COSM_COB1_2nd_Fl_Hazmat_Survey_Report.pdf

Limited Pre-Renovation Hazardous Materials Survey Report County of San Mateo

Second Floor 455 County Center, Redwood City, CA

Prepared for:

555 County Center Redwood City, CA 94063

Prepared By:

Vista Environmental Consulting

2984 Teagarden Street San Leandro, CA 94577

May 31, 2026

Project No. 261101007 i

TABLE OF CONTENTS

EXECUTIVE SUMMARY

PAGE

1. INTRODUCTION 1

2. METHODOLOGY 2

3. RESULTS 4

4. RECOMMENDATIONS 5

5. LIMITATIONS & EXCLUSIONS 8

APPENDICES

A. BUILDING DATA

Asbestos Materials Summary

Asbestos Sampling Inventory

Asbestos Sample Location Drawings

Asbestos Analytical Reports

Lead Materials Summary

Lead XRF Sequential Reports

Other Hazardous Materials Summary i

EXECUTIVE SUMMARY

Vista Environmental Consulting (Vista) performed a limited pre-renovation hazardous materials survey of the second floor at 455 County Center, Redwood City, CA 94063 (Project Site). The survey was performed to identify and sample accessible, suspect asbestos-containing materials, representative building components for the presence of lead-containing surface coatings/lead-based paints (LCSC/LBP), Polychlorinated Biphenyls (PCBs) in light fixture ballasts, and other hazardous materials that may be in the path the construction. Vista performed the survey on May 2, 2026.

The following building was surveyed and contain the following hazardous materials:

Building/Areas Asbestos Lead-Based Paint or

Materials Lead Containing

Paint

Universal Waste, Suspect PCBs, and Other Hazardous

Materials

The Asbestos Materials Summary, Asbestos Sampling Inventories, Asbestos Sample Location Drawings, Asbestos Analytical Reports, Lead Materials Summary, Lead XRF Sequential Reports, and Other

Hazardous Materials Summary can be found in Appendix A – Survey Data.

The documents found in the appendices are not stand-alone documents and should not be separated from this report. Quantities and locations listed in the tables are order of magnitude estimates and are not to be used for bidding purposes. It is the sole responsibility of the contractor to verify quantities and locations of hazardous materials in the path of construction through site visits and contractual bid set documents, including, but not limited to all specifications, drawings, and addenda. Any discrepancies between the contractual bid set documentation and site visits must be submitted in writing to the Owner or Owner’s representative, prior to bidding.

Bay Area Air District (BAAD) classifications are based upon the material’s condition at the time of the survey or as rendered as a result of standard manual removal/demolition techniques. The use of

“mechanical means”, non-standard or other aggressive removal/demolition techniques may result in a different classification.

All Class I and II asbestos (>0.1%) disturbance and/or removal operations must be conducted by a

Cal/OSHA registered and State licensed asbestos removal contractor. All disturbance and/or abatement operations should be under the direction of a California Certified Asbestos Consultant.

Should the removal of identified regulated asbestos-containing materials (RACM) involve at least 100 square feet or 100 linear feet per project site, per year, then notification to the BAAD and Cal/OSHA must be accomplished prior to the initiation of such activities.

ii

All activities involving potential and identified lead-containing surfaces should be conducted in accordance with California Health & Safety Code sections 17920.10 and 10525, 10525.7, Title 8, California Code of Regulations (CCR), Section 1532.1.

In addition, all removal activities involving identified lead-based paints (LBP) must be conducted in accordance with Title 17, CCR, Division 1, Chapter 8, Sections 35001 through 36100, which proscribes the use of California Department of Public Health (CDPH) certified workers, work practices, and other requirements.

Written notification to Cal/OSHA must be accomplished should LBP activities involve equal to or more than 100 square feet or 100 linear feet of removal in accordance with the requirements of 8 CCR 1532.1.

Any welding, cutting or heating of metal surfaces containing surface coatings should be conducted in accordance with 8 CCR 1537 Welding, Cutting, and Heating of Coated Metals, which require surfaces covered with toxic preservatives, and in enclosed areas, be stripped of all toxic coatings for a distance of at least 4 inches, in all directions, from the area of heat application prior to the initiation of such heat application, or 8 CCR 1536 Ventilation Requirements for Welding, Brazing, and Cutting.

All potential and identified Universal Waste materials (UW) and Electronic Waste (E-Waste) impacted by the work should be removed and recycled or disposed of in accordance with the UW guidelines established by the DTSC, as stated in 22 CCR Sections 66261.9 and 66273.1 thru 66273.90.

All ballasts must be visually inspected prior to disposal to determine if they contain PCBs. Those ballasts marked No PCB’s or PCB Free can be considered as such as should be treated as UW - electronic waste.

All PCB-containing devices, including, but not limited to ballasts should be removed or have the oils removed and properly handled, collected, stored, transported and recycled or disposed of by an approved recycling or disposal facility in accordance with the requirements of Title 22 CCR 67426.1.

Should materials similar to those identified in this report, or if other forms of suspect hazardous materials are encountered, contractors should be instructed to immediately cease work activities which may initiate an exposure episode, and notify the appropriate management personnel.

iii

Report prepared for the Company by:

Christopher R. Burns Senior Project Manager

CAC #92-0224

LRCIA #LRC-00006938

455 County Center, Redwood City, 2nd Floor May 31, 2026 Hazardous Materials Survey Report Project No. 261101007

1.0 INTRODUCTION

Vista Environmental Consulting, Inc. (Vista) has prepared this limited pre-renovation hazardous materials survey report for the second floor at 455 County Center, Redwood City, CA 94063 (Project Site) for the

County of San Mateo (COSM).

The survey of the Project Site was generally consistent with the Vista proposal dated April 11, 2026 and approved by COSM.

The following areas of the building was surveyed:

The purpose of this survey was to identify hazardous building materials so they can be removed; waste characterized, and properly disposed of prior to being impacted by renovation activities. The data provided in this report can assist all parties involved in this project make informed decisions with regards to regulatory compliance and the health and safety of their employees. This survey included the following:

Visible and accessible suspect asbestos-containing materials (ACM) were assessed and sampled to determine asbestos content.

Representative painted and coated building components were assessed and categorized based upon standard selective demolition practices and sampled for lead content which can be used in preliminary waste stream characterization estimates.

Visible and accessible materials with the potential to have hazardous properties that are regulated and are commonly found in buildings were assessed, but not sampled. These materials include, but are not limited to:

Universal Waste (UW) materials, such as non-incandescent lamps, batteries, mercury-containing devices, and electronic waste; Batteries include, but are not limited to those found in exit signs, emergency lights, fire alarm systems, and back-up power systems;

Polychlorinated biphenyls (PCBs) containing devices such as lamp ballasts, wet-type transformers, and hydraulic systems;

Devices which may contain ozone depleting chemicals, such as Heating, Ventilation and

Air Conditioning (HVAC) systems, refrigerators, freezers, fire suppression systems and water coolers/fountains;

Devices with low-level radioactive sources such as smoke detectors and exit signs.

2.0 METHODOLOGY

Vista performed the pre-demolition hazardous materials survey on May 2, 2026.

Vista’s personnel on the project were:

Christopher Burns, a State of California Division of Occupational Safety and Health (Cal/OSHA)

Certified Asbestos Consultant (CAC) # 92-0224 and a State of California Department of Public

Health (CDPH) Lead Related Construction Certified Inspector/Assessor (LRCIA) #LRC-

00006938

Javier Rocha, a Cal/OSHA Certified Site Surveillance Technician (CSST) #02-3244

Vista’s intent was to perform a thorough survey and made a good faith effort to access all building materials down to the structural components and/or interstitial spaces. Quantities and locations are based upon areas that were accessed. Materials similar to those in this report may be present in areas which were not accessed.

2.1 Asbestos

The asbestos survey was performed generally in accordance with the AHERA protocol (40 CFR Part 763, Subpart E). Visual identification was performed by assessing visible and accessible structural, architectural, and mechanical components for the presence of suspect ACM at the Project Site.

This limited ACM survey was conducted in the following manner:

➢ Suspect ACM was categorized into homogeneous materials. A homogeneous material is defined as being a surfacing material, thermal system insulation, or miscellaneous material which is uniform in color and texture. It may also be additionally subcategorized using the date of installation, when available.

➢ A sampling scheme was developed based upon the location and quantity of the suspect homogeneous ACM. A rough order of magnitude estimate of each suspect homogenous ACM was calculated and recorded for future reference. A sampling scheme, including a specific number of samples per suspect homogeneous ACM, was calculated prior to sampling.

➢ Sampling guidelines established by the United States Environmental Protection Agency (USEPA) were utilized for sampling each suspected homogeneous ACM. Methods described in Appendix

K of 8 California Code of Regulation (CCR) 1529 were utilized in the collection of each suspect homogeneous ACM sample.

➢ Trained California asbestos certified personnel, using appropriate sampling tools and sterile leak-tight Whirl-pak® containers, collected building materials that were suspected to contain ACM.

➢ Each suspect ACM sample was collected and sealed in its container and appropriately labeled with a unique sample identification number and recorded on an asbestos bulk sampling log. Each log contains a chain-of-custody to assure the proper transition of the samples from Vista to the analytical laboratory.

➢ Sampling tools were decontaminated, by using a clean wet cloth, between collection of each suspect sample to prevent the possibility of cross contamination of subsequent suspect ACM samples.

Suspect ACM samples were delivered, under proper chain-of-custody protocol, to SGS Laboratories

(SGS) in Hayward, California. SGS is accredited under the National Voluntary Laboratory Accreditation

Program (NVLAP) and the California Environmental Laboratory Accreditation Program (Cal-ELAP).

The samples were submitted for analysis by Polarized Light Microscopy (PLM) utilizing dispersion staining techniques in accordance with the EPA’s “Method for the Determination of Asbestos in Bulk

Building Materials” U.S. EPA/600/R-93/116, Visual Area Estimate, dated July 1993 and adopted by the

NVLAP as Test Method Code 18/A01.

2.2 Lead

Vista’s lead construction screening survey used an X-Ray Fluorescence (XRF) direct read spectrum analyzer device to take readings of representative painted and coated surfaces and collected bulk samples for evaluation of lead levels for worker health and safety and preliminary waste characterization prior to construction activities.

The XRF device used was a Viken Detection, XRF Lead Paint Analyzer, Model Pb200i. This device is a thermoelectrically-cooled, sealed, CdTe diode detector optimized X-ray detection and uses a sealed cobalt

57, 5mCi (185 MBq) isotope for an excitation source.

This survey was a limited screening of paint for the purpose of characterizing the lead content in paint and coatings likely to be disturbed during work activities. For this purpose, XRF analysis was used to screen for lead levels and provides results that are generally representative of typical conditions but are not inclusive of all painted/coated surfaces present at the Project Site. This survey was not a surface-by-surface inspection as outlined in the U.S. Department of Housing and Urban Development (HUD)

Guidelines for the Evaluation and Control of Lead-Based Paint Hazards in Housing pursuant to Title X of the Housing and Community Development Act of 1992. These analytical data can be helpful in evaluation of lead-related environmental risks in general, but cannot be used to calculate worker exposures and is not a substitute for employee exposure monitoring or waste stream sampling.

Lead-Based Paint (LBP) is defined by CDPH as any paint containing lead levels exceeding 0.5 wt % (or

5,000 ppm or mg/kg) via paint chip sampling or 1.0 milligrams per centimeter squared (mg/cm²) or greater via X-Ray Fluorescence (XRF) direct read instrument sampling. Cal/OSHA rules apply to “any detectable concentration of lead” without a specified detection level.

2.3 Other Hazardous Materials

Devices with potential hazardous materials were visually identified during the survey walk-through and their quantities were estimated and recorded. No attempt was made to disassemble devices or sample suspect materials within the devices. For example, fluorescent light fixtures must be presumed to contain

Universal Waste lamps, and ballasts which contain PCB oil are electronic waste, pending removal and disassembly of each unit to determine explicit product specific information that proves otherwise.

3.0 RESULTS

The following areas of the building was surveyed and contain the following hazardous materials:

Building/Areas Asbestos Lead-Based Paint or

Materials Lead Containing

Paint

Universal Waste, Suspect PCBs, and Other Hazardous

Materials

The Asbestos Materials Summary, Asbestos Sampling Inventories, Asbestos Sample Location Drawings, Asbestos Analytical Reports, Lead Materials Summary, Lead XRF Sequential Reports, and Other

Hazardous Materials Summary can be found in Appendix A – Survey Data.

The documents found in the appendices are not stand-alone documents and should not be separated from this report. Quantities and locations listed in the tables are order of magnitude estimates and are not to be used for bidding purposes. It is the sole responsibility of the contractor to verify quantities and locations of hazardous materials in the path of construction through site visits and contractual bid set documents, including, but not limited to all specifications, drawings, and addenda. Any discrepancies between the contractual bid set documentation and site visits must be submitted in writing to the Owner or Owner’s representative, prior to bidding.

BAAD classifications are based upon the material’s condition at the time of the survey or as rendered as a result of standard manual removal/demolition techniques. The use of “mechanical means”, non-standard or other aggressive removal/demolition techniques may result in a different classification.

4.0 RECOMMENDATIONS

4.1 Asbestos

The results of the survey indicate that asbestos-containing materials are present at the Project Site.

Fireproofing debris was identified throughout the ceiling plenum, including, but not limited to ceiling tiles/grid and windows black iron supports. It is assumed to be inside open wall, column, and other cavities.

Fireproofing/Overspray was also identified on spandrel beams above windows and may extend outside the building in the soffit which could necessitate removing the windows and installing safety barriers to access.

The window abatement is not anticipated to be part of this renovation project.

Work performed during any activities that disturb the asbestos-containing materials identified in this report must be done in compliance with the most recent edition of all applicable federal, state, and local regulations, standards, and codes governing abatement, transport, and disposal of asbestos-containing materials. These include, but are not limited to, the following:

CCR, Title 8, Chapter 3.2, Subchapter 2, Article 2.5 - Registration Asbestos-Related Work

Sections 341.6 through 341.14

CCR, Title 8, Section 1529 - Asbestos in the Construction Industry

BAAD Regulation 11, Hazardous Pollutants, Rule 2, Asbestos Demolition, Renovation and

Manufacturing

40 CFR Part 763 - Subpart E, Asbestos Containing Materials in Schools (AHERA)

Materials encountered in the buildings that are not part of this report must be properly sampled for the content of asbestos or assumed to be asbestos containing prior to any disturbance.

Prior to Class I and II activities which will disturb identified or assumed asbestos, a Cal/OSHA registered and California licensed asbestos contractor must be utilized for abatement of asbestos that will be impacted. Vista recommends that all abatement operations be conducted under the direction of a

California Certified Asbestos Consultant.

4.2 Lead

The results of the survey indicate that lead-based paints/materials and lead-containing paints/materials are present in the path of construction at the Project Site.

At present there is no state or federal regulation requiring mandatory lead removal or abatement prior to disturbance of building materials with identified lead paint or coatings. However, there are applicable

Cal/OSHA worker protection and training requirements, Cal/EPA waste disposal requirements, CDPH requirements for public and residential buildings, and SB 460 lead hazard regulations that apply to lead-related construction activities, abatement activities and their associated wastes. The following is a brief discussion and summary of applicable regulatory requirements:

Cal/OSHA: Title 8, California Code of Regulation (CCR), Section 1532.1 (8 CCR 1532.1) governs occupational exposure to lead. This regulation requires that prior to initiation of certain activities, referred to as “trigger tasks”, workers must be trained, medically evaluated, and properly fitted with respiratory protection, and protective clothing until statistically reliable personal eight-hour time weighted average

(TWA) results indicate lead exposure levels below the Personal Exposure Limit (PEL) for each unique task which disturbs lead-based and lead-containing coatings. This process is known as a Negative

Exposure Assessment or NEA.

If the result of the exposure assessment is above the Action Level (AL) additional monitoring is required and if the result is above the PEL additional exposure monitoring, worker protection (including respirator protection and PPE), training and medical requirements apply. However, even where the NEA criteria is met, certain hazard communication training and work practice controls still apply where lead is disturbed.

“Trigger tasks” are tasks that are assumed to exceed the PEL pending an exposure assessment and they encompass the majority of construction activities that disturb surface coatings. Examples of “trigger” tasks range from manual paint scraping as a lower expected exposure up to hot work and abrasive blasting as the highest expected exposures, and include any non-listed task that the employer determines may potentially expose employees to lead levels above the AL.

“OSHA does not consider any method that relies solely on the analysis of bulk materials or surface content of lead (or other toxic material) to be acceptable for safely predicting employee exposure to airborne contaminates. Without air monitoring results or without the benefit of historical or objective data (including air sampling which clearly demonstrates that the employee cannot be exposed above the action level during any process, operation, or activity) the analysis of bulk or surface samples cannot be used to determine employee exposure.”- OSHA Standard Interpretation May 8, 2000.

OSHA states that these rules apply to “any detectable concentration of lead” without a specified detection level. Due to the Consumer Product Safety Commission currently allowing paint to contain up to 90 parts per million (ppm) or 0.009 wt% of lead, the variation of lead content due to aging and weathering, and the variation of detection limits associated with analysis of bulk materials, such as paint chips and surface content analysis via XRF, it is recommended that all painted or coated surfaces be treated as potentially containing lead. Positive analytical results by either method can be used to indicate that detectable lead is present but negative results cannot be interpreted as conclusively demonstrating the absence of lead.

Analytical data from analysis of bulk materials or surface content of lead can be helpful in evaluation of lead-related environmental risks in general but cannot be used to calculate worker exposures and are not a substitute for employee exposure monitoring. As a result of the above, any employee that works around potential lead-based or lead-containing coatings must have HAZCOM training and personal exposure air monitoring is additionally required for employees that disturb such coatings. Significant additional certification, notification, and work practices are required for materials found to be lead-based.

Any welding, cutting or heating of metal surfaces containing surface coatings should be conducted in accordance with 29 CFR 1926.354 and 8 CCR 1537. These regulations require surfaces covered with toxic preservatives, and in enclosed areas, be stripped of all toxic coatings for a distance of at least 4 inches, in all directions, from the area of heat application prior to the initiation of such heat application.

Cal/EPA through the Division of Toxic Substance Control (DTSC) regulates disposal of lead hazardous waste (22 CCR Division 4.5, Minimum Standards for Management of Hazardous and Extremely

Hazardous Wastes). DTSC has issued guidance indicating that architectural debris with intact lead paint is normally expected to be handled as general construction waste. However, waste stream segregation and analysis is still required for all lead painted or coated debris regardless if the paint or coating is intact on a building component or not. The resulting wastes may be hazardous under California and federal RCRA standards for lead and therefore require proper handling, packaging, labeling, and transportation under a proper manifest to a permitted hazardous waste storage, treatment and disposal facility.

CDPH: The Department of Public Health (CDPH) has specific requirements (Title 17 Sections 35001 thru 36100 et. al.) for hazard assessment and work in public or residential structures in regards to lead-based paint. These regulations require special certifications, work practices, and notification for such activities.

Senate Bill 460 (SB 460): An act to amend Section 1941.1 of the Civil Code, and to amend Sections

17961, 17980, and 124130 of, and to add Sections 17920.10, 105251, 105252, 105253, 105254, 105255, 105256, and 105257 to, the Health and Safety Code, relating to lead abatement. This bill allows for fines and criminal penalties to be levied on any person who is found to have performed lead abatement without containment or created a measurable “lead hazard” based upon current CDPH standards. A “lead hazard” means deteriorated lead-based paint, lead contaminated dust, lead contaminated soil, disturbing lead-based paint or presumed lead-based paint without containment, or any other nuisance which may result in persistent and quantifiable lead exposure.

Vista recommends that all parties that come into contact with paint that has detectable lead content follow all applicable federal, state and local regulations relating to employee health and safety and proper disposal of generated wastes.

4.3 Other Hazardous Materials

Other hazardous materials are present in the path of construction at the Project Site.

All potential and identified Universal Waste materials (UW) and Electronic Waste (E-Waste) impacted by the work should be removed and recycled or disposed of in accordance with the UW guidelines established by the DTSC, as stated in 22 CCR Sections 66261.9 and 66273.1 thru 66273.90.

Vista’s limited visual survey indicated that light fixtures with ballasts that may contain PCB oil are present. However, due to the limited nature of the random spot checks, Vista recommends that all ballasts be visually inspected prior to disposal to determine if they contain PCBs. Those ballasts marked No

PCB’s or PCB Free can be considered as such as should be treated as UW - electronic waste.

All personnel who perform hazardous materials work must be trained and qualified to do so. They must also follow the most current OSHA regulations including 29 CFR 1910.120 and 8 CCR 5192, Hazardous

Waste Operations and Emergency Response, as well as other applicable federal, state and local laws and regulations.

5.0 LIMITATIONS & EXCLUSIONS

Quantities and locations are based upon areas that were accessed. Materials similar to those in this report may be present in areas which were not accessed. Because of this, Vista recommends including line-item pricing, allowances, and/or additive/deductive wording to bid sheets for unforeseen conditions.

All material quantities reported herein are rough order of magnitude estimates and should not be used for bidding purposes. All contractors are responsible for accurately determining quantities and locations of materials identified in this report.

The survey performed was limited to representative rooms/areas and did not include access of areas and sampling of materials which would have required large scale destructive testing. Vista made a good faith effort based on accepted industry standards to access all areas in order to assess their potential for having hazardous materials.

Respectfully Submitted, Vista Environmental Consulting

Christopher R. Burns Senior Project Manager

CAC #92-0224

LRCIA #LRC-00006938

APPENDIX A - SURVEY DATA

COUNTY OF SAN MATEO

455 COUNTY CENTER, REDWOOD CITY

SECOND FLOOR

The information contained in these appendices are not stand-alone documents and should not be separated from this report.

For specific regulatory requirements regarding these materials please refer to the information provided in the Main Report.

Quantities and locations listed in the tables are order of magnitude estimates and are not to be used for bidding purposes. It is the sole responsibility of the contractor to verify quantities and locations of hazardous materials in the path of construction through site visits and contractual bid set documents, including, but not limited to all specifications, drawings, and addenda.

Any discrepancies between the contractual bid set documentation and site visits must be submitted in writing to the Owner or

Owner’s representative, prior to bidding.

BAAD classifications are based upon the material’s condition at the time of the survey or as rendered as a result of standard manual removal/demolition techniques. The use of “mechanical means”, non-standard or other aggressive removal/demolition techniques may result in a different classification. BAAD & Cal-OSHA classifications are based on the materials being >1% asbestos pending further analytical data that proves otherwise.

ASBESTOS MATERIALS SUMMARY

Asbestos

HOMO.

ID

MATERIAL DESCRIPTION LOCATION

CAL/OSHA

CLASS

BAAD

CATEGORY

ESTIMATED

QUANTITY

C Vinyl Floor Tile/Mastic

9" Beige/Black

Throughout Office Area - Under Carpeting and Drywall Walls

(The mastic was assumed based on previous positive sampling data from other floors)

Class II Category I - Non-Friable

14,250 SF

K Plaster White, Rough Fan Room - Walls, Ceiling, Columns and Beams Class I

Friable (RACM when

Removed)

2,200 SF

M Thermal System

Fittings 3"-6" OD, White

Fan Room and Throughout ceiling plenum and column chases on the perimeter of floor, inside large column chases in the middle of the floor, assumed in wall voids to sinks.

Class I Friable

(RACM when Removed)

270 SF (270

EA)

T Glazing White, Window

Throughout Windows

(Assumed based on previous positive sampling data)

Class II Category II - Non-Friable

2,050 SF

(Windows)

X Sealant Gray, Stairwell

Floor Stairwell Landing

204A Class II

Category I - Non-Friable

2 SF (24 LF)

Y Fireproofing Gray

Throughout on columns and beams and overspray on adjacent concrete decking. This material is over sprayed on plenum MEP fixtures, debris is on ceilings, light fixtures and window frames and is inside plaster column cavities.

Class I Friable

(RACM when Removed)

26,000 SF

ASBESTOS MATERIALS SUMMARY

HOMO.

ID

MATERIAL DESCRIPTION LOCATION

CAL/OSHA

CLASS

BAAD

CATEGORY

ESTIMATED

QUANTITY

AA Insulators Unknown, Electrical Switch Gear

Fan Room (Assumed because they were energized)

Class II Category II - Non-Friable

10 SF

ASBESTOS SAMPLING INVENTORY

HOMOGENEOUS ID MATERIAL DESCRIPTION # OF SAMPLES

A Wallboard/Joint Compound White/White, Walls 2

B Paint/Plaster White, Smooth, Walls, Ceilings &

Columns

C Mastic/Vinyl Floor Tile/Mastic Yellow, Carpet/9" Tan/Black 2

D Basecove/Mastic 4" Tan/Beige 2

E Vinyl Floor Tile/Mastic 12" Green/Yellow 1

F Basecove/Mastic 4" Green/Beige 1

G Mortar/Grout White/White, Ceramic Wall 1

H Mortar/Grout Gray/Gray, Ceramic Floor 1

I Not Used Not Used NA

J Fire Stop Red, Penetration 1

K Plaster White, Rough 2

L Jacketing Gray & White, Pipe 2

M Thermal System Fitting 3"-6" OD, White 3

N Sealant Gray, Duct, Outer Seam 1

O Sealant White, Duct, Inner Seam 1

P Sealant White, Duct, OUter Seam 1

Q Flex Connector Black 1

R Concrete Gray, Foundation 1

S Acoustic Ceiling Panel 2' X 2' White, Textured 1

T Glazing White, Window 1

U Mastic White, Sink 1

V Paint/Stucco Beige/Gray, Stairwell 2

ASBESTOS SAMPLING INVENTORY

HOMOGENEOUS ID MATERIAL DESCRIPTION # OF SAMPLES

W Coating Gray, Floor 1

X Sealant Gray, Stairwell Floor 1

Y Fireproofing Gray 7

Z Jacketing Gray & White, Pipe, New 1

AA Insulators Unknown, Electrical Switch Gear Assumed

CITY OF SEASIDE

FORMER FORT ORD - PHASE I

AREA 1: HARDSCAPE AND ROOFCITY OF SEASIDE

FORMER FORT ORD - PHASE I

AREA 1: HARDSCAPE AND ROOFCITY OF SEASIDE

FORMER FORT ORD - PHASE I

AREA 1: HARDSCAPE AND ROOF

CITY OF SEASIDE

FORMER FORT ORD - PHASE I

AREA 1: HARDSCAPE AND ROOF

ASBESTOS SAMPLING LOCATIONS

CITY OF SEASIDE

chris Typewriter chris Typewriter

SECOND FLOOR

SAMPLE LOCATION DRAWING

chris Typewriter

455 COUNTY CENTER

REDWOOD CITY

Alana.Anderson Callout Y04

Alana.Anderson Callout Y03

Alana.Anderson Callout Y02

Alana.Anderson Callout S02 Y01

Alana.Anderson Callout Y05

Alana.Anderson Callout Y06

Alana.Anderson Callout Y07

Alana.Anderson Callout V01 X01

Alana.Anderson Callout V02

Alana.Anderson Callout W01

Alana.Anderson Callout S01

Alana.Anderson Callout D02

Alana.Anderson Callout D01

Alana.Anderson Callout T02

Alana.Anderson Callout T01

Alana.Anderson Callout A02

Alana.Anderson Callout A01

Alana.Anderson Callout U01

Alana.Anderson Callout E01 F01

Alana.Anderson Callout G01 H01

Alana.Anderson Callout N01 O01 P01

Alana.Anderson Callout B03

Alana.Anderson Callout B01

Alana.Anderson Callout B02

Alana.Anderson Callout J01

Alana.Anderson Callout C01 C02

Alana.Anderson Callout R01

Alana.Anderson Callout K01

Alana.Anderson Callout K02

Alana.Anderson Callout K03

Alana.Anderson Callout Z01

Alana.Anderson Callout L01 L02

Alana.Anderson Callout Q01

Alana.Anderson Callout M01 M02 M03

Final Report

(EPA Method 40CFR, Part 763, Appendix E to Subpart E and EPA 600/R-93-116, Visual Area Estimation)

Bulk Asbestos Analysis NVLAP Lab Code: 101459-0

L1161Client ID:Vista Environmental Consultants B383994Report Number:Chris Burns

Date Received:2984 Teagarden St.

05/13/26Date Analyzed:

05/14/26Date Printed:San Leandro, CA 94577

First Reported:

L1161261101007 COB 1 2nd fl & Penthouse Survey SGSFL Job ID:Job ID/Site:

Date(s) Collected: 05/09/2026

43Total Samples Submitted:

Total Samples Analyzed: 43

05/11/26

05/14/26

Sample ID Lab Number Asbestos

Type Percent in

Layer Asbestos AsbestosPercent in Percent in

Type TypeLayer Layer

COB1-2-A01 12860522

Layer: White Drywall ND

Layer: White Joint Compound ND

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (20 %) Fibrous Glass (10 %)

COB1-2-A02 12860523

Layer: White Drywall ND

Layer: White Joint Compound ND

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (20 %) Fibrous Glass (10 %)

COB1-2-B01 12860524

Layer: White Plaster ND

Layer: White Skimcoat/Joint Compound ND

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-B02 12860525

Layer: White Plaster ND

Layer: White Skimcoat/Joint Compound ND

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-B03 12860526

Layer: White Plaster ND

Layer: White Skimcoat/Joint Compound ND

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

19743 Cabot Blvd., Hayward, CA 94545 | Phone: 510.887.8828 | https://www.sgs-ehsusa.com/

Report Number: B383994

Date Printed: 05/14/26Client Name: Vista Environmental Consultants

Sample ID Lab Number Asbestos

Type Percent in

Layer Asbestos AsbestosPercent in Percent in

Type TypeLayer Layer

COB1-2-C01 12860527

Layer: Brown Non-Fibrous Material ND

Layer: Brown Mastic ND

Layer: Grey Non-Fibrous Material ND

Layer: Brown Tile Chrysotile 2 %

Layer: Grey Cementitious Material ND

Layer: Black Mastic ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

Comment: Bulk complex sample.

COB1-2-C02 12860528

Layer: Brown Non-Fibrous Material ND

Layer: Brown Mastic ND

Layer: Grey Non-Fibrous Material ND

Layer: Grey Cementitious Material ND

Layer: Black Mastic ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

Comment: Bulk complex sample.

COB1-2-D01 12860529

Layer: Tan Non-Fibrous Material ND

Layer: Tan Mastic ND

Layer: White Skimcoat/Joint Compound ND

Layer: Brown Mastic ND

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

Comment: Bulk complex sample.

COB1-2-D02 12860530

Layer: Tan Non-Fibrous Material ND

Layer: Beige Mastic ND

Layer: White Skimcoat/Joint Compound ND

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-E01 12860531

Layer: Green Tile ND

Layer: Black Mastic ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-F01 12860532

Layer: Blue Green Non-Fibrous Material ND

Layer: Off-White Mastic ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

Sample ID Lab Number Asbestos

Type Percent in

Layer Asbestos AsbestosPercent in Percent in

Type TypeLayer Layer

COB1-2-G01 12860533

Layer: Off-White Grout ND

Layer: Off-White Mortar ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-H01 12860534

Layer: Off-White Grout ND

Layer: Off-White Mortar ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-J01 12860535

Layer: Red Non-Fibrous Material ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace) Fibrous Glass (Trace)

COB1-2-K01 12860536

Layer: Off-White Semi-Fibrous Material Chrysotile 2 %

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-K02 12860537

Layer: Off-White Semi-Fibrous Material Chrysotile 2 %

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-K03 12860538

Layer: Off-White Semi-Fibrous Material Chrysotile 2 %

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-L01 12860539

Layer: Yellow Fibrous Material ND

Layer: Paint ND

Layer: Beige Woven Material ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (10 %) Fibrous Glass (80 %)

COB1-2-L02 12860540

Layer: Yellow Fibrous Material ND

Layer: Paint ND

Layer: Beige Woven Material ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (10 %) Fibrous Glass (80 %)

Sample ID Lab Number Asbestos

Type Percent in

Layer Asbestos AsbestosPercent in Percent in

Type TypeLayer Layer

COB1-2-M01 12860541

Layer: Beige Semi-Fibrous Material Chrysotile Trace

Layer: Beige Woven Material ND

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-M02 12860542

Layer: Beige Semi-Fibrous Material Chrysotile Trace

Layer: Beige Woven Material ND

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-M03 12860543

Layer: Beige Semi-Fibrous Material Chrysotile Trace

Layer: Beige Woven Material ND

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-N01 12860544

Layer: Grey Non-Fibrous Material ND

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-O01 12860545

Layer: White Non-Fibrous Material ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-P01 12860546

Layer: White Non-Fibrous Material ND

Layer: Silver Non-Fibrous Material ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-Q01 12860547

Layer: Black Non-Fibrous Material ND

Layer: Silver Non-Fibrous Material ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-R01 12860548

Layer: Grey Cementitious Material ND

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

Sample ID Lab Number Asbestos

Type Percent in

Layer Asbestos AsbestosPercent in Percent in

Type TypeLayer Layer

COB1-2-S01 12860549

Layer: White Fibrous Material ND

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (35 %) Fibrous Glass (45 %)

COB1-2-T01 12860550

Layer: Grey Non-Fibrous Material ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-T02 12860551

Layer: Grey Non-Fibrous Material ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-U01 12860552

Layer: Grey Non-Fibrous Material ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-V01 12860553

Layer: Grey Cementitious Material ND

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-V02 12860554

Layer: Grey Cementitious Material ND

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-W01 12860555

Layer: Grey Coating ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-X01 12860556

Layer: Grey Non-Fibrous Material Chrysotile 2 %

Layer: Paint ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-Y01 12860557

Layer: Beige Non-Fibrous Material Chrysotile 2 %

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

Sample ID Lab Number Asbestos

Type Percent in

Layer Asbestos AsbestosPercent in Percent in

Type TypeLayer Layer

COB1-2-Y02 12860558

Layer: Beige Non-Fibrous Material Chrysotile 2 %

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-Y03 12860559

Layer: Beige Non-Fibrous Material Chrysotile 2 %

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-Y04 12860560

Layer: Beige Non-Fibrous Material Chrysotile 2 %

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-Y05 12860561

Layer: Beige Non-Fibrous Material Chrysotile 2 %

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-Y06 12860562

Layer: Beige Non-Fibrous Material Chrysotile 2 %

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-Y07 12860563

Layer: Beige Non-Fibrous Material Chrysotile 2 %

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (Trace)

COB1-2-Z01 12860564

Layer: White Semi-Fibrous Material ND

Layer: Foil ND

Layer: White Non-Fibrous Material ND

Layer: Yellow Fibrous Material ND

Total Percentage Values of Non-Asbestos Fibrous Components:

Cellulose (35 %) Fibrous Glass (55 %)

Inhomogeneous samples are separated into homogenous subsamples and analyzed individually. Analytical results and reports are generated by SGS at the request of and for the exclusive use of the person or entity (client) named on such report. Results, reports or copies of same will not be released by SGS to any third party without prior written request from client. This report applies only to the sample(s) tested. Supporting laboratory documentation is available upon request. This report must not be reproduced except in full, unless approved by SGS. The client is solely responsible for the use and interpretation of test results and reports requested from SGS. This report must not be used by the client to claim product endorsement by NVLAP or any other agency of the U.S. Government. SGS is not able to assess the degree of hazard resulting from materials analyzed. SGS reserves the right to dispose of all samples after a period of thirty (30) days, according to all state and federal guidelines, unless otherwise specified. All samples were received in acceptable condition unless otherwise noted.

Note: Limit of Quantification ('LOQ') = 1%. 'Trace' denotes the presence of asbestos below the LOQ. 'ND' = 'None Detected'.

Maria Cosper, Laboratory Supervisor, Hayward Laboratory

LEAD MATERIALS SUMMARY

Lead

ROOM COMPONENT SUBSTRATE COLOR CONDITION PB UNITS

Interior Upper Wall Plaster White Intact 0.2 mg/cm2

Interior Upper Wall Plaster White Intact 0.1 mg/cm2

Interior Upper Wall Plaster Lt-Blue Intact 0.2 mg/cm2

Interior Upper Wall Drywall Lt-Blue Intact 0.1 mg/cm2

Interior Upper Wall Drywall White Intact 0.1 mg/cm2

Interior Door Frame Metal White Intact 0.1 mg/cm2

Interior Column Plaster White Intact 0.1 mg/cm2

Interior Door Metal Beige Intact 5.5 mg/cm2

Interior Door Frame Metal White Intact 0.7 mg/cm2

Exterior Upper Wall Concrete Beige Intact 0.3 mg/cm2

Interior Radiator Metal White Intact 0.2 mg/cm2

Interior Window Sill Metal White Intact 0.3 mg/cm2

Interior Upper Wall Drywall Beige Intact 0.2 mg/cm2

Interior Lower Wall Ceramic White Intact 0.2 mg/cm2

Interior Lower Wall Ceramic Yellow Intact 0.4 mg/cm2

Interior Floor Ceramic Gray Intact 0.3 mg/cm2

Interior Floor Drain Metal Brass Intact 13 mg/cm2

Bold = Lead Based

Structural steel beams and columns that are under asbestos fireproofing are assumed to have lead-based paint on them.

455 County Center, Redwood City

Second Floor

XRF Sequential Report

READING

NO.

ROOM COMPONENT SUBSTRATE COLOR CONDITION RESULTS PbC UNITS

1 Calibrate Positive 1.1 mg/cm2

2 Calibrate Positive 1.1 mg/cm2

3 Calibrate Positive 1.1 mg/cm2

56 Interior Upper Wall Plaster White Intact Negative 0.2 mg/cm2

57 Interior Upper Wall Plaster White Intact Negative 0.1 mg/cm2

58 Interior Upper Wall Plaster Lt-Blue Intact Negative 0.2 mg/cm2

59 Interior Upper Wall Drywall Lt-Blue Intact Negative 0.1 mg/cm2

60 Interior Upper Wall Drywall White Intact Negative 0.1 mg/cm2

61 Interior Door Wood Varnish Intact Negative 0 mg/cm2

62 Interior Door Frame Metal White Intact Negative 0.1 mg/cm2

63 Interior Column Plaster White Intact Negative 0.1 mg/cm2

64 Interior Door Metal Beige Intact Positive 5.5 mg/cm2

65 Interior Door Frame Metal White Intact Negative 0.7 mg/cm2

66 Exterior Upper Wall Stucco Beige Intact Negative 0 mg/cm2

67 Exterior Upper Wall Concrete Beige Intact Negative 0.3 mg/cm2

68 Exterior Floor Concrete Gray Intact Negative 0 mg/cm2

69 Interior Radiator Metal White Intact Negative 0.2 mg/cm2

70 Interior Window Sill Metal White Intact Negative 0.3 mg/cm2

71 Interior Upper Wall Drywall Beige Intact Negative 0.2 mg/cm2

72 Interior Lower Wall Ceramic White Intact Negative 0.2 mg/cm2

73 Interior Lower Wall Ceramic Turquoise Intact Negative 0 mg/cm2

74 Interior Lower Wall Ceramic Yellow Intact Negative 0.4 mg/cm2

75 Calibrate Positive 1.2 mg/cm2

76 Calibrate Positive 1.2 mg/cm2

77 Calibrate Positive 1.1 mg/cm2

78 Interior Floor Ceramic Gray Intact Negative 0.3 mg/cm2

79 Interior Floor Drain Metal Brass Intact Positive 13 mg/cm2

This data is a screening of lead levels and provides results that are generally representative of typical conditions, but are not inclusive of all painted/coated surfaces at the Project Site. 1

455 County Center, Redwood City

Second Floor

XRF Sequential Report

READING

NO.

ROOM COMPONENT SUBSTRATE COLOR CONDITION RESULTS PbC UNITS

80 Interior Upper Wall Drywall Blue Intact Negative 0 mg/cm2

106 Calibrate Positive 1.1 mg/cm2

107 Calibrate Positive 1.1 mg/cm2

108 Calibrate Positive 1.1 mg/cm2

This data is a screening of lead levels and provides results that are generally representative of typical conditions, but are not inclusive of all painted/coated surfaces at the Project Site. 2

OTHER HAZARDOUS MATERIALS SUMMARY

Devices with Potential Hazardous Materials

MATERIAL CONTAMINANT ESTIMATED QUANTITY

Fluorescent Tubes (4' Length) Universal Waste 1,321

Batteries: Back-up & Exit Signs Universal Waste 10

Light Fixture Ballasts Polychlorinated Biphenyls 662