Tab 14 - Appendix H - Environmental Baseline Survey.pdf

Request for Lease Proposals No. AFCEC-26-R-0003 Page 1 of 1 Davis-Monthan AFB, AZ Appendix H

United States Department of the Air Force

Air Force Civil Engineer Center Installations Directorate

(AFCEC/CI)

Strategic Real Estate Opportunities Davis-Monthan AFB, AZ

Request for Lease Proposals (RFLP) Appendix H

Environmental Baseline Survey

RFLP No. AFCEC-26-R-0003

Davis Monthan Air Force Base, Arizona

Phase I Environmental Baseline Survey:

500 Acre Future Project

Davis Monthan Air Force Base, AZ

January 20, 2026

Phase I Environmental Baseline Survey (EBS) 500 Acre Future Project

Davis Monthan Air Force Base, AZ

355th Civil Engineer Squadron Davis-Monthan AFB 85707

January 20, 2026

Prepared in accordance with Department of the Air Force Instruction (DAFI) 32-7020, Environmental

Restoration Program, Dated March 12, 2020, which implements Air Force Policy Directive 32-70, Environmental Considerations in Air Force Programs and Activities

Executive Summary

The U.S. Air Force (USAF), propose a cooperative effort to use 500 acres of land located within the boundaries of Davis-Monthan Air Force Base for future development opportunities. This EBS is to support the Real Property Transaction what will be needed for the action. The location of the project area is on the East Range at the northeast corner of the installation near the intersection of East Irvington Road and Harrison Road. Figure 2 in Appendix B shows the project area.

E.1 Property Identification

The subject properties are located within the DMAFB installation security perimeter, consisting of approximately 500 acres more or less in total. The legal descriptions for the subject properties are provided in section 1.2 below.

E.2 Site History and Operations

The subject property has been used in the past as the safety zone for the Small Arms Range located on Davis-Monthan AFB. No records are known of any hazardous waste or petroleum spills in this area. A review of cultural resource surveys, that include the project area, identified 4 eligible sites and 8 non-eligible sites within the proposed area.

E.3 Proposed Future Use

The area will be used for future development opportunities.

E.4 Factors Evaluated

The Phase I EBS investigation was conducted in accordance with Department of the Air Force Instruction (DAFI) 32-7020, Environmental Restoration Program, dated March 12, 2020, which implements Air Force Policy Directive 32-70, Environmental Considerations in Air Force Programs and Activities. Procedures documented in DAFI Attachment 3, Environmental Baseline Surveys in Real Property Transactions, were followed during records searches, literature reviews, interviews, site visits, and formulation of conclusions.

Reasonably obtainable documents were reviewed, a visual site inspection was completed, records were requested and reviewed, and interviews were conducted with individuals familiar with the current use and history of the site. Areas evaluated include the following available records and a visual site inspection, land use records, natural resources, cultural resources, contamination.

E.5 Property Categorization

All of the subject property is designated Category 1: An area of real property where no storage, release, or disposal of hazardous substances or petroleum products or their derivatives has occurred into the environment or structures or disposed on the subject property (including no migration of these substances from adjacent properties). IAW DAFI 32-7020, Para A3.3.5.3.

E.6 Findings and Recommendations

No contamination is present, best business practices will be used to reduce the impact to Natural or Cultural Resources present, recommend granting of the permit. A review of cultural resource surveys, that include the project area, identified 4 eligible sites and 8 non-eligible sites within the proposed area. Military Munitions Response Program (MMRP) Site TM554a is located along the north and east border of the project area. Figure #7 is a map showing the location of MMRP TM554a site on DMAFB. TM554a is a buffer area for the Poorman Range Small Arms Complex. If the proposed project is approved TM554a will have to be re-sited once the new range complex is constructed. In March 2021 the U.S. Army Corps of Engineers Omaha District commissioned a report titled “Land Use Control Implementation Plan for Munitions Response Sites TM553, TM553a, and TM554a’, the report provides specific information about the buffer area and possible Contaminants of Concern. In the report it states that during sampling, “One or more metals (i.e., antimony, copper, lead, and zinc) were detected in eight samples; however, they were detected at concentrations less than soil screening levels and/or BTVs during CSE Phase II and RI, Explosives Constituents (EC) were not detected in any of the 12 soil samples analyzed. The concentrations indicate that munitions constituents (MC) do not pose a risk to human health or the environment. Based on the 134 subsurface anomalies investigated with no encounter of munitions and explosives of concern (MEC), the probability of MEC being present on site is less than 0.75 percent (or less than 1 in 134). (U.S. Army Corps of Engineers Omaha District, 2021)

1.0 PURPOSE OF THE ENVIRONMENTAL BASELINE SURVEY

The purpose of this survey is to determine and state the condition of real property controlled by Davis-Monthan AFB to extend a permit for future development opportunities on 500 acres of land located within the boundaries of Davis-Monthan Air Force Base. This report documents the nature, magnitude, and extent of any environmental contamination of property considered for this outgrant. All potential environmental contamination liabilities associated with the subject real property transaction are discussed. The research team that prepared this report has assembled and analyzed sufficient information to assess the health and safety risks and determine that the proposed action will ensure adequate protection of human health and the environmental related to the subject of real property action.

1.1 Boundaries of the Property and Survey Area

A parcel of land consisting of approximately 500 acres, more or less situated in the Parcel 0020 owned by the City of Tucson. Parcel 141-02-0020 consists of approximately 635.8 acres within Section 3, T15S, R15E, G&SRM, Pima County, Arizona, within the boundaries of Davis- Monthan Air Force Base, Arizona.

1.2 Legal description

That part of Section 20, TI 54S, RI 5E, G&SRB&M, in Pima County, Arizona, more fully described as follows:

500 acres located with the following All Exc N75’ 635.08 AC Sec 3-15-15 (Formerly 139- 45-008A).

CONTAINING 635.08 acres more or less.

2.0 SURVEY METHODOLOGY

2.1 Approach and Rationale

The Phase I EBS investigation was conducted in accordance with Department of the Air Force Instruction (DAFI) 32-7020, Environmental Restoration Program, dated March 12, 2020, which implements Air Force Policy Directive 32-70, Environmental Considerations in Air Force Programs and Activities. Procedures documented in the DAFI 32-7020, Appendix 3 (Environmental Baseline Surveys in Real Property Transactions) were followed during records searches, literature reviews, interviews, site visits, and formulation of conclusions.

Reasonably obtainable documents were reviewed, a visual site inspection was completed, records were requested, and interviews were conducted with individual’s familiar with the current use and past history of the site.

2.1.1 Description of Documents Reviewed

The Arizona State Land Parcel Viewer (sco.az.gov/website/parcels/viewer.htm) was used to review current ownership information, in addition to any grazing allotments, mineral leases, or recent sales recorded against the property or properties in the vicinity.

Federal and state databases were accessed to search for any history of hazardous waste storage, use, treatment, or disposal, and similar records for landfills and other regulated substances such as petroleum compounds and polychlorinated biphenyls (PCBs) (EDR 2009c). The database search met the requirements of the Standard Practice for Environmental Site Assessments, E 1527-05, published by the American Society for Testing and Materials.

The Websites and data bases searched include:

ADEQ Hazardous Material Incident Logbook (Covers up to 15 Nov 2001) Website

USCG National Response Home Page

National Response Ctr Query/Download NRC Data Site (Covers 1990-2014) Website

ADEQ Air Quality Program eMap

ADEQ Hazardous Materials Search Website

ADEQ School Bus Idling Program eMap

ADEQ Waste Program eMap

ADEQ Water Quality eMap

EPA Region 9 Superfund Website

USGS Website

USGS EarthExplorer Website

Department of the Interior – BLM – Public Land Survey System (PLSS) Data Base

Arizona State Land Department (ASLD) Parcels Viewer Website

Google Maps Website

USDA Natural Resources Conservation Service Arizona Website

2.1.2 Property Inspections

The objective of the property inspection was to identify any visual or olfactory evidence of environmental conditions in connection with the subject property or adjoining properties to the extent not obstructed by geography, terrain or other obstacles.

355 CES/CEIE staff completed a site visit on 7 January 2026 and did not observe environmental contamination of the property currently the subject of this action. A topo map of the subject property is included in Figure 1 of Appendix B, Figure 2 shows a satellite image of the proposed site. Selected site photographs are included in Appendix C of this report.

2.1.3 Personal Interviews

The following personnel were contacted regarding site history for the subject property:

Patricia Harrimon, 355 CES, Real Property Specialist Sarah Reitmeyer, 355 CES, Air Program Manager Nancy Nesky, 355 CES, Water Program Manager Barbara Long, 355 CES, Natural and Cultural Resources Program Manager

Contact information for personal interviewed during data collection efforts is provided in Appendix E of this document.

2.1.4 Sampling

Sampling of environmental media was not incorporated into the scope of the project. If investigators had suspected that such environmental sampling was warranted, their course of action would have been to notify Davis-Monthan AFB environmental managers for the effort to be handled by others or under a separate task assignment.

3.0 FINDINGS FOR THE SUBJECT PROPERTY

3.1 History and Current Use

3.1.1 Historic

3.1.1 Historic Operations and Land Use

This permit is a new permit. No records are known of any hazardous waste or petroleum spills in this area. There are no cultural resources in this highly disturbed area.

3.1.2 Demolitions

No demolitions have occurred on this property.

3.1.2 Current Operations and Land Use

The subject property is currently used as the safety zone for the small arms range.

3.2 Environmental Setting

The property is in the Tucson Valley between the Tucson Mountains to the west, the Catalina Mountains to the north, the Rincon Mountains to the East, and the Santa Rita Mountains to the south. The Atterbury Wash is in close proximity to the west of the proposed site and is part of the Atterbury Wash Water Shed.

3.2.1 Climate

The Tucson Valley gets on average 11 inches of rain per year. The US average is 37. Snowfall is 1 inch. The average US city gets 25 inches of snow per year. The number of days with any measurable precipitation is 48. On average, there are 286 sunny days per year in Tucson, AZ.

The July high is around 100 degrees. The January low is 38. Our comfort index, which is based on humidity during the hot months, is a 45 out of 100, where higher is more comfortable. The US average on the comfort index is 44. (Climate in Tucson, Arizona, 2014)

3.2.2 Soil

A Natural Resources Conservation Service (NRCS) Custom Soil Resources Report for the area was requested from the NRCS Website, and is included as Figure 2 in Appendix B. The report includes a map with legend of the area and a soil profile of the location. The landform of the area falls into one soil classification; #47 Mohave soils and urban land, 1 to 8 percent slopes. The Typical Soil Profile is A- 0 to 3 inches: loam, BA – 3 to 6 inches: sandy load, Btk – 6 to 40 inches: sandy clay loam, and 2c – 40 to 60 inches: loam. The area falls into the following Farmland Classification: Not Prime Farmland.

3.2.3 Geology

In general, the alluvial deposits present on the tract consist primarily of Quaternary (Pleistocene and Holocene, less than 1 million years old) unconsolidated and semi-consolidated sediments with grain sizes ranging from clays to boulders of granite, granite gneiss, schist, andesite, basalt, rhyolite, sandstone, and limestone.

In ascending order, geologic units occurring under Davis-Monthan AFB include the Pantano Formation; the lower, middle, and upper Tinja Beds; and the Fort Lowell Formation. The Pantano Formation was deposited between 38 and 26 million years before present during times of basin subsidence. The upper Tinja Beds and overlying strata formed as the Tucson Basin began to fill more rapidly than it subsided, and trough-flowing drainage developed. Faults within the Tucson Basin have not been active in historic time. The above strata are present below the subject site at depth (USAF 1990).

3.2.3 Hydrogeology

Groundwater. The Tucson Metropolitan area, including Davis-Monthan AFB, is dependent on groundwater sources for all domestic supplies. Most of the wells on base and nearby tap the Tinja Beds, discussed in the section on geology above, though the Fort Lowell Formation also provides some water. The aquifer is present in interfingering sand, gravel, silt, and clay in these formations. The source strata are approximately 280 to 325 feet below grade in the immediate vicinity of Davis-Monthan. Several ground water monitoring wells as well as producing wells are present on DMAFB. Quality has historically met EPA national Interim Drinking Water Regulations, Secondary Standards (USAF 1990).

Surface Water. The Santa Cruz River drains the Tucson basin with a general flow to the northwest, though at the point nearest the base the flow is virtually due north. The nearest stream which ultimately feeds into the Santa Cruz is the Atterbury Wash. All drainageways, even the Santa Cruz, are dry most of the year and flow only during and soon after storms (USAF 1990).

3.2.4 Topography

Davis-Monthan AFB is in the eastern portion of the Tucson Basin, a 1,000 square-mile broad desert valley. The Tucson Basin is a structural feature filled with alluvium eroded from the surrounding mountains and deposited by ephemeral streams and wind. In general, the deposits consist mainly of Quaternary (Pleistocene and Holocene, less than 10 million years old) unconsolidated and semi consolidated sediments with grain sizes ranging from clays to boulders of granite, granite gneiss, schist, andesite, basalt, rhyolite, sandstone, and limestone.

4.0 PROPERTY CATEGORIZATION

Future actions necessary to address the environmental condition of the property have not been identified as a result of this environmental baseline survey.

4.1 Facility Matrix

Building Facility Identified Conditions

Property Category Code

N/A N/A None identified 1* *Category 1 properties are areas where no storage, release or disposal has occurred; and where no hazardous substances or petroleum products or their derivatives were stored, released into the environment or structures, or disposed on the subject property and where no migration from adjacent areas has occurred.

4.2 Property Categories Map (If More Than One Category)

All of the subject property is designated Category 1. Therefore, no property categories map was prepared.

4.3 Resources Map

Resource inventories are not required by DAFI 32-7020 and were outside the scope of this investigation. No resource map was prepared.

4.4 Data Gaps

No data gaps were identified for the subject property.

5.0 FINDINGS FOR SUBJECT PROPERTY

5.1 Visual Site Inspection (VSI)

Visual site inspection (VSI) was conducted on 7 January 2026 using the Davis Monthan AFB Phase I Environmental Baseline Survey (EBS) Investigation Worksheet and the guidance provided in DAFI 32-7020, Attachment 3, Para A3. 8.. During the site inspection, the Environmental Areas/Factors listed in the following paragraphs were assessed; site photos were taken and are included in Appendix C. While conducting the visual site inspection no issues were identified that would prevent the proposed project from being completed as planned.

5.2 Hazardous Substance Notifications

5.2.1 Storage of Hazardous Substances

Based on historical use of the subject property, and visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of storage of hazardous substances was suspected or observed.

5.2.2 Hazardous Substance Released

Based on historical use of the subject property and visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of hazardous substance release was suspected or observed.

5.2.3 Hazardous and Petroleum Waste

Based on historical use of the subject property and visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of hazardous materials storage and/or petroleum product storage was suspected or observed.

5.3 Petroleum Products and Derivatives

Based on historical use of the subject property and visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of petroleum products or derivatives was suspected or observed.

5.4 Environmental Restoration

5.4.1 Environmental Restoration Program (ERP) Sites

Based on historical use of the subject property, a visual inspection of the site, and records available online from the Arizona Department of Environmental Quality (ADEQ), the Arizona State Land Department (ASLD), and DMAFB, there are no current or former presence of any (ERPs) sites in the proposed project area. Figure #6 shows the location of ERP sites on DMAFB.

5.4.2 Military Munitions Response Program (MMRP) Sites

Based on historical use of the subject property, a visual inspection of the site, and records available online from the Arizona Department of Environmental Quality (ADEQ), the Arizona State Land Department (ASLD), and DMAFB, MMRP Site TM554a is located along the north and east border of the project area. Figure #7 is a map showing the location of TM554a MMRP site on DMAFB. TM554a is a buffer area for the Poorman Range Small Arms Complex. If the proposed project is approved TM554a will have to be re-sited once the new range complex is constructed. In March 2021 the U.S. Army Corps of Engineers Omaha District commissioned a report titled “Land Use Control Implementation Plan for Munitions Response Sites TM553, TM553a, and TM554a’, the report provides specific information about the buffer area and possible Contaminants of Concern. In the report it states that during sampling, “One or more metals (i.e., antimony, copper, lead, and zinc) were detected in eight samples; however, they were detected at concentrations less than soil screening levels and/or BTVs during CSE Phase II and RI, Explosives Constituents (EC) were not detected in any of the 12 soil samples analyzed. The concentrations indicate that munitions constituents (MC) do not pose a risk to human health or the environment. Based on the 134 subsurface anomalies investigated with no encounter of munitions and explosives of concern (MEC), the probability of MEC being present on site is less than 0.75 percent (or less than 1 in 134). (U.S. Army Corps of Engineers Omaha District, 2021)

5.5 Areas of Concern (AOC)

Based on historical use of the subject property, a visual inspection of the site, and records available online from the Arizona Department of Environmental Quality (ADEQ), the Arizona State Land Department (ASLD), and DMAFB, no current or former presence Areas of Concern (AOC) in the proposed construction area.

5.6 Storage Tanks(s)

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the

Arizona State Land Department (ASLD), no current or former presence of above- or underground storage tanks was suspected or observed.

5.6.1 Aboveground Storage Tanks

available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of aboveground storage tanks was suspected or observed.

5.6.2 Underground Storage Tanks

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of underground storage tanks was suspected or observed.

5.6.3 Pipelines, Hydrant Fueling, and Transfer Systems

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of Pipelines, Hydrant Fueling, and Transfer Systems was suspected or observed.

5.7 Oil Water Separators(s)

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of oil/water separators was suspected or observed.

5.8 Grease Trap(s)

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of grease traps was suspected or observed.

5.9 Wash Rack(s)

Based on historical use of the subject property, a visual inspection of the site, and records

Arizona State Land Department (ASLD), one wash rack was observed (appendix C, Picture 11).

5.10 Waste Tank(s)

available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of waste tanks was suspected or observed.

5.11 Pesticides

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), the presence of pesticides was not suspected or observed. Any pesticide usage or application would be IAW all local, state, and federal pesticide application laws and is applied by 355 CES personnel.

5.12 Military Munitions/Ordnance

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), current or former presence of ordnance is suspected.

Munitions debris was observed during the Visual Site Inspection conducted on 7 Jan 2026. See Photo #12. MMRP Site TM554a is located along the north and east border of the project area.

Figure #7 is a map showing the location of TM554a MMRP site on DMAFB. TM554a is a buffer area for the Poorman Range Small Arms Complex. If the proposed project is approved TM554a will have to be re-sited once the new range complex is constructed. In March 2021 the U.S. Army Corps of Engineers Omaha District commissioned a report titled “Land Use Control Implementation Plan for Munitions Response Sites TM553, TM553a, and TM554a’, the report provides specific information about the buffer area and possible Contaminants of Concern. In the report it states that during sampling, “One or more metals (i.e., antimony, copper, lead, and zinc) were detected in eight samples; however, they were detected at concentrations less than soil screening levels and/or BTVs during CSE Phase II and RI, Explosives Constituents (EC) were not detected in any of the 12 soil samples analyzed. The concentrations indicate that munitions constituents (MC) do not pose a risk to human health or the environment. Based on the 134 subsurface anomalies investigated with no encounter of munitions and explosives of concern (MEC), the probability of MEC being present on site is less than 0.75 percent (or less than 1 in 134). (U.S. Army Corps of Engineers Omaha District, 2021)

5.13 Medical or Bio-Hazardous Waste

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of medical or biohazardous waste was suspected or observed.

5.14 Radioactive Waste

available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of radioactive waste was suspected or observed on the proposed site

5.15 Solid/Municipal Waste

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no solid waste was observed on-site, except for designated City of Tucson Municipal Waste Containers (i.e., dumpsters).

5.16 Indoor Air Quality

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no structures were identified or present that would require the assessment of Indoor air Quality, therefore not assessed.

5.17 Groundwater

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), groundwater contamination is not associated with the project area.

5.18 Wastewater treatment, Collection and Disposal/Discharge

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of wastewater treatment collection and discharge was identified or observed.

5.18.1 Storm Water

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no storm water drain was observed during the Visual Site Inspection (VSI).

5.18.2 Septic Tanks and Leach Fields

available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of septic tanks or leach fields was suspected.

5.19 Drinking Water Quality

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of water wells was suspected.

5.20 Utilities (Energy)

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no utility lines were observed during the site visit on 7 Jan 2026.

5.21 Asbestos

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of asbestos was suspected.

5.22 Polychlorinated Biphenyls (PCBs)

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of PCBs was suspected.

5.23 Radon

Based on historical use of the subject property, a visual inspection of the site, and records available online from both the Arizona Department of Environmental Quality (ADEQ) and the Arizona State Land Department (ASLD), no current or former presence of radon was suspected.

5.24 Lead-Based Paint

Arizona State Land Department (ASLD), no current or former presence of lead-based paint was suspected.

5.25 Cultural Resources

5.25.1 Prehistoric Resources

Based on the review of Cultural Surveys available that include the proposed project area, there are 4 eligible sites and 8 not eligible sites within the proposed area. Listed below are the site numbers, the determination for each site, and the report that covers the site.

Figure 5 contains a copy of the DMAFB Archaeological Sites map. During the HDR Inc.

survey they documented 101 isolated finds.

ASM Site Number Determination Report AZ BB:13:878 Not Eligible HDR Inc. March 2016 AZ BB:13:885 Not Eligible HDR Inc. March 2016 AZ BB:13:874 Eligible HDR Inc. March 2016 AZ BB:13:933 Not Eligible SRI Inc. November 2017 AZ BB:13:881 Eligible HDR Inc. March 2016 AZ BB:13:392 Not Eligible SRI Inc. October 1987 AZ BB:13:877 Not Eligible HDR Inc. March 2016 AZ BB:13:882 Eligible HDR Inc. March 2016 AZ BB:13:818 Not Eligible SRI Inc. November 2017 AZ BB:13:880 Not Eligible HDR Inc. March 2016 AZ BB:13:882 Eligible HDR Inc. March 2016

(Copies of the HDR Inc. and SRI Inc. reports are on files in the Cultural Resource Managers’ Office)

5.25.2 Historic Structures and Resources

Based on the review of Cultural Surveys available that include the proposed project area, there is no documented evidence of historic structures on the proposed site.

5.25.3 Paleontological Resources

Based on the review of Cultural Surveys available that include proposed project area, there is no documented evidence of paleontological resources on the proposed site.

5.26 Floodplains

There are no floodplains in the vicinity of the proposed site

5.27 Natural/Biological Resources

Vegetation. Southern Arizona as well as adjacent Mexico which is at relatively low elevation is in a vegetation habitat known as Sonoran Desert scrub. Davis-Monthan AFB includes substantial areas of unimproved land inhabited by native plant communities (approximately 4,741 acres, or about 45 % of the total). The most common native vegetative association in the lower elevations in the region is the creosote bush-bursageis. Other communities interspersed within the larger community include cacti, shrubs and small trees; specifically prickly pear, chollas, saguaro, barrel cactus, white mesquite, palo verde, acacia, and ironwood.

Wildlife. The creosote-bursage vegetative association supports a wide variety of animal life including such species as coyote, jackrabbit, cottontail rabbit, cactus wren, curved bill thrasher, Gambel’s quail, Inca dove, and numerous rodents. Common reptiles indigenous to the base include the regal horned lizard, eastern fence lizard, gopher snake, and western diamondback rattlesnake.

The fact that much of the area is now covered by pavement, with much of the area cleared, has lessened the presence of wildlife, but some common mammals, birds, and reptiles are still present.

5.27.1 Sensitive Habitat

No sensitive habitats have been identified on Davis Monthan Air Force Base.

5.27.2 Threatened and Endangered Species

Although a large number of federally and state-listed threatened, endangered, and status review plant and animal species occur in the vicinity of Davis-Monthan AFB, no evidence has been found to indicate their presence on base. (Status review species are those under study for possible listing.) The Arizona Game and Fish Department routinely conducts surveys on the installation to support the Integrated Natural Resources Management Plan (INRMP) and provide reports to the installation as part of the annual contract. No resident species in the threatened or endangered categories are known on DMAFB, though such species may be present during migrations.

5.27.3 Wetlands

There are no wetlands on Davis-Monthan AFB.

5.27.4 Floodplains

Project area is not within any floodplain boundary.

6.0 APPLICABLE REGULATORY COMPLIANCE ISSUES

6.1 List of Compliance Issues

No compliance issues have been identified as a result of this survey

6.2 Description of Corrective Actions

No needed corrective actions were identified for the subject property.

6.3 Estimates of Various Alternatives

This section is not applicable to the current document.

7.0 FINDINGS FOR ADJACENT PROPERTIES

7.1 Introduction

Records requested from ADEQ, ASLD, and databases searched through the Arizona State Land Parcel Viewer were reviewed and encompassed either a one to four square mile area (or larger) surrounding the subject property to identify occurrences of storage and releases of hazardous materials, hazardous waste, and other regulated substances for nearby properties.

No documents or other evidence was identified in regard to the locations and types of hazardous materials, hazardous waste, or other regulated substances on the subject property.

7.2 Adjacent Environmental Data Resources (EDR) Survey Properties

Nearby land use surrounding the subject property consists of AMARG Aircraft Storage area to the west (on base), small arms safety zone to the south, vacant land to the east that contains the Harrison Greenway bike trail and the Fantasy Island Mountain Bike Trail. To the north is residential development.

7.2.1 Federal Databases: Databases listed in Section 2.2 were reviewed; no findings of concern were identified.

7.2.2 State and Local Databases: Databases listed in Section 2.2 were reviewed; no findings of concern were identified.

7.2.3 Tribal Records: No tribal records were reviewed; no tribes have claimed a tie to the lands located on the base.

7.3 Findings/Impact

The adjacent properties were visually inspected on 7 January 2026. No findings of concern were observed or identified that would indicate presence of environmental contamination on the subject property.

8.0 RECOMMENDATIONS

Based upon the results of the EBS, recommend that the planned permit of the subject property proceed as planned.

9.0 CERTIFICATIONS

Certification of the Environmental Baseline Survey

The 355 CES/CEIE has conducted this Environmental Baseline Survey on behalf of the Air Force. The preparer has reviewed all appropriate records made available and conducted visual site inspections of the selected facilities following an analysis of information during the record search. The information contained within the survey report is based on records made available and, to the best of the preparer’s knowledge, is correct and current as of the date shown below.

Certified by: Date: ______________________

KEVIN L. WAKEFIELD, GS-13, DAFC

Chief, Environmental

Approved by: Date: _______________________

CHRISTOPHER L. BREWSTER, GS-14, PE

Flight Chief, Installation Management

The following specific certifications apply:

HAZARDOUS Substances:

Certification of No Contamination

_____ This real property contains no known hazardous substance as that term is defined in the CERCLA (42 U.S.C. 9601), as amended, or other contamination as specified by the RCRA of 1976, the implementing Environmental Protection Agency regulation (40 CFR parts 261, 262, 263, and 761), and the federal Property Management regulations (41 CFR Part 101-47). A complete search of agency files revealed that no hazardous substances have been stored for more than one year, known to have been released, or disposed of on Air Force-controlled real property described in Section 1.2., Legal Description.

Certification of Contamination

_____ A complete search of agency files has revealed that hazardous substance(s) as that is defined in the CERCLA (42 U.S.C. 9601) as amended, were stored for one year or more, known to have been released, or were disposed of on the excess Air Force controlled real property described in Section 1.2., Legal Description.

Certification of PCB Clearance (Either 1 or 2):

_____ 1. This Real Property is in compliance with 40 CFR 761 as outlined below:

a. An inventory has been prepared and is being maintained of all PCB Real Property installed Equipment and Real Property PCB Items per Section 761.45.

b. All in-service and stored serviceable PCB, PCB contaminated Real Property Installed Equipment and Real Property PCB Items have been inspected, repaired and are being maintained to prevent leakage, therefore can be distributed per Section 761.30.

c. PCB Real Property Installed Equipment and Real Property PCB Items have been stored, decontaminated, and labeled per Section 761.42, 761.43, and 761.44.

d. There is no known PCB contaminated soil, waste, or unserviceable equipment remaining on the existing property.

_____ 2. A records search and an on-site inspection indicate that this property has not been exposed to PCB materials or equipment.

Certification of Other Contaminants: check all that apply and/or list any other known contaminants

_____ Lead Based Paint _____ Asbestos Containing materials _____ Other (please list any other contaminants)

Certified by: Date: ______________________

KEVIN L. WAKEFIELD, GS-13, DAFC

Chief, Environmental

Approved by: Date: _______________________

CHRISTOPHER L. BREWSTER, GS-14, PE

Flight Chief, Installation Management

APPENDIX A

ABBREVIATIONS, ACRONYMS AND KEY TERMS

Abbreviations and Acronyms AFB - Air Force Base AFI - Air Force Instruction AST - Above Ground Storage Tank AZDEQ – Arizona Department of Environmental Quality bgs - Below Ground Surface BTEXN -Benzene Toluene Ethylbenzene Xylenes and Naphthalene CAS - Chemical Abstract Service CERCLA—Comprehensive Environmental Response, Compensation, and Liability Act CFR - Code of Federal Regulations DLA - Defense Logistics Agency EBS - Environmental Baseline Survey ERP – Environmental Restoration Program IRP - Installation Restoration Program MC – Munitions constituents MEC – Munitions and Explosives of Concern MMRP – Military Munitions Response Program MRS – Munitions Response Site PCB - Polychlorinated Biphenyl USACE – United States Army Corps of Engineers UST - Underground Storage Tank VOC - Volatile Organic Compound IRP - Installation Restoration Program PCB - Polychlorinated biphenyl

Terms Acquisition—Any authorized method of obtaining Air Force control of and responsibility for real property. An acquisition may be a temporary or permanent interest in real property. Includes interagency transfers of real property accountability from other Federal government agencies. Methods include purchase, condemnation, donation, exchange, leasing, licenses, permits, revestment and recapture.

Adjacent Properties—Not only those properties contiguous to the boundaries of the installation or subject property, but also those properties relatively nearby that could pose significant environmental impact or concern on the installation or subject property.

Disposal—Any authorized method of permanently divesting the Air Force of control of and responsibility for real property. Includes fee conveyance and interagency transfers or other disposition.

Hazardous Substance—In addition to the meaning provided in CERCLA, 42 U.S.C. 9601(14), this term shall specifically include petroleum, petroleum products, oil, and lubricants (POL).

Outgrant—A temporary grant of an interest in or right to use Air Force controlled real property by means of either a lease, license or permit.

Storage—The holding of hazardous substances for a temporary period prior to the hazardous substances being either used, treated, transported, or disposed of.

Temporary Interest—A grant of interest in or use of real property which expires at the end of a stated term or which can be terminated. Instruments include leases, licenses and permits.

Real Property—Land and fixtures and other improvements affixed thereto.

Release—This term shall have the meaning provided in CERCLA, 42 U.S.C. 9601(22).

APPENDIX H

FIGURES, MAPS, AND SOIL REPORT

Figure 1: USGS 7.5-Minute Quadrangle Map – Tucson East Quadrangle (US Topo Quadrangles - Maps for America)

Figure 2: 2026 Satellite Photograph – Location of 500 Acre Project (Google Maps, 2026)

500 Acre Project

Figure 3, Soil Report, (Soil Surveys, 2025)

Figure 4, DMAFB Archaeological Site Map

Figure 5, DMAFB ERP Site Map

Figure 6, DMAFB MRS Site Map

APPENDIX C

SITE PHOTOS

Photo 1, Example of MRS Sign, located along north and east boundaries of the site.

Photo 2, East boundary with Harrison Greenway bike trail.

Photo 3, Culverts for un-maintained roadway.

Photo 4, Culverts for un-maintained roadway.

Photo 5, OV-1 Mohawk body, used for training.

Photo 6, Roadway, not maintained.

Photo 7, Open grasslands

Photo 8, Vehicle target

Photo 9, MRS Sign, located along north and east boundaries of the site.

Photo 10, Vegetation

Photo 11, UH-1 Iroquois (Huey) Body, used for training.

Photo 12, Expended flare casing

APPENDIX D

REFERENCES

LIST OF DOCUMENTS/DATA SOURCES REVIEWED

(n.d.).

Climate in Tucson, Arizona. (2014). Retrieved July 8, 2015, from Sperling's Best Places:

http://www.bestplaces.net/climate/city/arizona/tucson

Google Maps. (2026, January 6). Retrieved March 5, 2015, from Maps.google.com:

https://maps.google.com/

Soil Surveys. (2025, November 5). Retrieved November 6, 2014, from USDA Natural Resources Conservation Service Arizona:

http://www.nrcs.usda.gov/wps/portal/nrcs/main/az/soils/surveys/

U.S. Army Corps of Engineers Omaha District. (2021). Land Use Control Implementation Plan for Munitions Response Sites TM553, TM553A, and TM554A. Omaha: U.S. Army Corps of Engineers Omaha District.

US Topo Quadrangles - Maps for America. (2026, January 6). Retrieved March 5, 2015, from USGS The National Map US Topo: http://nationalmap.gov/ustopo/index.html

APPENDIX E

INTERVIEWS

Appendix E: Interviews

355th Civil Engineer Squadron (355 CES)

Natural Resources Management, Water/Environmental Restoration Program Management (355 CES/CEIE), Date 8 Jan 2026

Ms. Nancy Nesky, 520-228-4774

1. Are you aware of any groundwater contamination on the subject property?

No, there are no known groundwater contamination issues for the project site.

2. Are there any monitoring wells on or near the subject property?

No, there are no monitoring wells on or near the project area.

Natural Resources Management, Natural Resources and Archeological/Historical/Cultural Resources (355 CES/CEIE), Date 8 Jan 2026

Ms. Barbara Long, 520-228-4035

1. Are you aware of any threatened or endangered species on the subject property?

None has been found on this property.

2. Are you aware of any cultural resources on the subject property?

Yes, there are many cultural sites that are eligible in the proposed location.

Natural resources management, Air Program Management (355 CES/CEIE), Date

8 Jan 2026

Mrs. Sarah Reitmeyer, 520-228-4885

1. Are you aware of any air program issues with the subject property?

No

2. Are you aware if the area is monitored by the Air Force or Pima County?

Yes, by Pima County. Most of the Tucson Metropolitan area is classified as in maintenance for Carbon Monoxide (CO).

Real Property Office (355 CES/CEIA), Date 8 January 2026

Ms. Patricia Harrimon, 520-228-7833

1. What Real Property Instrument will be used for this transaction (license, lease, permit, etc.)?

The type of Real Property Instrument is still to be determined. The land is leased to the USAF from the City of Tucson, the City of Tucson and the developer will have to determine the instrument that will be used.

2. What are the descriptions for the subject properties (Township and Range)?

Legal Description: That part of Section 20, TI 54S, RI 5E, G&SRB&M, in Pima County, Arizona, more fully described as follows:

500 acres located with the following All Exc N75’ 635.08 AC Sec 3-15-15 (Formerly 139- 45-008A).

CONTAINING 635.08 acres more or less.

3. How long has the federal government held title to the subject property?

The land was acquired in 1952.

4. Are you aware of any prior uses of the subject property?

Area has been used for GLCMs (Ground Launch Cruse Missile) Training in the 1980’s and as the safety zone for the small arms range.

5. Are there any other issues you would like to discuss?

None.