1515 Clay Street, Suite 1400

May 8, 2020

Ms. Alyx Karpowicz

California Regional Water Quality Control Board

San Francisco Bay Region (RWQCB)

1515 Clay Street, Suite 1400

Oakland, CA 94612

Re: PFAS Sampling and Analysis Report, Clover Flat Landfill, Calistoga, California

Dear Ms. Karpowicz:

The attached PFAS Sampling and Analysis Report for the Clover Flat Landfill (Landfill), which

was prepared by Golder Associates Inc. for Clover Flat Landfill, Inc., is hereby submitted in

compliance with the Water Code Section 13267 Order, WQ2019-0006-DWQ issued by the State

Water Quality Control Board on March 20, 2019. The report has been prepared to present the

results of the one-time leachate and groundwater sampling for PFAS.

"I, Christy Pestoni, under penalty of perjury, do hereby state that to the best of my knowledge,

the information contained in this report is true, complete, and correct.”

Sincerely,

Christy Pestoni

Chief Operations Officer

Upper Valley Disposal & Recycling

Clover Flat Resource Recovery Park

cc: Mr. Kano Galindo, Clover Flat Landfill, Inc.

Enclosure: PFAS Sampling and Reporting (May 2020).

PER- AND POLYFLUOROALKYL SUBSTANCES

(PFAS) SAMPLING AND ANALYSIS REPORT CLOVER FLAT LANDFILL

Submitted to:

Clover Flat Landfill, Inc. P.O. Box 382

St. Helena, CA 94574

Submitted by:

Golder Associates Inc.

425 Lakeside Drive, Sunnyvale, California, USA 94085

+1 408 220-9223

Project No. 130029701

May 2020

May 2020 Project No. 130029701

i

Distribution List (1) PDF - Christy Pestoni - Clover Flat Landfill, Inc.

(1) PDF - Kano Galindo - Clover Flat Landfill, Inc.

(1) PDF - Alyx Karpowicz - Regional Water Quality Control Board


ii

Table of Contents

1.0 INTRODUCTION ............................................................................................................................................. 1

2.0 PFAS SAMPLE COLLECTION ...................................................................................................................... 1

2.1 Sample Analysis ................................................................................................................................... 1

2.2 Quality Control...................................................................................................................................... 1

2.2.1 Field Quality Control Samples ........................................................................................................ 1

2.2.2 Laboratory Quality Control Procedures .......................................................................................... 2

3.0 ANALYTICAL RESULTS ................................................................................................................................ 2

TABLES

Table 1 PFAS Analytical Results – Clover Flat Landfill

FIGURES

Figure 1 Site Location Map

Figure 2 PFAS Sampling Locations

APPENDICES

APPENDIX A Field Sampling Sheets

APPENDIX B Laboratory Analytical Report

No table of figures entr ies found .

No table of figures entr ies found . No table of figures entr ies found .


1

1.0 INTRODUCTION

On behalf of Clover Flat Landfill, Inc., Golder Associates Inc. has prepared this report to present the results of the

one-time leachate and groundwater sampling of per- and polyfluoroalkyl substances (PFAS) at the Clover Flat

Landfill (Landfill) in Calistoga, California (Figure 1). This report has been prepared to address the March 20, 2019,

Water Code Section 13267 Order WQ 2019-0006-DWQ request from San Francisco Bay Regional Water Quality

Control Board (Water Board). Golder submitted a workplan for the one-time leachate and groundwater sampling

of PFAS at the Landfill to San Francisco Regional Water Quality Control Board on May 17, 2019.1

The site has been identified by the Water Board as a facility that may have accepted, stored, or used materials

that contained PFAS. This report presents the results of the one-time leachate and groundwater sampling of

PFAS at the Landfill.

2.0 PFAS SAMPLE COLLECTION

The PFAS sampling was conducted on March 30, 2020, according to the Standard Operating Procedure included

in the workplan. Groundwater samples were taken from wells B-4, B-5A, and B-5B. In addition, leachate and

composite condensate/leachate samples were also collected.

Prior to sample collection, groundwater wells B-4, B-5A, and B-5B were each purged using an electric

submersible pump. Groundwater samples from wells B-4, B-5A, and B-5B were collected using the same electric

submersible pump that was used to purge each well. The leachate grab sample was collected from the sample

port of Modules 2A and 2B located within Module 1A and the condensate/leachate composite sample was

collected from holding tanks T1 through T5. Sample locations are shown on Figure 2.

Field parameters, including temperature, electrical conductivity, pH, color, turbidity, dissolved oxygen (DO), and

oxidation reduction potential (ORP) were measured during well purging at least once for each casing volume and

again at the time of sample collection. All field measurements were recorded on a Water Sample Field Data

Sheet (Appendix A).

All samples were poured directly into two 250-mL unpreserved, HDPE bottles (supplied by the lab and guaranteed

to be PFAS free) at the wellheads and were placed on ice in a laboratory supplied cooler. The samples were

submitted to BC Laboratories in Bakersfield, California (Calif. ELAP No. 1186). BC Laboratories then shipped the

samples to Eurofins Lancaster Laboratories Environmental (ELLE) located in Lancaster, Pennsylvania under a

chain of custody.

2.1 Sample Analysis

Samples were analyzed by EPA Method 537-Modified (method compliant with DoD Table B-15 of Quality Systems

Manual Version 5.1 [or later]) for the 23 PFAS listed in the approved workplan.

2.2 Quality Control

2.2.1 Field Quality Control Samples

The following field quality control (QC) samples were collected during the sampling event:

One blind field duplicate groundwater sample was collected by field personnel during the sampling event and

was analyzed for PFAS. The field duplicate was collected in the laboratory-supplied sample containers

1 Golder Associates Inc., May 16, 2019, Per- and Polyfluoroalkyl Substances (PFAS) Sampling and Analysis Work Plan.


2

immediately after collection of the primary sample. Duplicate sample DUP-1 was collected from

groundwater well B-5A. As shown on Table 1, the primary and duplicate samples from well B-5A had similar

results for all analytes tested.

One field blank was collected using PFAS-free water provided by the laboratory. Laboratory-supplied HDPE

field-blank sample containers were opened during the collection of a groundwater sample, and the

laboratory-supplied PFAS-free water was poured directly into the field blank sample container and then

resealed. No PFAS were detected in the field blank sample.

One trip blank was submitted during the sampling event. The trip blanks were prepared by the laboratory and

accompanied the bottles throughout the shipment and sampling process. No PFAS were detected in the trip

blank.

2.2.2 Laboratory Quality Control Procedures

Standard laboratory QC procedures were used by the analytical laboratory to document possible biases related to

the analytical process. The laboratory reported concentrations to method detection limits (MDLs) and limits of

quantification (LOCs). Values between the MDL and LOC are reported as trace and are considered estimates of

the actual concentration. Method blanks were analyzed to assess possible effects of the laboratory environment

on samples. Laboratory control samples (LCS) and LCS duplicates were analyzed by the laboratory to provide a

quantitative measure of accuracy and precision exclusive of matrix sample effects.

Laboratory QC data were evaluated to assess the acceptability of the analytical data:

All samples were received at the appropriate temperature and analyzed within hold time.

Reporting limits were raised due to interference from the sample matrix for both the leachate and

leachate/condensate samples.

A few labeled isotope quality control recoveries associated with analytes PFOSA and 4:2 FTS were outside

the method established limits.

All laboratory control spikes, and laboratory control spike duplicates were within method acceptable limits.

The recovery for injection and extraction standards for some samples was outside of acceptance limits as

noted in the laboratory QC Summary.

These qualifications are typical when modifying a drinking water analytical method for analyses of groundwater

and leachate samples. Details on laboratory QC results are included with the analytical reports in Appendix B.

3.0 ANALYTICAL RESULTS

PFAS were detected in all groundwater, leachate, and leachate/condensate samples collected. All PFAS that

were detected in groundwater samples were also detected in the leachate samples. The results of the one-time

leachate and groundwater sampling of PFAS at the Landfill are presented in Table 1. The complete laboratory

analytical report is included as Appendix B.


3

Signature Page

Golder Associates Inc.

Archana Kukreti, PE

Senior Consultant

FB/AK/ks

Golder and the G logo are trademarks of Golder Associates Corporation

\\sunnyvale\data\projects\clover flat\20138546 (groundwater monitoring -2020)\pfas\pfas report\final_pfas monitoring summary report.docx

Table

May 2020 130029701

AbbreviationChemical Abstracts

Service (CAS) No.Units B-4 B-5A

Dup-1

(B-5A)B-5B Leachate

Holding

Tanks*Field Blank Trip Blank

4:2 Fluorotelomer sulfonic acid 4:2 FTS 757124-72-4 ng/L <0.40 <0.41 <0.40 <0.41 <40 <41 <0.40 <0.45

6:2 Fluorotelomer sulfonic acid 6:2 FTS 27619-97-2 ng/L <1.6 <1.6 <1.6 4.6 <160 <160 <1.6 <1.8

8:2 Fluorotelomer sulfonic acid 8:2 FTS 39108-34-4 ng/L <0.80 <0.82 <0.79 <0.81 <80 <81 <0.81 <0.89

NEtFOSAA 2991-50-6 ng/L <0.40 8.7 8.1 <0.41 <40 760 <0.40 <0.45

NMeFOSAA 2355-31-9 ng/L <0.48 <0.49 0.54 J <0.49 <48 65 J <0.48 <0.54

Perfluorobutane sulfonic acid PFBS 375-73-5 ng/L <0.40 7.3 8.1 13 44 J 82 J <0.40 <0.45

Perfluorobutanoic acid PFBA 375-22-4 ng/L 2.8 J 72 69 59 210 J 220 J <1.6 <1.8

Perfluorodecane sulfonic acid PFDS 335-77-3 ng/L <0.40 <0.41 <0.40 <0.41 <40 <41 <0.40 <0.45

Perfluorodecanoic acid PFDA 335-76-2 ng/L <0.40 <0.41 <0.40 <0.41 <40 <41 <0.40 <0.45

Perfluorododecanoic acid PFDoDA 307-55-1 ng/L <0.40 <0.41 <0.40 <0.41 <40 <41 <0.40 <0.45

Perfluoroheptane sulfonic acid PFHpS 375-92-8 ng/L <0.40 0.54 J 0.59 J 0.90 J <40 <41 <0.40 <0.45

Perfluoroheptanoic acid PFHpA 375-85-9 ng/L 0.92 J 12 12 14 330 230 <0.40 <0.45

Perfluorohexane sulfonic acid PFHxS 355-46-4 ng/L <0.40 26 27 15 310 670 <0.40 <0.45

Perfluorohexanoic acid PFHxA 307-24-4 ng/L 3 79 73 27 1400 1500 <0.40 <0.45

Perfluorononanoic acid PFNA 375-95-1 ng/L <0.40 0.72 J 0.62 J <0.41 <40 <41 <0.40 <0.45

Perfluorooctanesulfonamide PFOSAm 754-91-6 ng/L <0.40 1.0 J 0.98 J <0.41 <40 <41 <0.40 <0.45

Perfluorooctane sulfonic acid PFOS 1763-23-1 ng/L <0.40 24 25 11 74 J 140 J <0.40 <0.45

Perfluorooctanoic acid PFOA 335-67-1 ng/L 1.5 J 55 52 63 580 730 <0.40 <0.45

Perfluoropentane sulfonoic acid PFPeS 2706-91-4 ng/L <0.40 4.1 3.5 6.2 <40 <41 <0.40 <0.45

Perfluoropentanoiic acid PFPeA 2706-90-3 ng/L 2.4 25 23 11 500 480 <0.40 <0.45

Perfluorotetradecanoic acid PFTeDA 376-06-7 ng/L <0.40 <0.41 <0.40 <0.41 <40 <41 <0.40 <0.45

Perfluorotridecanoic acid PFTrDA 72629-94-8 ng/L <0.40 <0.41 <0.40 <0.41 <40 <41 <0.40 <0.45

Perfluoroundecanoic acid PFUnDA 2058-94-8 ng/L <0.40 <0.41 <0.40 <0.41 <40 <41 <0.40 <0.45

* Holding tanks containing comingled condensate and leachate.

Only those compounds that were detected in the groundwater and leachate samples are shown.

ng/L nanograms per liter

J Value greater than Method Detection Limit, but below Limit of Quantitation. Value is an estimate.

Notes:

Reporting limits from Eurofins Lancaster Laboratories for non-potable water by EPA 537 modified using the Order-required Liquid Chromatography Tandem Mass Spectrometry (LC/MS/MS) method compliant with DoD Table B-15 of

Quality Systems Manual Version 5.1 (or later).

Table 1. PFAS Analytical Results - Clover Flat Landfill

N-Ethyl perfluorooctane sulfonamidoacetic acid

N-Methyl perfluorooctane sulfonamidoacetic acid

Chemical Name

1

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CLOVER FLAT LANDFILL4380 SILVERADO TRAILCALISTOGA, CALIFORNIA

CLOVER FLAT LANDFILL, INC.CALISTOGA, CALIFORNIA

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DISPOSAL SITE PERMITTED FACILITYBOUNDARY

MODULE LIMITS

NOTES

REFERENCECOORDINATE SYSTEM: NAD 1983 STATEPLANE CALIFORNIA II

FIPS 0402 FEET.

TOPOGRAPHY PREPARED BY TETRA TECH GEOMATIC

TECHNOLOGIES, LAFAYETTE, CALIFORNIA.

DATE OF PHOTOGRAPHY: 7-1-19.

PROJECT

CLOVER FLAT LANDFILL

4380 SILVERADO TRAIL

CALISTOGA, CALIFORNIA

TITLE

PFAS SAMPLING LOCATIONS

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HIGHLIGHTED LOCATIONS SAMPLED FOR PFAS ONMARCH 30, 2020.

APPENDIX A

Field Sampling Sheets

APPENDIX B

Laboratory Analytical Report

Laboratories, Inc.Environmental Testing Laboratory Since 1949

Date of Report: 04/15/2020

Käte Motroni

Golder

425 Lakeside Drive

Sunnyvale, CA 94085

Client Project: 1300297-01

BCL Project:

BCL Work Order:

Enclosed are the results of analyses for samples received by the laboratory on 4/1/2020. If you have

any questions concerning this report, please feel free to contact me.

Invoice ID:

2009617

Clover Flat

B377230

Contact Person: Vanessa Sandoval

Sincerely,

Client Service Rep

Stuart Buttram

Technical Director

Certifications: CA ELAP #1186; NV #CA00014; OR ELAP #4032-001; AK UST101

The results in this report apply to the samples analyzed in accordance with the chain of custody document . This analytical report must be reproduced in its entirety.All results listed in this report are for the exclusive use of the submitting party. BC Laboratories, Inc. assumes no responsibility for report alteration, separation, detachment or third party interpretation.

4100 Atlas Court Bakersfield, CA 93308 (661) 327-4911 FAX (661) 327-1918 www.bclabs.com Page 1 of 32Report ID: 1001018976


Table of Contents

Sample InformationChain of Custody and Cooler Receipt form................................................................................................................................................................ 3

Laboratory / Client Sample Cross Reference................................................................................................................................................................ 5

Subcontract ReportsWO_2009617_SUB_ERLLB.pdf................................................................................................................................................................ 8

NotesNotes and Definitions................................................................................................................................................................ 32




Chain of Custody and Cooler Receipt Form for 2009617 Page 1 of 2




Chain of Custody and Cooler Receipt Form for 2009617 Page 2 of 2




Golder

425 Lakeside Drive

Sunnyvale, CA 94085

Project:

Project Number:

Project Manager:

Clover Flat

1300297-01

Käte Motroni

Reported: 04/15/2020 10:04

Laboratory / Client Sample Cross Reference

Laboratory Client Sample Information

2009617-01

Sampling Point:

Sampling Location:

Project Number:

COC Number: ---

Clover Flat LF

B-4

B-4

Receive Date:

Sampling Date:

Sample Depth:

Lab Matrix:

---

04/01/2020 09:30

03/30/2020 18:14

Water

GAMVSampled By: Sample Type: Water

Delivery Work Order:

Global ID: L10001344067

Location ID (FieldPoint): B-4

Matrix: W

Sample QC Type (SACode): CS

Cooler ID:

2009617-02

Sampling Point:

Sampling Location:

Project Number:

COC Number: ---

Clover Flat LF

M2LS

M2LS

Receive Date:

Sampling Date:

Sample Depth:

Lab Matrix:

---

04/01/2020 09:30

03/30/2020 17:35

Water



Global ID: L10001344067

Location ID (FieldPoint): M2LS

Matrix: W


Cooler ID:

2009617-03

Sampling Point:

Sampling Location:

Project Number:

COC Number: ---

Clover Flat LF

Holding Tanks

Holding Tanks

Receive Date:

Sampling Date:

Sample Depth:

Lab Matrix:

---

04/01/2020 09:30

03/30/2020 17:10

Water



Global ID: L10001344067

Location ID (FieldPoint): Holding Tanks

Matrix: W


Cooler ID:




Golder

425 Lakeside Drive

Sunnyvale, CA 94085

Project:

Project Number:

Project Manager:

Clover Flat

1300297-01

Käte Motroni

Reported: 04/15/2020 10:04



2009617-04

Sampling Point:

Sampling Location:

Project Number:

COC Number: ---

Clover Flat LF

B-5A

B-5A

Receive Date:

Sampling Date:

Sample Depth:

Lab Matrix:

---

04/01/2020 09:30

03/30/2020 15:26

Water



Global ID: L10001344067

Location ID (FieldPoint): B-5A

Matrix: W


Cooler ID:

2009617-05

Sampling Point:

Sampling Location:

Project Number:

COC Number: ---

Clover Flat LF

B-5B

B-5B

Receive Date:

Sampling Date:

Sample Depth:

Lab Matrix:

---

04/01/2020 09:30

03/30/2020 16:00

Water



Global ID: L10001344067

Location ID (FieldPoint): B-5B

Matrix: W


Cooler ID:

2009617-06

Sampling Point:

Sampling Location:

Project Number:

COC Number: ---

Clover Flat LF

Field Blank

Field Blank

Receive Date:

Sampling Date:

Sample Depth:

Lab Matrix:

---

04/01/2020 09:30

03/30/2020 13:02

Water



Global ID: L10001344067

Location ID (FieldPoint): Field Blank

Matrix: W


Cooler ID:




Golder

425 Lakeside Drive

Sunnyvale, CA 94085

Project:

Project Number:

Project Manager:

Clover Flat

1300297-01

Käte Motroni

Reported: 04/15/2020 10:04



2009617-07

Sampling Point:

Sampling Location:

Project Number:

COC Number: ---

Clover Flat LF

DUP-1

DUP-1

Receive Date:

Sampling Date:

Sample Depth:

Lab Matrix:

---

04/01/2020 09:30

03/30/2020 00:00

Water



Global ID: L10001344067

Location ID (FieldPoint): DUP-1

Matrix: W


Cooler ID:

2009617-08

Sampling Point:

Sampling Location:

Project Number:

COC Number: ---

Clover Flat LF

Trip Blank

Trip Blank

Receive Date:

Sampling Date:

Sample Depth:

Lab Matrix:

---

04/01/2020 09:30

03/30/2020 00:00

Water

GAMVSampled By: Sample Type: Trip Blank


Global ID: L10001344067

Location ID (FieldPoint): Trip Blank

Matrix: W


Cooler ID:




Subcontract Report for 2009617 PDF File Name: WO_2009617_SUB_ERLLB.pdf Page 1 of 24
































































































Golder

425 Lakeside Drive

Sunnyvale, CA 94085

Project:

Project Number:

Project Manager:

Clover Flat

1300297-01

Käte Motroni

Reported: 04/15/2020 10:04

Notes And Definitions



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