Attachment 6 - Environmental Monitoring Report.pdf — South San Francisco City Council, April 29, 2025

Soil Vapor Monitoring Report – Fourth Quarter 2024
City of South San Francisco
Municipal Services Building and Social Hall
33 Arroyo Drive
South San Francisco, California
City of South San Francisco
400 Grand Avenue | South San Francisco, California 94080 April 23, 2025 | Project No. 403151011
Geotechnical | Environmental | Construction Inspection & Testing | Forensic Engineering & Expert Witness Geophysics | Engineering Geology | Laboratory Testing | Industrial Hygiene | Occupational Safety | Air Quality | GIS 1301 Marina Village Parkway, Suite 110 | Alameda, CA 94501| p. 510.343.3000 | www.ninyoandmoore.com Soil Vapor Monitoring Report - Fourth Quarter 2024
City of South San Francisco
Municipal Services Building and Social Hall
33 Arroyo Drive
South San Francisco, California
Ms. Nell Selander
Director Economic & Community Development Department
City of South San Francisco
Economic and Community Development Department
400 Grand Avenue | South San Francisco, California 94080 April 23, 2025 | Project No. 403151011
Lev Shnaider Aubrey K. Cool, PG 7659
Staff Environmental Scientist Principal Geologist
Gregory B. Roberts
Project Environmental Scientist
LXS/GBR/AKC/gvr
Ninyo & Moore | 33 Arroyo Drive, South San Francisco, California | 403151011 | April 23, 2025 i

CONTENTS
1 INTRODUCTION 1
2 BACKGROUND 1

2.1 Site Description 1

2.2 Site Geology 1

2.3 Previous Work 1
3 SOIL VAPOR SAMPLING ACTIVITIES 3

3.1 Sampling Procedures 3

3.2 Laboratory Analyses 4
4 SOIL VAPOR SAMPLING RESULTS 4

4.1 Volatile Organic Compounds 4

4.2 Leak Detection Agent 5

4.3 Fixed Gases 5
5 CONCLUSIONS 5
6 RECOMMENDATIONS 6
7 LIMITATIONS 6
8 REFERENCES 8
TABLES
1 – Soil Vapor Analytical Results - VOCs
2 – Soil Vapor Analytical Results - Fixed Gases

FIGURES
1 – Site Location
2 – Site Plan
3 – Historical Select Soil Vapor Data
4 – Select Soil Vapor Data

APPENDICES
A – Soil Vapor Sampling Sheets
B – Laboratory Analytical Report
Ninyo & Moore | 33 Arroyo Drive, South San Francisco, California | 403151011 | April 23, 2025 1 1 INTRODUCTION
Ninyo & Moore has prepared this Soil Vapor Monitoring Report for the City of South San Francisco (City), relating to the property located at 33 Arroyo Drive, California (Site, Figure 1). In accordance with our recommendations from the May 17, 2024 Soil Vapor Monitoring Report – Second Quarter 2024, Ninyo & Moore conducted additional soil vapor sampling using standard soil vapor sampling procedures from the California Department of Toxic Substance Control (DTSC) guidance document Advisory Active Soil Gas Investigations (DTSC, 2015) to assess seasonal and temporal variability to confirm consistency in the results. The activities summarized in this report were performed in accordance with Ninyo & Moore's September 23, 2024 Proposal for Additional Soil Vapor Sampling and Reporting.
2 BACKGROUND

2.1 Site Description
The Site is located at 33 Arroyo Drive in South San Francisco, San Mateo County, California (Figure 1). It is situated on one parcel totaling approximately 1.87 acres of land designated by San Mateo County Assessor's Parcel Number 010400270. The Site is developed with the City of South San Francisco's (SSF) Municipal Services Building, which is occupied by the SSF Fire Department Station 63 (Figure 2). The exterior of the building consists of an asphalt parking area on the northeastern end of the building, parking areas on the northwestern exterior of the building, and access to the parking garage and fire department area on the southwestern end of the building.

2.2 Site Geology
In general, the soils observed beneath the Site during the Phase II Environmental Site Assessment (ESA) conducted on March 17, 2022 are primarily silty sand to approximately

5.5-feet below ground surface (bgs), which is the maximum depth explored. Two of the borings were also observed to contain a 1-ft interval of clayey sand and/or sandy silt at 4 feet bgs.

2.3 Previous Work
According to a Phase I ESA conducted by Ninyo & Moore, the Site has most recently been occupied by the South San Francisco Municipal Services Building and Social Hall (Ninyo & Moore, 2021). Available records indicated that a 2,500-gallon diesel underground storage tank (UST) was removed in 1998 from the exterior lot on the south end of the building, and there is an existing 2,000-gallon diesel above ground storage tank (AST) on the south end of the building Ninyo & Moore | 33 Arroyo Drive, South San Francisco, California | 403151011 | April 23, 2025 2 (Ninyo & Moore, 2021). The Site is also adjacent to the former My Cleaners dry cleaning facility located at 1053 El Camino Real, South San Francisco. The former My Cleaners is considered a recognized environmental condition (REC) due to the reported release of dry-cleaning compounds into the subsurface. Based on the findings of the Phase I ESA, Ninyo & Moore recommended conducting a sub-slab soil vapor assessment inside the building as well as beneath the parking garage to assess potential vapor migration issues associated with the former southeast-adjoining My Cleaners facility.

Ninyo and Moore conducted a Phase II ESA in 2022 (Ninyo & Moore, 2022), collecting soil samples from four soil borings, installing four soil vapor wells (SV-1 through SV-4) to 5-feet bgs and collecting soil vapor samples. Based on the soil analytical results and visual observations during the field sampling, shallow Site soils do not appear to be impacted with volatile organic compounds (VOCs). Results from the soil vapor wells indicated that the concentration of cis-1,2-dichloroethene (cis-1,2-DCE), trichloroethene (TCE) and vinyl chloride in soil vapor probe SV-2 were above their respective San Francisco Bay Regional Water Quality Control Board (RWQCB) Tier 1 and Residential Environmental Screening Levels (ESLs; Ninyo & Moore, 2022).

SV-2 is located directly north and adjacent to the former My Cleaners dry cleaning facility. Ninyo and Moore recommended additional soil vapor sampling to validate the exceedances.

On September 21, 2023, due to continued presence of water impacting vapor wells SV-2 and SV-3, Ninyo & Moore oversaw the destruction of these vapor wells, performed by VTS Drilling, LLC of Hayward, California, a C-57 licensed driller. Following the destruction of soil vapor wells SV-2 and SV-3, sub slab Vapor Pins® (SSV-2 and SSV-3) were installed approximately 1-ft away from the former soil vapor well locations, SV-2 and SV-3, respectively (Figure 2).

Additional soil vapor sampling was performed on September 29 and April 3, 2024 to evaluate potential contamination to shallow soil vapor and fill data gaps from the previous soil vapor sampling results at the Site. Results of the April 2024 soil vapor sampling, were:
• Benzene was reported at 9.3 micrograms per cubic meter (μg/m3) in vapor probe SV-4, which exceeds the 3.2 μg/m3 Residential ESL and is below the 14 μg/m3 Commercial ESL. The detection is also below State Water Resources Control Board (SWRCB) Low-Threat Underground Storage Tank Case Closure Policy (LTCP) criteria for residential use with no bioattenuation zone.
• Tetrachloroethene (PCE) was detected at 4.9 μg/m3 in SV-1, 7.9 μg/m3 in SSV-2, and 48 μg/m3 in SSV-3. The concentration detected in SSV-3 exceeds the Residential ESL of 15 μg/m3 but not the Commercial ESL of 67 μg/m3.

Select soil vapor data from previous sampling events are graphically presented on Figure 3.

Ninyo & Moore | 33 Arroyo Drive, South San Francisco, California | 403151011 | April 23, 2025 3 3 SOIL VAPOR SAMPLING ACTIVITIES
To evaluate potential seasonal and temporal variability to confirm consistency in the results, Ninyo & Moore conducted additional soil vapor sampling. On November 20, 2024, we collected soil vapor samples from the two soil vapor wells (SV-1 and SV-4) and two sub-slab soil vapor pins (SSV-2 and SSV-3) using laboratory-supplied sampling materials. Soil vapor sampling forms are presented in Appendix A.

3.1 Sampling Procedures
The soil vapor wells and pins were sampled according to standard soil vapor sampling procedures and the DTSC soil vapor investigation Advisory (DTSC, 2015), as described below. • Vapor Sampling Equipment and Manifold: A stainless-steel sample-train was constructed, with a 1-liter stainless-steel Summa® sample canister connected by a stainless-steel sample manifold. For each soil vapor sample, the sample train was connected to the soil vapor probe tubing. The manifolds, filters, gauges, flow controllers and Summa® canisters were supplied by a state-certified laboratory. A new manifold was used for each soil vapor sampling. The flow controller was pre-set by the laboratory to a 150-milliliters-per-minute (mL/min) flow-rate. • Shut-In Test: After connecting the Summa® canister and sample manifolds to the Teflon tubing, the Swagelok® ball valve was closed during shut-in test. Using a syringe to create a vacuum and then closed to start the shut-in test. At the onset of the shut-in test the initial vacuum and time was recorded on field notes. The shut-in test continued for approximately 2 to 5 minutes. If the vacuum pressure remained constant for the duration of the shut-in test, the test was considered successful (leak free). If the vacuum pressure changed, the shut-in test was discontinued, the manifold fittings were double checked and tightened, and the shut-in test was repeated until the vacuum pressure remained constant. • Leak Detection: Leaks in the sampling system could cause the dilution of analytical samples with ambient air. The leak-detection compound helium was used to evaluate whether leaks are present in the sampling equipment. With the exception of the tubing connections and sampling port, all of the manifold connections were successfully leak tested prior to sampling; therefore, only the tubing connections and sampling port could be possible sources of leakage. A shroud enclosed the sample train and helium gas was pumped into the shroud for the duration of sample collection in order to test for sample-train leaks and the well-head integrity. The helium was maintained at a concentration of at least 20 percent (%) within the shroud. The shroud helium-concentrations were documented on field datasheets allowing for calculation of the magnitude of atmospheric leakage if needed. The RWQCB and the DTSC allow for a maximum 5% leakage of ambient air into a sample container before the results are considered to be compromised. For example, with 20% helium maintained within the shroud, any helium detection over 1% in the sample indicates the sample may be compromised.
• Purge Volume – Vapor Probes: Following the shut-in test, the tubing and filter-pack void space volume were purged of three volumes of vapor.
• Purging: Prior to sample collection, purging of the air within the manifold and tubing was performed in order to collect samples representative of the subsurface soil vapor conditions.

Purging was conducted using either a Gillian Gilair pump or a syringe at a consistent flow Ninyo & Moore | 33 Arroyo Drive, South San Francisco, California | 403151011 | April 23, 2025 4 rate of 150 mL/min. Purge volume was monitored either by counting the number of syringe pulls or by reading the volume purged on the electric pump. • Sample Collection: Subsequent to purging, the purge valve was closed and the sample canister valve opened to begin sample collection. The sampling was monitored by change in pressure. The sampling start time, initial sample canister vacuum, end time, and final vacuum were recorded on soil vapor sampling data sheets. Sample canister valves were closed when the remaining vacuum was approximately -5 in. Hg and prior to reaching 0 in. Hg, which would indicate that no vacuum remained in the canister. • Sample Handling: Upon collection, each sample was labeled with the sample identification, date and time of collection, and analytical method requested. This information was also recorded on a chain of custody supplied by the laboratory. Samples were delivered to a state-certified analytical laboratory the day after sample collection. • Sample Identification: Soil vapor probe samples were identified with letters SV (to denote soil vapor probe), and SSV (to denote sub-slab soil vapor probe) followed by a unique number for each probe.

3.2 Laboratory Analyses
Soil vapor samples were submitted to McCampbell Analytical, Inc. (MAI), a California-certified analytical laboratory. The laboratory analytical report is presented in Appendix B. The soil vapor samples were analyzed for VOCs using United States Environmental Protection Agency (US EPA) Method TO-15 and for fixed gas oxygen and tracer gas helium ASTM Method D 1946. 4 SOIL VAPOR SAMPLING RESULTS
Soil vapor analytical results are presented in Tables 1 and 2. Soil vapor results were compared to RWQCB Residential and Commercial ESLs for Subslab/Soil Vapor, and gasoline constituent results were also compared to the SWRCB LTCP criteria. Current select soil vapor data exceeding ESLs are graphically shown on Figure 4. The laboratory analytical report is provided in Appendix B, and a discussion of the analytical results is presented below.

4.1 Volatile Organic Compounds
During the November 20, 2024 soil vapor sampling event, twelve VOCs were detected above laboratory reporting limits (RLs). A detailed list of VOC detections is below:
• Bromomethane, carbon disulfide, cyclohexane, dichlorodifluoromethane, ethylbenzene, styrene, toluene, TCE, 1,2,4-trimethylbenzene, and total xylenes were detected at concentrations below their respective residential ESLs, if established. • Benzene was detected at 7.8 µg/m3 in the SV-4 sample, which exceeds the 3.2 µg/m3 Residential ESL and is below the 14 µg/m3 Commercial ESL. The detection is also below SWRCB LTCP criteria for residential or commercial use with no bioattenuation zone.

Benzene was not detected in any other soil vapor samples collected in November 2024.

Ninyo & Moore | 33 Arroyo Drive, South San Francisco, California | 403151011 | April 23, 2025 5 • PCE was detected at 7.7, 89, 190 and 5.1 µg/m3 in SV-1, SSV-2, SSV-3 and SV-4, respectively. The concentrations detected in SSV-2 and SSV-3 exceed both the Residential ESL of 15 µg/m3 and the Commercial ESL of 67 µg/m3
.

4.2 Leak Detection Agent
No helium was detected at or above the laboratory report limit in any soil vapor samples collected this event.

All soil vapor analytical results are considered valid.

4.3 Fixed Gases
Oxygen as a fixed gas was reported at 35% for all soil vapor samples collected this event. These concentrations exceed atmospheric oxygen levels and are considered anomalous. 5 CONCLUSIONS
Ninyo & Moore conducted additional soil vapor sampling on November 20, 2024 to evaluate potential contamination to shallow soil vapor and soil vapor concentration seasonal variability at the Site. Based on the results of the November 2024 soil vapor sampling, Ninyo & Moore presents the following conclusions:
• Benzene was detected in only one sample (soil vapor well SV-4), at a concentration that exceeded the Residential ESL, but is below the Commercial ESL. Current concentrations are consistent with concentrations detected in April 2024.

As noted in the Phase II ESA, the benzene exceedances may be related to a petroleum fuel release from the former UST located on the south side of the Site. Therefore, the benzene concentrations were also compared to the SWRCB LTCP. The detections are below the residential LTCP criteria. Based on these comparisons to the LTCP criteria, the benzene concentrations detected in Site soil vapor are unlikely to present a significant vapor intrusion risk to the current or future Site building occupants.
• PCE concentrations exceeded both the Residential and Commercial ESLs in SSV-2 and SSV-3, and have increased compared to concentrations from April 2024. Concentrations in SSV-2 appear to be fluctuating, and concentrations from SSV-3, are increasing.

The source of the PCE concentrations is likely the adjacent My Cleaners, which is an open case listed on the SWRCB GeoTracker database (Case No. 559210). • As noted above, the fixed gas oxygen concentrations are anomalous. It is possible that remedial activities at the adjacent My Cleaners site may be affecting sub-slab and soil vapor conditions.

Ninyo & Moore | 33 Arroyo Drive, South San Francisco, California | 403151011 | April 23, 2025 6 6 RECOMMENDATIONS
Ninyo & Moore recommends submitting this data to the San Mateo County Groundwater Protection Program (GPP) to assist in their evaluation of the adjacent My Cleaners open case under their oversight, especially as that site is undergoing remediation. If the City decides to redevelop the Site, we recommend meeting with the GPP to discuss the redevelopment plans and environmental data to develop a strategy to complete the redevelopment while protecting human health and the environment. Ninyo & Moore also recommends conducting additional soil vapor monitoring in April or May 2025 to continue to monitor VOC and oxygen concentrations; in particular at SSV-2 and SSV-3 to further assess PCE trends. 7 LIMITATIONS
The environmental services described in this report have been conducted in general accordance with current regulatory guidelines and the standard-of-care exercised by environmental consultants performing similar work in the project area. No warranty, expressed or implied, is made regarding the professional opinions presented in this report. Variations in Site conditions may exist and conditions not observed or described in this report may be encountered during subsequent activities. Please also note that this study did not include an evaluation of geotechnical conditions or potential geologic hazards.

Ninyo & Moore’s opinions and recommendations regarding environmental conditions, as presented in this report, are based on limited subsurface assessment and chemical analysis.

Further assessment of potential adverse environmental impacts from past on-Site and/or nearby use of hazardous materials may be accomplished by a more comprehensive assessment. The samples collected and used for testing, and the observations made, are believed to be representative of the area(s) evaluated; however, conditions can vary significantly between sampling locations. Variations in soil and/or groundwater conditions will exist beyond the points explored in this evaluation.

The environmental interpretations and opinions contained in this report are based on the results of laboratory tests and analyses intended to detect the presence and concentration of specific chemical or physical constituents in samples collected from the Site. The testing and analyses have been conducted by an independent laboratory that is certified by the State of California to conduct such tests. Ninyo & Moore has no involvement in, or control over, such testing and analysis. Ninyo & Moore, therefore, disclaims responsibility for any inaccuracy in such laboratory results.

Ninyo & Moore | 33 Arroyo Drive, South San Francisco, California | 403151011 | April 23, 2025 7 Our conclusions, recommendations, and opinions are based on an analysis of the observed Site conditions. It should be understood that the conditions of a Site could change with time as a result of natural processes or the activities of man at the Site or nearby Sites. In addition, changes to the applicable laws, regulations, codes, and standards of practice may occur due to government action or the broadening of knowledge. The findings of this report may, therefore, be invalidated over time, in part or in whole, by changes over which Ninyo & Moore has no control.

This document is intended to be used only in its entirety. No portion of the document, by itself, is designed to completely represent any aspect of the project described herein. Ninyo & Moore should be contacted if the reader requires any additional information, or has questions regarding content, interpretations presented, or completeness of this document.

This report is intended exclusively for use by the client. Any use or reuse of the findings, conclusions, and/or recommendations of this report by parties other than the client is undertaken at said parties’ sole risk.

Ninyo & Moore | 33 Arroyo Drive, South San Francisco, California | 403151011 | April 23, 2025 8 8 REFERENCES
Cal EPA / RWQCB / DTSC, 2015. Advisory, Active Soil Gas Investigations; California Environmental Protection Agency / Regional Water Quality Control Board/ California Department of Toxic Substance Control; dated July.

California State Water Resources Control Board (SWRCB), 2012. Low-Threat Underground Storage Tank Case Closure Policy. Effective August 17, 2012.

Ninyo & Moore, 2018. Phase II Environmental Site Assessment and Geophysical Survey Report, 1 Chestnut Avenue, 1010 El Camino Real, 33 Arroyo Drive and 81 Arroyo Drive Properties, South San Francisco, California. Dated January 15.

Ninyo & Moore, 2021. Phase I Environmental Site Assessment, Municipal Services Building, South San Francisco, California. Dated April 20.

Ninyo & Moore, 2022. Phase II Environmental Site Assessment, 33 Arroyo Drive, South San Francisco, California. Dated November 19.

San Francisco Bay Area Regional Water Quality Control Board (RWQCB), 2019. Environmental Screening Levels, San Francisco Bay Regional Water Quality Control Board. Dated February.

Ninyo & Moore | 33 Arroyo Drive, South San Francisco, California | 403151011 | April 23, 2025 TABLES
Table 1 – Soil Vapor Analytical Results - VOCs
Depth
(feet bgs) Acetone Acrylonitrile Benzene Bromomethane 2-Butanone (MEK) Carbon Disulfide Chloroform Chloromethane Cyclohexane 1,1-Dichloroethene cis-1,2-Dichloroethene trans-1,2-Dichloroethene Dichlorodifluoromethane Ethanol Ethylbenzene 4-Ethyltoluene Heptane Hexane Methylene Chloride 4-Methyl-2-pentanone (MIBK) Styrene Tetrachloroethene (PCE) Toluene Trichloroethene (TCE) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene Vinyl Chloride Xylenes, Total Others VOCs SV-1 3/21/2022 5.0 ND<60 ND<1.1 4.3 6.8 ND<15 6.4 3.4 3.1 ND<18 ND<2.0 ND<2.0 ND<2.0 ND<2.5 ND<95 19 4.2 ND<21 ND<18 ND<8.8 2.8 ND<2.2 5.4 44 ND<2.8 17 8.3 ND<0.26 74 ND SV-1 7/19/2022 5.0 ND<60 ND<1.1 ND<1.6 60 ND<15 ND<1.6 ND<2.5 7.5 ND<18 ND<2.0 ND<2.0 ND<2.0 ND<2.5 ND<95 ND<2.2 ND<2.5 ND<21 ND<18 ND<8.8 ND<2.1 ND<2.2 7.4 B ND<1.9 ND<2.8 ND<2.5 ND<2.5 ND<0.26 ND<2.2 ND SV-1 5/17/2023 5.0 ND<60 ND<1.1 ND<1.6 120 ND<15 ND<1.6 ND<2.5 ND<1.0 ND<18 ND<2.0 ND<2.0 ND<2.0 ND<2.5 ND<95 ND<2.2 ND<2.5 ND<21 ND<18 ND<8.8 ND<2.1 ND<2.2 ND<3.5 ND<1.9 ND<2.8 ND<2.5 ND<2.5 ND<0.26 ND<2.2 ND SV-1 9/29/2023 5.0 ND<60 ND<1.1 ND<1.6 33 ND<15 ND<1.6 ND<2.5 1.7 ND<18 ND<2.0 ND<2.0 ND<2.0 ND<2.5 ND<95 ND<2.2 ND<2.5 ND<21 ND<18 ND<8.8 ND<2.1 ND<2.2 6.5 ND<1.9 ND<2.8 ND<2.5 ND<2.5 ND<0.26 ND<2.2 ND SV-1 4/3/2024 5.0 ND<61 ND<1.1 ND<1.6 11 ND<15 ND<1.6 ND<2.5 ND<1.0 ND<18 ND<2.0 ND<2.0 ND<2.0 ND<2.5 ND<96 ND<2.2 ND<2.5 ND<21 ND<18 ND<8.9 ND<2.1 ND<2.2 4.9 ND<1.9 ND<2.8 ND<2.5 ND<2.5 ND<0.26 ND<2.2 ND SV-1 11/20/2024 5.0 ND<60 ND<1.1 ND<1.6 2.7 ND<15 ND<1.6 ND<2.5 ND<1.0 ND<18 ND<2.0 ND<2.0 ND<2.0 ND<2.5 ND<95 ND<2.2 ND<2.5 ND<21 ND<18 ND<8.8 ND<2.1 ND<2.2 7.7 ND<1.9 ND<2.8 ND<2.5 ND<2.5 ND<0.26 <4.4 ND SV-2 3/21/2022 5.0 130 ND<1.1 25 ND<1.9 35 12 ND<2.5 ND<1.0 28 6.7 510 140 ND<2.5 ND<95 16 6.1 27 28 ND<8.8 8.7 ND<2.2 ND<3.5 35 17 22 9.8 74 70 ND SV-2 7/19/2022 5.0 Not sampled due to high back pressure during purging ND SV-2 5/17/2023 5.0 Not sampled due to high back pressure during purging ND SSV-2 9/29/2023 sub-slab ND<60 ND<1.1 ND<1.6 ND<1.9 ND<15 ND<1.6 ND<2.5 ND<1.0 ND<18 ND<2.0 ND<2.0 ND<2.0 ND<2.5 180 ND<2.2 ND<2.5 ND<21 ND<18 ND<8.8 ND<2.1 ND<2.2 72 10 12 ND<2.5 ND<2.5 ND<0.26 7 ND SSV-2 4/3/2024 sub-slab ND<61 ND<1.1 ND<1.6 ND<1.9 ND<15 ND<1.6 ND<2.6 ND<1.0 ND<18 ND<2.0 ND<2.0 ND<2.0 ND<2.6 160 ND<2.2 ND<2.6 ND<21 ND<18 15 ND<2.1 ND<2.2 7.9 ND<1.9 ND<2.9 ND<2.6 ND<2.6 ND<0.27 ND<2.2 ND SSV-2 11/20/2024 sub-slab ND<60 ND<1.1 ND<1.6 ND<1.9 ND<15 ND<1.6 ND<2.5 ND<1.0 ND<18 ND<2.0 ND<2.0 ND<2.0 2.5 ND<95 ND<2.2 ND<2.5 ND<21 ND<18 ND<8.8 ND<2.1 2.4 89 ND<1.9 13 ND<2.5 ND<2.5 ND<0.26 7.3 ND SV-3 3/21/2022 5.0 Not sampled due to high back pressure during purging ND SV-3 7/19/2022 5.0 Not sampled due to high back pressure during purging ND SV-3 5/17/2023 5.0 Not sampled due to high back pressure during purging ND SSV-3 9/29/2023 sub-slab ND<60 ND<1.1 ND<1.6 ND<1.9 ND<15 ND<1.6 ND<2.5 ND<1.0 ND<18 ND<2.0 ND<2.0 ND<2.0 ND<2.5 ND<95 ND<2.2 ND<2.5 ND<21 ND<18 ND<8.8 ND<2.1 ND<2.2 34 3.7 6.7 ND<2.5 ND<2.5 ND<0.26 ND<2.2 ND SSV-3 4/3/2024 sub-slab ND<62 ND<1.1 ND<1.7 ND<2.0 ND<16 ND<1.7 ND<2.6 ND<1.0 ND<19 ND<2.1 2.4 ND<2.1 ND<2.6 150 ND<2.3 ND<2.6 ND<22 ND<19 ND<9.1 ND<2.2 ND<2.3 48 ND<2.0 9.2 ND<2.6 ND<2.6 ND<0.27 ND<2.3 ND SSV-3 11/20/2024 sub-slab ND<61 ND<1.1 ND<1.6 ND<1.9 ND<15 ND<1.6 ND<2.5 ND<1.0 ND<18 ND<2.0 ND<2.0 ND<2.0 2.6 ND<96 ND<2.2 ND<2.5 ND<21 ND<18 ND<8.9 ND<2.1 ND<2.2 190 ND<1.9 13 ND<2.5 ND<2.5 ND<0.26 ND<4.5 ND SV-4 3/21/2022 5.0 77 6.8 15 2.3 16 18 ND<2.5 ND<1.0 ND<18 ND<2.0 ND<2.0 ND<2.0 ND<2.5 ND<95 19 5 66 41 ND<8.8 ND<2.1 ND<2.2 ND<3.5 46 ND<2.8 16 8.2 ND<0.26 70 ND SV-4 7/19/2022 5.0 ND<60 ND<1.1 11 ND<1.9 ND<15 3.5 ND<2.5 ND<1.0 66 ND<2.0 ND<2.0 ND<2.0 ND<2.5 ND<96 13 ND<2.5 ND<21 29 ND<8.9 ND<2.1 ND<2.2 7.7 B 25 ND<2.8 14 7.9 ND<0.26 55 ND SV-4 5/17/2023 5.0 ND<60 ND<1.1 7.7 86 ND<15 ND<1.6 ND<2.5 ND<1.0 ND<18 ND<2.0 ND<2.0 ND<2.0 ND<2.5 ND<95 7.2 ND<2.5 ND<21 ND<18 ND<8.8 ND<2.1 ND<2.2 ND<3.5 5.5 ND<2.8 5.4 ND<2.5 ND<0.26 23 ND SV-4 9/29/2023 5.0 ND<60 ND<1.1 11 17 ND<15 ND<1.6 ND<2.5 ND<1.0 ND<18 ND<2.0 ND<2.0 ND<2.0 ND<2.5 ND<95 12 2.9 ND<21 ND<18 ND<8.8 ND<2.1 ND<2.2 ND<3.5 7.7 ND<2.8 10 ND<2.5 ND<0.26 44 ND SV-4 4/3/2024 5.0 ND<61 ND<1.1 9.3 25 ND<15 ND<1.6 ND<2.5 ND<1.0 ND<18 ND<2.0 ND<2.0 ND<2.0 ND<2.5 ND<97 6 ND<2.5 ND<21 ND<18 ND<8.9 ND<2.1 ND<2.2 ND<3.6 3.4 ND<2.8 8.4 ND<2.5 ND<0.26 24 ND SV-4 11/20/2024 5.0 ND<60 ND<1.1 7.8 4.0 ND<15 1.8 ND<2.5 ND<1.0 46 ND<2.0 ND<2.0 ND<2.0 ND<2.5 ND<95 5.6 ND<2.5 ND<21 ND<18 ND<8.8 ND<2.1 ND<2.2 5.1 3.1 ND<2.8 11 ND<2.5 ND<0.26 23 ND Screening Criteria
1,100,000 NE 3.2 170 170,000 NE 4.1 3,100 NE 2,400 280 2,800 NE NE 37 NE NE NE 34 100,000 31,000 15 10,000 16 NE NE 0.32 3,500 Various 4,500,000 NE 14 730 730,000 NE 18 13,000 NE 10,000 1,200 12,000 NE NE 160 NE NE NE 410 440,000 130,000 67 44,000 100 NE NE 5.2 15,000 Various NE NE 85/280 NE NE NE NE NE NE NE NE NE NE NE 1,100/3,600 NE NE NE NE NE NE NE NE NE NE NE NE NE NE Notes:

VOCs - volatile organic compous analyzed using United States Environmental Protection Agency Method TO-15 ID - identification
bgs - below ground surface
µg/m3 - micrograms per cubic meter
ND<X - not detected at or above the laboratory reporting limit X B - analyte detected in the associated Method Blank at a concentration greater than 1/10 the reported sample result --- not analyzed
ESL - San Francisco Bay Regional Water Control Board (RWQCB) environmental screening level LTCP - State Water Resources Control Board (SWRCB) Low-Threat Underground Storage Tank Case Closure Policy NE - screening level not established
1 = RWQCB Subslab/Soil Gas ESL, Vapor Intrusion: Human Health Risk Levels (Table SG-1), Residential, Cancer risk /non-cancer hazard, 2019 (Rev.2). Most conservative value shown. 2 = RWQCB Subslab/Soil Gas ESL, Vapor Intrusion: Human Health Risk Levels (Table SG-1), Commercial, Cancer risk /non-cancer hazard, 2019 (Rev.2). Most conservative value shown. 3 = SWRCB LTCP, 2012. Petroleum Vapor Intrusion to Indoor Air, Scenario 4 with no bioattenuation zone, residential/commercial Results in Bold equal or exceed ESLs
μg/m³
LTCP Residential/Commercial3
Sample
Date
Sample
ID
Residental ESL1
Commercial ESL2
Ninyo & Moore | 33 Arroyo Drive, South San Francisco, California | 403151011 | April 23, 2025 1 Table 2 – Soil Vapor Analytical Results - Fixed Gases
SV-1 3/21/2022 5.0 ND<0.050 6.4
SV-1 7/19/2022 5.0 ND<0.050 5.0
SV-1 5/17/2023 5.0 ND<0.050 3.4
SV-1 9/29/2023 5.0 ND<0.050 6.6
SV-1 4/3/2024 5.0 ND<0.050 4.1
SV-1 11/20/2024 5.0 ND<0.050 35
SV-2 3/21/2022 5.0 ND<0.050 1.1
SV-2 7/19/2022 5.0 Not sampled due to high back pressure during purging SV-2 5/17/2023 5.0 Not sampled due to high back pressure during purging SSV-2 9/29/2023 sub-slab ND<0.050 19
SSV-2 4/3/2024 sub-slab 0.13 28
SSV-2 11/20/2024 sub-slab ND<0.050 35
SV-3 3/21/2022 5.0 Not sampled due to high back pressure during purging SV-3 7/19/2022 5.0 Not sampled due to high back pressure during purging SV-3 5/17/2023 5.0 Not sampled due to high back pressure during purging SSV-3 9/29/2023 sub-slab ND<0.050 0.58
SSV-3 4/3/2024 sub-slab ND<0.052 15
SSV-3 11/20/2024 sub-slab ND<0.051 35
SV-4 3/21/2022 5.0 ND<0.050 0.98
SV-4 7/19/2022 5.0 ND<0.050 0.77
SV-4 5/17/2023 5.0 ND<0.050 0.44
SV-4 9/29/2023 5.0 ND<0.050 19
SV-4 4/3/2024 5.0 ND<0.051 0.9
SV-4 11/20/2024 5.0 ND<0.050 35
Notes:

Fixed gases analyzed using ASTM D 1946
ID - identification
bgs - below grou surface
% - percent
ND<X - not detected at or above the laboratory reporting limit X Helium Oxygen
Sample ID Sample Date Depth
(feet bgs)
%
Ninyo & Moore | 33 Arroyo Drive, South San Francisco, California | 403151011 | April 23, 2025 1 Ninyo & Moore | 33 Arroyo Drive, South San Francisco, California | 403151011 | April 23, 2025 Appendix A
Photographic Documentation

FIGURES
SITE
Geotechnical & Environmental Sciences Consultants

SITE LOCATION
0 SCALE (FEET)
2,000 4,000
N 403151011.dwg 01/15/2025 AEK
FIGURE 1
NOTE: DIMENSIONS, DIRECTIONS, AND LOCATIONS ARE APPROXIMATE I REFERENCE: USGS, 2018 SOIL VAPOR SAMPLING REPORT - FOURTH QUARTER 2024
33 ARROYO DRIVE

SOUTH SAN FRANCISCO, CALIFORNIA
403151011 I 04/25

EL CAMINO REAL

ARROYO DR

CAMARITAS AVE

ALTA LOMA DR
2,000-GALLON

DIESEL AST &

DISPENSER

FORMER MY

CLEANERS

DEL PASO DR
SB/SV-1
SB/SV-2
SB/SV-3 SB/SV-4
SSV-2
SSV-3

FORMER FIRING
RANGE
(LOWER LEVEL)
Geotechnical & Environmental Sciences Consultants

SITE PLAN
0 SCALE (FEET)
80 160
N 403151011.dwg 01/15/2025 AEK
FIGURE 2
LEGEND

SITE BOUNDARY

SOIL BORING AND

SOIL VAPOR WELL
SB/SV-1

SOIL BORING AND FORMER

SOIL VAPOR WELL
(DESTROYED SEPTEMBER 2023)
SB/SV-2
SSV-2 SUB-SLAB SOIL VAPOR PIN
SOIL VAPOR SAMPLING REPORT - FOURTH QUARTER 2024
33 ARROYO DRIVE

SOUTH SAN FRANCISCO, CALIFORNIA
403151011 I 04/25
NOTE:

SOIL VAPOR PIN SSV-1 (REPLACEMENT FOR SV-1)
NOT INSTALLED; NOT CURRENTLY NEEDED
NOTE: DIMENSIONS, DIRECTIONS, AND LOCATIONS ARE APPROXIMATE REFERENCES: GOODWIN B. STEINBERG ASSOCIATES, 1979; GOOGLE EARTH, 2023

EL CAMINO REAL

ARROYO DR

CAMARITAS AVE

ALTA LOMA DR
2,000-GALLON

DIESEL AST &

DISPENSER

FORMER MY

CLEANERS

DEL PASO DR
SB/SV-1
SB/SV-2
SB/SV-3 SB/SV-4
SSV-2
SSV-3

FORMER FIRING
RANGE
(LOWER LEVEL)
Geotechnical & Environmental Sciences Consultants

HISTORICAL SELECT SOIL VAPOR DATA
0 SCALE (FEET)
80 160
N 403151011.dwg 01/15/2025 AEK
FIGURE 3
LEGEND

SITE BOUNDARY

SOIL BORING AND

SOIL VAPOR WELL
SB/SV-1

SOIL BORING AND FORMER

SOIL VAPOR WELL
(DESTROYED SEPTEMBER 2023)
SB/SV-2
SSV-2 SUB-SLAB SOIL VAPOR PIN
SOIL VAPOR SAMPLING REPORT - FOURTH QUARTER 2024
33 ARROYO DRIVE

SOUTH SAN FRANCISCO, CALIFORNIA
403151011 I 04/25
NOTE: DIMENSIONS, DIRECTIONS, AND LOCATIONS ARE APPROXIMATE REFERENCES: GOODWIN B. STEINBERG ASSOCIATES, 1979; GOOGLE EARTH, 2023 NOTES:

SS = SUB-SLAB
BENZ = BENZENE
CIS = cis-1,2-DICHLOROETHENE
PCE = TETRACHLOROETHENE
TCE = TRICHLOROETHENE
VC = VINYL CHLORIDE
NS = NOT SAMPLED; HIGH BACK

PRESSURE DURING PURGING
<X = NOT DETECTED AT OR ABOVE

LABORATORY REPORTING LIMIT
B = ANALYTE DETECTED IN

METHOD BLANK
R = RESIDENTIAL ESL
C = COMMERCIAL ESL

RESULTS IN BOLD EQUAL

OR EXCEED ESL

SAMPLE ID,

DATE, DEPTH,

AND RESULTS,

IN MICROGRAMS

PER CUBIC
METER
SV-1
DATE 03/21/22 07/19/22 05/17/23 09/29/23 04/03/24 11/20/24 FT 5.0 5.0 5.0 5.0 5.0 5.0
BENZ 4.3 <1.6 <1.6 <1.6 <1.6 <1.6
cis <2.0 <2.0 <2.0 <2.0 <2.0 <2.0
PCE 5.4 7.4 B <3.5 6.5 4.9 7.7
TCE <2.8 <2.8 <2.8 <2.8 <2.8 <2.8
VC <0.26 <0.26 <0.26 <0.26 <0.26 <0.26
SSV-3
DATE 09/29/23 04/03/24 11/20/24

FT SS SS SS
BENZ <1.6 <1.7 <1.6
cis <2.0 2.4 <2.0
PCE 34 48 190
TCE 6.7 9.2 13
VC <0.26 <0.27 <0.26
SV-2
DATE 03/21/22 07/19/22 05/17/23
FT 5.0 5.0 5.0
BENZ 25
NS NS
cis 510
PCE <3.5
TCE 17
VC 74
SV-4
DATE 03/21/22 07/19/22 05/17/23 09/29/23 04/03/24 11/20/24 FT 5.0 5.0 5.0 5.0 5.0 5.0
BENZ 15 11 7.7 11 9.3 9.3
cis <2.0 <2.0 <2.0 <2.0 <2.0 <2.0
PCE <3.5 7.7 B <3.5 <3.5 <3.6 <3.6
TCE <2.8 <2.8 <2.8 <2.8 <2.8 <2.8
VC <0.26 <0.26 <0.26 <0.26 <0.26 <0.26
SSV-2
DATE 09/29/23 04/03/24 11/20/24

FT SS SS SS
BENZ <1.6 <1.6 <1.6
cis <2.0 <2.0 <2.0
PCE 72 7.9 89
TCE 12 <2.9 13
VC <0.26 <0.27 <0.26
SV-3
DATE 03/21/22 07/19/22 05/17/23
FT 5.0 5.0 5.0
BENZ

NS NS NS
cis
PCE
TCE
VC
SV-1
DATE 04/03/24
FT 5.0 R C
BENZ <1.6 3.2 14
cis <2.0 280 1,200
PCE 4.9 15 67
TCE <2.8 16 100
VC <0.26 0.32 5.2

EL CAMINO REAL

ARROYO DR

CAMARITAS AVE

ALTA LOMA DR
2,000-GALLON

DIESEL AST &

DISPENSER

FORMER MY

CLEANERS

DEL PASO DR
SB/SV-1
SB/SV-2
SB/SV-3 SB/SV-4
SSV-2
SSV-3

FORMER FIRING
RANGE
(LOWER LEVEL)
Geotechnical & Environmental Sciences Consultants

SELECT SOIL VAPOR DATA
0 SCALE (FEET)
80 160
N 403151011.dwg 01/15/2025 AEK
FIGURE 4
SOIL VAPOR SAMPLING REPORT - FOURTH QUARTER 2024
33 ARROYO DRIVE

SOUTH SAN FRANCISCO, CALIFORNIA
403151011 I 04/25
NOTE: DIMENSIONS, DIRECTIONS, AND LOCATIONS ARE APPROXIMATE REFERENCES: GOODWIN B. STEINBERG ASSOCIATES, 1979; GOOGLE EARTH, 2023 SV-1
DATE 11/20/24
FT 5.0
BENZ <1.6
cis <2.0
PCE 7.7
TCE <2.8
VC <0.26
SSV-3
DATE 11/20/24
FT SS
BENZ <1.6
cis <2.0
PCE 190
TCE 13
VC <0.26
SSV-2
DATE 11/20/24
FT SS
BENZ <1.6
cis <2.0
PCE 89
TCE 13
VC <0.26
SV-4
DATE 11/20/24
FT 5.0
BENZ 9.3
cis <2.0
PCE <3.6
TCE <2.8
VC <0.26
LEGEND

SITE BOUNDARY

SOIL BORING AND

SOIL VAPOR WELL
SB/SV-1

SOIL BORING AND FORMER

SOIL VAPOR WELL
(DESTROYED SEPTEMBER 2023)
SB/SV-2
SSV-2 SUB-SLAB SOIL VAPOR PIN
NOTES:

SS = SUB-SLAB
BENZ = BENZENE
CIS = cis-1,2-DICHLOROETHENE
PCE = TETRACHLOROETHENE
TCE = TRICHLOROETHENE
VC = VINYL CHLORIDE
<X = NOT DETECTED AT OR ABOVE

LABORATORY REPORTING LIMIT
R = RESIDENTIAL ESL
C = COMMERCIAL ESL

RESULTS IN BOLD EQUAL OR

EXCEED ESL
SV-1
DATE 04/03/24
FT 5.0 R C
BENZ <1.6 3.2 14
cis <2.0 280 1,200
PCE 4.9 15 67
TCE <2.8 16 100
VC <0.26 0.32 5.2

SAMPLE ID,

DATE, DEPTH,

AND RESULTS,

IN MICROGRAMS

PER CUBIC
METER
Ninyo & Moore | 33 Arroyo Drive, South San Francisco, California | 403151011 | April 23, 2025

APPENDIX A
Soil Vapor Sampling Sheets

Ninyo & Moore | 33 Arroyo Drive, South San Francisco, California | 403151011 | April 23, 2025

APPENDIX B
Laboratory Analytical Report
WorkOrder:

Report Created for: Ninyo & Moore
1301 Marina Village Parkway, Suite 110
Alameda, CA 94501
Project Contact: Gregory Roberts
Project: 403151011; City of SSF-MSB
Project P.O.:

Project Received: 11/22/2024
Analytical Report reviewed & approved for release on 12/06/2024 by:

Jennifer Lagerbom
2411F09
McCampbell Analytical Inc. is not accredited for all the testing in this report. The report shall not be reproduced except in full, without the written approval of the laboratory. The analytical results relate only to the items tested.

Analytical Report
1534 Willow Pass Rd. Pittsburg, CA 94565 ♦ TEL: (877) 252-9262 ♦ FAX: (925) 252-9269 ♦ www.mccampbell.com Project Manager
Project Location: 33 Arroyo Drive South SF
McCampbell Analytical, Inc.
"When Quality Counts"

Page 1 of 33 ends

Glossary of Terms & Qualifier Definitions
Client: Ninyo & Moore
Project: 403151011; City of SSF-MSB
WorkOrder: 2411F09
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Glossary Abbreviation
%D Serial Dilution Percent Difference
95% Interval 95% Confident Interval
CCV Continuing Calibration Verification.

CCV REC (%) % recovery of Continuing Calibration Verification.

CPT Consumer Product Testing not NELAP Accredited
DF Dilution Factor
DI WET (DISTLC) Waste Extraction Test using DI water
DISS Dissolved (direct analysis of 0.45 µm filtered and acidified water sample) DLT Dilution Test (Serial Dilution)
DUP Duplicate
EDL Estimated Detection Limit
ERS External reference sample. Second source calibration verification.

ITEF International Toxicity Equivalence Factor
LCS Laboratory Control Sample
LCS2 Second LCS for the batch. Spike level is lower than that for the first LCS; applicable to method 1633.

LQL Lowest Quantitation Level
MB Method Blank
MB IS/SS % Rec % Recovery of Internal Standard or Surrogate in Method Blank, if applicable MB SS % Rec % Recovery of Surrogate in Method Blank, if applicable MDL Method Detection Limit ¹
ML Minimum Level of Quantitation
MS Matrix Spike
MSD Matrix Spike Duplicate
NA Not Applicable
ND Not detected at or above the indicated MDL or RL
NR Data Not Reported due to matrix interference or insufficient sample amount.

PDS Post Digestion Spike
PF Prep Factor
RD Relative Difference
RL Reporting Limit ²
RPD Relative Percent Difference
RRT Relative Retention Time
RSD Relative Standard Deviation
SNR Surrogate is diluted out of the calibration range
¹ MDL is the minimum measured concentration of a substance that can be reported with 99% confidence that the measured concentration is distinguishable from method blank results. Definition and Procedure for the Determination of the Method Detection Limit, Revision 2, 40CFR, Part 136, Appendix B, EPA 821-R-16-006, December 2016. Values are based upon our default extraction volume/amount and are subject to change.
² RL is the lowest level that can be reliably determined within specified limits of precision and accuracy during routine laboratory operating conditions. (The RL cannot be lower than the lowest calibration standard used in the initial calibration of the instrument and must be greater than the MDL.) Values are based upon our default extraction volume/amount and are subject to change.

Page 2 of 33 ends

Glossary of Terms & Qualifier Definitions
Client: Ninyo & Moore
Project: 403151011; City of SSF-MSB
WorkOrder: 2411F09
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" SPK Val Spike Value
SPKRef Val Spike Reference Value
SPLP Synthetic Precipitation Leachate Procedure
ST Sorbent Tube
TCLP Toxicity Characteristic Leachate Procedure
TEQ Toxicity Equivalents
TNTC “Too Numerous to Count;” greater than 250 colonies observed on the plate.

TZA TimeZone Net Adjustment for sample collected outside of MAI's Coordinated Universal Time (UTC). (Adjustment for Daylight Saving is not accounted.)
WET (STLC) Waste Extraction Test (Soluble Threshold Limit Concentration) Quality Control Qualifiers
F2 LCS/LCSD recovery and/or RPD/RSD is out of acceptance criteria.

F7 The LCS/LCSD recovery is above the upper control limit. The target analyte(s) were Not Detected (ND); therefore, the data is reportable.

Page 3 of 33 ends

Client: Ninyo & Moore
Project: 403151011; City of SSF-MSB
Case Narrative
December 06, 2024
Work Order: 2411F09
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" TO-15 ANALYSIS
McCampbell Analytical Inc. is currently not accredited for TO15 and ASTM D 1946m.

All summa canisters are EVACUATED 5 days after the reporting of the results. Please call or email if a longer retention time is required.

Page 4 of 33 ends

Summary of Sample Pressure Report
Lab ID Lab Prep
Vacuum
(psia)
Field Initial
Vacuum
(inHg)
Field Final
Vacuum
(inHg)
Lab
Received
Vacuum
(psia)
Lab
Received
Vacuum
(inHg)
Lab Final
Vacuum /
Pressure
(psia)
Canister ID
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" 2411F09-001A 1975-2602 0.22 -29 -5 13.01 -3.44 26.11
2411F09-002A 1992-2619 0.25 -29 -5 12.61 -4.26 25.3
2411F09-003A 2036-2660 0.24 -28 -5 12.16 -5.17 24.63
2411F09-004A 2011-2638 0.25 -30 -5 12.04 -5.42 24.14

Page 5 of 33 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: Ninyo & Moore
Project: 403151011; City of SSF-MSB
Date Received: 11/22/2024 14:16
Date Prepared: 11/26/2024
WorkOrder: 2411F09
Extraction Method: ASTM D 1946-90
Analytical Method: ASTM D 1946-90
Unit: %
Atmospheric Gases
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-1 2411F09-001A SoilGas 11/20/2024 07:53 GC51 2024-11-26 14-5 306790 Analytes Result RL DF Date Analyzed
NA NA
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
Oxygen 35 0.40 1 11/26/2024 14:59
SSV-2 2411F09-002A SoilGas 11/20/2024 08:32 GC51 2024-11-26 15-4 306790 Analytes Result RL DF Date Analyzed
NA NA
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
Oxygen 35 0.40 1 11/26/2024 15:43
SSV-3 2411F09-003A SoilGas 11/20/2024 09:26 GC51 2024-11-26 16-2 306790 Analytes Result RL DF Date Analyzed
NA NA
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
Oxygen 35 0.40 1 11/26/2024 16:27
(Cont.)

Page 6 of 33 ends

Page 7 of 33 ends

13.01 26.11
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
Helium ND 0.050 1 12/02/2024 17:58
SSV-2 2411F09-002A SoilGas 11/20/2024 08:32 GC26 1202240311.D 306976 Analytes Result RL DF Date Analyzed

12.61 25.30
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
Helium ND 0.050 1 12/02/2024 18:11
SSV-3 2411F09-003A SoilGas 11/20/2024 09:26 GC26 1202240312.D 306976 Analytes Result RL DF Date Analyzed

12.16 24.63
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
Helium ND 0.051 1 12/02/2024 18:24
(Cont.)

Page 8 of 33 ends

12.04 24.14
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
Helium ND 0.050 1 12/02/2024 18:36

Page 9 of 33 ends

13.01 26.11
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
Acetone ND 60 1 12/03/2024 03:01
Acrolein ND 5.8 1 12/03/2024 03:01
Acrylonitrile ND 1.1 1 12/03/2024 03:01
tert-Amyl methyl ether (TAME) ND 2.1 1 12/03/2024 03:01 Benzene ND 1.6 1 12/03/2024 03:01
Benzyl chloride ND 2.7 1 12/03/2024 03:01
Bromodichloromethane ND 1.4 1 12/03/2024 03:01
Bromoform ND 5.3 1 12/03/2024 03:01
Bromomethane 2.7 1.9 1 12/03/2024 03:01
1,3-Butadiene ND 1.1 1 12/03/2024 03:01
2-Butanone (MEK) ND 15 1 12/03/2024 03:01
t-Butyl alcohol (TBA) ND 16 1 12/03/2024 03:01
Carbon Disulfide ND 1.6 1 12/03/2024 03:01
Carbon Tetrachloride ND 1.3 1 12/03/2024 03:01
Chlorobenzene ND 2.4 1 12/03/2024 03:01
Chloroethane ND 1.3 1 12/03/2024 03:01
Chloroform ND 2.5 1 12/03/2024 03:01
Chloromethane ND 1.0 1 12/03/2024 03:01
Cyclohexane ND 18 1 12/03/2024 03:01
Dibromochloromethane ND 4.4 1 12/03/2024 03:01
1,2-Dibromo-3-chloropropane ND 0.12 1 12/03/2024 03:01
1,2-Dibromoethane (EDB) ND 0.078 1 12/03/2024 03:01
1,2-Dichlorobenzene ND 3.0 1 12/03/2024 03:01
1,3-Dichlorobenzene ND 3.0 1 12/03/2024 03:01
1,4-Dichlorobenzene ND 3.0 1 12/03/2024 03:01
Dichlorodifluoromethane ND 2.5 1 12/03/2024 03:01
1,1-Dichloroethane ND 2.0 1 12/03/2024 03:01
1,2-Dichloroethane (1,2-DCA) ND 2.0 1 12/03/2024 03:01
1,1-Dichloroethene ND 2.0 1 12/03/2024 03:01
cis-1,2-Dichloroethene ND 2.0 1 12/03/2024 03:01
trans-1,2-Dichloroethene ND 2.0 1 12/03/2024 03:01
1,2-Dichloropropane ND 2.4 1 12/03/2024 03:01
cis-1,3-Dichloropropene ND 2.3 1 12/03/2024 03:01
trans-1,3-Dichloropropene ND 2.3 1 12/03/2024 03:01
(Cont.)

Page 10 of 33 ends

13.01 26.11
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
1,2-Dichloro-1,1,2,2-tetrafluoroethane ND 3.6 1 12/03/2024 03:01 Diisopropyl ether (DIPE) ND 2.1 1 12/03/2024 03:01
1,4-Dioxane ND 1.9 1 12/03/2024 03:01
Ethanol ND 95 1 12/03/2024 03:01
Ethyl acetate ND 1.9 1 12/03/2024 03:01
Ethyl tert-butyl ether (ETBE) ND 2.1 1 12/03/2024 03:01 Ethylbenzene ND 2.2 1 12/03/2024 03:01
4-Ethyltoluene ND 2.5 1 12/03/2024 03:01
Freon 113 ND 3.9 1 12/03/2024 03:01
Heptane ND 21 1 12/03/2024 03:01
Hexachlorobutadiene ND 2.2 1 12/03/2024 03:01
Hexachloroethane ND 4.9 1 12/03/2024 03:01
Hexane ND 18 1 12/03/2024 03:01
2-Hexanone ND 2.1 1 12/03/2024 03:01
4-Methyl-2-pentanone (MIBK) ND 2.1 1 12/03/2024 03:01
Methyl-t-butyl ether (MTBE) ND 1.9 1 12/03/2024 03:01
Methylene chloride ND 8.8 1 12/03/2024 03:01
Methyl methacrylate ND 2.1 1 12/03/2024 03:01
Naphthalene ND 2.7 1 12/03/2024 03:01
Styrene ND 2.2 1 12/03/2024 03:01
1,1,1,2-Tetrachloroethane ND 3.5 1 12/03/2024 03:01
1,1,2,2-Tetrachloroethane ND 0.70 1 12/03/2024 03:01
Tetrachloroethene 7.7 3.5 1 12/03/2024 03:01
Tetrahydrofuran ND 3.0 1 12/03/2024 03:01
Toluene ND 1.9 1 12/03/2024 03:01
1,2,4-Trichlorobenzene ND 3.8 1 12/03/2024 03:01
1,1,1-Trichloroethane ND 2.8 1 12/03/2024 03:01
1,1,2-Trichloroethane ND 2.8 1 12/03/2024 03:01
Trichloroethene ND 2.8 1 12/03/2024 03:01
1,2,3-Trichloropropane ND 3.1 1 12/03/2024 03:01
Trichlorofluoromethane ND 2.9 1 12/03/2024 03:01
1,2,4-Trimethylbenzene ND 2.5 1 12/03/2024 03:01
1,3,5-Trimethylbenzene ND 2.5 1 12/03/2024 03:01
Vinyl Acetate ND 18 1 12/03/2024 03:01
(Cont.)

Page 11 of 33 ends

13.01 26.11
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
Vinyl Chloride ND 0.26 1 12/03/2024 03:01
m,p-Xylene ND 4.4 1 12/03/2024 03:01
o-Xylene ND 2.2 1 12/03/2024 03:01
Xylenes, Total ND 4.4 1 12/03/2024 03:01
Surrogates REC (%) Limits
1,2-DCA-d4 103 70-130 12/03/2024 03:01
Toluene-d8 96 70-130 12/03/2024 03:01
4-BFB 91 70-130 12/03/2024 03:01
(Cont.)

Page 12 of 33 ends

12.61 25.30
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
Acetone ND 60 1 12/03/2024 03:40
Acrolein ND 5.8 1 12/03/2024 03:40
Acrylonitrile ND 1.1 1 12/03/2024 03:40
tert-Amyl methyl ether (TAME) ND 2.1 1 12/03/2024 03:40 Benzene ND 1.6 1 12/03/2024 03:40
Benzyl chloride ND 2.7 1 12/03/2024 03:40
Bromodichloromethane ND 1.4 1 12/03/2024 03:40
Bromoform ND 5.3 1 12/03/2024 03:40
Bromomethane ND 1.9 1 12/03/2024 03:40
1,3-Butadiene ND 1.1 1 12/03/2024 03:40
2-Butanone (MEK) ND 15 1 12/03/2024 03:40
t-Butyl alcohol (TBA) ND 16 1 12/03/2024 03:40
Carbon Disulfide ND 1.6 1 12/03/2024 03:40
Carbon Tetrachloride ND 1.3 1 12/03/2024 03:40
Chlorobenzene ND 2.4 1 12/03/2024 03:40
Chloroethane ND 1.3 1 12/03/2024 03:40
Chloroform ND 2.5 1 12/03/2024 03:40
Chloromethane ND 1.0 1 12/03/2024 03:40
Cyclohexane ND 18 1 12/03/2024 03:40
Dibromochloromethane ND 4.4 1 12/03/2024 03:40
1,2-Dibromo-3-chloropropane ND 0.12 1 12/03/2024 03:40
1,2-Dibromoethane (EDB) ND 0.078 1 12/03/2024 03:40
1,2-Dichlorobenzene ND 3.0 1 12/03/2024 03:40
1,3-Dichlorobenzene ND 3.0 1 12/03/2024 03:40
1,4-Dichlorobenzene ND 3.0 1 12/03/2024 03:40
Dichlorodifluoromethane 2.5 2.5 1 12/03/2024 03:40
1,1-Dichloroethane ND 2.0 1 12/03/2024 03:40
1,2-Dichloroethane (1,2-DCA) ND 2.0 1 12/03/2024 03:40
1,1-Dichloroethene ND 2.0 1 12/03/2024 03:40
cis-1,2-Dichloroethene ND 2.0 1 12/03/2024 03:40
trans-1,2-Dichloroethene ND 2.0 1 12/03/2024 03:40
1,2-Dichloropropane ND 2.4 1 12/03/2024 03:40
cis-1,3-Dichloropropene ND 2.3 1 12/03/2024 03:40
trans-1,3-Dichloropropene ND 2.3 1 12/03/2024 03:40
(Cont.)

Page 13 of 33 ends

12.61 25.30
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
1,2-Dichloro-1,1,2,2-tetrafluoroethane ND 3.6 1 12/03/2024 03:40 Diisopropyl ether (DIPE) ND 2.1 1 12/03/2024 03:40
1,4-Dioxane ND 1.9 1 12/03/2024 03:40
Ethanol ND 95 1 12/03/2024 03:40
Ethyl acetate ND 1.9 1 12/03/2024 03:40
Ethyl tert-butyl ether (ETBE) ND 2.1 1 12/03/2024 03:40 Ethylbenzene ND 2.2 1 12/03/2024 03:40
4-Ethyltoluene ND 2.5 1 12/03/2024 03:40
Freon 113 ND 3.9 1 12/03/2024 03:40
Heptane ND 21 1 12/03/2024 03:40
Hexachlorobutadiene ND 2.2 1 12/03/2024 03:40
Hexachloroethane ND 4.9 1 12/03/2024 03:40
Hexane ND 18 1 12/03/2024 03:40
2-Hexanone ND 2.1 1 12/03/2024 03:40
4-Methyl-2-pentanone (MIBK) ND 2.1 1 12/03/2024 03:40
Methyl-t-butyl ether (MTBE) ND 1.9 1 12/03/2024 03:40
Methylene chloride ND 8.8 1 12/03/2024 03:40
Methyl methacrylate ND 2.1 1 12/03/2024 03:40
Naphthalene ND 2.7 1 12/03/2024 03:40
Styrene 2.4 2.2 1 12/03/2024 03:40
1,1,1,2-Tetrachloroethane ND 3.5 1 12/03/2024 03:40
1,1,2,2-Tetrachloroethane ND 0.70 1 12/03/2024 03:40
Tetrachloroethene 89 3.5 1 12/03/2024 03:40
Tetrahydrofuran ND 3.0 1 12/03/2024 03:40
Toluene ND 1.9 1 12/03/2024 03:40
1,2,4-Trichlorobenzene ND 3.8 1 12/03/2024 03:40
1,1,1-Trichloroethane ND 2.8 1 12/03/2024 03:40
1,1,2-Trichloroethane ND 2.8 1 12/03/2024 03:40
Trichloroethene 13 2.8 1 12/03/2024 03:40
1,2,3-Trichloropropane ND 3.1 1 12/03/2024 03:40
Trichlorofluoromethane ND 2.9 1 12/03/2024 03:40
1,2,4-Trimethylbenzene ND 2.5 1 12/03/2024 03:40
1,3,5-Trimethylbenzene ND 2.5 1 12/03/2024 03:40
Vinyl Acetate ND 18 1 12/03/2024 03:40
(Cont.)

Page 14 of 33 ends

12.61 25.30
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
Vinyl Chloride ND 0.26 1 12/03/2024 03:40
m,p-Xylene 4.4 4.4 1 12/03/2024 03:40
o-Xylene 2.9 2.2 1 12/03/2024 03:40
Xylenes, Total 7.3 2.2 1 12/03/2024 03:40
Surrogates REC (%) Limits
1,2-DCA-d4 104 70-130 12/03/2024 03:40
Toluene-d8 95 70-130 12/03/2024 03:40
4-BFB 101 70-130 12/03/2024 03:40
(Cont.)

Page 15 of 33 ends

12.16 24.63
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
Acetone ND 61 1 12/03/2024 04:20
Acrolein ND 5.9 1 12/03/2024 04:20
Acrylonitrile ND 1.1 1 12/03/2024 04:20
tert-Amyl methyl ether (TAME) ND 2.1 1 12/03/2024 04:20 Benzene ND 1.6 1 12/03/2024 04:20
Benzyl chloride ND 2.7 1 12/03/2024 04:20
Bromodichloromethane ND 1.4 1 12/03/2024 04:20
Bromoform ND 5.4 1 12/03/2024 04:20
Bromomethane ND 1.9 1 12/03/2024 04:20
1,3-Butadiene ND 1.1 1 12/03/2024 04:20
2-Butanone (MEK) ND 15 1 12/03/2024 04:20
t-Butyl alcohol (TBA) ND 16 1 12/03/2024 04:20
Carbon Disulfide ND 1.6 1 12/03/2024 04:20
Carbon Tetrachloride ND 1.3 1 12/03/2024 04:20
Chlorobenzene ND 2.4 1 12/03/2024 04:20
Chloroethane ND 1.3 1 12/03/2024 04:20
Chloroform ND 2.5 1 12/03/2024 04:20
Chloromethane ND 1.0 1 12/03/2024 04:20
Cyclohexane ND 18 1 12/03/2024 04:20
Dibromochloromethane ND 4.5 1 12/03/2024 04:20
1,2-Dibromo-3-chloropropane ND 0.12 1 12/03/2024 04:20
1,2-Dibromoethane (EDB) ND 0.079 1 12/03/2024 04:20
1,2-Dichlorobenzene ND 3.0 1 12/03/2024 04:20
1,3-Dichlorobenzene ND 3.0 1 12/03/2024 04:20
1,4-Dichlorobenzene ND 3.0 1 12/03/2024 04:20
Dichlorodifluoromethane 2.6 2.5 1 12/03/2024 04:20
1,1-Dichloroethane ND 2.0 1 12/03/2024 04:20
1,2-Dichloroethane (1,2-DCA) ND 2.0 1 12/03/2024 04:20
1,1-Dichloroethene ND 2.0 1 12/03/2024 04:20
cis-1,2-Dichloroethene ND 2.0 1 12/03/2024 04:20
trans-1,2-Dichloroethene ND 2.0 1 12/03/2024 04:20
1,2-Dichloropropane ND 2.4 1 12/03/2024 04:20
cis-1,3-Dichloropropene ND 2.3 1 12/03/2024 04:20
trans-1,3-Dichloropropene ND 2.3 1 12/03/2024 04:20
(Cont.)

Page 16 of 33 ends

12.16 24.63
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
1,2-Dichloro-1,1,2,2-tetrafluoroethane ND 3.6 1 12/03/2024 04:20 Diisopropyl ether (DIPE) ND 2.1 1 12/03/2024 04:20
1,4-Dioxane ND 1.9 1 12/03/2024 04:20
Ethanol ND 96 1 12/03/2024 04:20
Ethyl acetate ND 1.9 1 12/03/2024 04:20
Ethyl tert-butyl ether (ETBE) ND 2.1 1 12/03/2024 04:20 Ethylbenzene ND 2.2 1 12/03/2024 04:20
4-Ethyltoluene ND 2.5 1 12/03/2024 04:20
Freon 113 ND 3.9 1 12/03/2024 04:20
Heptane ND 21 1 12/03/2024 04:20
Hexachlorobutadiene ND 2.2 1 12/03/2024 04:20
Hexachloroethane ND 5.0 1 12/03/2024 04:20
Hexane ND 18 1 12/03/2024 04:20
2-Hexanone ND 2.1 1 12/03/2024 04:20
4-Methyl-2-pentanone (MIBK) ND 2.1 1 12/03/2024 04:20
Methyl-t-butyl ether (MTBE) ND 1.9 1 12/03/2024 04:20
Methylene chloride ND 8.9 1 12/03/2024 04:20
Methyl methacrylate ND 2.1 1 12/03/2024 04:20
Naphthalene ND 2.7 1 12/03/2024 04:20
Styrene ND 2.2 1 12/03/2024 04:20
1,1,1,2-Tetrachloroethane ND 3.5 1 12/03/2024 04:20
1,1,2,2-Tetrachloroethane ND 0.71 1 12/03/2024 04:20
Tetrachloroethene 190 3.5 1 12/03/2024 04:20
Tetrahydrofuran ND 3.0 1 12/03/2024 04:20
Toluene ND 1.9 1 12/03/2024 04:20
1,2,4-Trichlorobenzene ND 3.8 1 12/03/2024 04:20
1,1,1-Trichloroethane ND 2.8 1 12/03/2024 04:20
1,1,2-Trichloroethane ND 2.8 1 12/03/2024 04:20
Trichloroethene 13 2.8 1 12/03/2024 04:20
1,2,3-Trichloropropane ND 3.1 1 12/03/2024 04:20
Trichlorofluoromethane ND 2.9 1 12/03/2024 04:20
1,2,4-Trimethylbenzene ND 2.5 1 12/03/2024 04:20
1,3,5-Trimethylbenzene ND 2.5 1 12/03/2024 04:20
Vinyl Acetate ND 18 1 12/03/2024 04:20
(Cont.)

Page 17 of 33 ends

12.16 24.63
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
Vinyl Chloride ND 0.26 1 12/03/2024 04:20
m,p-Xylene ND 4.5 1 12/03/2024 04:20
o-Xylene ND 2.2 1 12/03/2024 04:20
Xylenes, Total ND 4.5 1 12/03/2024 04:20
Surrogates REC (%) Limits
1,2-DCA-d4 104 70-130 12/03/2024 04:20
Toluene-d8 95 70-130 12/03/2024 04:20
4-BFB 94 70-130 12/03/2024 04:20
(Cont.)

Page 18 of 33 ends

12.04 24.14
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
Acetone ND 60 1 12/03/2024 05:00
Acrolein ND 5.8 1 12/03/2024 05:00
Acrylonitrile ND 1.1 1 12/03/2024 05:00
tert-Amyl methyl ether (TAME) ND 2.1 1 12/03/2024 05:00 Benzene 7.8 1.6 1 12/03/2024 05:00
Benzyl chloride ND 2.7 1 12/03/2024 05:00
Bromodichloromethane ND 1.4 1 12/03/2024 05:00
Bromoform ND 5.3 1 12/03/2024 05:00
Bromomethane 4.0 1.9 1 12/03/2024 05:00
1,3-Butadiene ND 1.1 1 12/03/2024 05:00
2-Butanone (MEK) ND 15 1 12/03/2024 05:00
t-Butyl alcohol (TBA) ND 16 1 12/03/2024 05:00
Carbon Disulfide 1.8 1.6 1 12/03/2024 05:00
Carbon Tetrachloride ND 1.3 1 12/03/2024 05:00
Chlorobenzene ND 2.4 1 12/03/2024 05:00
Chloroethane ND 1.3 1 12/03/2024 05:00
Chloroform ND 2.5 1 12/03/2024 05:00
Chloromethane ND 1.0 1 12/03/2024 05:00
Cyclohexane 46 18 1 12/03/2024 05:00
Dibromochloromethane ND 4.4 1 12/03/2024 05:00
1,2-Dibromo-3-chloropropane ND 0.12 1 12/03/2024 05:00
1,2-Dibromoethane (EDB) ND 0.078 1 12/03/2024 05:00
1,2-Dichlorobenzene ND 3.0 1 12/03/2024 05:00
1,3-Dichlorobenzene ND 3.0 1 12/03/2024 05:00
1,4-Dichlorobenzene ND 3.0 1 12/03/2024 05:00
Dichlorodifluoromethane ND 2.5 1 12/03/2024 05:00
1,1-Dichloroethane ND 2.0 1 12/03/2024 05:00
1,2-Dichloroethane (1,2-DCA) ND 2.0 1 12/03/2024 05:00
1,1-Dichloroethene ND 2.0 1 12/03/2024 05:00
cis-1,2-Dichloroethene ND 2.0 1 12/03/2024 05:00
trans-1,2-Dichloroethene ND 2.0 1 12/03/2024 05:00
1,2-Dichloropropane ND 2.4 1 12/03/2024 05:00
cis-1,3-Dichloropropene ND 2.3 1 12/03/2024 05:00
trans-1,3-Dichloropropene ND 2.3 1 12/03/2024 05:00
(Cont.)

Page 19 of 33 ends

12.04 24.14
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
1,2-Dichloro-1,1,2,2-tetrafluoroethane ND 3.6 1 12/03/2024 05:00 Diisopropyl ether (DIPE) ND 2.1 1 12/03/2024 05:00
1,4-Dioxane ND 1.9 1 12/03/2024 05:00
Ethanol ND 95 1 12/03/2024 05:00
Ethyl acetate ND 1.9 1 12/03/2024 05:00
Ethyl tert-butyl ether (ETBE) ND 2.1 1 12/03/2024 05:00 Ethylbenzene 5.6 2.2 1 12/03/2024 05:00
4-Ethyltoluene ND 2.5 1 12/03/2024 05:00
Freon 113 ND 3.9 1 12/03/2024 05:00
Heptane ND 21 1 12/03/2024 05:00
Hexachlorobutadiene ND 2.2 1 12/03/2024 05:00
Hexachloroethane ND 4.9 1 12/03/2024 05:00
Hexane ND 18 1 12/03/2024 05:00
2-Hexanone ND 2.1 1 12/03/2024 05:00
4-Methyl-2-pentanone (MIBK) ND 2.1 1 12/03/2024 05:00
Methyl-t-butyl ether (MTBE) ND 1.9 1 12/03/2024 05:00
Methylene chloride ND 8.8 1 12/03/2024 05:00
Methyl methacrylate ND 2.1 1 12/03/2024 05:00
Naphthalene ND 2.7 1 12/03/2024 05:00
Styrene ND 2.2 1 12/03/2024 05:00
1,1,1,2-Tetrachloroethane ND 3.5 1 12/03/2024 05:00
1,1,2,2-Tetrachloroethane ND 0.70 1 12/03/2024 05:00
Tetrachloroethene 5.1 3.5 1 12/03/2024 05:00
Tetrahydrofuran ND 3.0 1 12/03/2024 05:00
Toluene 3.1 1.9 1 12/03/2024 05:00
1,2,4-Trichlorobenzene ND 3.8 1 12/03/2024 05:00
1,1,1-Trichloroethane ND 2.8 1 12/03/2024 05:00
1,1,2-Trichloroethane ND 2.8 1 12/03/2024 05:00
Trichloroethene ND 2.8 1 12/03/2024 05:00
1,2,3-Trichloropropane ND 3.1 1 12/03/2024 05:00
Trichlorofluoromethane ND 2.9 1 12/03/2024 05:00
1,2,4-Trimethylbenzene 11 2.5 1 12/03/2024 05:00
1,3,5-Trimethylbenzene ND 2.5 1 12/03/2024 05:00
Vinyl Acetate ND 18 1 12/03/2024 05:00
(Cont.)

Page 20 of 33 ends

12.04 24.14
Initial Pressure (psia) Final Pressure (psia) Analyst(s) PRE
Vinyl Chloride ND 0.26 1 12/03/2024 05:00
m,p-Xylene 16 4.4 1 12/03/2024 05:00
o-Xylene 6.7 2.2 1 12/03/2024 05:00
Xylenes, Total 23 2.2 1 12/03/2024 05:00
Surrogates REC (%) Limits
1,2-DCA-d4 104 70-130 12/03/2024 05:00
Toluene-d8 89 70-130 12/03/2024 05:00
4-BFB 125 70-130 12/03/2024 05:00

Page 21 of 33 ends

Quality Control Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: Ninyo & Moore
Project: 403151011; City of SSF-MSB
Date Analyzed: 11/26/2024
Date Prepared: 11/26/2024
WorkOrder: 2411F09
BatchID: 306790
Analytical Method: ASTM D 1946-90
Unit: %
Sample ID: MB/LCS/LCSD-306790
Instrument: GC51
Matrix: SoilGas
Extraction Method: ASTM D 1946-90
QC Summary Report for ASTM D1946-90
Analyte MB
Result
MDL RL
Oxygen ND 0.027 0.40 - - -
Analyte LCS
Result
LCSD
Result
SPK
Val
LCS
%REC
LCSD
%REC

LCS/LCSD
Limits

RPD RPD
Limit
Oxygen 3.5 3.5 4.2 83 83 70-130 0.276 20

Page 22 of 33 ends

Quality Control Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: Ninyo & Moore
Project: 403151011; City of SSF-MSB
Date Analyzed: 12/02/2024
Date Prepared: 12/02/2024
WorkOrder: 2411F09
BatchID: 306976
Analytical Method: ASTM D 1946-90
Unit: %
Sample ID: MB/LCS/LCSD-306976
Instrument: GC26
Matrix: Soilgas
Extraction Method: ASTM D 1946-90
QC Summary Report for ASTM D1946-90
Analyte MB
Result
MDL RL
Helium ND 0.050 0.050 - - -
Analyte LCS
Result
LCSD
Result
SPK
Val
LCS
%REC
LCSD
%REC

LCS/LCSD
Limits

RPD RPD
Limit
Helium 0.18 0.18 0.20 90 90 60-140 0.00955 20

Page 23 of 33 ends

Quality Control Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: Ninyo & Moore
Project: 403151011; City of SSF-MSB
Date Analyzed: 12/02/2024 - 12/03/2024
Date Prepared: 12/02/2024 - 12/03/2024
WorkOrder: 2411F09
BatchID: 307071
Analytical Method: TO15
Unit: µg/m³
Sample ID: MB/LCS/LCSD-307071
Instrument: GC24
Matrix: SoilGas
Extraction Method: TO15
QC Summary Report for TO15
Analyte MB
Result

MDL RL SPK
Val

MB IS/SS
%REC

MB IS/SS
Limits
Acetone ND 4.3 60 - - -
Acrolein ND 1.1 5.8 - - -
Acrylonitrile ND 0.66 1.1 - - -
tert-Amyl methyl ether (TAME) ND 1.3 2.1 - - -
Benzene ND 0.79 1.6 - - -
Benzyl chloride ND 1.7 2.7 - - -
Bromodichloromethane ND 0.13 1.4 - - -
Bromoform ND 1.1 5.3 - - -
Bromomethane ND 0.41 1.9 - - -
1,3-Butadiene ND 0.98 1.1 - - -
2-Butanone (MEK) ND 2.0 15 - - -
t-Butyl alcohol (TBA) ND 1.9 16 - - -
Carbon Disulfide ND 1.1 1.6 - - -
Carbon Tetrachloride ND 0.19 1.3 - - -
Chlorobenzene ND 0.59 2.4 - - -
Chloroethane ND 0.35 1.3 - - -
Chloroform ND 0.58 2.5 - - -
Chloromethane ND 0.52 1.0 - - -
Cyclohexane ND 1.6 18 - - -
Dibromochloromethane ND 1.1 4.4 - - -
1,2-Dibromo-3-chloropropane ND 0.074 0.12 - - -
1,2-Dibromoethane (EDB) ND 0.025 0.078 - - -
1,2-Dichlorobenzene ND 0.95 3.0 - - -
1,3-Dichlorobenzene ND 0.94 3.0 - - -
1,4-Dichlorobenzene ND 0.97 3.0 - - -
Dichlorodifluoromethane ND 0.56 2.5 - - -
1,1-Dichloroethane ND 0.50 2.0 - - -
1,2-Dichloroethane (1,2-DCA) ND 0.58 2.0 - - -
1,1-Dichloroethene ND 0.40 2.0 - - -
cis-1,2-Dichloroethene ND 0.43 2.0 - - -
trans-1,2-Dichloroethene ND 0.45 2.0 - - -
1,2-Dichloropropane ND 0.59 2.4 - - -
cis-1,3-Dichloropropene ND 0.71 2.3 - - -
trans-1,3-Dichloropropene ND 0.86 2.3 - - -
1,2-Dichloro-1,1,2,2-tetrafluoroethane ND 1.8 3.6 - - - Diisopropyl ether (DIPE) ND 0.55 2.1 - - -
1,4-Dioxane ND 0.71 1.9 - - -
Ethanol ND 3.8 95 - - -
(Cont.)

Page 24 of 33 ends

Quality Control Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: Ninyo & Moore
Project: 403151011; City of SSF-MSB
Date Analyzed: 12/02/2024 - 12/03/2024
Date Prepared: 12/02/2024 - 12/03/2024
WorkOrder: 2411F09
BatchID: 307071
Analytical Method: TO15
Unit: µg/m³
Sample ID: MB/LCS/LCSD-307071
Instrument: GC24
Matrix: SoilGas
Extraction Method: TO15
QC Summary Report for TO15
Analyte MB
Result

MDL RL SPK
Val

MB IS/SS
%REC

MB IS/SS
Limits
Ethyl acetate ND 0.63 1.9 - - -
Ethyl tert-butyl ether (ETBE) ND 0.68 2.1 - - -
Ethylbenzene ND 0.51 2.2 - - -
4-Ethyltoluene ND 0.61 2.5 - - -
Freon 113 ND 1.0 3.9 - - -
Heptane ND 2.4 21 - - -
Hexachlorobutadiene ND 0.38 2.2 - - -
Hexachloroethane ND 2.7 4.9 - - -
Hexane ND 2.2 18 - - -
2-Hexanone ND 1.6 2.1 - - -
4-Methyl-2-pentanone (MIBK) ND 0.94 2.1 - - -
Methyl-t-butyl ether (MTBE) ND 0.43 1.9 - - -
Methylene chloride ND 0.82 8.8 - - -
Methyl methacrylate ND 0.65 2.1 - - -
Naphthalene ND 1.9 2.7 - - -
Styrene ND 0.62 2.2 - - -
1,1,1,2-Tetrachloroethane ND 1.2 3.5 - - -
1,1,2,2-Tetrachloroethane ND 0.10 0.70 - - -
Tetrachloroethene ND 1.1 3.5 - - -
Tetrahydrofuran ND 0.82 3.0 - - -
Toluene ND 0.89 1.9 - - -
1,2,4-Trichlorobenzene ND 2.7 3.8 - - -
1,1,1-Trichloroethane ND 0.71 2.8 - - -
1,1,2-Trichloroethane ND 0.85 2.8 - - -
Trichloroethene ND 0.69 2.8 - - -
1,2,3-Trichloropropane ND 0.89 3.1 - - -
Trichlorofluoromethane ND 0.78 2.9 - - -
1,2,4-Trimethylbenzene ND 1.2 2.5 - - -
1,3,5-Trimethylbenzene ND 0.73 2.5 - - -
Vinyl Acetate ND 1.1 18 - - -
Vinyl Chloride ND 0.14 0.26 - - -
m,p-Xylene ND 1.1 4.4 - - -
o-Xylene ND 0.39 2.2 - - -
(Cont.)

Page 25 of 33 ends

Quality Control Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: Ninyo & Moore
Project: 403151011; City of SSF-MSB
Date Analyzed: 12/02/2024 - 12/03/2024
Date Prepared: 12/02/2024 - 12/03/2024
WorkOrder: 2411F09
BatchID: 307071
Analytical Method: TO15
Unit: µg/m³
Sample ID: MB/LCS/LCSD-307071
Instrument: GC24
Matrix: SoilGas
Extraction Method: TO15
QC Summary Report for TO15
Analyte MB
Result

MDL RL SPK
Val

MB IS/SS
%REC

MB IS/SS
Limits
Surrogate Recovery
1,2-DCA-d4 1100 1000 106 70-130
Toluene-d8 980 1000 98 70-130
4-BFB 880 1000 88 70-130
(Cont.)

Page 26 of 33 ends

Quality Control Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: Ninyo & Moore
Project: 403151011; City of SSF-MSB
Date Analyzed: 12/02/2024 - 12/03/2024
Date Prepared: 12/02/2024 - 12/03/2024
WorkOrder: 2411F09
BatchID: 307071
Analytical Method: TO15
Unit: µg/m³
Sample ID: MB/LCS/LCSD-307071
Instrument: GC24
Matrix: SoilGas
Extraction Method: TO15
QC Summary Report for TO15
Analyte LCS
Result
LCSD
Result
SPK
Val
LCS
%REC
LCSD
%REC

LCS/LCSD
Limits

RPD RPD
Limit
Acetone 19 16 12 157,F7 136 60-140 14.2 25
Acrolein 8.2 8.5 11.6 71 73 60-140 3.18 25
Acrylonitrile 14 13 11 125 120 60-140 4.42 25
tert-Amyl methyl ether (TAME) 19 20 21 90 95 60-140 4.66 25 Benzene 13 14 16 82 89 60-140 8.03 25
Benzyl chloride 29 25 26.6 110 95 60-140 14.9 25
Bromodichloromethane 38 41 35 108 117 60-140 7.81 25
Bromoform 57 59 52.6 108 112 60-140 3.49 25
Bromomethane 17 19 19.6 87 96 60-140 10.7 25
1,3-Butadiene 5.3 5.9 11 48,F2 54,F2 60-140 11.0 25
2-Butanone (MEK) 16 15 15 108 101 60-140 6.44 25
t-Butyl alcohol (TBA) 16 15 15.6 101 96 60-140 5.11 25
Carbon Disulfide 12 14 16 72 88 60-140 20.3 25
Carbon Tetrachloride 35 38 32 109 118 60-140 8.14 25
Chlorobenzene 26 27 23.6 108 113 60-140 3.84 25
Chloroethane 8.6 9.4 13.6 63 69 60-140 9.40 25
Chloroform 27 29 24.6 108 118 60-140 8.32 25
Chloromethane 9.2 9.8 10.6 87 92 60-140 5.87 25
Cyclohexane 16 17 17.6 89 95 60-140 6.18 25
Dibromochloromethane 44 46 43.6 100 105 60-140 4.73 25
1,2-Dibromo-3-chloropropane 86 76 49 175,F7 156,F7 60-140 11.7 25 1,2-Dibromoethane (EDB) 45 47 39 116 121 60-140 4.42 25 1,2-Dichlorobenzene 45 45 30.6 146,F7 147,F7 60-140 0.297 25 1,3-Dichlorobenzene 40 40 30.6 132 130 60-140 1.43 25
1,4-Dichlorobenzene 36 36 30.6 118 117 60-140 1.03 25
Dichlorodifluoromethane 25 27 25 100 109 60-140 7.89 25 1,1-Dichloroethane 19 21 20.6 93 103 60-140 9.89 25
1,2-Dichloroethane (1,2-DCA) 22 23 20.6 105 113 60-140 7.77 25 1,1-Dichloroethene 19 20 20 94 99 60-140 4.96 25
cis-1,2-Dichloroethene 19 21 20 95 104 60-140 8.73 25
trans-1,2-Dichloroethene 18 19 20 92 97 60-140 5.90 25
1,2-Dichloropropane 21 23 23.6 90 98 60-140 8.27 25
cis-1,3-Dichloropropene 24 25 23 102 108 60-140 5.29 25 trans-1,3-Dichloropropene 24 25 23 105 107 60-140 2.54 25 1,2-Dichloro-1,1,2,2-tetrafluoroethane 32 35 35.6 91 99 60-140 8.61 25 Diisopropyl ether (DIPE) 20 21 21 94 100 60-140 6.21 25 1,4-Dioxane 21 21 18.6 111 114 60-140 2.89 25
Ethanol 10 7.2 9.6 107 75 60-140 35.8,F2 25
(Cont.)

Page 27 of 33 ends

Quality Control Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: Ninyo & Moore
Project: 403151011; City of SSF-MSB
Date Analyzed: 12/02/2024 - 12/03/2024
Date Prepared: 12/02/2024 - 12/03/2024
WorkOrder: 2411F09
BatchID: 307071
Analytical Method: TO15
Unit: µg/m³
Sample ID: MB/LCS/LCSD-307071
Instrument: GC24
Matrix: SoilGas
Extraction Method: TO15
QC Summary Report for TO15
Analyte LCS
Result
LCSD
Result
SPK
Val
LCS
%REC
LCSD
%REC

LCS/LCSD
Limits

RPD RPD
Limit
Ethyl acetate 20 21 18.6 108 112 60-140 3.49 25
Ethyl tert-butyl ether (ETBE) 19 21 21 93 98 60-140 5.40 25 Ethylbenzene 22 23 22 98 104 60-140 5.22 25
4-Ethyltoluene 26 27 25 103 107 60-140 3.62 25
Freon 113 37 40 39 94 103 60-140 8.93 25
Heptane 20 21 21 94 100 60-140 6.80 25
Hexachlorobutadiene 77 77 54 143,F7 143,F7 60-140 0.507 25 Hexachloroethane 52 50 49.2 105 102 60-140 3.51 25
Hexane 15 16 18 85 91 60-140 6.55 25
2-Hexanone 22 25 21 106 121 60-140 13.4 25
4-Methyl-2-pentanone (MIBK) 22 22 21 103 106 60-140 3.17 25 Methyl-t-butyl ether (MTBE) 16 17 18.6 87 94 60-140 7.47 25 Methylene chloride 18 19 17.6 101 107 60-140 6.10 25
Methyl methacrylate 20 21 20.8 96 99 60-140 2.76 25
Naphthalene 45 42 26.5 169,F7 160,F7 60-140 5.69 25
Styrene 24 24 21.6 110 111 60-140 0.613 25
1,1,1,2-Tetrachloroethane 41 43 35 117 123 60-140 5.03 25 1,1,2,2-Tetrachloroethane 36 38 35 104 108 60-140 4.18 25 Tetrachloroethene 35 38 34.4 102 110 60-140 7.63 25
Tetrahydrofuran 15 16 15 103 104 60-140 1.41 25
Toluene 18 19 19 96 101 60-140 4.84 25
1,2,4-Trichlorobenzene 72 67 37.6 193,F7 178,F7 60-140 7.79 25 1,1,1-Trichloroethane 27 30 27.6 98 108 60-140 9.09 25
1,1,2-Trichloroethane 29 30 27.6 103 110 60-140 6.43 25 Trichloroethene 26 28 27.6 94 103 60-140 8.86 25
1,2,3-Trichloropropane 36 36 30.64 118 118 60-140 0.676 25 Trichlorofluoromethane 35 38 28.6 121 133 60-140 9.67 25 1,2,4-Trimethylbenzene 28 29 25 112 115 60-140 2.25 25
1,3,5-Trimethylbenzene 25 26 25 101 104 60-140 2.74 25
Vinyl Acetate 19 19 18 103 108 60-140 4.11 25
Vinyl Chloride 7.2 7.8 13 56,F2 60 60-140 7.64 25
m,p-Xylene 42 43 44 95 99 60-140 3.73 25
o-Xylene 23 23 22 103 105 60-140 1.59 25
(Cont.)

Page 28 of 33 ends

Quality Control Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: Ninyo & Moore
Project: 403151011; City of SSF-MSB
Date Analyzed: 12/02/2024 - 12/03/2024
Date Prepared: 12/02/2024 - 12/03/2024
WorkOrder: 2411F09
BatchID: 307071
Analytical Method: TO15
Unit: µg/m³
Sample ID: MB/LCS/LCSD-307071
Instrument: GC24
Matrix: SoilGas
Extraction Method: TO15
QC Summary Report for TO15
Analyte LCS
Result
LCSD
Result
SPK
Val
LCS
%REC
LCSD
%REC

LCS/LCSD
Limits

RPD RPD
Limit
Surrogate Recovery
1,2-DCA-d4 1100 1100 1000 105 107 70-130 1.74 25
Toluene-d8 940 930 1000 94 93 70-130 1.08 25
4-BFB 1100 1100 1000 111 107 70-130 3.28 25

Page 29 of 33 ends

McCampbell Analytical, Inc.
1534 Willow Pass Rd
Pittsburg, CA 94565-1701
(925) 252-9262
CHAIN-OF-CUSTODY RECORD Page
Lab ID Matrix Collection Date Hold
Requested Tests (See legend below)
Report to:

Gregory Roberts
1301 Marina Village Parkway, Suite 110
Alameda, CA 94501
(408) 435-9000 FAX: (510) 633-5646
PO:
11/22/2024
ClientSampID
Project: 403151011; City of SSF-MSB
WorkOrder: 2411F09
1 of 1
Date Logged:

Date Received: 11/22/2024
1 2 3 4 5 6 7 8 9 10 11 12
Ninyo & Moore
Bill to:

Accounts Payable
Ninyo & Moore
1301 Marina Village Parkway, Suite 110
Alameda, CA 94501
Requested TAT: 5 days;
ClientCode: NMO
Email: [email protected]
EDF EQuIS Email HardCopy ThirdParty
[email protected]
Excel
CLIP J-flag
cc/3rd Party:

WaterTrax
Detection Summary
Dry-Weight
[A1_Standard _QC]
2411F09-001 SV-1 SoilGas 11/20/2024 07:53 A A A
2411F09-002 SSV-2 SoilGas 11/20/2024 08:32 A A A
2411F09-003 SSV-3 SoilGas 11/20/2024 09:26 A A A
2411F09-004 SV-4 SoilGas 11/20/2024 10:22 A A A
2411F09-005 Unused Summa SoilGas <Not Provided> A
Prepared by: Valerie Alfaro
NOTE: Soil samples are discarded 60 days after receipt unless other arrangements are made (Water samples are 30 days).

Hazardous samples will be returned to client or disposed of at client expense.

Comments:
1 ATMOSPHERICGAS_SG(%) 2 HELIUM_LC_SOILGAS(%) 3 PRUNUSEDSUMMA 4 TO15_Scan-SIM_SOIL(UG/M3) 5 6 7 8
9 10
Test Legend:
11 12
The following SampIDs: 001A, 002A, 003A, 004A contain testgroup TO15He__O2_SG(UG/M3).

Project Manager: Jennifer Lagerbom

Page 30 of 33 ends

LabID ClientSampID Collection Date
& Time
Date Logged:

Matrix Test Name Cont./ TAT
Comp.

WORK ORDER SUMMARY
Work Order: 2411F09
Comments:

Client Name: NINYO & MOORE Project: 403151011; City of SSF-MSB QC Level: LEVEL 2
Dry- Hold
Weight
Sub
Out
Bottle &
Preservative
11/22/2024
Sediment
Content
CLIP EDF Excel EQuIS Email HardCopy ThirdParty J-flag
Client Contact: Gregory Roberts
Contact's Email: [email protected]
WaterTrax
Head Test Due Date
Space
U**
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" 001A SV-1 SoilGas TO15 w/ Helium plus O2 1 1L Summa 11/20/2024 7:53 5 days 12/3/2024 002A SSV-2 SoilGas TO15 w/ Helium plus O2 1 1L Summa 11/20/2024 8:32 5 days 12/3/2024 003A SSV-3 SoilGas TO15 w/ Helium plus O2 1 1L Summa 11/20/2024 9:26 5 days 12/3/2024 004A SV-4 SoilGas TO15 w/ Helium plus O2 1 1L Summa 11/20/2024 10:22 5 days 12/3/2024

Page 1 of 1 ends

* STLC and TCLP extractions require 2 days to complete; therefore, all TATs begin after the extraction is completed (i.e., One-day TAT yields results in 3 days from sample submission).

NOTES:
- MAI assumes that all material present in the provided sampling container is considered part of the sample - MAI does not exclude any material from the sample prior to sample preparation unless requested in writing by the client.

U** = An unpreserved container was received for a method that suggests a preservation in order to extend hold time for analysis. - Organic extracts are held for 40 days before disposal; Inorganic extract are held for 30 days. - ISM prep requires 5 to 10 days to complete; therefore, all TATs begin after the extraction is completed (i.e., One-day TAT yields results in 6 to 11 days from sample submission). Due date listed on WO summary will not accurately reflect the time needed for sample preparation.

Cont./Comp. = Containers /Composites

Page 31 of 33 ends

Page 32 of 33 ends

Sample Receipt Checklist
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client Name: Ninyo & Moore
WorkOrder №: 2411F09
Date Logged: 11/22/2024
Matrix: SoilGas Logged by: Valerie Alfaro
Carrier: Antonio Mason (MAI Courier)
Shipping container/cooler in good condition? Yes No
Custody seals intact on shipping container/cooler? Yes No NA Samples Received on Ice? Yes No
Chain of custody present? Yes No
Chain of custody signed when relinquished and received? Yes No Chain of custody agrees with sample labels? Yes No
Samples in proper containers/bottles? Yes No
Sample containers intact? Yes No
Sufficient sample volume for indicated test? Yes No
All samples received within holding time? Yes No NA
Sample/Temp Blank temperature NA
ZHS conditional analyses: VOA meets zero headspace Yes No NA requirement (VOCs, TPHg/BTEX, RSK)?
pH acceptable upon receipt (Metal: <2)? Yes No NA
Temp:

Chain of Custody (COC) Information
Sample IDs noted by Client on COC? Yes No
Date and Time of collection noted by Client on COC? Yes No Sampler's name noted on COC? Yes No
Sample Receipt Information
Sample Preservation and Hold Time (HT) Information
Sample labels checked for correct preservation? Yes No
Project: 403151011; City of SSF-MSB
Comments:
pH tested and acceptable upon receipt (200.7: ≤2; 533: 6 - 8; 537.1: 6 - 8)?
Yes No NA
UCMR Samples:

Free Chlorine tested and acceptable upon receipt (<0.1mg/L) [not applicable to 200.7]?
Yes No NA
Date and Time Received: 11/22/2024 14:16
Received by: Valerie Alfaro
COC agrees with Quote? Yes No NA
Custody seals intact on sample bottles? Yes No NA

Page 33 of 33 ends

South San Francisco City CouncilApril 29, 2025

South San Francisco City Council
April 29, 2025