xlsx JULY 2022
TABLE A‐1
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 99/100 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

LocationSample Name
Sample DateSample Depth (bgs)
PEST (mg/kg)
4,4'‐DDD
4,4'‐DDE
4,4'‐DDT
Aldrinalpha‐BHC
beta‐BHCChlordanedelta‐BHCDieldrinEndosulfan I
Endosulfan II
Endosulfan sulfate
EndrinEndrin aldehyde
Endrin ketonegamma‐BHC (Lindane)
HeptachlorHeptachlor epoxide
MethoxychlorToxaphene
SVOCs (mg/kg)
AcenaphtheneAcenaphthyleneAnthraceneBenzo(a)anthraceneBenzo(a)pyreneBenzo(b)fluorantheneBenzo(g,h,i)peryleneBenzo(k)fluorantheneChryseneDibenz(a,h)anthraceneFluorantheneFluoreneIndeno(1,2,3‐cd)pyrene PhenanthrenePyrene
BB‐18 BB‐19 BB‐19 BB‐20 BB‐20 BB‐21 BB‐21 BB‐22 BB‐22 BB‐23 BB‐23 BB‐18‐04 BB‐19‐01 BB‐19‐03 BB‐20‐01 BB‐20‐03 BB‐21‐01 BB‐21‐03 BB‐22‐01 BB‐22‐03 BB‐23‐01 BB‐23‐03 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016

3.5‐4.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) ‐ < 0.005 ‐‐‐ < 0.005 ‐‐‐ 0.0099 ‐
‐ 0.0024 J ‐‐‐ 0.0074 ‐‐‐ 1 ‐
‐ 0.0041 J ‐‐‐ < 0.005 ‐‐‐ 0.23 ‐
‐ < 0.005 ‐‐‐ < 0.005 ‐‐‐ < 0.005 ‐
‐ < 0.01 ‐‐‐ < 0.01 ‐‐‐ < 0.0099 ‐
‐ < 0.005 ‐‐‐ < 0.005 ‐‐‐ < 0.005 ‐
‐ 0.033 J ‐‐‐ 0.03 J ‐‐‐ < 0.05 ‐
‐ < 0.01 ‐‐‐ < 0.01 ‐‐‐ < 0.0099 ‐
‐ < 0.005 ‐‐‐ < 0.005 ‐‐‐ < 0.005 ‐
‐ < 0.005 ‐‐‐ < 0.005 ‐‐‐ < 0.005 ‐
‐ < 0.005 ‐‐‐ < 0.005 ‐‐‐ < 0.005 ‐
‐ < 0.005 ‐‐‐ < 0.005 ‐‐‐ < 0.005 ‐
‐ < 0.005 ‐‐‐ < 0.005 ‐‐‐ < 0.005 ‐
‐ < 0.005 ‐‐‐ < 0.005 ‐‐‐ < 0.005 ‐
‐ < 0.005 ‐‐‐ < 0.005 ‐‐‐ < 0.005 ‐
‐ < 0.005 ‐‐‐ < 0.005 ‐‐‐ < 0.005 ‐
‐ < 0.005 ‐‐‐ < 0.005 ‐‐‐ < 0.005 ‐
‐ < 0.01 ‐‐‐ < 0.01 ‐‐‐ < 0.0099 ‐
‐ < 0.005 ‐‐‐ < 0.005 ‐‐‐ < 0.005 ‐
‐ < 0.1 ‐‐‐ < 0.1 ‐‐‐ < 0.099 ‐
‐‐‐ < 0.015 ‐‐‐ 0.0061 J ‐ < 0.015 ‐
‐‐‐ < 0.03 ‐‐‐ < 0.03 ‐ 0.011 J ‐
‐‐‐ < 0.01 ‐‐‐ < 0.01 ‐ < 0.0099 ‐
‐‐‐ 0.0092 J ‐‐‐ 0.0031 J ‐ 0.0072 J ‐
‐‐‐ 0.0084 J ‐‐‐ 0.0029 J ‐ 0.018 ‐
‐‐‐ 0.01 ‐‐‐ 0.0054 J ‐ 0.0085 J ‐
‐‐‐ 0.014 ‐‐‐ 0.0048 J ‐ 0.0035 J ‐
‐‐‐ 0.015 ‐‐‐ < 0.01 ‐ 0.0085 J ‐
‐‐‐ 0.013 ‐‐‐ < 0.01 ‐ 0.0067 J ‐
‐‐‐ < 0.01 ‐‐‐ < 0.01 ‐ < 0.0099 ‐
‐‐‐ 0.03 ‐‐‐ < 0.01 ‐ 0.021 ‐
‐‐‐ < 0.01 ‐‐‐ 0.0038 J ‐ < 0.0099 ‐
‐‐‐ 0.0049 J ‐‐‐ < 0.01 ‐ 0.0046 J ‐
‐‐‐ 0.019 ‐‐‐ < 0.01 ‐ 0.0062 J ‐
‐‐‐ 0.058 ‐‐‐ 0.0072 J ‐ 0.031 ‐
HALEY & ALDRICH, INC.
01_2022‐07‐HAI‐T01Analytical_Bldg99_100.xlsx JULY 2022
TABLE A‐1
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 99/100 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

LocationSample Name
Sample DateSample Depth (bgs)
VOCs (mg/kg)
2‐Butanone (Methyl Ethyl Ketone)
AcetoneCymene (p‐Isopropyltoluene)
m,p‐Xylenes
Methylene chloride
Notes and Abbreviations:

BOLD = concentration detected at or above
reported detection limit.

Detected VOCs and SVOCs are shown.
< = analyte not detected above the indicated
reporting limit.

B = compound detected in the associated blank
J = estimated concentration.
‐ = not analyzed or not applicable.
mg/kg = milligrams per kilogram.bgs = below ground surface.

BB‐18 BB‐19 BB‐19 BB‐20 BB‐20 BB‐21 BB‐21 BB‐22 BB‐22 BB‐23 BB‐23 BB‐18‐04 BB‐19‐01 BB‐19‐03 BB‐20‐01 BB‐20‐03 BB‐21‐01 BB‐21‐03 BB‐22‐01 BB‐22‐03 BB‐23‐01 BB‐23‐03 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016

3.5‐4.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) 0.5‐1.0 (ft) 2.5‐3.0 (ft) < 0.049 < 0.052 < 0.052 < 0.052 < 0.051 0.022 J < 0.049 < 0.05 < 0.051 < 0.05 < 0.05 < 0.12 < 0.13 < 0.13 < 0.13 < 0.13 0.076 J < 0.12 < 0.13 < 0.13 < 0.13 < 0.13 < 0.0049 < 0.0052 < 0.0052 0.0023 J < 0.0051 0.029 0.00073 J < 0.005 < 0.0051 < 0.005 < 0.005 < 0.0049 < 0.0052 < 0.0052 < 0.0052 < 0.0051 < 0.005 < 0.0049 < 0.005 < 0.0051 < 0.005 < 0.005 < 0.049 < 0.052 < 0.052 < 0.052 < 0.051 < 0.05 < 0.049 < 0.05 < 0.051 < 0.05 < 0.05 HALEY & ALDRICH, INC.
01_2022‐07‐HAI‐T01Analytical_Bldg99_100.xlsx JULY 2022
TABLE A‐1
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 99/100 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

LocationSample Name
Sample DateSample Depth (bgs)Inorganics (mg/kg)
AntimonyArsenicBariumBerylliumCadmiumChromiumCobaltCopperLeadMercuryMolybdenumNickelSeleniumSilverThalliumVanadiumZinc Other (%)
Moisture
PCBs (mg/kg)
Aroclor‐1016 (PCB‐1016)
Aroclor‐1221 (PCB‐1221)
Aroclor‐1232 (PCB‐1232)
Aroclor‐1242 (PCB‐1242)
Aroclor‐1248 (PCB‐1248)
Aroclor‐1254 (PCB‐1254)
Aroclor‐1260 (PCB‐1260)
Aroclor‐1262 (PCB‐1262)
Aroclor‐1268 (PCB‐1268)
Total PCBs
BB‐24 BB‐24
BB‐24‐01 BB‐24‐03
6/28/2016 6/28/2016

0.5‐1.0 (ft) 2.5‐3.0 (ft)
< 0.758 < 0.777

4.17 1.5772.4 78.3

0.226 J 0.2860.473 J 0.548

9.67 15.35.57 9.5112.4 28.417.3 19

0.019 J 0.0258 J

0.429 0.229 J

5.04 9.37
< 0.758 < 0.777< 0.253 < 0.259< 0.758 < 0.777
29 47.6

59.7 59

2.1 3.5
< 0.05 < 0.05< 0.05 < 0.05< 0.05 < 0.05< 0.05 < 0.05< 0.05 < 0.05< 0.05 < 0.05< 0.05 < 0.05< 0.05 < 0.05 < 0.05 < 0.05< 0.05 < 0.05
HALEY & ALDRICH, INC.
01_2022‐07‐HAI‐T01Analytical_Bldg99_100.xlsx JULY 2022
TABLE A‐1
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 99/100 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

LocationSample Name
Sample DateSample Depth (bgs)
PEST (mg/kg)
4,4'‐DDD
4,4'‐DDE
4,4'‐DDT
Aldrinalpha‐BHC
beta‐BHCChlordanedelta‐BHCDieldrinEndosulfan I
Endosulfan II
Endosulfan sulfate
EndrinEndrin aldehyde
Endrin ketonegamma‐BHC (Lindane)
HeptachlorHeptachlor epoxide
MethoxychlorToxaphene
SVOCs (mg/kg)
AcenaphtheneAcenaphthyleneAnthraceneBenzo(a)anthraceneBenzo(a)pyreneBenzo(b)fluorantheneBenzo(g,h,i)peryleneBenzo(k)fluorantheneChryseneDibenz(a,h)anthraceneFluorantheneFluoreneIndeno(1,2,3‐cd)pyrene PhenanthrenePyrene
BB‐24 BB‐24
BB‐24‐01 BB‐24‐03
6/28/2016 6/28/2016

0.5‐1.0 (ft) 2.5‐3.0 (ft)
< 0.005 ‐

0.015 ‐0.016 ‐
< 0.005 ‐
< 0.01 ‐
< 0.005 ‐
< 0.05 ‐< 0.01 ‐
< 0.005 ‐< 0.005 ‐< 0.005 ‐< 0.005 ‐< 0.005 ‐< 0.005 ‐< 0.005 ‐< 0.005 ‐< 0.005 ‐ < 0.01 ‐
< 0.005 ‐
< 0.1 ‐
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐
HALEY & ALDRICH, INC.
01_2022‐07‐HAI‐T01Analytical_Bldg99_100.xlsx JULY 2022
TABLE A‐1
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 99/100 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

LocationSample Name
Sample DateSample Depth (bgs)
VOCs (mg/kg)
2‐Butanone (Methyl Ethyl Ketone)
AcetoneCymene (p‐Isopropyltoluene)
m,p‐Xylenes
Methylene chloride
Notes and Abbreviations:

BOLD = concentration detected at or above
reported detection limit.

Detected VOCs and SVOCs are shown.
< = analyte not detected above the indicated
reporting limit.

B = compound detected in the associated blank
J = estimated concentration.
‐ = not analyzed or not applicable.
mg/kg = milligrams per kilogram.bgs = below ground surface.

BB‐24 BB‐24
BB‐24‐01 BB‐24‐03
6/28/2016 6/28/2016

0.5‐1.0 (ft) 2.5‐3.0 (ft)
< 0.049 < 0.052
< 0.12 < 0.13
< 0.0049 < 0.0052< 0.0049 < 0.0052
< 0.049 < 0.052
HALEY & ALDRICH, INC.
01_2022‐07‐HAI‐T01Analytical_Bldg99_100.xlsx JULY 2022
TABLE A‐2
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 29 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

Location B11 B12 B29‐01 B29‐01 B29‐02 B29‐02 B29‐02A B29‐02A B29‐02B B29‐02B B29‐02C B29‐02C B29‐03 B29‐03 Sample Name B11‐2.5 B12‐2.5 B29‐01‐1 B29‐01‐2 B29‐02‐1 B29‐02‐2 B29‐02A‐010 B29‐02A‐030 B29‐02B‐010 B29‐02B‐030 B29‐02C‐010 B29‐02C‐030 B29‐03‐01 B29‐03‐03 Sample Date 7/26/2005 7/26/2005 6/27/2016 6/27/2016 6/27/2016 6/27/2016 1/9/2020 1/9/2020 1/9/2020 1/9/2020 1/9/2020 1/9/2020 6/28/2016 6/28/2016 Sample Depth (bgs) 2.5 (ft) 2.5 (ft) 0.5 ‐ 1 (ft) 1.5 ‐ 2 (ft) 0.5 ‐ 1 (ft) 1.5 ‐ 2 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) Metals (mg/kg)
Antimony ‐‐ < 0.145 < 0.155 < 0.147 < 0.147 ‐‐‐‐‐‐ < 0.147 < 0.154 Arsenic ‐‐ 4.23 1.89 23.3 1.37 < 0.46 3.04 < 0.46 < 0.46 < 0.46 < 0.46 19.6 2.64 Barium ‐‐ 72.5 58.4 154 123 ‐‐‐‐‐‐ 182 371
Beryllium ‐‐ 0.329 0.359 0.415 0.343 ‐‐‐‐‐‐ 0.434 0.546 Cadmium ‐‐ 0.438 J 0.348 J 0.251 J 0.288 J ‐‐‐‐‐‐ 0.235 J 0.33 J Chromium ‐‐ 14.3 15.9 8.06 16.1 ‐‐‐‐‐‐ 5.09 14.9Cobalt ‐‐ 9 11.7 2.83 9.67 ‐‐‐‐‐‐ 2.94 9.37Copper ‐‐ 19.8 9.28 6.4 9.05 ‐‐‐‐‐‐ 6.58 6.51Lead ‐‐ 9.55 4.33 9.21 4.42 ‐‐‐‐‐‐ 7.69 5.03Mercury ‐‐ < 0.00618 0.00919 J < 0.00607 < 0.00568 ‐‐‐‐‐‐ < 0.00618 < 0.00578 Molybdenum ‐‐ < 0.128 < 0.137 0.346 < 0.131 ‐‐‐‐‐‐ 0.324 < 0.136 Nickel ‐‐ 8.17 7.63 4.26 7.1 ‐‐‐‐‐‐ 5.19 7.79Selenium ‐‐ < 0.291 < 0.312 0.706 J < 0.297 ‐‐‐‐‐‐ 0.364 J < 0.309 Silver ‐‐ < 0.0832 < 0.0893 0.106 J < 0.0849 ‐‐‐‐‐‐ < 0.0844 < 0.0884 Thallium ‐‐ < 0.147 < 0.158 0.439 J < 0.15 ‐‐‐‐‐‐ 0.328 J < 0.156 Vanadium ‐‐ 41.4 49.3 18 54.5 ‐‐‐‐‐‐ 17.2 43.2Zinc ‐‐ 35.1 26.6 32.8 27.9 ‐‐‐‐‐‐ 33.2 28.3 PCBs (mg/kg)
Aroclor‐1016 (PCB‐1016) ‐‐ < 0.021 < 0.021 < 0.021 < 0.021 ‐‐‐‐‐‐ < 0.021 < 0.021 Aroclor‐1221 (PCB‐1221) ‐‐ < 0.043 < 0.043 < 0.042 < 0.043 ‐‐‐‐‐‐ < 0.043 < 0.042 Aroclor‐1232 (PCB‐1232) ‐‐ < 0.025 < 0.025 < 0.025 < 0.025 ‐‐‐‐‐‐ < 0.025 < 0.025 Aroclor‐1242 (PCB‐1242) ‐‐ < 0.037 < 0.037 < 0.037 < 0.037 ‐‐‐‐‐‐ < 0.037 < 0.037 Aroclor‐1248 (PCB‐1248) ‐‐ < 0.032 < 0.032 < 0.032 < 0.032 ‐‐‐‐‐‐ < 0.032 < 0.032 Aroclor‐1254 (PCB‐1254) ‐‐ < 0.032 < 0.032 < 0.032 < 0.032 ‐‐‐‐‐‐ < 0.032 < 0.032 Aroclor‐1260 (PCB‐1260) ‐‐ < 0.031 < 0.031 < 0.03 < 0.031 ‐‐‐‐‐‐ < 0.031 < 0.03 Aroclor‐1262 (PCB‐1262) ‐‐ < 0.035 < 0.035 < 0.035 < 0.035 ‐‐‐‐‐‐ < 0.035 < 0.035 Aroclor‐1268 (PCB‐1268) ‐‐ < 0.034 < 0.034 < 0.033 < 0.034 ‐‐‐‐‐‐ < 0.034 < 0.033 Total PCBs ‐‐ < 0.043 < 0.043 < 0.042 < 0.043 ‐‐‐‐‐‐ < 0.043 < 0.042 PEST (mg/kg)
4,4'‐DDD ‐‐‐‐ < 0.0024 ‐‐‐‐‐‐‐‐‐
4,4'‐DDE ‐‐‐‐ < 0.0022 ‐‐‐‐‐‐‐‐‐
4,4'‐DDT ‐‐‐‐ < 0.0022 ‐‐‐‐‐‐‐‐‐
Aldrin ‐‐‐‐ < 0.0022 ‐‐‐‐‐‐‐‐‐
alpha‐BHC ‐‐‐‐ < 0.0037 ‐‐‐‐‐‐‐‐‐
beta‐BHC ‐‐‐‐ < 0.0025 ‐‐‐‐‐‐‐‐‐
Chlordane ‐‐‐‐ < 0.026 ‐‐‐‐‐‐‐‐‐
delta‐BHC ‐‐‐‐ < 0.0044 ‐‐‐‐‐‐‐‐‐
Dieldrin ‐‐‐‐ < 0.0022 ‐‐‐‐‐‐‐‐‐
Endosulfan I ‐‐‐‐ < 0.002 ‐‐‐‐‐‐‐‐‐
Endosulfan II ‐‐‐‐ < 0.0024 ‐‐‐‐‐‐‐‐‐
Endosulfan sulfate ‐‐‐‐ < 0.0026 ‐‐‐‐‐‐‐‐‐
Endrin ‐‐‐‐ < 0.0024 ‐‐‐‐‐‐‐‐‐
Endrin aldehyde ‐‐‐‐ < 0.003 ‐‐‐‐‐‐‐‐‐
Endrin ketone ‐‐‐‐ < 0.0025 ‐‐‐‐‐‐‐‐‐
gamma‐BHC (Lindane) ‐‐‐‐ < 0.0022 ‐‐‐‐‐‐‐‐‐
Heptachlor ‐‐‐‐ < 0.0022 ‐‐‐‐‐‐‐‐‐
Heptachlor epoxide ‐‐‐‐ < 0.0037 ‐‐‐‐‐‐‐‐‐
Methoxychlor ‐‐‐‐ < 0.0027 ‐‐‐‐‐‐‐‐‐
Toxaphene ‐‐‐‐ < 0.045 ‐‐‐‐‐‐‐‐‐
HALEY & ALDRICH, INC.
02_2022_07_HAI_T02_B29_ParcelA_SO_Vadose_REV1.xlsx
JULY 2022
TABLE A‐2
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 29 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

Location B11 B12 B29‐01 B29‐01 B29‐02 B29‐02 B29‐02A B29‐02A B29‐02B B29‐02B B29‐02C B29‐02C B29‐03 B29‐03 Sample Name B11‐2.5 B12‐2.5 B29‐01‐1 B29‐01‐2 B29‐02‐1 B29‐02‐2 B29‐02A‐010 B29‐02A‐030 B29‐02B‐010 B29‐02B‐030 B29‐02C‐010 B29‐02C‐030 B29‐03‐01 B29‐03‐03 Sample Date 7/26/2005 7/26/2005 6/27/2016 6/27/2016 6/27/2016 6/27/2016 1/9/2020 1/9/2020 1/9/2020 1/9/2020 1/9/2020 1/9/2020 6/28/2016 6/28/2016 Sample Depth (bgs) 2.5 (ft) 2.5 (ft) 0.5 ‐ 1 (ft) 1.5 ‐ 2 (ft) 0.5 ‐ 1 (ft) 1.5 ‐ 2 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) SVOCs (mg/kg)
Acenaphthene ‐‐‐‐‐‐‐‐‐‐‐‐ < 0.004 ‐
Acenaphthylene ‐‐‐‐‐‐‐‐‐‐‐‐ < 0.0042 ‐
Anthracene ‐‐‐‐‐‐‐‐‐‐‐‐ < 0.002 ‐
Benzo(a)anthracene ‐‐‐‐‐‐‐‐‐‐‐‐ < 0.0025 ‐
Benzo(a)pyrene ‐‐‐‐‐‐‐‐‐‐‐‐ 0.01 ‐
Benzo(b)fluoranthene ‐‐‐‐‐‐‐‐‐‐‐‐ 0.024 ‐
Benzo(g,h,i)perylene ‐‐‐‐‐‐‐‐‐‐‐‐ < 0.0018 ‐
Benzo(k)fluoranthene ‐‐‐‐‐‐‐‐‐‐‐‐ 0.032 ‐
Chrysene ‐‐‐‐‐‐‐‐‐‐‐‐ 0.0045 J ‐
Dibenz(a,h)anthracene ‐‐‐‐‐‐‐‐‐‐‐‐ < 0.0029 ‐
Dimethyl phthalate ‐‐‐‐‐‐‐‐‐‐‐‐ < 0.57 ‐
Fluoranthene ‐‐‐‐‐‐‐‐‐‐‐‐ < 0.0021 ‐
Fluorene ‐‐‐‐‐‐‐‐‐‐‐‐ < 0.0017 ‐
Indeno(1,2,3‐cd)pyrene ‐‐‐‐‐‐‐‐‐‐‐‐ < 0.0022 ‐
Phenanthrene ‐‐‐‐‐‐‐‐‐‐‐‐ < 0.0021 ‐
Pyrene ‐‐‐‐‐‐‐‐‐‐‐‐ < 0.0029 ‐
VOCs (mg/kg)
1,1,1‐Trichloroethane < 0.005 < 0.005 < 0.00023 < 0.00023 < 0.00022 < 0.00024 ‐‐‐‐‐‐ < 0.00023 < 0.00023 1,2,3‐Trimethylbenzene ‐‐‐‐‐‐‐‐‐‐‐‐‐‐
1,2,4‐Trimethylbenzene < 0.005 < 0.005 < 0.0006 < 0.00059 < 0.00058 < 0.00061 ‐‐‐‐‐‐ < 0.00061 < 0.0006 1,3,5‐Trimethylbenzene < 0.005 < 0.005 < 0.00056 < 0.00055 < 0.00055 < 0.00057 ‐‐‐‐‐‐ < 0.00057 < 0.00056 2‐Butanone (Methyl Ethyl Ketone) < 0.05 < 0.05 < 0.0039 < 0.0038 < 0.0037 < 0.0039 ‐‐‐‐‐‐ < 0.0039 < 0.0038 Acetone < 0.05 < 0.05 < 0.0064 < 0.0063 < 0.0062 < 0.0065 ‐‐‐‐‐‐ < 0.0065 < 0.0064 Benzene < 0.005 < 0.005 < 0.00013 < 0.00013 < 0.00013 < 0.00014 ‐‐‐‐‐‐ < 0.00013 < 0.00013 Chloroform (Trichloromethane) < 0.005 < 0.005 < 0.00024 < 0.00024 < 0.00024 < 0.00025 ‐‐‐‐‐‐ < 0.00025 < 0.00024 cis‐1,2‐Dichloroethene < 0.005 < 0.005 < 0.00029 < 0.00028 < 0.00028 < 0.00029 ‐‐‐‐‐‐ < 0.00029 < 0.00028 Cymene (p‐Isopropyltoluene) < 0.005 < 0.005 < 0.00064 < 0.00063 < 0.00063 < 0.00066 ‐‐‐‐‐‐ < 0.00065 < 0.00064 Methyl Tert Butyl Ether < 0.005 < 0.005 < 0.0003 < 0.0003 < 0.00029 < 0.00031 ‐‐‐‐‐‐ < 0.00031 < 0.0003 Methylene chloride < 0.05 < 0.05 < 0.0014 < 0.0013 < 0.0013 < 0.0014 ‐‐‐‐‐‐ < 0.0014 < 0.0014 Naphthalene < 0.05 < 0.05 < 0.00083 < 0.00082 < 0.00081 < 0.00085 ‐‐‐‐‐‐ < 0.00084 < 0.00083 n‐Butylbenzene < 0.005 < 0.005 < 0.00016 < 0.00016 < 0.00016 < 0.00016 ‐‐‐‐‐‐ < 0.00016 < 0.00016 Tetrachloroethene < 0.005 < 0.005 < 0.00021 < 0.00021 < 0.00021 < 0.00022 ‐‐‐‐‐‐ < 0.00022 < 0.00021 trans‐1,2‐Dichloroethene < 0.005 < 0.005 < 0.00052 < 0.00051 < 0.0005 < 0.00053 ‐‐‐‐‐‐ < 0.00052 < 0.00052 Trichloroethene < 0.005 < 0.005 < 0.00031 < 0.0003 < 0.0003 < 0.00031 ‐‐‐‐‐‐ < 0.00031 0.00064 J Notes and Abbreviations:

BOLD = concentration detected at or above
reported detection limit.

Detected VOCs and SVOCs are shown.
< = analyte not detected above the indicated
reporting limit.

B = compound detected in the associated blank
J = estimated concentration.
‐ = not analyzed or not applicable.
mg/kg = milligrams per kilogram.
bgs = below ground surface.

HALEY & ALDRICH, INC.
02_2022_07_HAI_T02_B29_ParcelA_SO_Vadose_REV1.xlsx
JULY 2022
TABLE A‐2
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 29 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

LocationSample Name
Sample Date
Sample Depth (bgs)
Metals (mg/kg)
AntimonyArsenicBariumBerylliumCadmiumChromiumCobaltCopperLeadMercuryMolybdenumNickelSeleniumSilverThalliumVanadiumZinc PCBs (mg/kg)
Aroclor‐1016 (PCB‐1016)
Aroclor‐1221 (PCB‐1221)Aroclor‐1232 (PCB‐1232)Aroclor‐1242 (PCB‐1242)Aroclor‐1248 (PCB‐1248)Aroclor‐1254 (PCB‐1254)Aroclor‐1260 (PCB‐1260)Aroclor‐1262 (PCB‐1262)Aroclor‐1268 (PCB‐1268)Total PCBs PEST (mg/kg)
4,4'‐DDD
4,4'‐DDE
4,4'‐DDT
Aldrinalpha‐BHC
beta‐BHC
Chlordanedelta‐BHC
DieldrinEndosulfan I
Endosulfan II
Endosulfan sulfate
EndrinEndrin aldehydeEndrin ketonegamma‐BHC (Lindane)
HeptachlorHeptachlor epoxide
MethoxychlorToxaphene
B29‐03A B29‐03A B29‐03B B29‐03B B29‐04 B29‐04 B29‐05 B29‐05 B29‐05A B29‐05A B29‐05B B29‐05B B29‐05C B29‐05C B29‐03A‐010 B29‐03A‐030 B29‐03B‐010 B29‐03B‐030 B29‐04‐1 B29‐04‐5 B29‐05‐2 B29‐05‐5 B29‐05A‐020 B29‐05A‐030 B29‐05B‐020 B29‐05B‐030 B29‐05C‐020 B29‐05C‐030 1/10/2020 1/10/2020 1/10/2020 1/10/2020 6/27/2016 6/27/2016 6/28/2016 6/28/2016 1/10/2020 1/10/2020 1/10/2020 1/10/2020 1/10/2020 1/10/2020

0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 4.5 ‐ 5 (ft) 1.5 ‐ 2 (ft) 4.5 ‐ 5 (ft) 1.5 ‐ 2 (ft) 2.5 ‐ 3 (ft) 1.5 ‐ 2 (ft) 2.5 ‐ 3 (ft) 1.5 ‐ 2 (ft) 2.5 ‐ 3 (ft) ‐‐‐‐ < 0.145 < 0.154 1.18 < 0.156 ‐‐‐‐‐‐

20.4 1.44 J 21.9 1.1 J 2.7 5.07 4.59 2.85 ‐‐‐‐‐‐
‐‐‐‐ 71.6 66.2 50.4 44.5 ‐‐‐‐‐‐
‐‐‐‐ 0.269 0.295 0.168 J 0.335 ‐‐‐‐‐‐
‐‐‐‐ 0.37 J 0.333 J 0.401 J 0.287 J ‐‐‐‐‐‐
‐‐‐‐ 13.7 9.24 8.14 12.3 ‐‐‐‐‐‐‐‐‐‐ 8.77 5.93 4.55 8.81 ‐‐‐‐‐‐‐‐‐‐ 17.1 10.9 23.8 10.7 ‐‐‐‐‐‐‐‐‐‐ 7.6 4.82 17.5 6.34 ‐‐‐‐‐‐‐‐‐‐ 0.0133 J < 0.00559 0.0198 J 0.0132 J ‐‐‐‐‐‐ ‐‐‐‐ < 0.128 0.352 0.851 < 0.138 ‐‐‐‐‐‐
‐‐‐‐ 6.27 7.78 7.18 6.32 ‐‐‐‐‐‐‐‐‐‐ 0.387 J < 0.31 < 0.3 0.643 J ‐‐‐‐‐‐ ‐‐‐‐ < 0.0832 < 0.0888 < 0.0857 < 0.0897 ‐‐‐‐‐‐
‐‐‐‐ < 0.147 < 0.157 < 0.152 < 0.159 ‐‐‐‐‐‐
‐‐‐‐ 40.5 32.3 19.5 37.9 ‐‐‐‐‐‐
‐‐‐‐ 25.6 30.5 30.7 23.9 ‐‐‐‐‐‐‐‐‐‐ < 0.021 < 0.021 < 0.021 < 0.021 < 0.0035 < 0.0035 < 0.0035 < 0.0035 < 0.0035 < 0.0035 ‐‐‐‐ < 0.042 < 0.042 < 0.042 < 0.043 < 0.00537 < 0.00537 < 0.00537 < 0.00537 < 0.00537 < 0.00537 ‐‐‐‐ < 0.025 < 0.025 < 0.025 < 0.025 < 0.00417 < 0.00417 < 0.00417 < 0.00417 < 0.00417 < 0.00417 ‐‐‐‐ < 0.037 < 0.037 < 0.037 < 0.037 < 0.00318 < 0.00318 < 0.00318 < 0.00318 < 0.00318 < 0.00318 ‐‐‐‐ < 0.032 < 0.032 < 0.032 < 0.032 < 0.00315 < 0.00315 < 0.00315 < 0.00315 < 0.00315 < 0.00315 ‐‐‐‐ < 0.032 < 0.032 < 0.032 < 0.032 < 0.00472 < 0.00472 < 0.00472 < 0.00472 < 0.00472 < 0.00472 ‐‐‐‐ < 0.03 < 0.03 1.3 < 0.031 0.0997 0.00566 J 0.127 < 0.00494 0.0132 J 0.0129 J ‐‐‐‐ < 0.035 < 0.035 < 0.035 < 0.035 ‐‐‐‐‐‐
‐‐‐‐ < 0.033 < 0.033 < 0.033 < 0.034 ‐‐‐‐‐‐
‐‐‐‐ < 0.042 < 0.042 1.3 < 0.043 0.0997 0.00566 0.127 < 0.00537 0.0132 0.0129 ‐‐‐‐‐‐ < 0.0024 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0022 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ 0.021 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0022 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0037 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0025 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.026 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0044 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0022 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.002 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0024 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0026 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0024 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.003 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0025 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0022 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0022 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0037 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0027 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.045 ‐‐‐‐‐‐‐
HALEY & ALDRICH, INC.
02_2022_07_HAI_T02_B29_ParcelA_SO_Vadose_REV1.xlsx
JULY 2022
TABLE A‐2
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 29 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

LocationSample Name
Sample Date
Sample Depth (bgs)
SVOCs (mg/kg)
AcenaphtheneAcenaphthyleneAnthraceneBenzo(a)anthraceneBenzo(a)pyreneBenzo(b)fluorantheneBenzo(g,h,i)peryleneBenzo(k)fluorantheneChryseneDibenz(a,h)anthraceneDimethyl phthalateFluorantheneFluoreneIndeno(1,2,3‐cd)pyrene PhenanthrenePyrene
VOCs (mg/kg)
1,1,1‐Trichloroethane
1,2,3‐Trimethylbenzene
1,2,4‐Trimethylbenzene
1,3,5‐Trimethylbenzene
2‐Butanone (Methyl Ethyl Ketone)
AcetoneBenzeneChloroform (Trichloromethane)cis‐1,2‐Dichloroethene Cymene (p‐Isopropyltoluene)
Methyl Tert Butyl Ether
Methylene chlorideNaphthalenen‐Butylbenzene
Tetrachloroethenetrans‐1,2‐Dichloroethene
Trichloroethene
Notes and Abbreviations:

BOLD = concentration detected at or above
reported detection limit.

Detected VOCs and SVOCs are shown.
< = analyte not detected above the indicated
reporting limit.

B = compound detected in the associated blank
J = estimated concentration.
‐ = not analyzed or not applicable.
mg/kg = milligrams per kilogram.
bgs = below ground surface.

B29‐03A B29‐03A B29‐03B B29‐03B B29‐04 B29‐04 B29‐05 B29‐05 B29‐05A B29‐05A B29‐05B B29‐05B B29‐05C B29‐05C B29‐03A‐010 B29‐03A‐030 B29‐03B‐010 B29‐03B‐030 B29‐04‐1 B29‐04‐5 B29‐05‐2 B29‐05‐5 B29‐05A‐020 B29‐05A‐030 B29‐05B‐020 B29‐05B‐030 B29‐05C‐020 B29‐05C‐030 1/10/2020 1/10/2020 1/10/2020 1/10/2020 6/27/2016 6/27/2016 6/28/2016 6/28/2016 1/10/2020 1/10/2020 1/10/2020 1/10/2020 1/10/2020 1/10/2020

0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 4.5 ‐ 5 (ft) 1.5 ‐ 2 (ft) 4.5 ‐ 5 (ft) 1.5 ‐ 2 (ft) 2.5 ‐ 3 (ft) 1.5 ‐ 2 (ft) 2.5 ‐ 3 (ft) 1.5 ‐ 2 (ft) 2.5 ‐ 3 (ft) ‐‐‐‐‐‐ < 0.0041 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0042 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ 0.0075 J ‐‐‐‐‐‐‐
‐‐‐‐‐‐ 0.008 J ‐‐‐‐‐‐‐
‐‐‐‐‐‐ 0.016 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ 0.018 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0018 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ 0.025 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ 0.016 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.003 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.56 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ 0.12 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0017 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ < 0.0022 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ 0.045 ‐‐‐‐‐‐‐
‐‐‐‐‐‐ 0.029 ‐‐‐‐‐‐‐
‐‐‐‐ < 0.00022 < 0.00023 < 0.00023 < 0.00023 ‐‐‐‐‐‐
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ < 0.00058 < 0.00059 < 0.0006 < 0.00059 ‐‐‐‐‐‐ ‐‐‐‐ < 0.00054 < 0.00055 < 0.00056 < 0.00056 ‐‐‐‐‐‐
‐‐‐‐ < 0.0037 < 0.0038 < 0.0039 < 0.0038 ‐‐‐‐‐‐
‐‐‐‐ < 0.0062 < 0.0063 < 0.0064 < 0.0063 ‐‐‐‐‐‐
‐‐‐‐ < 0.00013 < 0.00013 < 0.00013 < 0.00013 ‐‐‐‐‐‐
‐‐‐‐ < 0.00024 < 0.00024 0.0005 J 0.00079 J ‐‐‐‐‐‐
‐‐‐‐ < 0.00028 < 0.00028 < 0.00029 < 0.00028 ‐‐‐‐‐‐
‐‐‐‐ < 0.00062 < 0.00063 < 0.00065 < 0.00064 ‐‐‐‐‐‐
‐‐‐‐ < 0.00029 < 0.0003 < 0.0003 < 0.0003 ‐‐‐‐‐‐
‐‐‐‐ < 0.0013 < 0.0013 < 0.0014 < 0.0014 ‐‐‐‐‐‐
‐‐‐‐ < 0.00081 < 0.00082 < 0.00084 < 0.00082 ‐‐‐‐‐‐
‐‐‐‐ < 0.00015 < 0.00016 < 0.00016 < 0.00016 ‐‐‐‐‐‐
‐‐‐‐ < 0.00021 < 0.00021 < 0.00022 < 0.00021 ‐‐‐‐‐‐
‐‐‐‐ < 0.0005 < 0.00051 < 0.00052 < 0.00051 ‐‐‐‐‐‐
‐‐‐‐ < 0.0003 < 0.0003 0.015 0.014 ‐‐‐‐‐‐
HALEY & ALDRICH, INC.
02_2022_07_HAI_T02_B29_ParcelA_SO_Vadose_REV1.xlsx
JULY 2022
TABLE A‐2
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 29 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

LocationSample Name
Sample Date
Sample Depth (bgs)
Metals (mg/kg)
AntimonyArsenicBariumBerylliumCadmiumChromiumCobaltCopperLeadMercuryMolybdenumNickelSeleniumSilverThalliumVanadiumZinc PCBs (mg/kg)
Aroclor‐1016 (PCB‐1016)
Aroclor‐1221 (PCB‐1221)Aroclor‐1232 (PCB‐1232)Aroclor‐1242 (PCB‐1242)Aroclor‐1248 (PCB‐1248)Aroclor‐1254 (PCB‐1254)Aroclor‐1260 (PCB‐1260)Aroclor‐1262 (PCB‐1262)Aroclor‐1268 (PCB‐1268)Total PCBs PEST (mg/kg)
4,4'‐DDD
4,4'‐DDE
4,4'‐DDT
Aldrinalpha‐BHC
beta‐BHC
Chlordanedelta‐BHC
DieldrinEndosulfan I
Endosulfan II
Endosulfan sulfate
EndrinEndrin aldehydeEndrin ketonegamma‐BHC (Lindane)
HeptachlorHeptachlor epoxide
MethoxychlorToxaphene
B29‐06 B29‐06 B29‐07 B29‐07 B29‐07A B29‐07A B29‐07B B29‐07B B29‐08 B29‐08 B29‐09 B29‐09 B29‐10 B29‐10 B29‐06‐1 B29‐06‐5 B29‐07‐1 B29‐07‐3 B29‐07A‐010 B29‐07A‐030 B29‐07B‐010 B29‐07B‐030 B29‐08‐1 B29‐08‐5 B29‐09‐1 B29‐09‐5 B29‐10‐1 B29‐10‐5 6/29/2016 6/29/2016 6/29/2016 6/29/2016 1/10/2020 1/10/2020 1/10/2020 1/10/2020 6/28/2016 6/28/2016 6/29/2016 6/29/2016 6/28/2016 6/28/2016

0.5 ‐ 1 (ft) 4.5 ‐ 5 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 4.5 ‐ 5 (ft) 0.5 ‐ 1 (ft) 4.5 ‐ 5 (ft) 0.5 ‐ 1 (ft) 4.5 ‐ 5 (ft) < 0.145 < 0.145 < 0.143 < 0.145 ‐‐‐‐ < 0.144 < 0.147 0.208 J < 0.154 < 0.143 < 0.15

2.02 4.86 21.8 2.86 24.6 1.98 J 22 1.63 J 2.16 4.56 5.76 1.27 5.81 2.25

71.6 48.8 130 73.1 ‐‐‐‐ 55.4 37.3 37.2 52.1 58.9 197

0.395 0.257 0.404 0.401 ‐‐‐‐ 0.364 0.407 0.228 J 0.227 J 0.232 J 0.494

0.306 J 0.473 J 0.262 J 0.385 J ‐‐‐‐ 0.236 J 0.295 J 0.398 J 0.175 J 0.908 0.283 J 16 11.8 7 16 ‐‐‐‐ 11.3 13.5 11.2 8.04 10.7 14.7

9.87 6.88 2.71 5.5 ‐‐‐‐ 8.91 6.27 6.53 5.7 6.21 7.958.32 21.8 6.97 8.18 ‐‐‐‐ 5.75 10.2 23.1 3.05 35.4 6.494.92 12.5 7.82 3.58 ‐‐‐‐ 4.93 8.29 13 3.02 21.7 4.57

0.00779 J 0.0357 J < 0.00587 0.0102 J ‐‐‐‐ 0.0203 J 0.0168 J 0.0233 J < 0.00559 0.0515 J 0.0114 J < 0.128 0.219 J 0.221 J < 0.129 ‐‐‐‐ < 0.128 < 0.13 0.143 J < 0.137 0.275 < 0.133

8.88 6.35 4.59 6.28 ‐‐‐‐ 8.18 6.84 4.67 4.33 7.41 7.73
< 0.291 0.516 J 0.753 < 0.292 ‐‐‐‐ < 0.289 < 0.295 < 0.295 0.334 J < 0.287 < 0.301 < 0.0832 < 0.0832 < 0.0824 < 0.0836 ‐‐‐‐ < 0.0828 < 0.0844 < 0.0844 < 0.0888 < 0.082 < 0.0861 < 0.147 < 0.147 0.338 J 0.376 J ‐‐‐‐ 0.168 J 0.173 J 0.488 J 0.172 J < 0.145 0.409 J

46.4 32.8 16.6 44.5 ‐‐‐‐ 33.3 34.3 27.2 26.7 26.9 39.3
31 47.5 33.9 29.4 ‐‐‐‐ 20.8 25.4 31.8 13.7 53.1 28.9
< 0.021 < 0.021 < 0.021 < 0.021 ‐‐‐‐ < 0.021 < 0.021 < 0.021 < 0.021 < 0.021 < 0.021 < 0.042 < 0.042 < 0.042 < 0.042 ‐‐‐‐ < 0.042 < 0.042 < 0.042 < 0.042 < 0.042 < 0.042 < 0.025 < 0.025 < 0.025 < 0.025 ‐‐‐‐ < 0.025 < 0.025 < 0.025 < 0.025 < 0.025 < 0.025 < 0.037 < 0.037 < 0.037 < 0.037 ‐‐‐‐ < 0.037 < 0.037 < 0.037 < 0.037 < 0.037 < 0.037 < 0.032 < 0.032 < 0.032 < 0.032 ‐‐‐‐ < 0.032 < 0.032 < 0.032 < 0.032 < 0.032 < 0.032 < 0.032 < 0.032 < 0.032 < 0.031 ‐‐‐‐ < 0.031 < 0.032 < 0.031 < 0.032 < 0.031 < 0.032 < 0.03 < 0.03 < 0.03 < 0.03 ‐‐‐‐ 0.17 0.036 J < 0.03 < 0.03 < 0.03 < 0.03 < 0.035 < 0.035 < 0.035 < 0.034 ‐‐‐‐ < 0.034 < 0.035 < 0.034 < 0.035 < 0.034 < 0.035 < 0.033 < 0.033 < 0.033 < 0.033 ‐‐‐‐ < 0.033 < 0.033 < 0.033 < 0.033 < 0.033 < 0.033 < 0.042 < 0.042 < 0.042 < 0.042 ‐‐‐‐ 0.17 0.036 < 0.042 < 0.042 < 0.042 < 0.042 ‐‐ < 0.0024 ‐‐‐‐‐‐‐ < 0.0023 ‐‐‐
‐‐ < 0.0022 ‐‐‐‐‐‐‐ < 0.0022 ‐‐‐
‐‐ < 0.0022 ‐‐‐‐‐‐‐ < 0.0022 ‐‐‐
‐‐ < 0.0022 ‐‐‐‐‐‐‐ < 0.0022 ‐‐‐
‐‐ < 0.0037 ‐‐‐‐‐‐‐ < 0.0037 ‐‐‐
‐‐ < 0.0025 ‐‐‐‐‐‐‐ < 0.0025 ‐‐‐
‐‐ < 0.026 ‐‐‐‐‐‐‐ < 0.026 ‐‐‐
‐‐ < 0.0044 ‐‐‐‐‐‐‐ < 0.0044 ‐‐‐
‐‐ < 0.0022 ‐‐‐‐‐‐‐ < 0.0022 ‐‐‐
‐‐ < 0.002 ‐‐‐‐‐‐‐ < 0.002 ‐‐‐
‐‐ < 0.0024 ‐‐‐‐‐‐‐ < 0.0023 ‐‐‐
‐‐ < 0.0026 ‐‐‐‐‐‐‐ < 0.0026 ‐‐‐
‐‐ < 0.0024 ‐‐‐‐‐‐‐ < 0.0023 ‐‐‐
‐‐ < 0.003 ‐‐‐‐‐‐‐ < 0.003 ‐‐‐
‐‐ < 0.0025 ‐‐‐‐‐‐‐ < 0.0025 ‐‐‐
‐‐ < 0.0022 ‐‐‐‐‐‐‐ < 0.0022 ‐‐‐
‐‐ < 0.0022 ‐‐‐‐‐‐‐ < 0.0021 ‐‐‐
‐‐ < 0.0037 ‐‐‐‐‐‐‐ < 0.0037 ‐‐‐
‐‐ < 0.0027 ‐‐‐‐‐‐‐ < 0.0027 ‐‐‐
‐‐ < 0.045 ‐‐‐‐‐‐‐ < 0.044 ‐‐‐
HALEY & ALDRICH, INC.
02_2022_07_HAI_T02_B29_ParcelA_SO_Vadose_REV1.xlsx
JULY 2022
TABLE A‐2
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 29 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

LocationSample Name
Sample Date
Sample Depth (bgs)
SVOCs (mg/kg)
AcenaphtheneAcenaphthyleneAnthraceneBenzo(a)anthraceneBenzo(a)pyreneBenzo(b)fluorantheneBenzo(g,h,i)peryleneBenzo(k)fluorantheneChryseneDibenz(a,h)anthraceneDimethyl phthalateFluorantheneFluoreneIndeno(1,2,3‐cd)pyrene PhenanthrenePyrene
VOCs (mg/kg)
1,1,1‐Trichloroethane
1,2,3‐Trimethylbenzene
1,2,4‐Trimethylbenzene
1,3,5‐Trimethylbenzene
2‐Butanone (Methyl Ethyl Ketone)
AcetoneBenzeneChloroform (Trichloromethane)cis‐1,2‐Dichloroethene Cymene (p‐Isopropyltoluene)
Methyl Tert Butyl Ether
Methylene chlorideNaphthalenen‐Butylbenzene
Tetrachloroethenetrans‐1,2‐Dichloroethene
Trichloroethene
Notes and Abbreviations:

BOLD = concentration detected at or above
reported detection limit.

Detected VOCs and SVOCs are shown.
< = analyte not detected above the indicated
reporting limit.

B = compound detected in the associated blank
J = estimated concentration.
‐ = not analyzed or not applicable.
mg/kg = milligrams per kilogram.
bgs = below ground surface.

B29‐06 B29‐06 B29‐07 B29‐07 B29‐07A B29‐07A B29‐07B B29‐07B B29‐08 B29‐08 B29‐09 B29‐09 B29‐10 B29‐10 B29‐06‐1 B29‐06‐5 B29‐07‐1 B29‐07‐3 B29‐07A‐010 B29‐07A‐030 B29‐07B‐010 B29‐07B‐030 B29‐08‐1 B29‐08‐5 B29‐09‐1 B29‐09‐5 B29‐10‐1 B29‐10‐5 6/29/2016 6/29/2016 6/29/2016 6/29/2016 1/10/2020 1/10/2020 1/10/2020 1/10/2020 6/28/2016 6/28/2016 6/29/2016 6/29/2016 6/28/2016 6/28/2016

0.5 ‐ 1 (ft) 4.5 ‐ 5 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 4.5 ‐ 5 (ft) 0.5 ‐ 1 (ft) 4.5 ‐ 5 (ft) 0.5 ‐ 1 (ft) 4.5 ‐ 5 (ft)

0.028 ‐ < 0.004 ‐‐‐‐‐‐ < 0.32 < 0.063 ‐ < 0.31 ‐

0.015 J ‐ < 0.0042 ‐‐‐‐‐‐ < 0.3 < 0.06 ‐ < 0.3 ‐
< 0.002 ‐ < 0.002 ‐‐‐‐‐‐ < 0.32 < 0.063 ‐ < 0.31 ‐
< 0.0024 ‐ < 0.0025 ‐‐‐‐‐‐ < 0.28 < 0.057 ‐ < 0.28 ‐

0.02 ‐ 0.011 ‐‐‐‐‐‐ < 0.27 < 0.054 ‐ < 0.27 ‐

0.017 ‐ 0.01 ‐‐‐‐‐‐ < 0.32 < 0.064 ‐ < 0.32 ‐

0.014 ‐ 0.026 ‐‐‐‐‐‐ < 0.28 < 0.055 ‐ < 0.27 ‐

0.11 ‐ 0.032 ‐‐‐‐‐‐ < 0.32 < 0.065 ‐ < 0.32 ‐

0.0025 J ‐ < 0.0021 ‐‐‐‐‐‐ < 0.32 < 0.064 ‐ < 0.32 ‐
< 0.0029 ‐ < 0.0029 ‐‐‐‐‐‐ < 0.23 < 0.046 ‐ < 0.23 ‐
‐‐ < 0.56 ‐‐‐‐‐‐ < 0.57 < 0.11 ‐ < 0.56 ‐
< 0.0021 ‐ < 0.0021 ‐‐‐‐‐‐ < 0.31 < 0.062 ‐ < 0.31 ‐

0.0034 J ‐ < 0.0017 ‐‐‐‐‐‐ < 0.32 < 0.063 ‐ < 0.31 ‐
< 0.0022 ‐ < 0.0022 ‐‐‐‐‐‐ < 0.27 < 0.053 ‐ < 0.26 ‐
< 0.0021 ‐ < 0.0021 ‐‐‐‐‐‐ < 0.34 < 0.069 ‐ < 0.34 ‐

0.01 ‐ < 0.0029 ‐‐‐‐‐‐ < 0.38 < 0.077 ‐ < 0.38 ‐
< 0.00023 < 0.00022 < 0.00023 < 0.00023 ‐‐‐‐ < 0.00023 < 0.00024 < 0.00022 < 0.00022 < 0.00023 < 0.00023 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐
< 0.0006 < 0.00057 < 0.0006 < 0.00061 ‐‐‐‐ < 0.00059 < 0.00061 < 0.00058 < 0.00058 < 0.00061 < 0.00059 < 0.00056 < 0.00053 < 0.00056 < 0.00057 ‐‐‐‐ < 0.00055 < 0.00058 < 0.00054 < 0.00054 < 0.00057 < 0.00055 < 0.0038 < 0.0037 < 0.0039 < 0.0039 ‐‐‐‐ < 0.0038 < 0.004 < 0.0037 < 0.0037 < 0.0039 < 0.0038 < 0.0063 < 0.0061 < 0.0064 < 0.0065 ‐‐‐‐ < 0.0063 < 0.0065 < 0.0062 < 0.0062 < 0.0065 < 0.0063 < 0.00013 < 0.00013 < 0.00013 < 0.00013 ‐‐‐‐ < 0.00013 < 0.00014 < 0.00013 < 0.00013 < 0.00013 < 0.00013 < 0.00024 < 0.00023 < 0.00024 < 0.00025 ‐‐‐‐ < 0.00024 < 0.00025 < 0.00024 < 0.00024 < 0.00025 < 0.00024 < 0.00028 < 0.00027 < 0.00029 < 0.00029 ‐‐‐‐ < 0.00028 < 0.00029 < 0.00028 < 0.00028 < 0.00029 < 0.00028 < 0.00064 < 0.00061 < 0.00064 < 0.00065 ‐‐‐‐ < 0.00064 < 0.00066 < 0.00062 < 0.00062 < 0.00065 < 0.00063 < 0.0003 < 0.00029 < 0.0003 < 0.00031 ‐‐‐‐ < 0.0003 < 0.00031 < 0.00029 < 0.00029 < 0.00031 < 0.0003 < 0.0014 < 0.0013 < 0.0014 < 0.0014 ‐‐‐‐ < 0.0014 < 0.0014 < 0.0013 < 0.0013 < 0.0014 < 0.0013 < 0.00083 < 0.00079 < 0.00083 < 0.00084 ‐‐‐‐ < 0.00082 < 0.00085 < 0.00081 < 0.00081 < 0.00084 < 0.00082 < 0.00016 < 0.00015 < 0.00016 < 0.00016 ‐‐‐‐ < 0.00016 < 0.00016 < 0.00016 < 0.00016 < 0.00016 < 0.00016 < 0.00021 < 0.0002 < 0.00021 < 0.00022 ‐‐‐‐ < 0.00021 < 0.00022 < 0.00021 < 0.00021 < 0.00022 < 0.00021 < 0.00051 < 0.00049 < 0.00052 < 0.00052 ‐‐‐‐ < 0.00051 < 0.00053 < 0.0005 < 0.0005 < 0.00052 < 0.00051 < 0.00031 < 0.00029 < 0.00031 < 0.00031 ‐‐‐‐ < 0.0003 < 0.00032 < 0.0003 < 0.0003 < 0.00031 < 0.0003 HALEY & ALDRICH, INC.
02_2022_07_HAI_T02_B29_ParcelA_SO_Vadose_REV1.xlsx
JULY 2022
TABLE A‐2
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 29 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA

LocationSample Name
Sample Date
Sample Depth (bgs)
Metals (mg/kg)
AntimonyArsenicBariumBerylliumCadmiumChromiumCobaltCopperLeadMercuryMolybdenumNickelSeleniumSilverThalliumVanadiumZinc PCBs (mg/kg)
Aroclor‐1016 (PCB‐1016)
Aroclor‐1221 (PCB‐1221)Aroclor‐1232 (PCB‐1232)Aroclor‐1242 (PCB‐1242)Aroclor‐1248 (PCB‐1248)Aroclor‐1254 (PCB‐1254)Aroclor‐1260 (PCB‐1260)Aroclor‐1262 (PCB‐1262)Aroclor‐1268 (PCB‐1268)Total PCBs PEST (mg/kg)
4,4'‐DDD
4,4'‐DDE
4,4'‐DDT
Aldrinalpha‐BHC
beta‐BHC
Chlordanedelta‐BHC
DieldrinEndosulfan I
Endosulfan II
Endosulfan sulfate
EndrinEndrin aldehydeEndrin ketonegamma‐BHC (Lindane)
HeptachlorHeptachlor epoxide
MethoxychlorToxaphene
B29‐11 B29‐11 B29‐12 B29‐12 B29‐13 B29‐13 B29‐14 B29‐14 B29‐15 B29‐15 B29‐16 B29‐16 B29‐17 B29‐17 B29‐11‐1 B29‐11‐5 B29‐12‐1 B29‐12‐5 B29‐13‐4 B29‐13‐5 B29‐14‐1.5 B29‐14‐3 B29‐15‐1 B29‐15‐3 B29‐16‐1 B29‐16‐3 B29‐17‐1 B29‐17‐3 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/28/2016 6/29/2016 6/29/2016 6/29/2016 6/29/2016 6/28/2016 6/28/2016 6/29/2016 6/29/2016

0.5 ‐ 1 (ft) 4.5 ‐ 5 (ft) 0.5 ‐ 1 (ft) 4.5 ‐ 5 (ft) 3.5 ‐ 4 (ft) 4.5 ‐ 5 (ft) 1 ‐ 1.5 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) 0.5 ‐ 1 (ft) 2.5 ‐ 3 (ft) < 0.154 < 0.148 0.226 J < 0.145 < 0.154 < 0.154 < 0.147 0.294 J < 0.148 < 0.146 < 0.152 < 0.144 < 0.148 < 0.147

2.12 4.59 1.45 1.75 3.85 3.16 1.29 2.31 5.18 2.39 2.73 1.25 2.96 2.5896.1 26.5 57.8 72 143 54.3 30.9 34.4 18.4 43.9 56 36.8 55.1 43.5

0.391 0.183 J 0.154 J 0.526 0.352 0.399 0.276 0.564 < 0.136 0.523 0.253 J 0.161 J 0.242 J 0.627

0.278 J 0.252 J 0.215 J 0.264 J 0.372 J 0.327 J 0.245 J 0.285 J 0.356 J 0.263 J 0.3 J 0.172 J 0.275 J 0.336 J

12.1 8.02 6.5 13.2 12.4 14.5 10 16 5.92 15.9 11.4 7.17 10.2 15.37.98 5.28 6.2 8.32 7.11 6.24 4.97 6.94 18 8.14 5.79 3.94 5.02 9.085.97 12.6 5.9 6.56 4.83 5.56 2.8 5.78 9.26 42.1 4.62 4.76 5.37 5.744.79 9.33 4.97 5.28 2.45 3.57 2.25 5.48 1.87 4.84 2.53 1.98 5.65 5.95

0.00706 J 0.0115 J 0.0065 J 0.0181 J 0.0122 J 0.00769 J < 0.00559 0.00897 J 0.00562 J 0.0161 J < 0.00597 < 0.00597 0.00586 J 0.0177 J < 0.137 < 0.131 0.201 J < 0.129 < 0.137 < 0.137 < 0.131 < 0.13 < 0.131 < 0.129 < 0.135 < 0.128 < 0.131 < 0.13

8.08 3.56 7.28 8.53 6.24 6.25 4.12 8.93 3.02 9.46 4.54 2.94 4.03 9.63 < 0.31 0.4 J < 0.3 < 0.292 0.804 < 0.31 0.307 J < 0.295 0.885 < 0.294 < 0.306 < 0.289 < 0.298 0.389 J < 0.0888 < 0.0853 < 0.0857 < 0.0836 < 0.0888 < 0.0888 < 0.0849 < 0.0844 0.414 < 0.084 < 0.0875 < 0.0828 < 0.0853 < 0.0844 < 0.157 < 0.151 < 0.152 0.314 J 0.248 J < 0.157 < 0.15 < 0.149 0.285 J 0.358 J 0.243 J < 0.147 < 0.151 0.39 J

35.6 20.2 29.7 34.9 39.1 41 39.4 37.5 21.9 40.9 37.8 25.9 33.7 36.424.1 16 24.5 28.1 20.3 23.8 27 29 36.5 34.5 29.3 14.2 27.7 27.3 < 0.021 < 0.021 < 0.021 < 0.021 < 0.021 < 0.021 < 0.021 < 0.021 < 0.021 < 0.021 < 0.021 < 0.021 < 0.021 < 0.021 < 0.042 < 0.042 < 0.042 < 0.042 < 0.042 < 0.042 < 0.042 < 0.042 < 0.042 < 0.043 < 0.042 < 0.043 < 0.042 < 0.042 < 0.025 < 0.025 < 0.025 < 0.025 < 0.025 < 0.025 < 0.025 < 0.025 < 0.025 < 0.025 < 0.025 < 0.025 < 0.025 < 0.025 < 0.037 < 0.037 < 0.037 < 0.037 < 0.037 < 0.037 < 0.037 < 0.037 < 0.037 < 0.037 < 0.037 < 0.038 < 0.037 < 0.037 < 0.032 < 0.032 < 0.032 < 0.032 < 0.032 < 0.032 < 0.032 < 0.032 < 0.032 < 0.032 < 0.032 < 0.032 < 0.032 < 0.032 < 0.031 < 0.032 < 0.031 < 0.032 < 0.032 < 0.032 < 0.031 < 0.032 < 0.032 < 0.032 < 0.032 < 0.032 < 0.031 < 0.032 < 0.03 < 0.03 < 0.03 < 0.03 < 0.03 < 0.03 < 0.03 < 0.03 < 0.03 < 0.031 < 0.03 < 0.031 < 0.03 < 0.03 < 0.034 < 0.035 < 0.034 < 0.035 < 0.035 < 0.035 < 0.034 < 0.035 < 0.035 < 0.035 < 0.035 < 0.035 < 0.034 < 0.035 < 0.033 < 0.033 < 0.033 < 0.033 < 0.033 < 0.033 < 0.033 < 0.033 < 0.033 < 0.034 < 0.033 < 0.034 < 0.033 < 0.033 < 0.042 < 0.042 < 0.042 < 0.042 < 0.042 < 0.042 < 0.042 < 0.042 < 0.042 < 0.043 < 0.042 < 0.043 < 0.042 < 0.042 ‐‐ < 0.0023 ‐ < 0.0024 ‐ < 0.0023 ‐‐‐‐‐‐‐
‐‐ < 0.0022 ‐ < 0.0022 ‐ < 0.0022 ‐‐‐‐‐‐‐
‐‐ < 0.0022 ‐ < 0.0022 ‐ < 0.0022 ‐‐‐‐‐‐‐
‐‐ < 0.0022 ‐ < 0.0022 ‐ < 0.0022 ‐‐‐‐‐‐‐
‐‐ < 0.0037 ‐ < 0.0037 ‐ < 0.0037 ‐‐‐‐‐‐‐
‐‐ < 0.0025 ‐ < 0.0025 ‐ < 0.0025 ‐‐‐‐‐‐‐
‐‐ < 0.026 ‐ < 0.026 ‐ < 0.026 ‐‐‐‐‐‐‐
‐‐ < 0.0044 ‐ < 0.0044 ‐ < 0.0044 ‐‐‐‐‐‐‐
‐‐ < 0.0022 ‐ < 0.0022 ‐ < 0.0022 ‐‐‐‐‐‐‐
‐‐ < 0.002 ‐ < 0.002 ‐ < 0.002 ‐‐‐‐‐‐‐
‐‐ < 0.0023 ‐ < 0.0023 ‐ < 0.0023 ‐‐‐‐‐‐‐
‐‐ < 0.0026 ‐ < 0.0026 ‐ < 0.0026 ‐‐‐‐‐‐‐
‐‐ < 0.0023 ‐ < 0.0023 ‐ < 0.0023 ‐‐‐‐‐‐‐
‐‐ < 0.003 ‐ < 0.003 ‐ < 0.003 ‐‐‐‐‐‐‐
‐‐ < 0.0025 ‐ < 0.0025 ‐ < 0.0025 ‐‐‐‐‐‐‐
‐‐ < 0.0022 ‐ < 0.0022 ‐ < 0.0022 ‐‐‐‐‐‐‐
‐‐ < 0.0021 ‐ < 0.0022 ‐ < 0.0021 ‐‐‐‐‐‐‐
‐‐ < 0.0037 ‐ < 0.0037 ‐ < 0.0037 ‐‐‐‐‐‐‐
‐‐ < 0.0027 ‐ < 0.0027 ‐ < 0.0027 ‐‐‐‐‐‐‐
‐‐ < 0.044 ‐ < 0.045 ‐ < 0.044 ‐‐‐‐‐‐‐
HALEY & ALDRICH, INC.
02_2022_07_HAI_T02_B29_ParcelA_SO_Vadose_REV1.xlsx
JULY 2022
TABLE A‐2
SUMMARY OF SOIL QUALITY DATA ‐ BUILDING 29 EXPOSURE AREA ROHR, INC. ‐ PARCEL A

CHULA VISTA, CALIFORNIA