biddoc.pdf

PDF 4 MB Posted Sep 30, 2026

Attached to: Public Works PFAS Remediation
Solicitation number: 2026-0928
Issued by: Weld County, Colorado

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Written by GovTribe AI · Oct 2, 2026

This Request for Proposals (RFP) document is issued by the Town of Frederick, Colorado, for environmental remediation services at the Public Works property located at 7301 Eagle Boulevard, Frederick, Colorado. The Town seeks qualified firms to investigate, excavate, and remove per- and polyfluoroalkyl substances (PFAS)-impacted soils from the site, which was formerly used as a firefighting training facility where aqueous film forming foam (AFFF) was applied during training exercises. The scope of work includes property investigation, excavation of PFAS material, trucking, disposal fees, backfill and seeding, remediation sampling, and post-remediation investigation. The Phase II Environmental Site Assessment conducted by Smith Environmental & Engineering identified PFAS contamination confined to a small area around three sampling points (FP-1, FP-3, and FP-4) with soil boring investigations extending to approximately 10 feet below ground surface and an estimated vertical contamination extent of 3 feet. Questions regarding the RFP must be submitted by October 5, 2026, at 5:00 PM, with responses posted October 7, 2026, at 12:00 PM. Proposals are due October 9, 2026, at 2:00 PM, submitted electronically in PDF format to bvandyke@frederickco.gov. Interviews may be conducted, with notice of award expected October 14, 2026, and contract start within three weeks of award.

Evaluation of proposals will be weighted as follows: Qualifications & Experience (30%), Technical Approach (30%), Cost/Value (25%), and References & Past Performance (15%). Qualified proposers must demonstrate a minimum of five years of continuous experience in environmental investigation, remediation, and hazardous waste management, with documented completion of at least three PFAS-related projects within the past seven years, with at least one involving soil and/or groundwater remediation under state or federal oversight. The cost proposal may be submitted as a lump sum or hourly rates with a fee schedule and reimbursable expenses. The Town reserves the right to reject any or all proposals, waive minor irregularities, request additional information, negotiate scope and pricing with the selected proposer, and cancel the solicitation if in its best interest. The Town intends to award the contract to the responsible proposer offering the best overall value and is not obligated to select the lowest-cost proposal. No incumbent is identified, and funding source is not specified in the solicitation documents.

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7301 Eagle Blvd

Frederick, CO 80504

720.382.5806 bvandyke@frederickco.gov

Built on What Matters.

Request for Proposals

Project Information Project Title: Public Works – PFAS Remediation RFP Number: 2026-0930 Issue Date: 9/30/2026 Proposal Due Date/Time: 9/9/2026 2:00PM

Introduction The Town of Frederick is requesting proposals from interested vendors, consultants, contractors, organizations, or other entities capable of providing the services described in this Request for Proposals. The Town intends to select the proposal that represents the best overall value based on the evaluation criteria identified in this RFP.

Project Background The Town of Frederick has identified the presence of per- and polyfluoroalkyl substances (PFAS) at its Public Works property. In accordance with applicable state and federal environmental regulations and the Town’s commitment to protecting public health and the environment, the Town is soliciting proposals from qualified firms to conduct PFAS remediation activities at the site. The goal of this project is to remove impacted media in a manner that mitigates potential risks and supports the long-term safe use of the property

Scope of Work Investigate, excavate, and haul off all PFAS-impacted soils from the project site utilizing the attached Site Investigation and Remediation Recommendation.

Minimum Qualifications -Minimum of five (5) years of continuous experience providing environmental investigation, remediation, and/or hazardous waste management services.

- Demonstrated experience with at least three (3) completed PFAS-related projects (investigation, remediation, treatment, or disposal) within the past seven (7) years. At least one project should involve soil and/or groundwater remediation under state or federal oversight.

Proposal Requirements Cover Letter (firm information and primary contact) Firm Qualifications and Experience Project Approach and Methodology Project Team and Key Personnel Cost Proposal (lump sum or hourly rates, fee schedule, reimbursable expenses)

Evaluation Criteria

Criteria Weight Qualifications & Experience 30%

Technical Approach 30%

Cost / Value 25%

References & Past Performance 15%

Schedule

Milestone Date

RFP Issued 9/30/2026

Questions Due 10/5/2026 5:00PM

Responses Posted 10/7/2026 12:00PM

Proposal Due 10/9/2026 2:00PM

Interviews (if applicable)

Notice of Award 10/14/2026

Contract Start Within 3 weeks of award.

Questions Questions regarding this RFP shall be submitted via email to the Town's designated contact;

bvandyke@frederickco.gov. Responses will be shared with all known proposers.

Submission Instructions Submit proposals electronically in PDF format to bvandyke@frederickco.gov. Late proposals may not be considered.

Terms and Conditions Reject any or all proposals - The Town is not obligated to award a contract just because proposals were received. If none meet the Town's needs, the Town can reject them all and start over.

Waive informalities or minor irregularities - The Town may overlook small administrative mistakes that do not affect the fairness of the competition or the quality of the proposal.

Request additional information - If something in a proposal is unclear or incomplete, the Town may ask the proposer to clarify it before making a decision. This is not intended to allow proposers to completely rewrite their proposals.

Negotiate scope and pricing with the selected proposer - After selecting the highest-ranked proposer, the Town may negotiate the final scope of work, schedule, or price before executing a contract.

Cancel the solicitation if it is in the Town's best interest - The Town may stop the procurement at any time if circumstances change.

Award The Town intends to award a contract to the responsible proposer whose proposal provides the best overall value to the Town based on the evaluation criteria identified in this RFP. The Town is not required to select the lowest-cost proposal.

Attachments (as applicable) Scope Exhibits Sample Contract Insurance Requirements Maps/Plans Technical Specifications

Scope Exhibit

Item: Units: UOM: Cost

Property Investigation 1 LS

Excavation of PFAS Material DAYS

Trucking TRIPS

Disposal Fees 60 CY

Backfill and Seeding 60 CY

Remediation Sampling 8 EA

Post Remediation Investigation 1 LS

TOTAL

Spaces have been left for additional items, quantities, and UOMs to be added. Please provide reasoning for all added items.

Maps/Plans

PFAS Site Assessment and Remediation Recommendation:

Phase II Environmental Site Assessment and Remediation Recommendations

7301 Eagle Blvd.

Frederick Colorado

Prepared for the Town of Frederick by Smith Environmental & Engineering

September 5, 2024

W W W. S M I T H D E L I V E R S. C O M 250 Perry Lane Dacono, CO 80514 phone: 720.887.4928 fax: 720.887.4680

Smith Environmental and Engineering Delivering Sustainable Environmental Solutions

SMITH ENVIRONMENTAL & ENGINEERING

Phase II Environmental Site Assessment and remediation recommendations 7301 Eagle Blvd.

Frederick, Colorado 80530

Prepared for:

Town of Frederick 401 Locust St.

Frederick, Colorado 80530

Prepared by:

Smith Environmental and Engineering 250 Perry Lane

Dacono, CO 80514

SMITH Project No. 2024-2324

September 5, 2024

TABLE OF CONTENTS

INTRODUCTION

1.1 PHYSICAL SETTING

1.2 SITE HISTORY AND LAND USE

METHODS

2.1 FIELD INVESTIGATION

2.2 LABORATORY ANALYTICAL METHODS

RESULTS AND DISCUSSION

3.1 SOIL ANALYTICAL RESULTS

CONCLUSIONS AND REMEDIATION RECOMMENDATIONS

4.1 REMEDIATION CONSIDERATONS

4.2 RECOMMENDATIONS

5.0 REFERENCES

FIGURES

FIGURE 1 SITE LOCATION MAP

FIGURE 2 APRIL 2024 SOIL BORING LOCATIONS

FIGURE 3 JUNE 2024 SOIL BORING LOCATIONS

TABLES

TABLE 1 NON PFAS ANALYTICAL RESULTS SUMMARY

TABLE 2 PFAS ANALYTICAL RESULTS SUMMARY

APPENDICES

APPENDIX A SOIL ANALYTICAL LABORATORY REPORTS

INTRODUCTION

In July 2024 Smith Environmental and Engineering (SMITH) was retained by the Town of Frederick to conduct an additional Phase II Environmental Site Assessment (Phase II ESA) at a portion of the property located at 7301 Eagle Blvd., Frederick, Colorado 80530 (see Figure 1). The site was used historically as a firefighting training facility and aqueous film forming foam (AFFF) was used in training exercises. The Town of Frederick (Town) owns the Site. AFFF is a type of foam that fire departments use to fight liquid-based fires (i.e., those started by oil, gasoline, or other flammable liquids). AFFF is known to contain per-and polyfluoroalkyl substances (PFAS). One drum of AFFF was stored at the Site. Herein, this former training facility is referred to as the Site.

The firefighting training structures existed at the Site from 2020-2023 but were removed before this investigation. All that remains are several 8 ft by 15 ft concrete pads that surrounded the former metal structures. The metal structures sat on crushed asphalt gravel surrounded by concrete pads (see Photograph 1).

During a 2023 site investigation conducted by ERM (2023), they collected and analyzed soil samples from the perimeter of the metal structures and found that FP-1, FP-3, and FP-4 contained PFAS compound above laboratory detection limits. The location of FP-1, FP-3, and FP-4 and the structures are shown in Photographs 1-3 below. U.S. Environmental Protection Agency (USEPA) Residential Regional Screening (Cleanup) Levels (RSL) (USEPA 2021) for PFAS do not exist, therefore, any value above detection limits is regarded as a potential health and safety risk. No recommendations were made in the ERM (2023) report regarding remediation of the Site. The purpose of the ERM (2033) investigation was to confirm absence/presence of PFAS at the Site, not to determine the horizontal and vertical extent.

The Site about covers 0.3 acre of land.

The purpose of this additional Phase II ESA investigation is to determine the horizontal and vertical extent of the PFAS compounds given the documented existence of PFAS compounds at FP-1, FP-3, and FP-4, and make remediation recommendations.

Eagle Blvd

Carbide St

Source: Esri, Maxar, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community

Smith Environmental and Engineering

250 Perry Lane Dacono, Colorado 80514

(720) 887-4928, (720) 887-4680 (fax)

Figure 1 Study Area

Frederick, Colorado August 2024

7301 EAGLE BOULEVARD

0 100 200

Feet

Legend Former Fire Department Training Facility

Weld County, Colorado

Area of interest

1.1 PHYSICAL SETTING

The Site is on the Frederick, CO, United States Geological Survey (USGS) Topographic Quadrangle (USGS 1994) and is located just West of the Town of Frederick’s Public Utilities buildings in Weld County, Colorado.

The site topography is smooth and has slope of approximately 2 percent, sloping to the West. It lies at an elevation of approximately 4,962 ft above mean sea level. A small man-made drainage approximately four ft deep and 15 ft wide lies immediately to the South of the Site.

Soils are mapped and classified by the Natural Resources Conservation Service (NRCS) (2024) in and around the Site and consist of eolian silt and clay with some sand. They are classified as Onley fine sandy loam, 1-3% slopes. Caution should be used, however, when assuming these mapped soils are at the Site.

The USDA warns that Web Soil Survey mapping may not be accurate for areas as small as 0.3 ac and further warns that to assume the mapping is accurate is a misuse of Web Soil Survey data (NRCS 2024).

Groundwater flow at the Site is assumed to be towards the West, the direction of the surface flow and topography.

1.2 SITE HISTORY AND LAND USE

The Town has used the Site to store materials and old equipment associated with their Public Works facility. Prior to the Town owning the Site, the land was used for agricultural purposes – cropland and pasture.

Vacant Lot Vacant Lot

Vacant Lot

METHODS

A field investigation was conducted, and soil samples collected of the Site. Samples were collected from hand augered soil borings and taken to the laboratory for analyses and are the basis for conclusions in this report. All field activities were completed in accordance with SMITH’s Corporate Health and Safety Manual (SMITH 2023).

2.1 FIELD INVESTIGATION

Soil borings were completed by a stainless-steel hand auger to sample and determine the extent of PFAS compounds (only) beyond FP-1, FP-3, and FP-4. Texture was determined and profiles were described according to the standards of the Soil Survey Manual (USDA 1993). A nearby Phase II ESA investigation (SMITH 2023) showed bedrock in the area at 16-18 bgs, therefore, this investigation would probably not encounter bedrock making it a hydro pedologic, not a hydrogeologic investigation. Therefore, the methods of the Soil Survey Manual (USDA 1993) are followed because this was a hydro pedologic investigation. Composite soil sample was collected for every 40 in. interval in the soil profile.

The soil samples collected for laboratory analyses were immediately placed in laboratory-supplied pre labeled sample containers, then placed in an ice-filled cooler for transport to the laboratory under appropriate chain-of-custody protocols for laboratory analyses. Elevation Diagnostics, Division of Environmental Testing (Elevation) in Aurora, Colorado, a USEPA certified laboratory, performed the analyses according to U.S. EPA Method 1633 (USEPA 2024) for 40 PFAS related analytes.

2.2 LABORATORY ANALYTICAL METHODS

Laboratory analyses were completed for the following PFAS analytes by Elevations:

• Perfluorobutanoic acid (PFBA)

• Perfluoropentanoic acid (PFPeA)

• Perfluorohexanoic acid (PFHxA)

• Perfluoroheptanoic acid (PFHpA)

• Perfluorooctanoic acid (PFOA)

• Perfluorononanoic acid (PFNA)

• Perfluorodecanoic acid (PFDA)

• Perfluoroundecanoic acid (PFUnA)

• Perfluorododecanoic acid (PFDoA)

• Perfluorotridecanoic Acid (PFTrDA)

• Perfluorotetradecanoic acid (PFTeDA)

• Perfluorooctanesulfonamide (PFOSA)

• N-Methyl perfluorooctane sulfonamide (NMeFOSA)

• N-Ethyl perfluorooctane sulfonamide (NEtFOSA)

• N-methyl perfluorooctane sulfonamidoacetic acid (NMeFOSAA)

• N-ethyl perfluorooctane sulfonamidoacetic acid (NEtFOSAA)

• N-Methyl perfluorooctane sulfonamidoethanol (NMeFOSE)

• N-Ethyl perfluorooctane sulfonamidoethanol (NEtFOSE)

• Hexafluoropropylene oxide dimer acid (HFPO-DA)

• Perfluoro-3-methoxypropanoic acid (PF4OPeA)

• Perfluoro-4-methoxybutanoic acid (PF5OHxA)

• Perfluoro-3,6-dioxaheptanoic acid (3,6-OPFHpA)

• 3-Fluoropropyl propanoic acid (FPrPA)

• 3- (4-Fluorophenethoxy) propanoic acid (FPePA)

• 3-Perfluoroheptyl propanoic acid (FHpPA)

• Perfluorobutanesulfonic acid (PFBS)

• Perfluoropentanesulfonic acid (PFPeS)

• Perfluorohexanesulfonic acid (PFHxS)

• Perfluoroheptanesulfonic Acid (PFHpS)

• Perfluorooctanesulfonic acid (PFOS)

• Perfluorononanesulfonic acid (PFNS)

• Perfluorodecanesulfonic acid (PFDS)

• Perfluorododecanesulfonic acid (PFDoS)

• 1H, 1H, 2H, 2H-Perfluorohexane sulfonic acid (4:2FTS)

• 1H, 1H, 2H, 2H-Perfluorooctane sulfonic acid (6:2 FTS)

• 1H, 1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2FTS)

• 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)

• 9-Chlorohexadecafluoro-3-oxanonane-1- sulfonic acid (9Cl-PF3ONS)

• 11-Chloroeicosafluoro-3-oxaundecane-1- sulfonic acid (11Cl- PF3OUdS)

• Perfluoro(2-ethoxyethane) sulfonic acid (PFEESA)

RESULTS AND DISCUSSION

A total of eight soil borings (SB-1 through SB-8) were completed to a depth of ten feet below ground surface (bgs) for this investigation. These boring locations are positioned 10 to 40 ft up gradient and down gradient of FP-1, FP-3, and FP-4 locations to ensure an understanding of the horizontal and vertical extent of the PFAS analytes bgs. The soil samples were collected from 40-in. intervals, therefore a total of twenty-four samples were collected and analyzed. The location of these borings is shown in Figure 2.

Groundwater was encountered in all the borings between 85 in. and 113 in. bgs. Bedrock was not encountered above 10 ft bgs. Soil textures encountered included silty clay loam, fine sandy loam, loam, very fine sandy loam, silt loam, typical of finer textured eolian material.

3.1 SOIL ANALYTICAL RESULTS

A summary of the laboratory analyses is presented in Table 1 and the detailed laboratory reports are included in Appendix A.

None of the eight borings and twenty-four samples showed PFAS analyte levels above laboratory detection limits. Therefore, the extent of PFAS contamination, only detected by ERM (2023), is confined to a small area. And the proposed remediation area is centered on FP-01, FP-03, and FP-04 – see Figure 2 and Photographs 1-3. ERM sampling extended to 3 ft bgs so the vertical extent of PFAS contamination is not known in the proposed remediation area, but it is believed to be 3 ft bgs based on the eight borings by SMITH.

SB8

SB7

SB6

SB5

SB4

SB3

SB2

SB1

Source: Esri, Maxar, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community

Smith Environmental and Engineering

250 Perry Lane Dacono, Colorado 80514

(720) 887-4928, (720) 887-4680 (fax)

Figure 2 Soil Boring Locations and

Remediation Area August 2024

7301 EAGLE BOULEVARD

0 30 60

Feet

Legend Soil Boring

Remediation Area

FP-01

FP-02

FP-03

FP-04

Study AreaStudy Area

Direction of Groundwater Flow

Direction of Groundwater Flow petersmith Oval petersmith Oval petersmith Line petersmith Line petersmith Oval petersmith Oval

TABLE 1: PFAS Components Analytical Results Summary

PFAS

Component Units

Detection Limit

SB1

18-39

SB1

39-78

SB1

78-120

SB2

0-39

SB2

39-78

SB2

79-120

PFBA ng/g 2.68 ND ND ND ND ND ND PFPeA ng/g 1.59 ND ND ND ND ND ND PFHxA ng/g 0.91 ND ND ND ND ND ND PFHpA ng/g 1.29 ND ND ND ND ND ND PFOA ng/g 2.36 ND <2.36 ND <2.36 ND ND PFNA ng/g 5.11 ND ND ND ND ND ND PFDA ng/g 1.17 ND ND ND ND ND ND PFUdA ng/g 1.32 ND ND ND ND ND ND PFDoA ng/g 0.81 ND ND ND ND ND ND PFTrDA ng/g 0.82 ND ND ND ND ND ND PFTeDA ng/g 0.73 <0.73 ND ND ND ND ND FOSA ng/g 0.62 ND ND ND ND ND <0.62 N-MeFOSA ng/g 0.97 ND ND ND ND ND ND N-EtFOSA ng/g 2.35 ND ND ND ND ND ND N-MeFOSAA ng/g 1.78 ND ND ND ND ND ND N-EtFOSAA ng/g 1.96 ND ND ND ND ND ND N-MeFOSE ng/g 4.12 ND ND ND ND ND ND N-EtFOSE ng/g 6.67 ND ND ND ND ND ND HFPO-DA ng/g 4.56 ND ND ND ND ND ND PF4OPeA ng/g 1.96 ND ND ND ND ND ND PF5OHxA ng/g 1.56 ND ND ND ND ND ND 3,6-OPFHpA ng/g 1.87 ND <1.87 <1.87 ND ND ND FPrPA ng/g 5.01 ND ND <5.01 ND ND ND FPePA ng/g 14.93 ND ND ND ND ND ND FHpPA ng/g 14.51 ND ND ND ND ND ND PFBS ng/g 0.97 ND ND ND ND ND ND PFPeS ng/g 1.16 ND ND ND ND ND ND PFHxS ng/g 1.10 <1.10 ND <1.10 <1.10 ND ND PFHpS ng/g 0.60 ND ND ND ND ND ND PFOS ng/g 1.27 ND ND ND ND ND ND PFNS ng/g 0.96 ND ND ND ND ND ND PFDS ng/g 1.08 ND ND ND ND ND ND PFDoS ng/g 1.15 ND ND ND ND ND ND 4:2FTS ng/g 2.12 ND <2.12 ND ND <2.12 ND 6:2FTS ng/g 4.33 ND ND ND ND <4.33 ND 8:2FTS ng/g 3.34 ND ND ND ND ND ND ADONA ng/g 3.05 ND ND ND ND ND ND 9Cl-PF3ONS ng/g 2.38 ND ND ND ND ND ND 11Cl-PF3OUdS ng/g 3.36 ND ND ND ND ND ND PFEESA ng/g 1.90 ND ND ND ND ND ND ND - Not Detected SB - soil boring; 18-39 - 18 in. to 39 in. (sampling interval)

TABLE 1: PFAS Components Analytical Results Summary (continued)

Component Units

Detectio n Limit

SB3

4-39

SB3

39-78

SB3

79-120

SB4 8-

SB4

39-78

SB4

79-120

PFBA ng/g 2.68 ND ND ND ND ND ND PFPeA ng/g 1.59 ND ND ND <1.59 ND ND PFHxA ng/g 0.91 ND ND ND ND ND ND PFHpA ng/g 1.29 ND ND ND ND ND ND PFOA ng/g 2.36 ND ND ND ND ND ND PFNA ng/g 5.11 ND ND ND ND ND ND PFDA ng/g 1.17 ND ND ND ND ND ND PFUdA ng/g 1.32 ND ND ND ND ND ND PFDoA ng/g 0.81 ND ND ND ND ND ND PFTrDA ng/g 0.82 ND ND ND ND ND ND PFTeDA ng/g 0.73 ND ND ND ND ND ND FOSA ng/g 0.62 ND ND ND <0.62 ND ND N-MeFOSA ng/g 0.97 ND ND ND ND ND ND N-EtFOSA ng/g 2.35 ND ND ND ND ND ND N-MeFOSAA ng/g 1.78 ND ND ND ND ND ND N-EtFOSAA ng/g 1.96 ND ND ND ND ND ND N-MeFOSE ng/g 4.12 ND ND ND ND ND ND N-EtFOSE ng/g 6.67 ND ND ND ND ND ND HFPO-DA ng/g 4.56 ND ND ND ND ND ND PF4OPeA ng/g 1.96 ND ND ND ND ND ND PF5OHxA ng/g 1.56 ND ND ND ND ND ND 3,6-OPFHpA ng/g 1.87 <1.87 ND ND ND <1.87 ND FPrPA ng/g 5.01 ND ND ND ND ND ND FPePA ng/g 14.93 ND ND ND ND ND ND FHpPA ng/g 14.51 ND ND ND ND ND ND PFBS ng/g 0.97 ND ND ND ND ND ND PFPeS ng/g 1.16 ND ND ND ND ND ND PFHxS ng/g 1.10 ND <1.10 <1.10 <1.10 ND <1.10 PFHpS ng/g 0.60 ND ND ND ND ND ND PFOS ng/g 1.27 ND ND ND ND ND ND PFNS ng/g 0.96 ND ND ND ND ND ND PFDS ng/g 1.08 ND ND ND ND ND ND PFDoS ng/g 1.15 ND ND ND ND ND ND 4:2FTS ng/g 2.12 ND ND ND ND ND ND 6:2FTS ng/g 4.33 ND ND ND ND ND ND 8:2FTS ng/g 3.34 ND ND ND ND ND ND ADONA ng/g 3.05 ND ND ND ND ND ND 9Cl-PF3ONS ng/g 2.38 ND ND ND ND ND ND 11Cl-PF3OUdS ng/g 3.36 ND ND ND ND ND ND PFEESA ng/g 1.90 ND ND ND ND ND ND

Component Units

Detection Limit

SB5

10-39

SB5

39-78

SB 5

79-120

SB6

4-39

SB6

39-79

SB6

79-120

PFBA ng/g 2.68 ND ND ND ND ND ND PFPeA ng/g 1.59 ND ND ND ND ND ND PFHxA ng/g 0.91 ND ND ND ND ND ND PFHpA ng/g 1.29 ND ND ND ND ND ND PFOA ng/g 2.36 <2.36 ND ND ND ND ND PFNA ng/g 5.11 ND ND ND ND ND ND PFDA ng/g 1.17 ND ND ND ND ND ND PFUdA ng/g 1.32 ND ND ND ND ND ND PFDoA ng/g 0.81 ND ND ND ND ND ND PFTrDA ng/g 0.82 ND ND ND ND ND ND PFTeDA ng/g 0.73 ND ND ND ND ND ND FOSA ng/g 0.62 ND ND ND ND ND ND N-MeFOSA ng/g 0.97 ND ND ND ND ND ND N-EtFOSA ng/g 2.35 ND ND ND ND ND ND N-MeFOSAA ng/g 1.78 ND ND ND ND ND ND N-EtFOSAA ng/g 1.96 ND ND ND ND ND ND N-MeFOSE ng/g 4.12 ND ND ND ND ND ND N-EtFOSE ng/g 6.67 ND ND ND ND ND ND HFPO-DA ng/g 4.56 ND ND ND ND ND ND PF4OPeA ng/g 1.96 ND ND ND ND ND ND PF5OHxA ng/g 1.56 <1.56 ND ND ND ND ND 3,6-OPFHpA ng/g 1.87 ND <1.87 ND ND ND ND FPrPA ng/g 5.01 ND ND ND ND ND <5.01 FPePA ng/g 14.93 ND ND ND ND ND ND FHpPA ng/g 14.51 ND ND ND ND ND ND PFBS ng/g 0.97 ND ND ND ND ND ND PFPeS ng/g 1.16 ND ND ND ND ND ND PFHxS ng/g 1.10 <1.10 <1.10 <1.10 <1.10 <1.10 <1.10 PFHpS ng/g 0.60 ND ND ND ND ND ND PFOS ng/g 1.27 ND ND ND <1.27 ND ND PFNS ng/g 0.96 ND ND ND ND ND ND PFDS ng/g 1.08 ND ND ND <1.08 ND ND PFDoS ng/g 1.15 ND ND ND ND ND ND 4:2FTS ng/g 2.12 ND ND ND ND ND ND 6:2FTS ng/g 4.33 ND ND ND ND ND ND 8:2FTS ng/g 3.34 ND ND ND ND ND ND ADONA ng/g 3.05 ND ND ND ND ND ND 9Cl-PF3ONS ng/g 2.38 ND ND ND ND ND ND 11Cl-PF3OUdS ng/g 3.36 ND ND ND ND ND ND PFEESA ng/g 1.90 ND ND ND ND ND ND

Component Units

Detection Limit

SB7

10-39

SB7

39-78

SB7

78-120

SB8

15-39

SB8

39-78

SB8

79-120

PFBA ng/g 2.68 ND ND ND ND ND ND PFPeA ng/g 1.59 ND ND ND ND ND ND PFHxA ng/g 0.91 ND ND ND ND ND ND PFHpA ng/g 1.29 ND ND ND ND ND ND PFOA ng/g 2.36 ND ND ND ND ND ND PFNA ng/g 5.11 ND ND ND ND ND ND PFDA ng/g 1.17 ND ND ND ND ND ND PFUdA ng/g 1.32 ND ND ND ND ND ND PFDoA ng/g 0.81 ND ND ND ND ND ND PFTrDA ng/g 0.82 ND ND ND ND ND ND PFTeDA ng/g 0.73 ND ND ND ND ND ND FOSA ng/g 0.62 ND ND ND ND ND ND N-MeFOSA ng/g 0.97 ND ND ND ND ND ND N-EtFOSA ng/g 2.35 ND ND ND ND ND ND N-MeFOSAA ng/g 1.78 ND ND ND ND ND ND N-EtFOSAA ng/g 1.96 ND ND ND ND ND ND N-MeFOSE ng/g 4.12 ND ND ND ND ND ND N-EtFOSE ng/g 6.67 ND ND ND ND ND ND HFPO-DA ng/g 4.56 ND ND ND ND ND ND PF4OPeA ng/g 1.96 ND ND ND ND ND ND PF5OHxA ng/g 1.56 ND ND ND <1.56 ND ND 3,6-OPFHpA ng/g 1.87 ND ND <1.87 ND <1.87 <1.87 FPrPA ng/g 5.01 ND ND <5.01 ND <5.01 ND FPePA ng/g 14.93 ND ND ND ND ND ND FHpPA ng/g 14.51 ND ND ND ND ND ND PFBS ng/g 0.97 ND ND ND ND ND ND PFPeS ng/g 1.16 ND ND ND ND ND ND PFHxS ng/g 1.10 <1.10 <1.10 <1.10 <1.10 ND <1.10 PFHpS ng/g 0.60 ND ND ND ND ND ND PFOS ng/g 1.27 ND ND ND ND ND ND PFNS ng/g 0.96 ND ND ND ND ND ND PFDS ng/g 1.08 ND ND ND ND ND ND PFDoS ng/g 1.15 ND ND ND ND ND ND 4:2FTS ng/g 2.12 ND ND ND ND ND ND 6:2FTS ng/g 4.33 ND ND ND ND ND <4.33 8:2FTS ng/g 3.34 ND <3.34 ND ND ND <3.34 ADONA ng/g 3.05 ND ND ND ND ND ND 9Cl-PF3ONS ng/g 2.38 ND ND ND ND ND ND 11Cl-PF3OUdS ng/g 3.36 ND ND ND ND ND ND PFEESA ng/g 1.90 ND ND ND ND ND ND

CONCLUSIONS AND REMEDIATION RECOMMENDATIONS

None of the eight borings completed by SMITH or the twenty-four samples analyzed by Elevations showed PFAS analyte levels above laboratory detection limits. These borings and laboratory results confirm the PFAS contamination is limited to a small area approximately 30 ft long (N-S) and 20 ft wide (E-W), about 500 sq ft. While there are no published RSL levels for PFAS compounds, SMITH believes the USEPA and Colorado Department of Public Health and Environment will regard a site with PFAS compound levels below laboratory detection limits as not requiring any cleanup.

The extent of PFAS contamination, only detected by ERM (2023), is confined to a small area (Remediation Area) shown in Figure 2. The proposed Remediation Area is centered on FP-01, FP-03, and FP-04 but because ERM sampling extended only to 3 ft bgs, the vertical extent of PFAS contamination is not known in the proposed Remediation Area.

4.1 REMEDIATION CONSIDERATONS

SMITH's preliminary estimate is that there is approximately sixty (60) cubic yards, or about one hundred

(100) tons, of PFAS contaminated soil at the Site. There are no facilities, currently, in Colorado that are receiving PFAS contaminated soil. The nearest facility we have located that will receive PFAS contaminated soil is in Grand View, Idaho, where the cost is $300/ton. The cost for trucking of the material is estimated at $100/ton to Kimball, NE, and five times that to Gand View, ID. If incineration is considered as a remediation alternative, the cost for incineration is approximately the same as landfill disposal, but at an incineration facility in Kimball, NE.

4.2 RECOMMENDATIONS

SMITH recommends excavation and removal of the soil to a depth of three feet bgs in the proposed Remediation Area. SMITH further recommends, after this excavation is completed, that confirmation sampling be conducted just outside the excavated area to confirm PFAS compound levels below laboratory detection limits. This would include sampling just below the excavated area to confirm there is no contamination deeper than three feet bgs. Also, the concrete pads shown in Photographs 1-3 will need to be removed as part of the remediation excavation effort.

SMITH recommends incineration of the soil as that will eliminate the PFAS compounds, whereas landfill disposal of PFAS contaminated soil does not provide a long-term solution. PFAS compounds are called forever chemicals because they persist for extraordinarily prolonged periods of time in soil and water.

Soil incineration is considered a more sustainable solution to this contamination problem.

5.0 REFERENCES

ERM. 2023. Soil Sampling Results, 7301 Eagle Blvd. Frederick, CO. Prepared for Agilent Technologies.

ERM, Denver, Colorado

NRCS. 2024. United States Department of Agriculture, Web Soil Survey. Available online at:

http://websoilsurvey.nrcs.usda.gov/ Accessed July 1, 2024.

SMITH. 2023. Limited Phase II ESA, 7400 Eagle Blvd. Prepared for the Town of Frederick, February 3, 2023. Dacono, CO

USDA. 1993. Soil Survey Manual, USDA Handbook 18. USGPO, Washington D.C.

USEPA. 2021. Regional Screening Levels - May 2021. Environmental Protection Agency. Washington, DC.

USEPA. 2024. Method 1633 - Analysis of Per- and Polyfluoroalkyl Substances (PFAS) in Aqueous, Solid, Biosolids, and Tissue Samples by LC-MS/MS. EPA 821-R-24-001. USEPA, Office of Science and Technology, Washington, D.C.

USGS. 1994. Frederick 7.5 Minute Quadrangle. USGS, Reston, Virgina.

http://websoilsurvey.nrcs.usda.gov/

APPENDIX A

Soil Analytical Laboratory Reports

Division of Environmental Testing 2115 N Scranton St Suite 3040A

Aurora, CO 80045

800-440-5184

Attached are the analytical results for 2024-2324 Task 1 N/A received by Elevation Diagnostics, Division of Environmental Testing on July 24, 2024. This is associated with Elevation's number AA10458 .

The results were analyzed under the guidelines of various methods. These methods are identified in the report as follows: "SW" is referring to the EPA's SW-846 Compendium; "EPA" is referring to 40 CFR part 136; "HACH" is referring to a method which was validated by HACH®; "SM" is referring to a revision of the Standard Methods For the Examination of Water and Wastewater; and

"ASTM" is referring to the standard test method set forth by ASTM International.

The analytical results in this report apply specifically to the samples listed in the attached Chain of Custody. This report may only be duplicated in full.

Any deviations to sample integrity, method specifications, or Elevation Diagnostics's standard operating procedures are documented in the report below.

Please contact us for any questions or comments concerning the content of this report.

Thank you, Elevation Diagnostics, Division of Environmental Testing

250 Perry Lane

Dacono, CO 80514

303-551-7981

August 12, 2024

Project Number :

Project Name :

Project Manager : Kalvin Andrade & Peter Smith

2024-2324 Task 1

N/Adejansmaic@smithdelivers.com

Page 1 of 41Report #2439 Not previously reported

The results listed pertain only to the samples submitted to Elevation Diagnostics, Division of Environmental

Testing as per the Chain of Custody attached. This report may only be duplicated in full.Report #2439 Not previously reported

The results listed pertain only to the samples submitted to Elevation Diagnostics, Division of Environmental

Testing as per the Chain of Custody attached. This report may only be duplicated in full.Report #2439 Not previously reported

The results listed pertain only to the samples submitted to Elevation Diagnostics, Division of Environmental

Testing as per the Chain of Custody attached. This report may only be duplicated in full. Page 4 of 41Report #2439 Not previously reported

FINAL RESULTS REPORT

Report Date : 8/12/2024

20:40Report Time :

Kalvin Andrade & Peter SmithProject Manager: Project Name: Project Number:

Division of Environmental Testing 2115 N Scranton St Suite 3040A

Aurora, CO 80045

800-440-5184

2024-2324 Task 1 N/A

Result Units Sample ID Collected

Analysis Start Dilution

Method Ref.Customer ID

Analyte Name Recovery

MDL

AA10458-1 Collected : 07/22/2024 12:00SB1: 18'-39'

3.36 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - 11Cl-PF3OUdS

1.87 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - 3,6-OPFHpA

2.12 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - 4:2FTS

4.33 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - 6:2FTS

3.34 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - 8:2FTS

2.38 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - 9Cl-PF3ONS

3.05 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - ADONA

14.51 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - FHpPA

0.62 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - FOSA

14.93 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - FPePA

5.01 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - FPrPA

4.56 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - HFPO-DA

2.35 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - N-EtFOSA

1.96 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - N-EtFOSAA

6.67 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - N-EtFOSE

0.97 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - N-MeFOSA

1.78 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - N-MeFOSAA

4.12 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - N-MeFOSE

1.96 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PF4OPeA

1.56 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PF5OHxA

2.68 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFBA

0.97 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFBS

1.17 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFDA

0.81 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFDoA

1.15 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFDoS

1.08 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFDS

1.90 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFEESA

1.29 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFHpA

0.60 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFHpS

0.91 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFHxA

1.10 EPA 1633<1.10 ng/g08/12/2024 13:54PFAS, Soil - PFHxS

5.11 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFNA

0.96 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFNS

2.36 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFOA

1.27 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFOS

1.59 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFPeA

1.16 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFPeS

0.73 EPA 1633<0.73 ng/g08/12/2024 13:54PFAS, Soil - PFTeDA

0.82 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFTrDA

1.32 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - PFUdA

The results listed pertain only to the samples submitted to Elevation Diagnostics, Division of Environmental

Testing as per the Chain of Custody attached. This report may only be duplicated in full.Report #2439 Not previously reported

20:40Report Time :

Kalvin Andrade & Peter SmithProject Manager: Project Name: Project Number:

Division of Environmental Testing 2115 N Scranton St Suite 3040A

Aurora, CO 80045

800-440-5184

2024-2324 Task 1 N/A

Result Units Sample ID Collected

Analysis Start Dilution

Method Ref.Customer ID

Analyte Name Recovery

MDL

d3-N-MeFOSAAIS - ng/g 46.50008/12/2024 13:54 4.65 d5-N-EtFOSAAIS - ng/g 64.10008/12/2024 13:54 6.41 d7-N-MeFOSEIS - ng/g 101.120008/12/2024 13:54 50.56 d9-N-EtFOSEIS - ng/g 96.820008/12/2024 13:54 48.41 d-N-EtFOSAIS - ng/g 103.0008/12/2024 13:54 5.15 d-N-MeFOSAIS - ng/g 88.60008/12/2024 13:54 4.43

M2-4:2 FTSIS - ng/g 102.90008/12/2024 13:54 10.29

M2-6:2 FTSIS - ng/g 106.70008/12/2024 13:54 10.67

M2-8:2 FTSIS - ng/g 105.80008/12/2024 13:54 10.58

M2PFTeDAIS - ng/g 95.20008/12/2024 13:54 2.38

M3HFPO-DAIS - ng/g 82.550008/12/2024 13:54 16.51

M3PFBSIS - ng/g 98.60008/12/2024 13:54 4.93

M3PFHxSIS - ng/g 123.0008/12/2024 13:54 6.15

M4PFHpAIS - ng/g 121.40008/12/2024 13:54 6.07

M5PFHxAIS - ng/g 120.20008/12/2024 13:54 6.01

M5PFPeAIS - ng/g 100.10008/12/2024 13:54 10.01

M6PFDAIS - ng/g 83.60008/12/2024 13:54 2.09

M7PFUdAIS - ng/g 97.20008/12/2024 13:54 2.43

M8FOSAIS - ng/g 78.0008/12/2024 13:54 3.90

M8PFOAIS - ng/g 122.80008/12/2024 13:54 6.14

M8PFOSIS - ng/g 99.60008/12/2024 13:54 4.98

M9PFNAIS - ng/g 97.60008/12/2024 13:54 2.44

MPFBAIS - ng/g 79.450008/12/2024 13:54 15.89

MPFDoAIS - ng/g 81.840008/12/2024 13:54 10.23

AA10459-1 Collected : 07/22/2024 12:00SB1: 39'-78'

3.36 EPA 1633Not Detected ng/g08/12/2024 13:54PFAS, Soil - 11Cl-PF3OUdS

1.87 EPA 1633<1.87 ng/g08/12/2024 13:54PFAS, Soil - 3,6-OPFHpA

2.12 EPA 1633<2.12 ng/g08/12/2024 13:54PFAS, Soil - 4:2FTS