Information_Handout_-_Asbestos-Containing_Materials_and_Lead-Containing_Paint_Survey_Report.pdf

AUGUST 2026

PREPARED FOR:

PARIKH CONSULTANTS

1497 NORTH MILPITAS BOULEVARD

MILPITAS, CALIFORNIA 95035

PREPARED BY:

GEOCON CONSULTANTS, INC.

6671 BRISA STREET

LIVERMORE, CALIFORNIA 94550

GEOCON PROJECT NO. E9453-02-01

ASBESTOS-CONTAINING MATERIALS AND

LEAD-CONTAINING PAINT

SURVEY REPORT

State Route 50/Hazel Avenue Interchange Improvement Project

Sacramento, California

Project No. E9453-02-01 August 5, 2026

Parikh Consultants 1497 North Milpitas Boulevard Milpitas, California 95035

Attention: Gary Parikh

Subject: ASBESTOS-CONTAINING MATERIALS AND LEAD-CONTAINING PAINT SURVEY REPORT

STATE ROUTE 50/HAZEL AVENUE INTERCHANGE IMPROVEMENT PROJECT

ALDER CREEK BRIDGE SIDEWALL AND HAZEL AVENUE BRIDGE

SACRAMENTO, CALIFORNIA

Mr. Parikh:

In accordance with your authorization and on behalf of Mark Thomas and Company and County of Sacramento, Geocon Consultants, Inc. has performed an asbestos-containing materials and lead-containing paint survey in support of the State Route 50/Hazel Avenue Interchange Improvement Project. Our scope of services included surveying the structure for suspect asbestos-containing materials and lead- or chromium-containing paint, collecting bulk samples, and submitting the samples to laboratories for analyses.

The accompanying report summarizes the services performed and laboratory analysis.

The contents of this report reflect the views of Geocon Consultants, Inc., who are responsible for the facts and accuracy of the data presented herein. This report does not constitute a standard, specification, or regulation.

Please contact us if you have questions concerning the contents of this report or if we may be of further service.

Sincerely, Geocon Consultants, Inc.

Nicholas Rice, CAC No. 24-7578 Cord Dennig, CAC No. 21-6915 Project Scientist Senior Project Scientist

SR-50 / Hazel Avenue Interchange Improvement Project Asbestos-Containing Materials and Lead-Containing Paint Survey Report

TABLE OF CONTENTS

ASBESTOS-CONTAINING MATERIALS AND LEAD-CONTAINING PAINT SURVEY REPORT PAGE

1.0 INTRODUCTION

1.1 Project Description

1.2 General Objectives

2.0 BACKGROUND

2.1 Asbestos

2.2 Lead and Chromium

3.0 SCOPE OF SERVICES

3.1 Asbestos

3.2 Lead and Chromium

4.0 INVESTIGATIVE RESULTS

4.1 Asbestos

4.2 Lead Paint

4.2.1 Alder Creek Bridge Sidewall

4.2.2 Hazel Avenue Bridge

5.0 RECOMMENDATIONS

5.1 Asbestos

5.2 Lead Paint

5.2.1 Alder Creek Bridge Sidewall

5.2.2 Hazel Avenue Bridge

6.0 REPORT LIMITATIONS

FIGURES

1. Site Location Map

2. Site Plan - Alder Creek Bridge Sidewall

3. Site Plan - Hazel Avenue Bridge

PHOTOGRAPHS 1 through 8

TABLES

1. Summary of Laboratory Analytical Results – Asbestos

2. Summary of Laboratory Analytical Results – Paint

APPENDICES

A. Personnel Certifications B. Analytical Laboratory Reports and Chain-of-custody Documentation

SR-50/Hazel Avenue Interchange Improvement Project

Geocon Project Number E9453-02-01 1 - August 5, 2026

ASBESTOS-CONTAINING MATERIALS AND LEAD-CONTAINING PAINT

SURVEY REPORT

1.0 INTRODUCTION

We performed an asbestos-containing material (ACM), lead-containing paint (LCP), and chromium-containing paint (CCP) survey of the Alder Creek bridge sidewall along State Route 50 (SR-50) and the Hazel Avenue Bridge over SR-50 in support of the SR-50/Hazel Avenue Interchange Improvement Project for Parikh Consultants (Parikh) on behalf of Mark Thomas and Company and the County of Sacramento.

1.1 Project Description

We surveyed the Alder Creek Bridge sidewall and Hazel Avenue Bridge for suspect ACM, LCP, and CCP in Sacramento, California as requested by Mark Thomas. The project location is depicted on the Site Location Map (Figure 1), Site Plans (Figure 2 and Figure 3), and shown in the attached photographs.

1.2 General Objectives

The purpose of the scope of services was to determine the presence and quantity of asbestos, deteriorated LCP, and CCP at the bridge and wall structure prior to renovations. The information obtained from this investigation will be used by Mark Thomas and the City of Sacramento for waste profiling, determining Division of Occupational Safety and Health Administration (DOSH) also known as (Cal/OSHA) applicability, and coordinating asbestos and LCP disturbance activities.

It was not Geocon’s intent during this inspection to conduct an evaluation of lead-based paint hazards in accordance with U.S. Department of Housing and Urban Development (HUD) guidelines.

2.0 BACKGROUND

2.1 Asbestos

The Code of Federal Regulations (CFR), 40 CFR 61, Subpart M, National Emissions Standards for

Hazardous Air Pollutants (NESHAP) and Federal Occupational Safety and Health Administration (FED OSHA) classify asbestos-containing material (ACM) as any material or product that contains greater than 1% asbestos. Nonfriable ACM is classified by NESHAP as either Category I or Category II material defined as follows:

Geocon Project Number E9453-02-01 2 - August 5, 2026

Category I – asbestos-containing packings, gaskets, resilient floor coverings, and asphalt roofing products.

Category II – all remaining types of nonfriable asbestos-containing material not included in Category I that when dry, cannot be crumbled, pulverized, or reduced to powder by hand pressure.

Regulated asbestos-containing material (RACM), a California hazardous waste when friable, is classified as any manufactured material that contains greater than 1% asbestos by dry weight and is:

• Friable (can be crumbled, pulverized, or reduced to powder by hand pressure); or

• Category I material that has become friable; or

• Category I material that has been subjected to sanding, grinding, cutting, or abrading; or

• Category II nonfriable material that has a high probability of becoming crumbled, pulverized, or reduced to a powder during demolition or renovation activities.

Activities that disturb materials containing any amount of asbestos are subject to certain requirements of the Cal/OSHA asbestos standard contained in Title 8 of the California Code of Regulations (CCR) §1529. Typically, removal or disturbance of more than 100 square feet of material containing more than 0.1% asbestos must be performed by a registered asbestos abatement contractor, but associated waste labeling is not required if the material contains 1% or less asbestos. When the asbestos content of a material exceeds 1%, virtually all requirements of the standard become effective.

Materials containing more than 1% asbestos are also subject to NESHAP regulations (40 CFR Part 61, Subpart M). RACM (friable ACM and nonfriable ACM that will become friable during demolition operations) must be removed from structures prior to demolition. Certain nonfriable ACM and materials containing 1% or less asbestos may remain in structures during demolition; however, there are waste handling/disposal issues and Cal/OSHA work requirements that must be addressed.

Contractors are responsible for segregating and characterizing waste streams prior to disposal.

With respect to potential worker exposure, notification, and registration requirements, Cal/OSHA defines asbestos-containing construction material (ACCM) as construction material that contains more than 0.1% asbestos (Title 8, CCR 341.6).

2.2 Lead and Chromium

Construction activities (including demolition) that disturb materials or paints containing any amount of lead are subject to certain requirements of the Cal/OSHA lead standard contained in Title 8, CCR, Section 1532.1. Deteriorated paint is defined by Title 17, CCR, Division 1, Chapter 8, §35022 as a surface

Geocon Project Number E9453-02-01 3 - August 5, 2026 coating that is cracking, chalking, flaking, chipping, peeling, non-intact, failed, or otherwise separating from a substrate. Demolition of a deteriorated lead- and chromium-containing paint component would require waste characterization and appropriate disposal. Intact lead- and chromium-containing paint on a component is currently accepted by most landfills and recycling facilities; however, contractors are responsible for segregating and characterizing waste streams prior to disposal.

For a solid waste containing lead, the waste is classified as California hazardous when: 1) the total lead content equals or exceeds the respective Total Threshold Limit Concentration (TTLC) of 1,000 milligrams per kilogram (mg/kg); or 2) the soluble lead content equals or exceeds the respective

Soluble Threshold Limit Concentration (STLC) of 5 milligrams per liter (mg/l) based on the standard Waste Extraction Test (WET). The soluble lead concentration of a waste has the potential to exceed the lead STLC when the waste’s total lead concentration is greater than or equal to 10 times the respective STLC value since the WET uses a 1:10 dilution ratio. Hence, when total lead is detected at a concentration greater than or equal to 50 mg/kg, and assuming that 100 percent of the total lead is soluble, soluble lead analysis is required. Lead-containing waste is classified as “Resource, Conservation, and Recovery Act” (RCRA) hazardous, or Federal hazardous, when its soluble lead concentration equals or exceeds the Federal regulatory level of 5 mg/l based on the Toxicity Characteristic Leaching Procedure (TCLP).

For a solid waste containing chromium, the waste is classified as California hazardous when: 1) the total chromium content equals or exceeds the respective TTLC of 2,500 mg/kg; or 2) the soluble chromium content equals or exceeds the respective STLC of 5 mg/l based on the standard WET. The soluble chromium concentration of a waste has the potential to exceed the chromium STLC when the waste’s total chromium concentration is greater than or equal to 10 times the respective STLC value since the WET uses a 1:10 dilution ratio. Hence, when total chromium is detected at a concentration greater than or equal to 50 mg/kg, and assuming that 100 percent of the total chromium is soluble, soluble chromium analysis is required. Chromium-containing waste is classified as RCRA hazardous, or Federal hazardous, when its soluble chromium concentration equals or exceeds the Federal regulatory level of 5 mg/l based on the TCLP.

The above regulatory criteria are based on chemical concentrations. Wastes may also be classified as hazardous based on other criteria such as ignitability; however, for the purposes of this investigation, toxicity (i.e., lead concentrations) is the primary factor considered for waste classification since waste generated during the construction activities would not likely warrant testing for ignitability or other criteria. Waste that is classified as either California hazardous or RCRA hazardous requires management as a hazardous waste.

Geocon Project Number E9453-02-01 4 - August 5, 2026

Potential hazards exist to workers who remove or cut through LCP and chromium-containing paints and coatings during demolition. Dust containing hazardous concentrations of lead may be generated during scraping or cutting materials coated with lead- and chromium-containing paint. Torching of these materials may produce lead oxide fumes. Therefore, air monitoring and/or respiratory protection may be required during the disturbance of materials coated with lead- and chromium-containing paint.

Guidelines regarding regulatory provisions for construction work where workers may be exposed to lead are in Title 8, CCR, §1532.1.

3.0 SCOPE OF SERVICES

Nick Rice and Cord Dennig performed the survey on April 7, 2026. Mr. Rice is a California-Certified Asbestos Consultant (CAC), Certification Number 24-7578, and Certified Lead Paint Inspector/Assessor with the California Department of Public Health (CDPH), Certification Number LRC-13870. Cord Dennig reviewed this report. Mr. Dennig is a California-CAC, Certification Number 21-6915, and a Certified Lead Paint Inspector/Assessor and Certified Lead Paint Project Monitor with the CDPH, Certification Numbers LRC-2374 and LRC-12229. Copies of Messrs. Rice’s and Dennig’s Cal/OSHA CAC and CDPH certification cards are in Appendix A.

3.1 Asbestos

We grouped suspect ACM at the project location into homogeneous areas with representative samples randomly collected from each. In addition, we evaluated each potential ACM for friability. We collected 19 bulk samples representing eight suspect materials at the project locations.

Our procedures for inspection and sampling were as follows:

• Collected bulk asbestos samples after wetting friable materials with a light mist of water.

The samples were then removed from the substrate and transferred to labeled containers. Note that when we collected multiple samples, we distributed the sampling locations throughout the homogeneous area (spaces where the material was observed).

• Relinquished bulk asbestos samples under chain-of-custody protocol to EMSL Analytical, Inc.

(EMSL), a California-licensed subcontractor, for asbestos analysis in accordance with United States Environmental Protection Agency (EPA) Test Method 600/R-93/116 using polarized light microscopy (PLM). EMSL is a laboratory accredited by the National Institute of Standards and Technology National Voluntary Laboratory Accreditation Program (NVLAP) (NVLAP Certification Number 200232-0) for bulk asbestos fiber analysis. We requested the laboratory analyses on a one-week turnaround time.

Sample identification numbers, material descriptions, approximate quantities, friability assessments, and photo references are summarized in Table 1. Approximate sample locations are depicted on Figures 2 and 3. Materials represented by the samples collected are shown in the attached photographs.

Geocon Project Number E9453-02-01 5 - August 5, 2026

3.2 Lead and Chromium

We collected four bulk paint samples of suspect LCP and CCP observed at the project location. Our sampling procedures were as follows:

• Collected bulk samples of suspect LCP and CCP using techniques presented in HUD guidelines. In addition, we evaluated the painted areas for evidence of deterioration such as flaking or cracking.

• Relinquished the bulk samples under chain-of-custody protocol to Asset Laboratories (Asset), a California-licensed subcontractor, for total lead and chromium analysis in accordance with EPA Test Method 6010B. Additionally we requested that the paint samples be also analyzed for chromium in accordance with EPA Test Method 6010B. Asset is accredited by the California State Water Resources Control Board under the Environmental Laboratory Accreditation Program for lead and chromium analysis. We requested the laboratory analyses on a one-week turnaround time.

The sample identification numbers, descriptions, and photo references are summarized in Table 2. The approximate sample locations are depicted on Figures 2 and 3. Materials represented by the samples collected are shown in the attached photographs.

4.0 INVESTIGATIVE RESULTS

4.1 Asbestos

Asbestos was not observed in the samples of suspect materials collected during our survey of the Alder Creek sidewall or Hazel Avenue bridge structure. Analytical laboratory test results for asbestos are presented in Table 1. Copies of the laboratory report and chain-of-custody documentation are in Appendix B.

4.2 Lead Paint

4.2.1 Alder Creek Bridge Sidewall

Total lead was reported at a concentration of 3.5 mg/kg in a sample representing intact white traffic striping applied to the asphalt drive isle. Total chromium was reported at a concentration of 7.0 mg/kg in the same paint sample.

Total lead was not detected at a concentration at or exceeding the laboratory reporting limit (RL) of 5.0 mg/kg in a sample representing intact beige-gray graffiti abatement paint applied to bridge sidewall.

Total chromium was reported at a concentration of 14 mg/kg in the same paint sample.

Geocon Project Number E9453-02-01 6 - August 5, 2026

4.2.2 Hazel Avenue Bridge

Total lead was reported at a concentration of 6.6 mg/kg in a sample representing intact white traffic striping applied to the bridge deck. Total chromium was reported at a concentration of 2.5 mg/kg in the same paint sample.

Total lead was reported at a concentration of 17 mg/kg in a sample representing intact gray graffiti abatement paint applied to the bridge sidewalls. Total chromium was reported at a concentration of

110 mg/kg in the same paint sample, with a WET chromium concentration of 1.1 mg/l.

A summary of the analytical laboratory test results for paint is presented in Table 2. Copies of the laboratory reports and chain-of-custody documentation are in Appendix B.

5.0 RECOMMENDATIONS

Based on our findings, we recommend the following:

5.1 Asbestos

Since asbestos was not detected in samples of suspect material collected during our survey, the Cal/OSHA asbestos standard does not apply for planned activities involving materials sampled during our survey of the Alder Creek Bridge sidewall and Hazel Avenue bridge structure. In addition, construction debris would not be considered a California hazardous waste based on asbestos content.

Analytical laboratory test results for asbestos are presented in the report table. Copies of the laboratory report and chain-of-custody documentation are in Appendix B.

In accordance with NESHAP and Sacramento Metropolitan Air Quality Management District (SMAQMD), written notification to SMAQMD is required ten working days prior to commencement of any demolition activity (whether asbestos is present or not).

5.2 Lead Paint

Geocon recommends that all paints present at the site be considered hazardous based on lead content unless sampling and analytical testing by the paint removal contractor indicates otherwise. For the purpose of determining the applicability of the Cal/OSHA lead standard during maintenance, renovation, and demolition activities. This recommendation is based on LCP sample results and the fact that lead was a common ingredient of paints manufactured before 1978 and is still an ingredient of

Geocon Project Number E9453-02-01 7 - August 5, 2026 some paints. In accordance with Title 8, CCR, §1532.1(p), written notification to the nearest Cal/OSHA district office is required at least 24 hours prior to certain lead-related work. Compliance and training requirements regarding construction activities where workers may be exposed to lead are presented in Title 8, CCR, §1532.1, subsections I and (l), respectively. The removal, transportation, placement, handling, and disposal of LCP must result in no visible dust.

5.2.1 Alder Creek Bridge Sidewall

Intact white traffic striping applied to the asphalt drive isle and intact beige-gray paint applied to the sidewall would not be considered California or Federal (RCRA) hazardous waste based on lead or chromium content if stripped, blasted, or otherwise separated from the substrates.

5.2.2 Hazel Avenue Bridge

Intact white traffic striping applied to the bridge deck and intact gray paint applied to the sidewalls would not be considered California or Federal (RCRA) hazardous waste based on lead or chromium content if stripped, blasted, or otherwise separated from the substrates.

Geocon Project Number E9453-02-01 8 - August 5, 2026

6.0 REPORT LIMITATIONS

The asbestos and LCP survey was conducted in conformance with generally accepted standards of practice for identifying and evaluating asbestos and LCP in structures. The survey addressed only the structures identified in Section 1.1. Due to the nature of structure surveys, asbestos and LCP use, and laboratory analytical limitations, some ACM or LCP at the project location may not have been identified.

Spaces such as cavities, voids, crawlspaces, and pipe chases may have been concealed to our investigator. Previous renovation work may have concealed or covered spaces or materials or may have partially demolished materials and left debris in inaccessible areas. Additionally, renovation activities may have partially replaced ACM with indistinguishable non-ACM. Asbestos and/or LCP may exist in areas of the structures that were not accessible or sampled during this survey.

During renovation or demolition operations, suspect materials may be uncovered which are different from those accessible for sampling during this assessment. Personnel in charge of renovation/demolition should be alerted to note materials uncovered during such activities that differ substantially from those included in this or previous assessment reports. If suspect ACM and/or LCP are found, additional sampling and analysis should be performed to determine if the materials contain asbestos or lead.

This report has been prepared exclusively for Parikh, Mark Thomas, and the County of Sacramento. The information contained herein is only valid as of the date of the report and will require an update to reflect additional information obtained.

This report is not a comprehensive site characterization and should not be construed as such.

The findings as presented in this report are predicated on the results of the limited sampling and laboratory testing performed. In addition, the information obtained is not intended to address potential impacts related to sources other than those specified herein. Therefore, the report should be deemed conclusive with respect to only the information obtained. We make no warranty with respect to the content of this report or any subsequent reports, correspondence or consultation. Geocon strove to perform the services summarized herein in accordance with the local standard of care in the geographic region at the time the services were rendered.

The contents of this report reflect the views of the author who is responsible for the facts and accuracy of the data presented herein. This report does not constitute a standard, specification, or regulation.

FOLSOM

ORANGEVALE

Alder Creek Bridge (Br. No. 24-0033)

Prairie City Off Highway Vehicle Park

American River Parkway Sailor Bar Area

Folsom Lake State Recreation Area

Hazel Avenue Overcrossing (Br. No. 24-0168)

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Figure 1August 2026E9453-02-01

SITE LOCATION MAP

Sacramento California

State Route 50/Hazel Avenue Interchange

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Figure 2August 2026E9453-02-01

SITE PLAN - HAZEL AVENUE

Sacramento California

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Figure 3August 2026E9453-02-01

SITE PLAN - ALDER CREEK

Sacramento California

Photo 1 – Alder Creek Wall along Highway 50 in Sacramento, California; concrete.

Photo 2 – Alder Creek Wall; concrete, asphalt, white traffic striping and gray graffiti abatement paint.

Photo 3 – Hazel Avenue Bridge in Sacramento, California; asphalt, concrete, and white traffic striping.

PHOTOGRAPHS 1, 2, & 3

State Route 50 / Hazel Avenue Interchange Improvement Project

State Route 50 Sacramento County, California

E9453-02-01 August 2026

Photo 4 – Hazel Avenue Bridge; concrete, and gray graffiti abatement paint.

Photo 5 – Hazel Avenue Bridge; concrete, asphalt, rubber joint seal.

Photo 6 – Hazel Avenue Bridge; brown fibrous joint fill.

PHOTOGRAPHS 4, 5, & 6

State Route 50 / Hazel Avenue Interchange Improvement Project

State Route 50

Photo 7 – Hazel Avenue Bridge; concrete, and gray graffiti abatement paint.

Photo 8 – Hazel Avenue Bridge; concrete, asphalt, rubber joint seal.

PHOTOGRAPHS 7 & 8

State Route 50 / Hazel Avenue Interchange Improvement Project

State Route 50

TABLE 1

SUMMARY OF ANALYTICAL LABORATORY TEST RESULTS - ASBESTOS

STATE ROUTE 50/HAZEL AVENUE INTERCHANGE IMPROVEMENT PROJECT

Polarized Light Microscopy (PLM) - EPA Test Method 600/R-93/116

Sample Group Description of Suspect Material Approximate Quantity Friable Site Photos Asbestos Content

Alder Creek Wall AC-1A-1C Concrete NA NA 1 & 2 ND AC-2A/B Asphalt NA NA 2 ND

Hazel Avenue Bridge H-1A-1D Concrete NA NA 3 - 8 ND H-2A/B Asphalt NA NA 3 & 5 ND H-3A/B Rubber joint seal NA NA 5 ND H-4A/B Brown fibrous joint fill NA NA 6 ND H-5A/B Sheet bearing material NA NA 7 ND H-6A/B Rubber conduit jacket NA NA 8 ND

Notes:

EPA = Environmental Protection Agency NA = Not applicable (asbestos not detected) ND = No asbestos fibers detected

SACRAMENTO COUNTY, CALIFORNIA

Geocon Project No. E9453-02-01 1 of 1 August 2026

TABLE 2

SUMMARY OF ANALYTICAL LABORATORY TEST RESULTS - PAINT

LEAD AND CHROMIUM

STATE ROUTE 50/HAZEL AVENUE INTERCHANGE IMPROVEMENT PROJECT

SACRAMENTO COUNTY, CALIFORNIA

Total and Soluble Lead and Chromium (EPA Test Method 6010B)

Sample No. Paint Description Approximate Quantity Peeling/Flaking Site Photo Total Lead

(mg/kg)

Total Chromium

(mg/kg)

WET

Chromium

(mg/l) Alder Creek Wall

AC-P1 White traffic striping Intact 2 3.5 7.0 --- AC-P2 Beige-gray graffiti abatement paint Intact 2 <5.0 14 ---

Hazel Avenue Bridge H-P1 White traffic striping Intact 3 & 5 6.6 2.5 --- H-P2 Gray graffiti abatement paint Intact 4 17 110 1.1

Notes:

mg/kg = milligrams per kilogram

EPA = Environmental Protection Agency WET = Waste Extraction Test mg/l = milligrams per liter

Geocon Project No. E9369-02-64 1 of 1 August 2026

APPENDIX A

STATE OF CALIFORNIA

DEPARTMENT OF PUBLIC HEALTH

LEAD-RELATED CONSTRUCTION CERTIFICATE

Disclaimer: This document alone should not be relied upon to confirm certification status. Compare the individual’s photo and name to another valid form of government issued photo identification. Verify the individual’s certification status by searching for Lead-Related Construction Professionals at www.cdph.ca.gov/programs/clppb or calling (800) 597-LEAD

INDIVIDUAL: CERTIFICATE TYPE: NUMBER: EXPIRATION DATE:

Lead Inspector/Assessor LRC-00002374 2/15/2027

Lead Project Monitor LRC-00012229 1/3/2027

Cord Dennig

APPENDIX B

LA Testing 520 Mission Street South Pasadena, CA 91030

Tel/Fax: (323) 254-9960 / (323) 254-9982 http://www.LATesting.com / pasadenalab@latesting.com

322608663LA Testing Order:

Customer ID: GECN21

Customer PO: E9453-02-01

Project ID:

Attention: Phone:Nick Rice (775) 685-6116

Fax:Geocon Consultants, Inc. (925) 371-5915

Received Date:6671 Brisa Street 04/07/2026 11:45 AM

Analysis Date:Livermore, CA 94550 04/15/2026

Collected Date:

Project: E9453-02-01 US-50/Hazel Avenue Bridges

Test Report: Asbestos Analysis of Bulk Materials via AHERA Method 40CFR 763 Subpart E

Appendix E supplemented with EPA 600/R-93/116 using Polarized Light Microscopy

Sample Description Appearance % Fibrous % Non-Fibrous

Non-Asbestos Asbestos

% Type

H-1A

322608663-0001

None DetectedNon-fibrous (Other)100%Gray

Non-Fibrous

Homogeneous

Concrete

H-1B

322608663-0002

None DetectedNon-fibrous (Other)100%Gray

Non-Fibrous

Homogeneous

Concrete

H-1C

322608663-0003

None DetectedNon-fibrous (Other)100%Gray

Non-Fibrous

Homogeneous

Concrete

H-1D

322608663-0004

None DetectedNon-fibrous (Other)100%Gray

Non-Fibrous

Homogeneous

Concrete

H-2A

322608663-0005

None DetectedNon-fibrous (Other)100%Gray/Black

Non-Fibrous

Homogeneous

Asphalt

H-2B

322608663-0006

None DetectedNon-fibrous (Other)100%Black

Non-Fibrous

Homogeneous

Asphalt

H-3A

322608663-0007

None DetectedNon-fibrous (Other)100%Black

Non-Fibrous

Homogeneous

Rubber Joint Seal

H-3B

322608663-0008

None DetectedNon-fibrous (Other)100%Black

Non-Fibrous

Homogeneous

Rubber Joint Seal

H-4A

322608663-0009

None DetectedNon-fibrous (Other)65%Cellulose35%Black

Fibrous

Homogeneous

Brown Fibrous Joint

Fill

H-4B

322608663-0010

None DetectedNon-fibrous (Other)100%Black

Non-Fibrous

Homogeneous

Brown Fibrous Joint

Fill

H-5A

322608663-0011

None DetectedNon-fibrous (Other)5%Cellulose95%Brown

Fibrous

Homogeneous

Sheet Bearing

Material

H-5B

322608663-0012

None DetectedNon-fibrous (Other)5%Cellulose95%Brown

Non-Fibrous

Homogeneous

Sheet Bearing

Material

H-6A

322608663-0013

None DetectedNon-fibrous (Other)100%Black

Non-Fibrous

Homogeneous

Rubber Condoit

Jacket

H-6B

322608663-0014

None DetectedNon-fibrous (Other)100%Black

Non-Fibrous

Homogeneous

Rubber Condoit

Jacket

AC-1A

322608663-0015

None DetectedNon-fibrous (Other)100%Gray

Non-Fibrous

Homogeneous

Concrete

AC-1B

322608663-0016

None DetectedNon-fibrous (Other)100%Gray

Non-Fibrous

Homogeneous

Concrete

Initial report from: 04/15/2026 11:20:31

Page 1 of 2ASB_PLM_0008_0002 - 2.31 Printed: 4/15/2026 11:21 AM

LA Testing 520 Mission Street South Pasadena, CA 91030

Tel/Fax: (323) 254-9960 / (323) 254-9982 http://www.LATesting.com / pasadenalab@latesting.com

322608663LA Testing Order:

Customer ID: GECN21

Customer PO: E9453-02-01

Project ID:

Test Report: Asbestos Analysis of Bulk Materials via AHERA Method 40CFR 763 Subpart E

Appendix E supplemented with EPA 600/R-93/116 using Polarized Light Microscopy

Sample Description Appearance % Fibrous % Non-Fibrous

Non-Asbestos Asbestos

% Type

AC-1C

322608663-0017

None DetectedNon-fibrous (Other)100%Gray

Non-Fibrous

Homogeneous

Concrete

AC-2A

322608663-0018

None DetectedNon-fibrous (Other)100%Gray/Black

Non-Fibrous

Homogeneous

Asphalt

AC-2B

322608663-0019

None DetectedNon-fibrous (Other)100%Gray/Black

Non-Fibrous

Homogeneous

Asphalt

Analyst(s)

Nahid Motamedi (10)

Rafael Palacios (9)

Jerry Drapala Ph.D, Laboratory Manager or Other Approved Signatory

LA Testing maintains liability limited to cost of analysis. Interpretation and use of test results are the responsibility of the client. This report relates only to the samples reported above, and may not be reproduced, except in full, without written approval by LA Testing. LA Testing bears no responsibility for sample collection activities or analytical method limitations. The report reflects the samples as received. Results are generated from the field sampling data (sampling volumes and areas, locations, etc.) provided by the client on the Chain of Custody. Samples are within quality control criteria and met method specifications unless otherwise noted. The above analyses were performed in general compliance with Appendix E to Subpart E of 40 CFR (previously EPA 600/M4-82-020 “Interim

Method”) but augmented with procedures outlined in the 1993 (”final”) version of the method. This report must not be used by the client to claim product certification, approval, or endorsement by

NVLAP, NIST or any agency of the federal government. Non-friable organically bound materials present a problem matrix and therefore LA Testing recommends gravimetric reduction prior to analysis.

Unless requested by the client, building materials manufactured with multiple layers (i.e. linoleum, wallboard, etc.) are reported as a single sample. Estimation of uncertainty is available on request.

Samples analyzed by LA Testing South Pasadena, CA NVLAP Lab Code 200232-0, CA ELAP 2283

Initial report from: 04/15/2026 11:20:31

Page 2 of 2ASB_PLM_0008_0002 - 2.31 Printed: 4/15/2026 11:21 AM

OrderID: 322608663

OrderID: 322608663

April 15, 2026

Geocon Consultants, Inc.

Cord Dennig/Nick Rice

Attention: Cord Dennig/Nick Rice

RE: US-50/Hazel Avenue Bridges, E9453-02-01

Workorder No.: N082784FAX: (916) 852-9132

TEL: (916) 852-9118

3160 Gold Valley Drive, Suite 800 Rancho Cordova, CA 95742

The reported results relate only to the samples as received and parameters tested by the laboratory.

Thank you for the opportunity to service the needs of your company.

Please feel free to call me at (702) 307-2659 if I can be of further assistance to your company.

Sincerely, Nancy Sibucao

Laboratory Director

Enclosed are the results for sample(s) received on April 08, 2026 by ASSET Laboratories. The sample(s) are tested for the parameters as indicated in the enclosed chain of custody in accordance with the applicable laboratory certifications.

The cover letter is an integral part of this analytical report. This Laboratory Report cannot be reproduced in part or in its entirety without written permission from the client and ASSET Laboratories - Las Vegas.

15-Apr-26Date:ASSET Laboratories

Project: US-50/Hazel Avenue Bridges, E9453-02-01 CLIENT: Geocon Consultants, Inc.

Lab Order: N082784

CASE NARRATIVE

SAMPLE RECEIVING/GENERAL COMMENTS:

All sample containers were received intact with proper chain of custody documentation.

Information on sample receipt conditions including discrepancies can be found in attached Sample Receipt Checklist Form.

Cooler temperature and sample preservation were verified upon receipt of samples if applicable.

Samples were analyzed within method holding time.

Analytical Comments for EPA 6010B:

Matrix Spike Duplicate (MSD) is outside recovery criteria for Chromium in QC sample N082776- 001A-MSD possibly due to matrix interference. The associated Laboratory Control Sample (LCS) recovery was acceptable.

CLIENT: Geocon Consultants, Inc.

Lab Order: N082784 Work Order Sample Summary

Lab Sample ID Client Sample ID Collection DateMatrix Date Received

Contract No:

Date Reported

N082784-001A H-P1 4/2/2026 4/8/2026 4/15/2026Paint Chips

N082784-002A H-P2 4/2/2026 4/8/2026 4/15/2026Paint Chips

N082784-003A AC-P1 4/2/2026 4/8/2026 4/15/2026Paint Chips

N082784-004A AC-P2 4/2/2026 4/8/2026 4/15/2026Paint Chips

Client Sample ID: H-P1

Collection Date: 4/2/2026

Matrix: PAINT CHIPS

Analyses Result Qual Units Date Analyzed

CLIENT: Geocon Consultants, Inc.

Lab Order: N082784

DF

Lab ID: N082784-001

ASSET Laboratories Print Date: 15-Apr-26

PQL

ANALYTICAL RESULTS

TOTAL METALS BY ICP

EPA 6010B

Analyst: DJ

EPA 3050B

RunID: NV00922-ICP4_260408B 130775QC Batch: PrepDate: 4/8/2026

Chromium 4/8/2026 10:33 PM1.0 mg/Kg 12.5 Lead 4/8/2026 10:33 PM1.0 mg/Kg 16.6

Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified

DO Surrogate Diluted Out (M) Test is modified

Client Sample ID: H-P2

Collection Date: 4/2/2026

Matrix: PAINT CHIPS

Analyses Result Qual Units Date Analyzed

CLIENT: Geocon Consultants, Inc.

Lab Order: N082784

DF

Lab ID: N082784-002

ASSET Laboratories Print Date: 15-Apr-26

PQL

ANALYTICAL RESULTS

TOTAL METALS BY ICP

EPA 6010B

Analyst: DJ

EPA 3050B

RunID: NV00922-ICP4_260408B 130775QC Batch: PrepDate: 4/8/2026

Chromium 4/8/2026 10:35 PM1.0 mg/Kg 1110 Lead 4/8/2026 10:35 PM1.0 mg/Kg 117

Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified

Client Sample ID: AC-P1

Collection Date: 4/2/2026

Matrix: PAINT CHIPS

Analyses Result Qual Units Date Analyzed

CLIENT: Geocon Consultants, Inc.

Lab Order: N082784

DF

Lab ID: N082784-003

ASSET Laboratories Print Date: 15-Apr-26

PQL

ANALYTICAL RESULTS

TOTAL METALS BY ICP

EPA 6010B

Analyst: DJ

EPA 3050B

RunID: NV00922-ICP4_260408B 130775QC Batch: PrepDate: 4/8/2026

Chromium 4/8/2026 10:38 PM1.0 mg/Kg 17.0 Lead 4/8/2026 10:38 PM1.0 mg/Kg 13.5

Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified

Client Sample ID: AC-P2

Collection Date: 4/2/2026

Matrix: PAINT CHIPS

Analyses Result Qual Units Date Analyzed

CLIENT: Geocon Consultants, Inc.

Lab Order: N082784

DF

Lab ID: N082784-004

ASSET Laboratories Print Date: 15-Apr-26

PQL

ANALYTICAL RESULTS

TOTAL METALS BY ICP

EPA 6010B

Analyst: DJ

EPA 3050B

RunID: NV00922-ICP4_260409I 130775QC Batch: PrepDate: 4/8/2026

Chromium 4/9/2026 05:55 PM5.0 mg/Kg 514 Lead 4/9/2026 05:55 PM5.0 mg/Kg 5ND

Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified

CLIENT: Geocon Consultants, Inc.

Work Order: N082784

ANALYTICAL QC SUMMARY REPORT

TestCode: 6010_S

Sample ID MB-130775

Batch ID: 130775 TestNo: EPA 6010B Analysis Date: 4/8/2026

Prep Date: 4/8/2026

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/Kg

PQL

Client ID: PBS

RunNo: 217598

SeqNo: 7576246

MBLKSampType: TestCode: 6010_S

EPA 3050B

Chromium 1.0ND Lead 1.00.249

Sample ID LCS1-130775

Batch ID: 130775 TestNo: EPA 6010B Analysis Date: 4/8/2026

Prep Date: 4/8/2026

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/Kg

PQL

Client ID: LCSS

RunNo: 217598

SeqNo: 7576247

LCSSampType: TestCode: 6010_S

EPA 3050B

Chromium 25.00 103 80 1201.0 025.633 Lead 25.00 103 80 1201.0 025.737

Sample ID LCS2-130775

Batch ID: 130775 TestNo: EPA 6010B Analysis Date: 4/8/2026

Prep Date: 4/8/2026

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/Kg

PQL

Client ID: LCSS

RunNo: 217598

SeqNo: 7576248

LCSSampType: TestCode: 6010_S

EPA 3050B

Chromium 25.00 103 80 1201.0 025.657 Lead 25.00 102 80 1201.0 025.603

Sample ID LCS3-130775

Batch ID: 130775 TestNo: EPA 6010B Analysis Date: 4/8/2026

Prep Date: 4/8/2026

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/Kg

PQL

Client ID: LCSS

RunNo: 217598

SeqNo: 7576249

LCSSampType: TestCode: 6010_S

EPA 3050B

Chromium 25.00 103 80 1201.0 025.702 Lead 25.00 103 80 1201.0 025.687

Sample ID LCS4-130775

Batch ID: 130775 TestNo: EPA 6010B Analysis Date: 4/8/2026

Prep Date: 4/8/2026

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/Kg

PQL

Client ID: LCSS

RunNo: 217598

SeqNo: 7576250

LCSSampType: TestCode: 6010_S

EPA 3050B

Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded

ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference DO Surrogate Diluted Out Calculations are based on raw values (M) Test is modified

CLIENT: Geocon Consultants, Inc.

Work Order: N082784

ANALYTICAL QC SUMMARY REPORT

TestCode: 6010_S

Sample ID LCS4-130775

Batch ID: 130775 TestNo: EPA 6010B Analysis Date: 4/8/2026

Prep Date: 4/8/2026

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/Kg

PQL

Client ID: LCSS

RunNo: 217598

SeqNo: 7576250

LCSSampType: TestCode: 6010_S

EPA 3050B

Chromium 25.00 103 80 1201.0 025.678 Lead 25.00 103 80 1201.0 025.641

Sample ID N082776-001A-MS

Batch ID: 130775 TestNo: EPA 6010B Analysis Date: 4/8/2026

Prep Date: 4/8/2026

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/Kg

PQL

Client ID: ZZZZZZ

RunNo: 217598

SeqNo: 7576254

MSSampType: TestCode: 6010_S

EPA 3050B

Chromium 24.88 103 75 1251.0 16.8942.573 Lead 24.88 93.6 75 1251.0 8.88332.174

Sample ID N082776-001A-MSD

Batch ID: 130775 TestNo: EPA 6010B Analysis Date: 4/8/2026

Prep Date: 4/8/2026

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/Kg

PQL

Client ID: ZZZZZZ

RunNo: 217598

SeqNo: 7576255

MSDSampType: TestCode: 6010_S

EPA 3050B

Chromium 25.00 132 75 125 20 S1.0 16.89 42.57 15.949.935 Lead 25.00 97.4 75 125 201.0 8.883 32.17 3.2833.246

Sample ID N082783-001A-DUP

Batch ID: 130775 TestNo: EPA 6010B Analysis Date: 4/8/2026

Prep Date: 4/8/2026

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/Kg

PQL

Client ID: ZZZZZZ

RunNo: 217598

SeqNo: 7576260

DUPSampType: TestCode: 6010_S

EPA 3050B

Chromium 201.0 39.44 0.12439.487 Lead 201.0 5.795 0.4045.771

Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded

ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference

ASSET Laboratories Please review the checklist below. Any NO signifies non-compliance. Any non-compliance will be noted and must be understood as having an impact on the quality of the data. All tests will be performed as requested regardless of any compliance issues.

If you have any questions or further instruction, please contact our Project Coordinator at (702) 307-2659.

Carrier name: Southwest Express

Cooler Received/Opened On: 4/8/2026

Rep sample Temp (Deg C): 2.9 IR Gun ID: 4

Temp Blank: Yes No

Last 4 digits of Tracking No.: 0652

Cooling process: Ice Ice Pack Dry Ice Other None

Packing Material Used: None

Workorder: N082784

Sample Receipt Checklist

4. Chain of custody present? Yes No

6. Chain of custody signed when relinquished and received? Yes No

7. Chain of custody agrees with sample labels? Yes No

8. Samples in proper container/bottle? Yes No

9. Sample containers intact? Yes No

10. Sufficient sample volume for indicated test? Yes No

11. All samples received within holding time? Yes No

Yes No NA13. Water - VOA vials have zero headspace?

14. Water - pH acceptable upon receipt? Yes No NA Example: pH > 12 for (CN,S); pH<2 for Metals

1. Shipping container/cooler in good condition? Yes No Not Present

2. Custody seals intact, signed, dated on shippping container/cooler? Yes No Not Present

3. Custody seals intact on sample bottles? Yes No Not Present

5. Sampler's name present in COC? Yes No

12. Temperature of rep sample or Temp Blank within acceptable limit? Yes No NA

Yes No NA15. Did the bottle labels indicate correct preservatives used?

16. Were there Non-Conformance issues at login? Yes No NA Was Client notified? Yes No NA

Comments:

Checklist Completed By: VM Reviewed By: YR 04/10/2026

Sample ID Client Sample ID Date Collected

Date Received:

Date Due Matrix Test No

WORK ORDER Summary 08-Apr-26

WorkOrder: N082784

Comments: Standard Geocon Base Rates

Client ID: GEOCO02 Project: US-50/Hazel Avenue Bridges, E9453-02-01 QC Level: CT

Hld MS Sub

4/8/2026

Test Name

ASSET Laboratories

Storage

9:45 AM

N082784-001A H-P1 4/2/2026 4/15/2026 Paint Chips EPA 3050B SOPREP TOTAL METALS WS

4/15/2026 EPA 6010B TOTAL METALS BY ICP WS

N082784-002A H-P2 4/15/2026 EPA 3050B SOPREP TOTAL METALS WS

4/15/2026 EPA 6010B TOTAL METALS BY ICP WS

N082784-003A AC-P1 4/15/2026 EPA 3050B SOPREP TOTAL METALS WS

4/15/2026 EPA 6010B TOTAL METALS BY ICP WS

N082784-004A AC-P2 4/15/2026 EPA 3050B SOPREP TOTAL METALS WS

4/15/2026 EPA 6010B TOTAL METALS BY ICP WS

N082784-005A FOLDER 4/15/2026 4/15/2026 Folder Folder LAB

4/15/2026 Folder Folder LAB

1 of 1Page

May 11, 2026

Geocon Consultants, Inc.

Cord Dennig/Nick Rice

Attention: Cord Dennig/Nick Rice

RE: US-50/Hazel Avenue Bridges, E9453-02-01

Workorder No.: N083523FAX: (916) 852-9132

TEL: (916) 852-9118

3160 Gold Valley Drive, Suite 800 Rancho Cordova, CA 95742

The reported results relate only to the samples as received and parameters tested by the laboratory.

Thank you for the opportunity to service the needs of your company.

Please feel free to call me at (702) 307-2659 if I can be of further assistance to your company.

Sincerely, Nancy Sibucao

Laboratory Director

Enclosed are the results for sample(s) received on May 04, 2026 by ASSET Laboratories. The sample(s) are tested for the parameters as indicated in the enclosed chain of custody in accordance with the applicable laboratory certifications.

The cover letter is an integral part of this analytical report. This Laboratory Report cannot be reproduced in part or in its entirety without written permission from the client and ASSET Laboratories - Las Vegas.

11-May-26Date:ASSET Laboratories

CLIENT: Geocon Consultants, Inc.

Lab Order: N083523

CASE NARRATIVE

SAMPLE RECEIVING/GENERAL COMMENTS:

All sample containers were received intact with proper chain of custody documentation.

Information on sample receipt conditions including discrepancies can be found in attached Sample Receipt Checklist Form.

Cooler temperature and sample preservation were verified upon receipt of samples if applicable.

Samples were analyzed within method holding time.

This is an addendum for Work order N082784.

Analytical Comments for WET/EPA 6010B:

Dilution was necessary due to sample matrix.

CLIENT: Geocon Consultants, Inc.

Lab Order: N083523 Work Order Sample Summary

Lab Sample ID Client Sample ID Collection DateMatrix Date Received

Contract No:

Date Reported

N083523-001A H-P2 4/2/2026 5/4/2026 5/11/2026Paint Chips

Client Sample ID: H-P2

Collection Date: 4/2/2026

Matrix: PAINT CHIPS

Analyses Result Qual Units Date Analyzed

CLIENT: Geocon Consultants, Inc.

Lab Order: N083523

DF

Lab ID: N083523-001

ASSET Laboratories Print Date: 11-May-26

PQL

ANALYTICAL RESULTS

ICP METALS BY STLC

WET/ EPA 6010B

Analyst: MN

EPA 3010A

RunID: NV00922-ICP4_260508A 131661QC Batch: PrepDate: 5/8/2026

Chromium 5/8/2026 03:56 PM0.25 mg/L 51.1

Qualifiers: B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded ND Not Detected at the Reporting Limit S Spike/Surrogate outside of limits due to matrix interference Results are wet unless otherwise specified

CLIENT: Geocon Consultants, Inc.

Work Order: N083523

ANALYTICAL QC SUMMARY REPORT

TestCode: 6010_ST

Sample ID: MB-131661

Batch ID: 131661 TestNo: WET/ EPA 60 Analysis Date: 5/8/2026

Prep Date: 5/8/2026

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

PQL

Client ID: PBS

RunNo: 219082

SeqNo: 7688089

MBLKSampType: TestCode: 6010_ST

EPA 3010A

Chromium 0.0500.00029

Sample ID: MB-131542 STLC

Batch ID: 131661 TestNo: WET/ EPA 60 Analysis Date: 5/8/2026

Prep Date: 5/8/2026

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

PQL

Client ID: PBS

RunNo: 219082

SeqNo: 7688090

MBLKSampType: TestCode: 6010_ST

EPA 3010A

Chromium 0.250.001

Sample ID: LCS-131661

Batch ID: 131661 TestNo: WET/ EPA 60 Analysis Date: 5/8/2026

Prep Date: 5/8/2026

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

PQL

Client ID: LCSS

RunNo: 219082

SeqNo: 7688091

LCSSampType: TestCode: 6010_ST

EPA 3010A

Chromium 0.5000 99.6 85 1150.050 00.498

Sample ID: N083524-004A-DUP

Batch ID: 131661 TestNo: WET/ EPA 60 Analysis Date: 5/8/2026

Prep Date: 5/8/2026

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

PQL

Client ID: ZZZZZZ

RunNo: 219082

SeqNo: 7688098

DUPSampType: TestCode: 6010_ST

EPA 3010A

Chromium 200.25 0.1013 00.102

Sample ID: N083524-004A-MS

Batch ID: 131661 TestNo: WET/ EPA 60 Analysis Date: 5/8/2026

Prep Date: 5/8/2026

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

PQL

Client ID: ZZZZZZ

RunNo: 219082

SeqNo: 7688102

MSSampType: TestCode: 6010_ST

EPA 3010A

Chromium 0.5000 95.7 75 1250.25 0.10130.580

Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded

ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference

CLIENT: Geocon Consultants, Inc.

Work Order: N083523

ANALYTICAL QC SUMMARY REPORT

TestCode: 6010_ST

Sample ID: N083524-004A-MSD

Batch ID: 131661 TestNo: WET/ EPA 60 Analysis Date: 5/8/2026

Prep Date: 5/8/2026

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: mg/L

PQL

Client ID: ZZZZZZ

RunNo: 219082

SeqNo: 7688103

MSDSampType: TestCode: 6010_ST

EPA 3010A

Chromium 0.5000 95.0 75 125 200.25 0.1013 0.5796 0.5710.576

Qualifiers:

B Analyte detected in the associated Method Blank E Value above quantitation range H Holding times for preparation or analysis exceeded

ND Not Detected at the Reporting Limit R RPD outside accepted recovery limits S Spike/Surrogate outside of limits due to matrix interference

Subject: Re: US-50/Hazel Avenue Bridges, E9453-02-01 (ASSET Labs No. N082784) From: Yoandra Rodriguez <yoandra@assetlaboratories.com> Date: 5/4/2026, 11:35 AM To: Nick Rice <rice@geoconinc.com>, Reports LV <reports.lv@assetlaboratories.com>, "Marlon B.

Car�n" <marlon@assetlaboratories.com> CC: "maryann.balilu@assetlaboratoriesph.com" <maryann.balilu@assetlaboratoriesph.com>, 'ASSET Sample Control LV' <samplecontrol.lv@assetlaboratories.com>, "vaughn@assetlaboratories.com" <vaughn@assetlaboratories.com>

Hello Nick, We'll do.

Sample control please proceed.

Thanks, Yoandra Rodriguez Project Manager

Nevada: 3151 W. Post Road, Las Vegas, NV 89118 | P: 702.307.2659 | F: 702.307.2691

Northern California: 4020 Lennane Dr., Sacramento, CA 95834 | M: 702.439.0421

Southern California: 11110 Artesia Blvd., Ste. B, Cerritos, CA 90703 | P: 562.219.7435 | F: 562.219.7436

ASSET LABORATORIES - Serving Clients with Passion and Professionalism

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