LA-01684-03_TOMFPas_PhaseIIESARpt_7-8-2025.pdf

PHASE II

ENVIRONMENTAL SITE ASSESSMENT

PROPOSED PASADENA TRANSIT OPERATIONS AND MAINTENANCE FACILITY (TOMF)

APN: 5746-025-908

2211 EAST WALNUT STREET

PASADENA, CALIFORNIA

File No.: LA-01684-03 Project No.: 306890-002

Prepared For

CITY OF PASADENA

July 8, 2025

Prepared By

Earth Systems Pacific 2122 East Walnut Street, Suite 200

Pasadena, California 91107

(626) 356-0955

July 8, 2025 File No.: LA-01684-03

City of Pasadena Department of Public Works 100 North Garfield Avenue P.O Box 7115 Pasadena, California 91109

Attention: Tiffany Chen

Subject: Phase II Environmental Site Assessment Proposed Pasadena TOMF

APN: 5746-025-908

2211 East Walnut Street Pasadena, California

Presented herewith is the Phase II Environmental Site Assessment Report prepared, as authorized, for the site of a proposed Transit Operations and Maintenance Facility (TOMF) at 2211 East Walnut Street in the City of Pasadena, California. The conclusions and recommendations contained in this report are based upon Earth Systems’ understanding of the proposed parking structure and on analyses of the data obtained from the field and laboratory testing programs.

Earth Systems strives to provide analyses and recommendations in accordance with the applicable standards of care for the environmental engineering and consulting profession at the time the study is conducted. The submittal of this report marks the completion of the scope of environmental services described in Earth Systems’ proposal dated May 28, 2025, and authorized on May 29, 2025. Other services which may be required are additional services that will be billed according to the Fee Schedule in effect at the time such services are provided. Budgets for these services can be provided when requested. Earth Systems appreciates this opportunity to provide professional services for this project. If you need clarification of the information contained in this report, or if Earth Systems can be of additional service, please contact the undersigned.

Respectfully submitted, Earth Systems

Mark L. Russell, P.E.

Project Engineer

Distribution: Tiffany Chen – Tchen@cityofpasadena.net mailto:Tchen@cityofpasadena.net

Project No. 306890-002

TABLE OF CONTENTS

PAGE

INTRODUCTION

SITE DESCRIPTION

SITE HISTORY

ENVIRONMENTAL FIELD EXPLORATION

ANALYTICAL LABORATORY TESTING

SUBSURFACE CONDITIONS

DISCUSSION AND CONCLUSIONS

SOIL-VAPOR

SOIL

RECOMMENDATIONS

LIMITATIONS AND UNIFORMITY OF CONDITIONS

CLOSURE

REFERENCES

TABLES

TABLE 1 Results of Soil Sample Laboratory Analyses - Organics TABLE 2 Results of Soil Sample Laboratory Analyses - Inorganics

PLATES

PLATE I Site Location Map PLATE II Site Exploration Map PLATE III Soil Vapor Survey Findings

APPENDIX A Logs of Previous Test Borings APPENDIX B Soil Vapor Survey Report APPENDIX C Summary of Analytical Laboratory Test Results for Soil Samples

July 8, 2025 File No. LA-01684-03

RESULTS OF PHASE II ENVIRONMENTAL SITE ASSESSMENT

PROPOSED PASADENA TRANSIT OPERATIONS AND MAINTENANCE FACILITY (TOMF)

2211 EAST WALNUT STREET

PASADENA, CALIFORNIA

INTRODUCTION

This report of the results of the Phase II Environmental Site Assessment has been prepared for the site of a proposed Transit Operations and Maintenance Facility (TOMF) at 2211 East Walnut Street in the City of Pasadena, California. The purpose of this study was to evaluate the presence of soil contamination resulting from the past use of the site as an auto body and paint shop. The subject property, along with the adjacent parcel to the north and west, is proposed for redevelopment as a bus facility (transit maintenance operations and maintenance facility – TOMF) which will involve complete demolition and removal of the existing buildings and slabs and removal of approximately 20 feet of soil for proposed subterranean parking.

SITE DESCRIPTION

The approximate half-acre site is located at 2211 East Walnut Street in the City of Pasadena, Los Angeles County, California. The site is approximately a quarter of a mile south of the Foothill (I-210) freeway and approximately two-tenths of a mile north of Colorado Boulevard (Plate I). The rectangular-shaped project site is currently occupied by a former automobile repair and paint shop, which is more recently being used by the Pasadena Department of Public Works as parking and storage. A single-story building is in the northwest quadrant of the site with concrete-paved parking around the perimeter of a building. An outdoor covered area is at the northwest corner of the site.

A below-ground concrete sewer interceptor with three manholes is at the southeast corner of the site between the parking lot wall and the sidewalk. Access to the property is available from East Walnut Street from the south (see Site Location Map and Site Exploration Map, Plates I and II).

Topographically, the property consists of relatively flat ground at an elevation of approximately 776 feet above mean sea level. Site drainage is generally toward the southeast. The above-cited descriptions are intended to be illustrative and are specifically not intended for use as a legal description of the subject property.

July 8, 2025 2 File No.: LA-01684-03

SITE HISTORY

Based on a historical review of site uses from a Phase I Environmental Site Assessment (Phase I ESA), the site was originally developed in approximately 1928, and a portion was occupied by a spur of the Atchinson Topeka & Santa Fe Railroad (Converse Consultants, 2024). In 1968, the site was developed into an auto body repair and paint shop that included the current existing structure on site. In 2022, the auto body repair and paint shop closed, and the City of Pasadena Department of Public Works purchased the site.

The Phase I ESA identified a “recognized environmental condition” (REC) in connection with the historical use and storage of hazardous materials related to the former auto paint shop. The identified RECs for the subject site were: (1) the use of the subject property as an auto body shop and paint shop from as early as 1965 to at least 2022, (2) the historic use of the north adjacent property as a laundry/cleaner in the early 1950s, (3) the historic use of the east adjacent property as an auto repair shop facility from 1937 to at least 1955, (4) the property across the street to the south was identified with a 1,000-gallon UST installed in 1971 and listed as active by the Pasadena Fire Department, (5) database listings for a machine shop and paint center to the south with noted halogenated solvent use.

Earth Systems Pacific (ESP) conducted a geotechnical investigation (report dated February 28, 2025) in support of a proposed maintenance facility at the subject site that will include substantial excavation and a subterranean parking area. Exploration for that investigation included three borings (B10 to B12) to a maximum depth of 50 feet below existing grade, which exposed native alluvial soil. Infiltration testing was completed in boring B10 at a depth of 20 to 50 feet. No soil staining, odors, or other obvious signs of soil contamination were observed in the geotechnical exploration borings. The logs of those borings are included in Appendix A of this report and the locations are plotted on the attached Site Exploration Map (Plate II).

At the time of Earth Systems’ site visit to begin the environmental assessment on June 11, 2025, Earth Systems measured depth of the sewer interceptor at the southeast corner of the site as 5.5 feet below the cover or approximately 6.5 feet below grade. At that time, the covered area in the northwest corner of the property contained some materials of potential concern. Two 55-gallon steel drums with hazardous waste labels, paint cans, rags, buckets, and stained concrete pavement were observed, and much of the area was covered in pine needles and pine cones from the adjacent tree. Those materials were all removed by the City of Pasadena prior to the field exploration on June 16, 2025.

ENVIRONMENTAL FIELD EXPLORATION

The field exploration for this environmental site assessment was conducted on June 16, 2025. Field exploration consisted of sampling twelve exploratory direct push test holes (TH1 through TH12) to depths of approximately one to eight and a half feet below the existing ground surface. The direct

July 8, 2025 3 File No.: LA-01684-03 push test holes do not produce soil cuttings or allow visible soil samples, and boring logs were not prepared. The logs of the previous geotechnical borings are provided herein for reference as mentioned above. The approximate locations of the exploratory test holes, as indicated on the attached Site Exploration Map (Plate II), were determined by sighting and tape measuring from existing surrounding improvements. The locations of the test holes should be considered accurate only to the degree implied by the measurement method used.

A soil vapor (soil-gas) survey was conducted by Optimal Technology to screen for possible chlorinated solvents and aromatic hydrocarbons in the subsurface. Soil vapor samples were collected and analyzed on site in a mobile laboratory using a gas chromatograph/purge and trap system in accordance with USEPA Modified Method 8260B. A total of 17 vapor samples were collected from 12 locations. Soil sampling locations and depths were then selected partially based on the soil vapor data obtained on site.

Soil samples were recovered in 3/4-inch diameter stainless steel sleeves that were direct-pushed into the ground using Optimal Technology Direct Push probes in accordance with USEPA method 5035.

Recovered soil samples were sealed and transported on ice to a California-certified laboratory under chain-of-custody documentation. As a quality control measure, a duplicate of the soil sample TP6 at 2 feet was collected and sent for laboratory testing along with the other samples.

The laboratory analytical results of soil vapor are included in Appendix B and a summary of results is included in the attached Soil Vapor Findings Map (Plate III). The results of laboratory analytical testing on soil samples are included in Appendix C.

ANALYTICAL LABORATORY TESTING

Chain of custody procedures were utilized for all soil samples collected by Earth Systems to ensure sample integrity and to document sample possession from the time of collection to the final destination. Soil samples were placed on ice and delivered under chain of custody documentation to a California state-certified environmental analytical laboratory.

A total of seventeen (17) soil samples were collected by Earth Systems’ and analyzed for the following:

• Total Petroleum Hydrocarbons (TPH) by EPA Method 8015M – hydrocarbon chain range from C6 to C44.

• Volatile Organic Compounds (VOCs) by EPA Method 8260B

• Title 22 Metals (CAM 17) by EPA Method 6010B/7174A

Tables 1 through 2 (attached) provide a summary of soil laboratory results. Refer to Appendix B for the soil vapor survey report and Appendix C for the complete soil laboratory reports and chain of custody documents.

July 8, 2025 4 File No.: LA-01684-03

SUBSURFACE CONDITIONS

Based on the geotechnical borings, artificial fill soils are present across the site to a depth of approximately 7.5 feet. These fill soils were found to consist predominantly of medium stiff to hard sandy silt (ML soil type based upon the Unified Soil Classification System).

Native soils comprised of alluvium (Qa) were found to consist predominantly of medium dense to very dense silty sand and well-graded sand (SM and SW soil types). The logs of the test borings in Appendix A contain more detailed descriptions of the soils encountered.

Free groundwater was not encountered to the maximum depth explored. The nearest well monitored by the Los Angeles County Department of Public Works (LACDPW) is well #4095 (located approximately one tenth of a mile east of the subject site at a ground elevation of 758.6 feet above mean sea level). Groundwater was most recently measured in this well at a depth of 348 feet (April 21, 2006). Based on the Seismic Hazards report for the Mount Wilson Quadrangle (CDMG, 1998), the historic shallowest groundwater in the vicinity of the project site is approximately 100 feet below grade. Fluctuations in groundwater levels may occur due to variations in rainfall, regional climate, and other factors.

DISCUSSION AND CONCLUSIONS

Soil-Vapor

Multiple soil vapor (soil-gas) samples showed levels of volatile organic compounds (VOCs) above the reporting limit, primarily perchloroethylene, PCE (aka perchloroethylene, tetrachloroethene) with concentrations up to 683 ug/m3 and trichloroethylene, TCE (aka trichloroethene) with concentrations up to 35 ug/m3. One soil vapor sample showed detectable levels of ethylbenzene at 212 ug/m3 and total petroleum hydrocarbons as gasoline (TPH-g) at 8,847 ug/m3. A summary of soil-vapor results is included in Plate III and a complete table of results is included in Appendix B. Some of the PCE soil-vapor results exceed the State of California (Cal Water Boards, 2019) environmental screening levels (ESL) for sub-slab soil gas in commercial/industrial for various constituents.

Soil-Vapor ESLs and Max Detected Concentrations

Subslab Soil-Gas ESL (ug/m3) Maximum Site Concentration (ug/m3)

Constituent Cancer Non-Cancer

Tetrachloroethylene (PCE) 67 5,800 683

Trichloroethylene (TCE) 100 290 35

Ethylbenzene 160 150,000 212

July 8, 2025 5 File No.: LA-01684-03

The PCE and TCE found in soil-vapor are likely related to the past use of the north adjacent property as a laundry/cleaner in the early 1950s, as indicted in the Phase I ESA (Converse 2024). The TPH and Ethylbenzene found in soil-vapor are likely related to the used oil drums and slab staining in the northwest corner of the site. Oil changes and other auto maintenance work at that location likely resulted in some spills that impacted the soil-vapor but were not heavy enough to result in detectable amounts in the soil samples.

Soil

Volatile organic compounds (VOCs) and total petroleum hydrocarbons (TPH) were identified by the laboratory testing in eight of the 16 soil samples. However, the VOCs found in the soil-vapor samples (PCE, TCE, and Ethylbenzene) were not detected in any of the soil samples. The VOC’s found in soil samples were Acetone, Chloroform, and Styrene which were detected at levels well below the ESLs for construction worker exposure and commercial-industrial shallow soil exposure set by the State of California (Cal Water Boards, 2019). Levels of TPH (C6 to C44 range) and diesel range organics (DRO; C10 to C28 range) were detected significantly below the ESLs for construction worker exposure and commercial-industrial shallow soil exposure.

Various CAM 17 metals were detected in site soil; however, concentrations are generally below the California ESLs and can be considered near natural (background) levels. One sample showed Nickle at a concentration (475 mg/kg) exceeding the non-cancer ESL. Other than that, Arsenic is the only metal detected above the ESL (0.98 to 2.0 mg/kg). Arsenic was detected in 13 of the 16 soil samples at concentrations ranging from 2.94 to 11.3 mg/kg. Studies by the California Department of Toxic Substances Control (DTSC) indicate that naturally occurring arsenic can be found in soils ranging from 2 to 21 mg/kg compared to artificial fill soils ranging from 0.7 to 49 mg/kg across various sites in Southern California (Behrsing et al., 2018). Their data suggests that the Arsenic concentrations found at the subject site are within the range of the commonly occurring background levels of Arsenic in Southern California.

In summary, the site soil within approximately 2 to 8.5 feet depth has concentrations of TPH, VOCs and heavy metals at generally low concentrations relative to the California ESLs for construction worker exposure. Arsenic was detected above the ESLs, however, the concentrations are within the range of previously detected naturally occurring levels in southern California. The depth, gradient, and/or quality of groundwater beneath the site has not been addressed. Based on these results and the proposed project to remove approximately 20 feet of soil, further site assessment is not recommended at this time. For disposal of excavated soil to be hauled off-site, the landfill or other receiving location may require additional soil sampling and testing.

July 8, 2025 6 File No.: LA-01684-03

RECOMMENDATIONS

Based upon the results of the field exploration and laboratory testing described herein and review of available reports of previous environmental investigations for this site, the area of impacted soil appears to be adequately characterized.

The impacted soil beneath the building will be disturbed during site excavation and grading so environmental monitoring during excavation is recommended. Environmental monitoring typically involves visual observation by qualified personnel along with screening for VOCs using hand-held instrumentation.

The VOCs detected in soil-vapor could pose a long-term risk to site workers. So, a vapor-intrusion barrier (such as Drago WrapTM or similar) is recommended beneath the lower-level floor slab and behind the retaining walls. The vapor intrusion barrier may potentially be combined with proposed project waterproofing and moisture barriers. A vapor intrusion and waterproofing professional should be consulted regarding that aspect of the design.

LIMITATIONS AND UNIFORMITY OF CONDITIONS

This report has been prepared for the exclusive use of the City of Pasadena Department of Public Works. The conclusions rendered in this report are opinions based on readily available information obtained within the scope of the work authorized by the City of Pasadena Department of Public Works. Use of, or reliance on, the information and opinions contained in this report by other parties without first consulting this office is at those parties' own risk.

The results contained in this report are based upon the information acquired during this assessment.

It is possible that variations could exist beyond or between points observed during the course of this assessment. Also, changes in observed conditions could occur at some time in the future due to works of man, contamination migration, variations in rainfall, temperature, and/or other factors not apparent at the time of the field investigation.

It should be noted that any level of assessment cannot ascertain that a property is completely free of chemical or toxic substances; therefore, Earth Systems cannot offer the certification of a “clean” site. The services provided by Earth Systems have been conducted in a manner consistent with the level of care and skill ordinarily exercised by members of our profession currently practicing under similar conditions in this area of California. No warranty is expressed or implied.

July 8, 2025 7 File No.: LA-01684-03

CLOSURE

Earth Systems trusts this report is sufficient at this time and meets your current needs. Earth Systems appreciates this opportunity to provide professional environmental consulting services for this project. If you have any questions regarding the information contained in this report, or if you require additional environmental or geotechnical engineering services, please contact the undersigned.

Respectfully submitted, Earth Systems

Linda Pineda Mark L. Russell, P.E.

Project Geologist Project Environmental Engineer

END OF TEXT

REFERENCES

PLATES

APPENDICES

July 8, 2025 8 File No.: LA-01684-03

REFERENCES

American Society for Testing and Materials (ASTM), 2019, Standard Practice for Environmental Site

Assessments: Phase II Environmental Site Assessment Process, Standard E1903.

Berhsing, T; Davis, B.; Wade, M., Eichelberger, J., 2018, When Background Risks are Important:

Metals in Soil.

California Water Boards, 2019, Environmental Screening Levels: San Francisco Bay Regional Water

Quality Control Board (RWQCB), Summary of Soil ESLs (mg/kg).

Converse Consultants, 2024, Phase I Environmental Site Assessment Report, 2211 East Walnut Street, Pasadena, California, Project No.: 22-41-166-01, dated June 28, 2024.

Earth Systems Pacific, 2025, Preliminary Geotechnical Engineering Report, Proposed Transit

Operations and Maintenance Facility (TOMF), APN: 5746-025-907 and -908, 2180 East Foothill Boulevard and 2211 East Walnut Street, Pasadena, California, File No.: LA-01684-02, Project No.:

22-41-166-01, dated February 28, 2025.

TABLES

TABLE 1 Results of Soil Sample Laboratory Analyses - Organics TABLE 2 Results of Soil Sample Laboratory Analyses - Inorganics

LA-01684-03

306890-002

July 8, 2025

TOMF Pasadena

Table 1. Results of Laboratory Analyses for Organic Compounds in Soil Samples

TH1 TH1 TH2 TH2 TH3 TH4 TH4 TH5 TH6 TH7 TH9 TH9 TH10 TH10 TH12 TH12 Dup1

2 8.5 2 8.5 2 2 5 2 2 2 2 5 2 5 2 5 -

Analyte Test Method Units Cancer Non-Cancer Cancer Non-Cancer

Petroleum Hydrocarbons

TPH (C6-C44) EPA 8015C (M) (mg/kg) NL 54000 NL 180000 180 340 ND(<25) 34 ND(<25) ND(<24) ND(<24) 35 ND(<25) ND(<25) ND(<25) 47 ND(<25) ND(<25) ND(<25) ND(<23) ND(<25)

Diesel Range (C10-C28) EPA 8015C (M) (mg/kg) NL 1100 NL 1200 49 110 ND(<4.9) 13 ND(<5) ND(<4.8) ND(<4.8) 18 ND(<4.9) ND(<4.9) ND(<4.9) 9.6 ND(<4.9) ND(<5) ND(<4.9) ND(<4.7) ND(<4.9)

Volatile Organic Compounds (VOC's)

Acetone EPA 8260D (ug/kg) NL 270000 NL 670000 19 ND(<19) ND(<20) ND(<20) ND(<19) ND(<20) ND(<19) ND(<19) ND(<19) ND(<20) ND(<19) ND(<20) ND(<20) ND(<19) ND(<19) ND(<20) ND(<20)

Chloroform EPA 8260D (ug/kg) 34 860 1.4 1000 1.2 1.6 1.9 1.3 1.5 ND(<0.99) 1.1 ND(<0.97) ND(<0.95) 1.1 ND(<0.97) ND(<0.99) ND(<0.98) ND(<0.97) 1.1 ND(<0.98) ND(<0.99)

Styrene EPA 8260D (ug/kg) NL 25000 NL 33000 5.4 ND(<0.97) ND(<0.98) ND(<0.98) ND(<0.96) ND(<0.99) ND(<0.96) ND(<0.97) ND(<0.95) ND(<0.99) ND(<0.97) ND(<0.99) ND(<0.98) ND(<0.97) ND(<0.97) ND(<0.98) ND(<0.99)

Other VOC's EPA 8260D (ug/kg) -- -- -- -- ND(<1-19) ND(<1-19) ND(<1-20) ND(<1-20) ND(<1-19) ND(<1-20) ND(<1-19) ND(<1-19) ND(<1-19) ND(<1-20) ND(<1-19) ND(<1-20) ND(<1-20) ND(<1-19) ND(<1-19) ND(<1-20) ND(<1-20)

ESL (CW) = California EPA Environmental Screening Level for Soil, Construction Worker: Any Land Use/Any Depth Soil Exposure Case (San Francisco RWQCB, 2019).

ESL (CI) = California EPA Environmental Screening Level for Soil, Commercial/Industrial: Shallow Soil Exposure Case (San Francisco RWQCB, 2019).

NL = Chemical currently not listed for ESL by Cal EPA.

ND = not detected

NT = not tested

RL = Laboratory reporting limit mg/kg = milligrams of constituent per kilogram of soil ug/kg = micrograms of constituent per kilogram of soil

ESLs (CW) ESLs (CI)

Location:

Depth (feet):

July 8, 2025 LA-01684-03

306890-002

TOMF Pasadena

Table 2. Results of Laboratory Analyses for Inorganic Compounds in Soil Samples

TH1 TH1 TH2 TH2 TH3 TH4 TH4 TH5 TH6 TH7 TH9 TH9 TH10 TH10 TH12 TH12 Dup1

2 8.5 2 8.5 2 2 5 2 2 2 2 5 2 5 2 5 -

Analyte Test Method Units Cancer Non-Cancer Cancer Non-Cancer

Title 22 Metals

Antimony EPA 6010B (mg/kg) NL 50 NL 160 ND(<9.55) ND(<9.61) ND(<9.79) ND(<8.90) ND(<9.55) ND(<8.79) ND(<9.44) ND(<9.66) ND(<9.80) ND(<9.82) ND(<9.73) ND(<9.24) ND(<9.75) ND(<9.91) ND(<8.48) ND(<9.32) ND(<9.53)

Arsenic 6010B/ 6020 (mg/kg) 2.0 0.98 0.31 3.6 7.64 7.15 4.58 6.68 2.94 4.09 3.23 11.3 3.69 3.57 ND(<2.92) 3.68 ND(<2.93) 3.27 ND(<2.54) 3.88 4.69

Barium EPA 6010B (mg/kg) NL 3000 NL 220000 96.7 71.2 62.8 63.2 56.1 81.0 74.0 189 68.5 63.5 45.7 67.2 56.1 65.2 57.4 63.3 63.6

Beryllium EPA 6010B (mg/kg) 180 27 6900 230 0.611 0.519 1.16 0.712 1.01 1.42 1.21 0.850 1.08 1.04 0.817 1.22 0.956 1.17 1.10 1.19 1.05

Cadmium EPA 6010B (mg/kg) 110 51 4000 1100 ND(<0.382) ND(<0.384) ND(<0.392) ND(<0.356) ND(<0.382) ND(<0.351) 0.567 0.927 ND(<0.392) ND(<0.393) ND(<0.389) ND(<0.370) ND(<0.390) ND(<0.396) ND(<0.339) ND(<0.373) ND(<0.381)

Chromium (total) EPA 6010B (mg/kg) NL NL NL NL 84.9 40.0 25.1 258 23.1 24.2 25.8 19.2 26.4 22.1 16.6 17.1 21.0 17.4 20.3 22.6 23.4

Cobalt EPA 6010B (mg/kg) 49 28 1900 350 8.69 5.96 8.13 18.3 6.84 9.19 6.97 6.49 7.35 6.89 5.76 7.71 6.88 7.83 7.24 7.79 7.51

Copper EPA 6010B (mg/kg) NL 14000 NL 47000 29.5 23.4 20.5 198 16.5 24.0 18.0 46.3 18.9 17.5 14.3 20.4 16.3 20.4 17.6 19.8 20.1

Lead EPA 6010B (mg/kg) 2700 160 380 320 55.5 27.1 8.74 18.8 7.37 11.5 9.22 251 13.8 7.99 6.79 8.91 7.27 8.84 8.26 8.71 24.4

Mercury EPA 7471A (mg/kg) NL 4.4 NL 190 0.235 0.938 0.331 0.274 0.558 0.372 0.132 0.229 0.223 0.179 0.344 0.283 0.517 0.217 0.269 0.237 0.665

Molybdenum EPA 6010B (mg/kg) NL 1800 NL 5800 ND(<0.382) ND(<3.84) ND(<3.92) 9.83 ND(<3.82) ND(<3.51) ND(<3.78) ND(<3.86) ND(<3.92) ND(<3.93) ND(<3.89) ND(<3.70) ND(<3.90) ND(<3.96) ND(<3.39) ND(<3.73) ND(<3.81)

Nickel EPA 6010B (mg/kg) 1700 86 64000 11000 42.5 22.7 13.6 475 12.7 13.5 13.3 11.3 13.8 12.4 8.72 10.0 11.4 10.4 11.7 12.5 12.5

Selenium EPA 6010B (mg/kg) NL 1700 NL 5800 ND(<2.86) ND(<2.88) ND(<2.94) ND(<2.67) ND(<2.86) ND(<2.64) ND(<2.83) ND(<2.90) ND(<2.94) ND(<2.95) ND(<2.92) ND(<2.77) ND(<2.93) ND(<2.97) ND(<2.54) ND(<2.80) ND(<2.86)

Silver EPA 6010B (mg/kg) NL 1800 NL 5800 ND(<1.91) ND(<1.92) ND(<1.96) 4.06 ND(<1.91) ND(<1.76) ND(<1.89) ND(<1.93) ND(<1.96) ND(<1.96) ND(<1.95) ND(<1.85) ND(<1.95) ND(<1.98) ND(<1.70) ND(<1.86) ND(<1.91)

Thallium 6010B/ 6020 (mg/kg) NL 3.50 NL 120 ND(<9.55) ND(<9.61) ND(<9.79) ND(<8.90) ND(<9.55) ND(<8.79) ND(<9.44) ND(<9.66) ND(<9.80) ND(<9.82) ND(<9.73) ND(<9.24) ND(<9.75) ND(<9.81) ND(<8.48) ND(<9.32) ND(<9.53)

Vanadium EPA 6010B (mg/kg) NL 470 NL 5800 35.7 29.1 35.4 33.2 29.0 37.0 32.8 28.8 34.1 31.5 26.4 37.9 29.5 37.6 31.3 35.3 35.2

Zinc EPA 6010B (mg/kg) NL 110000 NL 350000 106 1220 54.3 868 51.4 253 119 327 54.8 316 41.5 52.6 48.0 51.0 53.5 55.0 67.4

ESL (CW) = California EPA Environmental Screening Level for Soil, Construction Worker: Any Land Use/Any Depth Soil Exposure Case (San Francisco RWQCB, 2019).

ESL (CI) = California EPA Environmental Screening Level for Soil, Commercial/Industrial: Shallow Soil Exposure Case (San Francisco RWQCB, 2019).

NL = Chemical currently not listed for ESL by Cal EPA.

ND = not detected

NT = not tested

RL = Laboratory reporting limit mg/kg = milligrams of constituent per kilogram of soil ug/kg = micrograms of constituent per kilogram of soil

ESLs (CW) ESLs (CI)

Location:

Depth (feet):

PLATES

PLATE I Site Location Map PLATE II Site Exploration Map

PLATE III Soil Vapor Sampling Findings

SITE LOCATION MAP

Plate I

Source: USGS, 19 , Photorevised 19 ).Mt. Wilson 7.5 Minute Quadrangle ( 66 88

2211 EAST WALNUT STREET

, CALIFORNIAPASADENA

JULY 2025 306890-002

Approximate Site Location

Earth Systems

N

~ 2,000 ft.~ 1,000 ft.0 ft.

SET PK IN YARD

FD 2"IP LS2996

SET MON

SET MON

PT3003 CHK(NO EL)

SET 2X2 W/MAG IN SLOPE

SET ZMAC+CSI/W

LS

BW

BW

SD SDMH LID

SDMH RIM

BW

DWY BEG

DWY AP

DWY AP

DWY END

BXFL

LIP

LIP

BX

FL

CD 4"

EOC BEG

EOC AP

EOC AP

EOC CLO

TG COR

TG COR

TG COR

TG COR

EOC BEG

EOC END

EOC END

EOC BEG

NG

NG

NG

NG

PT10003 CHK

PT10002 CHK

LS

LS

LS

LS POL END

FW BEG

NG

NG

NG

NG

BW

FW

TC

FL

LIP

AC

NG

FW

BW

NG

NG

BW

FW

NG

AC

TRE 36"

GM COR

GM COR

GM COR

GM COR

WM WM 20X32

WM PR2.0

WM PR2.0

NG

BW

FW

NG

CC PAD COR

CC PAD COR

CC PAD COR

CC PAD COR

LP

SL

AC

NG

FW

BW

NG

FD LTT RCE5909

NG

DWY BEG

DWY AP

BXFL

LIP

LIP

FLBX

AC

DWY AP

DWY END

FW

BW

BW

FW

NG

EOC BEG

EOC END

NG

CC GB

CC GB

CC GB

EOC BEG

EOC END

TG COR

TG COR

TG COR

TG COR

SIGN

SIGN

NG

NG

NG

NG

NG

EOC BEG

EOC BEG

EOC AP

EOC AP

EOC AP

EOC AP

EOC AP CLO

EOC AP CLO

CC PAD CORCC PAD COR

CC PAD COR CC PAD COR

NGNG

NG

NG

U INTERCEPTOR MH LID

INTERCEPTOR MH RIM

U INTERCEPTOR MH LID NOT ATTACHED

U INTERCEPTOR MH LID NOT ATTACHED

CC PAD COR

CC PAD COR

CC PAD COR

CC PAD CORTG COR

TG COR

TG COR

TG COR

FL 6"

FL 4"

FL 4"

FL 4"

BOT BOX

CC PAD COR

CC PAD COR

CC PAD COR

CC PAD COR

LP

SL

LP

SL

CC PAD COR

CC PAD COR

CC PAD COR

CC PAD COR

SLPB PR1.20

SLPB PR1.20

LIP

FLTCCD 4"CD 4"

LIP

FLBX

CO

SCO

FW

BW NG

NG

DWY BEG

DWY AP

DWY AP

DWY END

AC

FW

BW

BW END

FW END

NG

BX

FL

LIP

TC END

TG COR

TG COR

TG COR

TG COR

CBW BEG PR0.50

CBW @COL PR0.50NG_CBW COL COR

NG_CBW @ COLNG_CBW @ COL PR0.70

NG_CBW @ COL PR0.70

NG_CBW COL COR

CC_CBW COL COR

CC_CBW COL COR

WIF GATE BEG

WIF GATE END

CC_CBW COL COR

CC_CBW COL COR

CC_CBW COL COR

CC_CBW COL COR

WIF DOOR BEG

WIF DOOR END

CC_CBW COL COR

CC_CBW COL COR

CC_CBW @COL PR0.70

CC_CBW @COL PR0.70

CC_CBW COL COR

CC_CBW COL COR

NG_CBW COL COR

NG_CBW @ COL PR0.70

NG_CBW @ COL PR0.70

NG_CBW COL COR

NG_CBW COL COR

NG_CBW @ COL PR0.70

NG_CBW @ COL PR0.70

NG_CBW COL COR

NG_CBW COL COR

NG_CBW @ COL PR0.70

NG_CBW @ COL PR0.70

NG_CBW COL COR

NG_CBW COL COR

NG_CBW @ COL PR0.70

NG_CBW @ COL PR0.70

NG_CBW COL COR

NG_CBW COL COR

NG_CBW @ COL COR PR0.70

NG_CBW @ COL COR PR0.70

NG_CBW COL COR

CC_CBW COL COR

CC_CBW COL COR

WIF GATE BEG

WIF GATE END

CC_CBW COL COR

CC_CBW COL COR

NG_CBW COL COR

NG_CBW @ COL PR0.70

NG_CBW AP

CC_CBW PL0.50

CC_CBW PL0.50

CC_CBW PL0.50

CC_CBW PL0.50

CC_CBW PL0.50

CC_CBW PL0.50

CC_CBW PL0.50

CC_CBW PL0.50

CC_CBW AP PL0.50

CC_CBW AP PL0.50

CC_CBW AP PL0.50

CC_CBW POL PL0.50

CC_CBW END @ BLDG PL0.50

DOOR BEG PL3.0

DOOR END PL3.0

ROLL UP DOOR BEG PL2.90

ROLL UP DOOR END PL2.90

TG COR

TG CORTG COR

TG COR

OH POST

OH POST

OH POST

OH POST

OH BEG

OH POL

OH POL

OH END

OH BEG OH POL OH AP

OH END

CC

CC

CC

TW BEG

TW APTW AP

TW

TW

TW

TW

TW

TW

TW

TW

TW

TW

TW

TW

TW AP

TOP COL

TOP COL

TOP COL

TOP COL

TOP COL

TOP COL

TOP COL

TOP COL

TOP COL

TOP COL

TOP COL

EP BEG

EP

EP

AC

AC

AC

AC

PT10003 CHK

PT10002 CHK

EOC AP

EOC BC

EOC POC

EOC POC EOC EC

EOC

EOC AP

EOC

EOC

EOC

EOC

EOC END

CO

SCO

NG

NG

NG

NG NG

NG

NG

NG

NG

NG

NG

NG

TG COR

TG CORTG COR

TG COR

TG COR

TG COR

TG COR

TG COR

CC

CC

CC GB

EOC

NG

NG

EOC BEG

CC_CBW BEG @ COL PR0.50

NG_CBW PR0.50

NG_CBW PR0.50

NG_CBW PR0.50

NG_CBW PR0.50

NG_CBW PR0.50

NG_CBW PR0.50

NG_CBW END@BLDG PR0.50

TW

TW

TW

TW

TW

TW

TW

TW

TW

TW

TW

TW

CC_CBW COL COR

CC_CBW COL COR

C_BCOR_CBW BEG

PP

PP

C_BCOR_CBW POL

ROLL UP DOOR BEG

ROLL UP DOOR END

OH BEG

OH END

WIF DOOR BEG

WIF DOOR END

WIF GATE BEG H=39"

WIF GATE END H=39"CC

CC_BCOR

STP BEG

STP END

FD 4"

TOP FDC@BLDG

TOP HOSE BIB@BLDG

TOP 3" PIPE@BLDG

TOP 2" PIPE@BLDG

CC_BLDG

CC_BLDG

CC_BLDG

CC_BLDG

CC_WIF DOOR BEG@BLDG

CC_WIF DOOR END@BLDG

CC_BLDG

CC_BLDG

CC_BCOR

FD 4"

EOC BEG

EOC END@CBWNG@CBW

NG@CBW

CC_CBW BEG PR0.65

CC_CBW BC PR0.65

CC_CBW POC PR0.65

CC_CBW POC PR0.65

CC_CBW EC PR0.65

CC_CBW PR0.65

CC_CBW AP

CC_CBW POL PR0.65

CC_CBW POL PR0.65

NG_CBW AP

NG_CBW EC

NG_CBW POC

NG_CBW POC

NG_CBW BC

TW

TW BC

TW POCTW POC STEP

TW POC

TW POC

TW POC STEP

TW EC

TW AP

TW

TW

CC_CBW PR0.65

CC_CBW PL0.65

CC_CBW PL0.65

CC_CBW PR0.65

TW

TW

CC_CBW PL0.65

CC_CBW PR0.65

CC_CBW PR0.65

CC_CBW PL0.65

TW

TW

CC_CBW PL0.65

CC_CBW PR0.65

WIF BEG H=36"

WIF STEP DN H=36"

WIF STEP DN H=36"

WIF END H=36"

CC_CBW PR0.65

CC_CBW PL0.65

CC_CBW PL0.65

CC_CBW PR0.65

CC_CBW PR0.65

CC_CBW PL0.65

CC_CBW END PL0.65

CC_CBW AP

CC_CBW END PR0.65

TW

TW

FL END

LIP END

LIP BEG

FL BEG

CC

CC

CC

CC

CC

CC

CC

CC

CC

CC

CC

CC GB

CC GB

CC GB

CC GB

CC GB

CC GB

CC

CC

CC

CC

FD 1"IP

LTT RCE1216

CONCRETE BLOCK

WALL

S

.7

"E

.0

S

.7

"E

.0

S80° 51' 44.30"W 0.172

Earth Systems

BASE MAP: Topographic Survey (Ruel Del Castillo, 2/3/2025)

LEGEND

T 12H Plate II

2211 WALNUT STREET

, CALIFORNIAPASADENA

JULY 2025 30 -0026890

SITE EXPLORATION MAP

APPROXIMATE SCALE

1 inch = 30 feet

(1:360)

020 20 40 80

B12

APPROXIMATE TEST HOLE LOCATION

APPROXIMATE BORING LOCATION

(Earth Systems, 2024)

T 1H

T 2H

T 3H

T 4H

TH5

T 6H

T 7H

T 8H

TH9

T 10H

T 11H

T 12H

B12B11

B10

AUTO PAINT

BOOTH

PAINT

BOOTH

EAST WALNUT STREET

SET PK IN YARD

FD 2"IP LS2996

SET MON

SET MON

PT3003 CHK(NO EL)

SET 2X2 W/MAG IN SLOPE

SET ZMAC+CSI/W

LS

BW

BW

SD SDMH LID

SDMH RIM

BW

DWY BEG

DWY AP

DWY AP

DWY END

BXFL

LIP

LIP

BX

FL

CD 4"

EOC BEG

EOC AP

EOC AP

EOC CLO

TG COR

TG COR

TG COR

TG COR

EOC BEG

EOC END

EOC END

EOC BEG

NG

NG

NG

NG

PT10003 CHK

PT10002 CHK

LS

LS

LS

LS POL END

FW BEG

NG

NG

NG

NG

BW

FW

TC

FL

LIP

AC

NG

FW

BW

NG

NG

BW

FW

NG

AC

TRE 36"

GM COR

GM COR

GM COR

GM COR

WM WM 20X32

WM PR2.0

WM PR2.0

NG

BW

FW

NG

CC PAD COR

CC PAD COR

CC PAD COR

CC PAD COR

LP

SL

AC

NG

FW

BW

NG

FD LTT RCE5909

NG

DWY BEG

DWY AP

BXFL

LIP

LIP

FLBX

AC

DWY AP

DWY END

FW

BW

BW

FW

NG

EOC BEG

EOC END

NG

CC GB

CC GB

CC GB

EOC BEG

EOC END

TG COR

TG COR

TG COR

TG COR

SIGN

SIGN

NG

NG

NG

NG

NG

EOC BEG

EOC BEG

EOC AP

EOC AP

EOC AP

EOC AP

EOC AP CLO

EOC AP CLO

CC PAD CORCC PAD COR

CC PAD COR CC PAD COR

NGNG

NG

NG

U INTERCEPTOR MH LID

INTERCEPTOR MH RIM

U INTERCEPTOR MH LID NOT ATTACHED

U INTERCEPTOR MH LID NOT ATTACHED

CC PAD COR

CC PAD COR

CC PAD COR

CC PAD CORTG COR

TG COR

TG COR

TG COR

FL 6"

FL 4"

FL 4"

FL 4"

BOT BOX

CC PAD COR

CC PAD COR

CC PAD COR

CC PAD COR

LP

SL

LP

SL

CC PAD COR

CC PAD COR

CC PAD COR

CC PAD COR

SLPB PR1.20

SLPB PR1.20

LIP

FLTCCD 4"CD 4"

LIP

FLBX

CO

SCO

FW

BW NG

NG

DWY BEG

DWY AP

DWY AP

DWY END

AC

FW

BW

BW END

FW END

NG

BX

FL

LIP

TC END

TG COR

TG COR

TG COR

TG COR

CBW BEG PR0.50

CBW @COL PR0.50NG_CBW COL COR

NG_CBW @ COLNG_CBW @ COL PR0.70

NG_CBW @ COL PR0.70

NG_CBW COL COR

CC_CBW COL COR

CC_CBW COL COR

WIF GATE BEG

WIF GATE END

CC_CBW COL COR

CC_CBW COL COR

CC_CBW COL COR

CC_CBW COL COR

WIF DOOR BEG

WIF DOOR END

CC_CBW COL COR

CC_CBW COL COR

CC_CBW @COL PR0.70

CC_CBW @COL PR0.70

CC_CBW COL COR

CC_CBW COL COR

NG_CBW COL COR

NG_CBW @ COL PR0.70

NG_CBW @ COL PR0.70

NG_CBW COL COR

NG_CBW COL COR

NG_CBW @ COL PR0.70

NG_CBW @ COL PR0.70

NG_CBW COL COR

NG_CBW COL COR

NG_CBW @ COL PR0.70

NG_CBW @ COL PR0.70

NG_CBW COL COR

NG_CBW COL COR

NG_CBW @ COL PR0.70

NG_CBW @ COL PR0.70

NG_CBW COL COR

NG_CBW COL COR

NG_CBW @ COL COR PR0.70

NG_CBW @ COL COR PR0.70

NG_CBW COL COR

CC_CBW COL COR

CC_CBW COL COR

WIF GATE BEG

WIF GATE END

CC_CBW COL COR

CC_CBW COL COR

NG_CBW COL COR

NG_CBW @ COL PR0.70

NG_CBW AP

CC_CBW PL0.50

CC_CBW PL0.50

CC_CBW PL0.50

CC_CBW PL0.50

CC_CBW PL0.50

CC_CBW PL0.50

CC_CBW PL0.50

CC_CBW PL0.50

CC_CBW AP PL0.50

CC_CBW AP PL0.50

CC_CBW AP PL0.50

CC_CBW POL PL0.50

CC_CBW END @ BLDG PL0.50

DOOR BEG PL3.0

DOOR END PL3.0

ROLL UP DOOR BEG PL2.90

ROLL UP DOOR END PL2.90

TG COR

TG CORTG COR

TG COR

OH POST

OH POST

OH POST

OH POST

OH BEG

OH POL

OH POL

OH END

OH BEG OH POL OH AP

OH END

CC

CC

CC

TW BEG

TW APTW AP

TW

TW

TW

TW

TW

TW

TW

TW

TW

TW

TW

TW

TW AP

TOP COL

TOP COL

TOP COL

TOP COL

TOP COL

TOP COL

TOP COL

TOP COL

TOP COL

TOP COL

TOP COL

EP BEG

EP

EP

AC

AC

AC

AC

PT10003 CHK

PT10002 CHK

EOC AP

EOC BC

EOC POC

EOC POC EOC EC

EOC

EOC AP

EOC

EOC

EOC

EOC

EOC END

CO

SCO

NG

NG

NG

NG NG

NG

NG

NG

NG

NG

NG

NG

TG COR

TG CORTG COR

TG COR

TG COR

TG COR

TG COR

TG COR

CC

CC

CC GB

EOC

NG

NG

EOC BEG

CC_CBW BEG @ COL PR0.50

NG_CBW PR0.50

NG_CBW PR0.50

NG_CBW PR0.50

NG_CBW PR0.50

NG_CBW PR0.50

NG_CBW PR0.50

NG_CBW END@BLDG PR0.50

TW

TW

TW

TW

TW

TW

TW

TW

TW

TW

TW

TW

CC_CBW COL COR

CC_CBW COL COR

C_BCOR_CBW BEG

PP

PP

C_BCOR_CBW POL

ROLL UP DOOR BEG

ROLL UP DOOR END

OH BEG

OH END

WIF DOOR BEG

WIF DOOR END

WIF GATE BEG H=39"

WIF GATE END H=39"CC

CC_BCOR

STP BEG

STP END

FD 4"

TOP FDC@BLDG

TOP HOSE BIB@BLDG

TOP 3" PIPE@BLDG

TOP 2" PIPE@BLDG

CC_BLDG

CC_BLDG

CC_BLDG

CC_BLDG

CC_WIF DOOR BEG@BLDG

CC_WIF DOOR END@BLDG

CC_BLDG

CC_BLDG

CC_BCOR

FD 4"

EOC BEG

EOC END@CBWNG@CBW

NG@CBW

CC_CBW BEG PR0.65

CC_CBW BC PR0.65

CC_CBW POC PR0.65

CC_CBW POC PR0.65

CC_CBW EC PR0.65

CC_CBW PR0.65

CC_CBW AP

CC_CBW POL PR0.65

CC_CBW POL PR0.65

NG_CBW AP

NG_CBW EC

NG_CBW POC

NG_CBW POC

NG_CBW BC

TW

TW BC

TW POCTW POC STEP

TW POC

TW POC

TW POC STEP

TW EC

TW AP

TW

TW

CC_CBW PR0.65

CC_CBW PL0.65

CC_CBW PL0.65

CC_CBW PR0.65

TW

TW

CC_CBW PL0.65

CC_CBW PR0.65

CC_CBW PR0.65

CC_CBW PL0.65

TW

TW

CC_CBW PL0.65

CC_CBW PR0.65

WIF BEG H=36"

WIF STEP DN H=36"

WIF STEP DN H=36"

WIF END H=36"

CC_CBW PR0.65

CC_CBW PL0.65

CC_CBW PL0.65

CC_CBW PR0.65

CC_CBW PR0.65

CC_CBW PL0.65

CC_CBW END PL0.65

CC_CBW AP

CC_CBW END PR0.65

TW

TW

FL END

LIP END

LIP BEG

FL BEG

CC

CC

CC

CC

CC

CC

CC

CC

CC

CC

CC

CC GB

CC GB

CC GB

CC GB

CC GB

CC GB

CC

CC

CC

CC

FD 1"IP

LTT RCE1216

CONCRETE BLOCK

WALL

S

.7

"E

.0

S

.7

"E

.0

S80° 51' 44.30"W 0.172

Earth Systems

SOIL VAPOR SURVEY FINDINGS

Plate III

2211 WALNUT STREET

, CALIFORNIAPASADENA

JULY 2025 30 -0026890BASE MAP: Topographic Survey (Ruel Del Castillo, 2/3/2025)

LEGEND

SV-12

APPROXIMATE SCALE

1 inch = 30 feet

(1:360)

020 20 40 80

APPROXIMATE TEST HOLE LOCATION

APPROXIMATE CONTOURS OF PCE

SOIL VAPOR (ug/m3) AT- 1’ BGS

SV-1

SV-2

SV-3

SV-4

SV-5

SV-6

SV-7

SV-8

SV-9

SV-10

SV-11

SV-12

SV-4-1

PCE TCE

SV-4-5 470 ND

531 35

SV-3-1

PCE TCE

326 ND

SV-6-1

PCE TCE

74 ND

SV-12-1

PCE TCE

SV-12-5 683 ND

283 ND

SV-5-1

PCE TCE

152 ND

SV-7-1

PCE TCE

55 ND

SV-8-1

PCE TCE

32 ND

SV-9-1

PCE TCE

31 ND

Ethylbenzene TPH

212 8,847

SV-10-1

PCE TCE

13 ND

SV-1-8

PCE TCE

27 ND

SV-2-1

PCE TCE

SV-2-8 ND ND

ND ND

SV-11-1

PCE TCE

ND ND

AUTO PAINT

BOOTH

PAINT

BOOTH

EAST WALNUT STREET

APPENDIX A

Unified Soil Classification System Soil Consistency Terms

Boring Log Symbols Logs of Geotechnical Test Borings

UNIFIED SOIL CLASSIFICATION SYSTEM

MAJOR DIVISIONS TYPICAL DESCRIPTIONSLETTER

SYMBOL

GRAPH

SYMBOL

COARSE

GRAINED

SOILS

GRAVEL AND

GRAVELLY

SOILS

SAND AND

SANDY SOILS

CLEAN

GRAVELS

(LITTLE OR NO

FINES)

GRAVELS WITH

FINES

(APPRECIABLE

AMOUNT OF FINES)

CLEAN SAND

(LITTLE OR NO

FINES)

SANDS WITH

FINES

(APPRECIABLE

AMOUNTOF FINES)

FINE

GRAINED

SOILS

SILTS

AND

CLAYS

SILTS

AND

CLAYS

LIQUID LIMIT LESS

THAN 50

LIQUID LIMIT

GREATER THAN 50

MORE THAN 50%

OF MATERIAL IS

LARGER THAN

NO. 200 SIEVE

SIZE

MORE THAN 50%

OF MATERIAL IS

SMALLER THAN

NO. 200 SIEVE

SIZE

HIGHLY ORGANIC SOILS

MORE THAN 50%

OF COARSE

FRACTION

RETAINED ON

NO. 4 SIEVE

MORE THAN 50%

OF COARSE

FRACTION

PASSING NO. 4

SIEVE

GW

GP

GM

GC

SW

SP

SM

SC

ML

CL

OL

MH

CH

OH

PT

WELL-GRADED GRAVELS, GRAVEL-

SAND MIXTURES, LITTLE OR NO FINES

POORLY-GRADED GRAVELS, GRAVEL-

SAND MIXTURES, LITTLE OR NO FINES

SILTY GRAVELS, GRAVEL-SAND-SILT

MIXTURES

CLAYEY GRAVELS, GRAVEL-SAND-CLAY

MIXTURES

WELL-GRADED SANDS, GRAVELLY

SANDS, LITTLE OR NO FINES

POORLY-GRADED SANDS, GRAVELLY

SANDS, LITTLE OR NO FINES

SILTY SANDS, SAND-SILT MIXTURES

CLAYEY SANDS, SAND-CLAY MIXTURES

INORGANIC SILTS AND VERY FINE

SANDS, ROCK FLOUR, SILTY OR CLAYEY

FINE SANDS OR CLAYEY SILTS WITH

SLIGHT PLASTICITY

INORGANIC CLAYS OF LOW TO MEDIUM

PLASTICITY, GRAVELLY CLAYS, SANDY

CLAYS, SILTY CLAYS, LEAN CLAYS

ORGANIC SILTS AND ORGANIC SILTY

CLAYS OF LOW PLASTICITY

INORGANIC SILTS, MICACEOUS OR

DIATOMACEOUS FINE SAND OR SILTY

SOILS

INORGANIC CLAYS OF HIGH PLASTICITY,

FAT CLAYS

ORGANIC CLAYS OF MEDIUM TO HIGH

PLASTICITY, ORGAINC SILTS

PEAT, HUMUS, SWAMP SOILS WITH HIGH

ORGANIC CONTENT

NOTE: DUAL SYMBOLS ARE USED TO INDICATE BORDERLINE SOIL CLASSIFICATIONS

Earth Systems

2211 EAST WALNUT STREET

JULY 2025 306890-002

SOIL CONSISTENCY TERMS

Earth Systems

TERMS DESCRIBING CONSISTENCY OR CONDITION

COARSE GRAINED SOILS

(Major Portion Retained on Number 200 Sieve)

Includes clean gravels and sands described as fine, medium or coarse, depending on distribution of grain sizes, and silty or clayey gravels and sands, condition is rated according to laboratory tests or estimated from resistance to sampler penetration.

Penetration Resistance* Standard Pentrometer

(SPT)

Blows/Ft

0-4 4-10

11-30 31-50 >50

Penetration Resistance* California Split Spoon

(CSS)

Blows/Ft

0-5 5-15

16-40 41-70 >70

Very Loose Loose

Medium Dense Dense

Very Dense

Fine Grained Soils (Major Portion Passing the Number 200 Sieve)

Includes inorganic and organic silts and clays, gravelly, sandy or silty clays, and clayey silts. Consistency is rated according to laboratory tests or estimated from resistance to sampler penetration.

Penetration Resistance* California Split Spoon

(CSS)

Blows/Ft

0-2 2-5

6-10 11-18 19-36 >36

Penetration Resistance* Standard Pentrometer

(SPT)

Blows/Ft

0-2 2-4 5-8

9-15 16-30 >30

Very Soft Soft

Medium Stiff Stiff

Very Stiff Hard

* Penetration resistance based on a 140 pound hammer falling approximately 30 inches.

2211 EAST WALNUT STREET

SYMBOLS COMMONLY USED ON BORING LOGS

Modified California Split Barrel Sampler

Modified California Split Barrel Sampler - No Recovery

Standard Penetration Test (SPT) Sampler

Standard Penetration Test (SPT) Sampler - No Recovery

Perched Water Level

Water Level First Encountered

Water Level After Drilling

Pocket Penetrometer (tsf)

Vane Shear (ksf)

1. The location of borings were approximately determined by pacing and/or siting from visible features. Elevations of borings are approximately determined by interpolating between plan contours. The location and elevation of the borings should be considered accurate only to the degree implied by the method used.

2. The stratification lines represent the approximate boundary between soil types and the transition may be gradual.

3. Water level readings have been made in the drill holes at times and under conditions stated on the boring logs. This data has been reviewed and interpretations made in the text of this report. However, it must be noted that fluctuations in the level of the groundwater may occur due to variations in rainfall, tides, temperature, and other factors at the time measurements were made.

BORING LOG SYMBOLS

Earth Systems

2211 EAST WALNUT STREET

Earth Systems 2122 East Walnut Street, Suite 200, Pasadena 91107

Phone: (626) 356-0955

PROJECT NAME: TOMF Pasadena BORING NO: B10

PROJECT NUMBER: DRILL RIG: GT-16 75

DRILLING DATE: DRILLING METHOD: 8-inch hollow-stem auger

BORING LOCATION: LOGGED BY: LP

B u lk

S P

T

M o d . C al if

6" concrete over 2.5" base.

Artificial Fill (af): Sandy SILT, reddish brown, dry, hard.

Alluvium (Qa): Silty fine SAND, orange-brown, slightly moist, medium dense, fine sand.

Silty fine SAND, orange-brown, slightly moist, medium dense.

Well-graded SAND, tan with orange oxidation, very dense.

Well-graded SAND with gravel, tan-orange-brown, dry, very dense, sub-rounded fine gravel.

ML

50(5")

20, 26, 35

13, 30, 23

50(6")

18, 26, 32 3.7

116.2 4.6

SW

SM

See Plate IV

U n it D ry W ei gh t

(p cf

10/28/2024

306890-001

M o is tu re C o n te n t

9, 10, 14

DESCRIPTION OF UNITS

P en et ra ti o n

R es is ta ce

(B lo w s/

-i n ch es

Sy m b o l

U

SC

S C la ss if ic at io n

9, 12, 18

13, 13, 17

Sample Type

8, 11, 14

V er ti ca l D ep th

3.1

117.4 4.4

Silty SAND trace gravel.

109.7 5.8

121.7 8.5

123.6 9.1

114.4 8.6

111.5 6.6

SM

PROJECT NAME: TOMF Pasadena BORING NO: B10

PROJECT NUMBER: DRILL RIG: GT-16 75

DRILLING DATE: DRILLING METHOD: 8-inch hollow-stem auger

BORING LOCATION: LOGGED BY: LP

B u lk

S P

T

M o d . C al if

Note: The stratification lines shown represent the approximate boundaries between soil and/or rock and may be gradational.

15, 16, 28

12, 25, 50(5")

41, 30, 30

40 U n it D ry W ei

U

SC

S C la ss if ic at io n

V er ti ca l D ep th

P en et ra ti is ta w s/

-i n ch es

Sy m b o l

Sample Type

SM

4.9

120.5 13.3

11.7 Dense.

Backfilled with soil cuttings.

No free groundwater encountered.

Total depth 50 feet.

Percolation testing from 20 to 50 feet.

DESCRIPTION OF UNITS

M o is tu re C o n te n t

306890-001

10/28/2024

See Plate IV

PROJECT NAME: TOMF Pasadena BORING NO: B11

PROJECT NUMBER: DRILL RIG: GT-16 75

DRILLING DATE: DRILLING METHOD: 8-inch hollow-stem auger

BORING LOCATION: LOGGED BY: LP

B u lk

S P

T

M o d . C al if

Hard

Medium dense

Dense

ML

See Plate IV

U n it D ry W ei

10/28/2024

306890-001

M o is tu re C o n te n t

11, 17, 19

29, 36, 39

DESCRIPTION OF UNITS

P en et ra ti is ta w s/

-i n ch es

Sy m b o l

U

SC

S C la ss if ic at io n

10, 13, 18

16, 17, 21

Sample Type

15, 24, 25

V er ti ca l D ep th

16, 18, 16

50(5.5")

18, 50(5")

6" concrete over 2.5" base.

Artificial Fill (af): Fine Sandy SILT, reddish brown, slightly moist, very stiff.

Alluvium (Qa): Silty SAND some gravel, tan, slightly moist, dense, up to coarse sand, fine trace gravel, roots.

Very dense

Total depth 30 feet.

No free groundwater encountered.

Backfilled with soil cuttings.

Note: The stratification lines shown represent the approximate boundaries between soil and/or rock and may be gradational.

117.3 4.8

121.7 4.8

SM

115.6

114.6 2.7

3.5

110.6 3.2

4.7

3.2

PROJECT NAME: TOMF Pasadena BORING NO: B12

PROJECT NUMBER: DRILL RIG: GT-16 75

DRILLING DATE: DRILLING METHOD: 8-inch hollow-stem auger

BORING LOCATION: LOGGED BY: LP

B u lk

S P

T

M o d . C al if

Stiff

119.8 12.1

122.9 12.5

118.6 10.6

SW

SM

125.1 9.3

119.8 3.3

2.3

109.1 11.8

1.4

Total depth 30 feet.

No free groundwater encountered.

Backfilled with soil cuttings.

Note: The stratification lines shown represent the approximate boundaries between soil and/or rock and may be gradational.

DESCRIPTION OF UNITS

P en et ra ti is ta w s/

-i n ch es

Sy m b o l

U

SC

S C la ss if ic at io n

3, 4, 6

5, 5, 6

Sample Type

7, 9, 13

V er ti ca l D ep th

Well-graded SAND with gravel, tan, slightly moist, very dense, sub-rounded gravel up to coarse-grained.

See Plate IV

U n it D ry W ei

10/28/2024

306890-001

M o is tu re C o n te n t

7, 11, 13

21, 30, 46

23, 36, 50(6")

24, 23, 30

6" concrete over 2.5" base.

Artificial Fill (af): Fine Sandy SILT, dark brown, dry, medium stiff.

Well-graded SAND with gravel, tan to brown, slightly moist, very dense, sub-rounded gravel up to coarse-grained.

ML

28, 36, 50(5")

Alluvium (Qa): Silty fine SAND trace gravel, orange-brown, slightly moist, medium dense, fine to coarse sand, fine trace gravel.

APPENDIX B

Soil Vapor Survey Report by Optimal Technology

1667 Cross Bridge Place, Thousand Oaks, CA 91362 • Toll Free (877) SOIL GAS (764-5427) • (818) 734-6230 • Fax (818) 734-62352369 Rutland Place, Thousand Oaks, CA 91362 • Toll Free (877) SOIL GAS (764-5427) • (818) 734-6230 • Fax (818) 734-6235

OPTIMAL TECHNOLOGY

Specializing in Environmental Field Services

Optimal Technology LH.indd 1 8/26/2008 2:46:55 PM

June 17, 2025

Mark Russell Earth Systems 2122 E. Walnut Street, Suite 200 Pasadena, CA 91107

Dear Mr. Russell:

This letter presents the results of the soil vapor investigation conducted by Optimal Technology (Optimal), for Earth Systems on June 16, 2025. The study was performed at 2211 E. Walnut St., Pasadena, California.

Optimal was contracted to perform a soil vapor survey at this site to screen for possible chlorinated solvents and aromatic hydrocarbons. The primary objective of this soil vapor investigation was to determine if soil vapor contamination is present in the subsurface soil.

Gas Sampling Method

Gas sampling was performed by hydraulically pushing soil gas probes to a depth of 1.0-8.0 feet below ground surface (bgs). An electric rotary hammer drill was used to drill a 1.0-inch diameter hole through the overlying surface to allow probe placement when required. The same electric hammer drill was used to push probes in areas of resistance during placement.

At each sampling location, an electric vacuum pump set to draw 0.2 liters per minute (L/min) of soil vapor was attached to the probe and purged prior to sample collection. Vapor samples were obtained in gas-tight syringes by drawing the sample through a luer-lock connection which connects the sampling probe and the vacuum pump. Samples were immediately injected into the gas chromatograph/purge and trap after collection. New tubing was used at each sampling point to prevent cross contamination.

All analyses were performed on a laboratory grade Agilent model 6890N gas chromatograph equipped with an Agilent model 5973N/5975 Mass Spectra Detector and Tekmar LSC 3100 Purge and Trap. A Restek column using helium as the carrier gas was used to perform all analysis. All results were collected on a personal computer utilizing Agilent's MS and chromatographic data collection and handling system.

Quality Assurance

5-Point Calibration The initial five-point calibration consisted of 20, 50, 100, 200 and 500 ul injections of the calibration standard. A calibration factor on each analyte was generated using a best fit line method using the Agilent data system. If the r2 factor generated from this line was not greater than 0.990, an additional five-point calibration would have been performed. Method reporting limits were calculated to be 1-1000 micrograms per cubic meter (ug/m3) for the individual compounds.

A daily calibration check was performed using a pre-mixed standard supplied by Scotty Analyzed Gases. The standard contained common halogenated solvents and aromatic hydrocarbons (see Table 1). The individual compound concentrations in the standards ranged between 0.025 nanograms per microliter (ng/ul) and 0.25 ng/ul.

TABLE 1

Benzene Bromobenzene Bromochloromethane Bromodichloromethane Bromoform Bromomethane n-Butylbenzene sec-Butylbenzene tert-Butylbenzene Carbon Tetrachloride Chlorobenzene Chloroethane Chloroform Chloromethane 2-Chlorotoluene 4-Chlorotoluene Dibromochloromethane 1,2-Dibromo-3-chloropropane 1,2-Dibromoethane Dibromomethane 1,2-Dichlorobenzene 1,3-Dichlorobenzene 1,4-Dichlorobenzene Dichlorodifluoromethane 1,2-Dichloroethane 1,1-Dichloroethane 1,1-Dichloroethene cis-1,2-Dichloroethene trans-1,2-Dichloroethene 1,2-Dichloropropane 2,2-Dichloropropane 1,3-Dichloropropane 1,1-Dichloropropene Ethylbenzene Hexachlorobutadiene Isobutane Isopropylbenzene p-Isopropyltoluene Methylene Chloride Naphthalene n-Propylbenzene Styrene 1,1,1,2-Tetrachloroethane 1,1,2,2-Tetrachloroethane Tetrachloroethene Toluene 1,2,3-Trichlorobenzene 1,2,4-Trichlorobenzene 1,1,1-Trichloroethane 1,1,2-Trichloroethane Trichloroethene Trichlorofluoromethane 1,2,3-Trichloropropane 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Vinyl Chloride m/p-Xylene o-Xylene Diisopropyl Ether Ethyl Tert Butyl Ether MTBE Tert-Amyl Methyl Ether Tertiary Butyl Alcohol

Sample Replicates A replicate analysis (duplicate) was run to evaluate the reproducibility of the sampling system and instrument. The difference between samples did not vary more than 20%.

Equipment Blanks Blanks were run at the beginning of each workday and after calibrations. The blanks were collected using an ambient air sample. These blanks checked the septum, syringe, GC column, GC detector and the ambient air. Contamination was not found in any of the blanks analyzed during this investigation. Blank results are given along with the sample results.

Purge Volume The standard purge volume of three volumes was purged in accordance with the July 2015 DTSC/RWQCB Advisory for Active Soil Gas Investigations.

Tracer Gas Leak Test A tracer gas was applied to the soil gas probes at each point of connection in which ambient air could enter the sampling system. These points include the top of the sampling probe where the tubing meets the probe connection and the surface bentonite seals. Isobutane was used as the tracer gas. No Isobutane was found in any of the samples collected.

Shut-in Test A shut-in test was conducted prior to purging or sampling each location to check for leaks in the above-ground sampling system. The system was evaluated to a minimum measured vacuum of 100 inches of water. The vacuum gauge was calibrated and sensitive enough to indicate a water pressure change of at least 0.5 inches.

Scope of Work

To achieve the objective of this investigation a total of 17 vapor samples were collected from 12 locations at the site. Sampling depths, vacuum readings, purge volume and sampling volumes are given on the analytical results page. All the collected vapor samples were analyzed on-site using Optimal’s mobile laboratory.

Subsurface Conditions

Subsurface soil conditions offered sampling flows at 0” water vacuum.

Results

During this vapor investigation, analytes were detected in multiple samples collected above the listed reporting limit. Please see the complete table of analytical results included with this report.

Disclaimer

All conclusions presented in this letter are based solely on the information collected by the soil vapor survey conducted by Optimal Technology. Soil vapor testing is only a subsurface screening tool and does not represent actual contaminant concentrations in either the soil and/or groundwater. We enjoyed working with you on this project and look forward to future projects.

If you have any questions, please contact me at (877) 764-5427.

Sincerely, Adam Guba Project Manager

1667 Cross…