Attachment_C_-_Airport_Reservoir_Lead_Testing_Results.pdf

Attachment C – Airport Reservoir Preliminary Tank Coating Test Results

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25 March 2026

Beau Kayser

City of Watsonville

Re: Airport Reservoir

Enclosed are the results of analyses for samples received by the laboratory on 03/17/26. If you have any questions concerning this report, please feel free to contact me.

Sincerely, Colby Wakeman

Lab Director

10260 MATERN PLACE

SANTA FE SPRINGS, CA 90670

714-449-9937 PHONE

REPORTS@JONESENV.COM

10260 MATERN PLACE

SANTA FE SPRINGS, CA 90670

714-449-9937 PHONE

REPORTS@JONESENV.COM

Project Manager: Beau Kayser

City of Watsonville

Project Number:

Project: Airport Reservoir

Reported

03/25/26 9:15

ANALYTICAL REPORT FOR SAMPLES

Sample ID Laboratory ID Matrix Date Sampled Date Received

Tank Interior J260880-001 Solid 03/11/2026 08:15 03/17/2026 12:40

Tank Exterior J260880-002 Solid 03/11/2026 08:45 03/17/2026 12:40

DETECTIONS SUMMARY

Sample ID: Laboratory ID:Tank Interior J260880-001

Analyte Result

Reporting

Limit Units Method Notes

Barium, Ba 50.08700 mg/kg EPA 6010

Chromium, Cr 0.51.5 mg/kg EPA 6010

Cobalt, Co 0.54.6 mg/kg EPA 6010

Copper, Cu 0.51.7 mg/kg EPA 6010

Lead, Pb 0.523.7 mg/kg EPA 6010

Nickel, Ni 0.51.8 mg/kg EPA 6010

Vanadium, V 0.52.0 mg/kg EPA 6010

Zinc, Zn 0.518.9 mg/kg EPA 6010

Sample ID: Laboratory ID:Tank Exterior J260880-002

Analyte Result

Reporting

Limit Units Method Notes

Barium, Ba 50.06440 mg/kg EPA 6010

Chromium, Cr 0.53.6 mg/kg EPA 6010

Cobalt, Co 0.53.8 mg/kg EPA 6010

Copper, Cu 0.54.3 mg/kg EPA 6010

Lead, Pb 0.519.4 mg/kg EPA 6010

Nickel, Ni 0.53.6 mg/kg EPA 6010

Vanadium, V 0.54.0 mg/kg EPA 6010

Zinc, Zn 0.5124 mg/kg EPA 6010

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.

Jones Environmental, Inc.

Colby Wakeman

Lab Director

714-449-9937 PHONE

REPORTS@JONESENV.COM

Project Manager: Beau Kayser

City of Watsonville

Project Number:

Project: Airport Reservoir

Reported

03/25/26 9:15

Tank Interior

J260880-001(Solid)

Result Reporting Limit Units Method NotesAnalyte Dilution Batch Analyzed

EPA 6010B Metals by ICP-OES by EPA 6010

Silver, Ag ND 0.5 mg/kg EPA 601003/19/26QC26033631

Arsenic, As ND 5.0 mg/kg """"

Barium, Ba 8700 50.0 mg/kg """100

Beryllium, Be ND 0.5 mg/kg """1

Cadmium, Cd ND 0.5 mg/kg """"

Cobalt, Co 4.6 0.5 mg/kg """"

Chromium, Cr 1.5 0.5 mg/kg """"

Copper, Cu 1.7 0.5 mg/kg """"

Molybdenum, Mo ND 0.5 mg/kg """"

Nickel, Ni 1.8 0.5 mg/kg """"

Lead, Pb 23.7 0.5 mg/kg """"

Antimony, Sb ND 5.0 mg/kg """"

Selenium, Se ND 5.0 mg/kg """"

Thallium, Tl ND 5.0 mg/kg """"

Vanadium, V 2.0 0.5 mg/kg """"

Zinc, Zn 18.9 0.5 mg/kg """"

EPA 7471A Mercury via AA by EPA 7471

Mercury, Hg ND 0.020 mg/kg EPA 747103/18/26QC26033491

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.

Jones Environmental, Inc.

Colby Wakeman

714-449-9937 PHONE

REPORTS@JONESENV.COM

Project Manager: Beau Kayser

City of Watsonville

Project Number:

Project: Airport Reservoir

Reported

03/25/26 9:15

Tank Exterior

J260880-002(Solid)

Result Reporting Limit Units Method NotesAnalyte Dilution Batch Analyzed

EPA 6010B Metals by ICP-OES by EPA 6010

Silver, Ag ND 0.5 mg/kg EPA 601003/19/26QC26033631

Arsenic, As ND 5.0 mg/kg """"

Barium, Ba 6440 50.0 mg/kg """100

Beryllium, Be ND 0.5 mg/kg """1

Cadmium, Cd ND 0.5 mg/kg """"

Cobalt, Co 3.8 0.5 mg/kg """"

Chromium, Cr 3.6 0.5 mg/kg """"

Copper, Cu 4.3 0.5 mg/kg """"

Molybdenum, Mo ND 0.5 mg/kg """"

Nickel, Ni 3.6 0.5 mg/kg """"

Lead, Pb 19.4 0.5 mg/kg """"

Antimony, Sb ND 5.0 mg/kg """"

Selenium, Se ND 5.0 mg/kg """"

Thallium, Tl ND 5.0 mg/kg """"

Vanadium, V 4.0 0.5 mg/kg """"

Zinc, Zn 124 0.5 mg/kg """"

EPA 7471A Mercury via AA by EPA 7471

Mercury, Hg ND 0.020 mg/kg EPA 747103/18/26QC26033491

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.

Jones Environmental, Inc.

Colby Wakeman

714-449-9937 PHONE

REPORTS@JONESENV.COM

Project Manager: Beau Kayser

City of Watsonville

Project Number:

Project: Airport Reservoir

Reported

03/25/26 9:15

EPA 6010B Metals by ICP-OES by EPA 6010 - Quality Control

Result

Reporting

Limit Units RPD NotesAnalyte

Spike

Level

Source

Result %REC

%REC

Limits

%REC

Limits

Batch QC2603363 - EPA 6010

CCV 1

1.0 0.5 %Barium, Ba 1 99 90 - 110 110

1.0 0.5 %Cobalt, Co 1 102 90 - 110 110

1.1 0.5 %Lead, Pb 1 106 90 - 110 110

1.0 5.0 %Selenium, Se 1 103 90 - 110 110

1.0 0.5 %Zinc, Zn 1 104 90 - 110 110

LCS 1

195 0.5 %Barium, Ba 200 98 80 - 120

49.8 0.5 %Cobalt, Co 50 100 80 - 120

50.0 0.5 %Lead, Pb 50 100 80 - 120

182 5.0 %Selenium, Se 200 91 80 - 120

48.4 0.5 %Zinc, Zn 50 97 80 - 120

LCSD 1

192 0.5 %Barium, Ba 200 96 80 - 120 1.83 120

48.9 0.5 %Cobalt, Co 50 98 80 - 120 1.86 120

49.0 0.5 %Lead, Pb 50 98 80 - 120 1.94 120

180 5.0 %Selenium, Se 200 90 80 - 120 1.36 120

47.6 0.5 %Zinc, Zn 50 95 80 - 120 1.69 120

Method Blank 1

ND 0.5 mg/kgSilver, Ag

ND 5.0 mg/kgArsenic, As

ND 0.5 mg/kgBarium, Ba

ND 0.5 mg/kgBeryllium, Be

ND 0.5 mg/kgCadmium, Cd

ND 0.5 mg/kgCobalt, Co

ND 0.5 mg/kgChromium, Cr

ND 0.5 mg/kgCopper, Cu

ND 0.5 mg/kgMolybdenum, Mo

ND 0.5 mg/kgNickel, Ni

ND 0.5 mg/kgLead, Pb

ND 5.0 mg/kgAntimony, Sb

ND 5.0 mg/kgSelenium, Se

ND 5.0 mg/kgThallium, Tl

ND 0.5 mg/kgVanadium, V

ND 0.5 mg/kgZinc, Zn

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.

Jones Environmental, Inc.

Colby Wakeman

714-449-9937 PHONE

REPORTS@JONESENV.COM

Project Manager: Beau Kayser

City of Watsonville

Project Number:

Project: Airport Reservoir

Reported

03/25/26 9:15

EPA 7471A Mercury via AA by EPA 7471 - Quality Control

Result

Reporting

Limit Units RPD NotesAnalyte

Spike

Level

Source

Result %REC

%REC

Limits

%REC

Limits

Batch QC2603349 - EPA 7471

CCV 1

5.091 0.020 %Mercury, Hg 5 102 80 - 120 120

LCS 1

1.05 0.020 %Mercury, Hg 1 105 80 - 120

LCSD 1

1.08 0.020 %Mercury, Hg 1 108 80 - 120 2.34 120

Method Blank 1

ND 0.020 mg/kgMercury, Hg

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.

Jones Environmental, Inc.

Colby Wakeman

714-449-9937 PHONE

REPORTS@JONESENV.COM

Project Manager: Beau Kayser

City of Watsonville

Project Number:

Project: Airport Reservoir

Reported

03/25/26 9:15

Notes and Definitions

ND Analyte NOT DETECTED at the reporting limit or MDL if shown.

RPD Relative Percent Difference

E Estimated Concentration; concentration exceeds calibration range.

LCC Leak Check Compound

MDL Compound Reported to Method Detection Limit

1 Recovery outside of acceptable limits. LCS/LCSD recoveries and %RSD were within QC limits, therefore data was accepted.

SMSR Sample matrix prevented adequate surrogate recovery.

J Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.

HHSR High hydrocarbon concentration in this sample prevented adequate surrogate recovery.

OV Sample was filtered in the lab before extraction.

HHTAR High hydrocarbon concentration prevented in-range recovery of target analytes.

IHRPD Target analyte recoveries were outside of range but accepted due to passing RPDs

AROL Target analyte recovery exceeded recovery range but was accepted due to ND of that analyte in MB and sample(s).

Isomers could not be sufficiently chromatographically resolved according to method requirements due to hydrocarbon interference or other matrix effects. The isomers' reported individual concentrations were each calculated as the average of each of the individual isomers' concentrations.

ISO-H

2 Recovery outside of acceptable limits for either LCS or LCSD. CCV and LCS or LCSD recoveries were within limits; therefore data was accepted.

RPD outside of acceptable limits. Target analyte recoveries were within QC limits; therefore, data was accepted.3

4 LCS and/or LCSD recoveries exceeded acceptability ranges. Target analyte recoveries were accepted due to passing CCV, in-range

LCS/LCSD RPDs, and a clean MB in which all target analytes were < RL.

SMTAR Sample matrix prevented adequate recovery of target analytes.

SMTAR Sample matrix prevented adequate recovery of target analytes.

RV Surrogate recovery outside of control limits due to required dilution.

ASP Hydrocarbons in this sample most closely resemble asphalt.

@ Surrogate is outside acceptable limits. All other QC parameters in control, therefore data was accepted.

S Sample was subjected to elemental sulfur cleanup by EPA 3660B.

TIC Tentatively Identified Compound. Compound is not in the calibration mix and does not have a valid calibration. All reported detections are estimated

5 MS and/or MSD recoveries exceeded acceptability ranges. Target analyte recoveries were accepted due to passing CCV, in-range

LCS/LCSD RPDs, and a clean MB in which all target analytes were < RL.

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.

Jones Environmental, Inc.

Colby Wakeman

714-449-9937 PHONE

REPORTS@JONESENV.COM

Project Manager: Beau Kayser

City of Watsonville

Project Number:

Project: Airport Reservoir

Reported

03/25/26 9:15

TH1 This sample was analyzed outside the recommended EPA holding time.

YP Associated CCV outside of control limits low.

IB CCV recovery above limit; analyte not detected

LO MS and/or MSD result unavailable. Batch accept. based on LCS rec.

YQ Associated CCV outside of control limits high.

GN Surrogate recovery is outside of control limits

LG Surrogate recovery below the acceptance limits.

LH Surrogate recovery above the acceptance limits.

AZ Surr. recovery outside of acceptance limits due to matrix interf.

HN Low concentration matrix spike recovery out of limits

HO High concentration matrix spike recovery out of limits

M A matrix effect is present.

LR LCS recovery below method control limits.

TW LCS recovery exceeds control limit.

I-05 Low internal standard recovery possibly due to matrix interference. The result is suspect

RPD RPD exceeded acceptance criteria; all other QC recoveries were within limits.

OAL RPD outside acceptable limits.

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.

Jones Environmental, Inc.

Colby Wakeman

Login Report

Order ID: J260880Customer Name: City of Watsonville

Purchase Order:

Project ID: Airport Reservoir

Comment:

Order Date: 3/17/2026

Sample #: J260880-001 Site:

Date Collected: 03/11/26

Date Received: 03/17/26

Customer Sample #: Tank Interior

Comment:

Collector:

Matrix: SolidQuantity: 1

Recv'd:

Test Test Group Method Due Date Priority

8:15 AM

12:40 PM

6010 3/25/2026EPA 6010

Mercury, Hg 3/25/2026EPA 7471

Sample #: J260880-002 Site:

Date Collected: 03/11/26

Date Received: 03/17/26

Customer Sample #: Tank Exterior

Comment:

Collector:

Matrix: SolidQuantity: 1

Recv'd:

Test Test Group Method Due Date Priority

8:45 AM

12:40 PM

6010 3/25/2026EPA 6010

Mercury, Hg 3/25/2026EPA 7471

Order ID: J260880Customer Name: City of Watsonville

Purchase Order:

Project ID: Airport Reservoir

Comment:

Order Date: 3/17/2026

SAMPLE CONDITION RECORD

1. Are the samples within correct temperature criteria? (0 - 6°C) No

2. If not within temp. criteria, were samples received on ice? No

3. If not within temp. criteria, were samples received on same day of sampling? No

4. Is the Chain of Custody (COC) received filled out completely? Yes

5. Does the total number of containers received match COC? Yes

6. Are the sample container label(s) consistent with COC? Yes

7. Are the sample container(s) intact and in good condition? Yes

8. Were the proper containers & sufficient volume for analyses requested on COC? Yes

9. Was the proper preservative indicated on COC/container for analyses requested? Yes

10. Are the containers for volatile analysis free of headspace? (EPA 8260 water) N/A

EDF Requested No