Exhibit - Due Care Plan_GSD MLK Parcels_20250407 (4).pdf

DUE CARE PLAN

GSD PARK DEVELOPMENT AND EXPANSION – MLK

PARCELS

DETROIT, WAYNE COUNTY, MICHIGAN

Revision 0 April 7, 2025 Prepared for:

U.S. Environmental Protection Agency, Region 5

77 W Jackson Boulevard, Chicago, Illinois 60604 and

City of Detroit Building, Safety, Engineering, and Environmental Department

Environmental Affairs 2 Woodward Avenue, Suite 401

Detroit, Michigan 48226

Submitted by:

Tetra Tech, Inc. Superfund Technical Assessment and Response Team

1 South Wacker Drive, Suite 3700 Chicago, IL 60606

EPA Contract Number: 68HE0519D0005

Task Order – Task Order Line-Item Number (TO-TOLIN): F0107-0001EC260

ACRES Identification Number: 260210

Document Tracking Number: 2588

This project is funded by the Region 5 Targeted Brownfields Assessment (TBA) Program.

Due Care Plan – Revision 0

GSD PARK DEVELOPMENT AND EXPANSION – MLK PARCELS

TO-TOLIN: F0107-0001EC260

Page i

C O N T E N T S

1. Introduction

2. Site Background

2.1. Historical Property Use

2.2. Current and Future Property Use

3. Previous Site Assessments

3.1. Phase I Environmental Site Assessment

3.2. Phase II Environmental Site Assessments

4. Analysis of Exposure and Migration Pathways

4.1. Ingestion of Affected Groundwater

4.2. Migration of Contaminated Groundwater into Surface Water or Sediment

4.3. Direct Contact with Affected Soil

4.4. Inhalation of Affected Particulate and/or Volatilized Compounds

4.5. Summary of Relevant Pathways and Applicable Criteria

5. Hazardous Substance Information and Applicable Criteria

6. Plan for Redevelopment Activities

6.1. Third Party Notifications

6.2. Controls During Redevelopment Activities

6.2.1. Health and Safety Plan

6.2.2. Site Access

6.2.3. Control of Contaminated Material

7. Summary

7.1. Undertake measures to Prevent Exacerbation

7.2. Prevent unacceptable exposure to hazardous substances

7.3. Take Reasonable Precautions Against Third-Party Actions

7.4. Provide Reasonable Cooperation

7.5. Comply with Land Use Restrictions

7.6. Do not Impede Land Use Restrictions

8. References

Page ii

A P P E N D I C E S

Appendix A. Figures Figure 1 — Site Location Map

Figure 2 — Site Layout, ISM Decision Units, Discrete Sample Locations, and RECs – MLK

Parcels

Figure 3 — Soil Samples Exceeding Residential Direct Contact Criteria

Appendix B. TABLES Table B-1 —VOCs in Soil

Table B-2 —PAHs in Soil

Table B-3 — PCBs in Soil Table B-4 — Metals in Soil

Page iii

A C R O N Y M S A N D A B B R E V I A T I O N S

Acronym/Abbreviation Definition

ASTM ASTM International

BEA Baseline Environmental Assessment bgs Below ground surface

City City of Detroit

CFR Code of Federal Regulations

COC Constituent of concern

CREC Controlled recognized environmental condition

DWSD Detroit Water and Sewerage Department

EGLE Michigan Department of Environment, Great Lakes, and Energy

EPA U.S. Environmental Protection Agency

ESA Environmental site assessment

GSD General Services Department

HASP Health and Safety Plan

ISM Incremental Sampling Methodology

MLK Dr. Martin Luther King Jr.

NREPA Natural Resources and Environmental Protection Act

PAH Polycyclic aromatic hydrocarbon

PCB Polychlorinated biphenyl

PIN Parcel identification number

Plan Due Care Plan

REC Recognized environmental condition

START Superfund Technical Assessment and Response Team

TBA Targeted Brownfields Assessment

Tetra Tech Tetra Tech, Inc.

TO-TOLIN Task order – task order line-item number

VEC Vapor encroachment condition

VIAP Volatilization to the indoor air pathway

VOC Volatile organic compound

1 . I N T R O D U C T I O N

Under Contract 68HE0519D0005, Task Order – Task Order Line-Item Number (TO-TOLIN)

F0107-0001EC260, the U.S. Environmental Protection Agency (EPA) Region 5 tasked the Tetra

Tech, Inc. (Tetra Tech) Superfund Technical Assessment and Response Team (START) to prepare a Due Care Plan (Plan) for the General Services Department (GSD) Park Development and Expansion – Dr. Martin Luther King Jr. (MLK) Parcels in Detroit, Wayne County, Michigan.

The GSD MLK Parcel site consists of 22 individual contiguous parcels. The Plan is specific to the

GSD MLK Parcels property (site) (Appendix A, Figure 1). EPA tasked this work through the

Targeted Brownfields Assessment (TBA) Program in response to a request from the City of Detroit

(City).

The 2.01-acre site in the City is slated for redevelopment for active recreational use. Tetra Tech completed a Phase I Environmental Site Assessment (ESA) (Tetra Tech 2024) that identified several recognized environmental conditions (RECs). To confirm or eliminate these RECs, START conducted a Phase II ESA to determine whether contamination was present in soil at the site (Tetra Tech 2025).

The Phase II ESA field investigation included soil sampling according to Incremental Sampling

Methodology (ISM) and collection of soil samples from discrete soil borings. The ISM soil samples were submitted for laboratory analyses for polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and Michigan 10 metals (arsenic, barium, cadmium, chromium, copper, lead, mercury, selenium, silver, and zinc). The discrete soil samples were submitted for laboratory analyses for volatile organic compounds (VOCs), PAHs, PCBs, and Michigan 10 metals. Groundwater was not encountered at the site. VOCs, PAHs, and metals were detected at concentrations above Michigan Department of Environment, Great Lakes, and Energy (EGLE) regulatory criteria.

Because concentrations of constituents of concern (COCs) exceeded EGLE regulatory criteria, the site is classified as a “facility” under Michigan Natural Resources and Environmental

Protection Act Part 201. Section 20107a(1)(a-f) of Part 201 of the Natural Resources and

Environmental Protection Act (NREPA) requires that the owner or operator of a known “facility” must conduct the following tasks:

(a) Undertake measures as necessary to prevent exacerbation.

(b) Exercise due care by undertaking response activities necessary to mitigate unacceptable exposure to hazardous substances, mitigate fire and explosion hazards because of hazardous substances, and allow for the intended use of the facility in a manner that protects the public health and safety.

(c) Take reasonable precautions against reasonably foreseeable acts or omissions of a third party and possible consequences of those acts or omissions.

(d) Provide reasonable cooperation, assistance, and access to persons authorized to conduct response activities at the facility, including cooperation and access necessary for installation, integrity, operation, and maintenance of any complete or partial response activity at the facility. Nothing in this subdivision shall be interpreted to provide any right of access not expressly authorized by law, including access authorized pursuant to a warrant or a court order, or to preclude access allowed pursuant to a voluntary agreement.

(e) Comply with any established or relied on land use or resource use restrictions associated with response activities at the facility.

(f) Do not impede effectiveness or integrity of any land use or resource use restriction at the facility in connection with response activities.

Under Section 20126(3)a of Part 201 of NREPA, the City is not considered liable for contamination at the site as “a local unit of government that acquired ownership or control of a facility involuntarily through bankruptcy, tax delinquency, abandonment, or other circumstances in which the government involuntarily acquires title or control by virtue of its governmental function.” However, because the City’s site redevelopment plans include redevelopment of the property for active recreational use, the City should comply with due care obligations listed under 20107a(1)(a-f).

The City has requested this Plan to outline steps to minimize exacerbation of identified contamination and to mitigate unacceptable exposure of hazardous substances to site workers and nearby residents.

2 . S I T E B A C K G R O U N D

The site is in Detroit, Wayne County, Michigan, and consists of 22 contiguous parcels spanning

2.01 acres. Table 1 below summarizes property identification numbers and addresses.

Table 1 — MLK Parcel Details

Site Total Size Parcel Identification Numbers (PINs) Addresses

MLK Parcels 2.01 acres

08001732, 8001677, 8001678, 8001679, 8007632, 8007633, 8007634, 8007635, 8007636, 8007637, 8007638, 8007639, 8007640, 8007641, 8007643, 8007644, 8007645, 8007646, 8007647, 8001680, 08001681-2, 8007462

1843 W Bethune Ave;

2585, 2589, 2593, and 2599 W Grant Blvd;

7334, 7342, 7350, 7356, 7368, 7376, 7384, 7402, 7408, 7416, 7422, 7430, 7436, 7444, 7450, and 7458 Rosa Parks Blvd

The site is surrounded by residential dwellings, vacant lots, and active and vacant commercial properties. The site is in a mixed commercial and residential use area (Appendix A, Figure 2).

2.1. CURRENT AND FUTURE PROPERTY USE

The northern and central portion of the site is currently vacant, with the southern parcels developed as a park with benches, sidewalks, and landscaped areas. The City plans to redevelop the site as an active recreational park.

2.2. HISTORICAL PROPERTY USE

The site was used for residential, commercial, and industrial purposes after its initial development prior to 1915. Based on historical documentation, residential and commercial buildings were on the site prior to 1915 until the late 1960s when demolition of buildings began. Historical site use included dry cleaning, auto repair, and machining. The site has remained vacant since the late

1960s (Tetra Tech 2024).

3 . P R E V I O U S S I T E A S S E S S M E N T S

START’s previous environmental investigations are summarized below.

3.1. PHASE I ENVIRONMENTAL SITE ASSESSMENT

START completed a Phase I ESA of the site (Tetra Tech 2024) that complied with the All

Appropriate Inquiries Final Rule of 40 Code of Federal Regulations (CFR) Part 312. The Phase

I ESA identified the following RECs, as defined in ASTM International (ASTM) document

E1527-21, titled Standard Practice for Environmental Site Assessments: Phase I Environmental

Site Assessment Process (ASTM 2021):

• REC 1. The property at 7454 12th Street is listed in the Environmental Data Resources, Inc. (EDR) Historical Cleaner database for operations there of Original Carnigie in 1931 and Summit Cleaners in 1956. Possible use of solvents at the property poses a REC and vapor encroachment condition (VEC).

• REC 2. The property at 2593 West Grand Boulevard was occupied by Ingersoll Mlng Mch, based on the 1957 City Directory Report, and thus likely was an industrial property (“milling and machining”). Likely historical use of petroleum and solvents at the property poses a REC.

• REC 3. The property at 1847 Bethune Avenue was listed as an electric and service company in the 1957 and 1962 City Directories. This property appears as a machine shop and factory on the Sanborn map. Possible historical use of petroleum and solvents at the property poses a REC.

• REC 4. The property at 7602 Rosa Parks Boulevard is on the west side of Rose Parks Boulevard, across the street from the site. This property appears as a filling station with gasoline tanks on Sanborn maps. It was listed as E&G Service, likely also an auto repair facility. Its proximity to the site, location upgradient of the site, historical storage of petroleum products there, and likely use of solvents there pose a REC.

• REC 5. The factory at 1834 Bethune Avenue, adjacent to and north of the site, poses a REC because of its proximity to the site, location upgradient of the site, and likely use of petroleum products and solvents there.

• REC 6. The EDR Historical Cleaner database identifies several sites adjacent to the site where activities possibly involved solvents, therefore posing RECs and VECs for the site:

o Ballentine Shop, 7333 12th Street o Ballentine Cleaners Inc., 2577 W Grand Boulevard o Ballentine Cleaners, 7335 12th Street o Aveson Richd, 7515 12th Street o Celeste Cleaners, 2588 W Grand Boulevard o Fronchl Glo Dry Cle, 2570 W Grand Boulevard o Kim David, 7616 12th Street o Hladik Anthony, 7628 12th Street o Kolb Jack, 7600 Churchill Avenue o Sullivan Cleaners, 7606 Churchill Avenue o S T C Amy S Cleaners, 7642 12th Street o Slelly Cleaners, 7642 12th Street.

• REC 7. The EDR Historical Automobile database (EDR HIST AUTO) lists several sites adjacent to the site where activities possibly involved petroleum and solvents, thus posing RECs and VECs for the site:

o Farris Standard Serv (Former Gas Station—also listed in the Baseline Environmental Assessment [BEA] and Michigan Leaking Underground Storage Tank databases), 7541 12th Street o Sterrett and Son Sta, 7541 12th Street o Dicks Friendly Service, 2626 W Grand Boulevard o Lightning Auto Wash, 1832 W Bethune Avenue o Baskin Juli Las, 7602 12th Street.

• REC 8. Stained soil observed during the site reconnaissance on the northern portion of the site poses a REC.

• REC 9. The pile of soil, debris, and concrete observed during the site reconnaissance on the southwestern portion of the site has an unknown origin and may contain petroleum or hazardous substances, and thus poses a REC.

• REC 10. Unknown fill materials may have been imported to the site and used to backfill basements during demolition activities. These unknown fill materials may contain petroleum or hazardous substances, and thus pose a REC.

In addition, one controlled recognized environmental condition (CREC) was identified for the site:

CREC 1: Lexington Village Apartments, at 7507 Rosa Parks Boulevard, is considered a CREC because elevated benzene concentrations are present in soil at that property above the indoor air criterion, and the risk is considered controlled for the interim based on Michigan Part 201.

Because the City would like to redevelop the site for active recreational use, START recommended a Phase II ESA to confirm or eliminate the RECs identified for the site.

Figure 2 in Appendix A is a site layout map that shows identified RECs and previous property uses.

3.2. PHASE II ENVIRONMENTAL SITE ASSESSMENT

To confirm or eliminate the RECs identified during the Phase I ESA, Tetra Tech completed a

Phase II ESA and prepared a report summarizing the findings (Tetra Tech 2025). The MLK

Parcels site was divided up into Decision Units (DU) based on the historical use of the parcel. A total of 13 DUs were developed for purposes of collecting ISM samples. The Phase II ESA field investigation included: drilling and sampling at 13 DUs, collecting ISM samples at nine of the DUs, and drilling and sampling 17 discrete soil borings within the 13 DUs at the site. ISM sampling accorded with EGLE ISM guidance (EGLE 2018). The following sections summarize findings related to assessments of on-site soil:

Each ISM soil sample consisted of 50 increments collected at each DU within depth intervals of

0 to 2 and 2 to 4 feet below ground surface (bgs). Analytes were PAHs, PCBs, and Michigan 10 metals. Laboratory analytical results were compared to EGLE generic soil cleanup criteria for residential soil as specified in EGLE Rule 299.46 for residential cleanup (EGLE 2023) and

Volatilization to Indoor Air Pathway (VIAP) criteria (EGLE 2013). Two replicate samples, MLK-DU14(0-2) and MLK-DU14(2-4), and two triplicate samples, MLK-DU15(0-2) and MLK-

DU15(2-4). were collected for analyses for PAHs, PCBs, and Michigan 10 metals. Analytical results from replicate and triplicate samples varied from results from the parent sample; thus, the highest analyte concentrations detected within DUs should be used for decision making.

Discrete soil samples were analyzed for VOCs, PAHs, PCBs, and Michigan 10 metals, and results were compared to EGLE generic soil cleanup criteria for residential soil as specified in EGLE Rule

299.46 for residential cleanup (EGLE 2023) and EGLE VIAP criteria (EGLE 2013). Soil samples collected within MLK Parcell Identification Number (PIN) 8007632 also were analyzed for formaldehyde, with results compared to the same criteria.

Analytical results from soil samples are summarized in Tables B-1 through B-4 in Appendix B.

Analyte concentrations exceeding EGLE residential criteria are highlighted in the tables. Soil results above EGLE residential direct contact soil criteria are illustrated on Figure 3 in Appendix

A. Because all samples contained fill material, the results were not compared to EGLE Part 201

Default Background Levels or Huron-Erie Glacial Lobe Background Values. Details on soil sample locations and criteria exceeded are in Section 5.

4 . A N A L Y S I S O F E X P O S U R E A N D M I G R A T I O N P A T H W A Y S

Part 201 of the NREPA allows for evaluation of relevant exposure pathways. A pathway is considered relevant when the exposure route exists, even if exposure controls are or will be imposed to prevent exposure, and detected contaminant concentrations are less than applicable criteria. As part of evaluation of a pathway considered relevant, site use and geologic and hydrogeologic characteristics may be considered. Depending on these site-specific factors, certain pathways may be eliminated—that is, such pathways may be determined not relevant and thus not applicable to assessment of risk at the site.

If a pathway is relevant, the corresponding cleanup criteria are applicable to evaluate risk at the site unless the pathway is reliably restricted. Potential pathways of migration and exposure that are considered include:

• Ingestion of affected groundwater

• Migration of contaminated groundwater into surface water or sediment

• Direct contact (including soil ingestion) with affected soil

• Inhalation of affected particulate (soil) and/or volatilized constituents from soil and/or groundwater.

The City’s site plans include redevelopment as an active recreational park. Therefore, in accordance with Part 201 of the NREPA, the appropriate exposure scenarios would be consistent with residential land use. Discussed below are relevance of each residential pathway at the site and a conclusion as to applicability for risk assessment purposes.

Based on EGLE guidance, an exposure pathway is defined as a link between a contaminant source and a receptor (EGLE 2021). Thus, the following sections discuss the potential exposure pathways, presence of a contaminant source, and if the exposure pathway is complete for a receptor.

4.1. INGESTION OF AFFECTED GROUNDWATER

This pathway involves ingestion of drinking water containing contaminants originating from groundwater via dissolution therein or leaching from soil.

Groundwater was not encountered during soil boring activities, and a shallow water-bearing aquifer does not appear to be present in the upper 12 feet of soil at the site. Municipal water is available to the site, and no potable water wells are present on the site or in surrounding areas.

Therefore, this pathway is not relevant to the site and Drinking Water and the Drinking Water

Protection criteria are not applicable.

4.2. MIGRATION OF CONTAMINATED GROUNDWATER INTO SURFACE WATER

OR SEDIMENT

This pathway relates to contaminated groundwater (from dissolution of contaminants therein or leaching from soil) that could migrate to nearby surface water or wetland areas.

Groundwater was not encountered during soil boring activities, and the site is not considered a water-bearing aquifer. No surface water bodies are present at the site, and the nearest surface water body is the Detroit River, more than 3 miles from the site. A hydraulic connection between the site and this surface water body is unlikely. Therefore, this pathway is not relevant to the site, and the Groundwater Surface Water Interface and the Groundwater Surface Water Interface

Protection criteria are not applicable.

4.3. DIRECT CONTACT WITH AFFECTED SOIL

This pathway relates to human dermal contact with or ingestion of contaminated soil. The direct contact with soil pathway is relevant to the site, and Direct Contact criteria are applicable.

4.4. INHALATION OF AFFECTED PARTICULATE AND/OR VOLATILIZED

COMPOUNDS

This pathway relates to inhalation of contaminants volatilizing from the soil, migrating through vadose zone soils, and either venting to the atmosphere or into enclosed spaces (e.g., basements, utility trenches, buildings). This exposure pathway also relates to inhalation of airborne soil particles with adsorbed contaminants.

No COC concentration exceeded EGLE Infinite and Finite (5 meters and 2 meters) Source Volatile

Soil Inhalation criteria or Particulate Soil Inhalation criteria. No contaminant source exists for the inhalation pathway from particulate and/or volatilized compounds; therefore these are not complete pathways for exposure to end users.

The VIAP is relevant at sites where a building is present or planned. No buildings currently are at the site, and no plans for installation of buildings are current. Thus, the VIAP is not a relevant exposure pathway for the site, and VIAP criteria are not applicable to the site

4.5. SUMMARY OF RELEVANT PATHWAYS AND APPLICABLE CRITERIA

Based on the exposure pathway evaluation above, the following residential pathways are considered relevant to assessments of risk and the site:

• Direct contact (including soil ingestion) with affected soil

Soil Direct Contact

5 . H A Z A R D O U S S U B S T A N C E I N F O R M A T I O N A N D A P P L I C A B L E C R I T E R I A

Based on known future uses of the site, concentrations of hazardous substances detected during

START’s Phase II ESA were compared to the EGLE Part 201 of the NREPA residential Cleanup

Criteria for relevant pathways: residential Direct Contact Criteria.

Table 2 summarizes ISM soil sample locations where COCs were detected at concentrations exceeding residential Direct Contract Criteria.

Table 2 — ISM Soil Samples with Confirmed COCs Exceeding EGLE Criteria for Relevant Pathways

Source Exposure Route for Relevant Pathways

ISM Soil Samples with Confirmed COCs Exceeding EGLE Criteria

Soil

Residential Direct Contact Criteria

Benzo(a)pyrene: MLK-DU01(0-2), MLK-DU07(2-4), MLK-DU08(2-4) Arsenic: MLK-DU02(2-4), MLK-DU03(0-2), MLK-DU03(2-4), MLK-

DU06(0-2), MLK-DU07(0-2), MLK-DU07(2-4), MLK-DU08(0-2), MLK-

DU08(2-4), MLK-DU14(0-2), and MLK-DU15(0-2)

Notes:

COC Constituent of concern DU Decision unit EGLE Michigan Department of Environment, Great Lakes, and Energy ISM Incremental Sampling Methodology MLK Dr. Martin Luther King, Jr.

Table 3 summarizes discrete soil sample locations where COCs were detected at concentrations exceeding residential Direct Contract Criteria.

Table 3 — Discrete Soil Samples with Confirmed COCs Exceeding EGLE Criteria for Relevant Pathways

Source Exposure Route for Relevant Pathways

Discrete Soil Samples with Confirmed COCs Exceeding EGLE Criteria

Soil EGLE Residential Direct Contact Criteria

Benzo(a)pyrene: MLK-SB01B(2-4), MLK-SB07(0-2), MLK-

SB07(3-5), MLK-SB08(2-4), MLK-SB13A(0-2)

Lead: MLK-SB07(0-2), MLK-SB09(3-5), MLK-SB13A(2-4) Arsenic: MLK-SB04(0-2), MLK-SB06(0-2), MLK-SB07(0-2), MLK-

SB13A(2-4), MLK-SB13B(0-2)

Notes:

COC Constituent of concern EGLE Michigan Department of Environment, Great Lakes, and Energy MLK Dr. Martin Luther King, Jr.

SB Soil boring

6 . P L A N F O R R E D E V E L O P M E N T A C T I V I T I E S

The City has requested this Plan to outline steps to minimize exacerbation of identified contamination and to mitigate unacceptable exposure of hazardous substances to site workers and nearby residents, acts of third parties, and exposure during redevelopment activities. This section details activities that may be implemented to mitigate potential exposures at the site.

Redevelopment activities described below are based on proposed redevelopment activities for active recreational use. If future use of the property changes, or if a building is constructed on the property, this Plan should be updated, and the City may have additional due care obligations.

6.1. THIRD PARTY NOTIFICATIONS

Reasonable precautions should be taken against acts of a third party via provision of written notice of the general nature and extent of contamination at the site, potential unacceptable exposures to easement holders of existing utilities at the site, and other third parties that may enter the site.

The City may also notify nearby landowners of redevelopment activities and the general nature and extent of contamination at the site via community meetings.

6.2. CONTROLS DURING REDEVELOPMENT ACTIVITIES

This section details activities that may be implemented to mitigate potential exposures to workers and nearby residents during redevelopment.

6.2.1. Health and Safety Plan

A copy of this Plan should be provided to contractors who may be exposed to contaminated soil at the site during planned redevelopment activities. Groundwater was not encountered in the upper 12 feet of soil at the site, and workers are not reasonably expected to encounter groundwater during the planned redevelopment activities. Based on information in this Plan, the contractor is responsible for developing a site-specific Health and Safety Plan (HASP) in accordance with applicable regulatory requirements. The site-specific HASP should outline the necessary measures to protect workers during redevelopment activities. The HASP should be updated as needed throughout the contractor’s activities.

6.2.2. Site Access

During site redevelopment activities, access to the site should be restricted to authorized personnel only.

6.2.3. Control of Contaminated Material

During redevelopment activities, control of contaminated media should be maintained through a dust control program, procedures to address encountered groundwater, and a program to prevent relocation of contaminated soils to other properties or uncontaminated locations.

6.2.3.1. Fugitive Dust Control

A fugitive dust control program should be implemented if soil excavation is planned at the site and conditions are favorable for significant dust generation. If airborne dust/particulates are observed during planned redevelopment activities, management of areas of non-vegetative ground surface, open excavations, stockpiled soils, etc., should occur in a way that mitigates dust generation— for example, by wetting or applying dust suppressants to prevent airborne dispersion and off-site migration of soil particulates.

6.2.3.2. Erosion Controls

Erosion control measures should be implemented to minimize potential runoff of contaminated soils in accordance with applicable state, municipal, or regulatory requirements. Erosion control measures may include gravel tracking mats at work area exits, periodic sweeping and scraping to prevent tracking of soil and dust from the site, and installations of silt fencing around the site perimeter and inlet filters over catch basins.

6.2.3.3. Water Management

Groundwater was not encountered in the upper 12 feet of soil at the site, and encounter with it is not anticipated during planned redevelopment activities. If soil removal occurs, groundwater and/or stormwater may be encountered, which could require dewatering. Water may be discharged directly to the Detroit Water and Sewerage Department (DWSD) sewer after acquisition of the appropriate permits and clearances. If water is to be collected and sent for disposal off site, the water must be characterized prior to disposal to determine how it should be managed. Disposal options may consist of (1) discharge to the DWSD sewer or (2) temporary on-site storage and transport to a licensed off-site disposal facility.

6.2.3.4. Prevention of Tracking Contaminated Soils

Reasonable precautions should be followed to minimize tracking of soil, including imposition of erosion controls to reduce vehicle or equipment tracking of soil and implementation of decontamination procedures for equipment and personnel. If soil is tracked out of the work area or off site, the areas should be cleaned by application of appropriate methods, such as street sweeping.

6.2.3.5. Soil Relocation

Before relocation of any soil on site during redevelopment activities, that soil must undergo evaluation. If evidence of additional soil contamination not previously identified is encountered during redevelopment activities, that soil should be characterized and, if necessary, excavated and sent for disposal at a licensed landfill facility accordingly.

6.2.3.6. Handling of Contaminated Soils Before and During Off-site Transport

Characterized soils to undergo off-site disposal should be directly loaded for transport to a licensed landfill facility or stockpiled on site until off-site transport. A staging area for loading soils should be set up in an area covered by an impervious barrier (concrete) or in an area where similarly contaminated soils are present at the surface. Stockpiled soil should be covered with plastic sheeting or visqueen and bermed around the perimeter to minimize runoff. Off-site soil disposal should be recorded with appropriate documentation, such as manifests, truck logs, lading bills, or other documentation. Site soil to undergo off-site disposal at a regulated disposal facility cannot be moved over roads to off-site locations without proper manifesting and management.

6.2.3.7. Prevention and Mitigation of Future Releases

Hazardous substances used during redevelopment activities at the site likely will include fuel for equipment. Hazardous materials brought onto the site should be properly managed to prevent releases to the environment. Hazardous materials brought onto the site should be stored within secondary containment to prevent spillage into site soils. Hazardous materials storage areas should be properly identified and labeled.

6.2.3.8. Existing Contamination Not Previously Known

Other areas of contamination or contaminants not previously identified in START’s Phase II ESA report may be present at the site. If evidence of previously unknown contamination is encountered, it should be characterized and managed in accordance with EPA and

EGLE requirements.

7 . S U M M A R Y

The City requested this Plan to outline steps to minimize exacerbation of identified contamination and to mitigate unacceptable exposure of hazardous substances to site workers and nearby residents, acts of third parties, and exposure during redevelopment activities. Additionally, the

City must comply with obligations specified under 20107a(1)(a-f) of Part 201 of the NREPA. The

City will satisfy its due care obligations according to the following sections.

7.1. UNDERTAKE MEASURES TO PREVENT EXACERBATION

The City will ensure that the following measures are taken during redevelopment activities, including soil disturbance:

• Dust suppression methods to minimize generation and spread of dust

• Erosion control methods and decontamination procedures to reduce tracking of soil to off-site areas.

7.2. PREVENT UNACCEPTABLE EXPOSURE TO HAZARDOUS SUBSTANCES

Contaminants were detected in the soil at the site at concentrations exceeding residential direct contact criteria, which may pose a threat to human health during active recreational use;

therefore, to mitigate/prevent unacceptable exposures to the soil, the site redevelopment plan should include installation of engineered barriers or excavation and off-site disposal of soil.

Engineered barriers or soil removal are required at soil sample locations where detected concentrations of constituents exceeded residential direct contact criteria, as shown on Figure 3 in Appendix A.

Monitoring and maintenance of engineered barriers is required to ensure that the barriers are protective of human health. Thus, the City should develop an inspection schedule and perform repairs when needed.

Installation and operation of engineered barriers must accord with EGLE guidance for exposure barriers along the direct contact pathway under Part 201 (EGLE 2024).

Because soil samples contained constituents at concentrations exceeding residential VIAP criteria, if a building is constructed on the site, a comprehensive vapor intrusion assessment should be completed, and a building control technology may be required to protect end users from vapor intrusion.

7.3. TAKE REASONABLE PRECAUTIONS AGAINST THIRD-PARTY ACTIONS

Contaminants were detected in the soil at the site at concentrations that may pose a direct contact threat to third parties during recreational use of the site. Thus, engineered barriers or excavation and off-site disposal of soil is necessary to protect third parties from exposure to the site contaminants. In addition, third parties performing soil excavation activities should receive written notice of the general nature and extent of contamination at the site, potential unacceptable exposures to easement holders of existing utilities at the site, and other third parties that may enter the site.

7.4. PROVIDE REASONABLE COOPERATION

No known parties are authorized to conduct response actions at the site outside of the City’s planned redevelopment activities. If the City becomes aware of any such authorized parties, reasonable cooperation will ensue.

7.5. COMPLY WITH LAND USE RESTRICTIONS

There are no known land use restrictions at the site.

7.6. DO NOT IMPEDE LAND USE RESTRICTIONS

There are no known land use restrictions at the site.

8 . R E F E R E N C E S

ASTM International (ASTM). 2021. Standard Practice for Environmental Site Assessments:

Phase I Environmental Site Assessment Process. Method E1527-21.

Michigan Department of Environment, Great Lakes, and Energy (EGLE). 2013. Guidance Document for the Vapor Intrusion Pathway. May.

EGLE. 2018. Incremental Sampling Methodology and Applications, Remediation and Redevelopment Division Resource Materials. January

EGLE. 2021. EGLE Response Activity Plan to Undertake Response Actions to Mitigate Unacceptable Exposures and Achieve Compliance with Section 20107a(a)(b).

February 8.

EGLE. 2023. EGLE Part 201 Generic Cleanup Criteria and Screening Levels for Residential Soil.

October 12.

EGLE 2024. Exposure Barriers for the Direct Contact Pathway Under Part 201. March 20.

Tetra Tech, Inc. (Tetra Tech). 2024. Phase I Environmental Site Assessment. Phase I Environmental Site Assessment, GSD Park Development and Expansion – MLK Parcels, Detroit, Wayne County, Michigan. July.

Tetra Tech. 2025. Phase II Environmental Site Assessment. GSD Park Development and Expansion – MLK Parcels, Detroit, Wayne County, Michigan. April.

Appendix A

A P P E N D I X A . F I G U R E S

Figure 1 — Site Location Map Figure 2 — Site Layout, ISM Decision Units, Discrete Sample Locations, and RECs – MLK Parcels Figure 3 — Soil Samples Exceeding Residential Direct Contact Criteria

F ile

P at h:

G

:\G \G

-S

TA

R T

V \M ic hi ga n\

G S

D P ar k

D ev el op m en t a nd

E xp an si on \G

S D

P ar k D ev el op m en t A rc P

R O

\G S

D P ar k

D ev el op m en t A rc

P R

O .a pr x

Date Saved: 3/19/2025

Michigan

GSD Park Development and Expansion MLK Parcels

Detroit, Wayne County, Michigan

Figure 1 Site Location Map

Prepared For: EPA Prepared By: Tetra Tech Inc.

EPA Contract No.: 68HE0519D0005 TO-TOLIN No.: F0107-0001EC260

2,000 0 2,000

Feet

Source: USGS 7.5-Minute Topographic Quadrangle Map: Detroit, MI 2023

Site Location

Reference Map

Coordinate System: NAD 1983 StatePlane Michigan South FIPS 2113 Feet Datum: North American 1983

Units: Foot US

Site Location

Legend

Approximate Site Boundary

G\ G\

G9

1-S

TA

RT

V\

Mi ch iga n\G

SD

Pa rk De ve lop me nt an d E xp an sio n\m xd \20

-10

\Fi g3

A-

ML

KP

arc els -P rop

ISM

.m xd

Date Saved: 10/18/2024 Coordinate System: NAD 1983 StatePlane Michigan South FIPS 2113 Feet Projection: Lambert Conformal Conic

Datum: North American 1983

Prepared For: US EPA Prepared By: Tetra Tech EPA Contract No.: 68HE0519D0005

200 0 200

Feet

TO/TOLIN: F01070001EC260

Legend Discrete Soil Boring Location

Parcel identified in project info and access form provided Parcel not identified in project info and no access form provided Approximate Site Boundary

BEA = Baseline environmental assessment DU = Decision Unit ISM = Incremental Sampling Methodology MLK = Martin Luther King Parcels REC = Recognized Environmental Condition

GSD Park Development and Expansion MLK Parcels, Bieniek Park, New Puritan Park, and Weaver Extension Parcels Detroit, Wayne

County, Michigan Figure 2

Site Layout, ISM Decision Units, Discrete Sample Locations, and RECs - MLK Parcels

MLK-DU13

MLK-DU12

MLK-DU11

MLK-DU10

MLK-DU09

MLK-DU08

MLK-DU07

MLK-DU06

MLK-DU05 Residential

MLK-DU04

MLK-DU03

Residential

MLK-DU02

MLK-DU01

08001678.

08001679.

08001680.

08001681-2

08001732.

08007647.

08007644.

08007643.

08007646.

08007645.

08007642.

08007641.

08007640.

08007639.

08007638.

08007637.

08007636.

08007635.

08007634.

08007633.

08007632.

08001677.

Grand Service Drive

R osa

P arks B lvd

Lamothe St

Lothrop St

Holden St

W G ra nd B lvd

W Bethune St

W oodrow

W ilson S t

C hurchill S t

SB01A

SB01B

SB02A

SB02B

SB03

SB04

SB05

SB06

SB07

SB08

SB09

SB10A

SB10B

SB12

SB13B

SB13A

SB11

F ile

P at h:

G

:\G \G

-S

TA

R T

V \M ic hi ga n\

G S

D P ar k

D ev el op m en t a nd

E xp an si on \G

S D

P ar k D ev el op m en t A rc P

R O

\G S

D P ar k

D ev el op m en t A rc

P R

O _0

5.

ap rx

Date Saved: 3/31/2025

Figure 3 Soil Samples Exceeding

Residential Direct Contact Criteria

Prepared For: EPA Prepared By: Tetra Tech Inc.

100 0 100

Feet

Reference Map

Coordinate System: NAD 1983 StatePlane Michigan South FIPS 2113 Feet Datum: North American 1983

Units: Foot US

Legend

Discrete Soil Boring Location

Approximate Site Boundary

MLK-DU01

MLK-DU02

MLK-DU03

MLK-DU04

MLK-DU05

MLK-DU06

MLK-DU07

MLK-DU08

MLK-DU09

MLK-DU10

MLK-DU11

MLK-DU12

MLK-DU13, DU14, DU15

Michigan

GSD Park Development and Expansion MLK Parcels

Detroit, Wayne County, Michigan

EPA Contract No.: 68HE0519D0005 TO-TOLIN No.: F0107-0001EC260

Site Location

Notes:

No ISM samples were collected from DUs with red hatchers.

1This is not a property boundary survey. Property boundaries shown on this map are approximate based on existing available information and should not be used to establish property boundaries in the field.

Definitions:

DU Decision unit ISM Incremental sampling methodology MLK Martin Luther King parcels

DU14, DU15

Appendix B

A P P E N D I X B . T A B L E S

Table B-1 —VOCs in Soil Table B-2 —PAHs in Soil Table B-3 — PCBs in Soil Table B-4 — Metals in Soil

Table B-1 VOCs in Soil

GSD Park Development and Expansion - MLK Parcels Detroit, Wayne County, Michigan

Contact Csat

CA

S

N o

Re si de nt ia l

D rin ki ng

W at er

Pr ot ec tio n

Cr ite ria

G ro un dw

Su rf ac e W

In te rf ac e

Pr ot ec tio n Cr ite ria

So il

Vo la til iz at io n to

In do or A ir In ha la tio n

Cr ite ria

In fin ite S ou rc e Vo la til e So il In ha la tio n

Cr ite ria (V

SI

C)

Fi ni te V

SI

C fo r

M et ur ce

Th ic kn es s

Fi ni te V

SI

C fo r

M kn es s

Pa rt ic ul at e

So il

In ha la tio n Cr

Re si de nt ia l

VI

AP

N on re si de nt ia l

VI

AP

D ire ct C on ta ct

Cr ria

So il

Sa tu ra tio n Co nc en tr at io n

Sc re en in g Le ve ls Depth

(Feet)

1,1,1-Trichloroethane (TCA) 71-55-6 4,000 1,800 250,000 3,800,000 12,000,000 28,000,000 67,000,000,000 450 7,500 500,000,000 460,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U 1,1,2,2-Tetrachloroethane 79-34-5 170 1,600 4,300 10,000 10,000 14,000 54,000,000 2.7 150 53,000 870,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U

1,1,2-Trichlorotrifluoroethane (1,1,2- Trichloro-1,2,2-trifluoroethane)

76-13-1

9,000,000 1,700 5,100,000 180,000,000 880,000,000 2,100,000,000 5,100,000,000,000 860 30,000 1,000,000,000 550,000 240 U 270 U 250 U 260 U 260 U 270 U 310 U 280 U 250 U 280 U 1,1,2-Trichloroethane 79-00-5 100 6,600 4,600 17,000 21,000 44,000 190,000,000 0.37 13 180,000 920,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U 1,1-Dichloroethane 75-34-3 18,000 15,000 230,000 2,100,000 5,900,000 14,000,000 33,000,000,000 2.6 150 27,000,000 890,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U 1,1-Dichloroethene 75-35-4 140 2,600 62 1,100 5,300 13,000 62,000,000 12 430 200,000 570,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U 1,2,3-Trimethylbenzene 526-73-8 NS NS NS NS NS NS NS 270 9,600 NS NS 94 U 110 U 98 U 100 U 100 U 110 U 120 U 110 U 100 U 110 U 1,2,4-Trichlorobenzene 120-82-1 4,200 5,900 9,600,000 28,000,000 28,000,000 28,000,000 25,000,000,000 53 1,900 990,000 1,100,000 240 U 270 U 250 U 260 U 260 U 270 U 310 U 280 U 250 U 280 U 1,2,4-Trimethylbenzene 95-63-6 2,100 570 4,300,000 21,000,000 500,000,000 500,000,000 82,000,000,000 150 5,200 32,000,000 110,000 94 U 110 U 98 U 100 U 100 U 110 U 120 U 110 U 100 U 110 U 1,2-Dibromo-3-Chloropropane 96-12-8 10 NS 220 260 260 260 560,000 NS NS 4,400 1,200 240 U 270 U 250 U 260 U 260 U 270 U 310 U 280 U 250 U 280 U 1,2-Dichlorobenzene 95-50-1 14,000 280 11,000,000 39,000,000 39,000,000 52,000,000 100,000,000,000 1,500 52,000 19,000,000 210,000 94 U 110 U 98 U 100 U 100 U 110 U 120 U 110 U 100 U 110 U 1,2-Dichloroethane (EDC) 107-06-2 100 7,200 2,100 6,200 11,000 26,000 120,000,000 0.82 46 91,000 1,200,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U 1,2-Dichloropropane 78-87-5 100 4,600 4,000 25,000 50,000 110,000 270,000,000 2.1 74 140,000 550,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U 1,3,5-Trimethylbenzene 108-67-8 1,800 1,100 2,600,000 16,000,000 380,000,000 380,000,000 82,000,000,000 100 3,600 32,000,000 94,000 94 U 110 U 98 U 100 U 100 U 110 U 120 U 110 U 100 U 110 U 1,3-Dichlorobenzene 541-73-1 170 680 26,000 79,000 79,000 110,000 200,000,000 10 360 200,000 170,000 94 U 110 U 98 U 100 U 100 U 110 U 120 U 110 U 100 U 110 U 1,4-Dichlorobenzene 106-46-7 1,700 360 19,000 77,000 77,000 110,000 450,000,000 23 1,300 40,000 NS 94 U 110 U 98 U 100 U 100 U 110 U 120 U 110 U 100 U 110 U 2-Butanone (MEK) 78-93-3 260,000 44,000 54,000,000 29,000,000 29,000,000 35,000,000 67,000,000,000 31,000 740,000 120,000,000 27,000,000 710 U 800 U 740 U 780 U 770 U 810 U 930 U 830 U 760 U 850 U 2-Hexanone 591-78-6 20,000 NS 990,000 1,100,000 1,100,000 1,400,000 2,700,000,000 210 7,600 32,000,000 2,500,000 2,400 U 2,700 U 2,500 U 2,600 U 2,600 U 2,700 U 3,100 U 2,800 U 2,500 U 2,800 U 4-Methyl-2-pentanone (MIBK) 108-10-1 36,000 NS 37,000,000 45,000,000 45,000,000 67,000,000 140,000,000,000 3,300 40,000 56,000,000 2,700,000 2,400 U 2,700 U 2,500 U 2,600 U 2,600 U 2,700 U 3,100 U 2,800 U 2,500 U 2,800 U Acetone 67-64-1 15,000 34,000 290,000,000 130,000,000 130,000,000 190,000,000 390,000,000,000 260,000 3,100,000 23,000,000 110,000,000 710 U 800 U 740 U 780 U 770 U 810 U 930 U 830 U 290 J 850 U Benzene 71-43-2 100 4,000 1,600 13,000 34,000 79,000 380,000,000 1.7 94 180,000 400,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U Bromoform 75-25-2 1,600 NS 150,000 900,000 900,000 900,000 2,800,000,000 45 2,500 820,000 870,000 94 U 110 U 98 U 100 U 100 U 110 U 120 U 110 U 100 U 110 U Bromomethane 74-83-9 200 100 860 11,000 57,000 140,000 330,000,000 0.9 32 320,000 2,200,000 290 U 330 U 310 U 330 U 320 U 340 U 390 U 350 U 320 U 350 U Carbon disulfide 75-15-0 16,000 NS 76,000 1,300,000 7,900,000 19,000,000 47,000,000,000 52 1,800 7,200,000 280,000 240 U 270 U 250 U 260 U 260 U 270 U 310 U 280 U 250 U 280 U Carbon tetrachloride 56-23-5 100 760 190 3,500 12,000 28,000 130,000,000 0.31 17 96,000 390,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U Chlorobenzene 108-90-7 2,000 500 120,000 770,000 990,000 2,100,000 4,700,000,000 82 2,900 4,300,000 260,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U Dibromochloromethane 124-48-1 1,600 NS 3,900 24,000 24,000 33,000 130,000,000 0.4 55 110,000 610,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U Chloroethane (Ethyl Chloride) 75-00-3 8,600 22,000 2,900,000 30,000,000 120,000,000 280,000,000 670,000,000,000 330 12,000 2,600,000 950,000 240 U 270 U 250 U 260 U 260 U 270 U 310 U 280 U 250 U 280 U Chloroform 67-66-3 1,600 7,000 7,200 45,000 120,000 270,000 1,300,000,000 0.26 15 1,200,000 1,500,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U Chloromethane (Methyl Chloride) 74-87-3 5,200 NS 2,300 40,000 410,000 1,000,000 4,900,000,000 6.9 240 1,600,000 1,100,000 240 U 270 U 250 U 260 U 260 U 270 U 310 U 280 U 250 U 280 U cis -1,2-Dichloroethene 156-59-2 1,400 12,000 22,000 180,000 420,000 990,000 2,300,000,000 2.1 74 2,500,000 640,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U cis -1,3-Dichloropropene 10061-01-5 NS NS NS NS NS NS NS NS NS NS NS 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U Cyclohexane 110-82-7 NS NS NS NS NS NS NS 320 11,000 NS NS 1,100 U 1300 U 1,200 U 1,300 U 1200 U 1300 U 1500 U 1,300 U 1,200 U 1400 U Bromodichloromethane 75-27-4 1,600 NS 1,200 9,100 9,700 19,000 84,000,000 0.61 31 110,000 1,500,000 94 U 110 U 98 U 100 U 100 U 110 U 120 U 110 U 100 U 110 U Dichlorodifluoromethane 75-71-8 95,000 NS 900,000 53,000,000 550,000,000 1,400,000,000 3,300,000,000,000 12 440 52,000,000 1,000,000 94 U 110 U 98 U 100 U 100 U 110 U 120 U 110 U 100 U 110 U Ethylbenzene 100-41-4 1,500 360 87,000 720,000 1,000,000 2,200,000 10,000,000,000 12 680 22,000,000 140,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U Ethylene Dibromide 106-93-4 20 110 670 1,700 1,700 3,300 14,000,000 0.074 4.2 92 890,000 240 U 270 U 250 U 260 U 260 U 270 U 310 U 280 U 250 U 280 U Isopropylbenzene 98-82-8 91,000 3,200 400,000 1,700,000 1,700,000 2,800,000 5,800,000,000 3.8 210 25,000,000 390,000 240 U 270 U 250 U 260 U 260 U 270 U 310 U 280 U 250 U 280 U Methyl acetate 79-20-9 NS NS NS NS NS NS NS NS NS NS NS 1,100 U 1,300 U 1,200 U 1,300 U 1,200 U 1,300 U 1,500 U 1,300 U 1,200 U 1,400 U Methyl tert-butyl ether 1634-04-4 800 140,000 9,900,000 25,000,000 39,000,000 87,000,000 200,000,000,000 74 4,200 1,500,000 5,900,000 240 U 270 U 250 U 260 U 260 U 270 U 310 U 280 U 250 U 280 U

Methylcyclohexane 108-87-2 NS NS NS NS NS NS NS NS NS NS NS 14 J 1,300 U 1,200 U 1,300 U 1,200 U 1,300 U 26 J 25 J 1,200 U 1,400 U Methylene Chloride (Dichloromethane)75-09-2 100 30,000 45,000 210,000 590,000 1,400,000 6,600,000,000 130 4,600 1,300,000 2,300,000 590 U 670 U 610 U 650 U 640 U 670 U 780 U 690 U 630 U 710 U Styrene 100-42-5 2,700 2,100 250,000 970,000 970,000 1,400,000 5,500,000,000 150 8,600 400,000 520,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U Tetrachloroethene (PCE) 127-18-4 100 1,200 11,000 170,000 480,000 1,100,000 2,700,000,000 6.2 150 200,000 88,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U Toluene 108-88-3 16,000 5,400 330,000 2,800,000 5,100,000 12,000,000 27,000,000,000 3,700 64,000 50,000,000 250,000 94 U 110 U 98 U 100 U 100 U 110 U 120 U 110 U 100 U 110 U trans -1,2-Dichloroethene 156-60-5 2,000 30,000 23,000 280,000 830,000 2,000,000 4,700,000,000 12 420 3,800,000 1,400,000 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U trans -1,3-Dichloropropene 10061-02-6 NS NS NS NS NS NS NS NS NS NS NS 47 U 53 U 49 U 52 U 52 U 54 U 62 U 55 U 51 U 57 U Trichloroethene (TCE) 79-01-6 100 4,000 1,000 11,000 25,000 57,000 130,000,000 0.33 8 110,000 500,000 69 53 U 32 J 52 U 52 U 54 U 62 U 55 U 51 U 57 U Trichlorofluoromethane 75-69-4 52,000 NS 2,800,000 92,000,000 630,000,000 1,500,000,000 3,800,000,000,000 19 670 79,000,000 560,000 94 U 110 U 98 U 100 U 100 U 110 U 120 U 110 U 100 U 110 U Vinyl Chloride (Chloroethene) 75-01-4 40 260 270 4,200 30,000 73,000 350,000,000 0.082 16 3,800 490,000 38 U 43 U 39 U 42 U 41 U 43 U 50 U 44 U 41 U 45 U Xylenes, Total 1330-20-7 5,600 980 6,300,000 46,000,000 61,000,000 130,000,000 290,000,000,000 280 9,900 410,000,000 150,000 140 U 160 U 150 U 160 U 150 U 160 U 190 U 170 U 150 U 170 U Formaldehyde 50-00-0 26,000 3,600 12,000 13,000 23,000 52,000 240,000,000 530 73,000 41,000,000 60,000,000 NA NA NA NA NA NA NA NA NA NA

Notes:

Results are in μg/kg Detections are BOLD CAS - Chemical Abstracts Service NA - Not analyzed for this analyte NS - No criterion exists for the analyte Highlighted values exceed criteria for one or more pathways μg/kg - Micrograms per kilogram Csat - Chemical-specific generic soil saturation concentration EGLE - Michigan Department of Environment, Great Lakes, and Energy U - Analyte not detected at concentration above reporting limit J - Result is estimated VOC - Volatile organic compound

Volatilization to Indoor Air Pathway (VIAP)

Criteria Analyte Description

SB01A SB01B

EGLE Residential Soil Criteria

0-2 2-4 0-2 2-4

Boring Location

Groundwater Protection

Ambient AirIndoor Air

SB02A

0-2 3-5

SB02B

0-2 3-5

SB03

0-2 2-4

Page B-1

GSD Park Development and Expansion - MLK Parcels Detroit, Wayne County, Michigan

Contact Csat

CA

S

N o

Re si de nt ia l

D rin ec tio n

Cr ite ria

G ro un dw ac e W rf ac e

Pr ot ec tio n Cr

Vo la til iz at io n to

In do or A ir In ha la tio n

Cr ite ria

In fin ite S ou rc e Vo la til e So il In ha la tio n

Cr ite ria (V te V

SI

C fo r

M kn es s

Fi ni te V

SI

C fo r

M kn es s

Pa rt ic ul at e

So il

In ha la tio n Cr de nt ia l

VI

AP

N on re si de nt ia l

VI

AP

D ire ct C on ria

So il

Sa tu ra tio n Co nc en tr at io n

Sc re en in g Le ve ls Depth

(Feet)

1,1,1-Trichloroethane (TCA) 71-55-6 4,000 1,800 250,000 3,800,000 12,000,000 28,000,000 67,000,000,000 450 7,500 500,000,000 460,000 1,1,2,2-Tetrachloroethane 79-34-5 170 1,600 4,300 10,000 10,000 14,000 54,000,000 2.7 150 53,000 870,000

1,1,2-Trichlorotrifluoroethane (1,1,2- Trichloro-1,2,2-trifluoroethane)

76-13-1

9,000,000 1,700 5,100,000 180,000,000 880,000,000 2,100,000,000 5,100,000,000,000 860 30,000 1,000,000,000 550,000 1,1,2-Trichloroethane 79-00-5 100 6,600 4,600 17,000 21,000 44,000 190,000,000 0.37 13 180,000 920,000 1,1-Dichloroethane 75-34-3 18,000 15,000 230,000 2,100,000 5,900,000 14,000,000 33,000,000,000 2.6 150 27,000,000 890,000 1,1-Dichloroethene 75-35-4 140 2,600 62 1,100 5,300 13,000 62,000,000 12 430 200,000 570,000 1,2,3-Trimethylbenzene 526-73-8 NS NS NS NS NS NS NS 270 9,600 NS NS 1,2,4-Trichlorobenzene 120-82-1 4,200 5,900 9,600,000 28,000,000 28,000,000 28,000,000 25,000,000,000 53 1,900 990,000 1,100,000 1,2,4-Trimethylbenzene 95-63-6 2,100 570 4,300,000 21,000,000 500,000,000 500,000,000 82,000,000,000 150 5,200 32,000,000 110,000 1,2-Dibromo-3-Chloropropane 96-12-8 10 NS 220 260 260 260 560,000 NS NS 4,400 1,200 1,2-Dichlorobenzene 95-50-1 14,000 280 11,000,000 39,000,000 39,000,000 52,000,000 100,000,000,000 1,500 52,000 19,000,000 210,000 1,2-Dichloroethane (EDC) 107-06-2 100 7,200 2,100 6,200 11,000 26,000 120,000,000 0.82 46 91,000 1,200,000 1,2-Dichloropropane 78-87-5 100 4,600 4,000 25,000 50,000 110,000 270,000,000 2.1 74 140,000 550,000 1,3,5-Trimethylbenzene 108-67-8 1,800 1,100 2,600,000 16,000,000 380,000,000 380,000,000 82,000,000,000 100 3,600 32,000,000 94,000 1,3-Dichlorobenzene 541-73-1 170 680 26,000 79,000 79,000 110,000 200,000,000 10 360 200,000 170,000 1,4-Dichlorobenzene 106-46-7 1,700 360…