> Appendix-J-Phase2-ESA — San Marcos City Council, June 24, 2025

Phase II Environmental Site
Assessment

225 North Las Posas Road
San Marcos, California 92069

March 23, 2021

Prepared for:

City Ventures
3121 Michelson Drive, Suite 150
Irvine, California 92612

Prepared by:

Stantec Consulting Services Inc.
735 E. Carnegie Drive, Suite 280
San Bernardino, CA 92408

Project No.: 185805035

PHASE II ENVIRONMENTAL SITE ASSESSMENT

This document entitled Phase II Environmental Site Assessment was prepared by Stantec Consulting Services Inc. (“Stantec”) for the account of City Ventures (the “Client”). Any reliance on this document by any third party is strictly prohibited. The material in it reflects Stantec’s professional judgment in light of the scope, schedule and other limitations stated in the document and in the contract between Stantec and the Client. The opinions in the document are based on conditions and information existing at the time the document was published and do not take into account any subsequent changes. In preparing the document, Stantec did not verify information supplied to it by others. Any use which a third party makes of this document is the responsibility of such third party. Such third party agrees that Stantec shall not be responsible for costs or damages of any kind, if any, suffered by it or any other third party as a result of decisions made or actions taken based on this document.

Prepared by
(signature)
Deborah Hernandez
Geologic Staff

Reviewed by
(signature)
Alicia Jansen
Associate Scientist

Approved by
(signature)
Kyle Emerson, PG, CEG
Managing Principal Geologist

PHASE II ENVIRONMENTAL SITE ASSESSMENT

Table of Contents
EXECUTIVE SUMMARY ................................................................................................................. I

1.0 INTRODUCTION ............................................................................................................. 1.1

1.1 SITE DESCRIPTION AND OPERATIONS ..................................................................... 1.1

1.2 SITE GEOLOGY AND HYDROGEOLOGY ..................................................................... 1.1

2.0 BACKGROUND INFORMATION .................................................................................... 2.2

3.0 FIELD INVESTIGATION PROGRAM ............................................................................. 3.1

3.1 PRE-ASSESSMENT ACTIVITIES ................................................................................... 3.1

3.2 FIELD INVESTIGATION .................................................................................................. 3.1

3.2.1 Soil Boring and Sampling Procedures ........................................................... 3.2

3.2.2 Soil Vapor Probe Installation and Sampling Procedures .............................. 3.2

4.0 LABORATORY TESTING PROGRAM ........................................................................... 4.1

5.0 INVESTIGATION RESULTS ........................................................................................... 5.1

5.1 FIELD OBSERVATIONS ................................................................................................. 5.1

5.2 ANALYTICAL RESULTS ................................................................................................. 5.1

5.2.1 Soil Analytical Results ................................................................................... 5.1

5.2.2 Soil Vapor Analytical Results ......................................................................... 5.1

6.0 CONCLUSIONS AND RECOMMENDATIONS .............................................................. 6.1

7.0 LIMITATIONS .................................................................................................................. 7.1

8.0 REFERENCES ................................................................................................................ 8.1

LIST OF TABLES
Table 1 – Summary of Soil Analytical Results
Table 2 – Summary of Soil Vapor Analytical Results

LIST OF FIGURES
Figure 1 – Property Location Map
Figure 2 – Property Details

LIST OF APPENDICES
Appendix A – Summary of GPR Findings Report
Appendix B – Laboratory Data Sheets

PHASE II ENVIRONMENTAL SITE ASSESSMENT
i

Executive Summary
This report documents the methodology and results of a Phase II Environmental Site Assessment (ESA) completed by Stantec Consulting Services Inc. (Stantec) for 2.5 Acres of Vacant Land addressed as 225 North Las Posas Road, San Marcos , California (the “Property”). This scope of work was completed in accordance with the Master Services Agreement with the client (the “MSA”), based on the scope of work set forth in the Proposal to Conduct Phase II Environmental Site Investigation dated February 11, 2021. All work shall be completed in accordance with the limitations stated in the Consultant Agreement between City Ventures and Stantec.

Stantec completed a Phase I ESA for the Property in March 2021. Tha t report identified the following recognized environmental conditions (RECs) in connection with the Property:
• Underground Storage Tank (USTs). A 550 -gallon diesel UST was reportedly installed at the Property in the northwestern corner of the Property in 1972. No leaks or spills have been reported for the Property; however, the presence of UST onsite constitutes a REC for the Property. Stantec recommended performing a ground penetrating radar (GPR) survey to verify if the UST remains on the Property. In addition, Stantec recommended that a soil and soil vapor assessment be completed at the UST location to evaluate the subsurface conditions beneath the Property. • Railroad Spurs. Railroad spurs are located adjacent to the north of the Property. Herbicides are commonly applied to railroad alignments, and heavy metals associated with herbicidal application are commonly found in these areas. Due to the presence of the spur, Stantec recommended performing a Phase II subsurface investigation to sample and analyze shallow soil samples along this Property boundary nearest the rail line for the presence of heavy-metals. The need for sampling for these compounds given the intended use is for protection of construction workers during development of the paths when exposed to dust. The second issue is the potential for off -Site removal of soil, which will require profiling by chemical analysis to determine the proper location for disposal.

Based on the results of the Phase I ESA report, Stantec created a scope of work which would address the identified RECs.

Stantec provided the services of a field geologist to supervise and direct all on-site activities. Soil sampling and installation of soil vapor probes was performed between February 22 and March 4, 2021. All field work was performed under the supervision of a State of California registered professional geologist, and included the following activities:
• On February 22, 2021, Stantec oversaw a ground penetrating radar (GPR) survey performed by GPRS, a utility subcontractor, to locate any suspected UST or UST -related piping or other anomalies remaining on the Property. The scope of work consisted of scanning a 15’ x 30’ area of the northwestern portion of the Property. An anomaly which may be a potential UST was

PHASE II ENVIRONMENTAL SITE ASSESSMENT
ii

detected in the northwest portion of the Property at approximately 2 to 4-feet in depth. The location is shown on Figure 2 and the geophysical survey results attached in Appendix A. • On March 1, 2021, Stantec advanced four soil boring s; however, two locations in the western perimeter hit refusal at approximately 2-feet below ground surface (bgs) and were abandoned. Soil samples were collected from two locations (S-1 and S-2) along the northern perimeter at 1, 2, and 3-feet bgs to evaluate the adjacent railroad tracks and submitted for analysis of organochlorine pesticides, lead, and arsenic . The deeper soil samples (2 and 3 -feet bgs) were place on hold pending analysis of the shallow soil samples.

Two soil borings (SV-1 and SV-2) were advanced in the vicinity of the anomaly (i.e. potential UST) on the northwestern corner of the Property. Due to difficult drilling conditions (i.e. cobbles), the soil vapor probe for SV-1 was set at 3.5-feet bgs and the soil vapor probe SV-2 was set at 4-feet bgs.

The results of soil samples collected along the northern Property line near the rail line were "non-detect" for arsenic and organochlorine pesticides (OCPs) with the exception of a minor detection of Heptachlor at

0.0014 mg/kg, well below its screening levels for residential uses . Lead was detected at 4.8 and 7.2 milligrams per kilogram (mg/kg) in S-1 and S-2, respectively. Because all detected metals concentrations are within typical California naturally-occurring background concentration ranges, and do not exceed DTSC HERO Note 3 or EPA RSLs for residential use, the adjacent railroad tracks do not represent a REC to the Property and no further assessment appears warranted.

Total Petroleum Hydrocarbons as vapor (TPHv) and various VOCs were detected at low concentrations .

These concentrations were all below the most conservative screening level between the USEPA Region 9 RSL and DTSC HERO Note 3 with an attenuation factor of 0.03, with the exception of benzene. Benzene was detected at 5.7 micrograms per cubic meter ( µg/m3) is SV-2 which is above the regulatory screening level with an attenuation factor of 0.03 (3.2 µ g/m3), but below the regulatory screening level with an attenuation factor or 0.001 (97 µ g/m3). Given the concentration was only slightly above the regulatory screening level with an attenuation factor of 0.03 (which is not the official screening level and which has not been adopted by any state agency), and well below the risk-based screening level of 97 µg/m3, this single detection is considered a de minimis condition and no further assessment appears warranted for soil vapor.

The GPR Survey identified an anomaly which may be the 550-gallon UST in the northwest portion of the Property at approximately 2 to 4- feet in depth. Stantec recommends removing and disposing of the UST in accordance with all applicable laws.

The preceding summary is intended for informational purposes only and reading the full body of this report is recommended.

PHASE II ENVIRONMENTAL SITE ASSESSMENT
Introduction

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1.0 INTRODUCTION
This report documents the methodology and results of a Phase II Environmental Site Assessment (ESA) completed by Stantec Consulting Services Inc. (Stantec) for the property located at 225 North Las Posas Road, City of San Marcos, County of San Diego, California (the “ Property”). This scope of work was completed in accordance with the Proposal to Conduct Phase II Environmental Site Investigation, dated and approved by the Client on February 11, 2021.

1.1 SITE DESCRIPTION AND OPERATIONS
The Property consists of approximately 2.5 acres of vacant land located at 225 North Las Posas Road in the city of San Marcos, California . Surrounding properties are a mix of residential, commercial/industrial, and vacant properties. A Property location map is illustrated on Figure 1. A Property map illustrating the main features of the Property is provided as Figure 2. Photographs taken during the site reconnaissanc e visit are provided in Appendix A.

The Assessor Parcel Number (APN) associated with the Property is 19-162-57-00.

1.2 SITE GEOLOGY AND HYDROGEOLOGY
The Property is located within the San Marcos Valley Groundwater Basin. This groundwater basin underlies the San Marcos Valley in northwestern San Diego County. The basin is bound by semi- permeable marine and non-marine deposits and impermeable metamorphic and granitic rock. San Marcos Creek drains to the southwest towards Lake San Marcos. An average annual rainfall is between 11 and 15 inches. Water bearing materials include residuum, which consists of weathered bedrock, and Quaternary alluvium, which consists of sand, clay, gravel, and silt that has a maximum thickness of 175 feet. Wells located within the basin can produce up to 60 gallons of water per minute from the alluvium (DWR, 2003).

Water recharge within the basin mainly occurs through rainfall on the valley floor and ephemeral stream flow. Groundwater typically flows to the southwest and follows San Marcos Creek. Water levels have been measured within 10 feet of the ground surface (DWR, 2003).

According to information obtained from the State Water Resources Control Board (SWRCB) online database (Geotracker) for a site located approximately 1,485 feet to the southeast, groundwater was encountered between approximately 3.21 and 12.48 feet bgs with a groundwater flow direction most frequently to the south southwest (Hargis & Associates, Inc., 2013).

PHASE II ENVIRONMENTAL SITE ASSESSMENT
Background Information

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2.0 BACKGROUND INFORMATION
Stantec completed a Phase I ESA for the Property in March 2021. That report identified the following recognized environmental conditions (RECs) in connection with the Property:
• Underground Storage Tank (USTs). A 550 -gallon diesel UST was reportedly installed at the Property in the northwestern corner of the Property in 1972. No leaks or spills have been reported for the Property; however, the presence of UST onsite constitutes a REC for the Property. Stantec recommended performing a ground penetrating radar (GPR) survey to verify if the UST remains on the Property. In addition, Stantec recommended that a soil and soil vapor assessment be completed at the UST location to evaluate the subsurface conditions beneath the Property. • Railroad Spurs. Railroad spurs are located adjacent to the north of the Property. Herbicides are commonly applied to railroad alignments, and heavy metals associated with herbicidal application are commonly found in these areas. Due to the presence of the spur, Stantec recommended performing a Phase II subsurface investigation to sample and analyze shallow soil samples along this Property boundary nearest the rail line for the presence of heavy-metals. The need for sampling for these compounds given the intended use is for protection of construction workers during development of the paths when exposed to dust. The second issue is the potential for off -Site removal of soil, which will require profiling by chemical analysis to determine the proper location for disposal.

Based on the results of the Phase I ESA report, Stantec created a scope of work which would address the identified RECs. The scope of work is discussed in Section 3.2.

PHASE II ENVIRONMENTAL SITE ASSESSMENT
Field Investigation Program

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3.0 FIELD INVESTIGATION PROGRAM

3.1 PRE-ASSESSMENT ACTIVITIES
The scope of work consisted of the following general elements:

Prior to the commencement of fieldwork activities, Stantec made the following preparations:
• As required by law, Stantec visited the Site to mark the proposed boring locations and acquire a current Underground Service Alert (USA) ticket number prior to commencement of Property drilling activities.
• In accordance with federal OSHA regulations (29 CFR, Section 1910.120), Stantec developed a site-specific Health and Safety Plan (HASP) for the subject property. All Stantec personnel and subcontractors associated with the project were required to be familiar with, and comply with, all provisions of the HASP.

3.2 FIELD INVESTIGATION
Stantec provided the services of a field geologist to supervise and direct all on-site activities. Soil sampling and installation of soil vapor probes was performed between February 22 and March 4, 2021. All field work was performed under the supervision of a State of California registered professional geologist, and included the following activities:

Ground Penetrating Radar Survey
On February 22, 2021, Stantec oversaw a ground penetrating radar (GPR) survey performed by GPRS, a utility subcontractor, to locate any suspected UST or UST -related piping or other anomalies remaining on the Property. The scope of work consisted of scanning a 15’x30’ area of the northwestern portion of the Property. An anomaly which maybe a potential UST was detected in the north-west portion of the Property at approximately 2 to 4-feet in depth. A copy of the GPR report is provided in Appendix A.

Railroad Spurs
On March 1, 2021, Stantec advanced four soil borings; however, two locations in the western perimeter hit refusal at approximately 2- feet below ground surface (bgs) and were abandoned. Soil samples were collected from two locations (S-1 and S-2) along the northern perimeter at 1, 2, and 3-feet bgs to evaluate the adjacent railroad tracks and submitted for analysis of organochlorine pesticides, lead, and arsenic. The deeper soil samples (2 and 3-feet bgs) were place on hold pending analysis of the shallow soil samples.

PHASE II ENVIRONMENTAL SITE ASSESSMENT
Field Investigation Program

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Former 550-Gallon UST
On March 1, 2021, two soil borings (SV -1 and SV -2) were advanced in the vicinity of the anomaly (i.e. potential UST) on the northwestern corner of the Property. Due to difficult drilling conditions (i.e. cobbles), the soil vapor probe for SV-1 was set at 3.5-feet bgs and the soil vapor probe SV-2 was set at 4-feet bgs.

3.2.1 Soil Boring and Sampling Procedures
Hand Auger Borings/Sampling
All four (4) borings were advanced using a 4” hand auger to the respective desired depths. Samples S-1 and S-2 shallow soil samples were collected at 0.5- and 3-feet bgs. Upon extraction of the auger bucket at the prescribed sampling depths, the soils contained therein were packed into laboratory -provided clean 8- ounce glass jars and labeled with the appropriate identification information (boring number, sample depth, sample collection date, and sample collection time). The samples were logged on a chain-of-custody form and placed in an ice-filled cooler for transport to the laboratory.

No soil samples were retrieved from the SV-1 and SV-2 boring locations. Stantec attempted two locations in the western perimeter of the Property; however, due to difficult drilling conditions (i.e. cobbles) the borings were abandoned at 2 feet bgs. SV-1 was advanced to approximately 3.5 -feet below ground surface and boring SV-2 was advanced to approximately 4-feet below ground surface. Both borings hit refusal at their before reaching a desired depth of 5-ft bgs and a soil vapor sampling point was installed at their maximum depths.

Field Equipment Cleaning Procedures
To maintain quality control during drilling operations, all hand auger buckets and reusable soil sampling equipment was decontaminated using a triple bucket rinse. Prior to drilling at a given location or sampling interval, all equipment coming in direct contact with soil samples was scrubbed with an Alconox scrub solution followed by a clean tap water rinse and then a final distilled water rinse. The disposable acetate soil sample liners were used for one sampling interval and then discarded.

Investigation-Derived Waste
All soil cuttings generated during the Phase II ESA investigation were placed in single California Department of Transportation-approved 55-gallon steel drum, which are located on the Property. Disposal of the drum is pending.

3.2.2 Soil Vapor Probe Installation and Sampling Procedures Soil Vapor Probe Installation
As indicated in Section 3.2.1, the soil vapor sample borings were advanced using a 4” hand auger bucket.

Following soil sampling, SV-1 and SV-2 were completed with soil vapor sampling points at the prescribed depth intervals. Each sample probe was constructed with an airstone sampling prob set at the 3.5- or 4- foot bgs sampling interval. Each of the sampling screens were connected to the ground surface via

PHASE II ENVIRONMENTAL SITE ASSESSMENT
Field Investigation Program

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dedicated ¼-inch outer diameter Nylaflow® nylon tubing. The annulus around the exposed probe tip was backfilled with washed #3 silica sand filter pack, totaling approximately 6 inches in height. Above the filter pack, a 3-inch transition zone was constructed using dry bentonite granules. From that point to ground surface, hydrated bentonite granules were utilized to seal the annular space. At the surface, the exposed nylon tubing was capped with tight fitting plastic end- caps and labeled to indicate sampling depth. After placement of the soil vapor sample probes on March 1, 2021 subsurface conditions were allowed to equilibrate for a period of at least 48-hours prior to leak testing and sample collection on March 4, 2021.

Soil Vapor Probe Sampling
Subsurface soil vapor sampling was performed in accordance with the July 2015 Department of Toxic Substances Control (DTSC) “Advisory - Active Soil Gas Investigations” (DTSC Advisory).

Prior to sample collection, a shut-in test was performed on the above -ground sampling train. The sample tubing was evacuated of air to a measured vacuum of approximately 100 inches of water column and the vacuum was sealed in with closed valves on opposite ends of the sampling train. A vacuum gauge connected to the line was observed for at least one minute for any signs of a loss in vacuum. If vacuum loss was identified during the shut -in test, the sampling technician inspected and adjusted the sampling train fittings until the shut-in test showed no vacuum loss.

As specified in the DTSC Advisory, a default purge of 3 volumes of the sampling system was performed prior to sample collection. This process included purging the sampling system (tubing, sample screen, and void space of sand pack and dry bentonite) using a flow rate of 200 milliliters per minute (ml/min) or less while maintaining a low vacuum of 100 inches of water or less. This purging was performed using a SKC sample pump calibrated to 200 ml/min.

Once purging activities were completed, the fitting were adjusted to connect the sampling tubing to the sample collection container. During soil vapor sampling, a leak check was performed using 1,1- difluoroethane (DFA) as a tracer compound. The tracer compound was applied to a clean rag and situated around the monitoring point to evaluate seal integrity. Seal integrity was confirmed by the absence of the tracer compound in the collected samples. All soil vapor samples were collected into 400ml Summa® canisters fitted with 200 ml/min flow controllers. Th e samples were logged onto a chain- of-custody form with all sample details including collection date and time. All sampling equipment and the chain-of-custody form were shipped to a fixed laboratory for analyses.

PHASE II ENVIRONMENTAL SITE ASSESSMENT
Laboratory Testing Program

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4.0 LABORATORY TESTING PROGRAM
A total of six (6) soil samples were collected during this investigation and delivered under chain-of-custody to Advanced Technology Laboratories (ATL) based in Signal Hill, California for possible chemical analyses.

A total of two (2) soil vapor samples and one replicate were collected during this investigation and delivered under chain-of-custody to H&P Mobile Geochemistry (based out of Carlsbad, California) for Total Petroleum Hydrocarbons as Vapor (TPHv) and VOCs by EPA Method TO -15. ATL and H&P are certified to perform hazardous waste testing by the State of California Department of Health Services, Environmental Laboratory Accreditation Program.

Of the 6 soil samples collected, two (2) soil samples were analyzed for organochlorine pesticides (OCPs) by EPA Method 8081A and arsenic/lead by EPA Method 6010B. All soil samples collected during this investigation were kept on-ice during transit to the laboratory.

PHASE II ENVIRONMENTAL SITE ASSESSMENT
Investigation Results

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5.0 INVESTIGATION RESULTS

5.1 FIELD OBSERVATIONS
On March 1, 2021, Stantec personnel oversaw the advancement of six (6) soil borings, and the installation of two (2) soil vapor borings within two of these borings at the Property. Soils encountered during this investigation consisted primarily of poorly graded sand and silty sand with large cobbles to a maximum explored depth of four feet bgs. No staining or odorous soils were observed in any borings during this investigation. PID measurements were recorded at 0.0 parts per million by volume (ppmV) within all soils collected. No groundwater was not encountered during this investigation.

5.2 ANALYTICAL RESULTS
Laboratory analytical test results from this assessment are summarized in the attached Table 1 and Table 2, and presented on the laboratory data sheets attached as Appendix B. The laboratory test results from this investigation are discussed below . Soil analytical results were compared to the more conservative value between the DTSC Human and Ecological Risk Office (HERO) Note 3 screening level for residential use (DTSC, 2020 ) and the EPA Regional Screening Levels (RSL), Region 9 for residential sites (EP A, 2020). Soil vapor analytical results were compared to the more conservative value between the DTSC HERO Note 3 screening levels using an attenuation factor of 0.001 and using an attenuation factor of 0.03 (the latter of which is unpublished and unofficial).

5.2.1 Soil Analytical Results
Arsenic was not detected above the laboratory reporting limits (i.e. non-detect). Lead was detected at 4.8 and 7.2 milligrams per kilogram (mg/kg) in S -1 and S-2, respectively. All detected metals concentrations are within typical California background concentration ranges, and do not exceed DTSC HERO Note 3 or EPA RSLs for residential use. There were no detections of organochlorine pesticides ( OCPs) above the laboratory reporting limits (i.e. non-detect) with the exception of a minor detection of Heptachlor at 0.0014 mg/kg, which does not represent an environmental concern.

5.2.2 Soil Vapor Analytical Results
A total of two (2) soil vapor samples and one replicate sample were collected and analyzed during this investigation to characterize possible vapor impacts at the Property.

Total Petroleum Hydrocarbons as vapor (TPHv) and various VOCs were dete cted at low concentrations including benzene, toluene, p/m-xylenes, trichloroethene (TCE), 1,2,4- Trimethylbenzene, methylene chloride, and carbon disulfide. These concentrations were all below the applicable screening level and below the most conservative screening level between the USEPA Region 9 RSL and DTSC HERO Note 3 with an attenuation factor of 0.03, with the exception of benzene. Benzene was detected at 5.7 micrograms per cubic meter (µg/m
3) is SV-2 which is above the regulatory screening level with an attenuation factor of

PHASE II ENVIRONMENTAL SITE ASSESSMENT
Investigation Results

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0.03 (3.2 µg/m3), which is not official, but below the published and applicable regulatory screening level that utilizes an attenuation factor or 0.001 (97 µg/m3).

PHASE II ENVIRONMENTAL SITE ASSESSMENT
Conclusions and Recommendations

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6.0 CONCLUSIONS AND RECOMMENDATIONS
The results of soil samples collected along the northern Property line near the rail line were "non-detect" for arsenic and organochlorine pesticides (OCPs) with the exception of a minor detection of Heptachlor at

Total Petroleum Hydrocarbons as vapor (TPHv) and various VOCs were detected at low concentrations .

PHASE II ENVIRONMENTAL SITE ASSESSMENT
Limitations

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7.0 LIMITATIONS
The conclusions presented in this report are professional opinions based on data described in this report.

The opinions of this report have been arrived at in accordance with currently accepted hydrogeologic and engineering standards and practices applicable to this location and are subject to the following inherent limitations. Stantec makes no other warranty, either expressed or implied, concerning the conclusions and professional advice that is contained within the body of this report.

Inherent in most projects performed in a heterogeneous subsurface environment, continuing excavation and assessments may reveal findings that are different than those presented herein. This facet of the environmental profession should be considered when formulating professional opinions on the limited data collected on these projects.

This report has been issued with the clear understanding that it is the responsibility of the owner, or their representative, to make appropriate notifications to regulatory agencies. It is specifically not the responsibility of Stantec to conduct appropriate notifications as specified by current County and State regulations.

The information presented in this report is valid as of the date our exploration was performed. Site conditions may degrade with time; consequently, the findings presented herein are subject to change. In the event of any conflict between the terms and conditions of this report and the terms and conditions of the Consultant Agreement between Stantec and City Ventures (the “MSA”), the MSA shall control.

PHASE II ENVIRONMENTAL SITE ASSESSMENT
References

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8.0 REFERENCES
California Water Resources Control Board, 2019, San Francisco Bay Regional Water Quality Control Board, Environmental Screening Levels, date January 24.

Department of Toxic Substances Control, 2020, Human and Ecologic Risk Office Note 3, dated June.

Stantec Consulting Services Inc, 2021, Phase I Environmental Site Assessment, dated March State Water Resource Control Board’s Geotracker, 2021, website https://geotracker.waterboards.ca.gov/ United Stated Environmental Protection Agency, 2020, Regional Screening Levels, Region 9, dated May.

PHASE II ENVIRONMENTAL SITE ASSESSMENT

TABLES

TABLE 1
Summary of Soil Analytical Results
225 Las Posas Avenue, San Marcos California
185805035
Arsenic Lead 4,4'-DDD 4,4'-DDE 4,4'-DDT gamma-
Chlordane Toxaphene Others

0.68 400 1.9 2.0 1.9 NE 0.49 Varies

0.41 80 1.9 23 37 NE 0.45 Varies

0.6 - 11.0 12.4 - 97.1 NE NE NE NE NE Varies
S-1-1 1.0 3/4/21 <1.0 4.8 <0.002 <0.002 <0.002 <0.001 <0.050 <varies S-2-1 1.0 3/4/21 <1.0 7.2 <0.002 <0.002 <0.002 <0.001 <0.050 Heptachlor: 0.0014 Notes:

All concentrations reported in miligrams per kilogram (mg/kg). (1) -
DTSC - Department of Toxic Substance Control
HERO HHRA - Human and Ecological Risk Office Human Health Risk Assessment NA - Not Analyzed BOLD Denotes analyte was detected above the laboratory reporting limit NE - Not Established < - Denotes analyte was not detected above the laboratory reporting limit RSL - Regional Screening Level Yellow shading indicates value above the residential screening level.

USEPA - United States Environmental Protection Agency
OCPs - Organochlorine Pesticides
California Background Levels (2)
Site Wide
More conservative screening level between USEPA Region 9 RSL (May, 2020) and DTSC HERO Note 3 (June, 2020)
Arsenic and Lead
by 6010B OCPs by 8081A
DTSC HERO Note 3 (Residential)
Boring Location Sample ID
Sample
Depth
(feet)
Sample
Date
USEPA RSLs (Residential)
TABLE 2
Summary of Soil Vapor Analytical Results
225 Las Posas Avenue, San Marcos California
185805035
Benzene Toluene p/ m- Xylenes TCE 1,2,4-
Trimethylbenzene Various
3,
300 3.2 10, 333 560 16 2,100 Various
-- 97 310,00 560 480 63,000 Various
SV-1 3.5 3/4/21 150 2.9 8.4 3.8 <2.2 <2.0 <various
SV-1 (REP) 3.5 3/ 4/21 120 2.4 8.8 3.8 <2.2 <2.0 <various SV-2 4.0 3/ 4/21 360 5.7 11 4.0 2.2 2.3 Methylene Chloride: 1.6 Carbon Disulfide: 1.4
Notes:

All concentrations reported in micrograms per cubic meter (µg/m3) (1) -
DTSC -
ESL - Environmental Screening Level
HERO HHRA - Human and Ecological Risk Office Human Health Risk Assessment NE - Not Established
VOC
- Volatile Organic Compounds
TCE - Trichloroethane
BOLD Denotes analyte was detected above the laboratory reporting limit < - Denotes analyte was not detected above the laboratory reporting limit VOC by 8260B
Residential Screening Levels (0.001 AF) 1
TPHv (C5-
C12)
Residential Screening Level (0.03 AF) 1
More conservative screening level between USEPA Region 9 RSL (May, 2020) and DTSC HERO Note 3 (June, 2020); San Francisco Bay Regional Water Quality Control Board ESLs (January 2019) used for TPH screening.

Department of Toxic Substance Control
Sample ID Sample Depth
(feet)
Sampling
Date

PHASE II ENVIRONMENTAL SITE ASSESSMENT

FIGURES

Project
Location
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185805035
Phase I Environmental Site Assessment
225 North Las Posas
San Marcos, California
Prepared by DH on 2021-02-22
TR by SET on 2021-02-22
IR by AJ on 2021-02-22
Property Location Map
Disclaimer: This document has been prepared based on information provided by others as cited in the Notes section. Stantec has not verified the accuracy and/or completeness of this information and shall not be responsible for any errors or omissions which may be incorporated herein as a result. Stantec assumes no responsibility for data supplied in electronic format, and the recipient accepts full responsibility for verifying the accuracy and completeness of the data.

Notes

1. Coordinate System: NAD 1983 UTM Zone 11N

2. Data Sources: Stantec, 2021

3. Background: Sources: Esri, HERE, Garmin,
Intermap, increment P Corp., GEBCO, USGS, FAO,
NPS, NRCAN, GeoBase, IGN, Kadaster NL,
Ordnance Survey, Esri Japan, METI, Esri China
(Hong Kong), swisstopo, © OpenStreetMap
contributors, and the GIS User Community
Figure No.

Title
Project Location
Client/Project
Property Boundary
(At original document size of 8.5x11)
1:24,000 (
$ $¯
0 1,200 2,400
Feet
Project
Location
V:\1858\active\185805035\05_report_deliv\drawings_design\gis_map Revised: 2021-02-22 By: dehernandez 2 City Ventures
185805035
Phase I Environmental Site Assessment
225 North Las Posas
San Marcos, California
Prepared by DH on 2021-02-22
TR by SET on 2021-02-22
IR by AJon 2021-02-22

PROPERTY DETAILS
Disclaimer: This document has been prepared based on information provided by others as cited in the Notes section. Stantec has not verified the accuracy and/or completeness of this information and shall not be responsible for any errors or omissions which may be incorporated herein as a result. Stantec assumes no responsibility for data supplied in electr onic format, and the recipient accepts full responsibility for verifying the accuracy and completeness of the data.

Notes

1. Coordinate System: NAD 1983 UTM Zone 11N

2. Data Sources: Stantec, 2021

3. Background: Source: Esri, DigitalGlobe, GeoEye,
Earthstar Geographics, CNES/Airbus DS, USDA,
USGS, AeroGRID, IGN, and the GIS User
Community
Figure No.

Title
Project Location
Client/Project
Property Boundary
6RLO6DPSOH/RFDWLRQ
6RLO9DSRU/RFDWLRQ
(At original document size of 8.5x11)
1:2,000 (
$ $¯
0 100 200
Feet
:0,66,21675((7
1/$6326$652$'
$5025/,7('5,9(

MISC DEBRIS
AT&T

BUILDING

RESTAURANT
ACCESS
ROAD

RESIDENTIAL

DEVELOPMENT

UNIVERSITY PARKING

GAS STATION

VACANT LOT

RESIDENTIAL

DEVELOPMENT

DEBRIS AND SOIL PILE

APPROXIMATE LOCATION OF
FORMER 1000-GAL DIESEL UST

APPROXIMATE LOCATION OF
FORMER 5000-GAL DIESEL UST APPROXIMATE LOCATION OF
FORMER 550-GAL DIESEL UST
S-1
S-2
SV-1
SV-2
BORING

REFUSAL

PHASE II ENVIRONMENTAL SITE ASSESSMENT

APPENDIX A

SUMMARY OF GPR FINDINGS REPORT

Summary of Scanning for Underground
Storage Tanks (UST's)
Prepared For: Stantec
Prepared By:

Ivan Martinez
[email protected]
Project Manger-West Coast Region | LA/OC
213.215.7183
February 22, 2021

Page 1 of 6 ends

February 22, 2021
Stantec
Attn: Alicia Jansen
Site: 225 Las Posas Road, San Marcos, CA
We appreciate the opportunity to provide this report for our work completed on February 19, 2021.

PURPOSE
The purpose of this project was to search for any suspected underground storage tanks (USTs) or suspected UST-related piping or other anomalies remaining on the property. The scope of work consisted of one location measuring approximately 15’x30’. The interiors of buildings were excluded from the scope of this project. The client marked the desired locations prior to our sc anning and our markings were then placed onto the surface using spray paint.

EQUIPMENT
• Underground Scanning GPR Antenna. The antenna with frequencies ranging from 250 MHz-450 MHz is mounted in a stroller frame which rolls over the surface. The surface needs to be reasonably smooth and unobstructed in order to obtain readable scans.

Obstructions such as curbs, landscaping, and vegetation will limit the feasibility of GPR. The data is displayed on a screen and marked in the field in real time. The total depth achieved can be as much as 8’ or more with this antenna but can vary widely depending on the types of materials being scanned through. Some soil types such as clay may limit maximum depths to 3’ or less. As depth increases, targets must be larger in order to be detected and non-metallic targets can be especially difficult to locate. Depths provided should always be treated as estimates as their accuracy can be affected by multiple factors. For more information, please visit: Link

Page 2 of 6 ends

PROCESS
Initial GPR scans were collected in order to evaluate the data and calibrate the equipment. Based on these findings, a scann ing strategy is formed, consisting of scanning the entire area in a grid with 16” scan spacing in order to locate any potential UST’s that may remain at the site. The GPR data is viewed in real time and anomalies in the data were located and marked on the surfac e along with their depths using spray paint. Relevant scan examples were saved and will be provided in this report.

LIMITATIONS
Please keep in mind that there are limitations to any subsurface investigation. The equipment may not achieve maximum effectiveness due to soil conditions, above ground obstructions, reinforced concrete, and a variety of other factors. No subsurface investigation or equipment can provide a complete image of what lies below. Our results should always be used in conjunction with as many methods as possible including consulting existing plans and drawings, exploratory excavation or potholing, visual inspection of above-ground features, and utilization of services such as One Call/811. Depths are dependent on many factors so depth accuracy can vary throughout a site and should be treated as estimates only. Relevant scan examples were saved and will be provided in this report. Thick vegetation limited GPR scan length, see pictures below.

FINDINGS

The subsurface conditions at the time of the scanning allowed for maximum GPR depth penetration of 4’ in most areas. The equipment and methods used did detect reactions from potential UST's. Possible UST detected north-west of property lot at approximate 2’-4’ in depth. The following pages will provide further explanation of the findings.

Page 3 of 6 ends

Prepared for: Stantec
Prepared By: Ivan Martinez
Date of Scanning: 2/19/21
Terms and Conditions
GPRS does not provide land survey or civil
engineering data collection or
documentation. This is provided as a
reference map of the field markings and is
not survey-grade.

LEGEND
225 Las Posas Road, San Marcos, CA
Prepared by:

Potential UST

Page 4 of 6 ends

Pink outline shows location of possible UST. Thick vegetation prevented GPR from scanning additional area.

Red brackets highlight anomaly detected in the field, potential UST.

GPR Data Screenshot and Photo 225 Las Posas Road, San Marcos, CA

Page 5 of 6 ends

Possible location of UST marked in pink. Fence and vegetation limited GPR scan length.

Red brackets highlight anomaly detected in the field, potential UST.

GPR Data Screenshot and Photo 225 Las Posas Road, San Marcos, CA

Page 6 of 6 ends

CLOSING
GPRS, Inc. has been in business since 2001, specializing in underground storage tank location, concrete scanning, utility locating, and shallow void detection for projects throughout the United States. I encourage you to visit our website (www.gprsinc.com) and contact any of the numerous references listed.

Possible UST detected north-west of property lot at approximate 2’-4’ in depth. Thick vegetation limited GPR scan length in the west-east direction.

The GPRS appreciates the opportunity to offer our services, and we look forward to continuing to work with you on future projects.

Please feel free to contact us for additional information or with any questions you may have regarding this report.

Signed,

Ivan Martinez
Project Manger—West Coast Region | LA/OC

Direct: 213.215.7183
[email protected]
www.gprsinc.com

PHASE II ENVIRONMENTAL SITE ASSESSMENT

APPENDIX B
Laboratory Data Sheets

March 09, 2021
735 E. Carnegie Drive, Suite 280
San Bernardino, CA 92408
Alicia Jansen
Tel: (909) 335-6116
Fax:(909) 335-6120
Stantec
ELAP No.: 1838
CSDLAC No.: 10196
ORELAP No.: CA300003
Re: ATL Work Order Number :

Client Reference :
2100475
Enclosed are the results for sample(s) received on March 02, 2021 by Advanced Technology Laboratories. The sample(s) are tested for the parameters as indicated on the enclosed chain of custody in accordance with applicable laboratory certifications. The laboratory results contained in this report specifically pertains to the sample(s) submitted.

Thank you for the opportunity to serve the needs of your company. If you have any questions, please feel free to contact me or your Project Manager.

Sincerely,
Laboratory Director
185805035, Olson - San Marcos
Edgar P. Caballero
3275 Walnut Avenue, Signal Hill, CA 90755 Tel: 562-989-4045 Fax: 562-989-4040 www.atlglobal.com
The cover letter and the case narrative are an integral part of this analytical report and its absence renders the report invalid.

Test results contained within this data package meet the requirements of applicable state-specific certification programs. The report cannot be reproduced without written permission from the client and Advanced Technology Laboratories.

Page 1 of 11 ends

735 E. Carnegie Drive, Suite 280
San Bernardino , CA 92408
Project Number :

Report To :
185805035, Olson - San Marcos
Alicia Jansen
Reported : 03/09/2021
Stantec
Certificate of Analysis
Sample ID Laboratory ID Matrix Date Sampled Date Received

SUMMARY O

F SAMPLES
S-1-1 2100475-01 Soil 3/01/21 10:05 3/02/21 1 1:05
S-2-1 2100475-04 Soil 3/01/21 10:40 3/02/21 1 1:05
3275 Walnut Avenue, Signal Hill, CA 90755 Tel: 562-989-4045 Fax: 562-989-4040 www.atlglobal.com Page 2 of 11 735 E. Carnegie Drive, Suite 280
San Bernardino , CA 92408
Project Number :

Report To :
185805035, Olson - San Marcos
Alicia Jansen
Reported : 03/09/2021
Stantec
Certificate of Analysis
Lab ID: 2100475-01
Client Sample ID: S-1-1
Notes
Date/Time
AnalyzedPreparedBatchDilutionAnalyte
Total Metals by ICP-AES EPA 6010B Analyst: AMP
Result
(mg/kg)(mg/kg)
PQL
1 B1C0052 03/04/2021 03/04/21 12:521.0NDArsenic
1 B1C0052 03/04/2021 03/04/21 12:521.04.8Lead
Notes
Date/Time
AnalyzedPreparedBatchDilutionAnalyte
Organochlorine Pesticides by EPA 8081A Analyst: AC
Result
(ug/kg)(ug/kg)
PQL
1 B1C0056 03/04/2021 03/05/21 10:522.0ND4,4´-DDD
1 B1C0056 03/04/2021 03/05/21 10:522.0ND4,4´-DDE
1 B1C0056 03/04/2021 03/05/21 10:522.0ND4,4´-DDT
1 B1C0056 03/04/2021 03/05/21 10:521.0NDAldrin
1 B1C0056 03/04/2021 03/05/21 10:521.0NDalpha-BHC
1 B1C0056 03/04/2021 03/05/21 10:521.0NDalpha-Chlordane 1 B1C0056 03/04/2021 03/05/21 10:521.0NDbeta-BHC
1 B1C0056 03/04/2021 03/05/21 10:528.5NDChlordane
1 B1C0056 03/04/2021 03/05/21 10:521.0NDdelta-BHC
1 B1C0056 03/04/2021 03/05/21 10:522.0NDDieldrin
1 B1C0056 03/04/2021 03/05/21 10:521.0NDEndosulfan I
1 B1C0056 03/04/2021 03/05/21 10:522.0NDEndosulfan II
1 B1C0056 03/04/2021 03/05/21 10:522.0NDEndosulfan sulfate 1 B1C0056 03/04/2021 03/05/21 10:522.0NDEndrin
1 B1C0056 03/04/2021 03/05/21 10:522.0NDEndrin aldehyde 1 B1C0056 03/04/2021 03/05/21 10:522.0NDEndrin ketone
1 B1C0056 03/04/2021 03/05/21 10:521.0NDgamma-BHC
1 B1C0056 03/04/2021 03/05/21 10:521.0NDgamma-Chlordane 1 B1C0056 03/04/2021 03/05/21 10:521.0NDHeptachlor
1 B1C0056 03/04/2021 03/05/21 10:521.0NDHeptachlor epoxide 1 B1C0056 03/04/2021 03/05/21 10:525.0NDMethoxychlor
1 B1C0056 03/04/2021 03/05/21 10:5250NDToxaphene
Surrogate: Decachlorobiphenyl 79.9 % 03/04/2021 03/05/21 10:52B1C00569 - 80 Surrogate: Tetrachloro-m-xylene 70.2 % 03/04/2021 03/05/21 10:52B1C005613 - 77 3275 Walnut Avenue, Signal Hill, CA 90755 Tel: 562-989-4045 Fax: 562-989-4040 www.atlglobal.com Page 3 of 11 735 E. Carnegie Drive, Suite 280
San Bernardino , CA 92408
Project Number :

Report To :
185805035, Olson - San Marcos
Alicia Jansen
Reported : 03/09/2021
Stantec
Certificate of Analysis
Lab ID: 2100475-04
Client Sample ID: S-2-1
Notes
Date/Time
AnalyzedPreparedBatchDilutionAnalyte
Total Metals by ICP-AES EPA 6010B Analyst: AMP
Result
(mg/kg)(mg/kg)
PQL
1 B1C0052 03/04/2021 03/04/21 12:571.0NDArsenic
1 B1C0052 03/04/2021 03/04/21 12:571.07.2Lead
Notes
Date/Time
AnalyzedPreparedBatchDilutionAnalyte
Organochlorine Pesticides by EPA 8081A Analyst: AC
Result
(ug/kg)(ug/kg)
PQL
1 B1C0056 03/04/2021 03/05/21 11:032.0ND4,4´-DDD
1 B1C0056 03/04/2021 03/05/21 11:032.0ND4,4´-DDE
1 B1C0056 03/04/2021 03/05/21 11:032.0ND4,4´-DDT
1 B1C0056 03/04/2021 03/05/21 11:031.0NDAldrin
1 B1C0056 03/04/2021 03/05/21 11:031.0NDalpha-BHC
1 B1C0056 03/04/2021 03/05/21 11:031.0NDalpha-Chlordane 1 B1C0056 03/04/2021 03/05/21 11:031.0NDbeta-BHC
1 B1C0056 03/04/2021 03/05/21 11:038.5NDChlordane
1 B1C0056 03/04/2021 03/05/21 11:031.0NDdelta-BHC
1 B1C0056 03/04/2021 03/05/21 11:032.0NDDieldrin
1 B1C0056 03/04/2021 03/05/21 11:031.0NDEndosulfan I
1 B1C0056 03/04/2021 03/05/21 11:032.0NDEndosulfan II
1 B1C0056 03/04/2021 03/05/21 11:032.0NDEndosulfan sulfate 1 B1C0056 03/04/2021 03/05/21 11:032.0NDEndrin
1 B1C0056 03/04/2021 03/05/21 11:032.0NDEndrin aldehyde 1 B1C0056 03/04/2021 03/05/21 11:032.0NDEndrin ketone
1 B1C0056 03/04/2021 03/05/21 11:031.0NDgamma-BHC
1 B1C0056 03/04/2021 03/05/21 11:031.0NDgamma-Chlordane 1 B1C0056 03/04/2021 03/05/21 11:031.01.4Heptachlor
1 B1C0056 03/04/2021 03/05/21 11:031.0NDHeptachlor epoxide 1 B1C0056 03/04/2021 03/05/21 11:035.0NDMethoxychlor
1 B1C0056 03/04/2021 03/05/21 11:0350NDToxaphene
Surrogate: Decachlorobiphenyl 76.5 % 03/04/2021 03/05/21 11:03B1C00569 - 80 Surrogate: Tetrachloro-m-xylene 68.4 % 03/04/2021 03/05/21 11:03B1C005613 - 77 3275 Walnut Avenue, Signal Hill, CA 90755 Tel: 562-989-4045 Fax: 562-989-4040 www.atlglobal.com Page 4 of 11 735 E. Carnegie Drive, Suite 280
San Bernardino , CA 92408
Project Number :

Report To :
185805035, Olson - San Marcos
Alicia Jansen
Reported : 03/09/2021
Stantec
Certificate of Analysis

QUALITY CONTROL SECTION
Total Metals by ICP-AES EPA 6010B - Quality Control
Analyte
Result PQL Spike
Level
Source
Result % Rec
% Rec
Limits RPD
RPD
Limit(mg/kg) (mg/kg) Notes
MDL
(mg/kg)
Batch B1C0052 - EPA 3050B_S
Blank (B1C0052-BLK1) Prepared: 3/4/2021 Analyzed: 3/4/2021 ND 1.0Arsenic 0.12
ND 1.0Lead 0.18
LCS (B1C0052-BS1) Prepared: 3/4/2021 Analyzed: 3/4/2021

23.6226 1.0 25.0000 94.5 80 - 120Arsenic 0.12

26.3536

1.0 25.0000 105 80 - 120Lead 0.18
Duplicate (B1C0052-DUP1) Source: 2100459-01 Prepared: 3/4/2021 Analyzed: 3/4/2021

5.28544 1.0 5.09308 3.71 20Arsenic 0.12

5.54896 1.0 5.64196 1.66 20Lead 0.18
Duplicate (B1C0052-DUP2) Source: 2100459-16 Prepared: 3/4/2021 Analyzed: 3/4/2021

3.00048 1.0 3.01202 0.384 20Arsenic 0.12

8.28652 1.0 8.33858 0.626 20Lead 0.18
Matrix Spike (B1C0052-MS1) Source: 2100459-01 Prepared: 3/4/2021 Analyzed: 3/4/2021

27.1461 1.0 25.0000

5.09308 88.2 55 - 117Arsenic 0.12

28.6712 1.0 25.0000 5.64196 92.1 26 - 161Lead 0.18
Matrix Spike (B1C0052-MS2) Source: 2100459-16 Prepared: 3/4/2021 Analyzed: 3/4/2021

20.6058 1.0 25.0000 3.01202 70.4 55 - 117Arsenic 0.12

25.0837 1.0 25.0000 8.33858 67.0 26 - 161Lead 0.18
Matrix Spike Dup (B1C0052-MSD1) Source: 2100459-01 Prepared: 3/4/2021 Analyzed: 3/4/2021

27.0570 1.0 25.0000 5.09308 87.9 55 - 117 0.329 20Arsenic 0.12

28.4768 1.0 25.0000

5.64196 91.3 26 - 161 0.680 20Lead 0.18
3275 Walnut Avenue, Signal Hill, CA 90755 Tel: 562-989-4045 Fax: 562-989-4040 www.atlglobal.com Page 5 of 11 735 E. Carnegie Drive, Suite 280
San Bernardino , CA 92408
Project Number :

Report To :
185805035, Olson - San Marcos
Alicia Jansen
Reported : 03/09/2021
Stantec
Certificate of Analysis
Organochlorine Pesticides by EPA 8081A - Quality Control Analyte
Result PQL Spike
Level
Source
Result % Rec
% Rec
Limits RPD
RPD
Limit(ug/kg) (ug/kg) Notes
MDL
(ug/kg)
Batch B1C0056 - GCSEMI_PCB/PEST_S
Blank (B1C0056-BLK1) Prepared: 3/4/2021 Analyzed: 3/5/2021 ND 2.04,4´-DDD 0.08
ND 2.04,4´-DDD [2C] 0.08
ND 2.04,4´-DDE 0.09
ND 2.04,4´-DDE [2C] 0.09
ND 2.04,4´-DDT 0.10
ND 2.04,4´-DDT [2C] 0.10
ND 1.0Aldrin 0.09
ND 1.0Aldrin [2C] 0.09
ND 1.0alpha-BHC 0.11
ND 1.0alpha-BHC [2C] 0.1
1 ND 1.0alpha-Chlordane 0.10
ND 1.0alpha-Chlordane [2C] 0.10
ND 1.0beta-BHC 0.15
ND 1.0beta-BHC [2C] 0.15
ND 8.5Chlordane 1.1
ND 8.5Chlordane [2C] 1.1
ND 1.0delta-BHC 0.11
ND 1.0delta-BHC [2C] 0.11
ND 2.0Dieldrin 0.09
ND 2.0Dieldrin [2C] 0.09
ND 1.0Endosulfan I 0.09
ND 1.0Endosulfan I [2C] 0.09
ND 2.0Endosulfan II 0.09
ND 2.0Endosulfan II [2C] 0.09
ND 2.0Endosulfan sulfate 0.11
ND 2.0Endosulfan Sulfate [2C] 0.11
ND 2.0Endrin 0.07
ND 2.0Endrin [2C] 0.07
ND 2.0Endrin aldehyde 0.18
ND 2.0Endrin aldehyde [2C] 0.18
ND 2.0Endrin ketone 0.06
ND 2.0Endrin ketone [2C] 0.06
ND 1.0gamma-BHC 0.12
ND 1.0gamma-BHC [2C] 0.12
ND 1.0gamma-Chlordane 0.11
ND 1.0gamma-Chlordane [2C] 0.11
ND 1.0Heptachlor 0.10
ND 1.0Heptachlor [2C] 0.10
ND 1.0Heptachlor epoxide 0.09
ND 1.0Heptachlor epoxide [2C] 0.09
ND 5.0Methoxychlor 0.14
3275 Walnut Avenue, Signal Hill, CA 90755 Tel: 562-989-4045 Fax: 562-989-4040 www.atlglobal.com Page 6 of 11 735 E. Carnegie Drive, Suite 280
San Bernardino , CA 92408
Project Number :

Report To :
185805035, Olson - San Marcos
Alicia Jansen
Reported : 03/09/2021
Stantec
Certificate of Analysis
Analyte
Result PQL Spike
Level
Source
Result % Rec
% Rec
Limits RPD
RPD
Limit(ug/kg) (ug/kg) Notes
Organochlorine Pesticides by EPA 8081A - Quality Control (cont'd) MDL
(ug/kg)
Batch B1C0056 - GCSEMI_PCB/PEST_S (continued)
Blank (B1C0056-BLK1) - Continued Prepared: 3/4/2021 Analyzed: 3/5/2021 ND 5.0Methoxychlor [2C] 0.14
ND 50Toxaphene 3.6
ND 50Toxaphene [2C] 3.6

17.33 16.6667 104 9 - 80Sur
rogate: Decachlorobiphenyl S12

14.09 16.6667 84.6 5 - 74Surrogate: Decachlorobiphenyl [ S12

14.00 16.6667 84.0 13 - 77Surrogate: Tetrachloro-m-xylene S12

12.24 16.6667 73.5 14 - 79Surrogate: Tetrachloro-m-xylene LCS (B1C0056-BS1) Prepared: 3/4/2021 Analyzed: 3/5/2021

13.2785 2.0 16.6667 79.7 33 - 884,4´-DDD 0.08

12.0927 2.0 16.6667 72.6 29 - 1004,4´-DDD [2C] 0.08

14.1093 2.0 16.6667 84.7 35 - 874,4´-DDE 0.09

11.8755 2.0 16.6667 71.3 38 - 914,4´-DDE [2C] 0.09

14.7395 2.0 16.6667 88.4 41 - 944,4´-DDT 0.10

13.2905 2.0 16.6667 79.7 31 - 1104,4´-DDT [2C] 0.10

14.2087 1.0 16.6667 85.3 35 - 85 L3Aldrin 0.09

12.4015 1.0 16.6667 74.4 38 - 92Aldrin [2C] 0.09

14.2117 1.0 16.6667 85.3 37 - 86alpha-BHC 0.11

12.6410 1.0 16.6667 75.8 39 - 92alpha-BHC [2C] 0.11

16.6013 1.0 16.6667 99.6 36 - 97 L3alpha-Chlordane 0.10

14.2848 1.0 16.6667 85.7 44 - 102alpha-Chlordane [2C] 0.10

13.4835 1.0 16.6667 80.9 38 - 75 L3beta-BHC 0.15

12.0630 1.0 16.6667 72.4 39 - 85beta-BHC [2C] 0.15

14.8322 1.0 16.6667 89.0 35 - 90delta-BHC 0.11

13.4507 1.0 16.6667 80.7 37 - 98delta-BHC [2C] 0.11

14.8340 2.0 16.6667 89.0 37 - 87 L3Dieldrin 0.09

13.0352 2.0 16.6667 78.2 40 - 91Dieldrin [2C] 0.09

14.5038 1.0 16.6667 87.0 32 - 84 L3Endosulfan I 0.09

12.8375 1.0 16.6667 77.0 33 - 94Endosulfan I [2C] 0.09

15.9968 2.0 16.6667 96.0 40 - 90 L3Endosulfan II 0.09

13.4575 2.0 16.6667 80.7 33 - 109Endosulfan II [2C] 0.09

14.5735 2.0 16.6667 87.4 37 - 82 L3Endosulfan sulfate 0.11

12.2703 2.0 16.6667 73.6 29 - 95Endosulfan Sulfate [2C] 0.11

17.9922 2.0 16.6667 108 38 - 95 L3Endrin 0.07

13.7862 2.0 16.6667 82.7 36 - 106Endrin [2C] 0.07

15.6703 2.0 16.6667 94.0 44 - 88 L3Endrin aldehyde 0.18

13.7237 2.0 16.6667 82.3 33 - 107Endrin aldehyde [2C] 0.18

14.1745 2.0 16.6667 85.0 43 - 84 L3Endrin ketone 0.06

12.4187 2.0 16.6667 74.5 30 - 97Endrin ketone [2C] 0.06

14.6870 1.0 16.6667 88.1 40 - 88 L3gamma-BHC 0.12

13.5772 1.0 16.6667 81.5 41 - 95gamma-BHC [2C] 0.12
3275 Walnut Avenue, Signal Hill, CA 90755 Tel: 562-989-4045 Fax: 562-989-4040 www.atlglobal.com Page 7 of 11 735 E. Carnegie Drive, Suite 280
San Bernardino , CA 92408
Project Number :

Report To :
185805035, Olson - San Marcos
Alicia Jansen
Reported : 03/09/2021
Stantec
Certificate of Analysis
Analyte
Result PQL Spike
Level
Source
Result % Rec
% Rec
Limits RPD
RPD
Limit(ug/kg) (ug/kg) Notes
Organochlorine Pesticides by EPA 8081A - Quality Control (cont'd) MDL
(ug/kg)
Batch B1C0056 - GCSEMI_PCB/PEST_S (continued)
LCS (B1C0056-BS1) - Continued Prepared: 3/4/2021 Analyzed: 3/5/2021

16.6208 1.0 16.6667 99.7 40 - 86 L3gamma-Chlordane 0.1
1 13.4162 1.0 16.6667 80.5 41 - 96gamma-Chlordane [2C] 0.11

13.5527 1.0 16.6667 81.3 37 - 93Heptachlor 0.10

13.6170 1.0 16.6667 81.7 36 - 99Heptachlor [2C] 0.10

14.2343 1.0 16.6667 85.4 40 - 82 L3Heptachlor epoxide 0.09

12.7558 1.0 16.6667 76.5 42 - 88Heptachlor epoxide [2C] 0.09

15.1247 5.0 16.6667 90.7 43 - 96Methoxychlor 0.14

13.4747 5.0 16.6667 80.8 32 - 108Methoxychlor [2C] 0.14

14.38 16.6667 86.3 9 - 80Surrogate: Decachlorobiphenyl S12

11.88 16.6667 71.3 5 - 74Surrogate: Decachlorobiphenyl [

11.50 16.6667 69.0 13 - 77Surrogate: Tetrachloro-m-xylene

10.23 16.6667 61.4 14 - 79Surrogate: Tetrachloro-m-xylene LCS Dup (B1C0056-BSD1) Prepared: 3/4/2021 Analyzed: 3/5/2021

13.9275 2.0 16.6667 83.6 33 - 88 4.77 204,4´-DDD 0.08

13.9353 2.0 16.6667 83.6 29 - 100 14.2 204,4´-DDD [2C] 0.08

14.8860 2.0 16.6667 89.3 35 - 87 5.36 20 L34,4´-DDE 0.09

13.6267 2.0 16.6667 81.8 38 - 91 13.7 204,4´-DDE [2C] 0.09

15.3805 2.0 16.6667 92.3 41 - 94 4.26 204,4´-DDT 0.10

15.3082 2.0 16.6667 91.8 31 -
110 14.1 204,4´-DDT [2C] 0.10

14.5072 1.0 16.6667 87.0 35 - 85 2.08 20 L3Aldrin 0.09

14.2853 1.0 16.6667 85.7 38 - 92 14.1 20Aldrin [2C] 0.09

15.1353 1.0 16.6667 90.8 37 - 86 6.29 20 L3alpha-BHC 0.11

14.6060

1.0 16.6667 87.6 39 - 92 14.4 20alpha-BHC [2C] 0.11

17.1085

1.0 16.6667 103 36 - 97 3.01 20 L3alpha-Chlordane 0.10

16.3540 1.0 16.6667 98.1 44 - 102 13.5 20alpha-Chlordane [2C] 0.10

14.0968 1.0 16.6667 84.6 38 - 75 4.45 20 L3beta-BHC 0.15

13.8093 1.0 16.6667 82.9 39 - 85 13.5 20beta-BHC [2C] 0.15

15.4902 1.0 16.6667 92.9 35 - 90 4.34 20 L3delta-BHC 0.11

15.4548

1.0 16.6667 92.7 37 - 98 13.9 20delta-BHC [2C] 0.11

15.4780

2.0 16.6667 92.9 37 - 87 4.25 20 L3Dieldrin 0.09

14.9978 2.0 16.6667 90.0 40 - 91 14.0 20Dieldrin [2C] 0.09

15.0365 1.0 16.6667 90.2 32 - 84 3.61 20 L3Endosulfan I 0.09

14.8067 1.0 16.6667 88.8 33 - 94 14.2 20Endosulfan I [2C] 0.09

16.3857 2.0 16.6667 98.3 40 - 90 2.40 20 L3Endosulfan II 0.09

15.4722 2.0 16.6667 92.8 33 - 109 13.9 20Endosulfan II [2C] 0.09

14.9108 2.0 16.6667 89.5 37 - 82 2.29 20 L3Endosulfan sulfate 0.11

14.1350

2.0 16.6667 84.8 29 - 95 14.1 20Endosulfan Sulfate [2C] 0.11

18.3477

2.0 16.6667 110 38 - 95 1.96 20 L3Endrin 0.07

15.5763 2.0 16.6667 93.5 36 - 106 12.2 20Endrin [2C] 0.07

16.4180 2.0 16.6667 98.5 44 - 88 4.66 20 L3Endrin aldehyde 0.18 3275 Walnut Avenue, Signal Hill, CA 90755 Tel: 562-989-4045 Fax: 562-989-4040 www.atlglobal.com Page 8 of 11 735 E. Carnegie Drive, Suite 280
San Bernardino , CA 92408
Project Number :

Report To :
185805035, Olson - San Marcos
Alicia Jansen
Reported : 03/09/2021
Stantec
Certificate of Analysis
Analyte
Result PQL Spike
Level
Source
Result % Rec
% Rec
Limits RPD
RPD
Limit(ug/kg) (ug/kg) Notes
Organochlorine Pesticides by EPA 8081A - Quality Control (cont'd) MDL
(ug/kg)
Batch B1C0056 - GCSEMI_PCB/PEST_S (continued)
LCS Dup (B1C0056-BSD1) - Continued Prepared: 3/4/2021 Analyzed: 3/5/2021

15.9552 2.0 16.6667 95.7 33 - 107 15.0 20Endrin aldehyde [2C] 0.18

14.7405 2.0 16.6667 88.4 43 - 84 3.91 20 L3Endrin ketone 0.06

14.4113

2.0 16.6667 86.5 30 - 97 14.9 20Endrin ketone [2C] 0.06

15.5443 1.0 16.6667 93.3 40 - 88 5.67 20 L3gamma-BHC 0.12

15.7455 1.0 16.6667 94.5 41 - 95 14.8 20gamma-BHC [2C] 0.12

16.6672 1.0 16.6667 100 40 - 86 0.278 20 L3gamma-Chlordane 0.11

15.4060

1.0 16.6667 92.4 41 - 96 13.8 20gamma-Chlordane [2C] 0.11

14.3153

1.0 16.6667 85.9 37 - 93 5.47 20Heptachlor 0.10

15.7093 1.0 16.6667 94.3 36 - 99 14.3 20Heptachlor [2C] 0.10

14.9187 1.0 16.6667 89.5 40 - 82 4.69 20 L3Heptachlor epoxide 0.09

14.7078 1.0 16.6667 88.2 42 - 88 14.2 20 L3Heptachlor epoxide [2C] 0.09

15.8030 5.0 16.6667 94.8 43 - 96 4.39 20Methoxychlor 0.14

15.4433 5.0 16.6667 92.7 32 - 108 13.6 20Methoxychlor [2C] 0.14

15.01 16.6667 90.1 9 - 80Sur
rogate: Decachlorobiphenyl S12

13.41 16.6667 80.5 5 - 74Surrogate: Decachlorobiphenyl [ S12

12.02 16.6667 72.1 13 - 77Surrogate: Tetrachloro-m-xylene

11.73 16.6667 70.4 14 - 79Surrogate: Tetrachloro-m-xylene 3275 Walnut Avenue, Signal Hill, CA 90755 Tel: 562-989-4045 Fax: 562-989-4040 www.atlglobal.com Page 9 of 11 735 E. Carnegie Drive, Suite 280
San Bernardino , CA 92408
Project Number :

Report To :
185805035, Olson - San Marcos
Alicia Jansen
Reported : 03/09/2021
Stantec
Certificate of Analysis
Notes and Definitions
S12 Surrogate recovery outside in-house established limit but within method default criteria.

L3 Laboratory control sample outside in-house established limits but within method criteria.

ND Analyte is not detected at or above the Practical Quantitation Limit (PQL). When client requests quantitation against MDL, analyte is not detected at or above the Method Detection Limit (MDL) PQL Practical Quantitation Limit
MDL Method Detection Limit
RPD Relative Percent Difference
Not ReportedNR
CA2 CA- ELAP (CDPH)
OR-NELAP (OSPHL)OR1
Notes:
(1) The reported MDL and PQL are based on prep ratio variation and analytical dilution. (2) The suffix [2C] of specific analytes signifies that the reported result is taken from the instrument's second column. (3) Results are wet unless otherwise specified.
3275 Walnut Avenue, Signal Hill, CA 90755 Tel: 562-989-4045 Fax: 562-989-4040 www.atlglobal.com Page 10 of 11

Page 11 of 11 ends

Stantec - San Bernardino
San Bernardino, CA
92408
735 E Carnegie Dr., Ste 280
Alicia Jansen
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 04-Mar-21 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,
15 March 2021
Lisa Eminhizer
Laboratory Director
H&P Mobile Geochemistry, Inc. is certified under the California ELAP and the National Environmental Laboratory Accreditation Conference (NELAC) for the fields of proficiency and analytes listed on those certificates. H& P is approved as an Environmental Testing Laboratory in accordance with the DoD-ELAP Program and ISO/IEC 17025:2005 programs for the fields of proficiency and analytes included in the certification process and to the extent offered by the accreditation agency . Unless otherwise noted, accreditation certificate numbers, expiration of certificates, and scope of accreditation can be found at: www.handpmg.com/about/certifications. 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: 18585035 / San Marcos
H&P
Project: ST030421-11
Dear Alicia Jansen:

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, CA Quality. Accuracy. Experience.

Geochemistry Inc.

Mobile

Page 1 of 14 ends

Project:

Project Number:

Project Manager:

Reported:

Stantec - San Bernardino
735 E Carnegie Dr., Ste 280
ST030421-1
1 18585035 / San Marcos
Alicia JansenSan Bernardino, CA 92408 15-Mar-21 14:17
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
SV-1 E103017-01 Vapor 04-Mar-21 04-Mar-21
SV-1 Rep E103017-02 Vapor 04-Mar-21 04-Mar-21
SV-2 E103017-03 Vapor 04-Mar-21 04-Mar-21

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DETECTIONS SUMMARY
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E103017-01SV
-1
Notes
Reporting
Benzene 2.9 0.6 ug/m3 EPA TO-15
Toluene 8.4 3.1 ug/m3 EPA TO-15
m,p-Xylene 3.8 1.8 ug/m3 EPA TO-15
TPHv (C5 - C12) 150 100 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E103017-02SV-1 Rep
Notes
Reporting
Benzene 2.4 0.6 ug/m3 EPA TO-15
Toluene 8.8 3.1 ug/m3 EPA TO-15
m,p-Xylene 3.8 1.8 ug/m3 EPA TO-15
TPHv (C5 - C12) 120 100 ug/m3 EPA TO-15
Sample ID: Laboratory ID:

Analyte Result Limit Units Method
E103017-03SV-2
Notes
Reporting
Methylene chloride (Dichloromethane) 1.6 1.4 ug/m3 EPA TO-15 Carbon disulfide 1.4 1.3 ug/m3 EPA TO-15
Benzene 5.7 0.6 ug/m3 EPA TO-15
Trichloroethene 2.2 2.2 ug/m3 EPA TO-15
Toluene 11 3.1 ug/m3 EPA TO-15
m,p-Xylene 4.0 1.8 ug/m3 EPA TO-15
1,2,4-Trimethylbenzene 2.3 2.0 ug/m3 EPA TO-15
TPHv (C5 - C12) 360 100 ug/m3 EPA TO-15

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Reported:

Volatile Organic Compounds by EPA TO-15
H&P
Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
SV-1 (E103017-01) Vapor Sampled: 04-Mar-21 Received: 04-Mar-21 EP
A TO-1512-Mar-21 12-Mar-21ug/m3 EC1120411,1-Difluoroethane (LCC) 2.2ND "" "" ""Dichlorodifluoromethane (F12) 4.0ND
"" "" ""Chloromethane 0.8ND
"" "" ""Dichlorotetrafluoroethane (F114) 2.8ND
"" "" ""Vinyl chloride 0.5ND
"" "" ""Bromomethane 1.6ND
"" "" ""Chloroethane 1.1ND
"" "" ""Trichlorofluoromethane (F11) 2.3ND
"" "" ""1,1-Dichloroethene 1.6ND
"" "" ""1,1,2-Trichlorotrifluoroethane (F113) 3.1ND
"" "" ""Methylene chloride (Dichloromethane) 1.4ND
"" "" ""Carbon disulfide 1.3ND
"" "" ""trans-1,2-Dichloroethene 1.6ND
"" "" ""1,1-Dichloroethane 1.6ND
"" "" ""2-Butanone (MEK) 2.4ND
"" "" ""cis-1,2-Dichloroethene 1.6ND
"" "" ""Chloroform 1.0ND
"" "" ""1,1,1-Trichloroethane 2.2ND
"" "" ""1,2-Dichloroethane (EDC) 1.6ND
" " "" "Benzene "0.62.9
"" "" ""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) 3.3ND
"" "" ""trans-1,3-Dichloropropene 1.8ND
" " "" "Toluene "3.18.4
"" "" ""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 1.8ND
" " "" "m,p-Xylene "1.83.8
"" "" ""Styrene 1.7ND

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Reported:

Volatile Organic Compounds by EPA TO-15
H&P
Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
SV-1 (E103017-01) Vapor Sampled: 04-Mar-21 Received: 04-Mar-21 EP
A TO-1512-Mar-21 12-Mar-21ug/m3 EC112041o-Xylene 1.8ND
"" "" ""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
" " " "97.0 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "97.6 % 78-125Surrogate: Toluene-d8
" " " "84.8 % 77-127Surrogate: 4-Bromofluorobenzene
SV-1 Rep (E103017-02) Vapor Sampled: 04-Mar-21 Received: 04-Mar-21 EPA TO-1512-Mar-21 12-Mar-21ug/m3 EC1120411,1-Difluoroethane (LCC) 2.2ND "" "" ""Dichlorodifluoromethane (F12) 4.0ND
"" "" ""Chloromethane 0.8ND
"" "" ""Dichlorotetrafluoroethane (F114) 2.8ND
"" "" ""Vinyl chloride 0.5ND
"" "" ""Bromomethane 1.6ND
"" "" ""Chloroethane 1.1ND
"" "" ""Trichlorofluoromethane (F11) 2.3ND
"" "" ""1,1-Dichloroethene 1.6ND
"" "" ""1,1,2-Trichlorotrifluoroethane (F113) 3.1ND
"" "" ""Methylene chloride (Dichloromethane) 1.4ND
"" "" ""Carbon disulfide 1.3ND
"" "" ""trans-1,2-Dichloroethene 1.6ND
"" "" ""1,1-Dichloroethane 1.6ND
"" "" ""2-Butanone (MEK) 2.4ND
"" "" ""cis-1,2-Dichloroethene 1.6ND
"" "" ""Chloroform 1.0ND
"" "" ""1,1,1-Trichloroethane 2.2ND
"" "" ""1,2-Dichloroethane (EDC) 1.6ND
" " "" "Benzene "0.62.4
"" "" ""Carbon tetrachloride 1.3ND

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Volatile Organic Compounds by EPA TO-15
H&P
Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
SV-1 Rep (E103017-02) Vapor Sampled: 04-Mar-21 Received: 04-Mar-21 EP
A TO-1512-Mar-21 12-Mar-21ug/m3 EC112041Trichloroethene 2.2ND "" "" ""1,2-Dichloropropane 1.9ND
"" "" ""Bromodichloromethane 2.7ND
"" "" ""cis-1,3-Dichloropropene 1.8ND
"" "" ""4-Methyl-2-pentanone (MIBK) 3.3ND
"" "" ""trans-1,3-Dichloropropene 1.8ND
" " "" "Toluene "3.18.8
"" "" ""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 1.8ND
" " "" "m,p-Xylene "1.83.8
"" "" ""Styrene 1.7ND
"" "" ""o-Xylene 1.8ND
"" "" ""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
" " " "96.0 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "99.0 % 78-125Surrogate: Toluene-d8
" " " "85.0 % 77-127Surrogate: 4-Bromofluorobenzene

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Volatile Organic Compounds by EPA TO-15
H&P
Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
SV-2 (E103017-03) Vapor Sampled: 04-Mar-21 Received: 04-Mar-21 EP
A TO-1512-Mar-21 12-Mar-21ug/m3 EC1120411,1-Difluoroethane (LCC) 2.2ND "" "" ""Dichlorodifluoromethane (F12) 4.0ND
"" "" ""Chloromethane 0.8ND
"" "" ""Dichlorotetrafluoroethane (F114) 2.8ND
"" "" ""Vinyl chloride 0.5ND
"" "" ""Bromomethane 1.6ND
"" "" ""Chloroethane 1.1ND
"" "" ""Trichlorofluoromethane (F11) 2.3ND
"" "" ""1,1-Dichloroethene 1.6ND
"" "" ""1,1,2-Trichlorotrifluoroethane (F113) 3.1ND
" " "" "Methylene chloride (Dichloromethane) "1.41.6
" " "" "Carbon disulfide "1.31.4
"" "" ""trans-1,2-Dichloroethene 1.6ND
"" "" ""1,1-Dichloroethane 1.6ND
"" "" ""2-Butanone (MEK) 2.4ND
"" "" ""cis-1,2-Dichloroethene 1.6ND
"" "" ""Chloroform 1.0ND
"" "" ""1,1,1-Trichloroethane 2.2ND
"" "" ""1,2-Dichloroethane (EDC) 1.6ND
" " "" "Benzene "0.65.7
"" "" ""Carbon tetrachloride 1.3ND
" " "" "Trichloroethene "2.22.2
"" "" ""1,2-Dichloropropane 1.9ND
"" "" ""Bromodichloromethane 2.7ND
"" "" ""cis-1,3-Dichloropropene 1.8ND
"" "" ""4-Methyl-2-pentanone (MIBK) 3.3ND
"" "" ""trans-1,3-Dichloropropene 1.8ND
" " "" "Toluene "3.111
"" "" ""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 1.8ND
" " "" "m,p-Xylene "1.84.0
"" "" ""Styrene 1.7ND

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Volatile Organic Compounds by EPA TO-15
H&P
Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
SV-2 (E103017-03) Vapor Sampled: 04-Mar-21 Received: 04-Mar-21 EP
A TO-1512-Mar-21 12-Mar-21ug/m3 EC112041o-Xylene 1.8ND
"" "" ""Bromoform 4.2ND
"" "" ""1,1,2,2-Tetrachloroethane 2.8ND
"" "" ""4-Ethyltoluene 2.0ND
"" "" ""1,3,5-Trimethylbenzene 2.0ND
" " "" "1,2,4-Trimethylbenzene "2.02.3
"" "" ""1,3-Dichlorobenzene 2.4ND
"" "" ""1,4-Dichlorobenzene 2.4ND
"" "" ""1,2-Dichlorobenzene 2.4ND
"" "" ""1,2,4-Trichlorobenzene 7.5ND
"" "" ""Hexachlorobutadiene 11ND
" " " "95.9 % 76-134Surrogate: 1,2-Dichloroethane-d4
" " " "99.0 % 78-125Surrogate: Toluene-d8
" " " "83.4 % 77-127Surrogate: 4-Bromofluorobenzene

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Reported:

Petroleum Hydrocarbon Analysis by EPA TO-15
H&P
Mobile Geochemistry, Inc.

Result Analyte Limit
Reporting
Units
Dilution
Batch Prepared Analyzed Method Notes Factor
SV-1 (E103017-01) Vapor Sampled: 04-Mar-21 Received: 04-Mar-21 EC1
1204 12-Mar-21 12-Mar-21ug/m3 1TPHv (C5 - C12) EPA TO-15100150 SV-1 Rep (E103017-02) Vapor Sampled: 04-Mar-21 Received: 04-Mar-21 EC11204 12-Mar-21 12-Mar-21ug/m3 1TPHv (C5 - C12) EPA TO-15100120 SV-2 (E103017-03) Vapor Sampled: 04-Mar-21 Received: 04-Mar-21 EC11204 12-Mar-21 12-Mar-21ug/m3 1TPHv (C5 - C12) EPA TO-15100360

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Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Limit Notes Analyte
V
olatile Organic Compounds by EPA TO-15 - Quality Control H&P Mobile Geochemistry, Inc.

Batch EC11204 - TO-15
Blank (EC11204-BLK1) Prepared & Analyzed: 12-Mar-21
1,1-Difluoroethane (LCC) ug/m32.2ND
Dichlorodifluoromethane (F12) "4.0ND
Chloromethane "0.8ND
Dichlorotetrafluoroethane (F114) "2.8ND
Vinyl chloride "0.5ND
Bromomethane "1.6ND
Chloroethane "1.1ND
Trichlorofluoromethane (F11) "2.3ND
1,1-Dichloroethene "1.6ND
1,1,2-Trichlorotrifluoroethane (F113) "3.1ND
Methylene chloride (Dichloromethane) "1.4ND
Carbon disulfide "1.3ND
trans-1,2-Dichloroethene "1.6ND
1,1-Dichloroethane "1.6ND
2-Butanone (MEK) "2.4ND
cis-1,2-Dichloroethene "1.6ND
Chloroform "1.0ND
1,1,1-Trichloroethane "2.2ND
1,2-Dichloroethane (EDC) "1.6ND
Benzene "0.6ND
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) "3.3ND
trans-1,3-Dichloropropene "1.8ND
Toluene "3.1ND
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

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Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Limit Notes Analyte
V
olatile Organic Compounds by EPA TO-15 - Quality Control H&P Mobile Geochemistry, Inc.

Batch EC11204 - TO-15
Blank (EC11204-BLK1) Prepared & Analyzed: 12-Mar-21
Chlorobenzene ug/m31.9ND
Ethylbenzene "1.8ND
m,p-Xylene "1.8ND
Styrene "1.7ND
o-Xylene "1.8ND
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
" 214 76-134Surrogate: 1,2-Dichloroethane-d4 95.1203
" 208 78-125Surrogate: Toluene-d8 98.0204
" 363 77-127Surrogate: 4-Bromofluorobenzene 82.1298
LCS (EC11204-BS1) Prepared & Analyzed: 12-Mar-21
Dichlorodifluoromethane (F12) ug/m3 101 59-12888.74.089 Vinyl chloride " 52.0 64-12788.90.546
Chloroethane " 53.6 63-12790.11.148
Trichlorofluoromethane (F11) " 113 62-12683.82.395
1,1-Dichloroethene " 80.8 61-13391.21.674
1,1,2-Trichlorotrifluoroethane (F113) " 155 66-12682.13.1130 Methylene chloride (Dichloromethane) " 70.8 62-11577.11.455 trans-1,2-Dichloroethene " 80.8 67-12486.31.670
1,1-Dichloroethane " 82.4 68-12683.51.669
cis-1,2-Dichloroethene " 80.0 70-12189.61.672
Chloroform " 99.2 68-12385.81.085
1,1,1-Trichloroethane " 111 68-12589.92.2100
1,2-Dichloroethane (EDC) " 82.4 65-12888.81.673

Page 11 of 14 ends

Project:

Project Number:

Project Manager:

Reported:

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Limit Notes Analyte
V
olatile Organic Compounds by EPA TO-15 - Quality Control H&P Mobile Geochemistry, Inc.

Batch EC11204 - TO-15
LCS (EC11204-BS1) Prepared & Analyzed: 12-Mar-21
Benzene ug/m3 64.8 69-11983.70.654
Carbon tetrachloride " 128 68-13290.61.3120
Trichloroethene " 110 71-12394.22.2100
Toluene " 76.8 66-11994.23.172
1,1,2-Trichloroethane " 111 73-11987.82.298
Tetrachloroethene " 138 66-1241212.8170
1,1,1,2-Tetrachloroethane " 140 67-1291012.8140
Ethylbenzene " 88.4 70-12496.91.886
m,p-Xylene " 88.4 61-13497.91.887
o-Xylene " 88.4 67-12594.21.883
1,1,2,2-Tetrachloroethane " 140 65-12779.32.8110
" 214 76-134Surrogate: 1,2-Dichloroethane-d4 97.7209
" 208 78-125Surrogate: Toluene-d8 95.6199
" 363 77-127Surrogate: 4-Bromofluorobenzene 89.0323

Page 12 of 14 ends

Project:

Project Number:

Project Manager:

Reported:

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Limit Notes Analyte
Petr
oleum Hydrocarbon Analysis by EPA TO-15 - Quality Control H&P Mobile Geochemistry, Inc.

Batch EC11204 - TO-15
Blank (EC11204-BLK1) Prepared & Analyzed: 12-Mar-21
TPHv (C5 - C12) ug/m3100ND

Page 13 of 14 ends

Project:

Project Number:

Project Manager:

Reported:

Notes and Definitions
Percent Recovery
Relative Percent Dif
ferenceRPD
%REC
Method Detection LimitMDL
Analyte NOT DETECTED at or above the reporting limitND
Leak Check CompoundLCC
Appendix
H&P Mobile Geochemistry, Inc. is approved as an Environmental Testing Laboratory and Mobile Laboratory in accordance with the DoD -ELAP Program and ISO/IEC 17025:2005 programs through PJLA, accreditation number 69070 for EPA Method TO-15, EPA Method 8260B and H&P 8260SV.

H&P is approved by the State of California as an Environmental Laboratory and Mobile Laboratory in conformance with the Environmental Laboratory Accreditation Program (ELAP) for the category of V olatile and Semi-V olatile Organic Chemistry of Hazardous Waste, certification numbers 2740, 2741, 2743 & 2745.

H&P is approved by the State of Louisiana Department of Environmental Quality under the National Environmental Laboratory Accreditation Conference (NELAC) certification number 04138
The complete list of stationary and mobile laboratory certifications along with the fields of testing (FOTs) and analyte lists are available at www.handpmg.com/about/certifications.

All soil results are reported in wet weight.

Page 14 of 14 ends

Mobile
Geochemistry, Inc.
2470 Impala Drive, Carlsbad, CA 92010
& Field Office - Signal Hill, CA
W handpmg.com E [email protected]
P 760.804.9678 F 760.804.9159
VAPOR / AIR Chain of Custody DATE: f 1 2-(
Page _4_0_1_
Lab Client and Project Information Sample Receipt (Lab Use Only) Lab Client/Consultant: k- k,_ L- Project Name / #: re...),S-b ib 3 5— Date Rec'd: 5 / 4 t z_t Control #:31-D ityq .b 3 Lab Client Project Manager: i, 1 , ,
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Project Locticyj,s, 0, Los cl4t s.....s i c .,,,..... it.....tr.l. H&P Project # c" --0 50-( - 1l Lab Client Address: 4.3s- es arv\e„ ,,, f. 'Dr , c ,., ,,4,.._ 2..sro Report E-Mail(s):
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C` G. a --S I-N• as -fx. ,- (-..e..z., . c --- -
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1 Lab Work Order # E t 0 3° i 7
Lab Client City, State, Zip:s k, 1-1,eciv,_,_ ‘

1 4 jv
9 240 %/
/ Sample Intact: Yes ❑0 No El See Notes Below
Phone Number: Cit; _
19 SK - ? 3 -.2--
Receipt Gauge ID: 6 o & Temp: p____--
Reporting Requirements Turnaround Time Sampler Information 1 Outside Lab:

X-[ Standard Report ❑ Level III E Level IV
❑ Excel EDD ❑ Other EDD:
l',KStandard
report.
❑Rush
(7 days for preliminary
10 days for final report)
(specify):

Sa m p I e r(s):
-( 1. kfie LN) `) 1---
Receipt Notes/Tracking #:

Lab PM Initials: /03
Signature: • i
❑ CA Geotracker Global ID: Date: -s Lc / 2_ t
Additional Instructions to Laboratory:
* Preferred VOC units (please choose one): I L._ t2k..5 --146 bIS ❑ t.ug/L KAgirn 3 ❑ ppbv ❑ ppmv
VOCs Standard Full List
❑
8260SV TO-15
VOCs Short List / Project List
❑
8260SV ❑ TO-15
Oxygenates
❑
8260SV ❑ TO-15
Naphthalene
❑
8260SV ❑ TO-15
TPHv as Gas
❑
8260SVm FO-15m
Aromatic/Aliphatic Fractions
❑
8260SVm ❑ TO-15m
Leak Check Compound
$L DFA ❑ IPA ❑ He
Methane by EPA 8015m
Fixed Gases by ASTM D1945
❑
CO2 ❑ 02 ❑ N2
cb
'W
1 FIELD POINT
NAME
SAMPLE NAME (if applicable)
DATE
mm/dd/yy
TIME
24hr clock

SAMPLE TYPE
Indoor Air (IA), Ambient
Air (AA), Subslab (SS),
Soil vapor (SV)

CONTAINER

SIZE & TYPE
400mL/1L/6L
Summa, Tedlar,
Tube, etc.

CONTAINER
ID (#1#)
Lab use only:

Receipt Vac
,..5 V - 31t-ti 1-1 o ' l.o SV l-- 1 -0 'r' )C- --7
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5k/ - )"'"
,0,
Ci.t.S 7 1161 -2.41 )C.' )c
Approved/Relinquished^
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s\............„\9ilm_pc: Da : Time:
3 le2‘ 10 1 th
Received by: - ; 30 PA ........ Cc,m iany.....

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1 Dfttei (24 Tim •
10 t L. ( ,
Approved/Relinquished by: *--- Company: Date: Time: Received by: Company: Date: Time:

Approved/Relinquished by: Company: Date: Time: Received by: Company: Date: Time:
'Approval constitutes as authorization to proceed with analysis and acceptance of conditions on back Appendix 6A1, Rev 1/9/2019, Effective 1/21/2019

San Marcos City CouncilJune 24, 2025

San Marcos City Council
June 24, 2025