Site Inspection Report

Central Metal
Huntington Park, Los Angeles County, California

EPA ID No.: CAN000903324
USAGE Contract Number: W912P7-16-D-0001
Document Control Number: 12767.900.004.2000.02

Prepared for:

U.S. ENVIRONMENTAL PROTECTION AGENCY
REGION 9

Prepared by:

WESTON SOLUTIONS, INC.

2300 Clayton Road, Suite 900
Concord, CA 94520

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CAN000903324	TABLE OF CONTENTS

TABLE OF CONTENTS

Section	Page

EXECUTIVE SUMMARY	ES-1

1.	INTRODUCTION	1

1.1	EPA Regul atory Authority	1

1.2	EPA Regul atory Hi story	1

1.3	Apparent Problem	2

2.	SITE DESCRIPTION	4

2.1	Location and Description	4

2.2	Operational and Regulatory History	6

2.2.1	Operational History	6

2.2.2	State and Local Regul atory Hi story	8

2.2.2.1	State of California	8

2.2.2.2	County of Los Angeles	9

3.	INVESTIGATIVE EFFORTS	11

3.1	Previous Investigations	11

3.1.1	Non-Regulatory Investigations	11

3.1.1.1	2000 Subsurface Soil Investigation	11

3.1.1.2	2001 CMI Subsurface Soil Investigation	11

3.1.1.3	2003 CMI Subsurface Soil Investigation	11

3.1.1.4	2004 CMI Subsurface Soil Investigation	12

3.1.1.5	2010 CMI Debris Pile Classification Sampling	12

3.1.1.6	2021 CMI Phase II Sampling	12

3.1.2	State and Local Regulatory Agency Investigations	13

3.1.2.1	2011 DTSC Debris Pile Sampling Investigation	13

3.1.2.2	2017-2018 CUPA Debris Pile Investigation	14

3.1.3	Previous Federal Regulatory Agency Investigations	14

3.2	Site Inspection (SI) Sampling	14

3.2.1	Action Levels	16

3.2.1.1	Source Action Level	16

3.2.1.2	Groundwater Release Action Level	17

3.2.1.3	HRS Soil Screening Benchmark	17

3.2.2	2019 EPA Stage 1 SI - Soil Vapor and Limited Soil Sampling	17

3.2.2.1	Stage 1 Soil Vapor Results for VOCs	18

3.2.2.2	Stage 1 Soil Sampling Results for Metals	19

3.2.3	2019 EPA Stage 2 SI - Soil and Groundwater Sampling	20

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3.2.3.1	Stage 2 Sampling Results for VOCs	21

3.2.3.2	Stage 2 Sampling Results for Metals	22

3.2.4 2022 EPA Stage 3 SI - Residential Soil Sampling	23

3.2.4.1	Stage 3 SI - Residential Phase	23

3.2.4.2	Stage 3 SI - Background Phase	27

4.	HAZARD RANKING SYSTEM FACTORS	28

4.1	Sources of Contamination	28

4.2	Groundwater Pathway	29

4.2.1	Hydrogeological Setting	29

4.2.2	Groundwater Targets	32

4.2.3	Groundwater Pathway Conclusion	32

4.3	Soil Exposure and Subsurface Intrusion Pathway	33

4.3.1	Soil Exposure	33

4.3.1.1	Physical Conditions	34

4.3.1.2	Soil Exposure Targets	34

4.3.1.3	Soil Exposure Conclusion	34

4.3.2	Subsurface Intrusion	35

4.4	Surface Water Pathway	35

4.5	Air Pathway	36

4.6	Hazard Ranking System Summary	36

5.	REFERENCES	39

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CAN000903324	TABLE OF CONTENTS

LIST OF TABLES

Table 1: Site Chronology

Table 2: 2021 CMI Phase II Sampling Results Summary

Table 3: 2011 DTSC Debris Pile Sampling Results Summary

Table 4: 2018 CUPA Debris Pile Sampling Results Summary

Table 5: Stage 1 - Soil Vapor Survey Results Summary - Select VOCs

Table 6: Stage 1 - Soil Sampling Results Summary - Select Metals

Table 7: Stage 2 - Soil Sampling Results Summary - Select Metals

Table 8: Stage 2 - Groundwater Sampling Results Summary - Select Analytes

Table 9: Stage 3 - Residential Soil Sampling - HRS Soil Screening Benchmarks

Table 10: Stage 3 - Residential Soil Sampling Results - Four-Point Composite

Table 11: Stage 3 - Residential Soil Sampling Results - ISM

Table 12: Stage 3 - Residential Soil Sampling - Lead Results Summary

Table 13: Stage 3 - Residential Soil Sampling - Arsenic Results Summary

Table 14: Stage 3 - Background Soil Sampling Results

Table 15: Bulletin 104 Aquifer Elevations near Site

Table 16: Water Purveyors Operating Active Wells Within the Target Distance Limit

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LIST OF FIGURES

Figure 1	Site Location Map

Figure 2	Proj ect Area Map

Figure 3	Parcel Layout Map

Figure 4	Site Layout Map

Figure 5	Stage 1 - Select Soil Vapor Results

Figure 6	Stage 1 SVP VOC Results

Figure 7	Stage 2 DP & CPT Sampling Layout

Figure 8	Stage 2 DP & CPT VOC Results

Figure 9	Stage 3 - Residential Neighborhood Layout Map

Figure 10	Stage 3 - Residential Sampled Property Layout

Figure 11	Methodology for Determining HRS Screening Benchmarks

Figure 12	Stage 3 - Residential Sampled Property Lead Results

Figure 13	Stage 3 - Residential Sampled Property Arsenic Results

Figure 14	Stage 3 - BZ-1 Sampling Results for Arsenic and Lead

Figure 15	Stage 3 - BZ-2 Sampling Results for Arsenic and Lead

Figure 16	Stage 3 - BZ-3 Sampling Results for Arsenic and Lead

Figure 17	Stage 3 - BZ-4 Sampling Results for Arsenic and Lead

Figure 18	Stage 3 - BZ-5 Sampling Results for Arsenic and Lead

Figure 19	Stage 3 - Reference Area Sampling Results for Arsenic and Lead

Figure 20	Proximate Industrial Facilities Map

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APPENDICES

APPENDIX A ACRONYMS AND ABBREVIATIONS

APPENDIX B REMOVAL EVALUATION CONSIDERATIONS

APPENDIX C SITE RECONNAISSANCE INTERVIEW AND OBSERVATION
REPORT/PHOTOGRAPHIC DOCUMENTATION

APPENDIX D CONTACT LOG AND CONTACT REPORTS

APPENDIX E TRANSMITTAL LIST

ATTACHMENTS

ATTACHMENT 1	REFERENCES

ATTACHMENT 2	DEBRIS PILE TIMELAPSE

ATTACHMENT 3	SAMPLING AND ANALYSIS PLAN (SAP) - STAGE 1 & 2

ATTACHMENT 4	SAMPLING AND ANALYSIS PLAN (SAP) - STAGE 3

ATTACHMENT 5	SAMPLE NO. - CLP CORRELATION TABLES

ATTACHMENT 6	CPT LITHOLOGICAL PROFILE REPORTS

ATTACHMENT 7	LABORATORY REPORTS - STAGE 1 & 2

ATTACHMENT 8	LABORATORY REPORTS - STAGE 3

ATTACHMENT 9	FIELD SAMPLING LOGBOOK
ATTACHMENT 10 EPA DOCUMENT 540-F-94-028

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CAN000903324	EXECUTIVE SUMMARY

EXECUTIVE SUMMARY

The Central Metal site is located at 8201 Santa Fe Ave., Huntington Park, Los Angeles County,
California. The approximately 11-acre site is located within an industrial corridor bound to the east
and west by residential neighborhoods, specifically the unincorporated communities of Walnut
Park to the east and Florence-Firestone to the west.

Industrial operations have been conducted at the site since at least the late 1920s, at which time
the northeastern portion of the site was developed into a metal-tank manufacturing facility. These
operations continued through the mid-1980s. A metal foundry also operated on the site during this
time period. In the late 1980s, this portion of the site was converted into a scrap metal recycling
facility that operated as Damille Metal Supply, Inc. (DMS) through at least the late 1990s. In 2002,
Central Metal, Inc (CMI) acquired the facility and continued on-site metal recycling operations.
CMI expanded its operations to the southwestern portion of the site in 2004, which had previously
been occupied by rail lines, a train depot, and various other rail related buildings since the late
1800s. Scrap metal operations at the facility were terminated in 2016 after Los Angeles County
did not grant a new Conditional Use Permit. The entirety of the site was purchased in December
2021 and is currently in the process of being converted into a U-Haul® truck rental and storage
facility.

Historical on-site metal recycling operations generally included the sorting and cleaning of
purchased scrap metal followed by the cutting and shredding of the metal into compact sizes for
domestic and international shipment. During operations, various scrap metal and debris were
stored across the exterior portions of the site in large, uncontained, and uncovered debris piles. A
debris pile located on the north-central portion of the site in 2005 is estimated to have covered
more than 23,000 square feet (ft2) and been several stories in height.

In 2016, the U.S. Environmental Protection Agency (EPA) identified the site as a potentially
hazardous waste site and entered it into the Superfund Enterprise Management System (SEMS).
EPA completed a Preliminary Assessment (PA) for the site in 2018. Upon review of the PA, EPA
determined that further investigation was warranted to determine if the site was a source of
area-wide volatile organic compound (VOC) and/or metals groundwater contamination and,
subsequently, initiated a Site Inspection (SI). As part of the SI, EPA conducted an on-site soil
vapor survey and limited soil sampling event in April 2019 (Stage 1) followed by a more
comprehensive soil and groundwater sampling event in June 2019 (Stage 2).

During the 2019 Stage 1 and Stage 2 SI Investigations, subsurface soils at the site were identified
with elevated concentrations of metals, specifically arsenic, cadmium, cobalt, copper, lead, silver,
and zinc. Tetrachloroethylene (PCE) was identified in soil vapor at a single location but was not
detected in soil samples or in groundwater beneath the site. Based on the minimal VOC
concentrations found in soil groundwater during the investigation, the site does not appear to be a
significant source of area groundwater contamination.

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CAN000903324	EXECUTIVE SUMMARY

During the course of the SI, EPA became aware that a debris pile on the facility had been
containerized in December 2018 and subsequently sampled by CMI under the direction of the local
Certified Unified Program Agency (CUPA). Analytical data indicated that the material was
classified as a hazardous waste based on identified concentrations of arsenic, lead, and/or
cadmium. Moreover, an investigation conducted in 2011 by the California Department of Toxic
Substances Control (DTSC) also identified high levels of hazardous heavy metals in waste piles
on the site, specifically lead, cadmium, and zinc.

Prompted by concerns raised by the surrounding community that windblown material from
historical on-site debris piles had blown into their yards, EPA proceeded to complete a
comprehensive aerial imagery analysis to assess the controls and volumes of historical debris piles
as well as an analysis of the prevailing wind directions. Based on the results of this analysis, along
with the site's proximity to large downwind residential populations, EPA concluded that a
residential sampling effort was necessary to determine if hazardous metals from historical on-site
debris piles, which may have had contamination similar to those found in the sampled debris pile,
could have been deposited onto nearby residential properties.

EPA conducted the Stage 3 SI sampling event in two phases: a residential sampling phase, which
was completed in August 2022; and a background sampling phase, which was completed in
October 2022. Both phases included the collection of shallow (i.e., less than 4 inches) soil samples
from areas of exposed soil using a four-point composite procedure and Incremental Sampling
Methodology (ISM). During the residential phase, 63 properties were sampled within the Walnut
Park residential neighborhood, downgradient with respect to the primary easterly wind direction,
and 20 properties were sampled within the Florence-Firestone residential neighborhood,
downgradient with respect to the secondary westerly wind direction. The background phase
included the sampling of five publicly accessible areas to determine reference concentrations of
metals in the urban environment in soils near the site but likely not impacted by the site.

Lead was identified at concentrations exceeding the assigned Hazard Ranking System (HRS) soil
screening benchmark of 401 parts per million (ppm) at eight properties; arsenic was identified at
concentrations exceeding the assigned HRS screening benchmark of 22 ppm at three properties.

In summary, there are minimal screening level exceedances; 11 out of 83 residences or 13% of the
sample group. EPA is working with owners of the 11 properties to arrange additional sampling if
requested. Residential sampling data does not indicate Central Metal as a significant source of
lead, arsenic, or other metals in the subject neighborhoods. Specifically, concentrations within the
sampled area are sporadic and do not indicate any correlation between magnitude and distance
from the facility. Therefore, metal contamination in the sampled residential soils cannot be
attributed to historical or current operations at the Central Metal site and are most likely a function
of both historical and current stationary and non-stationary lead sources found in the surrounding
Los Angeles metropolitan area.

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CAN000903324	INTRODUCTION

1. INTRODUCTION

1.1	EPA Regulatory Authority

Under the authority of the Comprehensive Environmental Response, Compensation, and Liability
Act of 1980 (CERCLA), Weston Solutions, Inc. (WESTON®) has been tasked to conduct a Site
Inspection (SI) of the Central Metal site in Huntington Park, Los Angeles County, California.
Acronym and abbreviations are listed in Appendix A.

The purpose of an SI is to evaluate a site with potential releases of a hazardous substance and its
environs to assess the threats, if any, posed to public health, welfare, or the environment and to
determine if further investigation under CERCLA is warranted. The site is then evaluated using
U.S. Environmental Protection Agency (EPA) Hazard Ranking System (HRS) criteria to assess
the relative threat associated with actual or potential releases of hazardous substances at the site.
The HRS has been adopted by EPA to help set priorities for further evaluation and eventual
remedial action at hazardous substance sites. The HRS is the primary method of determining a
site's eligibility for placement on the National Priorities List (NPL). The NPL is a list compiled
by EPA of uncontrolled hazardous substance releases in the United States that are priorities for
long-term remedial evaluation and response.

This SI Report summarizes the findings of these preliminary investigative activities and establishes
whether the site is eligible for NPL consideration based on the magnitude and extent of
contamination attributable to the site. Ineligibility does not necessarily indicate that there is no
contamination on the site only that, based on available data, the site does not currently meet the
criteria for placement on the NPL; state and local authorities have different criteria and authorities
which may allow them to move forward with additional assessment or remedial activities.

Unaltered petroleum products, as well as any substances that are purposefully added to the
indigenous petroleum product during the refining process, are excluded from consideration under
CERCLA. National Contingency Plan (NCP) factors are summarized in Appendix B. More
information about the Superfund program is available on the EPA website at
https://www.epa.gov/superfund/what-superfund.

1.2	EPA Regulatory History

The Central Metal site was identified as a potentially hazardous waste site and was entered into
the Superfund Enterprise Management System (SEMS) on March 11, 2016 (CAN000903324). The
site was formerly identified in SEMS as Damille Metal SVC (EPA, 2023a).

On behalf of EPA, WESTON® completed a Preliminary Assessment (PA) for the Central Metal
site in January 2018. Upon review of the PA, EPA determined that further assessment was needed
under CERCLA and initiated an SI. In support of the SI, WESTON completed soil vapor, soil, and

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CAN000903324	INTRODUCTION

groundwater sampling events at the site between April 2019 and June 2019 (EPA, 2023a
WESTON, 2017; WESTON, 2020).

Upon review of information obtained during these events, EPA determined that off-site sampling
of residential soils was required to adequately assess the site's eligibility for the NPL and expanded
the scope of the ongoing SI to include a residential sampling component. Planning and execution
of the residential sampling required working around COVID-19 and residential access constraints.
WESTON completed the residential soil sampling events between August 2022 and October 2022.

The Central Metal site has multiple listings in the Resource Conservation and Recovery Act
Information (RCRAInfo) system database including as: Central Metal Inc (Handler ID No.
CAR000214700) and U-Haul Moving & Storage of Alameda Corridors (Handler ID Nos.
CAC003161660 and CAC003241657); and Central Metal Inc (Handler ID: CAR000214700). No
process information or handler classification is listed in the database (EPA, 2023b).

1.3 Apparent Problem

EPA determined that an SI was needed at the Central Metal site because of the following apparent
problems:

¦	Between the late 1920s and the mid-1980s, the site was operated as a foundry and a
corrugated metal-tank manufacturing facility. Between the late 1980s and 2016, the site
was operated as a metal supply and industrial scrap metal recycling facility
(Brash, 2019; DTSC, 2016; JTT, 2012; UCSB, 2023; WEECO, 2014)

¦	Between 1999 and 2001, more than three tons of tetrachloroethylene (PCE) were
reported as being manifested from the site (DTSC, 2023a).

¦	Inspections conducted at the site by various state and local regulatory agencies resulted
in the issuance of numerous Notices of Violation (NOVs) as a result of poor
housekeeping, improper hazardous waste storage, and improper hazardous waste
disposal (DTSC, 2012; DTSC, 2016; WESTON, 2017).

¦	The site is situated in an area of known volatile organic compound (VOC)
contamination within the drinking water aquifers. The Miramonte well field is located
approximately 0.8 mile west-northwest from the site where municipal supply wells
have exhibited trichloroethylene (TCE) concentrations up to 25 micrograms per liter
(|ig/L) and PCE concentrations up to 1.5 |ig/L. The federal Maximum Contaminant
Level (MCL) for both PCE and TCE is 5.0 |ig/L (RWQCB, 2023a).

¦	In March 2011, a California Department of Toxic Substances Control (DTSC)
investigation at the site identified concentrations of metals, primarily lead and zinc, in
on-site debris piles that exceeded hazardous waste criteria (DTSC, 2011).

¦	In December 2018, a debris pile on the site was containerized into 21 large roll-off bins
and sampled under the direction of the local Certified Unified Program Agency

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CAN000903324	INTRODUCTION

(CUPA). The containerized material was classified as hazardous waste based on the
identified concentrations of arsenic, lead, and/or cadmium (Brash, 2019).

¦ A comprehensive analysis of historical aerial imagery indicated that former debris piles
at the site, including the pile that had been containerized in 2018, were typically
uncovered, or poorly covered. This information, in combination with local wind pattern
analysis and verbal accounts provided to EPA by near-site residents, indicated a
significant potential that fine-grained materials originating from historical on-site
debris piles could have migrated through the air and been deposited onto nearby
residential properties (Attachment 2; Google, 2023; WRCC, 2020).

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CAN000903324	SITE DESCRIPTION

2. SITE DESCRIPTION

2.1 Location and Description

(see Figure 1 through Figure 4)

The Central Metal site is located at 8201 Santa Fe Ave., Huntington Park, California. An additional
address, 8240 Marbrisa Ave, is also associated with the site property. The geographic coordinates
for the site are 33° 57' 47.31" North Latitude and 118° 13' 52.07" West Longitude. The site area
exceeded the 80th percentile in the United States for 10 of the 12 Environmental Justice (EJ) Indices
(EPA, 2023c; Google, 2023; LACA, 2023).

The site comprises nine Los Angeles County assessor parcels and occupies approximately
11.1 acres in a mixed industrial and residential area of unincorporated southern Los Angeles
County. The site is bordered to the north across Short Street by industrial businesses; to the west
across the Alameda Corridor by industrial businesses, with residential buildings of the
Florence-Firestone community beyond; to the south by an industrial recycling business; and to the
east across Santa Fe Avenue by commercial businesses and residential buildings of the Walnut
Park community. The southeastern portion of the site is bordered directly to the northeast by
single-family homes. Portions of both the Walnut Park and Florence-Firestone (also known as
Florence-Graham) residential communities in proximity to the site are composed primarily of
single-family residences situated on parcels that are typically less than 0.25 acre in size; however,
several multi-family and/or apartment complexes are also intermixed within the neighborhoods
(Appendix C; Google, 2023; LACA, 2023).

For the purposes of this SI, two distinct operational areas were designated within the site
boundaries based on the historical uses of the property. These areas are henceforth referred to as
the Former Tank Manufacturing Area (FTMA) and the Former Railroad Area (FRA). The FTMA
occupies approximately 4.0 acres at the northeastern portion of the site and includes five of the
nine site parcels: 6202-036-009 and 6202-037-004, -006, -009, and -010. The FRA occupies
approximately 7.1 acres at the southwestern portion of the site and includes the remaining four site
parcels: 6202-036-010, -011, -012, and -013 (Appendix C; Google, 2023; LACA, 2023).

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CAN000903324	SITE DESCRIPTION

The site is currently occupied by three primary structures, including the following (Appendix C;

Google, 2023; LAC A, 2023; UCSB, 2023; WESTON, 2017):

• An approximately 53,000 square foot (ft2) manufacturing and warehouse building
(Warehouse) at the east-central portion of the site. This building includes a maintenance
shop and hazardous waste storage area (HWSA) at the southern portion, and an
aboveground storage tank (AST) area at the northern portion. The Warehouse was first
constructed between 1923 and 1928 and expanded in multiple stages through the
mid-1940s.

•	An approximately 2,500 ft2 office building (Main Office) at the northeast corner of the site.
The Main Office was constructed between 1923 and 1928.

•	A stormwater treatment system at the southwestern corner of the site, which was installed
in approximately 2008.

Historically, the Warehouse included an additional approximately 62,000 ft2 extension to the west
of the current structure, which was reportedly demolished in 1988, and a small scale house to the
north, which was removed in mid-2021. Railroad tracks bisected the property in a generally
southeastern to northwestern direction until they were abandoned in the late 1990s, likely
concurrent with the construction of the adjacent Alameda Corridor, and subsequently removed in
the early 2000s. A railroad depot and associated structures were formerly located on the
northwestern portion of the site from at least the late 1800s through approximately the mid-1960s.
Prior to the installation of the existing stormwater treatment system, a historical stormwater
treatment system was located at the north-central portion of the site (Google, 2023; LAC A, 2023;
LAPL, 2023; UCSB, 2023, WEECO, 2014).

Based on aerial imagery, numerous large scrap metal waste and debris piles, as well as various
pieces of heavy equipment (e.g., metal sorters, metal crushers, excavators) were located on the
property between at least 2003 and 2018. These piles, which were generally confined to the FTMA
from 2003-2007 and from 2012-2018, appeared to encompass areas up to a 0.5 acre and to be
several stories in height. The specific materials that comprised the various piles are not known;
however, it is estimated that they were primarily a combination of metal and debris generated
during metal recycling operations (Attachment 2; Brash, 2019; DTSC, 2011; Google, 2023).

The site is entirely fenced, and the surface of the site is entirely covered in pavement or buildings.
However, prior to approximately 2007, the western portion of the site was unpaved. During SI
investigative efforts conducted by EPA in April 2019 and June 2019, the concrete slab was found
to vary from approximately 18 inches to 48 inches (Appendix C; Google, 2023).

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CAN000903324

2.2 Operational and Regulatory History

2.2.1 Operational History

(see Table 1)

September 2023
SITE DESCRIPTION

The National Tank & Manufacturing Company (National Tank) presumably owned the FTMA
portion of the Central Metal site from approximately the late 1920s through the mid-1980s.
Historical ownership information of the FTMA prior to the late 1920s is not known. By 1989, the
five FTMA parcels were owned by David Miller doing business as Damille Metal Supply, Inc.
(DMS). In approximately 2002, Jong Uk Byun, doing business as Central Metal, Inc. (CMI),
purchased the FTMA parcels and, in approximately 2004, purchased the remaining four Former
Railroad Area (FRA) parcels. On December 31, 2021, the entirety of the site was purchased by the
current corporate owner, 8201 Santa Fe (CA) LLC, a subsidiary of AMERCO Real Estate
Company, a subsidiary of U-Haul® Holding Company (formerly AMERCO). Historical ownership
information of the FRA is not known; however, these parcels were presumably owned by the
Southern Pacific Railroad (SPRR) and its related entities (Appendix D; DTSC, 2023b,
Google, 2023; JTT, 2012; LACFD, 1999; LACFD, 2002; WCAB, 1984; WEECO, 2014).

The current number of workers that regularly occupy the site is not known; however, during on-site
SI activities in June 2019, up to a dozen administrative and/or maintenance workers were observed
at the facility (Appendix C).

National Tank & Manufacturing Company (National Tank) /Ace Foundry

National Tank was historically a manufacturer of corrugated metal water-and-oil tanks that
operated within the FTMA portion of the site from approximately the late 1920s through the
mid-1980s. The specific tank manufacturing operations and hazardous materials associated with
these operations are not known; however, the majority of operations are presumed to have occurred
within the existing Warehouse. A machine shop was located at the southern portion of the
Warehouse. Concurrent with National Tank operations, Ace Foundry operated within the former
westward extension of the Warehouse from at least 1938 to 1979, presumably conducting metal
casting activities. Ace Foundry operations included a cleaning room and a machine shop within
the southern portion of the former Warehouse extension. No additional information is known
regarding specific locations of foundry operations, use, or storage of hazardous substances, or if
Ace Foundry and National Tank operations were interconnected (JTT, 2012; WCAB, 1984;
WEECO, 2014).

Damille Metal Supply, Inc. (DMS)

Damille Metal Supply, Inc. (DMS) was an industrial scrap metal recycler that operated on the
FTMA portion of the site from approximately 1989 through the late 1990s or early 2000s.
Operations included buying and selling scrap metal, including at least aluminum, steel, copper,
and titanium. Scrap metals were sorted on site, sheared or cut, and shipped off site. Hazardous

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CAN000903324	SITE DESCRIPTION

waste manifests indicate that between 1999 and 2001, approximately 3.58 tons of PCE waste was
generated at the site. The origin of this organic waste is not known. No additional information is
known regarding specific activities or hazardous substances associated with DMS operations.
Additional businesses reported as using addresses associated with the site during the DMS
operational period include: L&S Metals; MCS, Inc.; and All Star Metals, Inc. Specific information
regarding these businesses is not known; however, it is presumed that they were conducting
activities related to scrap metal operations and were associated with DMS (DTSC, 2016;
LACFD, 1999; LACFD, 2002; WEECO, 2014).

Central Metal, Inc. (CMI)

Central Metal, Inc. (CMI) operated on the site as an industrial metal supply and scrap metal
recycling facility from approximately 2002 to 2016. CMI operations on the FRA portion of the
site began in approximately 2004. On-site activities included purchasing scrap metals from various
industries, primarily fabrication, manufacturing, and construction companies. Scrap metals were
then sorted, cleaned, and cut or shredded into compact sizes for domestic and/or international
shipment. Recycled metals included at least steel, aluminum, copper, brass, and stainless steel. The
facility also received, stored, and resold electronic waste (e-waste) such as computer monitors,
desktop towers, batteries, and other computer parts. Spent automobile batteries, hydraulic oil,
motor oil, antifreeze, gasoline, and diesel fuel were stored on site. Historically, stormwater runoff
from the site was reportedly treated at the northern portion of the facility before being discharged
to the municipal stormwater system on Short Street. Beginning in approximately 2008, stormwater
runoff was treated in a system located at the southwestern corner of the site and subsequently
discharged to Alameda Street. The facility was "shuttered" in approximately July 2016 after failing
to acquire a new Conditional Use Permit from Los Angeles County. Between approximately early
2020 and late 2021, the facility was used to store cargo shipping containers by an unknown
operator, presumably under an agreement with CMI (Appendix C; Brash, 2019; DTSC, 2016;
Google, 2023; LACFD, 2005; WEECO, 2014).

Based on aerial imagery and historical investigation reports, numerous large debris piles were
located on the property between at least 2003 and 2018. These piles, which were generally
confined to the FTMA portion of the site from 2003-2007 and from 2012-2018, included bulk and
fine metal debris, e-waste, and floor sweepings. The piles encompassed areas up to 0.5 acre and
were several stories in height. All piles were removed from the facility between 2018 and 2020.
Although the specific materials that comprised all the various piles are not known, previous
investigations that included sampling of on-site piles indicated elevated concentrations of
hazardous metals and other compounds including, but not limited to, petroleum hydrocarbons and
polychlorinated biphenyls (PCBs) (Attachment 2; Brash, 2019; DTSC, 2011; Google, 2023).

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CAN000903324	SITE DESCRIPTION

Southern Pacific Railroad (SPRR)

The FRA portion of the site was used for railroad operations by the Southern Pacific Railroad
(SPRR) since at least 1875 and potentially since the late 1860s. Southern California's first railroad,
the Los Angeles & San Pedro Railroad, was completed in 1869 and connected Los Angeles to the
port at Wilmington. In 1872, SPRR acquired the railroad and completed the construction of the
Santa Ana Branch line in 1875. The new branch connected the original branch line, the Wilmington
Branch, to the cities of Anaheim, and later, Santa Ana. The Santa Ana Branch line bisected the
site and junctioned with the Wilmington Branch, which ran parallel to the western edge of the site,
at the northwestern corner of the site. An alternative junction was located approximately 0.25 mile
south of the site. By 1896, a railroad depot had been constructed immediately south of the branch
line junction at the northern portion of the FRA, which was originally named Florence Station and
later changed to Firestone Park Station. Various railroad-related buildings were located within this
area and included small offices and transloading buildings. The railroad buildings were removed
in stages between the late 1950s and the early 1970s and the rail lines, both the on-site and
adjacent-west branch segments, were abandoned and removed in the late 1990s and early 2000s,
presumably due to the construction of the subgrade Alameda Corridor (LAPL, 2023;
Spitzzeri, 2019; UCSB, 2023; WEI, 2021b).

U-Haul

U-Haul® began operating at the site in early 2022 in a limited capacity and is currently proposing
to develop the property into a U-Haul Moving and Storage Store. Proposed on-site activities
include self-storage, warehousing, truck and trailer rentals, maintenance of U-Haul vehicles, and
retail sales. The project would include the demolition of the existing Main Office and stormwater
treatment systems, the modification of the existing Warehouse into a truck rental area, and the
construction of several new buildings including: an approximately 57,000 ft2 single-story storage
building at the northeastern portion of the site, an approximately 42,000 ft2 four-story self-storage
building at the southwestern portion of the site, and an approximately 29,000 ft2 two-story vehicle
repair building at the southeastern portion of the site (DTSC, 2023b).

2.2.2 State and Local Regulatory History
2.2.2.1 State of California

The Central Metal site is listed in the California Environmental Protection Agency, Department of
Toxic Substances Control's (DTSC) Envirostor database as of September 2023. The site is listed
in the database as: U-Haul Moving & Storage of Alameda Corridors (Damille Metal Svc - Central
Metals, Inc. (Envirostor ID: 60002329), addressed at 8201 Santa Fe Ave. The site is listed as a
Voluntary Agreement site that was derive as of April 26, 2023 (DTSC, 2023c).

In 2012, DTSC issued an Enforcement Order for Central Metal, Inc. in regard to violations of the
California Health and Safety Code and the California Code of Regulations. During DTSC's March

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2011 inspection of the site, it was documented that the facility had generated two piles of
contaminated materials consisting of finely divided heavy metals and e-waste debris generated
through the metal recycling operations. The facility failed to minimize and properly containerize
leaking hazardous waste from broken battery cases, broken e-wastes, oily wastes and sludges, and
heavy metal dusts inside and outside the facility. The facility complied with DTSC's requirement
to remove and properly dispose of the two contaminated soil piles at an authorized facility; more
than 430 tons of contaminated soil was reported on waste manifests in 2011 (DTSC, 2012;
DTSC, 2023a).

In August 2016, DTSC completed a Site Screening of the site for EPA as part of the
Slauson-Alameda-Gage (SAG) Groundwater Discovery Project, which was focused on locating
potential sites contributing to the area's groundwater VOC contamination. Based on this screening,
EPA determined that further assessment was needed (DTSC, 2016).

In May 2023, DTSC entered into a California Land Reuse and Revitalization Act (CLRRA)
Agreement with the current corporate owner of the site, 8201 Santa Fe (C A), LLC, for the purposes
of conducting additional environmental assessment and remediation, as needed (Docket No.
HAS-FY22/23-116). A CLRRA agreement is a type of Voluntary Oversight Agreement offered
by DTSC that provides limited liability protection for a bona fide purchaser, bona fide prospective
purchaser, innocent landowner, contiguous property owner, or a ground tenant of a property if
specific eligibility criteria are met (DTSC, 2023b).

The site is not listed in Regional Water Quality Control Board's (RWQCB's) GeoTracker database
as of September 2023 (RWQCB, 2023b).

2.2.2.2 County of Los Angeles

The Los Angeles County Department of Public Works (LADPW) has issued numerous NOVs to
the site. In 2004, 2005, and 2008 NOVs were issued for operating an unpermitted stormwater
filtration system. An April 2016 Stormwater Certificate of Inspection noted that the facility was
operating a permitted stormwater treatment system; however, the certificate was not re-issued due
to deficient best management practices that consisted of inadequate employee training and
inadequate filters within the treatment system. It is unknown if the facility complied and was
re-issued the stormwater certificate (LADPW, 2004; LADPW, 2005; LADPW, 2008a;
LADPW, 2008b; LADPW, 2016).

The local CUP A, which is the Los Angeles County Fire Department, Health Hazardous Materials
Division (HHMD), has conducted numerous inspections on the site. In 1995, HHMD issued an
NOV for inadequate waste disposal, inadequate hazardous materials storage, inadequate training,
and inadequate maintenance of manifests. In 2005, HHMD issued an NOV for inadequate
hazardous waste labeling and management, poor housekeeping, inadequate hazardous waste
storage, and lack of required permits. In 2009, HHMD issued an NOV for poor housekeeping,

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improper labeling, inadequate hazardous waste storage, and improper employee training. In 2014,
HHMD issued an NOV for failure to properly label hazardous waste accumulation containers,
failure to dispose of hazardous waste within 180 days, and failure to properly close hazardous
waste containers (LACFD, 1995; LACFD, 1999; LACFD, 2005; LACFD, 2009; LACFD, 2014).

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3. INVESTIGATIVE EFFORTS

3.1 Previous Investigations

3.1.1 Non-Regulatory Investigations

3.1.1.1	2000 Subsurface Soil Investigation

In March 2000 and April 2000, a subsurface soil investigation was conducted within the FTMA,
which is the first known environmental investigation conducted at the site. It is not known on
whose behalf this investigation was conducted or whether any oversight was conducted by a local
regulatory agency. During the investigation, nine borings were advanced to a total depth of 20 feet
(ft) below ground surface (bgs). Three of the borings were located within the east-central portion
of the Warehouse, one was located within the northwest portion of the Warehouse, three were
located immediately southwest of the Warehouse adjacent to the maintenance shop, and two were
located in the current scrap pile area at the central portion of the site. The total number of samples
collected during the investigation is not known. Select samples were analyzed for total petroleum
hydrocarbons (TPH), VOCs, metals, and PCBs. Reportedly, relatively low concentrations of TPH
were identified in the 15 ft-bgs sample collected from the maintenance area at the southern side of
the Warehouse. No additional samples reported detectable concentrations of the analyzed
substances. The specific sampling program, including sampling methodology and analytical
results are unknown (WEECO, 2014).

3.1.1.2	2001 CMi Subsurface Soil Investigation

In April 2001, CMI advanced four borings across the central and north-central portions of the
FTMA to a total depth of 20 ft-bgs. Soil matrix samples were collected at 5 and 10 ft-bgs within
each boring, resulting in a total of 10 field samples that were submitted for TPH and VOC analyses.
Samples were collected in brass tubes using a slide hammer sampler. The 6-inch brass tubes were
sealed using Teflon® sheeting and plastic caps. All samples were reported as "non-detect" for TPH
and VOCs; however, the utilized sample collection methodology is not currently considered
acceptable for VOC analysis due to the increased potential for contaminant volatilization. Samples
were not submitted for metals analysis (WEECO, 2014).

3.1.1.3	2003 CMI Subsurface Soil Investigation

In December 2003, CMI advanced 16 borings across the FRA to a total depth of 30 ft-bgs. The
specific locations of the borings are not known; however, four of the borings were reportedly
advanced adjacent to the "previous railroad track" area whereas the remaining 12 were advanced
within the "vacant lot" area. Within each boring, soil matrix samples were generally collected at
10 ft-bgs, 20 ft-bgs, and 30 ft-bgs. Forty-seven samples were collected, and 32 of these samples
were submitted for TPH and VOC analysis. The remaining 15 samples were screened on-site using
a photoionization detector (PID). Samples were collected in brass tubes using a slide hammer

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sampler. The 6-inch brass tubes were sealed using Teflon® sheeting and plastic caps. All samples
were reported as "non-detect" for TPH and VOCs; however, the utilized sample collection
methodology is not currently considered acceptable for VOC analysis due to the increased
potential for contaminant volatilization. Samples were not submitted for metals analysis.
Groundwater was not encountered during the investigation (WEECO, 2014).

3.1.1.4	2004 CMI Subsurface Soil Investigation

In September 2004, CMI advanced an additional five borings within the FRA to a total depth of
10 ft-bgs. The specific locations of the borings are not known; however, it was reported that they
were advanced adjacent to the "previous railroad track area." Soil matrix samples were collected
at 5 ft-bgs and 10 ft-bgs within each boring, resulting in a total of 10 field samples that were all
submitted for TPH and VOC analysis. Samples were collected in the direct-push acetate liners.
The liners were cut and sealed using Teflon sheeting and plastic caps. All samples were reported
as "non-detect" for TPH and VOCs; however, the utilized sample collection methodology is not
currently considered acceptable for VOC analysis due to the increased potential for contaminant
volatilization. Samples were not submitted for metals analysis (WEECO, 2014).

3.1.1.5	2010 CMI Debris Pile Classification Sampling

In September 2010, CMI collected four solid matrix samples from two distinct on-site debris piles.
The specific sampling methodology or sample locations are not known. Samples were reportedly
analyzed for VOCs, TPH, and soluble metals. The specific analytical results are not known;
however, all four of the samples reportedly exhibited soluble lead concentrations that exceeded
state hazardous waste criteria with a maximum sample concentration of 50 milligrams per liter
(mg/L). Both the Toxicity Characteristic Leaching Procedure (TCLP) and Soluble Threshold Limit
Concentration (STLC) hazardous waste criteria for lead are 5 mg/L (DTSC, 2011).

3.1.1.6	2021 CMI Phase II Sampling

(see Table 2)

In September 2021, CMI advanced 14 soil borings, SV-21 through SV-34, within the FRA to a
total depth of 15 ft-bgs. Within each boring, soil vapor probes were installed at 5 ft-bgs and
15 ft-bgs and soil matrix samples were collected at 2 ft-bgs, 5 ft-bgs, and 15 ft-bgs. An additional
soil matrix sample, P-l, was collected from a depth of 6 inches within an area of exposed soil at
the central portion of the site; the origin of this area of exposed soil is not known (e.g., machinery
foundation excavation, etc.); however, it appears to have been formerly occupied by a debris pile.
Soil vapor sampling and analyses was performed on-site using a mobile laboratory with all samples
analyzed for VOCs and fuel oxygenates. Shallow soil matrix samples were initially analyzed for
CAM 17 metals analysis (also known as Title 22 metals) with deeper samples only analyzed in
borings where the shallow sample exhibited elevated concentrations. Soil matrix samples collected
from borings that exhibited detectable concentrations of VOCs in soil vapor were also analyzed

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for VOCs. In addition, select soil matrix samples underwent solubility analysis where total metals
concentrations exceeded assigned thresholds (WEI, 2021b).

The most elevated metal concentrations were generally exhibited in the near-surface soil sample,
P-l, and included, but were not limited to: antimony (46 milligrams per kilogram [mg/kg]), arsenic
(28 mg/kg), barium (2,600 mg/kg), cadmium (29 mg/kg), chromium (200 mg/kg), copper
(5,700 mg/kg), lead (3,600 mg/kg), mercury (9.6 mg/kg), nickel (500 mg/kg), silver (5.7 mg/kg),
and zinc (20,000 mg/kg). Based on the metals results of the 2 ft-bgs boring samples, three 5 ft-bgs
samples were additionally analyzed and no 10 ft-bgs samples were analyzed. Five of the 17
analyzed boring samples exhibited an arsenic concentration greater than 14 mg/kg, with a
maximum result of 78 mg/kg at boring SV-28 (west-central portion of FRA). Eight of the 17
analyzed boring samples exhibited a lead concentration greater than 41 mg/kg, with a maximum
result of 190 mg/kg at boring SV-27 (east-central portion of FRA) (WEI, 2021b).

VOCs identified in the soil vapor survey included, but are not limited to, PCE, Freon 113, toluene,
and total xylenes. Of the detected analytes, only PCE exhibited at concentrations exceeding
corresponding EPA Vapor Intrusion Screening Levels (VISLs), which occurred in 7 of the 28
samples. PCE was detected in all soil vapor samples and ranged from 10 micrograms per cubic
meter (|ig/m3) to 1,340 |ig/m3; shallower samples were generally more elevated than deeper
samples. The maximum concentrations were identified in the samples collected from SV-21
(northwest portion of FRA) that exhibited 1,340 |ig/m3 (5 ft-bgs sample) and 1,290 |ig/m3
(15 ft-bgs sample). Based on the soil vapor data, twelve soil matrix samples were selected and
submitted for VOC analysis. Benzene was the only VOC detected in the submitted samples and
was identified in a single sample at a concentration of 4.9 micrograms per kilogram (|ig/kg); the
residential Regional Screening Level (RSL) for benzene is 1,200 |ig/kg. The Resident and
Commercial VISLs (May 2023) for PCE are 360 |ig/m3 and 1,570 |ig/m3, respectively
(WEI, 2021b).

3.1.2 State and Local Regulatory Agency Investigations

3.1.2.1 2011 DTSC Debris Pile Sampling Investigation

(see Table 3)

In January 2011, DTSC received a complaint from local residents in the vicinity of the Central
Metal site who were concerned that metal dusts from the facility may be impacting their properties.
In March 2011, DTSC, accompanied by staff of the South Coast Air Quality Management District
(AQMD) and HHMD, conducted an inspection of the site. During the inspection, DTSC collected
five aqueous matrix (i.e., liquid, sludge, and sediment) samples from both on site and immediately
off site, as well as 11 solid matrix samples from two distinct on-site debris piles, although the
specific locations of these piles are unknown. All samples were analyzed for metals (both total and
soluble) with a subset also being analyzed for TPH, mercury, and PCBs. Analytical results

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indicated that four of the five aqueous matrix samples exhibited soluble lead concentrations that
exceeded state hazardous waste criteria, and one or more samples also exceeded the waste criteria
for TPH, PCBs, and/or mercury. All solid matrix samples exhibited lead and zinc concentrations
that exceeded hazardous waste criteria (both total and solid) with one sample also exceeding the
soluble waste criteria for cadmium (DTSC, 2011; WEI, 2021a).

3.1.2.2 2017-2018 CUP A Debris Pile Investigation

(see Table 4)

In September 2017, the local CUP A, HHMD, collected a single solid matrix sample from an on-site
debris pile during a routine inspection. The sample reportedly exhibited concentrations of both
total lead and total zinc that exceeded the state hazardous waste criteria. However, neither the
specific sample collection location nor the full analytical results are known. In December 2018,
CMI, at the direction of HHMD, containerized the sampled pile into 21 roll-off bins and collected
additional solid matrix samples for waste classification purposes that were analyzed for total
metals. CMI conducted a statistical analysis of the analytical results and reported to HHMD that
7 of the 21 bins could be classified as hazardous waste based on total arsenic concentrations.
Subsequently, the samples collected from the remaining 14 bins were additionally analyzed for
soluble metals, which indicated that all 14 additional bins could be classified as hazardous waste
based on soluble lead concentrations. One of the 14 bins also exceeded the soluble hazardous waste
criteria for cadmium (Brash, 2019).

3.1.3 Previous Federal Regulatory Agency Investigations

No known previous federal regulatory agency sampling investigations have been conducted at the
Central Metal site.

3.2 Site Inspection (SI) Sampling

Between April 2019 and October 2022, WESTON®, on behalf of EPA, conducted the SI sampling
events at the Central Metal site. The Stage 1 SI sampling event (April 2019) included soil vapor
sampling and subsurface soil matrix sampling. The primary objective of the Stage 1 event was to
collect screening-level analytical data to support planning decisions for the subsequent Stage 2
event. The Stage 2 SI sampling event (June 2019) included subsurface soil matrix source sampling
and groundwater release sampling. The primary objective of the Stage 2 investigation was to
document information to be used in the HRS characterization process including additional source
areas and levels of contamination in site soils and groundwater.

In August 2022, the Stage 3 SI Residential sampling event was completed, which included
four-point composite soil matrix release sampling and Incremental Sampling Methodology (ISM)
non-discrete soil sampling. The Stage 3 SI Background sampling event (October 2022) included
four-point composite and ISM shallow soil matrix background sampling. A more detailed

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description of these sampling methodologies is provided in the Stage 3 Sampling and Analysis
Plan (SAP) (Attachment 4). The primary objective of the Stage 3 investigation was to determine
if residential properties downwind of the site exhibited elevated concentrations of hazardous
metals in near-surface soils and, if so, determine if at least some portion of this contamination was
a result of historical on-site activities.

Sampling methodology, locations, analyses, and analytical results are summarized below. The
SAP for the Stage 1 and Stage 2 sampling events was approved by EPA in October 2018, and the
SAP for the Stage 3 event was approved by EPA in June 2021. The Stage 1 and 2 SAP and the
Stage 3 SAP are provided in Attachment 3 and Attachment 4, respectively.

Based on the historical use of the site and the previous sampling events described in Section 3.1,
the following contaminants of concern (COCs) were identified at the site: metals (specifically
arsenic, cadmium, and lead) and VOCs (specifically PCE). In addition, based on the analytical
results from the Stage 1 and Stage 2 portions of the SI investigation, additional COCs were
identified including, but not limited to, the following: cobalt, copper, silver, zinc, 2-butanone (also
known as methyl ethyl ketone [MEK]), acetone, bromodichloromethane (BDCM), carbon
tetrachloride, methylene chloride (also known as dichloromethane), and m,p-xylene.

All Stage 1 soil vapor samples were analyzed for VOCs on-site during the sampling event by H&P
Mobile Geochemistry, Inc., a WESTON®-contracted mobile laboratory, using EPA Method H&P
8260SV (modified SW-846 Method). All Stage 1 subsurface soil matrix samples were submitted
under the EPA Contract Laboratory Program (CLP) to Bonner Analytical Testing Co. (Bonner)
for CLP Metals analysis using Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and
Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) (copper only) by EPA
CLP Analytical Services (CLPAS) ISM02.4. Due to trace metal interference identified within a
single sample delivery group, samples within that group were re-analyzed using ICP-AES for all
metal constituents (including copper) and only the revised results are discussed below.

All Stage 2 subsurface soil matrix and groundwater samples were submitted under the EPA CLP
to Bonner for CLP Metals analysis (using ICP-AES) by EPA CLPAS ISM02.4 or to Chemtech
Consulting Group for CLP Trace Volatiles analysis (groundwater) and CLP Low and Medium
Volatiles (soil) by EPA CLPAS SOM02.4.

All Stage 3 near-surface residential soil matrix data were submitted to Eurofins Environment
Testing - Tacoma and analyzed for CAM 17 metals (including mercury) (using ICP-AES) by EPA
Method 6010b and EPA Method 7471a (using Cold Vapor Atomic Absorption [CVAA]). ISM
samples were processed at the laboratory in accordance with Interstate Technology Regulatory
Council (ITRC) ISM-2 (October 2020) prior to analysis.

WESTON® validated the soil vapor data (Stage 1) and the near-surface soil matrix data (Stage 3)
internally. The EPA Region 9 Quality Assurance (QA) Office validated the subsurface soil matrix

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(Stage 1 and Stage 2) and groundwater (Stage 2) data. The complete validated analytical results
are presented in Attachment 7.

3.2.1 Action Levels

In accordance with the HRS, the action levels to establish an observed release to groundwater or
an area of observed soil contamination (AOC), as well as to establish an on-site source of
contaminated soil, are "significantly above background" concentrations. "Significantly above
background" is defined as three times the background concentration for all media. If the
background concentration is below the analytical quantitation limit, then the default background
level is the background sample quantitation limit (SQL). "Significantly above background" for
this scenario is defined as a detect in the media (i.e., concentration at or above the SQL) where the
analyte was not detected in the background media. In accordance with EPA, 1996 (Using Qualified
Data to Document an Observed Release and Observed Contamination), qualified data
(e.g., J-flagged) may be used to document an observed release or observed contamination by
chemical analysis under the HRS by the application of specific adjustment factors to the data (see
Attachment 10).

3.2.1.1 Source Action Level

(Groundwater Pathway) (see Table 6)

Soil matrix samples collected from Boring DMS-DP-10, which is located at the northeastern
portion of the site, approximately 70 ft southwest of the Main Office and 70 ft north of the
Warehouse, are designated as the source background soil samples for HRS purposes. Although the
selected source background location is situated within the operational area of the site, the exhibited
analyte concentrations in samples collected from this location appear unlikely to have been
significantly impacted by on-site historical operations. An on-site source of hazardous materials,
typically contaminated subsurface soils, must be established in order to assess whether a site has
impacted, or has the potential to impact, underlying groundwater.

The assigned source background concentration for each analyte was determined by amalgamating
the concentration data from each of the four discrete-depth soil samples. For any analyte with a
reported SQL exceedance in the dataset, the background concentration was conservatively
assigned as the arithmetic mean of the SQL-exceeding discrete-depth results plus three times the
sample standard deviation of these results. For any analyte without an SQL exceedance, the
background concentration was conservatively assigned as the maximum SQL value for that analyte
within the combined Stage 1 and Stage 2 datasets.

VOC analytes were not reported at concentrations above their respective SQLs in any of the four
discrete-depth source background soil samples. All antimony results reported for the source
background soil samples were qualified as "rejected" due to a matrix spike recovery outside of QA
criteria preventing the assigning of either a source background concentration or source action level

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for antimony in soil; however, antimony was not reported above SQLs within the Stage 1 or Stage
2 datasets. Metal analytes within the dataset that are not included within the Superfund Chemical
Data Matrix (SCDM); specifically, calcium, magnesium, potassium, and sodium; were not
assigned source action levels or evaluated as potential hazardous substance sources.

3.2.1.2	Groundwater Release Action Level

(Groundwater Pathway)

No groundwater monitoring wells are located on the Central Metal site. The nearest known
monitoring wells to the site are located on the adjacent-south Jack Engle & Company site (northern
parcel). Data collected from the seven-well monitoring network between approximately 1998 and
2010 have indicated a relatively low horizontal hydraulic gradient and a variable shallow
groundwater flow direction; predominately from south-southeast to southwest. As such, the
shallow groundwater flow direction beneath the Central Metal site is considered to be inadequately
defined and, therefore, neither a background groundwater location nor a groundwater release
action level can currently be assigned.

3.2.1.3	HRS Soil Screening Benchmark

(Soil Exposure Pathway) (see Fisure 11 and Table 9)

Soil samples collected during the October 2022 Stage 3 Background Sampling Event were used to
assign HRS soil screening benchmarks for metals in shallow soils. These project-specific
benchmarks were used as the criteria to determine if metal concentrations identified in residential
soils exceeded the HRS threshold of "significantly above background." This event included the
sampling of shallow soil samples within five designated background zones. These zones
encompassed a variety of land-use settings including: two public parks, two road verges
(e.g., parkway, greenbelt), and a tract of former residential lots that were being redeveloped into a
new public park. These zones were all located within 1 mile of the site and were specifically
selected to facilitate the estimation of an ambient urban metal concentration within shallow soil in
the vicinity of the site. At each background zone, shallow soil samples were collected using ISM
and four-point composite methodologies. The ISM analytical data was then averaged, first by zone,
then by land-use type, and finally across all zones, to establish estimated background soil
concentrations.

3.2.2 2019 EPA Stage 1 SI - Soil Vapor and Limited Soil Sampling

In April 2019, WESTON®, on behalf of EPA, conducted the Stage 1 SI sampling event at the
Central Metal site. The Stage 1 event included soil vapor and soil matrix sampling at 20 non-biased
sampling locations located across the site (SV-1 through SV-20), predominantly within the FTMA.
The primary objective of the Stage 1 portion of the investigation was to provide information on
the relative concentrations of metals and VOCs across the site to assist in the selection of
subsequent on-site soil matrix and groundwater sampling (i.e., Stage 2). However, when used in

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combination with the source action levels assigned, subsequent to the Stage 2 event
(see Section 3.2.1) the Stage 1 metals results can also be used under the HRS to establish hazardous
substance source areas at the site.

Between April 8 and April 11, 2019, 37 soil vapor probes were installed across the site, which
were subsequently analyzed using a WESTON-subcontracted mobile laboratory. The probes were
installed at two distinct depths (approximately 5 ft-bgs and 15 ft-bgs) using direct-push (DP)
technology. In addition, 38 soil matrix samples (not including duplicate or QA samples) were
collected during the investigation. Soil samples were collected from depths of approximately
2 ft-bgs and 10 ft-bgs at each location and submitted to a fixed laboratory for metals analyses. Due
to refusal issues, a soil vapor sample could not be collected from either of the targeted depths at
SV-6 or from the 15-ft targeted depth at SV-13, and soil matrix samples could not be collected
from the 10-ft targeted depths at either location.

3.2.2.1 Stage 1 Soil Vapor Results for VOCs

(see Figure 5 and Table 5)

Numerous VOC analytes were identified at detectable concentrations during the survey. Although
soil vapor benchmarks are not applicable within the HRS, for contextual purposes, the soil vapor
data collected during the investigation are compared to the May 2023 EPA Resident and
Commercial Sub-slab and Near source Soil Gas VISLs. Three analytes, BDCM, carbon
tetrachloride, and PCE, exceeded their respective Resident VISLs with BDCM and PCE also
slightly exceeding their respective Commercial VISLs. TCE was not detected above reporting
limits during the survey.

The maximum BDCM concentration of 13 |ig/m3 was identified in the 6 ft-bgs sample collected
from SV-20 (southern portion of the FRA). The Resident and Commercial VISLs for BDCM are
2.5 |ig/m3 and 11 |ig/m3, respectively.

The maximum carbon tetrachloride concentration of 18 |ig/m3 was identified in the 6 ft-bgs sample
collected from SV-10 (northwestern portion of the Warehouse). The Resident and Commercial
VISLs for carbon tetrachloride are 16 |ig/m3 and 68 |ig/m3, respectively.

The maximum PCE concentration of 2,530 |ig/m3 was identified in the 6.5 ft-bgs sample collected
from SV-14 (central portion of the Warehouse). The 16 ft-bgs sample from this location exhibited
a PCE concentration of 2,190 |ig/m3. PCE was identified in 34 of the remaining 35 samples with
concentrations that ranged from 8.0 |ig/m3 to 339 |ig/m3. The Resident and Commercial VISLs for
PCE are 360 |ig/m3 and 1,570 |ig/m3, respectively.

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3.2.2.2 Stage 1 Soil Sampling Results for Metals

(see Figure 6 and Table 6)

Metals identified at concentrations at or above their corresponding source action level in soil
matrix source samples collected during the Stage 1 sampling event include arsenic, cadmium,
cobalt, copper, lead, silver, and zinc. The most elevated metal concentrations identified during this
event were generally exhibited in the 2 ft-bgs samples collected from adjacent west to the
Warehouse and within the southern portion of the Warehouse. For contextual purposes, these
results are also compared to the May 2023 EPA Residential and Industrial RSLs; however, RSLs
are not appropriate for use as benchmarks under the HRS.

The assigned arsenic source action level of 14 mg/kg was exceeded by 2 of the 38 samples with a
maximum concentration of 22 mg/kg (qualified as estimated), which was exhibited in the 2 ft-bgs
sample collected from SV-12. The 2 ft-bgs sample collected from SV-13 exhibited an arsenic
concentration of 16 mg/kg (qualified as estimated). The Residential and Industrial RSLs for arsenic
are 0.68 mg/kg and 3.0 mg/kg, respectively.

The assigned cadmium source action level of 0.66 mg/kg was exceeded by 4 of the 38 samples
with a maximum concentration of 2.5 mg/kg, which was exhibited in the 2 ft-bgs sample collected
from SV-6. No deep sample was collected from SV-6 due to early refusal. The 2 ft-bgs samples
collected from SV-9, SV-17, and SV-19 exhibited cadmium concentrations of 1.3 mg/kg (qualified
as estimated), 1.4 mg/kg, and 1.1 mg/kg, respectively. The Residential and Industrial RSLs for
cadmium are 7.1 mg/kg and 100 mg/kg, respectively.

The assigned cobalt source action level of 69 mg/kg was exceeded by 1 of the 38 samples with a
concentration of 91 mg/kg, which was exhibited in the 2 ft-bgs sample collected from SV-9. The
Residential and Industrial RSLs for cobalt are 23 mg/kg and 350 mg/kg, respectively.

The assigned copper source action level of 111 mg/kg was exceeded by 4 of the 38 samples with
a maximum concentration of 165 mg/kg (qualified as estimated), which was exhibited in the
2 ft-bgs sample collected from SV-12. The 2 ft-bgs samples collected from SV-6, SV-9, and SV-17
exhibited copper concentrations of 133 mg/kg (qualified as estimated), 114 mg/kg, and 139 mg/kg,
respectively. The Residential and Industrial RSLs for copper are 3,100 mg/kg and 47,000 mg/kg,
respectively.

The assigned lead source action level of 41 mg/kg was exceeded by 5 of the 38 samples with a
maximum concentration of 338 mg/kg, which was exhibited in the 2 ft-bgs sample collected from
SV-6. No deep sample was collected from SV-6 due to early refusal. The 2 ft-bgs samples collected
from SV-9, SV-17, SV-18, and SV-19 exhibited lead concentrations of 170 mg/kg, 301 mg/kg
(qualified as biased high), 170 mg/kg (qualified as biased high), and 90 mg/kg (qualified as biased
high), respectively. The Residential and Industrial RSLs for lead are 400 mg/kg and 800 mg/kg,
respectively.

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The assigned silver source action level of 1.3 mg/kg was exceeded by 4 of the 38 samples with a
maximum concentration of 5.0 mg/kg, which was exhibited in the 2 ft-bgs sample collected from
SV-6. No deep sample was collected from SV-6 due to early refusal. The 2 ft-bgs samples collected
from SV-9, SV-12, and SV-13 exhibited silver concentrations of 4.3 mg/kg (qualified as
estimated), 2.4 mg/kg (qualified as estimated), and 1.4 mg/kg (qualified as estimated),
respectively. The Residential and Industrial RSLs for silver are 390 mg/kg and 5,800 mg/kg,
respectively.

The assigned zinc source action level of 450 mg/kg was exceeded by 3 of the 38 samples with a
maximum concentration of 778 mg/kg (qualified as biased high), which was exhibited in the
2 ft-bgs sample collected from SV-17. The field duplicate for this sample exhibited a zinc
concentration of 464 mg/kg (qualified as biased high). The 2 ft-bgs samples collected from SV-6,
and SV-19 exhibited zinc concentrations of 490 mg/kg (qualified as estimated) and 612 mg/kg
(qualified as biased high), respectively. The Residential and Industrial RSLs for zinc are 23,000
mg/kg and 350,000 mg/kg, respectively.

3.2.3 2019 EPA Stage 2 SI - Soil and Groundwater Sampling

In June 2019, WESTON®, on behalf of EPA, conducted the Stage 2 SI sampling event at the
Central Metal site. The Stage 2 event included both soil and groundwater sampling at
selectively-biased sampling locations located across the site with samples analyzed for VOCs and
metals. The primary objective of the Stage 2 portion of the investigation was to collect analytical
data from site soils and groundwater to determine if an on-site hazardous substance source existed
at the site and, if present, if it was a potential source of area-wide groundwater contamination.

Between June 17, 2019 and June 20, 2019, ten soil borings were advanced using DP technology
to a maximum depth of 17 ft-bgs, and five groundwater borings were advanced using Cone
Penetration Testing (CPT) technology to a maximum depth of 101 ft-bgs. Within each soil boring,
samples were collected from four distinct depths of approximately 2 ft-bgs, 5 ft-bgs, 10 ft-bgs, and
15 ft-bgs. Forty soil samples (not included duplicate or QA samples) were submitted for
fixed-laboratory VOC and metals analysis. Within each groundwater boring, a single groundwater
sample was collected from the top of the underlying Gaspur aquifer. No perched or semi-perched
water was identified between the ground surface and the top of the aquifer. Five groundwater
samples (not including duplicate or QA samples) were submitted for fixed-laboratory VOC and
total (i.e., not dissolved) metals analysis.

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3.2.3.1 Stage 2 Sampling Results for VOCs

(see Figure 8 and Table 8)

Stage 2 - VOC Results in Soil

The only VOC identified at a concentration at or above its corresponding source action level in
soil matrix source samples collected during the Stage 2 sampling event was acetone. Four
additional VOC analytes were identified at detectable concentrations during the event including
2-butanone (also known as MEK), methylene chloride (also known as dichloromethane),
m,p-xylene, and PCE. 2-butanone, acetone, and methylene chloride are common laboratory
contaminants. For contextual purposes, these results are also compared to the May 2023 EPA
Residential and Industrial RSLs; however, RSLs are not appropriate for use as benchmarks under
the HRS.

The assigned acetone source action level of 31 |ig/kg was exceeded by 2 of the 40 samples with a
maximum concentration of 93 |ig/kg (qualified as biased high), which was exhibited in the 3 ft-bgs
sample collected from DP-3. The 5 ft-bgs sample collected from DP-8 exhibited an acetone
concentration of 35 |ig/kg (qualified as biased high). The Residential and Industrial RSLs for
acetone are 70,000,000 |ig/kg and 1,100,000,000 ng/kg, respectively.

PCE was only identified in a single sample, which was collected from 2 ft-bgs at DP-6 (central
portion of Warehouse and adjacent to the maximum PCE result identified during the Stage 1 Soil
Vapor Survey). This sample exhibited a PCE concentration of 2.2 |ig/kg (qualified as estimated),
which was below the SQL of 6.6 |ig/kg. The assigned PCE source action level is 16 |ig/kg. The
Residential and Industrial RSLs for PCE are 24,000 |ig/kg and 100,000 |ig/kg, respectively.

Stage 2 - VOC Results in Groundwater

The only VOC analyte identified at a concentration at or above its corresponding SQL during the
Stage 2 sampling event was acetone. Additional VOC analytes identified at concentrations below
their SQL, but above their MDL, include 2-butanone (also known as MEK); benzene; carbon
disulfide; m,p-xylene; toluene; trans 1,2-dichloroethylene (trans-1,2-DCE); and TCE. For
contextual purposes, these results are also compared to the EPA MCLs, where applicable; although
MCLs are not appropriate for use as benchmarks to establish a hazardous substance release under
the HRS. Insufficient data was available to assign groundwater release action levels for the project
(see Section 3.2.1).

The maximum acetone concentration of 14 |ig/L was exhibited in the groundwater sample
collected from CPT-4. The samples collected from CPT-1, CPT-2, CPT-3, and CPT-5 exhibited
concentrations of 3.1 |ig/L (qualified as estimated), 4.6 |ig/L (qualified as estimated), 3.6 |ig/L
(qualified as estimated), and 5.1 |ig/L, respectively. Acetone does not currently have a published
MCL.

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Chlorinated VOCs were identified in 2 of the 5 groundwater samples collected during the event.
Trans-1,2-DCE was identified in the samples collected from CPT-2 and CPT-4 at concentrations
of 0.12 |ig/L (qualified as estimated) and 0.15 |ig/L (qualified as estimated), respectively. TCE
was identified in the sample collected from CPT-2, at a concentration of 0.21 |ig/L (qualified as
estimated). The SQL for both of these analytes in both of these samples is 0.50 |ig/L. The MCLs
for trans-1,2-DCE and TCE are 100 |ig/L and 5.0 |ig/L, respectively.

3.2.3.2 Stage 2 Sampling Results for Metals

(see Figure 7 and Table 7)

Stage 2 - Metal Results in Soil

Metals identified at concentrations at or above their corresponding action level in soil matrix
source samples collected during the Stage 2 sampling event include cadmium, copper, lead, silver,
and zinc. The most elevated metal concentrations identified during this event were generally
exhibited in the 2 ft-bgs sample collected from within the southern portion of the Warehouse. For
contextual purposes, these results are also compared to the May 2023 EPA Residential and
Industrial RSLs; however, RSLs are not appropriate for use as benchmarks under the HRS.

The assigned cadmium source action level of 0.66 mg/kg was exceeded by 4 of the 40 samples
with a maximum concentration of 7.6 mg/kg (qualified as estimated), which was exhibited in the
2 ft-bgs sample collected from DP-7. The 2 ft-bgs sample collected from DP-1 exhibited a
cadmium concentration of 1.1 mg/kg (qualified as estimated). The 2 ft-bgs and 5 ft-bgs samples
collected from DP-9 exhibited cadmium concentrations of 2.4 mg/kg (qualified as estimated) and
0.74 mg/kg (qualified as estimated), respectively. The Residential and Industrial RSLs for
cadmium are 7.1 mg/kg and 100 mg/kg, respectively.

The assigned copper source action level of 111 mg/kg was exceeded by 1 of the 40 samples with
a concentration of 245 mg/kg (qualified as estimated), which was exhibited in the 2 ft-bgs sample
collected from DP-7. The Residential and Industrial RSLs for copper are 3,100 mg/kg and
47,000 mg/kg, respectively.

The assigned lead source action level of 41 mg/kg was exceeded by 6 of the 40 samples with a
maximum concentration of 612 mg/kg, which was exhibited in the 2 ft-bgs sample collected from
DP-7. The 2 ft-bgs samples collected from DP-1, DP-2, DP-4, DP-8, and DP-9 exhibited lead
concentrations of 138 mg/kg, 138 mg/kg, 203 mg/kg, 49 mg/kg, and 152 mg/kg, respectively. The
Residential and Industrial RSLs for lead are 400 mg/kg and 800 mg/kg, respectively.

The assigned silver source action level of 1.3 mg/kg was exceeded by 4 of the 40 samples with a
maximum concentration of 1.9 mg/kg (qualified as estimated), which was exhibited in both the
2 ft-bgs sample collected from DP-7 and the 5 ft-bgs sample collected from DP-8. The 2 ft-bgs
samples collected from DP-1 and DP-8 exhibited silver concentrations of 1.7 mg/kg (qualified as

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estimated) and 1.3 mg/kg (qualified as estimated), respectively. The Residential and Industrial
RSLs for silver are 390 mg/kg and 5,800 mg/kg, respectively.

The assigned zinc source action level of 450 mg/kg was exceeded by 2 of the 40 samples with a
maximum concentration of 3,160 mg/kg, which was exhibited in the 2 ft-bgs sample collected
from DP-7. The 2 ft-bgs sample collected from DP-9 exhibited a zinc concentration of 661 mg/kg.
The Residential and Industrial RSLs for zinc are 23,000 mg/kg and 350,000 mg/kg, respectively.

Stage 2 - Metal Results in Groundwater

Metals identified at concentrations at or above their corresponding SQL in groundwater samples
collected during the Stage 2 sampling event include aluminum, arsenic, barium, beryllium,
cadmium, chromium, cobalt, copper, iron, lead, manganese, nickel, silver, vanadium, and zinc.
Human-health regulatory benchmarks, such as MCLs, are not appropriate for use as benchmarks
to establish a hazardous substance release under the HRS. Additionally, samples were analyzed
for total metals and, as such, analytical results are not comparable to regulatory benchmarks
derived from dissolved metals criteria, such as MCLs. Groundwater release action levels for the
project were not assigned due to insufficient information on the hydrogeologic conditions beneath
the site (see Section 3.2.1).

Total metal concentrations were generally found to be highest in the samples collected from CPT-2
(located at the west-central portion of the site) and CPT-4 (located at the southeastern corner of
the site). Specifically, samples collected from these locations generally exhibited total metal
concentrations approximately 10 to 20 times higher than those exhibited at the other three
groundwater sample locations. Total arsenic concentrations ranged from 28 |ig/L (qualified as
estimated) at CPT-3 to 100 |ig/L (qualified as estimated) at CPT-4. Total cadmium concentrations
ranged from non-detect (less than 5.0 |ig/L) at CPT-1 and CPT-5 to 50 |ig/L at CPT-2. Total cobalt
concentrations ranged from 51 |ig/L (qualified as estimated) at CPT-5 to 590 |ig/L at CPT-2. Total
lead concentrations ranged from 43 |ig/L at CPT-5 to 935 |ig/L (qualified as biased low) at CPT-4.
Total silver concentrations ranged from 4.5 |ig/L (qualified as estimated) to 63 |ig/L (qualified as
estimated) at CPT-4. Total zinc concentrations ranged from 476 |ig/L at CPT-5 to 33,300 |ig/L at
CPT-4.

3.2.4 2022 EPA Stage 3 SI - Residential Soil Sampling

3.2.4.1 Stage 3 SI - Residential Phase

(see Figure 9, Figure 10, Figure 12, and Figure 13 and Table 9 through Table 13)

Between August 2022 and October 2022, WESTON®, on behalf of EPA, conducted the Stage 3 SI
sampling event at the Central Metal site. The Stage 3 event, which was conducted in two phases,
included near-surface soil matrix sampling at both selectively biased and non-biased locations
within residential yards and publicly accessible spaces in the vicinity of the site. The first phase of

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the event, the residential phase, was focused on: collecting shallow soil release samples from
downwind residential properties to determine if hazardous concentrations of metals, primarily
arsenic and lead, were present; and to evaluate the spatial distribution of identified metals
contamination to determine if the impacts were attributable to historical activities at the Central
Metal facility. The second phase of the event, the background phase, was focused on collecting
shallow soil from public spaces, primarily parks and road verges, in areas outside of the potential
influence of potential contamination originating from the site and in a variety of directions from
the site.

Prior to completing the first phase of the event, the site-adjacent residential neighborhoods were
assessed based on their potential risk of being impacted by airborne deposition originating from
the site, specifically with respect to distance and downwind direction. The portions of these
neighborhoods deemed to be most at risk were divided into four residential zones (RZs) based on
distance from the site and wind direction. Three zones (RZ-1 through RZ-3) were delineated within
the Walnut Park neighborhood, which is located downwind with respect to the primary wind
direction, and one zone (RZ-4) was delineated within the Florence-Firestone neighborhood, which
is located downwind with respect to the secondary wind direction. Each RZ was further subdivided
into three residential subzones (sub-RZs) based on proximity to primary and secondary wind
directions, resulting in twelve sub-RZs, each comprised of approximately 40 residential properties.
Subsequently, a comprehensive desktop review was completed to identify the residential
properties within each subzone most suitable for sampling, primarily based on the amount of
accessible unpaved areas, and EPA proceeded to request voluntary access to the identified
properties.

Between August 1, 2022 and August 9, 2022, shallow soil samples (i.e., upper 4 inches) were
collected from 83 properties within the adjacent residential neighborhoods to the site. Sixty-three
of these properties were located within the Walnut Park neighborhood to the east of the site and
20 of these properties were located within the Florence-Firestone neighborhood to the northwest
of the site. Between 5 and 10 properties were sampled within each of the 12 sub-RZs. The event
included two different types of sampling methodology, four-point composite and ISM. The
four-point composite samples were collected by taking four discrete soil aliquots within a 2-foot
diameter circle, homogenizing on-site, and submitting the appropriate volume to the laboratory as
single sample. The ISM samples were collected by taking between 30 and 60 discrete increments,
homogenizing on-site, and submitting the entire volume to the laboratory for additional preparation
in accordance with ITRC guidance. Three four-point composite samples were collected on each
sampled residential property and one ISM sample was collected for each sub-RZ. A total of 249
four-point composite shallow soil samples and 12 ISM samples (not including duplicate, triplicate,
or QA samples) were submitted for fixed-laboratory metals analysis during the residential phase
of the Stage 3 event.

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Residential Shallow Sampling Results

Metals identified at concentrations at or above their corresponding HRS soil screening benchmark
in soil matrix release samples (i.e., four-point composite samples) collected during the Stage 3
event include antimony, arsenic, barium, cadmium, chromium, copper, lead, mercury,
molybdenum, and zinc. HRS soil screening benchmarks were assigned per the methodology
described in Section 3.2.1.3. ISM sample results are presented as the arithmetic mean of field QA
(i.e., triplicate) samples, where applicable. For contextual purposes, these results are also
compared to the May 2023 EPA Residential and Industrial RSLs; however, RSLs are not
appropriate for use as benchmarks under the HRS.

The assigned antimony HRS soil screening benchmark of 5.9 mg/kg was exceeded by 1 of the 249
four-point composite samples with a concentration of 25 mg/kg. One of the 83 sampled properties
exhibited at least one sample that exceeded the assigned antimony HRS soil screening benchmark.
ISM samples exhibited antimony concentrations that ranged from 0.56 mg/kg (qualified as
estimated) at RZ-2b to 1.6 mg/kg (qualified as estimated) at RZ-4a and RZ-4b. The Residential
and Industrial RSLs for antimony are 31 mg/kg and 470 mg/kg, respectively.

The assigned arsenic HRS soil screening benchmark of 22 mg/kg was exceeded by 5 of the 249
four-point composite samples with a maximum concentration of 64 mg/kg. Three of the 83
sampled properties exhibited at least one sample that exceeded the assigned arsenic HRS soil
screening benchmark. ISM samples exhibited arsenic concentrations that ranged from 3.3 mg/kg
(qualified as estimated) at RZ-3c to 6.6 mg/kg at RZ-la. The Residential and Industrial RSLs for
arsenic are 0.68 mg/kg and 3.0 mg/kg, respectively.

The assigned barium HRS soil screening benchmark of 459 mg/kg was exceeded by 3 of the 249
four-point composite samples with a maximum concentration of 1,300 mg/kg. Three of the 83
sampled properties exhibited at least one sample that exceeded the assigned barium HRS soil
screening benchmark. ISM samples exhibited barium concentrations that ranged from 130 mg/kg
at RZ-3a, RZ-3c, and RZ-4a to 280 mg/kg at RZ-4b. The Residential and Industrial RSLs for
barium are 15,000 mg/kg and 220,000 mg/kg, respectively.

The assigned cadmium HRS soil screening benchmark of 3.1 mg/kg was exceeded by 8 of the 249
four-point composite samples with a maximum concentration of 6.5 mg/kg. Eight of the 83
sampled properties exhibited at least one sample that exceeded the assigned cadmium HRS soil
screening benchmark. ISM samples exhibited cadmium concentrations that ranged from 0.87
mg/kg (qualified as estimated) atRZ-3ato 1.8 mg/kg (qualified as estimated) atRZ-lc andRZ-4c.
The Residential and Industrial RSLs for cadmium are 7.1 mg/kg and 100 mg/kg, respectively.

The assigned chromium HRS soil screening benchmark of 65 mg/kg was exceeded by 2 of the 249
four-point composite samples with a maximum concentration of 100 mg/kg. Two of the 83
sampled properties exhibited at least one sample that exceeded the assigned chromium HRS soil

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screening benchmark. ISM samples exhibited chromium concentrations that ranged from 16 mg/kg
at RZ-4a to 28 mg/kg at RZ-lb. Residential and Industrial RSLs for total chromium have not been
established.

The assigned copper HRS soil screening benchmark of 142 mg/kg was exceeded by 5 of the 249
four-point composite samples with a maximum concentration of 700 mg/kg. Five of the 83
sampled properties exhibited at least one sample that exceeded the assigned copper HRS soil
screening benchmark. ISM samples exhibited copper concentrations that ranged from 32 mg/kg at
RZ-3a to 61 mg/kg at RZ-4c. The Residential and Industrial RSLs for copper are 3,100 mg/kg and
47,000 mg/kg, respectively.

The assigned lead HRS soil screening benchmark of 401 mg/kg was exceeded by 12 of the 249
four-point composite samples with a maximum concentration of 960 mg/kg. Eight of the 83
sampled properties exhibited at least one sample that exceeded the assigned lead HRS soil
screening benchmark. ISM samples exhibited lead concentrations that ranged from 147 mg/kg at
RZ-3c to 243 mg/kg at RZ-2a. The Residential and Industrial RSLs for lead are 400 mg/kg and
800 mg/kg, respectively.

The assigned mercury HRS soil screening benchmark of 0.53 mg/kg was exceeded by 9 of the 249
four-point composite samples with a maximum concentration of 1.8 mg/kg. Nine of the 83 sampled
properties exhibited at least one sample that exceeded the assigned mercury HRS soil screening
benchmark. ISM samples exhibited mercury concentrations that ranged from 0.093 mg/kg at
RZ-4a to 0.52 mg/kg (qualified as estimated) at RZ-2a. The Residential and Industrial RSLs for
mercury are 11 mg/kg and 46 mg/kg, respectively.

The assigned molybdenum HRS soil screening benchmark of 3.3 mg/kg was exceeded by 2 of the
249 four-point composite samples with a maximum concentration of 4.3 mg/kg. Two of the 83
sampled properties exhibited at least one sample that exceeded the assigned molybdenum HRS
soil screening benchmark. ISM samples exhibited molybdenum concentrations that ranged from
0.54 mg/kg (qualified as estimated) at RZ-2b to 1.4 mg/kg (qualified as estimated) at RZ-4c. The
Residential and Industrial RSLs for molybdenum are 390 mg/kg and 5,800 mg/kg, respectively.

The assigned zinc HRS soil screening benchmark of 630 mg/kg was exceeded by 7 of the 249
four-point composite samples with a maximum concentration of 800 mg/kg. Seven of the 83
sampled properties exhibited at least one sample that exceeded the assigned zinc HRS soil
screening benchmark. ISM samples exhibited zinc concentrations that ranged from 226 mg/kg
(qualified as estimated) at RZ-3c to 380 mg/kg at RZ-4c. The Residential and Industrial RSLs for
zinc are 23,000 mg/kg and 350,000 mg/kg, respectively.

None of the four-point composite samples collected during the residential sampling event
exceeded the assigned HRS soil screening benchmarks for beryllium, cobalt, nickel, selenium,

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silver, thallium, or vanadium. The soil screening benchmarks and RSLs for these analytes are
provided in Table 9.

3.2.4.2 Stage 3 SI - Background Phase

(see Figure 14 through Figure 19 and Table 14)

Between October 4, 2022 and October 10, 2022, shallow soil samples were collected from five
publicly accessible areas using a similar methodology to the August 2022 residential phase. Each
of the five publicly accessible areas was designated as a background sampling zone (BZ) with each
BZ further divided into three background subzones (sub-BZs). Sampled BZs included: Roosevelt
Park (BZ-1), located approximately 0.75 mile northwest of the site; the in-development Walnut
Park Pocket Park (WPPP) (BZ-2), located approximately 0.5 mile northeast of the site; the Garden
View Road Verge (BZ-3), located approximately 1.0 mile east of the site; the S. Gate Road Verge
(BZ-4), located approximately 1.0 mile southeast of the site; and Washington Park (BZ-5), located
approximately 0.75 mile southwest of the site. Only one subzone was delineated within WPPP
(BZ-2) due to its relatively small size. Within each sub-BZ, five four-point composite samples
were collected, and one ISM sample was collected. In addition, a portion of Cudahy Street located
within the northern portion of the residential phase sampling area, was delineated as reference
zone/subzone and sampled during the event using the same methodology as the background
subzones. This reference zone was sampled to allow additional correlation and analysis between
background road verge zones and those within the site's potential area of influence. Seventy
four-point composite shallow soil samples and 14 ISM samples (not including duplicate, triplicate,
or QA samples) were submitted for fixed-laboratory metals analysis during the background phase
of the Stage 3 event.

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4. HAZARD RANKING SYSTEM FACTORS

The HRS is the principal mechanism that EPA uses to place uncontrolled waste sites on the NPL.
It is a numerically based scoring system that uses information from initial, limited investigations
to assess the relative potential of sites to pose a threat to human health or the environment. The
HRS uses a structured analysis approach to scoring sites. This approach assigns numerical values
to factors that relate to risk based on conditions at the site. The factors are grouped into three
categories:

¦	Likelihood that a site has released or has the potential to release hazardous substances
into the environment

¦	Characteristics of the waste (e.g., toxicity and waste quantity)

¦	People or sensitive environments (targets) affected by the release
Four pathways can be scored under the HRS:

¦	Groundwater migration (drinking water)

¦	Surface water migration (drinking water, human food chain, sensitive environments)

¦	Soil exposure and subsurface intrusion (population, sensitive environments)

¦	Air migration (population, sensitive environments)

4.1 Sources of Contamination

For HRS purposes, a source is defined as an area where a hazardous substance has been deposited,
stored, disposed, or placed, plus those soils that have become contaminated from migration of a
hazardous substance.

Potential hazardous substance sources associated with the Central Metal site include, but may not
be limited to, the following:

¦	On-site soils contaminated with metals, which are likely a result of historical on-site
operations. Arsenic, cadmium, cobalt, copper, lead, silver, and zinc were identified
during the 2019 SI investigations at concentrations significantly above background (see
Section 3.2.2 and Section 3.2.3).

¦	On-site soils contaminated with VOCs, which are likely a result of historical on-site
operations. Acetone was identified during the 2019 SI investigations at a concentration
significantly above background (see Section 3.2.3).

¦	Historical waste debris piles that were documented to be present on site from
approximately 2003 through 2018. Pile samples collected by state and local agencies
in 2011 and 2018 indicated concentrations of arsenic, cadmium, lead, and zinc at

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concentrations exceeding state hazardous waste benchmarks (Attachment 2;

Brash, 2019; DTSC, 2011).

4.2 Groundwater Pathway

In determining a score for the groundwater migration pathway, the HRS evaluates the following
factors: (1) the likelihood that sources at a site actually have released, or potentially could release,
hazardous substances to groundwater; (2) the characteristics of the hazardous substances that are
available for a release (i.e., toxicity, mobility, and quantity); and (3) the people (targets) who
actually have been, or potentially could be, impacted by the release. For the targets component of
the evaluation, the HRS focuses on the number of people who regularly obtain their drinking water
from wells that are located within 4 miles of the site. The HRS emphasizes drinking water usage
over other uses of groundwater (e.g., food crop irrigation and livestock watering) because, as a
screening tool, it is designed to give the greatest weight to the most direct and extensively studied
exposure routes.

4.2.1 Hydrogeological Setting

(see Table 15)

The Central Metal site lies within the Central Subbasin in the Coastal Plain of the Los Angeles
Groundwater Basin. The Central Subbasin is generally bound to the north by the folded, uplifted
and eroded Tertiary basement rocks of the La Brea High surface divide; to the northeast and east
by the less permeable Tertiary rocks of the Elysian, Repetto, Merced, and Puente Hills; to the
southeast by the Coyote Creek flood control channel (approximate Los Angeles County/Orange
County boundary); and to the southwest by the Newport Inglewood Uplift, a regional anticline
associated with the Newport Inglewood fault system. Geologic units typically found beneath the
subbasin include Holocene-age alluvium, the upper Pleistocene Lakewood Formation, and the
lower Pleistocene San Pedro Formation. The Los Angeles and San Gabriel rivers pass across the
surface of the subbasin, primarily by way of engineered concrete channels, on their way to the
Pacific Ocean. The average net annual precipitation in the subbasin is approximately 12 inches
(DWR, 1961; DWR, 2004).

The Central Subbasin has historically been divided into the Los Angeles Forebay at the northwest,
the Montebello Forebay at the north, the Whittier Area at the northeast, and the Central Basin
Pressure Area at the center and southwest. However, these areal distinctions are appropriate for
geographical purposes only and do not accurately represent hydrogeologic conditions within the
areas. In actuality, the hydrogeologic forebays, which are generally characterized by unconfined
and relatively interconnected aquifer systems, are limited to only small regions within the greater
Forebay areas. The Montebello Forebay, as well as the Los Angeles Forebay to a lesser degree,
serve as the primary groundwater recharge areas for both shallow and deep aquifers across the
entirety of the subbasin. The Central Basin Pressure Area is generally characterized by confined

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aquifer systems separated by relatively impermeable clay layers, although semipermeable zones
within these layers allow aquifers to be interconnected in some areas. These semipermeable zones
gradually decrease in frequency and magnitude with increasing distance from the forebays
(DWR, 1961; DWR, 2004).

The site is located within the southern portion of the Los Angeles Forebay geographical area;
however, underlying hydrogeologic conditions are more accurately represented by those typically
identified with the Central Basin Pressure area. Groundwater beneath the site is typically found
within the coarser-grained sediments of the Holocene alluvium (Gaspur aquifer), the upper
Pleistocene Lakewood Formation (Exposition and Gage aquifers), and the lower Pleistocene San
Pedro Formation (Hollydale, Lynwood, Silverado, and Sunnyside aquifers). Throughout much of
the subbasin, the Jefferson aquifer is described as present between the Hollydale and Lynwood
aquifers; however, this aquifer is reportedly absent in the vicinity of the site. The elevations and
depths of the aquifers underlying the site, as estimated from published source material, are
presented in Table 15. Irregular patches of a perched or semi-perched aquifer are also present
within the Holocene alluvium throughout much of the subbasin. Although significant amounts of
water can be found within these perched water-bearing zones, they are often discontinuous over
relatively short distances and have historically only had minimal economic benefit. Thus, these
perched aquifers do not meet the criteria of an "aquifer" for HRS purposes (DWR, 1961;
DWR, 2004).

For the purposes of this SI, the Gaspur aquifer beneath the site is defined as being between 90 and
145 ft-bgs; however, the base of this aquifer is considered approximate because no information
was found regarding site-specific lithology below approximately 111 ft-bgs. Water-bearing units
identified at shallower depths are defined as being associated with one or more perched (or
semiperched) aquifers. These designations were assigned primarily based on CPT lithological
profile reports that were developed during the completion of the Stage 2 SI investigation. The CPT
Lithological Profile Reports developed during the SI investigation are presented in Attachment 6
(DWR, 1961).

Throughout much of the subbasin, the Pleistocene-age aquifers are under confined conditions due
to the presence of fine-grained, low-permeability interbedded sediments. Although these fine
grained sediments, or aquicludes, generally restrict the downward migration of groundwater from
overlying aquifers, semipermeable zones within the aquicludes allow aquifers to be interconnected
in some areas. In addition, hydrogeologic modeling of multi-aquifer systems similar to that found
in the Central Basin Pressure Area, has shown that groundwater wells screened across multiple
aquifers (or wells with improperly constructed annular seals that cross multiple aquifers) can act
as a direct pathway for the migration of significant volumes of shallow groundwater into deep
confined aquifers when vertical hydraulic head variations create a downward hydraulic gradient.
The process of this downward migration is increased in areas where the deeper aquifers have
periods of high-volume pumping such as seasonal demand. Furthermore, additional studies have

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shown that liquids that are denser than water (i.e., dense non-aqueous phase liquids such as PCE
and TCE) can migrate downward through a multi-aquifer well even when vertical hydraulic head
variations create an upward hydraulic gradient. As of the end of the 2012-2013 fiscal year, there
were 537 known extraction wells (306 active and 231 inactive) within the subbasin
(AwwaRF, 2006; DWR, 1961; DWR, 2013; Johnson et al., 2011).

The State of California, Department of Water Resources' Bulletin No. 104 (Planned Utilization of
the Ground Water Basins of the Coastal Plain of Los Angeles County) - Appendix A presents
"idealized" geologic cross-sections transecting the Central Subbasin. These cross-sections indicate
apparent areas of merged aquifers throughout much of the subbasin. However, with the exception
of the Gaspur and Exposition aquifers, which are presented as merged throughout much of the
local area, no zones of merged aquifers were indicated in the vicinity of the site. Aquifer
interconnection within 2 miles of the site has been documented between the Gaspur and Exposition
aquifers. Aquifer interconnections within 2 miles of the site have not been established between the
Exposition and Gage, the Gage and Hollydale, the Hollydale and Lynwood, the Lynwood and
Silverado, and the Silverado and Sunnyside (DWR, 1961).

The regional groundwater flow direction within the subbasin, which was calculated using data
from wells screened within the Upper San Pedro Formation (Lynwood through Sunnyside
aquifers), is generally to the southwest. Based upon data collected between 2007 and 2022, flow
within these deeper aquifers in the vicinity of the site trended towards the southwest with temporal
variations from west-southwest to south-southwest (WRD, 2023).

A perched (or semiperched) aquifer was not encountered during the 2019 Stage 2 SI investigation.
However, because of the highly irregular and discontinuous nature of these perched water-bearing
zones, there remains a potential that perched groundwater may exist beneath one or more portions
of the site. In addition, based on the CPT lithological profiles, which are provided in
Attachment 6, coarser units that have the potential to be water-bearing do exist between the
ground surface and the depth of first groundwater, suggesting that perched water may be seasonally
present beneath the site.

During the 2019 SI investigation, groundwater beneath the site was first encountered at depths that
ranged from approximately 98 ft-bgs to 101 ft-bgs, consistent with the expected depths of the
Gaspur aquifer. No groundwater monitoring wells are located on site. Groundwater data collected
from between 1998 and 2010 on the property located immediately south of the site have reported
a relatively low horizontal hydraulic gradient and a variable shallow groundwater flow direction;
predominately from south-southeast to southwest. As such, the groundwater flow direction in the
Gaspur aquifer beneath the site, as well as in the aquifers between the Gaspur and Lynwood, is
considered to be unknown (AMEC, 2014).

During the SI investigation, the subsurface geology at the site was logged to a depth of 21 ft-bgs,
the base of continuous coring. Subsurface materials primarily consisted of medium brown to light

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grey, fine- to coarse-grained silty-sands with interbedded lenses (typically less than 24 inches and
most frequently observed between approximately 10 ft-bgs and 15 ft-bgs) of sands and sandy silts,
which generally increased in grain size with depth. A dark brown-green clay was frequently
encountered between approximately 18 ft-bgs and 20 ft-bgs. The lithological identifications are
described in the sample logbook (Attachment 9).

Additionally, during the SI investigation, CPT technology was used to estimate the subsurface
lithology to a total depth of approximately 111 ft-bgs. The interpreted Soil Behavior Type
generated from the CPT generally indicated sand units from approximately 8 ft-bgs to 13 ft-bgs,
38 ft-bgs to 40 ft-bgs, 62 ft-bgs to 67 ft-bgs, 85 ft-bgs to 87 ft-bgs, and 90 ft-bgs to 111 ft-bgs
(total depth). Between these sand units, the soils were generally indicated as sandy-silts and
silty-sands with thin (less than 4 ft) interbedded lens of finer grained materials (e.g., clays). The
CPT Lithological Profile Reports are presented in Attachment 6.

4.2.2	Groundwater Targets

(see Table 16)

The nearest HRS-eligible drinking water well to the site is the Nadeau Well 03; which is owned
and operated by the Golden State Water Company (GSWC) and is located approximately 0.42 mile
northwest of the site. This well has exhibited PCE and TCE concentrations up to 1.4 |ig/L
(August 2002) and 7.6 |ig/L (September 2020), respectively. The federal MCL for both PCE and
TCE is 5.0 |ig/L (RWQCB, 2023a; WESTON, 2023).

There are 70 known active drinking water wells and four known maintained-standby wells located
within the target distance limit (TDL) (i.e., 4 miles of established on-site sources). Water purveyors
known to operate wells within the TDL include GSWC - Florence/Graham, City of South Gate,
City of Huntington Park, Walnut Park Mutual Water Company (MWC), GSWC - Bell, Bell
Gardens, Los Angeles Department of Water and Power (DWP), City of Lynwood, Tract 349
MWC, Park Water Company (Liberty) - Lynwood, Park Water Company (Liberty) - Compton,
City of Compton, GSWC - Willowbrook, Lynwood Park MWC, Maywood MWC No. 1,
Maywood MWC No. 2, Maywood MWC No. 3, GSWC - Southwest, Tract 180 MWC, City of
Vernon, and Sativa-LA County Water District (CWD). Additional service information for these
purveyors is presented in Table 16 (WESTON, 2023).

4.2.3	Groundwater Pathway Conclusion

A release of hazardous substances from the site to groundwater within the Gaspur aquifer, or
additional aquifers underlying the Gaspur aquifer, has not been established based on the results of
the SI investigation. For HRS purposes, a release to groundwater is established when a hazardous
substance is detected in a hydraulically downgradient well at a concentration significantly above
background levels, and some portion of the release is attributable to the site. A hazardous substance

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is considered to be present at a concentration significantly above background levels when one of
the following two criteria is met: (1) the hazardous substance is detected in the contaminated
sample but not detected in the background samples, or (2) the hazardous substance is detected in
the contaminated sample at a concentration equal to or greater than three times the maximum
background level when the substance was detected in the background samples.

Results from the 2019 Stage 1 and Stage 2 SI investigations identified detectable concentrations
of metals and VOCs within the Gaspur aquifer groundwater beneath the site (see Section 3.2.3).
However, because the hydraulic gradient of this aquifer beneath the site has not been adequately
defined, background concentrations could not be established and a release attributable to the site
could not be established (see Section 3.2.1).

The geologic materials between the ground surface at the site and the top of the deepest identified
aquifer, the Sunnyside, are generally characterized by confined aquifer systems, which are
composed of relatively permeable sands through gravels and are separated by relatively
impermeable clay through silt layers; although semipermeable zones within these layers allow one
or more aquifers to be interconnected in some areas. Aquifer interconnection within 2 miles of the
site has been documented between the Gaspur and Exposition aquifers. Aquifer interconnections
within 2 miles of the site have not been established between the Exposition and Gage, the Gage
and Hollydale, the Hollydale and Lynwood, the Lynwood and Silverado, and the Silverado and
Sunnyside. There are 70 known active drinking water wells and four known standby drinking water
wells within 4 miles of the site. These wells, which are operated by 20 distinct water purveyors,
serve an apportioned population of approximately 390,000 (DWR, 1961; WESTON, 2017;
WESTON, 2023).

4.3 Soil Exposure and Subsurface Intrusion Pathway
4.3.1 Soil Exposure

In determining the score for soil exposure, the HRS evaluates the following: (1) the likelihood that
there is surficial contamination associated with the site (e.g., contaminated soil that is not covered
by pavement or at least 2 feet of clean soil); (2) the characteristics of the hazardous substances in
the surficial contamination (i.e., toxicity and quantity); and (3) the people or sensitive
environments (targets) that actually have been, or potentially could be, exposed to the
contamination. For the targets component of the evaluation, the HRS focuses on populations that
are regularly and currently present on or within 200 feet of surficial contamination. The four
populations that receive the most weight are residents, students, daycare attendees, and terrestrial
sensitive environments.

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4.3.1.1	Physical Conditions

The Central Metal site has been used for industrial operations since at least the late 1920s and is
surrounded by industrial, commercial, and residential areas. During scrap metal operations, which
occurred from approximately the late 1980s through 2016, various scrap metal and debris were
stored across the exterior portions of the site in large, uncontained, and uncovered piles. A debris
pile located on the north-central portion of the site in 2005 is estimated to have covered more than
23,000 ft2 and been several stories in height. In 2018, under the direction of the local CUP A, an
on-site debris pile was containerized, sampled, and subsequently classified as a hazardous waste
based on identified concentrations of arsenic, lead, and cadmium. Moreover, a 2011 DTSC
investigation also identified high levels of hazardous heavy metals in debris piles on the site. The
site is entirely fenced and generally inaccessible to the public. The surface of the site is entirely
covered in concrete or buildings (Attachment 2; Brash, 2019; DTSC, 2011; Google, 2023;
WEECO, 2014; WESTON, 2017).

4.3.1.2	Soil Exposure Targets

The site is situated between two residential communities, the southwestern portion of Walnut Park
to the east and the east-central portion of Florence-Firestone (also known as Florence-Graham) to
the west. These communities are both composed of primarily single-family residential buildings
situated on parcels that are typically less than 0.25 acre in size. Several multi-family and/or
apartment complexes are also intermixed within the neighborhoods. The population within 1 mile
of the site is estimated to be approximately 58,000. The number of workers that regularly occupy
the site is unknown. There are no residents or sensitive environments on site (Appendix C;
Google, 2023; EPA, 2023c).

Based on historical data within the basin, the local wind patterns at the site are estimated to
resemble those at the Hawthorne Municipal Airport wind station, which is located approximately
6.5 miles west-southwest of the site. Based on mean wind speed data, the predominant wind flow
direction is from the west-southwest and the secondary wind flow direction is from the
east-southeast (WRCC, 2020).

4.3.1.3	Soil Exposure Conclusion

During the 2022 Stage 3 SI investigation, which included collecting shallow soil samples from 63
properties in the Walnut Park neighborhood and from 20 properties in the Florence-Firestone
neighborhood, significantly elevated concentrations of metals, including lead and arsenic, were
identified on a minority of the sampled properties (see Section 3.2.4). However, the relatively low
frequency of HRS screening benchmark exceedances, as well as the lack of any apparent pattern
in the spatial distribution of these exceedances, suggests that the identified metals contamination
on the sampled residential properties is unlikely to be attributable to historical operations at the
Central Metal site. As such, a release of hazardous substances from the site to off-site residential
soils has not been established based on the results of the SI investigation.

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4.3.2 Subsurface Intrusion

In determining the score for subsurface intrusion, the HRS evaluates the following: (1) the
likelihood that sources at a site actually have released, or potentially could release, hazardous
substances to regularly occupied structures; (2) the characteristics of the hazardous substances that
are available for a release (i.e., toxicity, degradation, and quantity); and (3) the people (targets)
who actually have been, or potentially could be, exposed to the contamination. For the targets
component of the evaluation, the HRS focuses on populations living, attending school or daycare,
or working in a regularly occupied structure with observed exposure or within an area of
subsurface contamination.

During the 2019 Stage 1 and Stage 2 SI investigations, detectable concentrations of metals and
VOCs were identified in the subsurface at the Central Metal site. Metals are not considered to
represent a subsurface intrusion hazard. During this investigation, PCE was identified in a 2 ft-bgs
soil matrix sample collected from the central portion of the Warehouse at a concentration of
2.2 |ig/kg. The soil vapor survey completed as part of the SI identified three analytes that exceeded
their respective Resident VISLs, with PCE being the most significant (see Section 3.2.2). The
maximum PCE concentrations of 2,530 |ig/m3 and 2,190 |ig/m3 were identified in the 6.5 ft-bgs
and 16 ft-bgs samples, respectively, which were collected from boring SV-14 at the central portion
of the Warehouse. PCE was not identified above its Resident VISL in any additional soil vapor
samples and was not identified at detectable concentrations in any additional soil matrix samples.
Furthermore, during the 2021 subsurface investigation completed by CMI, PCE was identified at
a maximum concentration of 1,340 |ig/m3 in on-site soil vapor and was not reported at detectable
concentration in soil matrix samples (see Section 3.1.1.6). The Resident and Commercial VISLs
for PCE are 360 |ig/m3 and 1,570 |ig/m3, respectively, and the residential RSL is 24,000 |ig/kg.

The Central Metal facility was 'shuttered' in 2016 and had regularly occupied workspaces until at
least 2019, primarily at the Main Office; however, the current status of these workspaces is not
known. Based on the relatively limited scale, both in overall concentration and spatial distribution,
of the subsurface PCE contamination identified in the 2019 EPA investigations and the 2021 CMI
investigation, this contamination is not considered to represent a significant subsurface intrusion
hazard to occupied off-site structures (Appendix C; Brash, 2019; WEI, 2021b).

4.4 Surface Water Pathway

To determine the score for the surface water pathway, the HRS evaluates the following: (1) the
likelihood that sources at a site actually have released, or potentially could release, hazardous
substances to surface water (e.g., streams, rivers, lakes, and oceans); (2) the characteristics of the
hazardous substances that are available for a release (i.e., toxicity, persistence, bioaccumulation
potential, and quantity); and (3) the people or sensitive environments (targets) that actually have
been, or potentially could be, impacted by the release. For the targets component of the evaluation,

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the HRS focuses on drinking water intakes, fisheries, and sensitive environments associated with
surface water bodies within 15 miles downstream of the site.

Surface water run-off from the Central Metal site is expected to flow from the paved surfaces at
the site into curbside municipal stormwater drains located along adjacent public roadways and
easements. The nearest surface water body to the site is Compton Creek, which is approximately
2.9 miles southwest. Compton Creek was channelized in concrete by the U.S. Army Corps of
Engineers in approximately 1939 as part of a larger flood-control effort for the region. The
Compton Creek watershed drains an area of approximately 42 square miles. The creek is channeled
from south Los Angeles (near S. Main Street and W. 107th Street) for approximately 8.5 miles to
the confluence of the creek with the Los Angeles River, approximately 5.5 miles north of where
the river empties into the Pacific Ocean at San Pedro Bay. Flows in the both the creek and river
are dominated by urban run-off There are no surface water intakes, fisheries, or sensitive
environments associated with Compton Creek or the Los Angeles River downstream of the site;
however, there is a potential for fisheries and/or recreational areas to exist within San Pedro Bay
(Appendix C; Google, 2023; UC, 2017).

4.5	Air Pathway

In determining the score for the air migration pathway, the HRS evaluates the following: (1) the
likelihood that sources at a site actually have released, or potentially could release, hazardous
substances to ambient outdoor air; (2) the characteristics of the hazardous substances that are
available for a release (i.e., toxicity, mobility, and quantity); and (3) the people or sensitive
environments (targets) who actually have been, or potentially could be, impacted by the release.
For the targets component of the evaluation, the HRS focuses on regularly occupied residences,
schools, and workplaces within 4 miles of the site. Transient populations, such as customers and
travelers passing through the area, are not counted.

No hazardous substances sources applicable to the air migration pathway were identified. As of
October 2022, the site was entirely fenced and generally inaccessible to the public. The entirety of
the surface of the site was covered in concrete or buildings. Furthermore, all known potential
hazardous substances sources relevant to the air pathway that were historically present at the site
(i.e., debris piles) have been removed (Appendix C).

4.6	Hazard Ranking System Summary

The primary objective of the Central Metal SI investigation was to document information to be
used in the HRS characterization process, including source areas and levels of contamination in
on-site soil, soil vapor, and groundwater, as well as on residential properties downwind of the site.

Based on the results of this investigation, a release of hazardous substances from the site to the
Gaspur aquifer, or to any aquifer underlying the Gaspur aquifer, has not been established.

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Additionally, a release of hazardous substances from the site to the surface soils of adjacent
residential neighborhoods via airborne processes has not been established.

The following HRS factors are considered to be most significant in regards to NPL consideration
for the groundwater pathway:

¦	Hazardous substance sources at the site have been documented, consisting of
subsurface soils contaminated during historical operations. Substances including
acetone, arsenic, cadmium, cobalt, copper, lead, silver, and zinc were present in site
soils at concentrations exceeding source action levels (i.e., significantly above
background).

¦	The hydraulic gradient of the shallow aquifer beneath the site has not been adequately
defined primarily due to the lack of an on-site, or sufficiently near-site, active
groundwater monitoring well network. As such, background concentrations cannot be
assigned, and hazardous substances identified in the groundwater beneath the site
cannot be documented as attributable to historical on-site operations.

¦	The geologic materials between the site surface and the top of the Silverado aquifer are
generally characterized by relatively permeable sands and gravels (aquifers) with
interbedded confining zones (aquitards) of less permeable clays and silts.

¦	The nearest drinking water well is located less than 1/2 mile from the site.

¦	Drinking water wells within 4 miles of the site serve an apportioned population of
approximately 390,000.

The following HRS factors are considered to be most significant in regards to NPL consideration
for the soil exposure pathway:

¦	Hazardous substance sources have been documented as historically existing on the site
including numerous debris piles that were present on site from approximately 2003
through 2018. Pile samples collected by state and local agencies in 2011 and 2018
indicated concentrations of arsenic, cadmium, lead, and zinc at concentrations
exceeding state hazardous waste benchmarks.

¦	Based on the lack of discernable or significant patterns within the shallow soil
residential data, specifically in terms of the frequency and spatial distribution of metals
contamination, insufficient evidence was found to indicate soil contamination was
attributable to historical on-site operations.

¦	The population within 1 mile of the site is estimated to be 58,000.

The following HRS factors are considered to have low significance in regards to NPL
consideration:

¦	No drinking water intakes are associated with surface water within 15 miles
downstream of the site. There is the potential, however, for fisheries and/or sensitive
environments associated with the Pacific Ocean to exist within this target distance limit.

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¦	There are no known schools, daycare centers, or sensitive environments on site.

¦	The site is fenced and generally inaccessible to the public.

¦	The surface of the site is covered with pavement or buildings.

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REFERENCES

5. REFERENCES

AMEC, 2014:

AwwaRF, 2006:

AMEC Environment and Infrastructure, Inc., Removal Action Summary
Report, Jack Engle & Company, 04 June 2014.

American Water Works Associated Research Foundation, Contaminant
Transport Through Aquitards: Technical Guidance for Aquitard
Assessment, 2006.

Brash, 2019:

DTSC, 2011:

DTSC, 2012:

Brash Industries; Stockpile Removal, Sampling Data and Analysis for
Central Metal, lnc\ 25 March 2019.

Department of Toxic Substances Control; Report on Investigation on
Central Metal, Inc.; 08 May 2011.

Department of Toxic Substances Control; letter addressed to Mr. Steve
Oh, Agent for Service, In the Matter of: Central Metal Inc. - Docket No.
2011-3488; 08 October 2012.

DTSC, 2016:

DTSC, 2023a:

Department of Toxic Substances Control; California Site Screening,
Damille Metals Svc; 15 August 2016.

Department of Toxic Substances Control; Hazardous Waste Tracking
System (HWTS), Search Results, Damille Metal SVC (CAL000061913),
Central Metal Inc. (CAL000286492) ;

http://www.envirostor.dtsc.ca.gov/public/search.asp: data extracted 20
June 2023.

DTSC, 2023b:

DTSC, 2023c:

DWR, 1961:

Department of Toxic Substances Control; California Land Reuse and
Revitalization Act Agreement (CLRRA), Docket No. HAS-FY22/23-116;
31 May 2023.

Department of Toxic Substances Control; Envirostor Database, Search
Results, Damille Metal SVC (60002329);

http://www.envirostor.dtsc.ca.gov/public/search.asp: data extracted 08
September 2023.

Department of Water Resources, State of California; Bulletin No. 104,
Planned Utilization of the Ground Water Basins of the Coastal Plain of
Los Angeles County, Appendix A, Ground Water Geology; June 1961.

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REFERENCES

DWR, 2004:

EPA, 2023a:

EPA, 2023b:

EPA, 2023c:

Google, 2023:

Department of Water Resources, State of California; California's
Groundwater Bulletin 118, Coastal Plain of Los Angeles Groundwater
Basin, Central Subbasin; 27 February 2004.

U.S. Environmental Protection Agency, Superfund Program; Superfund
Public User Database; LIST-008R Active Site Status Report, Region 9,
Pre-Remedial Action Types', https://www.epa. gov/superfund/superfund-
data-and-reports; 24 July 2023; p. 319.

U.S. Environmental Protection Agency; Envirofacts Warehouse,
RCRAInfo query results; 8201 Santa Fe;

https://www3.epa.gov/enviro/facts/rcrainfo/search.html: data extracted 08
September 2023.

U.S. Environmental Protection Agency; EJ Screen: Environmental Justice
Screening and Mapping Tool; Version 2.11 query results; 1 mile Ring
Centered at 33.962586,-118.230595, https://www.epa.gov/eiscreen; data
extracted 18 April 2023.

Google Earth; 33°57'47.31 "N 118°13 '52.07"W, 20 June 2023, 08May
2022, 11 February 2022, 24 September 2021, 31 December 2020, 04 July
2020, 08 June 2018, 14March 2018, 03 December 2017, 27March 2017,
18 October 2016, 02 February 2016, 23 March 2015, 23 April 2014, 16
April 2013, 27 August 2012, 07March 2011, 14 November 2009, 08
January 2008, 30 July 2007, 15March 2006, 08 January 2006, 19
January 2005, 21 February 2004, 30 November 2003, 08 March 2003, 30
May 1994; http://earth.google.com; data extracted 08 September 2023.

Johnson et al., 2011: Johnson, R.L., Clark, B.R., Landon, M.K., Kauffman, L.J., Eberts, S.M.,
Journal of the American Water Resources Association, Modeling the
Potential Impact of Seasonal and Inactive Multi-Aquifer Wells on
Contaminant Movement to Public Water-Supply Wells, June 2011.

JTT, 2012:

LAC A, 2023:

J. T. Thorpe Settlement Trust; J.T. Thorpe Land Based Site List, Ace
Foundry, 10 April 2012; p. 1.

County of Los Angeles, Department of the Assessor; Property
Information, Assessor's ID Nos. 6202-036-009, 6202-036-010, 6202-036-
011, 6202-036-012, 6202-036-013, 6202-037-004, 6202-037-006, 6202-
037-009, 6202-037-010, https://maps.assessor.lacountv.gov ; data
extracted 08 September 2023.

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REFERENCES

LACFD, 1995:

LACFD, 1999:

County of Los Angeles, Fire Department, Health Hazardous Materials
Division; Notice of Violation and Order to Comply, Damille Metal
Supply, Inc., 26 January 1995.

County of Los Angeles, Fire Department, Health Hazardous Materials
Division; Inspection Summary Report, Damille Metal Supply, Inc., 05
November 1999.

LACFD, 2002:

LACFD, 2005:

County of Los Angeles, Fire Department, Health Hazardous Materials
Division; Facility Information Report, Damille Metal Supply, Inc.', 25
February 2002.

County of Los Angeles, Fire Department, Health Hazardous Materials
Division; Facility Information Report, Damille Metal Supply, Inc.', 03
March 2005.

LACFD, 2009:

LACFD, 2014:

LADPW, 2004:

LADPW, 2005:

LADPW, 2008a:

LADPW, 2008b:

LADPW, 2016:

LAPL, 2023:

RWQCB, 2023a:

County of Los Angeles, Fire Department, Health Hazardous Materials
Division; Inspection Report, Central Metal, Inc.', 07 August 2009.

County of Los Angeles, Fire Department, Health Hazardous Materials
Division; Inspection Report, Central Metal, Inc., 26 August 2014.

County of Los Angeles, Department of Public Works; Inspector's Report,
Central Metals, Inc. , 26 August 2004.

County of Los Angeles, Department of Public Works; Notice of Non-
Compliance, Central Metals, 22 March 2005.

County of Los Angeles, Department of Public Works; Notice, Central
Metals, Inc., 16 September 2008.

County of Los Angeles, Department of Public Works; Notice of Violation
and Order to Comply, Central Metals, Inc., 05 December 2008.

County of Los Angeles, Department of Public Works; Stormwater
Certification of Inspection Central Metals, Inc. , 21 April 2016.

Los Angeles Public Library; Los Angeles Public Library Photo Collection,
Search Results, Marbrisa; https://calisphere.org/collections/26094: data
extracted 08 September 2023.

Regional Water Quality Control Board; Geotracker Database - Regulator
Access, DPH Public Supply Well Search Results; Golden State Water

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REFERENCES

RWQCB, 2023b:

Spitzzeri, 2019:

UC, 2017:

UCSB, 2023:

Company - Florence/Graham, Miramonte Well 01, Miramonte Well 02,
Miramonte Well 03, Nadeau Well 03; data extracted 08 September 2023.

Regional Water Quality Control Board; Geotracker Database, Search
Results, 8201 Santa Fe, Huntington Park;
http://geotracker.waterboards.ca.gov/search.asp: data extracted 08
September 2023.

Spitzzeri, Paul R.; The Homestead Blog; From Point A to Point B: The
Southern Pacific Railroad Links to Los Angeles; 05 September 2019.

University of California, Division of Agriculture and Natural Resources;
About the Compton Creek Watershed; http://ucanr.edu: data extracted 28
February 2017.

University of California at Santa Barbara; UCSB Library Frame Finder,
Flight C-300, 1927; Flight C-278, 1928; Flight C-2060, 1932; Flight
Watson-412A, 1934; Flight AXJ-27-54, 1938; Flight C-l1351, 1947;
Flight C-22555, 1956; Flight C-25019, 1965; Flight TG-7600, 1976;
Flight AMI-LA-83, 1983; Flight NAPP-1840, 1989; data extracted 13 June
2023.

WCAB, 1984:

WEECO, 2014:

California Department of Industrial Relations, Workers' Compensation
Appeals Board; Case No. 79LA447909, Notice and Request for Allowance
of Lien; 02 May 1984.

Western Environmental Engineers Co.; Phase I Environmental Site
Assessment, 8201 Santa Fe Avenue, Huntington Park, CA; 06 January
2014.

WEI, 2021a:

Waterstone Environmental, Inc.; Phase 1 Environmental Assessment
Report; 8201 Santa Fe Avenue, Huntington Park, CA 90255; 31 August
2021.

WEI, 2021b:

WESTON, 2017:

WESTON 2020:

Waterstone Environmental, Inc.; Report addressed to Mr. Jong Uk Byun,
Re: Results of Additional Phase II Investigation at 8201 Santa Fe Avenue,
Huntington Park, CA 90255; 23 November 2021.

Weston Solutions, Inc.; Preliminary Assessment Report, Damille Metal
Svc (EPA ID No.: CAN000903324); December 2017.

Weston Solutions, Inc.; Site Inspection, Interim Sampling Report, Central
Metal (EPA ID No.: CAN000903324); May 2020.

42


-------
Central Metal SI Report	September 2023

CAN000903324	REFERENCES

WESTON, 2023: Weston Solutions, Inc.; Drinking Water Wells - GIS Report, Central
Metal, Inc.; June 2023.

Note: This document is confidential and is included in the confidential information packet.

WRCC, 2020:	Western Regional Climate Center; WRCC Station Maps, Hawthorne Muni

AP California; data extracted 04 March 2020.

WRD, 2023:	Water Replenishment District of Southern California; Engineering Survey

and Report) 17 August 2023.

43


-------
Central Metal SI Report

CAN000903324

September 2023

TABLES

TABLES

T-i


-------
Central Metal SI Report

September 2023

CAN000903324	TABLES

Table 1: Site Chronology

Approximate
Date Range

Souree Area

Operator

Primary
Operations

1870s- 1970s

FRA

Southern Pacific Railroad

Railroad depot and freight operations

1920s - 1980s

FTMA

National Tank &
Manufacturing Co.

Corrugated metal lank manufacturing

1930s - 1970s

FTMA

Ace Foundry LTD

Metal casting

1970s-2002

FRA

Southern Pacific Railroad

No significant operations

1989-2002

FTMA

Damille Metal Supply,
Inc.

Industrial scrap metal recycling

1990s

FTMA

L&S Metals

U nknown

1990s

FTMA

MCS, Inc.

Unknown

1990s

FTMA

All Star Metals. Inc.

U nknown

2002-2016

FRA & FTMA

Central Metal, Inc.

Industrial scrap metal recycling

2016-2018

FRA & FTMA

Central Metal. Inc.
(defunct)

No significant operations

2018-2020

FRA & FTMA

Central Metal, Inc.
(defunct)

Facility cleanup and asset liquidation

2020-2022

FRA & FTMA

U nknown

Cargo Shipping Container Storage

2022 - Present

FRA & FTMA

U-Haul®

Bulk Storage

Definitions:

FRA = Former Railroad Area

FTMA = Former Tank Manufacturing Area

References:

Brash, 2019; DTSC, 2016; DTSC, 2023b; Google, 2023; JTT. 2012; LACFD, 1999; LACFD, 2002; WCAB, 1984; WEECO, 2014

T-1 (1 of 1)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Table 2: 2021 CMI Phase II Sampling Results Summary

Sample
Location

Depth
(ft)

Soil Matrix (mg/kg)

Soil Vapor (|jg/m3)

Arsenic

Cd

Cobalt

Lead

Zinc



PCE

Residential RSL

0.68

7.1

23

400

23,000

Resident VISL

360

Commercial RSL

3

100

350

800

350,000

Commercial VISL

1,570

P-1

0.5

28

29

47

3,600

20,000



-

SV-21

2

12

<0.52

17

130

320

—

5

6.5

1.4

7.0

180

240

1,340

15

—

—

—

—

—

1,290

SV-22

2

45

<0.48

11

140

230

—

5

4.4

0.62

9.3

8.5

66

115

15

—

—

—

—

—

14

SV-23

2

2.9

<0.52

9.2

10

70

—

5

—

—

—

—

—

573

15

—

—

—

—

—

48

SV-24

2

1.2

<0.51

5.9

2.4

34

—

5

—

—

—

—

—

369

15

—

—

—

—

—

42

SV-25

2

34

<0.49

9.9

120

170

—

5

—

—

—

—

—

456

15

—

—

—

—

—

90

SV-26

2

13

<0.50

11

15

71

—

5

—

—

—

—

—

643

15

—

—

—

—

—

162

SV-27

2

31

1.2

12

190

290

—

5

3.0

0.48

7.4

4.1

51

10

15

—

—

—

—

—

18

SV-28

2

78

<0.47

8.0

51

100

—

5

—

—

—

—

—

60

15

-

-

-

-

-

52

SV-29

2

3.0

<0.46

7.2

4.7

45

-

5

-

-

-

-

-

143

15

-

-

-

-

-

114

SV-30

2

23

<0.53

9.8

120

640

-

5

-

-

-

-

-

189

15

-

-

-

-

-

171

SV-31

2

7.8

1.0

14

100

310

-

5

-

-

-

-

-

199

15

-

-

-

-

-

54

SV-32

2

5.8

<0.46

12

35

120

-

5

-

-

-

-

-

965

15

-

-

-

-

-

181

SV-33

2

2.7

0.94

13

6.8

400

-

5

-

-

-

-

-

16

15

-

-

-

-

-

41

SV-34

2

5.3

<0.49

8.4

13

58

-

5

-

-

-

-

-

125

15

-

—

—

—

-

74

Definitions:

Cd = Cadmium
ft = feet

mg/kg = milligram per kilogram
PCE = Tetrachloroethylene

RSL = EPA Regional Screening Level (May 2023; THQ =1.0, Risk = 10-6)

VISL = EPA Vapor Intrusion Screening Level (Nov 2019; Target Sub-Slab; THQ =1.0, Risk = 10-6)

<## = Analyte not detected at or above indicated Sample Quantitation Limit (SQL)

References:
WEI, 2021b

T-2 (1 of 1)


-------
Central Metal SI Report

September 2023

CAN000903324	TABLES

Table 3: 2011 DTSC Debris Pile Sampling Results Summary

Sample
Number

Sample Deseription

Contaminant(s)

Result *

Regulatory
Limit

CM-01

Sample of sludge on the concrete
just inside the facility

Lead (STLC)

Diesel and oily wastes,
PCBs present

26 mg/L

5.0 mg/L

CM-02 *

Liquid Sample taken from puddle
of liquid outside of the facility

No hazardous waste levels of
contaminants found.

Oily wastes present





CM-03

Sample from the sludge settled on
the side of the drainage canal.

Lead (STLC)

Oily wastes, ORO,
presence of PCBs

17 mg/L

5.0 mg/L

CM-04

Sediment sample from the bottom
of the drain channel

Lead (STLC)

Diesel and oily wastes.
PCBs present

15 mg/L
8,100 mg/kg
20,000 mg/kg

5.0 mg/L

CM-05

West Pile:

Sample of contaminated soils

Lead (STLC)
Zinc (STLC)
Lead (TTLC)
Zinc (TTLC)

26 mg/L
790 mg/L
2,200 mg/kg
11,000 mg/kg

5.0 mg/L
250 mg/L
1,000 mg/kg
5,000 mg/kg

CM-06

West Pile:

Sample of contaminated soils

Lead (STLC)
Zinc (STLC)
Lead (TTLC)
Zinc (TTLC)

67 mg/L
320 mg/L
2,000 mg/kg
9,300 mg/kg

5.0 mg/L
250 mg/L
1,000 mg/kg
5.000 mg/kg

CM-07

West Pile:

Sample of contaminated soils

Lead (STLC)
Zinc (STLC)
Lead (TTLC)
Zinc (TTLC)

46 mg/L
540 mg/L
2,100 mg/kg
12,000 mg/kg

5.0 mg/L
250 mg/L
1,000 mg/kg
5,000 mg/kg

CM-08

West Pile:

Sample of contaminated soils

Lead (STLC)
Zinc (STLC)
Lead (TTLC)
Zinc (TTLC)

54 mg/L
1,100 mg/L
2,400 mg/kg
15,000 mg/kg

5.0 mg/L
250 mg/L
1,000 mg/kg
5.000 mg/kg

CM-09

West Pile:

Sample of contaminated soils

Lead (STLC)
Zinc (STLC)
Lead (TTLC)
Zinc (TTLC)

75 mg/L
690 mg/L
2,100 mg/kg
13,000 mg/kg

5.0 mg/L
250 mg/L
1,000 mg/kg
5,000 mg/kg

CM-10

West Pile: Northwest face.
Sample of contaminated soils

Lead (STLC)

Zinc (STLC)

Lead (TTLC)

Zinc (TTLC)

Oily wastes. ORO.
presence of PCBs

81 mg/L
390 mg/L
1,700 mg/kg
8,800 mg/kg

5.0 mg/L
250 mg/L
1,000 mg/kg
5.000 mg/kg

CM-11

West Pile: Northwest face. Oily
contaminated soils

Lead (STLC)

Zinc (STLC)

Lead (TTLC)

Zinc (TTLC)
Cadmium (STLC)
Oily wastes, ORO,
presence of PCBs

42 mg/L
320 mg/L
1,600 mg/kg

8.000	mg/kg

2.1	mg/L

5.0 mg/L
250 mg/L
1,000 mg/kg
5,000 mg/kg
1.0 mg/L

Definitions:

mg/kg = milligrams per kilogram

mg/L = milligrams per liter

ORO = oil range organics

PCB = polychlorinated biphenyl

STLC = soluble threshold limit concentration

TCLP = toxicity characteristic leaching procedure

TTLC = total threshold limit concentration

Notes:

Sample portions were all <100 micrograms unless denoted as liquids.
* = numbers in bold exceed the regulatory limits (STLC) or (TCLP)
** = Liquid sample

Reference:
DTSC, 2011

T-3 (1 of 2)


-------
Central Metal SI Report

September 2023

CAN000903324	TABLES

Sample
Number

Sample Deseription

Contaminant(s)

Result *

Regulatory
Limit

CM-12

East Pile of contaminated soils

Lead (STLC)

Zinc (STLC)

Lead (TTLC)

Zinc (TTLC)

Oily wastes. ORO.
presence of PCBs

63 mg/L
550 mg/L
2,700 mg/kg
10,000 mg/kg

5.0 mg/L
250 mg/L
1.000 mg/kg
5.000 mg/kg

CM-13

East Pile of contaminated soils

Lead (STLC)

Zinc (STLC)
Lead (TTLC)
Zinc (TTLC)
presence of PCBs

63 mg/L
550 mg/L
2,700 mg/kg
10,000 mg/kg

5.0 mg/L
250 mg/L
1,000 mg/kg
5,000 mg/kg

CM-14

East Pile of contaminated soils

Lead (STLC)

Zinc (STLC)

Lead (TTLC)
Zinc (TTLC)
presence of PCBs

68 mg/L
780 mg/L
2,300 mg/kg
9,500 mg/kg

5.0 mg/L
250 mg/L
1.000 mg/kg
5.000 mg/kg

CM-15

East Pile of contaminated soils

Lead (STLC)

Zinc (STLC)
Lead (TTLC)
Zinc (TTLC)
presence of PCBs

95 mg/L
720 mg/L
2,800 mg/kg
11,000 mg/kg

5.0 mg/L
250 mg/L
1,000 mg/kg
5,000 mg/kg

CM-16

Sample from the puddle at llic
base of the electronic waste pile

Lead (STLC)
Mercury (cold vapor)

41 mg/L
0.74 mg/L

5.0 mg/L
0.2 mg/L

Definitions:

mg/kg = milligrams per kilogram

mg/L = milligrams per liter

ORO = oil range organics

PCB = polychlorinated biphenyl

STLC = soluble threshold limit concentration

TCLP = toxicity characteristic leaching procedure

TTLC = total threshold limit concentration

Notes:

Sample portions were all <100 micrograms unless denoted as liquids.
* = numbers in bold exceed the regulatory limits (STLC) or (TCLP)
** = Liquid sample

Reference:
DTSC, 2011

T-3 {2 of 2)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Table 4: 2018 CUPA Debris Pile Sampling Results Summary

Roll Away Bin
No.

Sample (Pail)
No.

Antimony

Arsenic

Barium

Beryllium

Cadmium

Chromium

Cobalt

Copper

Lead

Mercury

Molybdenum

Nickel

Selenium

Silver

Thallium

Vanadium

Zinc

Residential RSL

31

0.68

15,000

160

7.1

„<1>

23

3,100

400

11

390

1,500

390

390

0.78

390

23,000

Industrial RSL

470

3.0

220,000

2,300

100



350

47,000

800

46

5,800

22,000

5,800

5,800

12

5,800

350,000

Max Result

150

1,300

580

90

130

1,100

100

14,000

3,200

10

130

1,400

--

82

17

58

16,000

1

1-4

78



580



53

370

28

800

1.600



48

330



15



43

12,000

1-6

100



470



69

1,000

31

2,700

2.200



65

690



18



46

13,000

1-7

100

280

480



33

370

23

1,300

1.500

3.4

48

380



33

5.4

24

11,000

1-8

82

390

460

1.2

35

370

44

1,000

1.500

3.6

29

390



34

4.4

23

11,000

2

2-1

100

300

440

<0,80

39

580

24

1,500

1.900

2.7

49

520

<2,8

32

3.3

28

13,000

2-4

110

260

500

<0,80

76

530

30

1,900

1.400

3.2

53

370

<2,8

37

<2,5

30

10,000

2-6

120

240

440

<0,80

97

520

29

14,000

2.400

4.1

32

440

<2,8

33

2.6

28

11,000

2-9

43

<2.5

420

<0,80

53

290

25

1,100

1.100

<0,01

48

330

<2,8

16

<2,5

42

11,000

3

3-4

44



350



57

530

30

750

1.200



78

430



16



42

11,000

3-5

89

390

370



61

340

18

1,200

1.900

2.4

24

340



28

3.5

30

10,000

3-8

97

230

480



42

700

22

1,400

1.500

3.6

27

400



33

2.7

24

11,000

3-10

85

200

430



32

270

21

1,200

1.200

3.3

23

300



30



25

9,600

4

4-2

86

300

360

<0,80

47

460

22

940

1,100

2.1

47

370

<2,8

31

<2,5

24

11,000

4-5

67

<2.5

450

<0,80

72

990

43

1,200

1.400

3.9

63

710

<2,8

26

<2,5

45

11,000

4-6

42

<2.5

390

<0,80

72

360

27

1,300

1.400

2.4

54

330

<2,8

23

<2,5

42

10,000

4-7

50

<2.5

390

<0,80

72

630

30

870

1.200

<0,01

58

470

<2,8

16

<2,5

43

10,000

5

5-4

66



500



42

380

27

1,100

2.800

3.1

48

380



82



46

11,000

5-7

50



440



42

390

25

1,200

1.400



36

280



15



43

9,700

5-8

56



400



56

520

24

2,100

1.400



53

390



16



43

9,700

5-9

72

200

450



36

340

39

900

1.100

1.9

20

220



27



28

7,500

6

6-1

87

160

170

<0,80

31

230

21

550

610

2.1

39

170

<2,8

12

<2,5

28

7,100

6-3

52

<2.5

470

<0,80

48

320

40

990

1.400

<0,01

34

320

<2,8

68

<2,5

40

13,000

6-4

55

<2.5

420

<0,80

47

330

41

3,000

1.700

<0,01

45

380

<2,8

17

<2,5

46

11,000

6-10

86

220

370

<0,80

54

350

20

780

1.400

3.2

26

290

<2,8

32

<2,5

33

11,000

7

7-1

71

200

340



28

260

27

680

1.400

4.8

19

240



28



25

9,000

7-6

66

150

320



24

260

19

750

1.300

3

21

240



22



24

7,400

7-7

83

160

240



24

350

19

670

870

2.8

45

270



18



23

6,700

7-10

100

350

320



54

360

28

960

1.100

7.2

28

320



31



29

11,000

T-4 (1 of 3)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Roll Away Bin
No.

Sample (Pail)
No.

Antimony

Arsenic

Barium

Beryllium

Cadmium

Chromium

Cobalt

Copper

Lead

Mercury

Molybdenum

Nickel

Selenium

Silver

Thallium

Vanadium

Zinc

Residential RSL

31

0.68

15,000

160

7.1

„<1>

23

3,100

400

11

390

1,500

390

390

0.78

390

23,000

Industrial RSL

470

3.0

220,000

2,300

100



350

47,000

800

46

5,800

22,000

5,800

5,800

12

5,800

350,000

Max Result

150

1,300

580

90

130

1,100

100

14,000

3,200

10

130

1,400

-

82

17

58

16,000



8-1

110

230

270

<0,80

35

330

29

1,400

2.400

2.2

37

320

<2,8

34

7.2

20

9,900

8

8-5

94

200

280

<0,80

32

290

30

750

930

3.4

42

270

<2,8

15

6.5

30

8,100

8-6

47

<2.5

430

<0,80

38

450

34

870

1.100

2.8

60

550

<2,8

21

<2,5

46

11,000



8-8

90

190

220

<0,80

52

300

20

1,100

1.100

3.4

44

290

<2,8

33

6.3

36

7,300



9-2

45



310



41

370

25

1,400

1.800

2.5

59

340



22



47

11,000

9

9-3

90

260

330



28

210

20

1,600

760

3

27

240



17

5.7

21

6,900

9-9

120

230

210



48

310

14

470

1.100

2.5

33

260



15

8.4

28

5,100



9-10

75

220

270



34

270

26

890

1.600

3

130

670



30

4.4

19

6,900



10-3

100

190

290

<0,80

32

240

21

1,200

1.100

3

23

230

<2,8

16

5.8

24

8,300

10

10-4

73

160

170

<0,80

19

200

18

470

410

3.3

13

180

<2,8

11

3.2

23

6,300

10-8

58

<2.5

300

<0,80

25

370

31

630

1.000

<0,01

27

270



34



43

8,000



10-10

56

<2.5

310

<0,80

38

430

36

1,100

1.100

4.5

50

430



22



46

9,000



11-2

120

180

260



33

460

64

1,200

1.600

9.9

34

510



13

3.7

22

7,400

11

11-5

60



390



49

540

34

2,100

1.400

4.4

65

440



25



42

11,000

11-8

64



330



64

540

45

1,300

2.100



53

520



17



44

11,000



11-9

110

240

350



77

420

38

2,100

1.400

5.9

47

440



35

4.8

22

11,000



12-1

59

<2.5

350

<0,80

57

420

34

1,100

1.700

5.4

62

380

<2,8

25

<2,5

43

11,000

12

12-5

90

<2.5

360

<0,80

69

710

60

1,800

1.800

10

86

660

<2,8

30

<2,5

40

11,000

12-6

79

<2.5

450

<0,80

57

580

53

1,700

2.300

9.4

87

630

<2,8

30

<2,5

44

12,000



12-10

73

<2.5

410

<0,80

42

530

53

1,000

1.700

<0,01

63

580

<2,8

21

<2,5

42

9,900



13-1

81



410



46

430

58

1,100

3.000



61

540



21



40

10,000

13

13-2

91



380

4.2

57

360

46

1,800

3.200



53

400



19



39

11,000

13-3

89

170

250

3.5

36

280

81

1,400

1.200

9.9

41

330



15



20

7,300



13-5

99

180

260



55

310

28

1,400

1.600

7.2

42

280



16

4.6

22

7,200



14-2

100

230

290

<0,80

27

630

31

5,100

1.600

7.5

36

430

<2,8

19

4.8

19

7,400

14

14-6

90

<2.5

430

<0,80

45

540

43

1,600

2.300

7.9

93

490

<2,8

27

<2,5

44

11,000

14-9

62

<2.5

380

<0,80

42

530

94

2,400

1.200

<0,01

89

520

<2,8

22

<2,5

45

11,000



14-4

70

<2.5

290

1.7

38

570

37

1,200

1.200

<0,01

59

480

<2,8

22

<2,5

46

11,000



15-2

100

260

330

12

39

450

49

2,900

1.300

5.1

45

440



37

3.1

22

11,000

15

15-5

86

160

250



21

280

28

650

2.500

8.5

30

300



13

2.9

20

6,300

15-6

48



180



40

390

43

1,300

1.200

5.8

66

380



23



39

11,000



15-7

84



290



51

430

26

1,300

2.600

4.9

60

700



24



43

11,000

T-4 (2 of 3)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Roll Away Bin
No.

Sample (Pail)
No.

Antimony

Arsenic

Barium

Beryllium

Cadmium

Chromium

Cobalt

Copper

Lead

Mercury

Molybdenum

Nickel

Selenium

Silver

Thallium

Vanadium

Zinc

Residential RSL

31

0.68

15,000

160

7.1

„<1>

23

3,100

400

11

390

1,500

390

390

0.78

390

23,000

Industrial RSL

470

3.0

220,000

2,300

100



350

47,000

800

46

5,800

22,000

5,800

5,800

12

5,800

350,000

Max Result

150

1,300

580

90

130

1,100

100

14,000

3,200

10

130

1,400

--

82

17

58

16,000

16

16-1

92

190

240

<0,80

29

400

25

760

870

6.4

47

310

<2,8

14

<2,5

17

6,400

16-5

70

<2.5

360

<0,80

55

430

40

1,300

1.500

6.2

78

420

<2,8

24

<2,5

43

12,000

16-7

80

<2.5

500

<0,80

48

470

38

1,100

1.500

7.4

80

430

<2,8

24

<2,5

53

11,000

16-9

110

210

290



29

310

29

1,500

1.100

6.3

50

300



16

5.2

22

7,500

17

17-1

82



430

2.9

62

660

54

2,800

1.900

8.3

110

1,400



27

2.9

42

13,000

17-4

120

190

290



26

330

39

1,500

2.000

9

40

340



15

3.5

23

9,100

17-5

100



470



40

550

55

1,900

2.300

7.4

80

550



24



42

13,000

17-6

90



450



41

470

53

4,300

2.300

7.2

94

620



27



49

16,000

18

18-3

110

<2.5

500

90

34

1,100

100

6,600

1.400

<0,01

62

440

<2,8

19

<2,5

39

11,000

18-5

110

<2.5

460

<0,80

120

560

61

2,300

2.900

6.8

110

850

<2,8

25

<2,5

45

13,000

18-7

79

<2.5

550

<0,80

47

730

79

2,100

2.000

5.2

110

550

<2,8

27

<2,5

58

12,000

18-9

78

<2.5

330

<0,80

36

650

50

1,400

1.400

<0,01

49

700

<2,8

17

<2,5

38

10,000

19

19-3

120

1.100

370



36

640

55

1,000

1.600

5.9

80

450



40

5.3

24

10,000

19-4

110

260

390



41

450

45

1,200

1.500

6.7

69

530



37

4.6

21

11,000

19-5

120

180

240



36

560

29

1,500

2.300

6.8

46

430



22

3.3

18

7,300

19-18

110

250

400



130

570

54

960

1.400

6.9

50

510



37

4.2

21

11,000

20

20-1

110

230

410

<0,80

31

860

32

2,700

1.000

3.7

92

660

<2,8

31

3.4

15

9,100

20-2

77

210

290

<0,80

28

260

22

730

1.300

3.7

28

230

<2,8

28

2.9

19

8,600

20-5

94

230

360

<0,80

33

420

45

2,100

1.700

5.5

43

360

<2,8

34

6

18

8,900

20-8

150

320

440

<0,80

61

360

33

3,300

1.500

5.0

70

490

<2,8

27

XL

34

11,000

21

21-4

98

230

310



25

740

47

3,000

1.500

4.0

54

590



34

4.5

15

7,400

21-5

96

170

310



23

270

27

590

800

4.4

30

250



17



20

6,900

21-6

110

1.300

450



18

180

12

700

910

2.4

34

180



19

11

20

4,100

21-7

100

200

370



30

340

20

1,600

1.800

3.7

34

330



34



18

8,200

^otes:

All units are In milligrams per kilogram (mg/kg)

Values in Bold exceed residential Regional Screening Level (RSL) (May 2023; THQ =1.0, Risk = 10-6)
Values in Bold and Underlined exceed industrial RSI CMav ?0?3- THO =1 0 Risk = 10-fil
1 = an RSL for Total (i.e., unspeciated) chromium has not been established.

Reference:
Brash, 2019

T-4 (3 of 3)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Table 5: Soil Vapor Survey Results - Select VOCs

Sample
Location

Sample
Depth
(ft-bgs)

Analyte (Mg/mJ)

1,1,1 -T richloroethane

1,2,4-Tri methyl be n ze n e

4-lsopropyltoluene

Bromodichloromethane

Bromoform

Carbon Tetrachloride

Dibromomethane

Dichlorodifluoromethane

Ethylbenzene

Freon 113

m,p-Xylene

Methylene chloride

o-Xylene

Tetrachloroethylene

Toluene

Trichlorofluoromethane

Resident VISL

174,000

2,090

--

2.5

85

16

139

3,480

37

174,000

3,480

3,380

3,480

360

174,000

--

Commercial VISL

730,000

8,760

-

11

372

68

584

14,600

164

730,000

14,600

40,900

14,600

1,570

730,000

-

SV-1

5.5



, -



, -



, -



375



45



, -

,

36

11

390

16















467



45







32



356

SV-2

6.5



15

79









371

8.0

28

36



12

84

12

181

16





23









631



58







166



359

SV-3

6.0



' '

22

' 1



' 1



180

11

33

50



16

62



106

16



' '

23

' 1



' 1



200



34



' 1

' .

55



105

SV-4

6.0





29









111



23







169



94

16



21

121









109



20

24



10

132



83

SV-5

6.0



' '



' 1



' 1



165



24



' '

' '

38



141

16



' '



' 1



' '



243



30



' '

' '

45



170

SV-6 <1)

--

--

--

--

--

--

--

--

--

-

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

-

--

--

--

--

--

--

--

SV-7

6.0



' '



' 1



' '



137



35



' '

' '

41



165

15.5



' '



' '



' '



157



35



' '

' '

59



168

SV-8

6.0















81 / 97



20/23







151 /184



104/127

16

ND

ND

ND

ND

ND

ND

ND

115

ND

29

ND

ND

ND

161

17

148

SV-9

5.5

22

' '



' '



' '

' '

86

' '



' '



' '

19



128

15.5

25

' '



' '



' '

' '

99

' '

19

' '



' '

22

14

157

SV-10

6.0











18



40



21







162



262

15.5











12



56



27







28

20

314

SV-11

5.5





26





















101

13

236

16



t '

15

t '



9.0



53

t '

33

t '



t '

339

11

424

SV-12

6.5

26













60



101







57

9.0

1,310

14.5

35













76



109







103



1,380

SV-13 (1)

3.0



























137



222

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

SV-14

6.5

18

















26







2,530



468

16

24













25



37







2,190

12

682

SV-15

6

73









13







22







60

11

404

15.5

99

t '



t '





t '



t '

31

t '



t '

113



511

SV-16

6.0



















19







68



332

15.5

44/43









80/







20/24







74/72



388 / 403

SV-17

6.0



























28



77

16



t '



t '



t '



t '

t '

t , 1

t '

t , 1

t '

52

t , 1

97

SV-18

6.0

ND

ND

9.0

ND

ND

ND

ND

ND

ND

ND

ND

ND

ND

147

ND

37

16





20





















156



39

SV-19

6.0

































16



























8.0





SV-20

6.0

ND

10

34

13

16

ND

13

52

ND

1,920

20

12

ND

22

14

26

15.5

ND

ND

ND

ND

ND

ND

ND

60

ND

2,240

ND

ND

ND

35

10

17

Notes

All values are reported in |jg/m3

Bold and Underlined values indicate results that exceed Resident VISL
Samples collected in April 2019

All other reported analytes did not exceed analytical reporting limits
1 = no value indicates that a probe was not installed due to early refusal

Definitions
ft-bgs = feet below ground surface
ND = Analyte did not exceed analytical reporting limit

VISL = EPA Vapor Intrusion Screening Level (May 2023, Target Sub-Slab, THQ =1 0. Risk = 10"6)
Mg/m3 = micrograms per cubic meter

T-5 (1 of 1)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Table 6: Stage 1 Soil Sampling Results - Select Metals

Sample
Location

Sample Depth
(ft)

Analyte

Arsenic
(As)

Cadmium
(Cd)

Cobalt
(Co)

Lead
(Pb)

Zinc
(Zn)

Source Action Level(1)

14

0.66

69

41

450

Residential RSL

0.68

7.1

23

400

23,000

Industrial RSL

3.0

100

350

800

350,000

SV-1

2

3.3

0.22J

17

8.0

103J

10

0.83

<0.45

5.2

1.6

41J

SV-2

2

2.7

0.18J

13

14

108J

10

0.89

<0.49

4.1

1.5

25J

SV3

2

2.5

0.13J

12

7.5

74J

10

0.97

0.093J

4.6

1.3

20J

SV4

2

2.6

0.16J

13

5.5

81J

10

1.0

<0.45

4.2

1.4

26J

SV-5

2

3.1

0.25J

21

7.1

92J

10

0.76



3.2

1.3

21J

SV-6(2)

2

8.3

2.5

61

338

490 J

SV-7

2

2.3

0.22J

6.4

27

41J

10

1.1



4.9

6.5

31J

SV-8

2

3.2/2.3

0.20J/0.14J

14/13J

31 /11J+

91J/ 80J+

10

2.9

<0.47

3.5J

1.8

19

SV-9

2

7.9J

1.3 J

91

170

190

10

1.3



4.6J

1.7

25

SV-10

2

2.7J

<0.56

11

4.5

62

10

1.6

<0.51

5.2

1.8

27

SV-11

2

3.6J/2.7

<0.56/0.13J

13/13J

13 /13J+

84 / 85J+

10

0.93J

<0,50

4.1J

1.2

20

SV-12

2

22 J

<0.00

38J

33J

65J

10

2.6J

<0.54

9.9

3.6

58

SV-13(2)

2

16 J



10

12

86

SV-14

2

2.2/2.3

0.11J/ 0.12J

9.7J/11J

4 0J+/4.6J+

58J+/ 64J+

10

0.75

<0.51

2.8J

1.0J+

18J+

SV-15

2

3.8

0.25J

17J

6.1J+

90J+

10

1.3



4.2J

1.5J+

26J+

SV-16

2

2.6

0.12J

13J

4.3J+

76J+

10

0.64

<0,44

3.3J

1.3J+

21J+

SV-17

2

5.5/5.0

1.4/1.4

13J/13J

301 J+/199 J+

778 J+/ 464 J+

10

0.96



4.2J

2.0J+

28J+

SV-18

2

3.0

0.63

8.9J

170 J+

367J+

10

1.2

<0.48

5.1J

2.2J+

31J+

SV-19

2

5.4

1.1

16J

90 J+

612 J+

10

0.74



4.9J

2.0J+

33J+

SV-20

2

2.0

0.13J

9.8J

6.3J+

65J+

10

1.2

<0.48

3.9J

1.4J+

23J+

Notes:

All values are reported in mg/kg

Bold & Underlined values indicate results that exceed Source Action Level
Samples collected in April 2019

1 = Per the HRS, the action level to establish an on-site source of contaminated soil is 'significantly above background" (see Section 3.2.1).

Source Action Levels:

Antimony = 7.9 Lead = 41
Arsenic = 14 Manganese = 2,240
Barium = 861 Nickel = 83
Beryllium = 1.3 Selenium = 4.6
Cadmium = 0.66 Silver = 1.3
Chromium = 130 Thallium = 3.3
Cobalt = 69 Vanadium = 263
Copper = 111 Zinc = 450

Definitions:

J = The result is an estimated quantity

J+ = The result is an estimated quantity, but the result may be biased high
J- = The result is an estimated quantity, but the result may be biased low
mg/kg = milligram per kilogram

RSL = EPA Regional Screening Level (May 2023; THQ =1.0, Risk = 10-6)
<## = Analyte not detected at or above indicated Sample Quantitation Limit (SQL)

T-6 (1 of 1)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Table 7: Stage 2 Soil Sampling Results - Select Metals

Sample
Location

Sample Depth

(ft)

Analyte

Arsenic
(As)

Cadmium
(Cd)

Cobalt
(Co)

Lead
(Pb)

Zinc
(Zn)

Source Action Level(1)

14

0.66

69

41

450

Residential RSL

0.68

7.1

23

400

23,000

Industrial RSL

3.0

100

350

800

350,000

DP-1

2

9.6J

1.1 J

12J

138

183

5

2.0 / 2.7J

<0.52 / <0,49

6.4J/ 7.3J

2.0/2.0

33/42

10

2.4/ 1.9J

<0,52 / <0,49

5.9J/5.4J

1.9/1.3

29/29

15

4.9J

<0,60

12J

7.7

72

DP-2

2

3.5

0.65J

6.2J

138

263

5

4.9J

<0.57

11J

13

104

10

2.3

<0.60

<0.0

1.7

24

15

2.2

<0,48

5.9J

1.9

27

DP-3

3

3.4J



11 j

29J

90

5

2.5J



22J

6.2J

69

10

1.6J



5.8J

2.3J

31

15

3.6J



13J

4.6J

78

DP-4

2

6.0J

<0.56

5.8J

203

94

5

4.0J

<0,55

9.9J

4.0

60

10

1.8J

<0,53

5.7J

1.8

26

15

2.9J

<0,52

6.6J

2.1

37

DP-5

2

3.1J



11 j

4.9J

64

5

1.4J



6.8J

2.4J

37

10

2.2J





1.4J

20

15

4.7J



15J

6.6J

91

DP-6

2

4.9J

<0,54

12J

5.0

69

5

2.0J/2.4J

<0,52/<0,52

<5.2/6.4J

1.5/1.9

28/35

10

1.7J

<0,49

<4.9

1.1

22

15

6.8J

<0,53

8.9J

3.0

54

DP-7

2

8.3J

7.6 J

13J

612

3.160

5

2.6



5.7J

2.1

28

10

2.2





1.6

21

15

2.8



7.0J

2.6

36

DP-8

2

5.3J

0.56J

12J

49

161

5

6.2J/7.8J

<0.04 / <0.06

16J/19J

5.9J/6.8J

94/109

10

2.3J

<0,48

6.8J

1.9

38

15

4.1J

<0,50

12J

3.8

75

DP-9

2

13J

2.4 J

11J

152

661

5

6.4J

0.74 J

19J

15

120

10

2.1





1.6

23

15

2.4



5.8J

2.2

28

DP-10

2

2.6J

<0,53

11J

8.5J

65

5

2.1J

<0,55

8.5J

3.2J

47

10

0.74J

<0,49

<4.9

1.3J

21

15

3.4J

<0,00

16J

5.1J

95

Notes:

All values are reported in mg/kg

Bold & Underlined values indicate results that exceed Source Action
Level

Samples collected in June 2019

1 = Per the HRS, the action level to establish an on-site source of
contaminated soil is 'significantly above background" (see
Section 3.2.1).

Definitions:

J = The result is an estimated quantity

J+ = The result is an estimated quantity, but the result may be biased high
J- = The result is an estimated quantity, but the result may be biased low
mg/kg = milligram per kilogram

RSL = EPA Regional Screening Level (May 2023; THQ =1.0, Risk = 10-6)
<## = Analyte not detected at or above indicated Sample Quantitation Limit (SQL)

T-7 (1 of 1)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Table 8: Stage 2 Groundwater Sampling Results Summary - Select Analytes

Sample
Location

Screened
Interval
(ft-bgs)

Analyte

VOCs

Total Metals

Acetone

t-1,2-DCE

TCE

Arsenic
(As)

Cadmium
(Cd)

Cobalt
(Co)

Lead
(Pb)

Zinc
(Zn)

Federal MCL

--

100

5.0

Not Applicable <1>

CPT-1

96-100

3.1J

<0,50

<0,50

35

<5,0

64J

66

619

CPT-2

95-99

4.6J

0.12J

0.21 J

51J

50J

590J

455J-

5,080J

CPT-3

92-96

<5 0/3.6J

<0,50 /<0,5G

<0,50 /<0,5G

40J/ 28J

<25 /<10

276J/182J

155J/125J

1,760J/1,290J

CPT-4

96-100

14

0.15J

<0,50

100J

31 J

<250

935J-

33,300J

CPT-5

99-103

5.1

<0,50

<0,50

27

<5,0

51J

43

476

Notes:

All values are reported in micrograms per liter (ng/L)

Samples collected in June 2019

1 = Total Metal concentrations are not comparable to regulatory benchmarks derived from Dissolved Metal criteria,
such as MCLs.

Qualifier Definitions:

J = The result is an estimated quantity

J+ = The result is an estimated quantity, but the result may be biased high
J- = The result is an estimated quantity, but the result may be biased low

Definitions:

MCL = Maximum Contaminant Level
t-1,2-DCE = T rans-1,2-dichloroethylene
TCE = T richloroethylene
VOC = Volatile Organic Compound
[jg/L = microgram per liter

<## = Analyte not detected at or above indicated Sample Quantitation Limit (SQL)

T-8 (1 of 1)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Table 9: Stage 3 - Residential Soil Samp

ing - HRS Soil Screening Benchmarks

Analyte

HRS Soil Screening
Benchmark(1)

Residential

rsl(2)

Industrial

rsl(2)

Antimony

5.9

31

470

Arsenic

22

0.68

3.0

Barium

459

15,000

220,000

Beryllium

1.3

160

2,300

Cadmium

3.1

7.1

100

Chromium

65

	(2)

	(2)

Cobalt

26

23

350

Copper

142

3,100

47,000

Lead

401

400

800

Mercury

0.53

11

46

Molybdenum

3.3

390

5,800

Nickel

84

1,500

22,000

Selenium

9.2

390

5,800

Silver

4.7

390

5,800

Thallium

3.9

0.78

12

Vanadium

107

390

5,800

Zinc

630

23,000

350,000

Notes:

1	= The HRS Soil Screening Benchmark is used to establish a harardous substance release in the HRS soil exposure pathway and is based

on three times the background soil concentration. See Section 3.2.1.3 for a description of the methodology used to develop these values.

2	= EPA RSLs are presented for contextual purposes but are not appropriate for use as benchmarks under the HRS.

3	= an RSL for Total (i.e., unspeciated) chromium has not been established.

Definitions:

HRS =Hazard Ranking System

RSL = EPA Regional Screening Level (May 2023; THQ =1.0, Risk = 10-6)

T-9 (1 of 1)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Table 10: Stage 3 - Residential Soil Sampling Results - Four-Point Composite

Sub-RZ

Property

Sample No.

Yard

Analyte

Antimony

Arsenic

Barium

Beryllium

Cadmium

Chromium

Cobalt

Copper

Lead

Mercury

Mo

Nickel

Selenium

Silver

Thallium

Vanadium

Zinc

HRS Soil Screening Benchmark(1)

5.9

22

459

1.3

3.1

65

26

142

401

0.53

3.3

84

9.2

4.7

3.9

107

630

Residential RSL

31

0.68

15,000

160

7.1

„<2>

23

3,100

400

11

390

1,500

390

390

0.78

390

23,000



HR1A01

HR1A01-01

Front

0.95 JQK

9.1

170

<0.97

1.1

25

12

39

140

0.11

10 JQK

28 JK

<4.9

<2.4

17 JQK

44

200



HR1A01

HR1A01-02

Front

4.6

19

330

<1.1

1.4

29

14

65

150

0.17

0.91 JQK

25 JK

<5.5

<2.7

2.0 JQK

49

260



HR1A01

HR1A01-03

Front

12 JQK

8.6

190

<1.2

1.3

27

14

38

110

0.13

0.85 JQK

26 JK

<6.0

<3.0

1.9 JQK

50

250



HR1A01

HR1A01-03|D)

Front

12 JQK

10

190

<1.1

0.74 JQK

28

14

40

110

0.16

0.84 JQK

39

<5.6

<2.8

<5.6

53

260



HR1A02

HR1A02-01

Front

0.61 JQK

4.4

150

<1.0

0.97 JQK

28

13

42

89

0.11

0.91 JQK

21 JK

<5.2

<2.6

2.0 JQK

49

170



HR1A02

HR1A02-02

Rear

13 JQK

9.5

220

<1.1

1.9

51

13

55

170

0.25

0.83 JQK

24 JK

<5.3

<2.6

14 JQK

47

280



HR1A02

HR1A02-03

Rear

18 JQK

9.8

230

<0.92

2.4

49

13

70

270

0.26

1.2 JQK

26 JK

<4.6

0.55 JQK

19 JQK

47

380



HR1A03

HR1A03-01

Front

0.50 JQK

5.8

160

0.62 JQK

1.4

25

10

48

140 JK

0.20 JK

1.5 JQK

23

<6.2

<3.1

1.3 JQK

41

270

RZ-1a

HR1A03

HR1A03-02

Rear

16 JQK

5.0

460

0.63 JQK

1.8

32

11

75

380 JK

0.17 JK

H JQK

26

<5.5

0.62 JQK

1.0 JQK

42

570



HR1A03

HR1A03-03

Rear

12 JQK

4.4

200

0.69 JQK

1.4

28

12

44

120 JK

0.17 JK

1.0 JQK

22

0.47 JQK

<2.7

H JQK

46

290



HR1A04

HR1A04-01

Front

1.7 JQK

6.3

160 JK

<0.95

4.0

28

12

54

150

0.13 JK

1.7 JQK

27

<4.8

<2.4

<4.8

46 JK

500



HR1A04

HR1A04-02

Rear

14 JQK

7.1

200 JK

<1.0

1.3

27

12

58

130

0.12 JK

14 JQK

23

<5.1

<2.5

<5.1

47 JK

320



HR1A04

HR1A04-03

Rear

10 JQK

7.7

200 JK

<1.0

0.69 JQK

26

13

110

140

0.12 JK

0.95 JQK

32

<5.1

<2.6

<5.1

48 JK

380



HR1A05

HR1A05-01

Rear

16 JQK

4.7

190 JK

0.43 JQK

1.5

25

8.5

50

180

0.13 JK

1.4 JQK

21

<4.9

<2.4

H JQK

35 JK

350



HR1A05

HR1A05-02

Rear

18 JQK

5.1

240 JK

0.50 JQK

1.5

27

9.6

56

210

0.15 JK

1.4 JQK

27

<5.0

<2.5

<5.0

39 JK

400



HR1A05

HR1A05-03

Rear

15 JQK

5.3

340 JK

0.53 JQK

1.6

29

10

73

250

0.28 JK

1.0 JQK

20

<5.1

<2.6

2.0 JQK

38 JK

620



HR1A05

HR1A05-03(D)

Rear

1.7 JQK

5.2

380

0.53 JQK

2.0

28

11

73

270 JK

0.22 JK

10 JQK

20

<5.1

0.63 JQK

0.98 JQK

40

660



HR1B01

HR1B01-01

Front

<2.8

2.9

86 JK

<0.95

0.61 JQK

14

6.9

22

75

0.081 JK

0.47 JQK

11

<4.7

<2.4

<4.7

29 JK

110



HR1B01

HR1B01-02

Rear

2 JQK

3.3

170 JK

<1.0

2.3

22

6.5

45

280

0.14 JK

1 4 JQK

18

<5.2

<2.6

<5.2

27 JK

180



HR1B01

HR1B01-03

Rear

0.91 JQK

5.0

280 JK

<0.97

2.1

23

7.0

46

300

0.16 JK

0.91 JQK

14

<4.8

<2.4

<4.8

27 JK

400



HR1B01

HR1B01-03(D|

Rear

1 4 JQK

5.0

310

<1.0

1.6

27

6.4

44

310

0.15

0.98 JQK

14

<5.2

<2.6

<5.2

24

410



HR1B02

HR1B02-01

Front

1.0 JQK

4.3

140 JK

<0.94

2.1

25

12

40

170

0.19 JK

0.83 JQK

20

<4.7

<2.3

<4.7

45 JK

250



HR1B02

HR1B02-02

Rear

1.3 JQK

4.7

210 JK

<0.91

1.1

23

9.9

40

230

0.22 JK

0.85 JQK

17

<4.6

<2.3

<4.6

41 JK

230



HR1B02

HR1B02-03

Rear

1.2 JQK

7.5

270 JK

<0.96

1.6

25

12

56

190

0.18 JK

0.46 JQK

16

<4.8

<2.4

<4.8

45 JK

440



HR1B03

HR1B03-01

Front

0.97 JQK

7.2

160 JK

<0.87

3.7

51

12

60

140

0.99

0.78 JQK

30 JK

<4.4

-J -J JQK

2 Q JQK

45

260 JK



HR1B03

HR1B03-02

Rear

1.3 JQK

4.8

210 JK

<0.93

1.5

33

9.4

46

240

0.44 JK

0.93 JQK

23 JK

<4.6

0.81 JQK

1.3 JQK

38

280



HR1B03

HR1B03-03

Rear

-j q JQK

5.2

170 JK

<0.89

2.1

38

11

43

200

0.35 JK

0.74 JQK

17 JK

<4.4

0.75 JQK

-J g JQK

42

330



HR1B04

HR1B04-01

Front

2.3 JQK

51

150 JK

<1.1

1.0 JQK

24

12

38

110

0.22 JK

0.86 JQK

19 JK

<5.3

<2.6

2.1 JQK

46

200



HR1B04

HR1B04-02

Front

1.9 JQK

64

160 JK

<0.91

0.80 JQK

26

14

34

67

0.10 JK

0.77 JQK

20 JK

<4.5

<2.3

2.1 JQK

52

140



HR1B04

HR1B04-03

Front

1.0 JQK

29

140 JK

<0.95

0.82 JQK

24

12

31

75

0.11 JK

0.96 JQK

18 JK

<4.7

<2.4

1.4 JQK

51

200



HR1B05

HR1B05-01

Front

1 2 JQK

6.1

170 JK

<0.93

1.4

27

13

51

210

0.21 JK

-| -| JQK

33 JK

<4.6

<2.3

2.0 JQK

48

290



HR1B05

HR1B05-02

Front

2.7 JK

5.1

160 JK

<0.75

2.4

27

12

55

180

0.14 JK

2 JQK

22 JK

<3.7

<1.9

<3.7

47

290

RZ-1 b

HR1B05

HR1B05-03

Rear

2.3 JK

4.9

220 JK

<0.73

3.5

27

12

46

200

0.18 JK

0.79 JQK

31 JK

<3.6

<1.8

<3.6

46

290

HR1B06

HR1B06-01

Rear

0.89 JQK

4.7 JK

200

<0.59

1.3

23

18

68

170

0.15 JK

1.1 JQK

17

<2.9

0.45 JQK

0.68 JQK

29

310



HR1B06

HR1B06-02

Front

0.32 JQK

2.3 JK

98

<0.77

0.75 JQK

15

5.8

29

67

0.10 JK

0.55 JQK

13

<3.9

<1.9

0.96 JQK

24

170



HR1B06

HR1B06-03

Front

0.71 JQK

2.6 JK

100

<0.58

1.0 JK

17

6.2

31

100

0.26 JK

0.64 JQK

14

<2.9

<1.4

0.86 JQK

25

180



HR1B07

HR1B07-01

Front

2.6

9.9 JK

190

<0.64

2.7 JK

34

14

67

140

0.30 JK

2.0

35

0.53 JQK

<1.6

<3.2

50

280



HR1B07

HR1B07-02

Rear

2.2

8.7 JK

200

<0.69

2.6 JK

31

15

50

130

0.23 JK

0.95 JQK

32

<3.5

<1.7

<3.5

51

270



HR1B07

HR1B07-03

Rear

3.2

13 JK

210

<1.0

3.1 JK

35

15

67

150

0.24 JK

1.6 JQK

30

<5.1

<2.6

<5.1

54

380



HR1B08

HR1B08-01

Front

0.95 JQh

2.3 JQK

120 JK

0.25 JQK

1.8

24

4.8

30

180

0.33 JK

0.72 JQK

16

<5.1

<2.6

<5.1

22 JK

200



HR1B08

HR1B08-02

Rear

0.93 JQh

5.2

220 JK

0.36 JQK

2.7

38

7.7

51

270

0.20 JK

0 96 JQK

25

<4.7

<2.3

0.57 JQK

31 JK

520



HR1B08

HR1B08-03

Rear

1.3 JQh

4.2

200 JK

0.38 JQK

1.8

29

7.9

44

200

0.71 JK

0.72 JQh

17

<4.6

<2.3

<4.6

33 JK

380



HR1B09

HR1B09-01

Front

0.79 JQh

5.0

140 JK

<0.93

0.70 JQK

23

11

43

86

0.10 JK

0.97 JQh

17 JK

<4.6

<2.3

19 JQK

45

220



HR1B09

HR1B09-02

Rear

1 4 JQK

4.3

170 JK

<0.80

1.3

25

10

46

150

0.16 JK

0.89 JQK

16 JK

<4.0

<2.0

0.89 JQK

40

270



HR1B09

HR1B09-03

Rear

0.93 JQK

7.5

160 JK

<0.83

0.86

24

11

53

140

0.12 JK

-| -| JQK

17 JK

<4.1

<2.1

1.6 JQK

42

240



HR1B10

HR1B10-01

Front

0.77 JQK

3.2

110 JK

<0.77

0.71 JQK

21

8.2

33

78

0.10 JK

0.56 JQK

26 JK

<3.8

<1.9

0.82 JQK

34

190



HR1B10

HR1B10-02

Rear

<2.8

5.5

120 JK

<0.94

1.0

36

7.2

29

110

0.095 JK

0.39 JQK

10 JK

<4.7

<2.3

<4.7

37

190



HR1B10

HR1B10-03

Rear

0.89 JQK

6.0

190 JK

<0.75

1.6

40

8.0

36

190

0.18 JK

0.60 JQK

13 JK

<3.7

0.75 JQK

0.39 JQK

36

320



HR1B10

HR1B10-03(D)

Rear

1.1 JQK

6.9

220

<1.0

2.1

43

8.4

42

240

0.18

0.86 JQK

14

<5.1

<2.6

<5.1

34

410

T-10 (1 of 6)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Sub-RZ

Property

Sample No.

Yard

Analyte

Antimony

Arsenic

Barium

Beryllium

Cadmium

Chromium

Cobalt

Copper

Lead

Mercury

Mo

Nickel

Selenium

Silver

Thallium

Vanadium

Zinc

HRS Soil Screening Benchmark(1)

5.9

22

459

1.3

3.1

65

26

142

401

0.53

3.3

84

9.2

4.7

3.9

107

630





Residential RSL

31

0.68

15,000

160

7.1

„<2>

23

3,100

400

11

390

1,500

390

390

0.78

390

23,000



HR1C01

HR1C01-01

Front

-| -| JQK

7.6

180 JK

<0.99

0.80 JQK

32

14

51

150

0.17 JK

1.3 JQK

23

<4.9

<2.5

<4.9

55 JK

260



HR1C01

HR1C01-02

Rear

2 2 J^k

8.3

290 JK

<0.87

1.6

44

13

110

430

0.14 JK

4.3

82

<4.3

0.50 JQK

<4.3

41 JK

460



HR1C01

HR1C01-03

Rear

-| 4 JQK

5.9

230 JK

<0.98

1.3

32

14

73

200

0.12 JK

16 JQK

35

<4.9

<2.5

<4.9

50 JK

400



HR1C02

HR1C02-01

Front

0.80 JQK

5.1

170

0.47 JQK

1.2

28

9.0

46

120 JK

0.15 JK

0.85 JQK

20

<5.7

<2.8

0.64 JQK

38

200



HR1C02

HR1C02-01(D|

Front

0.52 JQK

5.0

150

0.45 JQK

1.2

28

9.0

43

120 JK

0.15 JK

0.77 JQK

20

<5.9

<2.9

H JQK

37

200



HR1C02

HR1C02-02

Front

<3.2

3.9

130

0.36 JQK

1.2

23

7.1

42

110 JK

0.19 JK

0.47 JQK

13

<5.4

<2.7

0.73 JQK

24

260



HR1C02

HR1C02-03

Front

0.63 JQK

6.3

150

0.45 JQK

1.5

30

8.7

50

150 JK

0.23 JK

0.86 JQK

24

<5.3

<2.7

<5.3

36

360



HR1C03

HR1C03-01

Front

2.3 JQK

5.5

160 JK

<1.1

2.9

29

13

63

170

0.24 JK

10 JQK

23

<5.4

<2.7

<5.4

50 JK

280



HR1C03

HR1C03-02

Rear

1.7 JQK

5.9

200 JK

<1.0

1.4

33

14

79

170

0.14 JK

14 JQK

33

<5.2

<2.6

<5.2

52 JK

350



HR1C03

HR1C03-03

Rear

12 JQK

5.1

190 JK

<1.0

1.0

28

13

57

130

0.13 JK

0.74 JQK

44

<5.1

<2.5

<5.1

50 JK

210



HR1C04

HR1C04-01

Front

0.60 JQK

5.5

180 JK

<1.0

0.91 JQK

19

7.3

34 JK

250

0.18

0.45 JQK

13

<5.0

<2.5

<5.0

32 JK

490



HR1C04

HR1C04-02

Rear

0.70 JQK

5.8

200 JK

<1.0

0.77 JQK

19

6.9

31 JK

230

0.17

0.41 JQK

15

<5.0

<2.5

<5.0

29 JK

440

RZ-1c

HR1C04

HR1C04-03

Rear

0.97 JQK

7.2

130 JK

<1.0

0.92 JQK

28

8.1

58 JK

260

0.16

0.95 JQK

16

<5.0

<2.5

<5.0

37 JK

300



HR1C05

HR1C05-01

Front

2.5

4.1

140 JK

<0.56

3.0

24

11

70 JK

270 JK

0.20

1.1

24 JK

<2.8

<1.4

<2.8

41 JK

270



HR1C05

HR1C05-02

Rear

0.61 JQK

5.3 JK

140

<1.0

1.0

22

13

45 JK

150 JK

0.18

0.91 JQK

47 JK

<5.0

<2.5

<5.0

46 JK

240



HR1C05

HR1C05-03

Rear

2.6

3.4

140 JK

<0.53

3.9

24

11

59 JK

290 JK

0.15

1.1

25 JK

<2.7

<1.3

<2.7

40 JK

300



HR1C06

HR1C06-01

Front

0.73 JQK

3.4

96 JK

<0.98

0.92 JQK

24

7.1

36

120

0.18 JK

0.50 JQK

17

<4.9

<2.5

<4.9

31 JK

160



HR1C06

HR1C06-01(D)

Front

0.70 JQK

3.0

94

<0.84

1.3

24

7.1

36

110

0.17 JK

0.61 JQK

17

<4.2

0.53 JQK

1.3 JQK

30 JK

150



HR1C06

HR1C06-02

Front

0.96 JQK

4.4

110 JK

<0.96

2.3

29

7.3

44

150

0.19 JK

0.63 JQK

28

<4.8

0.61 JQK

<4.8

32 JK

220



HR1C06

HR1C06-02(D)

Front

0.63 JQK

3.5

100

<0.56

2.1

28

7.2

41

140

0.21 JK

0.60 JQK

27

<2.8

0.51 JQK

16 JQK

30 JK

210



HR1C06

HR1C06-03

Front

0.99 JQK

4.4

130 JK

<0.96

1.1

28

8.7

42

150

0.15 JK

0.60 JQK

18

<4.8

0.58 JQK

<4.8

37 JK

210



HR1C06

HR1C06-03(D)

Front

0.76 JQK

3.7

170

<0.80

1.4

26

8.0

40

170

0.19 JK

0.60 JQK

17

<4.0

0.47 JQK

14 JQK

33 JK

190



HR1C07

HR1C07-01

Front

0.82 JQK

5.7

720

<1.3

2.6

41

14

57

250

0.20

14 JQK

26 JK

<6.4

<3.2

2.1 JQK

50

530



HR1C07

HR1C07-02

Rear

18 JQK

4.9

210

<1.0

1.6

30

13

55

180

0.24

0.92 JQK

22 JK

<5.2

<2.6

2.2 JQK

48

260



HR1C07

HR1C07-03

Rear

1.2 JQK

4.8

270

<1.0

1.5

29

12

60

190

0.13

1.3 JQK

22 JK

<5.2

<2.6

14 JQK

45

280



HR2A01

HR2A01-01

Rear

1.1 JQK

6.1 JK

280

<1.1

2.2 JK

31

13

700

910

0.50 JK

14 JQK

34

<5.4

<2.7

18 JQK

51

490



HR2A01

HR2A01-02

Rear

0.90 JQK

6.3 JK

250

<1.2

2.2 JK

33

12

60

740

0.38 JK

H JQK

63

<6.1

<3.1

2.0 JQK

48

410



HR2A01

HR2A01-03

Front

0.84 JQK

7.6 JK

210

<0.89

3.0 JK

46

13

74

440

0.58 JK

0.98 JQK

23

<4.4

0.89 JQK

1.9 JQK

51

290



HR2A02

HR2A02-01

Front

0.47 JQK

4.2

100 JK

<0.97

1.0

34

7.5

23 JK

140

0.26 JK

0.73 JQK

15

<4.8

<2.4

0.69 JQK

32 JK

180



HR2A02

HR2A02-02

Rear

-j ~i JQK

12

200 JK

<0.72

2.0

77

9.1

43 JK

210

0.26 JK

2.7

21

<3.6

0.46 JQK

-j 0 JQK

38 JK

380



HR2A02

HR2A02-03

Rear

-| g JQK

10

220 JK

<0.92

2.1

62

8.9

42 JK

310

0.25 JK

-| y JQK

19

<4.6

<2.3

0.98 JQK

38 JK

450



HR2A03

HR2A03-01

Front

0.60 JQK

3.3

100 JK

<1.1

0.71 JQK

18

7.9

22 JK

76

0.12 JK

0.75 JQK

16

<5.3

<2.7

1.3 JQK

34 JK

140



HR2A03

HR2A03-02

Front

0.36 JQK

3.2

100 JK

<0.74

0.80

19

8.0

22 JK

77

0.097 JK

0.77 JQK

13

<3.7

<1.8

10 JQK

34 JK

160



HR2A03

HR2A03-03

Rear

0.40 JQK

5.1

120 JK

<1.1

0.99 JQK

20

8.6

45 JK

96

0.15 JK

0.89 JQK

15

<5.4

<2.7

15 JQK

37 JK

270



HR2A04

HR2A04-01

Front

0.61 JQK

3.0

260

0.36 JQK

1.2

23

7.0

38

150 JK

0.10 JK

1.3 JQK

18

<4.8

<2.4

0.58 JQK

29

220



HR2A04

HR2A04-02

Rear

-| -| JQK

2 g JQK

130

0.26 JQK

1.5

18

5.5

42

270 JK

0.21 JK

-| -| JQK

24

<5.1

<2.5

<5.1

24

370

RZ-2a

HR2A04

HR2A04-02(D|

Rear

-| Q JQK

3.2

140

0.30 JQK

1.6

19

6.1

42

230 JK

0.55 JK

0.67 JQK

26

<5.1

<2.5

<5.1

27

370



HR2A04

HR2A04-03

Rear

1 2 JQK

3.0

120

0.31 JQK

1.5

20

6.5

44

170 JK

0.20 JK

0.81 JQK

21

<5.0

<2.5

<5.0

27

290



HR2A05

HR2A05-01

Front

0.81 JQK

4.1

130 JK

<0.94

0.98

21

9.1

38

150

0.17 JK

0.90 JQK

27

<4.7

<2.3

<4.7

41 JK

320



HR2A05

HR2A05-02

Front

0.66 JQK

3.8

130 JK

<0.92

0.66 JQK

23

9.7

33

150

0.12 JK

0.45 JQK

17

<4.6

<2.3

<4.6

47 JK

200



HR2A05

HR2A05-02(D|

Front

0.76 JQK

2.5 JQK

120

0.38 JQK

1.1

20

7.2

31

160 JK

0.12 JK

0.51 JQK

16

<4.6

<2.3

0.47 JQK

35

200



HR2A05

HR2A05-03

Rear

2.1 JQK

4.9

260 JK

<0.97

1.8

22

7.7

64

410

0.19 JK

0.76 JQK

23

<4.9

0.85 JQK

<4.9

36 JK

770



HR2A06

HR2A06-01

Front

0.40 JQK

2.7 JK

120

<0.79

1.1 JK

17

6.8

27

160

0.27 JK

0.53 JQK

14

<4.0

<2.0

0.69 JQK

30

230



HR2A06

HR2A06-02

Front

0.46 JQK

2.3 JQK

92

<0.83

0.87 JK

15

6.5

26

120

0.30 JK

0.53 JQK

13

<4.2

<2.1

0.84 JQK

28

180



HR2A06

HR2A06-03

Rear

1.5 JQK

4.2 JK

210

<0.63

2.7 JK

22

7.4

34

300

1.8 JK

0.68 JQK

24

<3.1

<1.6

0.84 JQK

32

520



HR2A07

HR2A07-01

Front

<3.6

19 JQK

85 JK

<1.2

0.45 JQK

16

7.2

16

49

0.12 JK

0.33 JQK

11

<6.0

<3.0

<6.0

30 JK

110



HR2A07

HR2A07-02

Front

<3.0

2.7 JQK

110 JK

<1.0

0.61 JQK

16

8.2

21

48

0.25 JK

0.40 JQK

12

<5.1

<2.5

<5.1

33 JK

160



HR2A07

HR2A07-03

Rear

1.9 JQK

8.7

250 JK

<1.1

1.6

33

11

320

360

0.38 JK

13 JQK

23

<5.5

<2.7

<5.5

42 JK

800



HR2B01

HR2B01-01

Front

1.1 JQK

2.5 JQK

120 JK

0.26 JQK

0.76 JQK

17

5.4

33

110

0.11 JK

0.68 JQK

12

<4.4

<2.2

0.66 JQK

27 JK

250



HR2B01

HR2B01-02

Rear

2.2 JQK

2.7 JQK

120 JK

0.33 JQK

0.82 JQK

16

6.6

22

190

0.17 JK

0.22 JQK

13

<4.9

<2.5

<4.9

33 JK

170



HR2B01

HR2B01-03

Rear

0.67 JQK

3.1

160 JK

0.32 JQK

0.96 JQK

20

6.5

42

190

0.16 JK

0.48 JQK

19

<4.9

<2.5

<4.9

33 JK

330



HR2B02

HR2B02-01

Front

0.79 JQK

3.1

110

<0.93

0.63 JQK

16

6.8

28

140

0.25

0.66 JQK

14

<4.6

<2.3

<4.6

27

220



HR2B02

HR2B02-02

Rear

1.9 JQK

2.9 JQK

170

<1.0

0.66 JQK

17

6.6

41

160

0.21

0.77 JQK

14

<5.0

<2.5

<5.0

24

350



HR2B02

HR2B02-03

Rear

0.80 JQK

3.3

110

<1.0

0.33 JQK

11

5.8

18

92

0.14

0.29 JQK

8.3

<5.2

<2.6

<5.2

22

190

T-10 (2 of 6)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Sub-RZ

Property

Sample No.

Yard

Analyte

Antimony

Arsenic

Barium

Beryllium

Cadmium

Chromium

Cobalt

Copper

Lead

Mercury

Mo

Nickel

Selenium

Silver

Thallium

Vanadium

Zinc

HRS Soil Screening Benchmark(1)

5.9

22

459

1.3

3.1

65

26

142

401

0.53

3.3

84

9.2

4.7

3.9

107

630





Residential RSL

31

0.68

15,000

160

7.1

„<2>

23

3,100

400

11

390

1,500

390

390

0.78

390

23,000



HR2B03

HR2B03-01

Front

0.80 JQK

4.4

110 JK

<0.88

1.0

20

8.0

28

140

0.22 JK

0.56 JQK

15 JK

<4.4

<2.2

1 o JQK

34

240



HR2B03

HR2B03-02

Rear

0.63 JQK

2 4 jqk

130 JK

<0.83

0.91

18

8.3

29

150

0.31 JK

0.47 JQK

13 JK

<4.1

<2.1

0.63 JQK

36

260



HR2B03

HR2B03-03

Rear

-| -| JQK

3.8

170 JK

<0.88

1.2

25

9.0

44

200

0.35 JK

0.97 JQK

22 JK

<4.4

0.66 JQK

0.45 JQK

37

310



HR2B04

HR2B04-01

Front

1.1 JQK

5.3

130

<0.89

0.51 JQK

22

8.5

32

180

0.25

1.1 JQK

16

<4.4

<2.2

<4.4

37

270

RZ-2b

HR2B04

HR2B04-02

Rear

0.66 JQK

4.9

150

<0.95

0.80 JQK

20

7.9

38

160

0.15

0.46 JQK

17

<4.8

<2.4

<4.8

37

310



HR2B04

HR2B04-03

Rear

0.73 JQK

5.1

230

<0.92

0.82 JQK

31

7.8

49

210

0.23

1.4 JQK

19

<4.6

<2.3

<4.6

30

360



HR2B05

HR2B05-01

Front

0.83 JQK

3.0

120

<0.94

1.0

27

8.0

34

130

0.25 JK

0.87 JQK

14

<4.7

<2.4

<4.7

36

210



HR2B05

HR2B05-02

Rear

0.45 JQK

3.3

130

<0.90

1.0

26

8.1

34

150

0.23 JK

0.60 JQK

16

<4.5

<2.2

<4.5

38

270



HR2B05

HR2B05-03

Rear

0.79 JQK

3.6

150

<0.91

1.5

26

7.5

37

240

0.31 JK

0.68 JQK

17

<4.6

0.52 JQK

<4.6

35

370



HR2B06

HR2B06-01

Rear

12 JQK

2.8 JK

240

<0.88

1.4 JK

27

9.5

45

250

0.49 JK

0.62 JQK

17

<4.4

<2.2

10 JQK

35

370



HR2B06

HR2B06-02

Rear

1.1 JQK

3.0 JK

190

<0.71

1.7 JK

26

8.3

42

240

0.55 JK

0.62 JQK

17

<3.6

<1.8

10 JQK

31

380



HR2B06

HR2B06-03

Front

0.63 JQK

3.1 JK

110

<0.73

1.2 JK

21

7.2

25

76

0.43 JK

0.45 JQK

14

<3.6

0.53 JQK

0.66 JQK

30

190



HR2B07

HR2B07-01

Front

0.37 JQK

2.5 JK

100

<0.68

0.59 JQK

18

6.4

30

69

0.14 JK

0.54 JQK

15

<3.4

0.69 JQK

1.3 JQK

25

130



HR2B07

HR2B07-02

Front

0.52 JQK

2.8 JK

120

<0.89

0.86 JQK

20

6.1

44

75

0.25 JK

0.77 JQK

14

<4.4

0.92 JQK

H JQK

24

180



HR2B07

HR2B07-03

Rear

4.0

6.5 JK

140

<0.59

1.2 JK

20

6.9

47

380

0.15 JK

0.78 JQK

13

<2.9

0.38 JQK

1 2 JQK

26

310



HR2C01

HR2C01-01

Front

0.33 JQK

3.9

110 JK

<1.1

0.55 JQK

21

8.1

33

84

0.24 JK

0.47 JQK

19

<5.6

<2.8

<5.6

33 JK

180



HR2C01

HR2C01-02

Rear

1.2 JQK

12

210 JK

<0.90

1.1

29

11

57

180

0.27 JK

0.67 JQK

18

<4.5

0.80 JQK

<4.5

42 JK

350



HR2C01

HR2C01-03

Rear

1.0 JQK

16

170 JK

<1.0

1.3

28

10

47

150

0.27 JK

0.59 JQK

25

<5.0

H JQK

<5.0

39 JK

290



HR2C02

HR2C02-01

Front

0.62 JQK

9.6

130

<1.0

0.99 JQK

17

7.9

35

250

0.15 JK

0.79 JQK

14

<5.2

<2.6

<5.2

29

220



HR2C02

HR2C02-02

Front

0.64 JQK

9.5

150

<1.0

0.62 JQK

17

8.5

32

190

0.21 JK

0.73 JQK

15

<5.2

<2.6

<5.2

31

260



HR2C02

HR2C02-03

Front

0.65 JQK

4.2

120

<1.1

0.63 JQK

16

7.3

31

140

0.27 JK

0.72 JQK

14

<5.3

<2.6

<5.3

29

190



HR2C03

HR2C03-01

Front

0.54 JQK

3.3

110 JK

0.37 JQK

0.78 JQK

19

7.2

32

120

0.12 JK

0.68 JQK

18

<5.0

<2.5

<5.0

35 JK

190



HR2C03

HR2C03-02

Rear

0.56 JQK

3.5

110 JK

0.33 JQK

0.73 JQK

18

6.6

26

89

0.12 JK

0.49 JQK

12

<4.5

<2.2

<4.5

32 JK

160



HR2C03

HR2C03-03

Rear

0.73 JQK

3.1

140 JK

0.41 JQK

0.96 JQK

20

7.8

34

130

0.081 JK

0.71 JQK

14

<5.0

<2.5

19 JQK

35 JK

240



HR2C04

HR2C04-01

Front

0.76 JQK

2.5 JQK

100 JK

<0.94

0.57 JQK

17

6.7

38

74

0.16 JK

0.59 JQK

11

<4.7

0.64 JQK

<4.7

28 JK

170



HR2C04

HR2C04-01(D|

Front

0.45 JQK

2.3 JQK

110

0.30 JQK

0.96

17

5.8

39

85 JK

0.18 JK

0.68 JQK

12

<4.7

0.53 JQK

1 2 JQK

25

180

RZ-2c

HR2C04

HR2C04-02

Rear

0.81 JQK

3.8

140 JK

<0.93

0.92 JQK

20

7.4

41

130

0.27 JK

0.61 JQK

14

<4.6

<2.3

<4.6

31 JK

260



HR2C04

HR2C04-03

Rear

0.96 JQK

3.1

140

<0.79

1.5

21

7.4

44

130

0.14 JK

0.82 JQK

18

<3.9

0.60 JQK

-| g JQK

30 JK

260



HR2C05

HR2C05-01

Front

10 JQK

13

110 JK

<1.2

1.7

28

8.5

45

130

0.22 JK

0.46 JQK

16

<5.9

<3.0

<5.9

40 JK

180



HR2C05

HR2C05-02

Rear

0.77 JQK

23

120 JK

<1.2

2.0

21

8.1

40

120

0.40 JK

0.47 JQK

13

<6.1

<3.0

<6.1

37 JK

290



HR2C05

HR2C05-03

Rear

0.61 JQK

3.4

110 JK

<0.93

0.98

23

8.3

34 JK

120 JK

0.16

0.43 JQK

13

<4.6

<2.3

<4.6

40 JK

230



HR2C05

HR2C05-03(D)

Rear

0.65 JQK

3.3

110

<0.99

0.91 JQK

23

8.0

32

110

0.14

0.41 JQK

13

<5.0

<2.5

<5.0

38

220



HR2C06

HR2C06-01

Front

0.64 JQK

2.6 JQK

120 JK

<1.1

1.1

22

8.1

43 JK

120

0.26 JK

1.3 JQK

26

<5.3

<2.6

1.3 JQK

35 JK

220



HR2C06

HR2C06-02

Rear

•1 2 JQK

7.1

350 JK

<1.0

3.1

34

9.6

68 JK

550

0.19 JK

1 2 JQK

25

<5.2

0.61 JQK

-| -| JQK

39 JK

680



HR2C06

HR2C06-03

Rear

-| -| JQK

6.0

300 JK

<0.91

2.1

31

11

55 JK

430

0.15 JK

0.91 JQK

17

<4.6

0.64 JQK

-| -| JQK

44 jk

500



HR2C07

HR2C07-01

Front

0.76 JQK

9.1

140 JK

<1.1

1.6

33

9.4

42 JK

230 JK

0.23

0.72 JQK

20

<5.6

<2.8

<5.6

36 JK

250



HR2C07

HR2C07-02

Rear

0.56 JQK

9.0

150 JK

<1.0

1.2

29

9.1

39 JK

160 JK

0.26

0.58 JQK

15

<5.0

0.58 JQK

<5.0

35 JK

240



HR2C07

HR2C07-03

Rear

0.52 JQK

7.5

130 JK

<0.97

1.2

29

9.7

41 JK

98 JK

0.28

0.54 JQK

14

<4.8

<2.4

<4.8

37 JK

210



HR3A01

HR3A01-01

Side

•1 0 JQK

4.9 JK

130

<0.53

1.9 JK

20

9.5

34

84

0.11 JK

0.47 JQK

29

<2.7

<1.3

<2.7

39

290



HR3A01

HR3A01-02

Rear

0.61 JQK

6.1 JK

110 JK

<0.95

1.3

22 JK

9.1 JK

28 JK

90

0.078 JK

0.47 JQK

16 JK

0.48 JQK

<2.4

1 2 JQK

39 JK

330



HR3A01

HR3A01-03

Front

0.83 JQK

6.2 JK

110 JK

<1.0

1.2

22 JK

9.5 JK

33 JK

93

0.12 Jh

0.81 JQK

17 JK

0.71 JQK

<2.5

12 JQK

40 JK

340



HR3A02

HR3A02-01

Rear

0.95 JQK

7.9 JK

180 JK

<1.0

1.2

24 JK

9.1 JK

41 JK

290

0.21 Jh

0.86 JQK

17 JK

0.53 JQK

<2.5

1.5 JQI

39 JK

280



HR3A02

HR3A02-02

Side

0.79 JQK

H JK

140 JK

<0.96

1.7

24 JK

9.0 JK

40 JK

310

0.23 Jh

0.73 JQK

50 JK

0.54 JQK

0.54 JQK

16 JQK

39 JK

300



HR3A02

HR3A02-03

Front

0.58 JQK

4.8 JK

140 JK

<1.1

0.97 JQK

23 JK

8.7 JK

37 JK

150

0.28 Jh

0.83 JQK

22 JK

0.55 JQK

10 JQK

1.3 JQI

38 JK

250



HR3A03

HR3A03-01

Front

10 JQK

3.2 JK

150 JK

<1.1

0.80 JQK

19 JK

8.1 JK

38 JK

110

0.21 Jh

0.70 JQK

15 JK

<5.4

<2.7

0.89 JQK

37 JK

180

RZ-3a

HR3A03

HR3A03-02

Rear

H JQK

4.5 JK

220 JK

<0.91

1.1

46 JK

8.5 JK

47 JK

530

0.61 Jh

4.1

23 JK

0.89 JQK

1.2 JQK

14 JQK

36 JK

340



HR3A03

HR3A03-03

Rear

13 JQK

4.9 JK

280 JK

<0.90

1.1

19 JK

8.1 JK

40 JK

720

0.33 Jh

0.48 JQK

32 JK

12 JQK

0.89 JQK

13 JQK

37 JK

440



HR3A04

HR3A04-01

Rear

0.53 JQK

4.6 JK

110 JK

<0.97

0.65 JQK

16 JK

6.6 JK

27 JK

96

0.27 Jh

0.62 JQI

17 JK

<4.8

0.54 JQK

<4.8

37 JK

190



HR3A04

HR3A04-02

Rear

0.74 JQK

4.2 JK

100 JK

<0.94

0.63 JQK

17 JK

7.2 JK

29 JK

130

1.3 Jh

0.44 JQK

20 JK

0.61 JQK

<2.3

0.47 JQK

39 JK

180



HR3A04

HR3A04-03

Front

0.73 JQK

3.4 JK

120 JK

<0.95

0.68 JQK

17 JK

6.6 JK

35 JK

110

0.41 Jh

0.57 JQK

20 JK

0.71 JQK

<2.4

10 JQK

31 JK

200



HR3A05

HR3A05-01

Rear

12 JQK

5.0 JK

220 JK

<0.93

0.88 JQK

18 JK

7.4 JK

32 JK

140

0.21 Jh

0.45 JQK

12 JK

<4.7

<2.3

0.60 JQK

37 JK

340



HR3A05

HR3A05-02

Front

0.95 JQK

4.0 JK

130 JK

<1.0

0.78 JQK

19 JK

8.2 JK

31 JK

140

0.26 JK

0.64 JQK

20 JK

0.47 JQK

<2.6

0.65 JQK

40 JK

210



HR3A05

HR3A05-03

Front

0.39 JQK

2.3 JQK

96 JK

<0.92

0.45 JQK

14 JK

6.4 JK

21 JK

78

0.34 JK

0.34 JQK

-| -| JK

0.37 JQK

<2.3

0.77 JQK

32 JK

140

1-10(3 of 6)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Sub-RZ

Property

Sample No.

Yard

Analyte

Antimony

Arsenic

Barium

Beryllium

Cadmium

Chromium

Cobalt

Copper

Lead

Mercury

Mo

Nickel

Selenium

Silver

Thallium

Vanadium

Zinc

HRS Soil Screening Benchmark(1)

5.9

22

459

1.3

3.1

65

26

142

401

0.53

3.3

84

9.2

4.7

3.9

107

630





Residential RSL

31

0.68

15,000

160

7.1

„<2>

23

3,100

400

11

390

1,500

390

390

0.78

390

23,000



HR3B01

HR3B01-01

Front

0.54 JQK

2.5

140 JK

<0.81

0.76 JQK

19

8.8

26 JK

95

0.099 JK

0.48 JQK

19

<4.1

<2.0

0.57 JQK

40 JK

160



HR3B01

HR3B01-02

Rear

1.1 JQK

7.3

280 JK

<0.77

1.9

28

10

57 JK

290

0.31 JK

0.73 JQK

16

<3.9

0.65 JQK

<3.9

48 JK

320



HR3B01

HR3B01-03

Rear

1.9

4.9

190 JK

<0.64

1.3

25

8.2

55 JK

200

0.19 JK

0.72 JQK

15

<3.2

0.57 JQK

0.45 JQK

41 JK

260



HR3B02

HR3B02-01

Front

0.54 JQK

3.0

110 JK

<0.91

0.75 JQK

21

11

27 JK

110

0.080 JK

0.65 JQK

17

<4.5

<2.3

0.92 JQK

48 JK

150



HR3B02

HR3B02-01(D|

Front

0.92 JQK

3.6

110

<0.98

0.33 JQK

20

10

26

98

0.17

0.93 JQK

16

<4.9

<2.5

<4.9

45

140



HR3B02

HR3B02-02

Rear

-J g JQK

2.7

240 JK

<0.92

1.2

20

8.5

31 JK

150

0.15 JK

0.49 JQK

13

<4.6

<2.3

-J -J JQK

36 JK

340



HR3B02

HR3B02-03

Rear

-| 2 JQK

3.5

260 JK

<1.0

1.2

21

8.9

37 JK

180

0.10 JK

0.61 JQK

16

<5.2

<2.6

-| -| JQK

38 JK

310



HR3B03

HR3B03-01

Front

0.56 JQK

2.9 JQK

110

<1.2

0.63 JQK

17

8.7

24

64

0.13 JK

0.60 JQK

13

<6.0

<3.0

1.4 JQK

38 JK

130



HR3B03

HR3B03-02

Rear

0.59 JQK

2.9

120

<0.85

0.89

21

10

27

84

0.13 JK

0.50 JQK

45

<4.2

<2.1

0.74 JQK

42 JK

150



HR3B03

HR3B03-03

Rear

0.92 JQK

3.0

170

<0.93

1.5

21

9.3

41

160

0.24 JK

0.73 JQK

16

<4.7

<2.3

1.7 JQK

38 JK

280



HR3B04

HR3B04-01

Front

0.69 JQK

3.2 JQK

140

<1.1

0.99 JQK

21

9.6

30

100

0.23 JK

0.53 JQK

21

<5.5

<2.8

1 4 JQK

39 JK

190



HR3B04

HR3B04-02

Rear

1 2 JQK

5.0

160

<1.0

1.2

22

9.0

39

140

0.30 JK

0.63 JQK

15

<5.2

<2.6

1 2 JQK

38 JK

250

RZ-3b

HR3B04

HR3B04-03

Rear

0.85 JQK

4.0

190

<1.1

1.1

23

9.2

33

120

0.16 JK

0.65 JQK

20

<5.7

<2.8

0.90 JQK

39 JK

260

HR3B05

HR3B05-01

Front

0.80 JQK

3.1

140

<0.88

0.88

22

8.8

34

130

0.33 JK

0.58 JQK

20

<4.4

0.51 JQK

1.3 JQK

40 JK

290



HR3B05

HR3B05-02

Rear

1.5 JQK

5.5

310

<0.90

1.8

26

9.5

48

850

0.23 JK

0.80 JQK

19

<4.5

0.82 JQK

1.7 JQK

41 JK

630



HR3B05

HR3B05-03

Rear

1.0 JQK

3.3

210

<0.90

1.1

24

9.8

40

330

0.22 JK

0.67 JQK

15

<4.5

0.70 JQK

2.7 JQK

40 JK

440



HR3B06

HR3B06-01

Front

0.36 JQK

2.2

110 JK

<0.64

0.80

19

8.1

26 JK

95

0.11 JK

0.37 JQK

14

<3.2

<1.6

0.72 JQK

37 JK

150



HR3B06

HR3B06-01(D|

Front

0.67 JQK

2.3

100

<0.73

0.74

18

7.7

25

86

0.16 JK

0.32 JQK

13

<3.7

<1.8

1 -J JQK

34 JK

140



HR3B06

HR3B06-02

Rear

-| -| JQK

2.8 JQK

200 JK

<0.97

1.4

19

8.6

35 JK

270

0.15 JK

0.63 JQK

24

<4.9

0.63 JQK

0.70 JQK

36 JK

400



HR3B06

HR3B06-03

Rear

1 0 JQK

2.1

150 JK

<0.62

1.2

16

7.6

32 JK

180

0.19 JK

0.43 JQK

14

<3.1

<1.5

0.73 JQK

33 JK

290



HR3B07

HR3B07-01

Front

0.82 JQK

5.5

100 JK

<1.1

0.98 JQK

23

7.9

32 JK

92 JK

0.17

0.40 JQK

23

<5.3

<2.6

<5.3

34 JK

150



HR3B07

HR3B07-02

Rear

12 JQK

4.9

180 JK

<0.99

1.8

22

8.5

45 JK

200 JK

0.27

0.92 JQK

18

<5.0

0.61 JQK

<5.0

33 JK

380



HR3B07

HR3B07-03

Front

15 JQK

3.5 JQK

260 JK

<1.2

1.-1 JQK

24

8.1

36 JK

210 JK

0.15

0.54 JQK

14

<6.2

<3.1

<6.2

33 JK

280



HR3B08

HR3B08-01

Front

0.67 JQK

5.2

150 JK

0.34 JQK

2.5

100

7.0

46

160

0.31 JK

0.83 JQK

20

<5.3

<2.6

-J -J JQK

34 JK

280



HR3B08

HR3B08-02

Rear

0.64 JQK

6.3

190 JK

0.40 JQK

1.6

45

6.9

41

280

0.31 JK

0.53 JQK

15

<5.1

<2.6

<5.1

34 JK

290



HR3B08

HR3B08-03

Rear

0.88 JQK

8.5

240 JK

0.35 JQK

2.0

46

7.1

51

370

0.21 JK

0.43 JQK

18

<5.0

<2.5

0.68 JQK

34 JK

430



HR3C01

HR3C01-01

Front

0.95 JQK

3.0

130 JK

<0.78

0.59 JQK

24

10

34 JK

130 JK

0.18

0.87 JQK

28 JK

<3.9

<2.0

<3.9

39 JK

160



HR3C01

HR3C01-02

Rear

1 A JQK

3.9

130 JK

<0.74

1.1

24

9.4

46 JK

160 JK

0.35

0.92 JQK

18 JK

<3.7

<1.9

<3.7

39 JK

260



HR3C01

HR3C01-03

Rear

16 JQK

2.2

110 JK

<0.57

1.7

18

9.3

33 JK

83 JK

0.12

0.46 JQK

13 JK

<2.9

<1.4

<2.9

37 JK

180



HR3C01

HR3C01-03(D)

Rear

0.68 JQK

2.6 JQK

130 JK

<1.0

0.35 JQK

19

9.5 JK

36 JK

97 JK

0.10 JK

0.56 JQK

15 JK

<5.0

<2.5

<5.0

36 JK

200 JK



HR3C02

HR3C02-01

Front

0.63 JQK

4.2

96

<0.94

0.87 JQK

17

8.1

25

72

0.12 JK

0.41 JQK

17

<4.7

<2.3

1.2 JQK

38 JK

200



HR3C02

HR3C02-01(D|

Front

0.69 JQK

3.8

94

0.31 JQK

0.85 JQK

16

6.1

26

78 JK

0.10 JK

0.48 JQK

24

<5.4

<2.7

<5.4

32

200



HR3C02

HR3C02-02

Rear

0.69 JQK

2.5 JQK

120

<0.99

0.98 JQK

24

10

34

110

0.29 JK

0.52 JQK

22

<4.9

<2.5

10 JQK

44 JK

210



HR3C02

HR3C02-03

Rear

1.1 JQK

5.1

130

<0.93

1.4

25

9.5

34

180

0.19 JK

0.55 JQK

14

<4.6

<2.3

14 JQK

40 JK

290



HR3C03

HR3C03-01

Front

1 A JQK

2.5 JQK

120 JK

0.33 JQK

0.62 JQK

35

6.3

24

88

0.11 JK

0.40 JQK

13

<5.2

<2.6

0.72 JQK

31 JK

160



HR3C03

HR3C03-02

Rear

5.1

4.7

210 JK

0.34 JQK

0.57 JQK

53

6.7

43

280

0.42 JK

1.0 JQK

20

<4.9

<2.5

1.2 JQK

34 JK

210



HR3C03

HR3C03-03

Rear

1 q JQK

4.1

150 JK

0.38 JQK

1.9

20

7.7

37

110

0.14 JK

0.52 JQK

15

<4.4

<2.2

0.84 JQK

32 JK

460



HR3C03

HR3C03-03|D)

Rear

0.92 JQK

3.8

150

0.43 JQK

2.1

21

7.9

38

110 JK

0.19 JK

0.62 JQK

16

<4.8

<2.4

1.5 JQK

34

460

RZ-3c

HR3C04

HR3C04-01

Front

0.80 JQK

2.5 JQK

110

0.32 JQK

1.3

21

6.0

30

97 JK

0.13 JK

0.54 JQK

16

<4.6

<2.3

0.89 JQK

29

160



HR3C04

HR3C04-02

Rear

0.76 JQK

8.7

140

0.40 JQK

1.1

19

7.3

33

120 JK

0.096 JK

0.81 JQK

16

<4.8

<2.4

0.81 JQK

33

240



HR3C04

HR3C04-03

Rear

0.76 JQK

3.5

120

0.32 JQK

1.5

18

6.2

29

110 JK

0.14 JK

0.72 JQK

17

<4.8

<2.4

0.57 JQK

29

210



HR3C05

HR3C05-01

Front

0.80 JQK

3.2

150 JK

<1.0

0.84 JQK

22

9.1

34 JK

170

0.18

0.66 JQK

15

<5.0

<2.5

<5.0

35 JK

250



HR3C05

HR3C05-02

Rear

0.57 JQK

2.7 JQK

200 JK

<1.1

1.2

21

7.8

30 JK

330

1.2

0.72 JQK

13

<5.3

<2.6

<5.3

29 JK

360



HR3C05

HR3C05-03

Rear

0.85 JQK

2.5 JQK

140 JK

<1.0

0.77 JQK

19

8.5

27 JK

140

0.20

0.51 JQK

14

<5.0

<2.5

<5.0

32 JK

200



HR3C05

HR3C05-03(D|

Rear

0.70 JQK

2.3 JQK

130

<1.1

0.71 JQK

19

9.0

28

140

0.20

0.58 JQK

19

<5.4

<2.7

<5.4

31

200



HR3C07

HR3C07-01

Front

0.36 JQK

2.6

97 JK

<0.69

0.70

18

8.5

27 JK

44

0.093 JK

0.62 JQK

17

<3.5

<1.7

12 JQK

35 JK

110



HR3C07

HR3C07-02

Front

0.48 JQK

3.1

110 JK

<0.67

0.78

20

9.5

30 JK

44

0.13 JK

0.77 JQK

16

<3.3

<1.7

1.3 JQK

41 JK

110



HR3C07

HR3C07-03

Front

0.32 JQK

2.9

94 JK

<0.67

0.69

17

8.3

26 JK

44

0.088 JK

0.50 JQK

23

<3.3

<1.7

12 JQK

35 JK

100



HR3C08

HR3C08-01

Front

0.71 JQK

2.9

130

<0.71

1.1

22

9.2

35

98

0.20 JK

0.82 JQK

16

<3.6

<1.8

1.4 JQK

37 JK

200



HR3C08

HR3C08-02

Front

0.94 JQK

2.9

120

<0.85

1.3

22

9.5

35

130

0.16 JK

0.83 JQK

17

<4.3

<2.1

1.9 JQK

38 JK

230



HR3C08

HR3C08-03

Rear

1.5 JQK

4.4

330

<0.74

2.1

21

8.2

58

310

0.37 JK

0.96 JQK

16

<3.7

0.54 JQK

2.1 JQK

33 JK

470

T-10 (4 of 6)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Sub-RZ

Property

Sample No.

Yard

Analyte

Antimony

Arsenic

Barium

Beryllium

Cadmium

Chromium

Cobalt

Copper

Lead

Mercury

Mo

Nickel

Selenium

Silver

Thallium

Vanadium

Zinc

HRS Soil Screening Benchmark(1)

5.9

22

459

1.3

3.1

65

26

142

401

0.53

3.3

84

9.2

4.7

3.9

107

630





Residential RSL

31

0.68

15,000

160

7.1

„<2>

23

3,100

400

11

390

1,500

390

390

0.78

390

23,000

RZ-4a

HR4A01

HR4A01-01

Front

0.49 JQK

2.0 JQK

92

<1.1

0.29 JQK

12

5.8

25

59

0.079 JK

0.35 JQK

10

<5.3

<2.6

<5.3

24

160

HR4A01

HR4A01-02

Rear

4.5 JK

2 Q JQK

120

<1.0

0.69 JQK

13

5.4

33

120

0.091 JK

0.84 JQK

11

<5.1

<2.5

<5.1

22

270

HR4A01

HR4A01-03

Rear

0.99 JQK

-| J JQK

120

<1.0

0.49 JQK

11

4.3

37

120

0.057 JK

0.74 JQK

8.5

<5.2

<2.6

<5.2

19

210

HR4A02

HR4A02-01

Front

1.0 JQK

3.5

150

<0.96

0.19 JQK

22

11

27

76 JK

0.056 JK

0.80 JQK

25 JK

<4.8

<2.4

<4.8

42

170

HR4A02

HR4A02-02

Front

1.1 JQK

3.3

120

<0.99

0.40 JQK

18

7.9

24

92 JK

0.055 JK

0.71 JQK

17 JK

<5.0

<2.5

<5.0

32

210

HR4A02

HR4A02-02|D)

Front

1.0 JQK

3.1

130

<0.91

0.42 JQK

18

8.1

23

90 JK

0.053 JK

0.46 JQK

15 JK

<4.5

<2.3

<4.5

32

210

HR4A02

HR4A02-03

Front

1.3 JQK

3.9

120

<0.93

0.24 JQK

19

9.1

22

97 JK

0.043 JK

0.42 JQK

14 JK

<4.6

<2.3

<4.6

37

200

HR4A03

HR4A03-01

Front

0.42 JQK

4.4

130 JK

<1.0

0.72 JQK

18

6.1

30

72

0.093 JH

0.83 JQK

14

<5.2

<2.6

<5.2

28

180

HR4A03

HR4A03-02

Front

0.89 JQK

5.8

140 JK

<0.99

0.69 JQK

17

6.3

26

95

0.16 JH

0.56 JQK

13

<5.0

<2.5

<5.0

29

190

HR4A03

HR4A03-03

Rear

3.4

3.9

190 JK

<1.0

1.7 JK

22

7.0

50

280

0.10 JH

0.73 JQK

19

<5.0

<2.5

<5.0

36

430

HR4A04

HR4A04-01

Front

0.51 JQK

7.4

100 JK

<0.96

0.53 JQK

26

8.1

29

38

0.093 JH

1.6 JQK

23

<4.8

<2.4

<4.8

44

130

HR4A04

HR4A04-02

Rear

1.6 JQK

7.7

150 JK

<1.0

0.53 JQK

29

12

470

180

0.14 JH

0.86 JQK

20

<5.0

3.3

<5.0

51

310

HR4A04

HR4A04-03

Rear

0.92 JQK

8.1

150 JK

<0.94

0.75 JQK

30

14

40

100

0.17 JH

1.3 JQK

33

<4.7

<2.4

<4.7

51

180

HR4A06

HR4A06-01

Front

0.50 JQK

4.5

110 JK

<0.71

0.74

18

8.9

32 JK

95 JK

0.072

0.72 JQK

19 JK

<3.6

<1.8

<3.6

35 JK

220

HR4A06

HR4A06-01(D|

Front

0.28 JQK

5.1 JK

120 JK

<1.0

0.51 JQK

18

8.5 JK

29 JK

86 JK

0.096 JK

0.62 JQK

15 JK

<5.1

<2.5

<5.1

33 JK

220 JK

HR4A06

HR4A06-02

Front

-j Q JQK

7.2

110 JK

<0.70

0.95

19

9.2

32 JK

110 JK

0.084

0.74 JQK

22 JK

<3.5

<1.7

<3.5

35 JK

220

HR4A06

HR4A06-03

Rear

-| -| JQK

4.1

150 JK

<0.58

1.4

20

8.5

44 jk

140 JK

0.19

0.77 JQK

20 JK

<2.9

<1.4

<2.9

34 JK

320

HR4A07

HR4A07-01

Front

0.59 JQK

2.5 JQK

120

<1.1

0.66 JQK

19

6.1

27

110 JK

0.16 JK

0.43 JQK

H JK

<5.7

<2.9

<5.7

28

180

HR4A07

HR4A07-02

Front

0.58 JQK

2.1 JQK

120

<1.1

1.2

21

5.8

23

130 JK

0.20 JK

0.28 JQK

10 JK

<5.5

0.94 JQK

<5.5

26

180

HR4A07

HR4A07-03

Front

0.54 JQK

2.5 JQK

140

<1.2

0.99 JQK

30

7.4

30

140 JK

0.13 JK

2.0 JQK

19 JK

<5.8

1.0 JQK

<5.8

33

190

HR4A08

HR4A08-01

Front

0.40 JQK

6.5

120

<0.94

0.61 JQK

15

8.1

30

140

0.088 JK

0.71 JQK

16

<4.7

<2.4

<4.7

28

430

HR4A08

HR4A08-01(D|

Front

0.54 JQK

6.4

130

<1.0

0.65 JQK

16

8.3

32

130

0.11 JK

0.81 JQK

17

<5.1

<2.6

<5.1

29

430

HR4A08

HR4A08-02

Front

0.72 JQK

4.0

140

<1.0

0.46 JQK

20

7.8

28

140

0.092 JK

0.56 JQK

15

<5.1

<2.6

<5.1

26

220

HR4A08

HR4A08-03

Front

0.62 JQK

3.6

120

<0.90

0.42 JQK

14

7.1

31

130

0.10 JK

0.66 JQK

22

<4.5

<2.3

<4.5

26

200

RZ-4b

HR4B01

HR4B01-01

Front

0.80 JQK

4.1

160

<1.2

0.61 JQK

22

10

37

140 JK

0.13 JK

0.78 JQK

19 JK

<6.0

<3.0

<6.0

38

230

HR4B01

HR4B01-02

Side

1.3 JQK

5.6

190

<0.98

1.0

24

12

44

160 JK

0.11 JK

1.3 JQK

21 JK

<4.9

<2.4

<4.9

44

440

HR4B01

HR4B01-03

Side

1.4 JQK

4.6

180

<1.0

0.85 JQK

23

10

48

150 JK

0.15 JK

1.4 JQK

22 JK

<5.0

<2.5

<5.0

39

340

HR4B02

HR4B02-01

Front

0.80 JQK

3.6

150

<1.0

0.69 JQK

20

7.0

39

140 JK

0.19 JK

0.86 JQK

17 JK

<5.2

0.79 JQK

<5.2

28

260

HR4B02

HR4B02-01(D|

Front

1.1 JQK

4.3

170

<0.99

0.86 JQK

20

7.8

44

170 JK

0.21 JK

0.81 JQK

19 JK

<5.0

0.59 JQK

<5.0

30

290

HR4B02

HR4B02-02

Rear

-j g JQK

3.4

350

<0.97

1.0

21

8.2

49

320 JK

0.16 JK

0.83 JQK

16 JK

<4.9

<2.4

<4.9

31

440

HR4B02

HR4B02-03

Rear

2 y JQK

3.5

380

<0.97

1.7

23

8.9

54

560 JK

0.16 JK

0.99 JQK

17 JK

<4.8

<2.4

<4.8

33

660

HR4B03

HR4B03-01

Front

0.93 JQK

4.4

120 JK

<1.1

2.8 JK

20

9.6

28

73

0.11 JH

0.66 JQK

18

<5.5

<2.8

<5.5

36

260

HR4B03

HR4B03-02

Rear

25

6.1

140 JK

<0.96

1.1 JK

20

9.8

33

960

0.15 JH

0.54 JQK

20

<4.8

<2.4

<4.8

37

280

HR4B03

HR4B03-03

Front

0.92 JQK

4.8

150 JK

<0.98

0.70 JQK

25

11

33

74

0.14 JH

0.81 JQK

19

<4.9

<2.4

<4.9

41

190

HR4B04

HR4B04-01

Front

1.8 JQK

4.1

180 JK

<0.96

1.5

24

11

59 JK

160 JK

0.14

1.3 JQK

28 JK

<4.8

<2.4

<4.8

39 JK

410

HR4B04

HR4B04-02

Rear

5.5

6.2

300 JK

<0.59

2.3

35

13

93 JK

300 JK

0.20

3.1

30 JK

<3.0

0.73 JQK

<3.0

43 JK

570

HR4B04

HR4B04-03

Rear

4.6

5.3

310 JK

<0.93

2.3

38

13

77 JK

290 JK

0.22

1 2 JQK

25 JK

<4.6

<2.3

<4.6

48 JK

570

HR4B04

HR4B04-03(D|

Rear

4.5 JK

4.7 JK

320 JK

<1.1

1.8

30

13 JK

69 JK

250 JK

0.21 JK

-j 2 JQK

24 JK

<5.4

<2.7

<5.4

46 JK

570 JK

HR4B05

HR4B05-01

Front

0.49 JQK

3.9

130 JK

<1.0

0.63 JQK

21

11

35 JK

59 JK

0.10

1.1 JQK

21 JK

<5.1

<2.6

<5.1

44 jk

240

HR4B05

HR4B05-02

Rear

2.5

5.1

210 JK

<0.66

2.2

32

11

87 JK

140 JK

0.13

1.0 JQK

29 JK

<3.3

<1.7

<3.3

42 J*

340

HR4B05

HR4B05-03

Rear

2.1 JQK

6.4

390 JK

<0.99

0.96 JQK

25

9.6

190 JK

300 JK

0.23

1.6 JQK

23 JK

<5.0

<2.5

<5.0

36 JK

660

HR4B06

HR4B06-01

Front

0.87 JQK

3.6

130

<1.0

0.49 JQK

16

7.1

28

98 JK

0.10 JK

0.41 JQK

-J -J JK

<5.1

<2.6

<5.1

29

170

HR4B06

HR4B06-01(D|

Front

0.30 JQK

3.2

110

<1.1

0.57 JQK

14

6.9

26

87

0.11 JK

0.40 JQK

12

<5.3

<2.7

<5.3

26

160

HR4B06

HR4B06-02

Rear

0.88 JQK

4.4

180

<0.89

1.2

19

8.6

57

130 JK

0.092 JK

0.84 JQK

15 JK

<4.5

<2.2

<4.5

34

230

HR4B06

HR4B06-03

Rear

0.27 JQK

3.6

1.300

<0.95

1.3

23

11

49

65 JK

0.15 JK

0.86 JQK

18 JK

<4.8

<2.4

<4.8

42

190



HR4C01

HR4C01-01

Front

1.3 JQK

6.3

350 JK

<0.92

1.0

33

12

59 JK

210

0.17

1.4 JQK

37

<4.6

<2.3

<4.6

46 JK

320

HR4C01

HR4C01-02

Rear

1.2 JQK

4.7

230 JK

<0.98

0.48 JQK

27

13

200 JK

150

0.33

0.61 JQK

26

<4.9

<2.4

<4.9

49 JK

270

HR4C01

HR4C01-03

Rear

0.98 JQK

4.3

200 JK

<1.0

0.40 JQK

25

12

45 JK

98

0.18

0.74 JQK

27

<5.1

<2.5

<5.1

44 jk

270

HR4C02

HR4C02-01

Rear

2 JQK

7.0

150 JK

<0.97

0.11 JQK

29

14

35

23

0.089 JH

0.63 JQK

23

<4.9

<2.4

<4.9

49

97

HR4C02

HR4C02-02

Rear

-| -| JQK

5.7

130 JK

<1.1

1 4 JK

42

11

38

100

0.12 JH

0.90 JQK

28

<5.3

<2.6

<5.3

41

130

HR4C02

HR4C02-03

Rear

2 2 JQ^

5.0

140 JK

<0.95

6.5 JK

31

11

72

130

0.15 JH

-J 4 JQK

38

<4.7

<2.4

<4.7

39

240

HR4C03

HR4C03-01

Front

2.1 JQK

3.3

180 JK

<0.74

2.4

26

14

55 JK

87 JK

0.12

1.0 JQK

25

0.39 JQK

<1.8

<3.7

48 JK

310

HR4C03

HR4C03-02

Rear

1.4 JQK

5.2

220 JK

<1.2

1.1 JQK

28

14

68 JK

120 JK

0.19

1.1 JQK

22 JK

<5.8

<2.9

<5.8

49 JK

320

HR4C03

HR4C03-03

Rear

2.4 JQK

9.3

270 JK

<0.84

3.0

32

16

65 JK

210 JK

0.25

1.2 JQK

25 JK

0.73 JQK

<2.1

<4.2

58 JK

380

1-10(5 of 6)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Sub-RZ

Property

Sample No.

Yard

Analyte

Antimony

Arsenic

Barium

Beryllium

Cadmium

Chromium

Cobalt

Copper

Lead

Mercury

Mo

Nickel

Selenium

Silver

Thallium

Vanadium

Zinc

HRS Soil Screening Benchmark(1)

5.9

22

459

1.3

3.1

65

26

142

401

0.53

3.3

84

9.2

4.7

3.9

107

630





Residential RSL

31

0.68

15,000

160

7.1

„<2>

23

3,100

400

11

390

1,500

390

390

0.78

390

23,000

RZ-4c

HR4C04

HR4C04-01

Front

0.92 JQK

30

160 JK

<1.0

0.48 JQK

24

13 JK

44 jk

74 JK

0.16 JK

1 2 JQK

22 JK

<5.1

<2.5

<5.1

46 JK

210 JK

HR4C04

HR4C04-02

Side

15 JQK

4 -J JK

250 JK

<0.96

1.3

25

10 JK

47 JK

260 JK

0.22 JK

-j Q JQK

22 JK

<4.8

<2.4

<4.8

40 JK

430 JK

HR4C04

HR4C04-03

Rear

-| j JQK

4.3 JK

200 JK

<0.91

1.5

27

9.7 JK

70 JK

200 JK

0.23 JK

1.9

27 JK

<4.5

<2.3

<4.5

36 JK

490 JK

HR4C05

HR4C05-01

Front

0.92 JQK

5.5 JK

210 JK

<0.98

0.70 JQK

31

14 JK

48 JK

130 JK

0.19 JK

0.89 JQK

36 JK

<4.9

<2.4

<4.9

51 JK

280 JK

HR4C05

HR4C05-02

Front

<3.2

19 JQK

66 JK

<1.1

<1.1

9.8

4.7 JK

17 JK

79 JK

0.12 JK

o

CO

7.9 JK

<5.3

<2.7

<5.3

23 JK

81 JK

HR4C05

HR4C05-03

Rear

0.97 JQK

6.0 JK

220 JK

<1.1

1.1

39

13 JK

58 JK

120 JK

0.35 JK

0.86 JQK

27 JK

<5.3

<2.6

<5.3

47 JK

340 JK

HR4C06

HR4C06-01

Rear

2.3 JQK

4.2

140 JK

<0.95

1.5 JK

27

12

52

110

0.13 JH

-| 4 JQK

25

<4.8

<2.4

<4.8

46

260

HR4C06

HR4C06-02

Rear

-J -J JQK

4.1

140 JK

<0.92

1.0 JK

29

13

46

100

0.097 JH

-j 0 JQK

26

<4.6

<2.3

<4.6

48

210

HR4C06

HR4C06-02(D|

Rear

0.95 JQK

4.2

170 JK

<0.94

1.2 JK

26

13

45

95

0.14 JH

1.3 JQK

28

<4.7

<2.4

<4.7

48

190

HR4C06

HR4C06-03

Front

1 1 Jul

4.7

190 JK

<0.95

1.5 JK

33

14

61

130

0.16 JH

13 JuK

33

<4.8

<2.4

<4.8

51

300

HR4C07

HR4C07-01

Front

1 6 Jf"

6.8

230 JK

<1.0

1.3 JK

32

16

50

140

0.19 JH

1 2 Jni

29

<5.1

<2.6

<5.1

56

340

HR4C07

HR4C07-02

Rear

22 jui

5.7

380 JK

<1.0

3.1 JK

35

14

84

350

0.23 JH

1 4 jui

39

<5.2

0.68 Juh

<5.2

54

420

HR4C07

HR4C07-03

Rear

1 3

6.5

220 JK

<0.98

1.7 JK

32

14

62

170

0.13 JH

14 JyK

23

<4.9

1 0 jr"

<4.9

52

410

soil exposure pathway is 'significantly above background" (see Section 3 2 1)
2 = an RSL for Total (i e , unspeciated) chromium has not been established
D = Field Duplicate Sample

L - LuvvBias

Q = The reported result is less than the SQL

RSL = EPA Regional Screening Level (May 2023, THQ =1 0, Risk = 10-6)
RZ = Residential Sampling Zone
SQL = Sample Quantitation Limit

<## = Analyte not detected at or above indicated Sample Quantitation Limit (SQL)

1-10(6 of 6)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Table 11: Stage 3 - Residential Soil Sampling Results - ISM

Sub-RZ

Sample No.

Analyte

Antimony

Arsenic

Barium

Beryllium

Cadmium

Shromiurr

Cobalt

Copper

Lead

Mercury

Mo

Nickel

Selenium

Silver

Thallium

Vanadiurr

Zinc

Residential RSL

31

0.68

15,000

160

7.1

..ft

23

3,100

400

11

390

1,500

390

390

0.78

390

23,000

RZ-1a

IR1A-01

1 4 JQK

6.6

210

0.58 JQK

1.6 JQK

27

9.6

57

190

0.16

1 -J JQK

45

<9.6

<4.8

4.7 JQK

40

350

RZ-1b

IR1B-01

1 1 JQK

6.1

180

0.40 JQK

7 JQK

27

7.3

45

190

0.23

0.85 JQK

20

<9.4

<4.7

2 g JQK

31

300

RZ-1b

IR1B-02

0.93 JQK

6.6

190

0.46 JQK

1.6 JQK

27

7.5

47

170

0.18

0.77 JQK

24

<9.5

<4.7

3.9 JQK

35

300

RZ-1b

IR1B-03

1 4 JQK

6.9

170

0.45 JQK

7 JQK

30

7.4

46

180

0.27

0.72 JQK

24

<9.3

<4.7

4 1 JQK

33

290

RZ-1b

IR1B-AV(2)

1 -J JQK

6.5

180

0.44 JQK

-| 7 JQK

28

7.4

46

180

0.23

0.78 JQK

23

<9.5

<4.7

3.6 JQK

33

297

RZ-1c

IR1C-01

1 2 J°K

4.6 JQK

150

0.45 JQK

-j g JQK

22

7.5

51

240

0.16

0.88 JQK

27

<9.3

<4.6

3.0 JQK

34

270

RZ-2a

IR2A-01

0.56 JQK

4 -| JQK

150

0.34 JQK

1.3 JQK

23

6.3

35

220

0.55 JK

0.74 JQK

14 JK

<9.4

<4.7

2.8 JQK

29

300

RZ-2a

IR2A-02

1 2 J°K

5.2 JQK

200

0.39 JQK

1 5 JQK

30

6.3

37

220

0.25 JK

1 1 JQK

29 JK

<9.4

<4.7

3.0 JQK

32

320

RZ-2a

IR2A-03

1 -J JQK

4.3 JQK

150

0.35 JQK

1.3 JQK

26

6.0

37

290

0.26 JK

0.87 JQK

15 JK

<9.4

<4.7

3.0 JQK

29

300

RZ-2a

IR2A-AV(2)

0.95 JQK

4 5 jqk

167

0.36 JQK

1 4 JQK

26

6.2

36

243

0.35 JK

0.90 JQK

19 JK

<9.4

<4.7

2 g JQK

30

307

RZ-2b

IR2B-01

0.56 JQK

3.7 JQK

150

0.38 JQK

-j ^ JQK

18

5.8

34

150

0.25

0.54 JQK

13

<9.6

<4.8

3.0 JQK

33

260

RZ-2c

IR2C-01

0.76 JQK

5.7

140

0.37 JQK

g JQK

22

6.4

40

170

0.31

0.61 JQK

19

<9.3

<4.6

3.8 JQK

32

250

RZ-3a

IR3A-01

0.62 JQK

4.7 JQK

130

0.34 JQK

0.87 JQK

21

5.9

32

170

0.26

0.60 JQK

20

<9.3

<4.7

2.9 JQK

31

230

RZ-3b

IR3B-01

0.63 JQK

4.2 JQK

170

0.40 JQK

2 JQK

27

6.5

37

180

0.18

0.67 JQK

16

<9.3

<4.7

3.7 JQK

36

280

RZ-3c

IR3C-01

0.76 JQK

2.8 JQK

130

0.35 JQK

Q JQK

19

6.4

35

140

0.16

0.63 JQK

16

<9.5

<4.7

3.2 JQK

32

220

RZ-3c

IR3C-02

0.76 JQK

3.4 JQK

130

0.38 JQK

j q JQK

19

6.6

37

120

0.17

0.52 JQK

19

<9.5

<4.7

3.0 JQK

32

240

RZ-3c

IR3C-03

0.95 JQK

3.7 JQK

130

0.36 JQK

j j JQK

19

6.6

38

180

0.17

0.67 JQK

17

<9.3

<4.7

3.0 JQK

33

220

RZ-3c

IR3C-AV®

0.82 JQK

3.3 JQK

130

0.36 JQK

-j q JQK

19

6.5

37

147

0.17

0.61 JQK

17

<9.5

<4.7

3 1 JQK

32

227

RZ-4a

IR4A-01

0.67 JQK

3.6 JQK

130

0.34 JQK

0.97 JQK

16

5.7

34

150

0.09

0.82 JQK

14

<9.3

<4.7

2.4 JQK

29

230

RZ-4b

IR4B-01

-| g JQK

3.8 JQK

280

0.43 JQK

j g JQK

20

7.3

55

220

0.16

0.89 JQK

17

<9.5

<4.8

4 4 JQK

34

360

RZ-4c

IR4C-01

1 g JQK

5.5

220

0.73 JQK

q JQK

27

10

61

170

0.23

1 4 JQK

33

<9.2

<4.6

5 4 jqk

42

380

Notes:











Qualifier Definit

ons:











Definitions:











all values are reported In mg/kg
Samples collected in August 2022

1	= an RSL for Total (i.e., unspeciated) chromium has not been established.

2	= "-AV" Result is Arithmetic Mean of Primary (-01), Duplicate (-02), and Triplicate (-03) Sample Results

H = High Bias

J = The result is an estimated quantity
K = Unknown Bias
L = Low Bias

Q = The reported result is less than the SQL









ISM = Incremental Sampling Methodology
mg/kg = milligram per kilogram
MO = Molybdenum

RSL = EPA Regional Screening Level (May 2023; THQ =1.0, Risk = 10-6)
RZ = Residential Sampling Zone
SQL = Sample Quantitation Limit

<## = Analyte not detected at or above indicated Sample Quantitation Limit (SQL)



T-11 (1 of 1)


-------
Central Metal SI Report
CAN0090332

September 2023
TABLES

Table 12: Stage 3 - Residential Soil Sampling - Lead Results Summary

Residential
Zone

Residential
Subzone'2'

Residential Shallow Soil Sample Results & Locations<1>
(F = Front Yard; R = Rear Yard; S = Side Yard)

Assigned Subzone Property No:

01

02

03

04

05

06

07

08

09

10

Property Sample No:

-01

-02

03

-01

-02

03

-01

-02

03

-01

-02

03

-01

-02

03

-01

-02

03

-01

-02

03

-01

-02

03

-01

-02

03

-01

-02

03

RZ-1
(Walnut
Park)

RZ-1 a
(HR1A)

140

150

110

89

170

270

140

380

720

150

130

140

180

210

270

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

F

F

F

F

R

R

F

R

R

F

R

R

R

R

R

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

RZ-1b
(HR1B)

75

280

310

170

230

190

140

240

200

110

67

75

210

180

200

170

67

100

140

130

150

180

270

200

86

150

140

78

110

240

F

R

R

F

R

R

F

R

R

F

F

F

F

F

R

R

F

F

F

R

R

F

R

R

F

R

R

F

R

R

RZ-1c
(HR1C)

150

430

200

120

110

150

170

170

130

250

230

260

270

750

290

120

150

170

250

180

190

-

-

-

-

-

-

-

-

-

F

R

R

F

F

F

F

R

R

F

R

R

F

R

R

F

F

F

F

R

R

--

-

-

--

-

-

--

-

-

RZ-2
(Walnut
Park)

RZ-2a
(HR2A)

910

740

440

140

210

310

76

77

96

750

270

170

150

160

410

160

120

300

49

48

360

-

-

-

-

-

-

-

-

-

R

R

F

F

R

R

F

F

R

F

R

R

F

F

R

F

F

R

F

F

R

--

-

-

--

-

-

--

-

-

RZ-2b
(HR2B)

110

190

190

140

160

92

140

150

200

180

160

210

130

150

240

250

240

76

69

75

380

-

-

-

-

-

-

-

-

-

F

R

R

F

R

R

F

R

R

F

R

R

F

R

R

R

R

F

F

F

R

--

-

-

--

-

-

--

-

-

RZ-2c
(HR2C)

84

180

150

250

190

140

120

89

130

85

130

130

130

120

120

120

550

430

230

760

98

-

-

-

-

-

-

-

-

-

F

R

R

F

F

F

F

R

R

F

R

R

F

R

R

F

R

R

F

R

R

--

-

-

--

-

-

--

-

-

RZ-3
(Walnut
Park)

RZ-3a
(HR3A)

84

90

93

290

310

150

110

530

720

96

130

110

140

140

78

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

S

R

F

R

s

F

F

R

R

R

R

F

R

F

F

--

-

-

-

-

-

--

-

-

--

-

-

--

-

-

RZ-3b
(HR3B)

95

290

200

110

150

180

64

84

160

100

140

120

130

850

330

95

270

180

92

200

210

160

280

370

-

-

-

-

-

-

F

R

R

F

R

R

F

R

R

F

R

R

F

R

R

F

R

R

F

R

F

F

R

R

--

-

-

--

-

-

RZ-3c
(HR3C)

130

160

97

78

110

180

88

280

110

97

120

110

170

330

140

-

-

-

44

44

44

98

130

310

-

-

-

-

-

-

F

R

R

F

R

R

F

R

R

F

R

R

F

R

R

--

-

-

F

F

F

F

F

R

--

-

-

--

-

-

RZ-4
(Florence-
Firestone)

RZ-4a
(HR4A)

59

120

120

76

92

97

72

95

280

38

180

100

-

-

-

95

110

140

7 70

730

140

140

140

130













F

R

R

F

F

F

F

F

R

F

R

R

--

-

-

F

F

R

F

F

F

F

F

F

--

-

-

--

-

-

RZ-4b
(HR4B)

140

160

150

170

320

560

73

960

74

760

300

290

59

140

300

98

130

65

-

-

-

-

-

-

-

-

-

-

-

-

F

s

s

F

R

R

F

R

F

F

R

R

F

R

R

F

R

R

--

--

-

--

--

--

--

-

-

--

-

-

RZ-4c
(HR4C)

210

150

98

23

100

130

87

120

270

74

260

200

730

79

120

110

100

130

140

350

170

-

-

-

-

-

-

-

-

-

F

R

R

R

R

R

F

R

R

F

s

R

F

F

R

R

R

F

F

R

R

--

--

--

--

-

-

--

-

-

Notes:

All values are reported In mg/kg

Bold & Underlined values Indicate results that exceed the lead HRS Soil Screenlna Benchmark of 401 ma/ka (see Section 3.2.1.31

Italic values Indicate results are estimated (I.e., J-flagged)

For duplicate samplest, only the greater of the two values Is presented.

Samples collected In August 2022

1	= Presented values are from the Four-Point Composite sample dataset. Incremental Sample Methodology (ISM) results are provided In Table 11

2	= Text in parentheses is the subzone sample code (e.g., HR1A indicates subzone RZ-1a in sample ID No. HR1A02-03; with "02" indicating the 2nd property within that

subzone and "-03" indicating the third sample from that property)

Definitions:
mg/kg = milligrams per kilogram
-- = Not Applicable

T-12 (1 of 1)


-------
Central Metal SI Report
CAN0090332

September 2023
TABLES

Table 13: Stage 3 - Residential Soil Sampling - Arsenic Results Summary

Residential
Zone

Residential
Subzone'2'

Residential Shallow Soil Sample Results & Locations<1>
(F = Front Yard; R = Rear Yard; S = Side Yard)

Assigned Subzone Property No:

01

02

03

04

05

06

07

08

09

10

Property Sample No:

-01

-02

03

-01

-02

03

-01

-02

03

-01

-02

03

-01

-02

03

-01

-02

03

-01

-02

03

-01

-02

03

-01

-02

03

-01

-02

03

RZ-1
(Walnut
Park)

RZ-1 a
(HR1A)

9.1

19

10

4.4

9.5

9.8

5.8

5.0

4.4

6.3

7.1

7.7

4.7

5.1

5.3

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

F

F

F

F

R

R

F

R

R

F

R

R

R

R

R

--

--

--

--

--

--

--

--

--

--

--

--

--

--

--

RZ-1b
(HR1B)

2.9

3.3

5.0

4.3

4.7

7.5

7.2

4.8

5.2

51

64

29

6.1

5.1

4.9

4.7

2.3

2.6

9.9

8.7

13

2.3

5.2

4.2

5.0

4.3

7.5

3.2

5.5

6.9

F

R

R

F

R

R

F

R

R

F

F

F

F

F

R

R

F

F

F

R

R

F

R

R

F

R

R

F

R

R

RZ-1c
(HR1C)

7.6

8.3

5.9

5.1

3.9

6.3

5.5

5.9

5.1

5.5

5.8

7.2

4.1

5.3

3.4

3.4

4.4

4.4

5.7

4.9

4.8

-

-

-

-

-

-

-

-

-

F

R

R

F

F

F

F

R

R

F

R

R

F

R

R

F

F

F

F

R

R

--

-

-

--

-

-

--

-

-

RZ-2
(Walnut
Park)

RZ-2a
(HR2A)

6.1

6.3

7.6

4.2

12

10

3.3

3.2

5.1

3.0

3.2

3.0

4.1

3.8

4.9

2.7

2.3

4.2

19

2.7

8.7



















R

R

F

F

R

R

F

F

R

F

R

R

F

F

R

F

F

R

F

F

R

--

-

-

--

-

-

--

-

-

RZ-2b
(HR2B)

2.5

2.7

3.1

3.1

2.9

3.3

4.4

2.4

3.8

5.3

4.9

5.1

3.0

3.3

3.6

2.8

3.0

3.1

2.5

2.8

6.5

-

-

-

-

-

-

-

-

-

F

R

R

F

R

R

F

R

R

F

R

R

F

R

R

R

R

F

F

F

R

--

-

-

--

-

-

--

-

-

RZ-2c
(HR2C)

3.9

12

16

9.6

9.5

4.2

3.3

3.5

3.1

2.5

3.8

3.1

13

23

3.4

2.6

7.1

6.0

9.1

9.0

7.5

-

-

-

-

-

-

-

-

-

F

R

R

F

F

F

F

R

R

F

R

R

F

R

R

F

R

R

F

R

R

--

-

-

--

-

-

--

-

-

RZ-3
(Walnut
Park)

RZ-3a
(HR3A)

4.9

6.1

6.2

7.9

11

4.8

3.2

4.5

4.9

4.6

4.2

3.4

5.0

4.0

2.3

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

S

R

F

R

S

F

F

R

R

R

R

F

R

F

F

-

-

-

--

-

-

--

-

-

--

-

-

--

-

-

RZ-3b
(HR3B)

2.5

7.3

4.9

3.6

2.7

3.5

2.9

2.9

3.0

3.2

5.0

4.0

3.1

5.5

3.3

2.3

2.8

2.1

5.5

4.9

3.5

5.2

6.3

8.5













F

R

R

F

R

R

F

R

R

F

R

R

F

R

R

F

R

R

F

R

F

F

R

R

--

-

-

--

-

-

RZ-3c
(HR3C)

3.0

3.9

2.6

4.2

2.5

5.1

2.5

4.7

4.1

2.5

8.7

3.5

3.2

2.7

2.5

-

-

-

2.6

3.1

2.9

2.9

2.9

4.4

-

-

-

-

-

-

F

R

R

F

R

R

F

R

R

F

R

R

F

R

R

--

-

-

F

F

F

F

F

R

--

-

-

--

-

-

RZ-4
(Florence-
Firestone)

RZ-4a
(HR4A)

2.0

2.0

1.7

3.5

3.3

3.9

4.4

5.8

3.9

7.4

7.7

8.1

-

-

-

5.7

7.2

4.1

2.5

2.7

2.5

6.5

4.0

3.6

-

-

-

-

-

-

F

R

R

F

F

F

F

F

R

F

R

R

--

-

-

F

F

R

F

F

F

F

F

F

--

-

-

--

-

-

RZ-4b
(HR4B)

4.1

5.6

4.6

4.3

3.4

3.5

4.4

6.1

4.8

4.1

6.2

5.3

3.9

5.1

6.4

3.6

4.4

3.6

-

-

-

-

-

-

-

-

-

-

-

-

F

s

s

F

R

R

F

R

F

F

R

R

F

R

R

F

R

R

--

--

--

--

--

--

--

-

-

--

-

-

RZ-4c
(HR4C)

6.3

4.7

4.3

7.0

5.7

5.0

3.3

5.2

9.3

30

4.1

4.3

5.5

1.9

6.0

4.2

4.2

4.7

6.8

5.7

6.5

-

-

-

-

-

-

-

-

-

F

R

R

R

R

R

F

R

R

F

s

R

F

F

R

R

R

F

F

R

R

--

--

--

--

-

-

--

-

-

Notes:

All values are reported In mg/kg

Bold & Underlined values Indicate results that exceed the lead HRS Soil Screenlna Benchmark of 401 ma/ka (see Section 3.2.1.31

Italic values Indicate results are estimated (I.e., J-flagged)

For duplicate samplest, only the greater of the two values Is presented.

Samples collected In August 2022

1	= Presented values are from the Four-Point Composite sample dataset. Incremental Sample Methodology (ISM) results are provided In Table 11

2	= Text in parentheses is the subzone sample code (e.g., HR1A indicates subzone RZ-1a in sample ID No. HR1A02-03; with "02" indicating the 2nd property within that

subzone and "-03" indicating the third sample from that property)

Definitions:
mg/kg = milligrams per kilogram
-- = Not Applicable

T-13 (1 of 1)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Table 14: Stage 3 - Background Soil Sampling Results

Sample
Type

sub-BZ

Sample No.

Analyte

Antimony | Arsenic

Barium | Beryllium

Cadmium | Chromium

Cobalt | Copper

Lead | Mercury

Mo | Nickel

Selenium | Silver

Thallium | Vanadium

Zinc

Residential RSL

31 | 0.68

15,000 | 160

7.1 | -l1'

23 | 3,100

400 | 11

390 | 1,500

390 | 390

0.78 | 390

23,000

Franklin D. Roosevelt Park (BZ-1)

4-Point Comp.

BZ-1 A

HB1A-01

0.35 JQK

4.4

130

0.89 JQK

0.36 JQK

20

9.1

30

39

0.16

0.64 JQK

62 JK

<4.9

<2.5

3.3 JQK

45

110

BZ-1 A

HB1A-02

<2.3

3.7

120

0.83

0.32 JQK

17

8.3

28

22

0.064

0.69 JQK

55 JK

<3.9

<1.9

3.0 JQK

42

82

BZ-1 A

HB1A-03

0.99 JQK

4.7

180

0.88 JQK

0.90

22

9.2

56

120

0.17

0.99 JQK

34 JK

<4.5

<2.2

3.5 JQK

43

310

BZ-1 A

HB1A-04

1.9 JQK

5.3

150

0.84 JQK

0.87 JQK

23

8.9

50

160

0.10

0.99 JQK

75 JK

<4.9

<2.5

3.5 JQK

43

250

BZ-1 A

HB1A-05

0.46 JQK

4.0

120

0.74 JQK

0.36 JQK

17

7.6

26

33

0.071

1.0 JQK

20 JK

<4.7

<2.4

2.7 JQK

38

100

BZ-1 A

HB1A-05(D|

0.48 JQK

4.0

110

0.65 JQK

0.36 JQK

16

7.1

25

32

0.084

0.98 JQK

19 JK

<3.7

<1.9

2 4 jqk

35

94

ISM

BZ-1 A

IB1A-01

0.89 JQK

4.3 JQK

140 JK

0.60 JQK

0.49 JQK

19

8.7

37

66 JK

0.15

0.90 JQK

45 JK

<9.6

<4.8

2 Q JQK

37

180 JK

BZ-1 A

IB1A-02

13 JQK

3.6 JQK

120 JK

0.55 JQK

0.56 JQK

17

8.1

37

71 JK

0.15

0.74 JQK

31 JK

<9.2

<4.6

1 g JQK

37

170 JK

BZ-1 A

IB1A-03

0.73 JQK

4 5 JQK

150 JK

0.58 JQK

0.52 JQK

20

8.3

39

89 JK

0.17

0.83 JQK

30 JK

<9.9

<4.9

1 5 JQK

38

210 JK

BZ-1 A

IB1A-AV121

0.97 JQK

4 -| JQK

137 JK

0.58 JQK

0.52 JQK

19

8.4

38

75 JK

0.16

0.82 JQK

35 JK

<9.9

<4.9

1 g JQK

37

187 JK

4-Point Comp.

BZ-1 B

HB1B-01

0.70 JQK

4.2

120

0.71 JQK

0.47 JQK

18

7.3

43

56

0.13

0.84 JQK

44 JK

<5.0

<2.5

2.6 JQK

38

150

BZ-1 B

HB1B-02

1 4

6.1

180

0.91 JQK

1.5

25

9.8

61

270

0.19

1 4 JQK

46 JK

<4.8

<2.4

3.6 JQK

48

340

BZ-1 B

HB1B-03

0.62 JQK

4.6

140

0.80 JQK

0.56 JQK

19

8.1

34

60

0.17

1.0 JQK

21 JK

<4.6

<2.3

2.7 JQK

42

160

BZ-1 B

HB1B-04

0.25 JQK

3.5

100

0.73

0.30 JQK

16

7.2

34

29

0.093

0.70 JQK

48 JK

<3.3

<1.7

2.2 JQK

37

86

BZ-1 B

HB1B-04(D|

0.43 JQK

3.7

110

0.77

0.34 JQK

16

7.6

26

30

0.085

0.68 JQK

18 JK

<3.3

<1.6

2.1 JQK

39

88

BZ-1 B

HB1B-05

<2.8

3.3

130

0.68 JQK

0.25 JQK

14

6.6

32

710

0.064

0.81 JQK

54 JK

<4.6

<2.3

2.2 JQK

34

120

ISM

BZ-1 B

IB1B-01

0.84 JQK

3.8 JQK

140 JK

0.61 JQK

0 44 JQK

19

8.6

35

65 JK

0.10

0.81 JQK

40 JK

<9.4

<4.7

13 JQK

39

160 JK

BZ-1 B

IB1B-02

<6.9

3.4 JQK

130 JK

0.57 JQK

0.34 JQK

17

7.9

31

60 JK

0.10

0.65 JQK

24 JK

<11

<5.7

2 g JQK

37

150 JK

BZ-1 B

IB1B-03

0.93 JQK

3.8 JQK

140 JK

0.59 JQK

0.45 JQK

18

8.5

40

82 JK

0.12

0.83 JQK

31 JK

<9.5

<4.8

<9.5

36

160 JK

BZ-1 B

IB1B-AV121

0.89 JQK

3.7 JQK

137 JK

0.59 JQK

0.41 JQK

18

8.3

35

69 JK

0.11

0.76 JQK

32 JK

<11

<5.7

1 g JQK

37

157 JK

4-Point Comp.

BZ-1C

HB1C-01

0.50 JQK

3.1

HO JK

0.56 JQK

0.39 JQK

18

6.9

29

34 JK

0.073

0.63 JQK

50

<4.2

<2.1

1.8 JQK

34

110

BZ-1C

HB1C-02

0.67 JQK

3.7

150 JK

0.58 JQK

0.73 JQK

19

7.5

36

100 JK

0.11

1.0 JQK

46

<3.7

<1.9

1.8 JQK

35

260

BZ-1C

HB1C-03

2.2 JQK

3.7

180 JK

0.59 JQK

0.72 JQK

20

7.1

42

140 JK

0.10

1.3 JQK

33

<4.7

<2.3

1.8 JQK

34

220

BZ-1C

HB1C-04

0.41 JQK

3.5

150 JK

0.66 JQK

0.56 JQK

20

8.4

23

28 JK

0.056

0.77 JQK

48

<3.6

<1.8

17 JQK

37

120

BZ-1C

HB1C-05

0.66 JQK

4.7

120 JK

0.60 JQK

0.69 JQK

19

7.7

38

61 JK

0.31

0.92 JQK

67

<3.5

<1.8

1.8 JQK

35

140

ISM

BZ-1C

IB1C-01

0.78 JQK

3.9 JQK

140 JK

0.52 JQK

0.36 JQK

17

6.9

34

68 JK

0.12

0.97 JQK

40 JK

<9.4

<4.7

13 JQK

34

160 JK

BZ-1C

IB1C-02

0.89 JQK

3.7 JQK

150 JK

0.54 JQK

0.45 JQK

17

7.4

34

72 JK

0.12

1 2 JQK

120 JK

<8.9

<4.5

1 g JQK

35

180 JK

BZ-1C

IB1C-03

0.74 JQK

4 -| JQK

140 JK

0.51 JQK

0 44 JQK

16

6.9

30

69 JK

0.11

0.98 JQK

19 JK

<9.1

<4.6

1 q JQK

33

160 JK

BZ-1C

IB1C-AV121

0.80 JQK

3.9 JQK

143 JK

0.52 JQK

0 42 JQK

17

7.1

33

70 JK

0.12

1 1 JQK

60 JK

<9.4

<4.7

1 4 JQK

34

167 JK

Walnut Park Pocket Park (BZ-2)

4-Point Comp.

BZ-2A

HB2A-01

<2.6



4.1

120 JK

0.58 JQK

0.63 JQK

20

8.1

26

40 JK

0.14

0.57 JQK

33

<4.3

<2.2

2.0 JQK

36

310

BZ-2A

HB2A-02

0.42

JQK

6.1

130 JK

0.53 JQK

0.75 JQK

21

7.6

46

93 JK

0.26

0.95 JQK

38

<4.7

<2.3

1.8 JQK

35

200

BZ-2A

HB2A-03

0.26

JQK

3.8

140 JK

0.58 JQK

0.68 JQK

21

8.2

26

90 JK

0.22

0.55 JQK

55

<4.3

<2.2

2.0 JQK

37

180

BZ-2A

HB2A-04

0.86

JQK

18

150 JK

0.54 JQK

0.80

24

7.4

36

140 JK

0.18

0.53 JQK

44

<3.6

<1.8

2.0 JQK

36

200

BZ-2A

HB2A-05

0.80

JQK

6.4

130 JK

0.53 JQK

1.4

22

7.7

39

200 JK

0.21

0.72 JQK

25

<3.7

<1.9

1.9 JQK

36

280

ISM

BZ-2A

IB2A-01

0.88

JQK

4 g JQK

HO JK

0.46 JQK

0.56 JQK

15 JK

7.4

32 JK

91 JK

0.21

0.38 JQK

26 JK

<9.5

<4.7

2 Q JQK

32

170

BZ-2A

IB2A-02

<5.6



4 Q JQK

140 JK

0.49 JQK

0.53 JQK

20 JK

7.9

36 JK

100 JK

0.21

0.65 JQK

26 JK

<9.4

<4.7

¦j y JQK

33

170

BZ-2A

IB2A-03

1.4

JQK

6.0

130 JK

0.50 JQK

0.59 JQK

20 JK

7.9

35 JK

95 JK

0.23

0.56 JQK

30 JK

<9.2

<4.6

1 g JQK

34

180

BZ-2A

IB2A-AV121

1.1

JQK

5.2

127 JK

0.48 JQK

0.56 JQK

18 JK

7.7

34 JK

95 JK

0.22

0.53 JQK

27 JK

<9.5

<4.7

1 g JQK

33

173

Garden View Road Verge (BZ-3)

4-Point Comp.

BZ-3A

HB3A-01

2.9



3.9

180

0.37 JQK

1.5

24

9.2

48

190

0.21

1.8

22

0.43 JQK

<2.3

<4.6

42

350

BZ-3A

HB3A-02

3.2



4.3

170

0.48 JQK

1.5

25

10

50

230

0.20

H JQK

32

0.31 JQK

<1.9

<3.8

41

330

BZ-3A

HB3A-03

3.0



6.3

150

0.49 JQK

1.2

36

10

41

160

0.18

1.0 JQK

23

<4.3

<2.1

<4.3

48

210

BZ-3A

HB3A-04

2.3

JQK

2.9

160

0.41 JQK

0.98

27

9.0

40

130

0.19

1.3 JQK

19

<4.4

<2.2

<4.4

39

210

BZ-3A

HB3A-05

2.8

JQK

8.7

170

0.51 JQK

0.94 JQK

26

11

45

120

0.18

1.0 JQK

26

0.44 JQK

<2.6

<5.1

46

240

ISM

BZ-3A

IB3A-01

2.2

JQK

6.4

200

0.61 JQK

1 5 JQK

29

9.7

61

200

0.20 JK

1 4 JQK

29

<9.3

<4.6

1 4 JQK

38

360

BZ-3A

IB3A-02

1.7

JQK

6.2

190

0.63 JQK

1 2 JQK

28

9.2

55

170

0.15 JK

13 JQK

24

<9.5

<4.7

1 5 JQK

38

310

BZ-3A

IB3A-03

1.3

JQK

7.2

190

0.61 JQK

1 2 JQK

31

9.1

86

180

0.17 JK

1 4 JQK

22

<9.3

<4.7

16 JQK

37

260

BZ-3A

IB3A-AV121

1.7

JQK

6.6

193

0.62 JQK

13 JQK

29

9.3

67

183

0.17 JK

1 4 JQK

25

<9.5

<4.7

1 5 JQK

38

310

4-Point Comp.

BZ-3B

HB3B-01

3.9



220

170 JK

0.57 JQK

1.3

41

11

42

1,600 JK

0.21 JK

12 JQK

31

0.30 JQK

<1.7

<3.4

48 JK

220 JK

BZ-3B

HB3B-02

4.1



40

130 JK

0.48 JQK

1.2

31

9.3

35

160 JK

0.18 JK

0.96 JQK

33

0.84 JQK

<2.3

<4.6

43 JK

240 JK

BZ-3B

HB3B-03

2.8



15

120 JK

0.42 JQK

0.76

20

9.2

33

180 JK

0.19 JK

0.91 JQK

26

<3.7

<1.9

<3.7

40 JK

200 JK

BZ-3B

HB3B-03(D|

1.3

JQK

18

140 JK

0.85

1.4

20 JK

9.9

39

220 JK

0.19 JK

0.78 JQK

24

<4.1

0.61 JQK

2.6 JQK

42

260 JK

BZ-3B

HB3B-04

2.2

JQK

8.6

150 JK

0.61 JQK

0.75 JQK

25

11

36

79 JK

0.29 JK

n JQK

23

<4.7

<2.4

<4.7

47 JK

150 JK

BZ-3B

HB3B-05

2.9



4.9

180 JK

0.58 JQK

1.3

32

12

52

140 JK

0.21 JK

1.0 JQK

33

<4.2

<2.1

<4.2

51 JK

280 JK

T-14 (1 of 3)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Sample

sub-BZ

Sample No.

Analyte

Type

Antimony

Arsenic

Barium

Beryllium

Cadmium

Chromium

Cobalt

Copper

Lead

Mercury

Mo

Nickel

Selenium

Silver

Thallium

Vanadium

Zinc



Re

sidential RSL

31



0.68

15,000

160

7.1

„<1>

23

3,100

400

11

390

1,500

390

390

0.78

390

23,000



BZ-3B

IB3B-01

1.8

JQK

11

170

0.62 JQK

0.94 JQK

27

9.0

47

180

0.25 JK

13 JQK

25

<9.2

<4.6

16 JQK

38

240



BZ-3B

IB3B-02

1.4

JQK

14

180

0.63 JQK

0.92 JQK

27

9.2

43

200

0.17 JK

.| 4 JQK

27

<9.6

<4.8

2 Q JQK

39

220



BZ-3B

IB3B-03

2.2

JQK

16

170

0.62 JQK

0.98 JQK

27

9.3

47

200

0.18 JK

^ 2 JQK

27

<9.4

<4.7

^ y JQK

39

220



BZ-3B

IB3B-AV121

1.8

JQK

14

173

0.62 JQK

0.95 JQK

27

9.2

46

193

0.20 JK

13 JQK

26

<9.6

<4.8

-j g JQK

39

227

Q.

BZ-3C

HB3C-01

0.82

JQK

2.7

120 JK

0.58 JQK

0.95

19 JK

6.5

30

99 JK

0.15 JH

0.76 JQK

15

<4.5

<2.3

1.7 JQK

30

130 JK

E
o

BZ-3C

HB3C-02

1.7

JQK

4.5

130 JK

0.75 JQK

1.3

19 JK

9.0

47

160 JK

0.17 JH

0.78 JQK

47

<4.7

<2.4

2i JQK

39

280 JK



BZ-3C

HB3C-03

0.76

JQK

2 4 JQK

95 JK

0.49 JQK

0.71 JQK

11 JK

5.7

24

170 JK

0.34 JH

0.52 JQK

24

<4.4

<2.2

1.7 JQK

27

130 JK

o
CL

BZ-3C

HB3C-04

1.3

JQK

4.7

140 JK

0.72 JQK

1.6

22 JK

9.9

49

140 JK

0.10 JH

H JQK

23

<4.6

<2.3

2 4 JQK

40

240 JK

T

BZ-3C

HB3C-05

1.2

JQK

4.8

170 JK

0.82 JQK

1.6

27 JK

9.6

51

170 JK

0.38 JH

0.92 JQK

39

<4.5

0.50 JQK

2.3 JQK

41

290 JK



BZ-3C

IB3C-01

2.4

JQK

4 5 JQK

150

0.51 JQK

0.90 JQK

20

7.5

45

170

0.17 JK

-| -| JQK

20

<9.6

<4.8

2 2 JQK

32

230

2

BZ-3C

IB3C-02

1.3

JQK

5.6

150

0.47 JQK

0.98 JQK

21

7.0

50

180

0.17 JK

0.98 JQK

16

<9.1

<4.6

.| 5 JQK

31

260



BZ-3C

IB3C-03

1.9

JQK

3 JQK

130

0.18 JQK

^ 2 JQK

17 JK

6.7

42 JK

170

0.24 JK

0.82 JQK

15 JK

<9.3

<4.7

<9.3

23 JK

220



BZ-3C

IB3C-AV121

1.9

JQK

4 4 JQK

143

0.39 JQK

-j q JQK

19 JK

7.1

46 JK

173

0.19 JK

0.97 JQK

17 JK

<9.6

<4.8

-j g JQK

29 JK

237

S. Gate Road Verge (BZ-4)



BZ-4A

HB4A-01

1.6

JQK

6.4

210 JK

1.1

1.8

31 JK

13

60

170 JK

0.16 JL

14 JQK

47

<4.6

o.y JQK

2.9 JQK

55

440 JK

Q_

E

BZ-4A

HB4A-02

2.7

JK

6.1

180 JK

0.82

1.8

25 JK

11

65

380 JK

0.40 JL

1.8

31

<3.7

0.45 JQK

2.3 JQK

44

400 JK

O

BZ-4A

HB4A-02(D|

2.2

JQK

6.5

180 JK

0.92

2.0

26 JK

12

71

370 JK

0.55

1.9

30

<4.4

0.62 JQK

2.6 JQK

48

450 JK

_c

BZ-4A

HB4A-03

2.1

JQK

55

170 JK

0.88 JQK

1.3

22 JK

11

55

560 JK

0.16 JL

1.3 JQK

30

<4.7

<2.4

2 4 jqk

43

310 JK

a.

BZ-4A

HB4A-04

1.5

JQK

5.7

160 JK

0.98

1.4

27 JK

12

44

120 JK

0.12 JL

1.3 JQK

23

<4.5

0.87 JQK

3.2 JQK

51

190 JK



BZ-4A

HB4A-05

1.6

JQK

5.0

170 JK

0.98 JQK

1.4

23 JK

12

53

160 JK

0.11 JL

15 JQK

24

<4.9

<2.5

3.4 JQK

48

240 JK



BZ-4A

IB4A-01

2.1

JQK

6.8

170

0.35 JQK

.| 5 JQK

23 JK

10

48 JK

170

0.15 JK

-| -| JQK

20 JK

<9.5

<4.8

<9.5

36 JK

210



BZ-4A

IB4A-02

3.3

JQK

8.3

190

0.34 JQK

^ y JQK

26 JK

11

56 JK

160

0.18 JK

13 JQK

28 JK

<9.5

<4.7

-| -| JQK

46 JK

230



BZ-4A

IB4A-03

3.1

JQK

8.0

190

0.35 JQK

^ y JQK

26 JK

11

65 JK

170

0.15 JK

-| 5 JQK

36 JK

<9.6

<4.8

<9.6

45 JK

240



BZ-4A

IB4A-AV121

2.8

JQK

7.7

183

0.35 JQK

16 JQK

25 JK

11

56 JK

167

0.16 JK

13 JQK

28 JK

<9.6

<4.8

.| -| JQK

42 JK

227

Q.

BZ-4B

HB4B-01

2.0

JQK

5.1

180 JK

0.89 JQK

1.9

32 JK

12

63

330 JK

0.16 JL

1.9

31

<4.6

0.59 JQK

3.1 JQK

47

400 JK

E
o

BZ-4B

HB4B-02

1.6

JQK

4.3

140 JK

0.73 JQK

1.2

19 JK

9.0

39

200 JK

0.11 JL

n JQK

23

<4.4

<2.2

2 4 JQK

40

200 JK



BZ-4B

HB4B-03

2.3

JQK

2.8

130 JL

0.39 JQK

0.75 JQK

19 JK

8.7

31

120 JK

0.072 JL

0.93 JQK

17

<4.2

<2.1

<4.2

40

150 JL

o
CL

BZ-4B

HB4B-04

2.6

JQK

6.9

150 JL

0.35 JQK

0.90 JQK

22 JK

10

38

120 JK

0.10 JL

12 JQK

20

<5.0

<2.5

<5.0

43

170 JL

T

BZ-4B

HB4B-05

4.0

JK

4.6

170 JL

0.30 JQK

0.89 JK

20 JK

7.9

45

130 JK

0.18 JL

H JQK

21

0.39 JQK

<1.7

<3.3

36

210 JL



BZ-4B

IB4B-01

3.0

JQK

4 o JQK

160

0.26 JQK

-| 5 JQK

24

9.9

49

160

0.14 JH

13 JQK

24

<9.5

<4.8

<9.5

42

390



BZ-4B

IB4B-02

3.0

JQK

6.0

170

0.27 JQK

16 JQK

25

10

50

190

0.16 JH

13 JQK

27

<9.1

<4.6

<9.1

42

210



BZ-4B

IB4B-03

3.2

JQK

5.8

170

0.25 JQK

16 JQK

27

11

52

200

0.18 JH

.| 4 JQK

37

<9.6

<4.8

<9.6

45

220



BZ-4B

IB4B-AV121

3.1

JQK

5.3 JQK

167

0.26 JQK

16 JQK

25

10

50

183

0.16 JH

13 JQK

29

<9.6

<4.8

<9.6

43

273



BZ-4C

HB4C-01

2.8

JK

3.5

160 JL

0.47 JQK

0.84 JK

23 JK

9.8

37

100 JK

0.12 JL

0.86 JQK

23

0.55 JQK

<2.1

<4.2

43

160 JL

Q_

E

BZ-4C

HB4C-02

3.1

JK

3.2

250 JL

0.52 JQK

1.5 JK

27 JK

10

54

180 JK

0.16 JL

1 4 JQK

24

0.58 JQK

<2.1

<4.2

43

330 JL

O

BZ-4C

HB4C-03

2.3

JQK

5.4

160 JL

0.43 JQK

0.87 JQK

24 JK

9.6

42

200 JK

0.16 JL

1 4 JQK

24

0.54 JQK

<2.3

<4.6

43

200 JL

_c

BZ-4C

HB4C-04

2.7

JK

6.4

170 JL

0.56 JQK

0.97 JK

26 JK

9.7

43

140 JK

0.20 JL

H JQK

35

0.50 JQK

<1.8

<3.6

46

190 JL

a.

BZ-4C

HB4C-05

2.5

JK

4.8

150 JL

0.48 JQK

1.3 JK

28 JK

9.4

38

130 JK

0.21 JL

0.79 JQK

19

0.51 JQK

<2.0

<3.9

41

170 JL



BZ-4C

HB4C-05(D|

1.5

JQK

6.2

160 JK

0.93 JQK

1.9

28 JK

11

47

150 JK

0.14 JK

0.91 JQK

22

<5.0

<2.5

2.3 JQK

46

210 JK



BZ-4C

IB4C-01

2.8

JQK

4 Q JQK

170

0.30 JQK

1.8

25 JK

10

52 JK

230

0.28 JK

-| 4 JQK

21 JK

<9.4

<4.7

<9.4

41 JK

250



BZ-4C

IB4C-02

2.2

JQK

3.9 JQK

150

0.34 JQK

-| 5 JQK

17 JK

8.4

43 JK

200

0.34 JK

-j q JQK

16 JK

<9.2

<4.6

<9.2

28 JK

210



BZ-4C

IB4C-03

3.1

JQK

4 4 JQK

170

0.33 JQK

^ y JQK

24 JK

10

52 JK

220

0.29 JK

-j 2 JQK

20 JK

<9.1

<4.6

<9.1

43 JK

250



BZ-4C

IB4C-AV121

2.7

JQK

4 4 JQK

163

0.32 JQK

^ y JQK

22 JK

9.5

49 JK

217

0.30 JK

^ 2 JQK

19 JK

<9.4

<4.7

<9.4

37 JK

237

Leon H. Washington Park (BZ-5)



BZ-5A

HB5A-01

3.7

JK

25

110 JL

0.32 JQK

0.39 JQK

18 JK

8.0

48

59 JK

0.065 JH

0.71 JQK

28

0.33 JQK

<1.4

<2.8

34

180 JL

E

BZ-5A

HB5A-02

3.7

JK

25

140 JL

0.44 JQK

0.69 JQK

22 JK

9.4

48

90 JK

0.14 JH

15 JQK

21

0.57 JQK

<2.0

<4.1

43

160 JL

O

BZ-5A

HB5A-03

4.8

JK

14

130 JL

0.39 JQK

0.62 JQK

24 JK

9.8

44

65 JK

0.095 JH

12 JQK

22

0.53 JQK

<2.3

<4.6

43

140 JL

c

BZ-5A

HB5A-04

4.3

JK

20

110 JL

0.32 JQK

0.57 JQK

18 JK

7.9

58

69 JK

0.16 JH

1.0 JQK

20

<4.9

<2.5

<4.9

35

150 JL

CL

BZ-5A

HB5A-04(D|

3.5

JK

24

120 JK

0.65 JQK

1.2

19 JK

8.9

76

85 JK

0.13 JK

12 JQK

24

<4.5

<2.3

2.5 JQK

37

200 JK



BZ-5A

HB5A-05

3.9



19

140 JL

0.33 JQK

0.56 JQK

49 JK

7.8

58

74 JK

0.18 JH

2.3

19

17 JQK

<2.7

<5.4

41

170 JL



BZ-5A

IB5A-01

3.3

JQK

15

130

0.22 JQK

^ 2 JQK

22

8.9

58

96

0.13 JH

16 JQK

32

<9.5

<4.7

0.80 JQK

37

160



BZ-5A

IB5A-02

3.3

JQK

18

140

0.23 JQK

.| -| JQK

22

8.9

59

75

0.12 JH

2 Q JQK

27

<9.4

<4.7

<9.4

34

160



BZ-5A

IB5A-03

2.4

JQK

14

110

0.20 JQK

0.87 JQK

16

7.4

49

60

0.12 JH

-| 2 JQK

21

<9.4

<4.7

<9.4

27

140



BZ-5A

IB5A-AV121

3.0

JQK

16

127

0.22 JQK

-| -| JQK

20

8.4

55

77

0.12 JH

16 JQK

27

<9.5

<4.7

0.80 JQK

33

153

CL

BZ-5B

HB5B-01

4.0

JK

16

240 JL

0.34 JQK

0.82 JQK

21 JH

7.9

57

240 JK

0.25 JH

17 JQK

21

0.57 JQK

<2.6

<5.2

34

290 JL

E
o

BZ-5B

HB5B-02

3.2

JK

15

120 JL

0.52 JQK

0.30 JQK

25 JK

9.7

43

45 JK

0.099 JH

1.0 JQK

34

0.27 JQK

<1.7

<3.3

43

100 JL



BZ-5B

HB5B-03

4.6

JK

41

120 JL

0.40 JQK

5.2 JK

23 JK

8.4

58

52 JK

0.12 JH

1.8

25

<3.4

<1.7

<3.4

37

120 JL

o

BZ-5B

HB5B-04

4.2



18 JK

180 JL

0.45 JQK

0.97 JK

28 JK

11

72

110 JK

0.23 JH

¦\ 4 JQK

28

0.95 JQK

<2.2

<4.4

46

230 JL



BZ-5B

HB5B-05

3.6

JK

9.8

150 JL

0.29 JQK

0.77 JQK

22 JK

8.8

63

110 JK

0.18 JH

12 JQK

21

0.38 JQK

<2.3

<4.7

36

260 JL

T-14 (2 of 3)


-------
Central Metal SI Report
CAN00903324

September 2023
TABLES

Sample
Type

sub-BZ

Sample No.

Analyte

Antimony

Arsenic

Barium

Beryllium

Cadmium

Chromium

Cobalt

Copper

Lead

Mercury

Mo

Nickel

Selenium

Silver

Thallium

Vanadium

Zinc



Re

sidential RSL

31



0.68

15,000

160

7.1

„<1>

23

3,100

400

11

390

1,500

390

390

0.78

390

23,000

ISM

BZ-5B

IB5B-01

3.3

JQK

14

130

0.20 JQK

.| -| JQK

19

8.2

62

86

0.12

-| 2 JQK

26

<9.3

<4.7

<9.3

30

180

BZ-5B

IB5B-02

3.5

JQK

14

130

0.20 JQK

.| -| JQK

19

7.6

62

87

0.16

.| 4 JQK

25

<9.2

<4.6

<9.2

28

180

BZ-5B

IB5B-03

2.7

JQK

15

130

0.20 JQK

.| -| JQK

21

7.9

60

94

0.15

.| 5 JQK

32

0.84 JQK

<4.7

<9.3

29

180

BZ-5B

IB5B-AV121

3.2

JQK

14

130

0.20 JQK

.| -| JQK

20

7.9

61

89

0.14

.| 4 JQK

28

0.84 JQK

<4.7

<9.3

29

180

4-PointComp.

BZ-5C

HB5C-01

1.0

JQK

8.3

110 JL

0.60 JQK

0.79 JK

19 JK

8.3

41

51 JK

0.13 JH

0.98 JQK

40

<3.2

0.39 JQK

2.0 JQK

38

140 JL

BZ-5C

HB5C-02

4.3



17

490 JL

0.44 JQK

0.87 JK

37 JK

9.2

62

130 JK

0.58 JH

2.4

33

0.95 JQK

<2.0

<4.0

39

270 JL

BZ-5C

HB5C-03

3.6



16

130 JL

0.44 JQK

0.48 JQK

25 JK

9.3

47

55 JK

0.092 JH

12 JQK

52

0.68 JQK

<2.1

<4.2

40

120 JL

BZ-5C

HB5C-04

3.1



13

130 JL

0.45 JQK

0.50 JQK

30 JK

10

50

38 JK

0.06 JK

2.0

52

<4.5

<2.2

<4.5

40

130 JL

BZ-5C

HB5C-05

3.3



19

130 JL

0.44 JQK

0.61 JQK

22 JK

9.4

48

62 JK

0.13 JK

1.3 JQK

25

0.56 JQK

<1.8

<3.7

41

140 JL

ISM

BZ-5C

IB5C-01

3.0

JQK

14

200

0.23 JQK

-| -| JQK

19

8.0

56

65

0.12

.| 5 JQK

28

<9.4

<4.7

<9.4

30

160

BZ-5C

IB5C-02

2.7

JQK

12

140

0.21 JQK

0.93 JQK

17

7.3

49

58

0.12

^ 2 JQK

23

<9.2

<4.6

<9.2

29

140

BZ-5C

IB5C-03

2.8

JQK

15

160

0.21 JQK

-| -| JQK

18

8.4

53

70

0.13

-j g JQK

27

<9.2

<4.6

<9.2

29

160

BZ-5C

IB5C-AV121

2.8

JQK

14

167

0.22 JQK

-j q JQK

18

7.9

53

64

0.12

-| 5 JQK

26

<9.4

<4.7

<9.4

29

153

Cudahy Road Verge Reference Area

4-Point Comp.

BZ-6A

HB6A-01

0.97

JQK

4.1

150 JK

0.60 JQK

1.1

24

8.7

49

180 JK

0.081

1.0 JQK

47

<3.5

<1.8

1.9 JQK

36

240

BZ-6A

HB6A-02

0.76

JQK

3.5

150 JK

0.48 JQK

1.2

23

7.1

38

170 JK

0.17

0.85 JQK

21

<3.7

<1.8

1.6 JQK

35

240

BZ-6A

HB6A-02(D|

0.58

JQK

3.6

140 JK

0.46 JQK

1.0

21

6.6

34

170 JK

0.20

0.78 JQK

21

<4.2

<2.1

1.8 JQK

33

230

BZ-6A

HB6A-03

0.38

JQK

6.2

140 JK

0.64 JQK

0.86 JQK

22

8.9

46

73 JK

0.39

12 JQK

20

<4.4

<2.2

2.6 JQK

37

270

BZ-6A

HB6A-04

0.48

JQK

3.5

130 JK

0.46 JQK

0.90 JQK

27

6.9

39

94 JK

0.080

0.89 JQK

45

<4.7

<2.3

15 JQK

35

200

BZ-6A

HB6A-05

0.43

JQK

3.4

120 JK

0.43 JQK

0.95

19

6.4

42

110 JK

0.11

1.0 JQK

53

<3.9

<1.9

15 JQK

30

190

ISM

BZ-6A

IB6A-01

1.3

JQK

4 Q JQK

140 JK

0 44 JQK

.| -| JQK

23 JK

7.1

45 JK

200 JK

0.21

-j q JQK

20 JK

<9.4

<4.7

2 2 JQK

31

240

BZ-6A

IB6A-02

1.2

JQK

4.3 JQK

150 JK

0.40 JQK

-j q JQK

22 JK

6.6

48 JK

200 JK

0.18

13 JQK

24 JK

<9.5

<4.7

^ 7 JQK

30

260

BZ-6A

IB6A-03

1.3

JQK

4 7 JQK

140 JK

0 42 JQK

.| -| JQK

21 JK

6.8

43 JK

180 JK

0.16

0.97 JQK

24 JK

<9.4

<4.7

13 JQK

30

250

BZ-6A

IB6A-AV121

1.3

JQK

4 6 JQK

143 JK

0 42 JQK

-| -| JQK

22 JK

6.8

45 JK

193 JK

0.18

-| -| JQK

23 JK

<9.5

<4.7

^ y JQK

30

250

all values are reported in mg/kg
Samples collected in OctoPer 2022

1	= an RSL for Total (i e , unspeciated) cnromium nas not Peen estaPlisned

2	= "-AV" Result is Arithmetic Mean of Primary (-01), Duplicate (-02), and Triplicate (-03) Sample Results
D = Field Duplicate Sample

J = Tne result is an estimated quantity
Q = Tne reported result is less tnan tne SQL

Definitions

ISM = incremental Sampling Metnodology
mg/kg = milligram per kilogram
MO = MolyPdenum

RSL = EPA Regional Screening Level (May 2023, THQ =1 0, Risk = 10-6)
BZ = Background Sampling Zone
SQL = Sample Quantitation Limit

<## = Anal>te net detected at or aPove indicated Sample Quantitation Limit (SQL)

T-14 (3 of 3)


-------
Central Metal SI Report

September 2023

CAN000903324	TABLES

Table 15: Bulletin 104 Aquifer Elevations near Site

Aquifer

Estimated Elevation
(ft amsl)

Estimated Depth
(ft-bgs)

Top

Base

Top

Base

Gaspur

45

-5

95

145

Exposition

-25

-90

165

230

Gage

-155

-220

295

360

Hollydale

-320

-365

460

505

Lynwood

-480

-575

620

715

Silverado

-640

-775

780

915

Sunnyside

-1020

-1320

1160

1460

Definitions:
amsl = above mean sea level
bgs = below ground surface
ft = feet

Reference:
DWR, 1961

T-15 (1 of 1)


-------
Central Metal SI Report

September 2023

CAN000903324	TABLES

Table 16: Water Purveyors Operating Active Wells Within the Target Distance Limit

Water Company Name

No. of Wells in
System(1)

Total Population
Served<2)

No. of Wells
Within
4 Miles(1)

Golden State Water Co. - Florence/Graham

7

62,970

7

City of South Gate

8

76,443

8

City of Huntington Park

5

15,275

5

Walnut Park Mutual Water Company

3

16,180

3

Golden State Water Co. - Bell, Bell Gardens

6

54,309

4

Los Angeles Dept. of Water and Power

44

3,868,811

4

City of Lynwood

5

66,967

5

Tract 349 Mutual Water Company

2

3,132

2

PWC (Liberty) - Lynwood

2

24,171

1

PWC (Liberty) - Compton

2

23,802

1

City of Compton

6

74,877

3

Golden State Water Co. - Willowbrook

2

10,615

2

Lynwood Park Mutual Water Company

3

2,300

3

Maywood Mutual Water Company #1

2

5,500

2

May wood Mutual Water Company #2

2

6,349

2

Maywood Mutual Water Company #3

3

9,500

3

Golden State Water Co. - Southwest

13

275,369

2

Tract 180 Mutual Water Company

2

14,000

2

City of Vernon - no standby

8

28,000

8

Sativa-LA County Water District

2

4,385

2

Notes:

1	= Does not include standby wells unless otherwise noted

2	= Includes population served by water sources other than groundwater (e.g., imported surface water)

Reference:
Weston, 2023

T-16 (1 of 1)


-------
Central Metal SI Report

CAN000903324

September 2023

FIGURES

FIGURES

F-i


-------
CALIFORNIA

NEVADA

SANTA MONICA

POMONA

Sivi

Francisco

LOS ANGELES.COUNTY

Montebello

Beverly Hills

*Los Angeles

/L East Los Anoel

Commerce

Monica

Irigiewood

B^yvney

May wood

Pico.Rr

Huntington
Park

Torrance

8201 Santa Fe Ave,
Huntington Park, CA

Legend

^ Central Metal Site Location
111 Site Inspection (SI) Project Area

Bell Gardens

South
G ale

FIGURE 1
SITE LOCATION MAP

Central Metal
Site Inspection Report
Huntington Park, Los Angeles County, CA

Downey

Lynvvood

CENTURY FWY_

,GLINN M ANDERSON FREEWAY AND TRANSIT

Prepared For
U.S. Environmental
Protection Agency, Region 9

Prepared By

Weston Solutions, Inc.
Concord, CA 94520
September 2023

CENTURY FWY

EPA ID No.:

CAN000903324

WESTON Task Order:

12767.900.004.2000.02


-------
Beverly Hills

East Los Annel-

(~aliforni

Iriglewood

Downey

Grand

Torrance

Legend

V//A Central Metal Site Boundary

~ Background Sampling Subzone

I I Residential Sampling Subzone

Residential Sampling Zones

Florence-Firestone Sampling
Zone

Walnut Park Sampling Zone

Metro-

Firestone

Ardmore

FIGURE 2
PROJECT AREA MAP

Central Metal
Site Inspection Report
Huntington Park, Los Angeles County, CA

L-durel

Firestone

Prepared For
U.S. Environmental
Protection Agency, Region 9

nwood PI

Prepared By

Weston Solutions, Inc.
Concord, CA 94520
September 2023

EPA ID No.:

CAN000903324

WESTON Task Order:

12767.900.004.2000.02

Stanford Av
Elementary

XI
_>

CO

0)
+-"
c
o
E
cc

Nadeau St

0)

3
o

D

r+

(D

E
<
Q_

E 84th St

E 85th St

42

E 92nd St


-------
Legend

17Jj Parcel Boundary

V/ Former Railroad Area (FRA)

\ > Former Tank Manufacturing
v Area (FTMA)

Residential Sampling Subzone

Residential Sampling Zones

Florence-Firestone Sampling
Zone

Walnut Park Sampling Zone
Notes:

Imagery Source: NearMap 8/27/2023

FIGURE 3
PARCEL LAYOUT MAP

Central Metal
Site Inspection Report
Huntington Park, Los Angeles County, CA

Prepared For
U.S. Environmental
Protection Agency, Region 9

Prepared By

Weston Solutions, Inc.
Concord, CA 94520
September 2023

WESTON Task Order:

12767.900.004.2000.02


-------
Former Stormwater
Treatment System

Main Office



Former Warehouse Extension
and Foundry Area

Warehouse

HWSA



ptorrnwatej
[Treatment
\ System.

FIGURE 4
SITE LAYOUT MAP

Central Metal
Site Inspection Report
Huntington Park, Los Angeles County, CA

Prepared For
U.S. Environmental
Protection Agency, Region 9

Prepared By

Weston Solutions, Inc.
Concord, CA 94520
September 2023

Maintenance
Shop

Legend

Existing Site Structure
Historical Site Feature
Residential Sampling Subzone
Central Metal Site Boundary

Notes:

Imagery Source: NearMap 8/27/2023

WESTON Task Order:

12767.900.004.2000.02

EPA ID No.:

CAN000903324


-------
DMS-SV-6

No Wells Installed

No Deep
Well Installed

DfWf'

Residential EPA VISLs:

Commercial EPA VISLs:

Legend

a Existing Site Structure
I I Central Metal Site Boundary
» I Residential Sampling Sutazone
o Soil Vapor Probe Location

Notes:

-	Bold and Underlined values indicate results

that exceed Resident VISL

-	All units in micrograms per cubic meter (|jg/m3)

-	Samples collected in April 2019

-	imagery Source: NearMap 8/27/2023
Definitions:

CCI4 = Carbon Tetrachloride

ft-bgs = feet below ground surface

ND = Not Detected above Reporting Limit

PCE = Tetrachloroethylene

VISL = EPA Vapor Intrusion Screening Level

©

a	f™1	200

FIGURE 5

STAGE 1 - SELECT SOIL VAPOR
RESULTS

Central Metal
Site Inspection Report

Huntington Park, Los Angeles County, CA

Prepared Fof

U.S. Environmental
Protection Agency, Region 9

Prepared By

Weston Solutions, inc.
Concord. CA 94520
September 2023

8*1!

EPA ID No,

CANDCW90J-324

WESTON Task Order:

12767 900 0042000.02


-------
SV-2

2 ft-bgs:

Arsenic = 2.7
Lead = 14
70 ft-bgs:
Arsenic = 0.89
Lead = 1.5

SV-3
2

Arsenic = 2.5
Lead = 7.5
10 ft-bgs:
Arsenic = 0.97
Lead = 1.3

SV-1

2 ft-bgs:

Arsenic = 3.3
Lead = 8.0
10 ft-bgs:
Arsenic = 0.83
Lead = 1.6

2 ft-bgs:
Arsenic = 8.3
Lead = 338
10 ft-bgs: -

SV-5

2 ft-bgs:

Arsenic = 3.1
Lead = 7.1
10 ft-bgs:
Arsenic = 0.76
Lead = 1.3

SV-9

2 ft-bgs:
Arsenic = 7.7
Lead = 196J
10 ft-bgs:
Arsenic =1.1
Lead = 1.7 J

2 ft-bgs:
Arsenic = 1.9
Lead = 4.0 J
10 ft-bgs:
Arsenic = 1.2
Lead = 1.5 ¦'

2 ft-bgs:
Arsenic = 7.0
Lead = 68 J
10 ft-bgs:
Arsenic = 2.0
Lead = 2.5 J

2 ft-bgs:
Arsenic =14
Lead = 19 J
10 ft-bgs: -

TTTW^T

O" J;"'"

pppffc'"-rir

2 ft-bgs:
Arsenic = 3.8
Lead = 6.1 J
10 ft-bgs:
Arsenic = 1.3
Lead = 1.5 J

USEPA RSLs:

Resident Soil:
Arsenic = 0.68
Lead = 400

Industrial Soil:
Arsenic = 3.0
Lead = 800

SV-20

2 ft-bgs:
Arsenic = 2.0
Lead = 6.3 J
10 ft-bgs:
Arsenic = 1.2
Lead = 1.4 J

SV-4

2 ft-bgs:
Arsenic = 2.6
Lead = 5.5
10 ft-bgs:
Arsenic = 1.0
Lead = 1.4

SV-7
2 ft-bgs:
Arsenic = 2.3
Lead = 27
10 ft-bgs:
Arsenic =1.1
Lead = 6.5

SV-8

2 ft-bgs:

Arsenic = 3.2
Lead = 31
10 ft-bgs:
Arsenic = 0.44
Lead = 1.0 J

2 ft-bgs:

Arsenic = 2.7
Lead = 16 J
10 ft-bgs:
Arsenic = 0.65
Lead = 1.4 J

SV-14

2 ft-bgs:

Arsenic = 2.3
Lead = 4.6 J
10 ft-bgs:
Arsenic = 0.75
Lead = 1.0 J

2 ft-bgs:

Arsenic = 2.6
Lead = 4.3 J
10 ft-bgs:
Arsenic = 0.64
Lead = 1.3 J

2 ft-bgs:

Arsenic = 5.5
Lead = 301 J
10 ft-bgs:
Arsenic = 0.96
Lead = 2.0 J

2 ft-bgs:
Arsenic = 3.0
Lead = 170 J
10 ft-bgs:
Arsenic = 1.2
Lead = 2.2 J

2 ft-bgs:

Arsenic = 5.4
Lead = 90 J
10 ft-bgs:
Arsenic = 0.74
Lead = 2.0 J

Legend

a Existing Site Structure
I I Central Metal Site Boundary
I I Residential Sampling Sutazone
o Soil Sample Location

Notes:

-All units in milligrams per kilogram (mg/kg)

-	Samples collected in April 2019

-	Imagery Source: NearMap 8/27/2023
Definitions:

ft-bgs = feet below ground surface
RSL = Regional Screening Level
Qualifiers:

J = estimated result

e

FIGURE 6

STAGE 1 - SELECT SOIL RESULTS

Central Metal
Sile Inspection Report

Huntington Park. Los Angeles County, CA

Prepared Fof

U.S. Environme
Protection Agency, Region 9

Prepared By

Weston Solutions, inc.
Concord. CA 94520
September 2023

8*1!

EPA ID No,

CANDCW90J-324

WESTON Task Order:

12767.900 004.2000.02


-------
DP-8

2 ft-bgs:
Arsenic = 5.3
Lead = 49
5 ft-bgs:
Arsenic = 7.8
Lead = 6.8 J
10 ft-bgs:
Arsenic = 2.3
Lead = 1.9
15 ft-bgs:
Arsenic = 4.1
Lead = 3.8

2 ft-bgs:

Arsenic = 2.6 J
Lead = 8.5 J
5 ft-bgs:

Arsenic = 2.1 J
Lead = 3.2 J
10 ft-bgs:
Arsenic = 0.74
Lead = 1.3 J
15 ft-bgs:
Arsenic = 3.4 J
Lead = 5.1 J

DP-S

2 ft-bgs:
Arsenic = 3.1
Lead = 4.9 -
5 ft-bgs:
Arsenic = 1.4
Lead = 2.4 J
10 ft-bgs:
Arsenic = 2.2
Lead = 1.4 J
15 ft-bgs:
Arsenic = 4.7
Lead = 6.6 J

DP-3

2 ft-bgs:
Arsenic = 3.4
Lead = 29 J
5 ft-bgs:
Arsenic = 2.5
Lead = 6.2 J
10 ft-bgs:
Arsenic = 1.6
Lead = 2.3 J
15 ft-bgs:
Arsenic = 3.6
Lead = 4.6 -

DP-6

2 ft-bgs:
Arsenic = 4.9
Lead - 5.0
5 ft-bgs:
Arsenic = 2.4
Lead = 1.9
10 ft-bgs:
Arsenic = 1.7
Lead = 1.1
15 ft-bgs:
Arsenic = 6.8
Lead = 3.0

DP-4

2 ft-bgs:
Arsenic = 6.0
Lead = 203
5 ft-bgs:
Arsenic = 4.0
Lead = 4.0
10 ft-bgs:
Arsenic = 1.8
Lead = 1.8
15 ft-bgs:
Arsenic = 2.9
Lead = 2.1

DP-1

2 ft-bgs:
Arsenic = 9.6
Lead = 138
5 ft-bgs:
Arsenic = 2.7
Lead = 2.0
10 ft-bgs P<;
Arsenic = 2.4
Lead = 1.9
15 ft-bgs:
Arsenic = 4.9
Lead = 7.7

DP-2

2 ft-bgs:
Arsenic = 3.5
Lead = 138
5 ft-bgs:
Arsenic = 4.9
Lead = 13
10 ft-bgs:
Arsenic = 2.3
Lead = 1.7
15 ft-bgs:
Arsenic = 2.2
Lead = 1.9

DP-9

2 ft-bgs:
Arsenic = 14 -
Lead = 152
5 ft-bgs:
Arsenic = 6.4
Lead = 15
10 ft-bgs:
Arsenic = 2.1
Lead = 1.6
15 ft-bgs:
Arsenic = 2.4
Lead = 2.2

DP-7

2 ft-bgs:
Arsenic = 8.3
Lead = 612
5 ft-bgs:
Arsenic = 2.6
Lead = 2.1
10 ft-bgs:
Arsenic = 2.2
Lead = 1.6
15 ft-bgs:
Arsenic = 2.8
Lead = 2.6

USEPA RSLs:

Resident Soil:
Arsenic = 0.68
Lead = 400

Industrial Soil:
Arsenic = 3.0
Lead = 800

Legend

a Existing Site Structure
I I Central Metal Site Boundary
I I Residential Sampling Sutazone
o Soil Sample Location

Notes:

-	All units in milligrams per kilogram (mg/kg)

-	Samples collected in June 2019

-	Imagery Source: NearMap 8/27/2023
Definitions:

ft-bgs = feet below ground surface
RSL = Regional Screening Level
Qualifiers:

J = estimated result

e

FIGURE 7

STAGE 2 - SELECT SOIL RESULTS

Central Metal
Site Inspection Report
Huntington Parit, Los Angeles County, CA

Prepared Fof

U.S. Environmental
Protection Agency, Region 9

Prepared By

Weston Solutions, Inc.
Concord. CA94520
September 2023



EPA ID NO,

CANOOOUOS-324

WESTON Task Order:

12767 900 0042000.02


-------
97 ft-bgs:
trans-1,2-DCE = 0.12
ICE = 0.21 J

rgjp-"";»'"r

» Fff n B-'-1''v
T'f

WfW r'f

"ci-fFr-r#*!

101 ft-bgs:	—_

trans-1,2-DCE = ND
ICE = ND

prgifM

¦¦ ¦ - ni»«: t.	•

CPT-3

94 ft-bgs:
trans-1,2-DCE = ND
TCE = ND

98 ft-bgs:
trans-1,2-DCE = ND
TCE = ND

Legend

a Existing Site Structure
I I Central Metal Site Boundary
I I Residential Sampling Sutazone
o Groundwater Sample Location

Notes:

-	All units in micrograms per kilogram (pg/kg)

-	Samples collected in June 2019

-	Imagery Source: NearMap 8/27/2023
Definitions:

DCE = Dichloroethylene
ft-bgs = feet below ground surface
ND = Not Detected above reporting limit
TCE = Trichloroethylene
Qualifiers:

J = estimated result

e

200

FIGURE 8

STAGE 2 - SELECT
GROUNDWATER RESULTS

Central Metal
Site Inspection Report
Huntington Park, Los Angeles County, CA

Prepared Pot

U.S. Environmental	r A

Protection Agency, Region 0 \wi

Prepared By

Weston Solutions, Inc.
Concord. CA 94520
September 2023

8*1!

EPA ID NO,

CANPUJ90J-324

WESTON Task Order:

12767.900 004.2000.02


-------
.l j4i.iiiuyuL.aui.,.

RZ4a

IR'ZM



Hawthorn* Hunt AP California

Latlti



lIBH3



Li

Legend

h 1 Residential Sampling Subzone
ll! I Central Metal Site Boundary
Historical Debris Pile

Residential Sampling Zones

Florence-Firestone Sampling
Zone

Walnut Park Sampling Zone

Notes:

imagery Source; NearMap 8/27/2023

FIGURE 9

STAGE 3 - RESIDENTIAL
NEIGHBORHOOD LAYOUT MAP

Central Metal
Site Inspection Report

Huntington Park, Los Angeles County, CA

Prepared For
U.S. Environmental
Protection Agency, Region 9

Prepared By

Weston Solutions, Inc.
Concord, CA 94520
September 2023

EPA ID No.:

CAN000903324

WESTON Task Order:

12767.900.004.2000.02


-------
IA

Legend

V//A Central Metal Site Boundary

] Sampled Residential Parcel

Residential Sampling Subzone

Residential Sampling Zones

Florence-Firestone Sampling
Zone

Walnut Park Sampling Zone

Notes:

©

Feet

500

FIGURE 10

STAGE 3 RESIDENTIAL SAMPLED
PROPERTY LAYOUT

Central Metal
Site Inspection Report

Huntington Park, Los Angeles County, CA

Prepared For

U.S. Environmental
Protection Agency, Region 9

Prepared By

Weston Solutions, Inc.
Concord, CA 94520
September 2023

EPA ID No.:

CAN000903324

WESTON Task Order:

12767.900.004.2000.02


-------
Parks

Roosevelt Park

CM-BZ-1A
75 mg/kg

70 mg/kg

WPPP

CM-BZ-2A
95 mg/kg

Washington Park

CM-BZ-5A
77 mg/kg

CM-BZ-5B
89 mg/kg

CM-BZ-5C
64 mg/kg

CM-BZ-2A
95 mg/kg

CM-BZ-5

77 mg/kg

CM Parks
81 mg/kg

All BZs
134 mg/kg



3 x Background
401 mg/kg

Road Verges

Garden View

CM-BZ-3
183 mg/kg

Road BZs
186 mg/kg

CM-BZ-4

189 mg/kg

CM-BZ-3A
183 mg/kg

CM-BZ-3B
193 mg/kg

CM-BZ-3C
173 mg/kg

South Gate

CM-BZ-4A
167 mg/kg

CM-BZ4B
183 mg/kg

CM-BZ-4C
217 mg/kg

Notes:

1)	All results in mg/kg (milligrams per kilogram)

2)	BZ = Background Zone

3)	HRS = Hazard Ranking System

FIGURE 11
METHODOLOGY FOR
DETERMINING HRS SCREENING
BENCHMARKS

Central Metal
Site Inspection Report
Huntington Park, Los Angeles County, CA

Prepared For
U.S. Environmental
Protection Agency, Region 9

Prepared By

Weston Solutions, Inc.
Concord, CA 94520
September 2023

EPA ID No.:

CAN000903324

WESTON Task Order:

12767.900.004.2000.02


-------
IA

Legend

\///\ Central Metal Site Boundary

Residential Sampling Subzone

Residential Sampling Zones

¦	1 Florence-Firestone Sampling

'	' Zone

Walnut Park Sampling Zone

Residential Property Lead Results

~ No Lead Exceedance

Exceeded Lead HRS Soil Screening
Benchmark (401 mg/kg)

Notes:

1)	All results in mg/kg (milligrams per kilogram)

2)	ISM average lead results in blue

3)	HRS = Hazard Ranking System

©

Feet

500

FIGURE 12

STAGE 3 RESIDENTIAL SAMPLED
PROPERTY LEAD RESULTS

Central Metal
Site Inspection Report

Huntington Park, Los Angeles County, CA

Prepared For

U.S. Environmental
Protection Agency, Region 9

Prepared By

Weston Solutions, Inc.
Concord, CA 94520
September 2023

EPA ID No.:

CAN000903324

WESTON Task Order:

12767.900.004.2000.02


-------
IA

Legend

Former Central Metal Site
Boundary

Residential Sampling Subzone

Residential Sampling Zones

¦	1 Florence-Firestone Sampling

'	' Zone

Walnut Park Sampling Zone

Residential Property Arsenic
Results

~ No Arsenic Exceedance

I	1 Exceeded Arsenic HRS Soil Screening

'	' Benchmark (22 mg/kg)

Notes:

1)	All results in mg/kg (milligrams per kilogram)

2)	ISM average lead results in blue

3)	HRS = Hazard Ranking System

4)	J = Estimated

©

Feet

500

FIGURE 13

STAGE 3 RESIDENTIAL SAMPLED
PROPERTY ARSENIC RESULTS

Central Metal
Site Inspection Report

Huntington Park, Los Angeles County, CA

Prepared For

U.S. Environmental
Protection Agency, Region 9

Prepared By

Weston Solutions, Inc.
Concord, CA 94520
September 2023

EPA ID No.:

CAN000903324

WESTON Task Order:

12767.900.004.2000.02


-------
HBlb-03



HBla-05



Arsenic: 4.0



Lead: 32



Arsenic: 4.0



Lead: 33 j

HBla-03

Arsenic: 4,7
Lead: 120

T >



. in'



' * m

OUjJ



HBlb-05

Arsenic: 3.3
Lead: 710

HBla-04

Arsenic: 5.3	

Lead: 160

Franklin D.
Roosevelt Park

HBla-02

Arsenic: 3.7
Lead: 22



_

HBlc-05

Arsenic: 4.7
Lead: 61 J

HBlc-04

HBlc-03

Arsenic: 3.5
Lead: 28 J

Arsenic: 3.7
Lead: 140 J

/ Lead: 140.
	 C 11	

	

ISM Subzone: BZlc

HBlc-02

Arsenic: 3.9 mg/kg
Lead: 69 mg/kg

Pll tor

Arsenic: 3.7
Lead: 100



HBlc-Ol

Arsenic: 3.1

Lead: 34

_

HBla-Ol

Arsenic: 4.4|
Lead: 39

ISM Subzone: BZ1

Arsenic: 4.1 mg/kg
Lead: 75 mg/kg

La

psp

(| H

8

s

MIK"

i

M

if.





8

fL

u



J5'f

4

• * ^

3

I	miAthr

Legend

o 4-PC Soil Sampling Location
Central Metal Site Boundary
Background Sampling Subzones
Park Boundaries

Notes:

1)	4-PC = Four-Point Composite

2)	All results in mg/kg (milligrams per kilogram)

3)	J = Estimated

FIGURE 14

STAGE 3 - BZ1
SAMPLING RESULTS FOR
ARSENIC AND LEAD

Central Metal
Site Inspection Report
Huntington Park, Los Angeles County, CA

Prepared For
U.S. Environmental
Protection Agency, Region 9

Prepared By

Weston Solutions, Inc.

Concord, CA 94520
September 2023

w

sW.

EPA ID No.:

CAN000903324

WESTON Task Order:

12767.900.004.2000.02

HBlb-01

Arsenic: 4.2|-
Lead: 56

Arsenic: 4.6|-
Lead: 60

lHBlb-04

Arsenic: 3.5
Lead: 29

Arsenic: 3.7 (Duplicate))
Lead: 30 (Duplicate)

lHBlb-02

|Arsenic: 6.1
Lead: 270

ilISM Subzone: BZlb

^TsenicTJ-3.7 mg/kg

Lead: 69 mg/kg


-------
ISM Subzone: BZ2a

HB2a-02

B T Ih! Ml	f" ill



Lead: 95 mg/kg

1 S *' P Tnf . ^ C3?

— *¦™* -y ¦'	—

HB2a-05

Arsenic

6.4

Lead

200.]

HB2a-03

Arsenic: 3.8
Lead: 90 J

- jmBSSBwrrt-ek.



HB2a-04

Arsenic: 18
Lead: 140 J

	

r-

- Ml

IIR

HB2a-01

Arsenic

4.1

Lead

40 J

Arsenic: 6.1
Lead: 93 J



Legend

o 4-PC Soil Sampling Location
I I Central Metal Site Boundary

Background Sampling Subzones
If^Hl Residential Sampling Subzones

Notes:

1)	4-PC = Four-Point Composite

2)	All results iri mg/kg (milligrams per kilogram)

3)	J = Estimated

FIGURE 15

STAGE 3 - BZ2
SAMPLING RESULTS FOR
ARSENIC AND LEAD

Central Metal
Site Inspection Report
Huntington Park. Los Angeles County, CA

Prepared For
U.S. Environmental
Protection Agency, Region 9

Prepared By

Weston Solutions, Inc.

Concord, CA 94520
September 2023

EPA ID No.:	WESTON Task Order:

CAN000903324	12767.900.004.2000.02


-------
HB3b-04

HB3c-03

Arsenic: 2.4 J
Lead: 170 J

HB3a-03

HB3b-03

Arsenic: 8.6
Lead: 79 J

Arsenic: 6.3
Lead: 160

Arsenic: 18

Arsenic: 15 (Duplicate)
Lead: 220 J

Lead: 180 J (Duplicate)

HB3c-04

Arsenic: 4.7
Lead: 140 J

HB3a-04

HB3c-02

Arsenic: 2.9
Lead: 130

Arsenic: 4.5
Lead: 160 J

HB3b-02

(Arsenic: 40.0
I Lead: 160 J

HB3a-02

HB3c-05

Arsenic: 4.3
Lead: 230

Arsenic: 4.8
Lead: 170 J

HB3a-05

Arsenic: 8.7
Lead: 120

HB3b-05

Arsenic: 4.9
Lead: 140 J

HB3c-01

Arsenic: 2.7
Lead: 99 J

HB3b-Ql

Arsenic: 220
Lead: 1,600 J

HB3a-01

ISM Subzone: BZ3c

Arsenic: 4.4 mg/kg
Lead: 173 mg/kg

[Arsenic: 3.9
Lead: 190

ISM Subzone: BZ3b

Arsenic: 14 mg/kg
Lead: 193 mg/kg

ISM Subzone: BZ3a

Arsenic: 6.6 mg/kg
Lead: 183 mg/kg

Legend

o 4-PC Soil Sampling Location
Central Metal Site Boundary
Background Sampling Subzones

Notes:

1)	4-PC = Four-Point Composite

2)	All results iri mg/kg (milligrams per kilogram)

3)	J = Estimated

FIGURE 16

STAGE 3 - BZ3
SAMPLING RESULTS FOR
ARSENIC AND LEAD

Central Metal
Site Inspection Report
Huntington Park. Los Angeles County. CA

Prepared For
U.S. Environmental
Protection Agency, Region 9

Prepared By

Weston Solutions, Inc.

Concord, CA 94520
September 2023

w

sW.

EPA ID No.:

CAN000903324

WESTON Task Order:

12767.900.004.2000.02


-------
HB4b-03

HB4b-02



»v y

it!

HB4a-02

Arsenic: 6.1
Arsenic: 6.5 (Duplicate)
Lead: 380 J

Lead: 370 J (Duplicate)

HB4c-Q3

Arsenic: 5,4
Lead: 200 J

HB4a-03

HB4C-04

Arsenic: 2.8
Lead: 120 J

Arsenic: 6.4
Lead: 140 J

Arsenic: 55
Lead: 560 J

HB4b-04

Arsenic: 6.9
Lead: 120 J

HB4c-02





Arsenic: 3.2
Lead: 180 J

HB4a-01

Arsenic: 6.4
Lead: 170 J

Arsenic: 4.3
Lead: 200 J

HB4a-04

HB4C-05

Arsenic: 5.7
Lead: 120 J

Arsenic: 4.8
Arsenic: 6.2 (Duplicate)
Lead: 130 J

Lead: 150 J (Duplicate)

IHB4b-05

—Arsenic: 4.6
Lead: 130 J

HB4C-01

HB4b-01

Arsenic: 3.5
Lead: 100 J

Arsenic: 5.1

Ju	/

ISM Subzoiie: BZ4c

Ls CM	Arsenic: 4.4 mg/kg

Lead: 217 mg/kg jC

HB4a-G5

Arsenic: 5.0
Lead: 160 J

' : Ki r S Urn ir

ISM Subzone: BZ4b

Arsenic: 5.3 mg/kg H
Lead: 183 mg/kg An

;—. / m

11MB

ISM Subzone: BZ4c

Arsenic: 7.7 mg/kg
Lread: 167 mg/kg

Legend

o 4-PC Soil Sampling Location
1 | Central Metal Site Boundary

Background Sampling Subzones

Notes:

1)	4-PC = Four-Point Composite

2)	All results iri mg/kg (milligrams per kilogram)

3)	J = Estimated

FIGURE 17

STAGE 3 - BZ4
SAMPLING RESULTS FOR
ARSENIC AND LEAD

Central Metal
Site Inspection Report
Huntington Park. Los Angeles County. CA

Prepared For
U.S. Environmental
Protection Agency, Region 9

Prepared By

Weston Solutions, Inc.

Concord, CA 94520
September 2023

w

sW.

EPA ID No.:

CAN000903324

WESTON Task Order:

12767.900.004.2000.02


-------


r-.

W'-i	'

jm if~ »¦» * 4k1 1

a* f;

v £i,*

if /T

~ijH
¦

¦ • • ' ¦¦

05®, li. jm: UiJtf F 3Jl.. IIJHi

S*

IMi >

HI

S teJr

I Hi n

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t f' ¦ ¦ "ifc Hi TOM

C5 v-

C I

ft !

Ttr't «»

W

x ¦ —II -I# 1

91 i

re », JB&a

SSk«a®»

K.

336

tts

U

•*17^ "Ffc

I M'

«iArviii

I* Rais NiiMl K«l

f'

li»v -f I

lr



!
I

r.. s is £ ¦, '

nr I

"5*

•Sfc^ ¦ 5 ^ f.

w . '>MlUBr -iSai- Hi 4.r *. r « [

*ffr» i_r i"	at—-:



tfC

P

I 3#** ri

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fc-

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ill

1 u.

tA'iHwl

1'"''''"

IKS ' ' .

! - wisnrMslk,;*

hn hi si jr ¦

Notes:

1)	4-PC = Four-Point Composite

2)	All results iri mg/kg (milligrams per kilogram)

3)	J = Estimated

31'

1k



©

Feet

350

m iZSi.i* » ::&Jd$ri

BI

i

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ill



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jls?4*;;

-V , r j V

FIGURE 18

STAGE 3 - BZ5
SAMPLING RESULTS FOR
ARSENIC AND LEAD

Central Metal
Site Inspection Report
Huntington Park. Los Angeles County. CA



M Jfl

IS. jjfe

lrifcai f

s jpr;r#:. i*#1-

i • ' ' X *.«<£> J 3 7_L_LIlv



:

Prepared For
U.S. Environmental
Protection Agency, Region 9

Prepared By

Weston Solutions, Inc.
Concord, CA 94520
September 2023

EPA ID No.:

CAN000903324

WESTON Task Order:

12767.900.004.2000.02


-------
It

«¦

' i 6TL* ^ Jf T^ '' r-j-r	- ' '¦* » ~ jt i, « t. / ij|

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-------
Hill St

Florence-Fin

Nadeau St

E 76th PI

Nadeau

E 77th St

E 78th St

84th St



85th St











E 83rd St

E 84th St
E 85th St

E 81 st i>t

E 83rd

Metro-Firestone

E 87th St

E 92nd St

88th St

E 92nd St

ar pi

Wainut St
California St

c/>
n>
<

>
<

Walnut Park

0
>
<

£
(V
>
c

c

3

o
£

Grs"d Ave
O/ive St

Br°adway
Ct'dahy St

Liberty Blvd

5;

&
¦&

-

H'll St

Santa Ana St

L/faerty Bivd

Ardrnore Ave

Laurel p/

¦'"estone Bird
Willow PI

G/enwood p/

Los Angeles

;V~ '/^JEast Los-Angel

Post <



(1/

4-»

(0

•M

00

South

ern Ave

Stanford Av
Elementary

^everlyRi's^y^

Legend

IXXZ1 Central Metal Site Boundary
~ Background Sampling Subzone
1" II Residential Sampling Subzone
Residential Sampling Zones
Florence-Firestone Sampling
Zone

Walnut Park Sampling Zone
Proximate Industrial Facility

©

Feet

1,400

FIGURE 20
PROXIMATE INDUSTRIAL
FACILITIES MAP

Central Metal
Site Inspection Report
Huntington Park, Los Angeles County, CA

Prepared For
U.S. Environmental
Protection Agency, Region 9

Prepared By

Weston Solutions, Inc.
Concord, CA 94520
September 2023

EPA ID No.:

CAN000903324

WESTON Task Order:

12767.900.004.2000.02


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Central Metal SI Report	September 2023

CAN000903324	APPENDICES

APPENDICES


-------
Central Metal SI Report

CAN000903324

September 2023

APPENDICES

APPENDIX A
ACRONYMS AND ABBREVIATIONS

A-i


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Central Metal SI Report

September 2023

CAN000903324	APPENDICES

%

percent

>

greater than

Hg/L

microgram per liter

|ig/m3

microgram per cubic meter

AOC

area of observed soil contamination

AQMD

Air Quality Management District

BDCM

bromodichloromethane

Bonner

Bonner Analytical Testing Co.

BZ

background sampling zone

CERCLA

Comprehensive Environmental Response, Compensation, and Liability Act of 1980

CLP AS

Contract Laboratory Program Analytical Services

CLRRA

California Land Reuse and Revitalization Act

CMI

Central Metal, Inc.

CPT

Cone Penetrating Testing

CUPA

Certified Unified Program Agency

CVAA

Cold Vapor Atomic Absorption

CWD

County Water District

DCE

dichloroethylene

DMS

Damille Metal Supply Inc.

DP

direct-push

DTSC

Department of Toxic Substance Control

DWP

Department of Water and Power

EJ

Environmental Justice

EPA

U.S. Environmental Protection Agency

e-waste

electronic waste

FRA

former railroad area

ft

feet (foot)

ft2

feet squared (foot squared)

FTMA

former tank manufacturing area

GSWC

Golden State Water Company

HHMD

Health Hazardous Materials Division

HRS

Hazard Ranking System

HWSA

hazardous waste storage area

ICP-MS

Inductively Coupled Plasma Mass Spectrometry

A-l


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Central Metal SI Report

September 2023

CAN000903324	APPENDICES

ICP-AES

Inductively Coupled Plasma Atomic Emission Spectroscopy

ID

Identification

ISM

Incremental Sampling Methodology

ITRC

Interstate Technology Regulatory Council

MCL

Maximum Contaminant Level

mg/kg

milligram per kilogram

mg/L

milligram per liter

MWC

mutual water company

NAICS

The North American Industry Classification System

National Tank

National Tank & Manufacturing Company

NCP

National Contingency Plan

NOV

Notice of Violation

NPL

National Priorities List

PA

Preliminary Assessment

PCE

tetrachloroethylene

PID

photo ionization detector

ppm

parts per million

QA

quality assurance

RCRAInfo

Resource Conservation and Recovery Act Information

RSL

regional screening levels

RWQCB

Regional Water Quality Control Board

RZ

residential sampling zone

SAG

Slauson-Alameda-Gage

SAP

Sampling and Analysis Plan

SEMS

Superfund Enterprise Management System

SI

Site Inspection

SPRR

Southern Pacific Railroad

SQL

Sample Quantification Limit

STLC

Soluble Threshold Limit Concentration

Sub-BZ

background sampling subzone

Sub-RZ

residential sampling subzone

TCE

trichloroethylene

TCLP

Toxicity Characteristic Leaching Procedure

TDL

target distance limit

A-2


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Central Metal SI Report

September 2023

CAN000903324	APPENDICES

TPH

total petroleum hydrocarbons

trans-1,2 DCE

trans I, 2-dichloroethylene

U.S.

United States

USACE

United States Army Corps of Engineers

VISL

vapor intrusion screening level

voc

volatile organic compound

WPPP

Walnut Park Pocket Park

WESTON®

Weston Solutions, Inc.

A-3


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Central Metal SI Report

CAN000903324

September 2023

APPENDICES

APPENDIX B
REMOVAL EVALUATION CONSIDERATIONS

B-i


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Central Metal SI Report

September 2023

CAN000903324

APPENDICES

Appendix B

National Contingency Plan Removal Evaluation Considerations

If the answer to question 1 is "No", or if the answer to any question of 2 through 8 is, '"Yes", the
site is ineligible for CERCLA evaluation and the decision at the bottom of this page is "No
Further Action Under CERCLA". A "yes" answers to questions 9 through 16 identifies sites that
may not be appropriate for CERCLA evaluation without further justification. If a
question cannot be answered, explain why in the Comments section below.

1.

Has a release of hazardous substances, pollutants, or contaminants

occurred?

1 1 Unknown 1X1 Yes

~

No

2.

Docs the release or threat of release consist only of crude oil or
unaltered petroleum product'.'

I | Yes

m

No

3.

Is the site subject to corrective action under RCRA Subtitle C

(hazardous waste treatment, storage, or disposal facility)?

| | Yes

X

No

4.

Does the release or threatened release fall under the jurisdiction of
the Uranium Mill Tailings Radiation Control Act (UMTRCA)?

I | Yes

X

No

5.

Does the release or threatened release fall under the jurisdiction of
the Atomic Energy Act (AEA)?

| | Yes

X

No

6.

Is the release or threatened release a result of a legal application of
pesticides under Federal Insecticide. Fungicide, and Rodenticide Act

(FIFRA)?

I | Yes

X

No

7.

Is the release or threatened release regulated under the Oil Pollution

Act (OPA)?

| | Yes

X

No

8.

Is the release or threatened release permitted under the Nuclear
Regulatory Commission (NRC)?

| | Yes

X

No

9.

Is the site a federal facility?

| | Yes

X

No

10.

Is the site outside of U.S. boundaries?

I ] Yes

X

No

11.

Is the site outside of EP A. Region IX borders?

f-1 Yes

X

No

12.

Is the site within Native American Tribal lands'.'

| | Yes

X

No

13.

Is the site currently under the control and management of a
state/local agency'.' If yes, which agencies'.' Describe below.

1 1 Yes

X

No

14.

Is the site currently operating'.'

1 1 Yes

1X1

No

15.

Is the site address valid'.'

ElYes

~

No

16.

Has the site been investigated under an alias?

1 1 Yes

El

No

Comments:

B-l


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Central Metal SI Report

CAN000903324

September 2023

APPENDICES

APPENDIX C

SITE RECONNAISSANCE INTERVIEW AND OBSERVATION REPORT/
PHOTOGRAPHIC DOCUMENTATION

C-i


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Central Metal SI Report

September 2023

CAN000903324	APPENDICES

SITE RECONNAISSANCE INTERVIEW AND OBSERVATIONS
REPORT/PHOTOGRAPHIC DOCUMENTATION

DATES: April 8 - April 11, 2019 and June 17-20, 2019.

OBSERVATIONS MADE BY: Brian P. Reilly, Weston Solutions, Inc. (WESTON)
SITE: Central Metal (formerly Damille Metals SVC)

EPA ID: CAN000903324

The following information was obtained primarily during the Site Inspection (SI)
sampling efforts, which include the Stage 1 effort in April 2019 and the Stage 2 effort in
June 2019:

The site was located in a mixed industrial and residential area of unincorporated southern
Los Angeles County, immediately southwest of the city of Huntington Park. The site was
signed with the address of 8201 Santa Fe Avenue. The site appeared to be entirely
enclosed behind a combined corrugated metal and chain link fence.

The site was bordered to the north and west by industrial businesses;; to the south by an
industrial recycling business; and to the east by commercial businesses and residential
buildings. The southeastern portion of the site is bordered directly to the northeast by
single-family homes.

During the SI sampling events, the site was generally divided into two operational areas
including the main warehouse-type building and office building portion of the site to the
east, and the mostly vacant portion of the site to the west. A generally northwest-
southeast trending fence divided the two portions of the site.

The facility was occupied by three primary structures including a large warehouse
building at the east-central portion of the site, a single-story office building at the
northeastern corner of the site, and a stormwater treatment system at the southwestern
corner of the site. The warehouse building including several smaller sub-areas within
including a hazardous waste storage area and a maintenance shop at the southern portion
and an aboveground storage tank area at the northern portion.

In addition to the permanent structures, numerous large industrial scrap metal machines,
presumably metal sorters and crushers) were located on the facility, primarily at the
north-central area, the southwestern area, and the central area, immediately west of the
large warehouse building. Several excavators equipped with 'claws' were also located
across the facility. Several large debris piles were observed on the facility during the
events, primarily in the area immediately west of the large warehouse building.

During the Stage 2 event, approximately two dozen large roll-off bins were observed
being stored under cover within the large warehouse building. The bins were of varying
types and sizes and were generally covered by tarps. Placards affixed to some of the bins
indicated that the contained materials were classified as a California hazardous waste
based on concentrations of arsenic, lead, and cadmium.

C-l


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Central Metal SI Report

September 2023

CAN000903324	APPENDICES

The site appeared to be entirely fenced and inaccessible to the public. The main entrance
gates were located at the northeastern portion of the site, immediately west of and
immediately south of the main office building. The surface of the site appeared to be
entirely covered in pavement or buildings. During the Stage 1 and 2 sampling events, the
concrete slab, or slabs in some areas, were found to vary from about 18 to 48 inches in
thickness. No apparent sensitive environments, such as wetlands, were observed on site.
No schools, daycares, or residential buildings were observed within the bounds of the
facility. No stormwater drains were observed on the site and surface water from the site
likely flows from paved areas of the site into the municipal stormwater drains located
along Santa Fe Avenue (east) and Short Street (north) and/or into the subgrade Alameda
Corridor railway (west). No evidence of commercial agriculture, commercial silviculture,
commercial livestock production, or commercial livestock grazing were observed on site.

During the events, the only employees that appeared to regularly work at the facility
included one or two administrative assistants in the office building and between 5 and 10
general maintenance workers across the facility. None of the major equipment at the site
was observed being used and the on-site workers appeared to primarily be repairing
vehicles and/or organizing and inventorying the facility.

C-2


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EH





pK



L



SOLUTIONS

PHOTOGRAPH LOG

Project Name:

Central Metal - Site Inspection

Site Location:

Los Angeles, CA

EPA ID No:

CAN000903324

Photo No.

1

Date:

3/27/2018

Direction Photograph
Taken:

North-Northwest

Description:

Main Office building from
Santa Fe Ave; near
intersection with Short St.

Photo No

2

Date:

3/27/2018

Direction Photograph

Taken:

East

Description:

Main Office building.
Primary facility
entrance gates at
photo-right and photo-
left.

C-3


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EH





pK



L



SOLUTIONS

PHOTOGRAPH LOG

Project Name:

Central Metal - Site Inspection

Site Location:

Los Angeles, CA

EPA ID No:

CAN000903324

Photo No Date:

3 3/27/2018
Direction Photograph
Taken:

South	

Description:

Debris piles located on
western side of
Warehouse building
(former Warehouse
extension building and
foundry area)

Photo No

4

Date:

3/27/2018

Direction Photograph
Taken:

East	

Description:

Uncovered and
uncontained debris piles
located immediately west
ofWarehouse building

C-4


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EH





pK



L



SOLUTIONS

PHOTOGRAPH LOG

Project Name:

Central Metal - Site Inspection

Site Location:

Los Angeles, CA

EPA ID No:

CAN000903324

Photo No

5

Date:

3/27/2018

Direction Photograph
Taken:

North

Description:

interior of Warehouse

building

Photo No.

6

Date:
4/9/2019

Direction Photograph
Taken:

South

Description:

interior of Warehouse
building during Stage 1
event. Note roll-off bins
with mounted placards in
background.

C-5


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EH





pK



L



SOLUTIONS

PHOTOGRAPH LOG

Project Name:

Central Metal - Site Inspection

Site Location:

Los Angeles, CA

EPA ID No:

CAN000903324

Photo No

7

Date:

4/10/2019

Direction Photograph
Taken:

South

Description:

Yard immediately west of
Warehouse building and
Warehouse building
exterior (photo left)

Photo No.

8

Date:
4/10/2019

Direction Photograph
Taken:

Southeast

Description:

Yard immediately west of
Warehouse building and
Warehouse building
exterior Note scalehouse
(since removed) at photo
left.

C-6


-------
PHOTOGRAPH LOG

Project Name:

Central Metal - Site Inspection

Site Location:

Los Angeles, CA

EPA ID No:

CAN000903324

Photo No

9

Date:

4/10/2019

Direction Photograph
Taken:

South

Description:

Mobile laboratory parked
between Warehouse and
Main Office building; used
to analyze soil vapor
samples collected during
Stage 1 event.

Photo No.

10

Date:

4/10/2019

Direction Photograph
Taken:

South

Description:

Advancement of boring
SV-9 (central portion of
site) during Stage 1 SI
event.

C-7


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Central Metal SI Report

CAN000903324

September 2023

APPENDICES

APPENDIX D
CONTACT LOG AND CONTACT REPORTS

D-i


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Central Metal SI Report

September 2023

CAN000903324	APPENDICES

CONTACT LOG

SITE: Central Metal
EPA ID: CAN000903324

NAME

AFFILIATION

PHONE

DATE

INFORMATION

Willow

Los Angeles
County, Office of
the Assessor

(562) 256-1701

05/18/2023

See Contact Report 1

D-l


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Central Metal SI Report



September 2023

CAN000903324

CONTACT REPORT 1

APPENDICES

AGENCY/AFFILIATION: County of Los Angeles

DEPARTMENT: Office of the Assessor, South District Office

ADDRESS/CITY: 1401 E. Willow Street, Signal Hill

COUNTY/ST ATE/ZIP: Los Angeles, California, 90755

CONTACT(S)

TITLE

PHONE

Willow

Assessment Clerk

(562) 256-1701

PERSON MAKING CONTACT: Brian P. Reilly

DATE: 18 May 2023

SUBJECT: Parcel Ownership Information

SITE NAME: Central Metal

EPA ID#: CAN000903324

The current owner and recorded owner address of all nine of the parcels associated with the
Central Metal site (6202-036-009, -010, -011, -012, and -013; and 6202-037-004, -006, -009) as
indicated by the Assessor's Office is: 8201 Santa Fe (CA) LLC, addressed at 2727 North Central
Avenue, 5N; Phoenix, AZ 85004.

D-2


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Central Metal SI Report

CAN000903324

September 2023

APPENDICES

APPENDIX E
TRANSMITTAL LIST

E-i


-------
Central Metal SI Report

CAN000903324

September 2023

APPENDICES

TRANSMITTAL LIST

Date:	September 2023

Site Name: Central Metal
EPA ID No.: CAN000903324



A copy of the Site Inspection (SI) report for the above-referenced site should be sent to the
following recipients:

8201 Santa Fe (CA), LLC

Site Owner

c/o Haley Ziesemer

2727 North Central Avenue, 5N

Phoenix, AZ 85004

Javier Hinojosa

CA Department of Toxic Substances Control
Chatsworth Regional Office
9211 Oakdale Avenue
Chatsworth, CA 91311

Lee Barocas

County of Los Angeles Department of Parks and Recreation

Land Management and Compliance

1000 S. Fremont Avenue

Building A-9 West - Unit #40

Alhambra, California 91803

U.S. Environmental Protection Agency, Superfund Records Center

c/o Matt Mitguard

USEPA - Superfund Division

75 Hawthorne Street, SFD-6-1

San Francisco, CA 94105

E-l


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Central Metal SI Report	September 2023

CAN000903324	ATTACHMENTS

ATTACHMENTS


-------
ATTACHMENT 1
REFERENCES


-------
ATTACHMENT 2
DEBRIS PILE TIMELAPSE


-------
ATTACHMENT 3
SAMPLING AND ANALYSIS PLAN (SAP) - STAGE 1 & 2


-------
ATTACHMENT 4
SAMPLING AND ANALYSIS PLAN (SAP) - STAGE 3


-------
ATTACHMENT 5
SAMPLE NO. - CLP CORRELATION TABLES


-------
ATTACHMENT 6
CPT LITHOLOGICAL PROFILE REPORTS


-------
ATTACHMENT 7
LABORATORY REPORTS - STAGE 1 & 2


-------
ATTACHMENT 8
LABORATORY REPORTS - STAGE 3


-------
ATTACHMENT 9
FIELD SAMPLING LOGBOOK


-------
ATTACHMENT 10
EPA DOCUMENT 540-F-94-028


-------