REPORT_4_REFERENCE_ONLY.pdf

500 N Victory Boulevard ■ Burbank, CA 91502 ■ Telephone 818.841.8388 ■ Fax 818.841.1704

Project No. S2940-07-04 June 3, 2025

State of California Department of General Services Real Estate Services Division 707 Third Street West Sacramento, California 95605

Attention: Ms. Jose Enriquez, Project Director

Subject: SOIL VAPOR SCREENING SURVEY

METROPLITAN STATE HOSPITAL

11401 BLOOMFIELD AVENUE

NORWALK, CALIFORNIA

Mr. Enriquez:

In accordance with Task Order #1 of Agreement #31529-B, we have performed a soil vapor screening survey of the southeastern portion of the property location at 11401 Bloomfield Avenue, in Norwalk, California (the site).

We appreciate the opportunity to have performed this screening survey. Please contact us if you have any questions concerning this report or if we may be of further service.

Respectfully, GEOCON, INC.

Yasmeen De La Cruz Marci J. Richards, PG Staff Geologist Senior Geologist

11401 Bloomfield Avenue Soil Vapor Screening Survey

TABLE OF CONTENTS

SOIL VAPOR ASSESSMENT PAGE

1.0 Introduction

Location and Description Previous Site Assessments Offsite Assessments (Powerine Oil Co. Refinery)

1.1 Proposed Development

1.2 Purpose

2.0 FIELD ACTIVITIES

2.1 Utility Clearance

2.2 Geophysical Survey

2.3 Soil Vapor Survey, Sampling and Field Measurements

2.4 Soil Sampling

3.0 LABORATORY ANALYTICAL RESULTS

3.1 Soil Vapor Analytical Results

3.2 VOCs

3.2.1 Benzene

3.2.2 Chloroform

3.3 Fixed Gases

3.4 Particle Size Analytical Results

4.0 Evaluation of Soil Vapor Results

5.0 CONCLUSIONS

6.0 REFERENCES

FIGURES

1. Site Location Map

2. Soil Vapor Probe Location Map

TABLES

1. Summary Laboratory Analytical Results - Soil Vapor

2. Summary Laboratory Analytical Results – Fixed Gases

APPENDICES

A. Background Information B. Laboratory Reports C. JE Model Worksheets

Project No. S2940-07-04 - 1 - June 3, 2025

SOIL VAPOR SCREENING SURVEY REPORT

1.0 INTRODUCTION

Geocon, Inc. (Geocon) performed a soil vapor screening survey of a portion of the larger property located at 11401 Bloomfield Avenue, Norwalk, California; the survey was performed southwest of the 6th Street and Bloomfield Avenue intersection (site) (Figures 1 and 2). We performed the soil vapor screening survey at the request of Department of General Services (DGS, the client) and in accordance with Task Order #1 of Agreement #31529-B. The scope of the soil vapor screening survey is set forth in Geocon’s Proposal No. SA-25-0124-P-EV dated February 20, 2025, to evaluate if engineering controls may be required prior to the proposed construction activities at the site for a slab on grade building.

Location and Description

The site is approximately 1-acre within the southeastern portion of the larger Metropolitan State Hospital, an approximate 155-acre property, located west of Bloomfield Avenue and approximately 2,300 feet north of Imperial Highway in Norwalk, California (Figure 1). The site is further identified as Los Angeles County assessor’s parcel number (APN) 8025-003-902. The southeastern portion of the property is developed with a two-story building, which is currently vacant and the proposed location of a new building (Figure 2). To the north approximately 2,900 feet is the former Powerine Refinery (12345 Lakeland Road, Santa Fe Springs).

Project No. S2940-07-04 - 2 - June 3, 2025

Previous Site Assessments

Hillman Consulting - Phase I Environmental Site Assessment - An Approximately 7-acres portion of 11401 Bloomfield Avenue Norwalk, California 90650, dated May 2018 and updated July 2018.

A Phase I ESA report was prepared by Hillmann Consulting (Hillmann) that identified impacted groundwater and a vapor encroachment condition as recognized environmental conditions (RECs) for the site; the RECs were associated with the upgradient former Powerine Oil Co. Refinery. Hillmann observed two monitoring wells during their site reconnaissance, MW-714 “…on the central portion of the property” and W-15A, B, C on the southern portion of the property, which were identified as associated with the former Powerine Oil Co. Refinery. Based on Hillmann’s review of select 2017 and 2018 groundwater monitoring reports for the Powerine Oil Co. Refinery, concentrations of total petroleum hydrocarbons (TPH) as gasoline, TPH as diesel, benzene, methyl tert butyl ether (MTBE), and/or tert butyl alcohol (TBA) were detected in MW-714 and W-15A, B, C. Based on the analytical results, Hillman stated “…. there appears to be environmental impacts to the groundwater beneath the Property.” In addition, the elevated levels of volatile organic carbons (VOCs) detected were considered a vapor encroachment condition (VEC). Hillman recommended “…that prior to any future development of new structures, a subsurface investigation should be conducted to determine whether engineering controls will be required to mitigate for any vapor encroachment conditions.”

A draft Phase I ESA dated June 15, 2018, prepared by Terracon Consultants was included in the appendix of Hillman’s Phase I ESA. Groundwater contamination beneath the site in connection with the former Powerine Oil Co Refinery was identified as a REC and a VEC for the site.

Comment: Comparing Hillmann’s report figures to the Powerine Oil Co. Refinery groundwater report figures (Orion, 2024), the reference that MW-714 is “…on the central portion of the property” appears incorrect; MW-714 is located north of the site (Appendix A, Orion Figure 3).

Environment-Planning-Development Solutions, Inc. – Final Environmental Impact Report, DSH- Metropolitan Consolidation of Police operations, Norwalk, California, dated April 2019.

The Final Environmental Impact Report cites the Hillman and Terracon Phase I ESA reports and the identified RECs in Section 4.8 Hazards and Hazardous Materials and Section 5.7.3 Environmental Setting. For these RECs associated with the former Powerine Oil Co. Refinery, “ongoing remediation and monitoring activities are currently overseen by the RWQCB [Regional Water Quality Control Board].”

Project No. S2940-07-04 - 3 - June 3, 2025

Offsite Assessments (Powerine Oil Co. Refinery)

Geocon reviewed recent Powerine Oil Co. Refinery assessment documents in preparation for the soil vapor screening evaluation. Powerine Oil Co. Refinery occupied the property on the northwest corner of Lakeland Road and Bloomfield from the 1930s until 1995, and their operations resulted in various leaks and spills. Quarterly groundwater monitoring and sampling have been conducted at the facility and off-site since 1986. Dissolved phase plumes extend from the facility to the south across the Metropolitan State Hospital property and adjacent properties (Appendix A). The primary chemicals of concern are petroleum hydrocarbons and volatile organic compounds. Depth to groundwater ranges from approximately 89 to 120 feet bgs and flows to the southwest (Orion, 2024). Remediation is ongoing at the Powerine Oil Co. Refinery and offsite vapor intrusion evaluations have been performed south of the Powerine Oil Co. Refinery across Lakeland Road, inclusive of the northern portion of the Metropolitan State Hospital (Appendix A).

1.1 Proposed Development

As provided by DGS, the proposed development of the site consists of a new one-story building for the Hospital Police and the Office of Special investigation headquarters, parking lots, crosswalks, sidewalks, and landscaping (Appendix A). Basements or other below-grade improvements are not planned.

1.2 Purpose

The purpose of the soil vapor screening survey was to evaluate the presence of volatile organic compounds (VOCs), in soil vapor around the perimeter of the existing building, which is roughly within/adjacent to the proposed footprint of the new building (Appendix A). Sampling locations were selected to provide a representative soil vapor screening survey downgradient of the former Powerine Oil Co. Refinery.

2.0 FIELD ACTIVITIES

Four locations for temporary soil vapor probes were selected around the perimeter of the building (Figure 2). Locations were selected based on the southeast groundwater flow direction, footprint of existing and proposed building, and to be representative of the site.

2.1 Utility Clearance

For utility clearance, the proposed soil vapor probe locations were marked with white paint as required by law, and a ticket for Underground Service Alert (USA, Ticket No. A251110302-01A) was submitted on April 21, 2025. No conflicts were encountered with the proposed locations.

Project No. S2940-07-04 - 4 - June 3, 2025

2.2 Geophysical Survey

On April 24, 2025, Geocon performed a geophysical survey of the proposed soil vapor probe locations to evaluate the presence of utilities. The utility investigation was conducted using a combination of electromagnetic, magnetic, and ground-penetrating radar (GPR) instruments to maximize subsurface coverage and detection reliability. The equipment used for this study included the Geonics EM61 MK2 time-domain metal detector, Schonstedt GA-52 magnetic gradiometer, Fisher M-Scope TW-6 pipe and cable locator, Vivax vLoc3-Pro line tracer, and the GSSI Utility Scan GPR system with a 400 MHz antenna.

All readily accessible areas of the site were systematically surveyed, and identified subsurface features were marked on the ground surface using paint. No conflicts were encountered with the proposed locations.

2.3 Soil Vapor Survey, Sampling and Field Measurements

On April 25, 2025, H&P Mobile GeoChemistry advanced four soil vapor borings to 5 and 10 feet below ground surface (bgs) using a Strataprobe DPT Rig. Temporary dual-nested soil vapor probes to 5 and 10 feet bgs were constructed in each boring (SV1 and SV4) (Figure 2). Soil vapor probes were constructed with Airstone filters, 1/8" Nylaflow tubing, and a valve at the termination. The probe tips were set within a 12-inch sand pack, with a minimum of 6-inch dry bentonite above the sand.

The annular seal between probe depths and/or to the surface consisted of granular bentonite hydrated in lifts.

Following a minimum 2-hour equilibration, soil vapor samples were collected in 400 milliliter summa canisters in general accordance with DTSC guidelines and H&Ps NEFAP Certification for Active Soil Vapor Sampling. One replicate sample was collected from SV2-5. At each location, a shut-in test was performed for 60 seconds and 1,1 Difluoroethane (DFA) was used as a leak check. Probe vacuum and flow rate were monitored and recorded during purging and sampling. Each probe was purged using three purge volumes (tubing + 40% sand pack + 50% dry bentonite), where conditions permitted, prior to sampling. Following sampling, temporary probe locations were abandoned by removing the tubing and backfilling each location. Field log sheets are included in the laboratory analytical report (Appendix B).

In conjunction or following the sampling collection at each probe, a Landtec meter was utilized to measure fixed gases, methane, carbon dioxide, oxygen and nitrogen. Concentrations as percentages were recorded on a log sheet that is included in the laboratory analytical report (Appendix B).

Project No. S2940-07-04 - 5 - June 3, 2025

2.4 Soil Sampling

During the drilling of borings SV2 and SV4, continuous coring was performed to collect samples for particle size analysis. No odor or staining was observed in the continuous cores or in the soil samples collected. The particle size analysis is presented in Section 3.3.

3.0 LABORATORY ANALYTICAL RESULTS

This section summarizes the laboratory analytical results for the soil vapor samples and the particle size analysis of the soil samples.

3.1 Soil Vapor Analytical Results

H&P Mobile GeoChemistry analyzed the soil vapor samples for VOCs by United States Environmental Protection Agency (USEPA) Method TO-15. VOC results were compared to their respective San Francisco Bay Regional Water Quality Control Board’s environmental screening levels (ESLs) and/or the California State Water Resources Board’s Low-Threat Underground Storage Tank Case Closure Policy (LTCP), as applicable.

3.2 VOCs

One or more VOCs were detected in each of the samples and each were below their respective ESLs, except benzene in SV1-5 and chloroform in SV2-10. Laboratory analytical results are summarized on Table 1 and a copy of the laboratory report is in Appendix B. The following discusses detected concentrations above their respective ESLs.

3.2.1 Benzene

Benzene was detected at a concentration of 15 micrograms per meter cubed (µg/m3) in SV1-5, slightly above the benzene ESL of 14 µg/m3. However, the benzene concentration is below the LTCP benzene concentration of 280 µg/m3 for commercial use and therefore, not considered a constituent of concern for the site. Detected benzene concentrations in the other eight samples ranged from 1.5 µg/m3 to 12 µg/m3, below the ESLs and LTCP concentrations.

Project No. S2940-07-04 - 6 - June 3, 2025

3.2.2 Chloroform

Chloroform was detected at a concentration of 20 µg/m3 in SV2-10, slightly above the chloroform ESL of 18 µg/m3. Chloroform was also detected in seven of the other eight samples at concentrations ranging from 1.3 µg/m3 to 14 µg/m3, below the ESL concentration. The chloroform concentrations are attributed to chlorinated drinking water and are likely associated with the potable water utilized to irrigate the lawn at the site; therefore, chloroform is not considered a constituent of concern for the site.

3.3 Fixed Gases

Nitrogen, carbon dioxide, and oxygen percentages ranged from 79.8 to 81.6%, 0.6 to 4.6% and 14.2 to 19.5%, respectively in the samples collected. The oxygen percentages are sufficient to provide aerobic degradation. Methane was not detected and reported at 0%. Results for the fixed gases are summarized in Table 2. The field log is included in the laboratory report in Appendix B.

3.4 Particle Size Analytical Results

Based on the particle size analysis, the soils are classified as clayey silty sand and were relatively homogenous between the samples. Copies of the particle size analysis are presented in Appendix B.

4.0 EVALUATION OF SOIL VAPOR RESULTS

As previously mentioned, the benzene concentration in SV1-5 is below the LTCP concentration and chloroform concentrations are attributed to the chlorinated/potable water utilized for irrigation and are not considered a threat to the health of future site users (commercial).

As an extra level of confidence and at the request of DGS, a soil vapor screening risk evaluation was performed using the DTSC-modified Johnson and Ettinger Model (JE Model) with the maximum detected benzene and chloroform concentrations as the representative exposure concentrations.

The highest benzene concentration detected at the site is 15 µg/m3 (SV1-5), and the highest chloroform concentration is 20 µg/m3 (SV2-10). The JE Model parameter values were used except where site-specific data were input (e.g., commercial exposure, slab-on-grade, sample depths, sand). Sand was selected as the soil type because “clayey silty sand” is not an option within the JE Model used and is considered more conservative than the other options (loamy sand or sandy loam) with respect to vapor flow. Comparing the particle size analysis results with the USDA Soil Texture Triangle (included in Appendix B), “clayey silty sand” is of a similar composition as “loamy sand” and “sandy loam. The JE Model outputs for sand are summarized below and worksheets are included in Appendix C.

Project No. S2940-07-04 - 7 - June 3, 2025

Location Soil Gas

Concentration Applied (ug/m3)

Depth below grade

(meters)

SCS Soil Type

Residential Risk Incremental Cancer risk from Vapor

Intrusion

Hazard Quotient from

Vapor Intrusion

SV1-5 15 Benzene 1.52 Sand 3.03E-09 9.75E-05 SV2-10 20 Chloroform 3.05 Sand 9.85E-010 1.22E-06

Commercial Building

The incremental cancer risk and hazard quotient from vapor intrusion to an onsite slab-on-grade commercial building is less than the target risk goals of 1x10-6 for cancer risk and 1 for a hazard quotient (non-cancer risk). The JE Model for slab-on-grade commercial use calculates a target soil gas concentration of 330 µg/m3 for benzene and 1,010 µg/m3 for chloroform in sand.

The site-specific modeling using the JE Model demonstrates that benzene and chloroform concentrations in onsite soil vapor beneath the planned commercial building are less than the incremental cancer risk and hazard quotient indicating that there appears to be no threat to the health of future site workers or occupants.

Project No. S2940-07-04 - 8 - June 3, 2025

5.0 CONCLUSIONS

Based on the detected soil vapor concentrations below the ESLs, LTCP threshold, and/or less than the incremental cancer risk and hazard quotient, there appears to be no threat to the health of future site use as a commercial facility. No further action regarding a potential vapor intrusion concern or engineering controls appear warranted for the proposed construction activities at the site for a slab on grade building.

Project No. S2940-07-04 - 9 - June 3, 2025

6.0 REFERENCES

California State Water Resources Board, Low-Threat Underground Storage Tank Case Closure Policy, August 14, 2012.

Hillmann Consulting, Phase I Environmental Site Assessment an approximate 7 acres portion of 11401 Bloomfield Avenue, Norwalk, California, dated May 31, 2018, updated July 11, 2018.

Orion, Soil Vapor Intrusion Assessment Report, Former Powerine Oil Corporation Refinery – Offsite Impacted Area, 12345 Lakeland Road, Santa Fe Springs, California, dated January 26, 2024.

Orion, Second Semiannual 2024 Groundwater Monitoring and Remediation Status Report, Former Powerine Oil corporation Refinery – Offsite Impacted Area, 12345 Lakeland Road, Santa Fe Springs, California, dated January 26, 2024.

San Francisco Bay Regional Water Quality Control Board, Environmental Screening Levels, Rev.2, July 2019.

VICINITY MAP

N

ENVIRONMENTAL GEOTECHNICAL MATERIALS

FIG. 1JUNE 2024 PROJECT NO. W1482-88-05A

18601 AIRPORT WAY

SANTA ANA, CALIFORNIA

DRAFTED BY: YD

SITE LOCATION MAP

N

ENVIRONMENTAL GEOTECHNICAL MATERIALS

500 N. VICTORY BLVD.- BURBANK, CA 91502

PHONE (818) 841-8388 - FAX (818) 841-1704

FIG. 1JUNE 2025

SOIL VAPOR SCREENING SURVEY

METROPOLITAN STATE HOSPITAL

11401 BLOOMFIELD AVENUE

NORWALK, CALIFORNIA

REFERENCE: U.S.G.S. TOPOGRAPHIC MAP, 7.5 MINUTE SERIES, WHITTIER CA QUADRANGLES

PROJECT NO. S2940-07-04

SITE

CHECKED BY: MR

Approximate soil vapor boring location

LEGEND

SOIL VAPOR PROBE LOCATION MAP

METROPOLITAN STATE HOSPITAL

11401 BLOOMFIELD AVENUE

NORWALK, CALIFORNIA

JUNE 2025 PROJECT NO. S2940-07-04 FIGURE 2DRAFTED BY: YD CHECKED BY: MR

ENVIRONMENTAL GEOTECHNICAL MATERIALS

500 N. VICTORY BLVD - BURBANK, CA 91502

PHONE (818) 841-8388 - FAX (818) 841-1704

REFERENCE MAP: GOOGLE SATELLITE

SV1

L-1

0 120ft60

SV3

SV4

SV2

SV1

S2940-07-04

June 2025

SV1-5 SV1-10 SV2-5 SV2-5 REP SV2-10 SV3-5 SV3-10 SV4-5 SV4-10

4/25/2025 1,1-Difluoroethane (LCC) 11 <2.2 <2.2 <2.2 <2.2 <2.2 <2.2 <2.2 <2.2 -- NE

4/25/2025 Chloromethane <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 <0.8 1.4 <0.8 13,000 NE

4/25/2025 Trichlorofluoromethane (F11) <2.3 <2.3 <2.3 <2.3 <2.3 3.7 5.0 <2.3 <2.3 -- NE

4/25/2025 Methylene chloride (Dichloromethane) 6.9 <1.4 2.1 1.9 <1.4 <1.4 <1.4 3.0 <1.4 410 NE

4/25/2025 Carbon disulfide 14 5.7 2.2 2.0 3.7 3.4 5.3 7.4 2.5 -- NE

4/25/2025 2-Butanone (MEK) 45 29 7.1 8.0 9.4 12 11 45 4.7 730,000 NE

4/25/2025 Chloroform 5.1 4.8 13 14 20 1.6 3.2 1.3 <1.0 18 NE

4/25/2025 Benzene 15 2.7 4.9 4.6 4.6 4.1 5.7 12 1.5 14 85

4/25/2025 4-Methyl-2-pentanone (MIBK) 11 11 4.4 3.4 6.0 4.0 5.5 12 <3.3 440,000 NE

4/25/2025 Toluene 25 4.7 17 15 11 9.7 10 27 <3.1 44,000 NE

4/25/2025 Tetrachloroethene 4.5 4.8 <2.8 <2.8 <2.8 <2.8 <2.8 <2.8 38 67 NE

4/25/2025 Ethylbenzene 61 13 7.3 4.1 11 4.2 13 25 <1.8 160 1,100

4/25/2025 m,p-Xylene 150 46 25 15 45 15 47 92 <1.8 -- NE

4/25/2025 o-Xylene 64 18 12 6.9 21 6.0 18 45 <1.8 -- NE

4/25/2025 4-Ethyltoluene <2.0 <2.0 3.6 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 -- NE

4/25/2025 1,3,5-Trimethylbenzene <2.0 <2.0 4.5 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 -- NE

4/25/2025 1,2,4-Trimethylbenzene <2.0 3.5 15 2.4 2.3 <2.0 2.0 3.3 <2.0 -- NE

4/25/2025 1,2,4-Trimethylbenzene <2.0 3.5 15 2.4 2.3 <2.0 2.0 3.3 <2.0 -- NE

4/25/2025 Other VOCs

Notes: Concentrations reported in micrograms per cubic meter (µg/m3)

< = Not detected at or exceeding laboratory reporting limit indicated

-- = Screening level not promulgated

VOC = volatile organic compounds

NE = not established

ESLs = Environmental Screening Level, San Francisco Bay Regional Water Quality Control Board, 2019 (Rev 2)

Commercial Esls = Cancer Risk or Non-Cancer Risk for Commercial

LTCP = Low Threat Closure Policy

11401 BLOOMFIELD AVENUE

NORWALK, CALIFORNIA 90650

AnalyteDate Collected Commercial ESLs below respective laboratory reporting limit

Table 1

SUMMARY OF LABORATORY ANALYTICAL RESULTS-SOIL VAPOR

VOLATILE ORGANIC COMPOUNDS BY USEPA METHOD TO-15

METROPLITAN STATE HOSPITAL

LTCP

Sample ID

SV1-5 SV1-10 SV2-5 SV2-10 SV3-5 SV3-10 SV4-5 SV4-10

4/25/2025 CO2 (%) 0.6 3.9 3.6 4 3.6 4.6 0.7 4.6

4/25/2025 O2 (%) 18 14.8 15.5 14.8 14.2 14.3 19.5 15.2 4/25/2025 N2 (%) 81.4 81.6 80.5 81 81.6 80.8 79.8 80.1

4/25/2025 CH4 (%) 0 0 0 0 0 0 0 0

Note: CO2= Carbon Dioxide O2= Oxygen N2= Nitrogen CH4 = Methane

* = Fixed gas data generated in field via Landtec Meter

Table 2 Summary of Fixed Gas

Metropolitan State Hospital 11401 Bloomfield Avenue Norwalk, California, 90650

Sample ID Date Collected Fixed Gas*

APPENDIX A

PDC NORWALK

(FORMERLY KNOWN AS

PERFORMANCE TEAM)

FLORENCE AVE.

LAKELAND RD.

N O

R W

A L

K

B

L V

D

B L

O O

M F

I E

L D

A

V E

ULTRAMAR/

CAMINOL OIL

CYCLOPS ST.

V O

L U

N T

E E

R

A

V E

KELLY PIPE

(COASTER)

WALKER PROPERTY

STATE HOSPITAL

ALLARD ST.

G

E

T

T

Y

D

R

2ND ST.

CREWE ST.

7TH ST.

H

S

8TH ST.

DUNE ST.

SPRY ST.

RESIDENTIAL

RESIDENTIAL

COMMERCIAL

COMMERCIAL

COMMERCIAL

METROPOLITAN

FORMER POWERINE REFINERY

PROPERTY

BLOOMFIELD

MW-203

W-3A

MW-106A

MW-107A

MW-501A

MW-502

MW-601A

MW-607

MW-606

MW-503B

MW-603

MW-605

EW-1

MW-719

MW-715

MW-713

MW-709

MW-711

W-1

W-16A

W-16B

W-16C

MW-720

MW-721

MW-725

MW-727r

W-4

MW-712

MW-723

MW-728

W-15A

W-15B

W-15C

MW-717

MW-710

MW-722

MW-726

W-14A

W-14B

W-14C

MW-714

MW-604

MW-724

GMW-2B

GMW-2A

MW-731

MW-730

MW-729

(DRY)

(44.38)*

(34.55)

(27.07)

(30.70)

(25.95)

(21.40)

(22.35)

(18.06)

(41.27)

(15.81)

(16.84)

(16.86)

(18.80)

(16.73)

(15.43)

(13.99)

(13.66)

(19.62)

(15.77)

(14.20)

(21.97)

(29.56)

(25.71)

(DRY)

(41.58)*

(40.43)*

(20.41)

(23.18)*

(23.47)*

(15.49)

(15.56)*

(15.96)*

(DRY)

(DRY)

(DRY)

(DRY)

(DRY)

(DRY)

(DRY)

(DRY)

(DRY)

(NL)

(DRY)

(DRY)

(28.88)

(23.71)

(22.71)

MW-600A

W-9A

MW-705

MW-704R

MW-706

MW-701

MW-703

W-10R

EX-4

EX-3

EX-2

MW-707

(30.90)

MW-17A

MW-104A

MW-708

EX-1

FORMER LAKELAND PROPERTY

Legend

Long Beach, California 90806

(562) 988-2755

Orion Environmental Inc.

2955 Redondo Avenue

FIGURE

PROJECT

81POW-Q2-24.dwg

DATE

APPROXIMATE SCALE IN FEET

0 500 1,000

SITE PLAN WITH GROUNDWATER

ELEVATIONS

81POW

10/2024

12345 LAKELAND ROAD - SANTA FE SPRINGS, CALIFORNIA

FORMER POWERINE REFINERY

Groundwater Elevation in Feet

Above Mean Sea Level (MSL)

Groundwater Elevation in Feet Above

Dry Well(DRY)

MSL; Dashed Where Inferred

(34.55)

Not Located(NL)

Monitoring Well

Extraction Well

Not Measured(NM)

Powerine Oil Co Refinery - Western Portion

Geotracker Global ID T10000005705

Existing Monitoring Well for Former

Well Data Not Used For Contours

AutoCAD SHX Text

NORTH

MW-709

MW-711

W-4

MW-708

MW-707

MW-710

MW-604

MW-501AMW-502

W-3A

MW-600A MW-601A

MW-503B

(0.00)

(0.00)

(0.00)

(0.00) SV-23 SV-22

SV-21

SV-20

SV-19SV-18SV-17

SV-12

SV-9

SV-10 SV-8

SV-7

SV-6

SV-4

SV-5

SV-1

SV-2

SV-3

SV-14

SV-13

SV-16

SV-15

SV-11

5 4

7 8 9

SV-1

Depth (ft bgs)

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

Depth (ft bgs)

7.5

Benzene Ethylbenzene (μg/m³)

Oxygen

SV-3

Depth (ft bgs)

22.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

ND<6.2

ND<6.7

ND<8.4

ND<9.1

SV-4

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

ND<5.4

ND<6.5

ND<8.8

SV-5

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

5.6

ND<6

ND<8.1

SV-10

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

ND<6.5

8.7 4.5

SV-11

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

SV-12

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

ND<5.8

ND<5.4

ND<7.8

ND<7.3

SV-13

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

ND<6

ND<8.1

SV-14

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

ND<5.6

ND<5.6

ND<7.6

16SV-19

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

ND<6

ND<6.2

ND<8.1

ND<8.4

SV-20

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

ND<6.7

ND<6.2

ND<9.1

ND<8.4

SV-21

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

ND<5.4

ND<6.5

ND<9.1

ND<8.4

ND<0.5

SV-22

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

ND<6.2

ND<6.5

ND<8.4

ND<8.8

SV-23

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

ND<6.2

ND<6.2

ND<8.4

ND<8.4

SV-6

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

ND<6.2

ND<6.2

ND<8.4

SV-7

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

ND<6.2

ND<6.5

SV-8

Depth (ft bgs)

22.5

Ethylbenzene (μg/m³)

Oxygen

SV-9

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

8.9

SV-15

Depth (ft bgs)

22.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

ND<5.8

ND<5.8

ND<7.8

SV-16

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

SV-17

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

ND<6.5

ND<6.5

ND<8.1

ND<8.8

SV-18

Depth (ft bgs)

7.5

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

ND<7

ND<6.7

ND<9.5

ND<9.1

7.5

ND<6

ND<8.1

SV-2

(μg/m³)

ND<6.5

ND<8.8

Benzene (μg/m³)

ND<5.9

ND<6.2

6.4

ND<729

ND<6.5

EX-1

EX-4 EX-3 EX-2

SOIL VAPOR ANALYTICAL RESULTS

Legend

Long Beach, California 90806

(562) 988-2755

Orion Environmental Inc.

2955 Redondo Avenue

FIGURE 4

PROJECT

81POW-DATA5.dwg

DATE

APPROXIMATE SCALE IN FEET

0 240 480

81POW

01/2024

12345 LAKELAND ROAD - SANTA FE SPRINGS, CALIFORNIA

FORMER POWERINE REFINERY

MW-701

MW-201

EXISTING MONITORING WELL (POWERINE)

EXISTING MONITORING WELL (POWERINE) -

APPROXIMATE AREA OF RESIDUAL LNAPL

MEASURED LNAPL THICKNESS (FEET) ON(0.00)

VAPOR PROBE LOCATIONSSV-21

11 BUILDING NUMBER

SOIL VAPOR ANALYTICAL RESULTS FOR VOLATILE ORGANIC

COMPOUNDS; REPORTED IN MICROGRAMS PER CUBIC METER (μg/m³)

AND FIXED GASES; REPORTED IN VOLUME/VOLUME PERCENT (%).

SAMPLING DEPTHS REPORTED IN FEET BELOW GROUND SURFACE (FT

BGS). HIGHLIGHTED AND BOLDED VALUES INDICATE A DETECTION

GREATER THAN OR EQUAL TO SCREENING LEVELS FOR RESIDENTIAL

OR COMMERCIAL/INDUSTRIAL LAND USE.

DRY DURING CURRENT PERIOD

19 DECEMBER 2023

SV-1

Depth (ft bgs)

Benzene (μg/m³)

Ethylbenzene (μg/m³)

Oxygen

7.5

ND<6

ND<8.1

EXISTING EXTRACTION WELLEX-1

5.6

12 110

Department of State Hospitals Draft Final EIR January April 2019

DSH-Metropolitan Consolidation of Police Operations

Figure 3-6: Project Aerial View

N

300 Feet

XXXX

C1.1

1" = 30'

OVERALL SITE

PLAN

JDCECEJD

000000000002853

C op yr ig ht

2, C al ifo rn ia

D ep ar tm en t o f G en er al

S er vi ce s

- R ea l E st at e Se rv ic es D iv is io n

Project Manager: ...

916 376 - .... Fax 916 376 - .... Voice

...@dgs.ca.gov

Department of General Services

Emergency Generator

Manual Swing Gate Secured Fleet Parking

Police Kiosk

Security Arm Gate and Card Reader

Signal

Sixth Street

Staff and Visitor Parking

Brandon Whalen Cross-Out

Brandon Whalen Cross-Out

APPENDIX B

Geocon Consultants, Inc. - San Diego

San Diego, CA 92121 6970 Flanders Drive

Marci Richards

Enclosed is the analytical report for the above referenced project. The data herein applies to samples as received by H&P Mobile Geochemistry, Inc. on 25-Apr-25 which were analyzed in accordance with the attached Chain of Custody record(s).

The results for all sample analyses and required QA/QC analyses are presented in the following sections and summarized in the documents:

• Sample Summary

• Case Narrative (if applicable)

• Sample Results

• Quality Control Summary

• Notes and Definitions / Appendix

• Chain of Custody

• Sampling Logs (if applicable)

Unless otherwise noted, I certify that all analyses were performed and reviewed in compliance with our Quality Systems Manual and Standard Operating Procedures. This report shall not be reproduced, except in full, without the written approval of H&P Mobile Geochemistry, Inc.

We at H&P Mobile Geochemistry, Inc. sincerely appreciate the opportunity to provide analytical services to you on this project. If you have any questions or concerns regarding this analytical report, please contact me at your convenience at 760-804-9678.

Sincerely, 08 May 2025

Lisa Eminhizer

Laboratory Director

H&P Mobile Geochemistry, Inc. is accredited under the National Laboratory Accreditation Program (NELAP) and the Department of Defense

Environmental Laboratory Accreditation Program (DoD-ELAP), operating in accordance with international standard ISO/IEC 17025:2005 for the fields of proficiency and analytes listed on the applicable certificates. The certificates for EPA Method TO-15 and H&P Method 8260SV (modified

EPA 8260B) can be found at www.handpmg.com, including accreditation certificate numbers, expiration of certificates, and scope of accreditation including matrix of accreditation. Vehicle Identification Numbers are included on the certifications for mobile lab analysis , if applicable. Fields of services and analytes contained in this report that are not listed on the certificates should be considered uncertified or unavailable for certification.

Client Project: 11401 Bloomfield

H&P Project: GC042925-12 Rev 1

Dear Marci Richards:

P 1.800.834.9888 / 760.804.9678 F 760.804.9159 W handpmg.com

2470 Impala Drive, Carlsbad, CA 92010 & Field Office - Signal Hill, CAQuality. Accuracy. Experience.

Geochemistry Inc.

Mobile

Project:

Project Number:

Project Manager:

Reported:

Geocon Consultants, Inc. - San Diego

6970 Flanders Drive

GC042925-12 Rev 1

11401 Bloomfield

Marci RichardsSan Diego, CA 92121 08-May-25 13:34

2470 Impala Drive

Carlsbad, CA 92010

760-804-9678 Phone

760-804-9159 Fax

H&P Mobile Geochemistry Inc.

Sample ID Laboratory ID Matrix Date Sampled

ANALYTICAL REPORT FOR SAMPLES

Date Received

SV1-10 E504094-01 Vapor 25-Apr-25 25-Apr-25

SV1-5 E504094-02 Vapor 25-Apr-25 25-Apr-25

SV3-5 E504094-03 Vapor 25-Apr-25 25-Apr-25

SV3-10 E504094-04 Vapor 25-Apr-25 25-Apr-25

SV2-5 E504094-05 Vapor 25-Apr-25 25-Apr-25

SV2-10 E504094-06 Vapor 25-Apr-25 25-Apr-25

SV2-5 REP E504094-07 Vapor 25-Apr-25 25-Apr-25

SV4-5 E504094-08 Vapor 25-Apr-25 25-Apr-25

SV4-10 E504094-09 Vapor 25-Apr-25 25-Apr-25

May 8, 2025 (Rev 1): This final has been revised to report only the requested analyses.

Project Manager:

Reported:

Geocon Consultants, Inc. - San Diego

6970 Flanders Drive

GC042925-12 Rev 1

11401 Bloomfield

Marci RichardsSan Diego, CA 92121 08-May-25 13:34

2470 Impala Drive

Carlsbad, CA 92010

760-804-9678 Phone

760-804-9159 Fax

H&P Mobile Geochemistry Inc.

DETECTIONS SUMMARY

Sample ID: Laboratory ID:

Analyte Result Limit Units Method

E504094-01SV1-10

Notes

Reporting

Carbon disulfide 5.7 1.3 ug/m3 EPA TO-15

2-Butanone (MEK) 29 2.4 ug/m3 EPA TO-15

Chloroform 4.8 1.0 ug/m3 EPA TO-15

Benzene 2.7 0.6 ug/m3 EPA TO-15

4-Methyl-2-pentanone (MIBK) 11 3.3 ug/m3 EPA TO-15

Toluene 4.7 3.1 ug/m3 EPA TO-15

Tetrachloroethene 4.8 2.8 ug/m3 EPA TO-15

Ethylbenzene 13 1.8 ug/m3 EPA TO-15 m,p-Xylene 46 1.8 ug/m3 EPA TO-15 QL-1H o-Xylene 18 1.8 ug/m3 EPA TO-15

1,2,4-Trimethylbenzene 3.5 2.0 ug/m3 EPA TO-15

Sample ID: Laboratory ID:

Analyte Result Limit Units Method

E504094-02SV1-5

Notes

Reporting

1,1-Difluoroethane (LCC) 11 2.2 ug/m3 EPA TO-15

Methylene chloride (Dichloromethane) 6.9 1.4 ug/m3 EPA TO-15

Carbon disulfide 14 1.3 ug/m3 EPA TO-15

2-Butanone (MEK) 45 2.4 ug/m3 EPA TO-15

Chloroform 5.1 1.0 ug/m3 EPA TO-15

Benzene 15 0.6 ug/m3 EPA TO-15

4-Methyl-2-pentanone (MIBK) 11 3.3 ug/m3 EPA TO-15

Toluene 25 3.1 ug/m3 EPA TO-15

Tetrachloroethene 4.5 2.8 ug/m3 EPA TO-15

Ethylbenzene 61 1.8 ug/m3 EPA TO-15 m,p-Xylene 150 1.8 ug/m3 EPA TO-15 QL-1H o-Xylene 64 1.8 ug/m3 EPA TO-15

Sample ID: Laboratory ID:

Analyte Result Limit Units Method

E504094-03SV3-5

Notes

Reporting

Trichlorofluoromethane (F11) 3.7 2.3 ug/m3 EPA TO-15

Carbon disulfide 3.4 1.3 ug/m3 EPA TO-15

2-Butanone (MEK) 12 2.4 ug/m3 EPA TO-15

Chloroform 1.6 1.0 ug/m3 EPA TO-15

Benzene 4.1 0.6 ug/m3 EPA TO-15

4-Methyl-2-pentanone (MIBK) 4.0 3.3 ug/m3 EPA TO-15

Project Manager:

Reported:

Geocon Consultants, Inc. - San Diego

6970 Flanders Drive

GC042925-12 Rev 1

11401 Bloomfield

Marci RichardsSan Diego, CA 92121 08-May-25 13:34

2470 Impala Drive

Carlsbad, CA 92010

760-804-9678 Phone

760-804-9159 Fax

H&P Mobile Geochemistry Inc.

Sample ID: Laboratory ID:

Analyte Result Limit Units Method

E504094-03SV3-5

Notes

Reporting

Toluene 9.7 3.1 ug/m3 EPA TO-15

Ethylbenzene 4.2 1.8 ug/m3 EPA TO-15 m,p-Xylene 15 1.8 ug/m3 EPA TO-15 QL-1H o-Xylene 6.0 1.8 ug/m3 EPA TO-15

Sample ID: Laboratory ID:

Analyte Result Limit Units Method

E504094-04SV3-10

Notes

Reporting

Trichlorofluoromethane (F11) 5.0 2.3 ug/m3 EPA TO-15

Carbon disulfide 5.3 1.3 ug/m3 EPA TO-15

2-Butanone (MEK) 11 2.4 ug/m3 EPA TO-15

Chloroform 3.2 1.0 ug/m3 EPA TO-15

Benzene 5.7 0.6 ug/m3 EPA TO-15

4-Methyl-2-pentanone (MIBK) 5.5 3.3 ug/m3 EPA TO-15

Toluene 10 3.1 ug/m3 EPA TO-15

Ethylbenzene 13 1.8 ug/m3 EPA TO-15 m,p-Xylene 47 1.8 ug/m3 EPA TO-15 QL-1H o-Xylene 18 1.8 ug/m3 EPA TO-15

1,2,4-Trimethylbenzene 2.0 2.0 ug/m3 EPA TO-15

Sample ID: Laboratory ID:

Analyte Result Limit Units Method

E504094-05SV2-5

Notes

Reporting

Methylene chloride (Dichloromethane) 2.1 1.4 ug/m3 EPA TO-15

Carbon disulfide 2.2 1.3 ug/m3 EPA TO-15

2-Butanone (MEK) 7.1 2.4 ug/m3 EPA TO-15

Chloroform 13 1.0 ug/m3 EPA TO-15

Benzene 4.9 0.6 ug/m3 EPA TO-15

4-Methyl-2-pentanone (MIBK) 4.4 3.3 ug/m3 EPA TO-15

Toluene 17 3.1 ug/m3 EPA TO-15

Ethylbenzene 7.3 1.8 ug/m3 EPA TO-15 m,p-Xylene 25 1.8 ug/m3 EPA TO-15 QL-1H o-Xylene 12 1.8 ug/m3 EPA TO-15

4-Ethyltoluene 3.6 2.0 ug/m3 EPA TO-15

1,3,5-Trimethylbenzene 4.5 2.0 ug/m3 EPA TO-15

1,2,4-Trimethylbenzene 15 2.0 ug/m3 EPA TO-15

Project Manager:

Reported:

Geocon Consultants, Inc. - San Diego

6970 Flanders Drive

GC042925-12 Rev 1

11401 Bloomfield

Marci RichardsSan Diego, CA 92121 08-May-25 13:34

2470 Impala Drive

Carlsbad, CA 92010

760-804-9678 Phone

760-804-9159 Fax

H&P Mobile Geochemistry Inc.

Sample ID: Laboratory ID:

Analyte Result Limit Units Method

E504094-06SV2-10

Notes

Reporting

Carbon disulfide 3.7 1.3 ug/m3 EPA TO-15

2-Butanone (MEK) 9.4 2.4 ug/m3 EPA TO-15

Chloroform 20 1.0 ug/m3 EPA TO-15

Benzene 4.6 0.6 ug/m3 EPA TO-15

4-Methyl-2-pentanone (MIBK) 6.0 3.3 ug/m3 EPA TO-15

Toluene 11 3.1 ug/m3 EPA TO-15

Ethylbenzene 11 1.8 ug/m3 EPA TO-15 m,p-Xylene 45 1.8 ug/m3 EPA TO-15 QL-1H o-Xylene 21 1.8 ug/m3 EPA TO-15

1,2,4-Trimethylbenzene 2.3 2.0 ug/m3 EPA TO-15

Sample ID: Laboratory ID:

Analyte Result Limit Units Method

E504094-07SV2-5 REP

Notes

Reporting

Methylene chloride (Dichloromethane) 1.9 1.4 ug/m3 EPA TO-15

Carbon disulfide 2.0 1.3 ug/m3 EPA TO-15

2-Butanone (MEK) 8.0 2.4 ug/m3 EPA TO-15

Chloroform 14 1.0 ug/m3 EPA TO-15

Benzene 4.6 0.6 ug/m3 EPA TO-15

4-Methyl-2-pentanone (MIBK) 3.4 3.3 ug/m3 EPA TO-15

Toluene 15 3.1 ug/m3 EPA TO-15

Ethylbenzene 4.1 1.8 ug/m3 EPA TO-15 m,p-Xylene 15 1.8 ug/m3 EPA TO-15 QL-1H o-Xylene 6.9 1.8 ug/m3 EPA TO-15

1,2,4-Trimethylbenzene 2.4 2.0 ug/m3 EPA TO-15

Sample ID: Laboratory ID:

Analyte Result Limit Units Method

E504094-08SV4-5

Notes

Reporting

Chloromethane 1.4 0.8 ug/m3 EPA TO-15

Methylene chloride (Dichloromethane) 3.0 1.4 ug/m3 EPA TO-15

Carbon disulfide 7.4 1.3 ug/m3 EPA TO-15

2-Butanone (MEK) 45 2.4 ug/m3 EPA TO-15

Chloroform 1.3 1.0 ug/m3 EPA TO-15

Benzene 12 0.6 ug/m3 EPA TO-15

4-Methyl-2-pentanone (MIBK) 12 3.3 ug/m3 EPA TO-15

Toluene 27 3.1 ug/m3 EPA TO-15

Ethylbenzene 25 1.8 ug/m3 EPA TO-15 m,p-Xylene 92 1.8 ug/m3 EPA TO-15 QL-1H

Project Manager:

Reported:

Geocon Consultants, Inc. - San Diego

6970 Flanders Drive

GC042925-12 Rev 1

11401 Bloomfield

Marci RichardsSan Diego, CA 92121 08-May-25 13:34

2470 Impala Drive

Carlsbad, CA 92010

760-804-9678 Phone

760-804-9159 Fax

H&P Mobile Geochemistry Inc.

Sample ID: Laboratory ID:

Analyte Result Limit Units Method

E504094-08SV4-5

Notes

Reporting

Styrene 7.5 1.7 ug/m3 EPA TO-15 o-Xylene 45 1.8 ug/m3 EPA TO-15

1,2,4-Trimethylbenzene 3.3 2.0 ug/m3 EPA TO-15

Sample ID: Laboratory ID:

Analyte Result Limit Units Method

E504094-09SV4-10

Notes

Reporting

Carbon disulfide 2.5 1.3 ug/m3 EPA TO-15

2-Butanone (MEK) 4.7 2.4 ug/m3 EPA TO-15

Benzene 1.5 0.6 ug/m3 EPA TO-15

Tetrachloroethene 38 2.8 ug/m3 EPA TO-15

Project Manager:

Reported:

Geocon Consultants, Inc. - San Diego

6970 Flanders Drive

GC042925-12 Rev 1

11401 Bloomfield

Marci RichardsSan Diego, CA 92121 08-May-25 13:34

2470 Impala Drive

Carlsbad, CA 92010

760-804-9678 Phone

760-804-9159 Fax

H&P Mobile Geochemistry Inc.

VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15

H&P Mobile Geochemistry, Inc.

Result Analyte Limit

Reporting

Units

Dilution

Batch Prepared Analyzed Method Notes Factor

SV1-10 (E504094-01) Vapor Sampled: 25-Apr-25 Received: 25-Apr-25

EPA TO-1502-May-25 02-May-25ug/m3 EE5020111,1-Difluoroethane (LCC) 2.2ND "" "" ""Dichlorodifluoromethane (F12) 4.0ND "" "" ""Chloromethane 0.8ND "" "" ""Dichlorotetrafluoroethane (F114) 2.8ND "" "" ""Vinyl chloride 0.5ND "" "" ""Bromomethane 1.6ND "" "" ""Chloroethane 1.6ND "" "" ""Trichlorofluoromethane (F11) 2.3ND "" "" ""1,1-Dichloroethene 1.6ND "" "" ""1,1,2-Trichlorotrifluoroethane (F113) 3.1ND "" "" ""Methylene chloride (Dichloromethane) 1.4ND

" " "" "Carbon disulfide "1.35.7 "" "" ""trans-1,2-Dichloroethene 1.6ND "" "" ""1,1-Dichloroethane 1.6ND

" " "" "2-Butanone (MEK) "2.429 "" "" ""cis-1,2-Dichloroethene 1.6ND

" " "" "Chloroform "1.04.8 "" "" ""1,1,1-Trichloroethane 2.2ND "" "" ""1,2-Dichloroethane (EDC) 1.6ND

" " "" "Benzene "0.62.7 "" "" ""Carbon tetrachloride 1.3ND "" "" ""Trichloroethene 2.2ND "" "" ""1,2-Dichloropropane 1.9ND "" "" ""Bromodichloromethane 2.7ND "" "" ""cis-1,3-Dichloropropene 1.8ND

" " "" "4-Methyl-2-pentanone (MIBK) "3.311 "" "" ""trans-1,3-Dichloropropene 1.8ND

" " "" "Toluene "3.14.7 "" "" ""1,1,2-Trichloroethane 2.2ND "" "" ""2-Hexanone (MBK) 3.3ND "" "" ""Dibromochloromethane 3.5ND

" " "" "Tetrachloroethene "2.84.8 "" "" ""1,2-Dibromoethane (EDB) 3.1ND "" "" ""1,1,1,2-Tetrachloroethane 2.8ND "" "" ""Chlorobenzene 1.9ND

" " "" "Ethylbenzene "1.813 " " "" "m,p-Xylene QL-1H"1.846

"" "" ""Styrene 1.7ND

Project Manager:

Reported:

Geocon Consultants, Inc. - San Diego

6970 Flanders Drive

GC042925-12 Rev 1

11401 Bloomfield

Marci RichardsSan Diego, CA 92121 08-May-25 13:34

2470 Impala Drive

Carlsbad, CA 92010

760-804-9678 Phone

760-804-9159 Fax

H&P Mobile Geochemistry Inc.

VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15

H&P Mobile Geochemistry, Inc.

Result Analyte Limit

Reporting

Units

Dilution

Batch Prepared Analyzed Method Notes Factor

SV1-10 (E504094-01) Vapor Sampled: 25-Apr-25 Received: 25-Apr-25

EE50201 02-May-25 02-May-25ug/m3 1o-Xylene EPA TO-151.818 "" "" ""Bromoform 4.2ND "" "" ""1,1,2,2-Tetrachloroethane 2.8ND "" "" ""4-Ethyltoluene 2.0ND "" "" ""1,3,5-Trimethylbenzene 2.0ND

" " "" "1,2,4-Trimethylbenzene "2.03.5 "" "" ""1,3-Dichlorobenzene 2.4ND "" "" ""1,4-Dichlorobenzene 2.4ND "" "" ""1,2-Dichlorobenzene 2.4ND "" "" ""1,2,4-Trichlorobenzene 7.5ND "" "" ""Hexachlorobutadiene 11ND

" " " "103 % 76-134Surrogate: 1,2-Dichloroethane-d4

" " " "104 % 78-125Surrogate: Toluene-d8

" " " "97.0 % 77-127Surrogate: 4-Bromofluorobenzene

SV1-5 (E504094-02) Vapor Sampled: 25-Apr-25 Received: 25-Apr-25

EE50201 02-May-25 02-May-25ug/m3 11,1-Difluoroethane (LCC) EPA TO-152.211 "" "" ""Dichlorodifluoromethane (F12) 4.0ND "" "" ""Chloromethane 0.8ND "" "" ""Dichlorotetrafluoroethane (F114) 2.8ND "" "" ""Vinyl chloride 0.5ND "" "" ""Bromomethane 1.6ND "" "" ""Chloroethane 1.6ND "" "" ""Trichlorofluoromethane (F11) 2.3ND "" "" ""1,1-Dichloroethene 1.6ND "" "" ""1,1,2-Trichlorotrifluoroethane (F113) 3.1ND

" " "" "Methylene chloride (Dichloromethane) "1.46.9 " " "" "Carbon disulfide "1.314

"" "" ""trans-1,2-Dichloroethene 1.6ND "" "" ""1,1-Dichloroethane 1.6ND

" " "" "2-Butanone (MEK) "2.445 "" "" ""cis-1,2-Dichloroethene 1.6ND

" " "" "Chloroform "1.05.1 "" "" ""1,1,1-Trichloroethane 2.2ND "" "" ""1,2-Dichloroethane (EDC) 1.6ND

" " "" "Benzene "0.615 "" "" ""Carbon tetrachloride 1.3ND

Project Manager:

Reported:

Geocon Consultants, Inc. - San Diego

6970 Flanders Drive

GC042925-12 Rev 1

11401 Bloomfield

Marci RichardsSan Diego, CA 92121 08-May-25 13:34

2470 Impala Drive

Carlsbad, CA 92010

760-804-9678 Phone

760-804-9159 Fax

H&P Mobile Geochemistry Inc.

VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15

H&P Mobile Geochemistry, Inc.

Result Analyte Limit

Reporting

Units

Dilution

Batch Prepared Analyzed Method Notes Factor

SV1-5 (E504094-02) Vapor Sampled: 25-Apr-25 Received: 25-Apr-25

EPA TO-1502-May-25 02-May-25ug/m3 EE502011Trichloroethene 2.2ND "" "" ""1,2-Dichloropropane 1.9ND "" "" ""Bromodichloromethane 2.7ND "" "" ""cis-1,3-Dichloropropene 1.8ND

" " "" "4-Methyl-2-pentanone (MIBK) "3.311 "" "" ""trans-1,3-Dichloropropene 1.8ND

" " "" "Toluene "3.125 "" "" ""1,1,2-Trichloroethane 2.2ND "" "" ""2-Hexanone (MBK) 3.3ND "" "" ""Dibromochloromethane 3.5ND

" " "" "Tetrachloroethene "2.84.5 "" "" ""1,2-Dibromoethane (EDB) 3.1ND "" "" ""1,1,1,2-Tetrachloroethane 2.8ND "" "" ""Chlorobenzene 1.9ND

" " "" "Ethylbenzene "1.861 " " "" "m,p-Xylene QL-1H"1.8150

"" "" ""Styrene 1.7ND " " "" "o-Xylene "1.864

"" "" ""Bromoform 4.2ND "" "" ""1,1,2,2-Tetrachloroethane 2.8ND "" "" ""4-Ethyltoluene 2.0ND "" "" ""1,3,5-Trimethylbenzene 2.0ND "" "" ""1,2,4-Trimethylbenzene 2.0ND "" "" ""1,3-Dichlorobenzene 2.4ND "" "" ""1,4-Dichlorobenzene 2.4ND "" "" ""1,2-Dichlorobenzene 2.4ND "" "" ""1,2,4-Trichlorobenzene 7.5ND "" "" ""Hexachlorobutadiene 11ND

" " " "102 % 76-134Surrogate: 1,2-Dichloroethane-d4

" " " "102 % 78-125Surrogate: Toluene-d8

" " " "89.4 % 77-127Surrogate: 4-Bromofluorobenzene

Project Manager:

Reported:

Geocon Consultants, Inc. - San Diego

6970 Flanders Drive

GC042925-12 Rev 1

11401 Bloomfield

Marci RichardsSan Diego, CA 92121 08-May-25 13:34

2470 Impala Drive

Carlsbad, CA 92010

760-804-9678 Phone

760-804-9159 Fax

H&P Mobile Geochemistry Inc.

VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15

H&P Mobile Geochemistry, Inc.

Result Analyte Limit

Reporting

Units

Dilution

Batch Prepared Analyzed Method Notes Factor

SV3-5 (E504094-03) Vapor Sampled: 25-Apr-25 Received: 25-Apr-25

EPA TO-1502-May-25 02-May-25ug/m3 EE5020111,1-Difluoroethane (LCC) 2.2ND "" "" ""Dichlorodifluoromethane (F12) 4.0ND "" "" ""Chloromethane 0.8ND "" "" ""Dichlorotetrafluoroethane (F114) 2.8ND "" "" ""Vinyl chloride 0.5ND "" "" ""Bromomethane 1.6ND "" "" ""Chloroethane 1.6ND

" " "" "Trichlorofluoromethane (F11) "2.33.7 "" "" ""1,1-Dichloroethene 1.6ND "" "" ""1,1,2-Trichlorotrifluoroethane (F113) 3.1ND "" "" ""Methylene chloride (Dichloromethane) 1.4ND

" " "" "Carbon disulfide "1.33.4 "" "" ""trans-1,2-Dichloroethene 1.6ND "" "" ""1,1-Dichloroethane 1.6ND

" " "" "2-Butanone (MEK) "2.412 "" "" ""cis-1,2-Dichloroethene 1.6ND

" " "" "Chloroform "1.01.6 "" "" ""1,1,1-Trichloroethane 2.2ND "" "" ""1,2-Dichloroethane (EDC) 1.6ND

" " "" "Benzene "0.64.1 "" "" ""Carbon tetrachloride 1.3ND "" "" ""Trichloroethene 2.2ND "" "" ""1,2-Dichloropropane 1.9ND "" "" ""Bromodichloromethane 2.7ND "" "" ""cis-1,3-Dichloropropene 1.8ND

" " "" "4-Methyl-2-pentanone (MIBK) "3.34.0 "" "" ""trans-1,3-Dichloropropene 1.8ND

" " "" "Toluene "3.19.7 "" "" ""1,1,2-Trichloroethane 2.2ND "" "" ""2-Hexanone (MBK) 3.3ND "" "" ""Dibromochloromethane 3.5ND "" "" ""Tetrachloroethene 2.8ND "" "" ""1,2-Dibromoethane (EDB) 3.1ND "" "" ""1,1,1,2-Tetrachloroethane 2.8ND "" "" ""Chlorobenzene 1.9ND

" " "" "Ethylbenzene "1.84.2 " " "" "m,p-Xylene QL-1H"1.815

Project Manager:

Reported:

Geocon Consultants, Inc. - San Diego

6970 Flanders Drive

GC042925-12 Rev 1

11401 Bloomfield

Marci RichardsSan Diego, CA 92121 08-May-25 13:34

2470 Impala Drive

Carlsbad, CA 92010

760-804-9678 Phone

760-804-9159 Fax

H&P Mobile Geochemistry Inc.

VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15

H&P Mobile Geochemistry, Inc.

Result Analyte Limit

Reporting

Units

Dilution

Batch Prepared Analyzed Method Notes Factor

SV3-5 (E504094-03) Vapor Sampled: 25-Apr-25 Received: 25-Apr-25

EE50201 02-May-25 02-May-25ug/m3 1o-Xylene EPA TO-151.86.0 "" "" ""Bromoform 4.2ND "" "" ""1,1,2,2-Tetrachloroethane 2.8ND "" "" ""4-Ethyltoluene 2.0ND "" "" ""1,3,5-Trimethylbenzene 2.0ND "" "" ""1,2,4-Trimethylbenzene 2.0ND "" "" ""1,3-Dichlorobenzene 2.4ND "" "" ""1,4-Dichlorobenzene 2.4ND "" "" ""1,2-Dichlorobenzene 2.4ND "" "" ""1,2,4-Trichlorobenzene 7.5ND "" "" ""Hexachlorobutadiene 11ND

" " " "101 % 76-134Surrogate: 1,2-Dichloroethane-d4

" " " "108 % 78-125Surrogate: Toluene-d8

" " " "101 % 77-127Surrogate: 4-Bromofluorobenzene

SV3-10 (E504094-04) Vapor Sampled: 25-Apr-25 Received: 25-Apr-25

EPA TO-1502-May-25 02-May-25ug/m3 EE5020111,1-Difluoroethane (LCC) 2.2ND "" "" ""Dichlorodifluoromethane (F12) 4.0ND "" "" ""Chloromethane 0.8ND "" "" ""Dichlorotetrafluoroethane (F114) 2.8ND "" "" ""Vinyl chloride 0.5ND "" "" ""Bromomethane 1.6ND "" "" ""Chloroethane 1.6ND

" " "" "Trichlorofluoromethane (F11) "2.35.0 "" "" ""1,1-Dichloroethene 1.6ND "" "" ""1,1,2-Trichlorotrifluoroethane (F113) 3.1ND "" "" ""Methylene chloride (Dichloromethane) 1.4ND

" " "" "Carbon disulfide "1.35.3 "" "" ""trans-1,2-Dichloroethene 1.6ND "" "" ""1,1-Dichloroethane 1.6ND

" " "" "2-Butanone (MEK) "2.411 "" "" ""cis-1,2-Dichloroethene 1.6ND

" " "" "Chloroform "1.03.2 "" "" ""1,1,1-Trichloroethane 2.2ND "" "" ""1,2-Dichloroethane (EDC) 1.6ND

" " "" "Benzene "0.65.7

Project Manager:

Reported:

Geocon Consultants, Inc. - San Diego

6970 Flanders Drive

GC042925-12 Rev 1

11401 Bloomfield

Marci RichardsSan Diego, CA 92121 08-May-25 13:34

2470 Impala Drive

Carlsbad, CA 92010

760-804-9678 Phone

760-804-9159 Fax

H&P Mobile Geochemistry Inc.

VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15

H&P Mobile Geochemistry, Inc.

Result Analyte Limit

Reporting

Units

Dilution

Batch Prepared Analyzed Method Notes Factor

SV3-10 (E504094-04) Vapor Sampled: 25-Apr-25 Received: 25-Apr-25

EPA TO-1502-May-25 02-May-25ug/m3 EE502011Trichloroethene 2.2ND "" "" ""1,2-Dichloropropane 1.9ND "" "" ""Bromodichloromethane 2.7ND "" "" ""cis-1,3-Dichloropropene 1.8ND

" " "" "4-Methyl-2-pentanone (MIBK) "3.35.5 "" "" ""trans-1,3-Dichloropropene 1.8ND

" " "" "Toluene "3.110 "" "" ""1,1,2-Trichloroethane 2.2ND "" "" ""2-Hexanone (MBK) 3.3ND "" "" ""Dibromochloromethane 3.5ND "" "" ""Tetrachloroethene 2.8ND "" "" ""1,2-Dibromoethane (EDB) 3.1ND "" "" ""1,1,1,2-Tetrachloroethane 2.8ND "" "" ""Chlorobenzene 1.9ND

" " "" "Ethylbenzene "1.813 " " "" "m,p-Xylene QL-1H"1.847

"" "" ""Styrene 1.7ND " " "" "o-Xylene "1.818

"" "" ""Bromoform 4.2ND "" "" ""1,1,2,2-Tetrachloroethane 2.8ND "" "" ""4-Ethyltoluene 2.0ND "" "" ""1,3,5-Trimethylbenzene 2.0ND

" " "" "1,2,4-Trimethylbenzene "2.02.0 "" "" ""1,3-Dichlorobenzene 2.4ND "" "" ""1,4-Dichlorobenzene 2.4ND "" "" ""1,2-Dichlorobenzene 2.4ND "" "" ""1,2,4-Trichlorobenzene 7.5ND "" "" ""Hexachlorobutadiene 11ND

" " " "100 % 76-134Surrogate: 1,2-Dichloroethane-d4

" " " "106 % 78-125Surrogate: Toluene-d8

" " " "93.2 % 77-127Surrogate: 4-Bromofluorobenzene

Project Manager:

Reported:

Geocon Consultants, Inc. - San Diego

6970 Flanders Drive

GC042925-12 Rev 1

11401 Bloomfield

Marci RichardsSan Diego, CA 92121 08-May-25 13:34

2470 Impala Drive

Carlsbad, CA 92010

760-804-9678 Phone

760-804-9159 Fax

H&P Mobile Geochemistry Inc.

VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15

H&P Mobile Geochemistry, Inc.

Result Analyte Limit

Reporting

Units

Dilution

Batch Prepared Analyzed Method Notes Factor

SV2-5 (E504094-05) Vapor Sampled: 25-Apr-25 Received: 25-Apr-25

EPA TO-1502-May-25 02-May-25ug/m3 EE5020111,1-Difluoroethane (LCC) 2.2ND "" "" ""Dichlorodifluoromethane (F12) 4.0ND "" "" ""Chloromethane 0.8ND "" "" ""Dichlorotetrafluoroethane (F114) 2.8ND "" "" ""Vinyl chloride 0.5ND "" "" ""Bromomethane 1.6ND "" "" ""Chloroethane 1.6ND "" "" ""Trichlorofluoromethane (F11) 2.3ND "" "" ""1,1-Dichloroethene 1.6ND "" "" ""1,1,2-Trichlorotrifluoroethane (F113) 3.1ND

" " "" "Methylene chloride (Dichloromethane) "1.42.1 " " "" "Carbon disulfide "1.32.2

"" "" ""trans-1,2-Dichloroethene 1.6ND "" "" ""1,1-Dichloroethane 1.6ND

" " "" "2-Butanone (MEK) "2.47.1 "" "" ""cis-1,2-Dichloroethene 1.6ND

" " "" "Chloroform "1.013 "" "" ""1,1,1-Trichloroethane 2.2ND "" "" ""1,2-Dichloroethane (EDC) 1.6ND

" " "" "Benzene "0.64.9 "" "" ""Carbon tetrachloride 1.3ND "" "" ""Trichloroethene 2.2ND "" "" ""1,2-Dichloropropane 1.9ND "" "" ""Bromodichloromethane 2.7ND "" "" ""cis-1,3-Dichloropropene 1.8ND

" " "" "4-Methyl-2-pentanone (MIBK) "3.34.4 "" "" ""trans-1,3-Dichloropropene 1.8ND

" " "" "Toluene "3.117 "" "" ""1,1,2-Trichloroethane 2.2ND "" "" ""2-Hexanone (MBK) 3.3ND "" "" ""Dibromochloromethane 3.5ND "" "" ""Tetrachloroethene 2.8ND "" "" ""1,2-Dibromoethane (EDB) 3.1ND "" "" ""1,1,1,2-Tetrachloroethane 2.8ND "" "" ""Chlorobenzene 1.9ND

" " "" "Ethylbenzene "1.87.3 " " "" "m,p-Xylene QL-1H"1.825

Project Manager:

Reported:

Geocon Consultants, Inc. - San Diego

6970 Flanders Drive

GC042925-12 Rev 1

11401 Bloomfield

Marci RichardsSan Diego, CA 92121 08-May-25 13:34

2470 Impala Drive

Carlsbad, CA 92010

760-804-9678 Phone

760-804-9159 Fax

H&P Mobile Geochemistry Inc.

VOC Analysis by DoD-ELAP and NELAP Accredited EPA TO-15

H&P Mobile Geochemistry, Inc.

Result Analyte Limit

Reporting

Units

Dilution

Batch Prepared Analyzed Method Notes Factor

SV2-5 (E504094-05) Vapor Sampled: 25-Apr-25 Received: 25-Apr-25

EE50201 02-May-25 02-May-25ug/m3 1o-Xylene EPA TO-151.812 "" "" ""Bromoform 4.2ND "" "" ""1,1,2,2-Tetrachloroethane 2.8ND

" " "" "4-Ethyltoluene "2.03.6 " " "" "1,3,5-Trimethylbenzene "2.04.5 " " "" "1,2,4-Trimethylbenzene "2.015

"" "" ""1,3-Dichlorobenzene 2.4ND "" "" ""1,4-Dichlorobenzene 2.4ND "" "" ""1,2-Dichlorobenzene 2.4ND "" "" ""1,2,4-Trichlorobenzene 7.5ND "" "" ""Hexachlorobutadiene 11ND

" " " "101 % 76-134Surrogate: 1,2-Dichloroethane-d4

" " " "99.4 % 78-125Surrogate: Toluene-d8

" " " "96.4 % 77-127Surrogate: 4-Bromofluorobenzene

SV2-10 (E504094-06) Vapor Sampled: 25-Apr-25 Received: 25-Apr-25

EPA TO-1502-May-25 03-May-25ug/m3 EE5020111,1-Difluoroethane (LCC) 2.2ND "" "" ""Dichlorodifluoromethane (F12) 4.0ND "" "" ""Chloromethane 0.8ND "" "" ""Dichlorotetrafluoroethane (F114) 2.8ND "" "" ""Vinyl chloride 0.5ND "" "" ""Bromomethane 1.6ND "" "" ""Chloroethane 1.6ND "" "" ""Trichlorofluoromethane (F11) 2.3ND "" "" ""1,1-Dichloroethene 1.6ND "" "" ""1,1,2-Trichlorotrifluoroethane (F113) 3.1ND "" "" ""Methylene chloride (Dichloromethane) 1.4ND

" " "" "Carbon disulfide "1.33.7 "" "" ""trans-1,2-Dichloroethene 1.6ND "" "" ""1,1-Dichloroethane 1.6ND

" " "" "2-Butanone (MEK) "2.49.4 "" "" ""cis-1,2-Dichloroethene 1.6ND

" " "" "Chloroform "1.020 "" "" ""1,1,1-Trichloroethane 2.2ND "" "" ""1,2-Dichloroethane (EDC) 1.6ND

" " "" "Benzene "0.64.6

Project Manager:

Reported:

Geocon Consultants, Inc. - San Diego

6970 Flanders Drive

GC042925-12 Rev 1

11401 Bloomfield

Marci RichardsSan Diego, CA 92121 08-May-25 13:34

2470 Impala Drive

Carlsbad, CA 92010

760-804-9678 Phone

760-804-9159 Fax

H&P Mobile Geochemistry Inc.

VOC…