Attch 13 SS VA Med 47th Semi-Annual GW Monitor Report.pdf

47th SEMI-ANNUAL EVENT

GROUNDWATER QUALITY REPORT

VETERANS AFFAIRS MEDICAL CENTER

7305 North Military Trail West Palm Beach, Florida 33410 SITE NO.: ERIC_10627; formerly COM_121287

October 9, 2024 AECOM Project No. 60711848

October 9, 2024

Mr. Luis Perez Department of Veterans Affairs Medical Center 7305 North Military Trail West Palm Beach, Florida 33410

Re: 47th SEMI-ANNUAL EVENT

GROUNDWATER QUALITY REPORT

VETERANS AFFAIRS MEDICAL CENTER

7305 North Military Trail West Palm Beach, Florida 33410 Site Number: ERIC_10627; formerly COM_121287 AECOM Project # 60711848

Dear Mr. Perez:

AECOM Technical Services Inc. (AECOM) is pleased to present this 47th Groundwater Quality Report for the VA Medical Center site located at 7305 North Military Trail, West Palm Beach, Florida.

This report summarizes the September 2024 groundwater quality sampling results. The September 2024 data indicates that total arsenic concentrations continue to exceed the site-specific arsenic Groundwater Cleanup Target Level (GCTL) of 0.05 milligrams per liter (mg/L) within core area groundwater monitoring wells located at the Entrance Ramp Area (DMW-15RN and DMW-15DN) and at the Nursing Home Parking Lot Area (DMW-11 and DMW-14).

The current groundwater quality data for the Entrance Ramp Area remains consistent with historical trends, indicating that arsenic-impacted zones are confined to the immediate vicinity of core monitoring wells. However, the arsenic concentrations were observed to increase in the Nursing Home Parking Lot, where two monitoring wells reported an exceedance of the site-specific arsenic GCTL. While DMW-11 has a history of exceeding the arsenic GCTL, arsenic concentration exceeded the GCTL at DMW-14 for the first time in 15 years of monitoring,.

AECOM appreciates the opportunity to provide our services to the Department of Veterans Affairs on this important project. If you have any questions or require further clarification to any of the information provided in this report, please contact us at your convenience. It is AECOM’s understanding that the VA management is currently considering to pursue a request for No Further Action with Conditions for the arsenic impacted areas at the Entrance Ramp and Nursing Home Parking Lot areas using Risk Management Option II criteria per Chapter 62-780 Florida Administrative Code.

Respectfully submitted, AECOM Technical Services Inc.

Babu Madabhushi Project Manager cc: Ms. Norma Blandin, FDEP-Southeast District, West Palm Beach, FL Mr. Jeff Hernbloom, West Palm Beach VA Healthcare System

Forty-Seventh Semi-Annual Event Groundwater Quality Report Department of Veteran Affairs Medical Center

7305 North Military Trail West Palm Beach, Palm Beach County, Florida

ERIC_10627; formerly COM__121287

Statement of Professional Certification

I, Vivek Kamath, P.E. #42618, certify that I currently hold an active license in the State of Florida and am competent through education and experience to provide the engineering service contained in this report. I further certify that this Forty-Seventh Semi-Annual Event Groundwater Quality Report was prepared under my direct supervision.

Vivek Kamath

Project Engineer FL. License # 42618

This item has been digitally signed and sealed by Vivek S. Kamath, P.E., on the date indicated here. Printed copies of this document are not considered signed and sealed and the signature must be verified on any electronic copies.

Kamath, Vik Stamp

TABLE OF CONTENTS

1.0 INTRODUCTION

1.1 OBJECTIVE

2.0 GROUNDWATER QUALITY

2.1 GROUNDWATER SAMPLING

3.0 LABORATORY ANALYTICAL RESULTS

3.1 GROUNDWATER ANALYSES

3.1.1 Entrance Ramp Area

3.1.2 Nursing Home Parking Lot Area

4.0 DIRECTION OF GROUNDWATER FLOW

4.1 POTENTIOMETRIC SURFACE MEASUREMENTS

5.0 ARSENIC AND IRON CONCENTRATION TRENDS

6.0 CONCLUSIONS

7.0 RECOMMENDATIONS

LIST OF FIGURES

Figure 1 VA Medical Center – Site Map Figure 2 Monitor Well Location Map – Entrance Ramp Area Figure 3 Monitor Well Location Map – Nursing Home Parking Lot Figure 4 Arsenic Groundwater Concentration Map, September 10, 2024, Entrance

Ramp Area Figure 5 Iron Groundwater Concentration Map, September 10, 2024, Entrance Ramp

Area Figure 6 Arsenic Groundwater Concentration Map, September 11, 2024, Nursing

Home Parking Lot Figure 7 Iron Groundwater Concentration Map, September 11, 2024, Nursing Home

Parking Lot Figure 8 Manganese Groundwater Concentration Map, September 11, 2024, Nursing

Home Parking Lot Figure 9 Total Dissolved Solids Groundwater Concentration Map, September 11, 2024, Nursing Home Parking Lot Figure 10 Groundwater Elevation Map, September 10, 2024, Entrance Ramp Area Figure 11 Groundwater Elevation Map, September 11, 2024, Nursing Home Parking

Lot Figure 12 Graph of Arsenic Concentrations versus Water Table Elevations, DMW3N, DMW3D, DMW-11 & DMW-12

Figure 13 Graph of Arsenic Concentrations versus Water Table Elevations, DMW-

15RN & DMW-15DN

Figure 14 Graph of Arsenic Concentrations versus Iron Concentrations, Nursing

Home Parking Lot

LIST OF TABLES

Table 1 Summary of Groundwater Field Parameters Table 2 Summary of Arsenic Groundwater Concentrations, Entrance Ramp Area Table 3 Summary of Iron Groundwater Concentrations, Entrance Ramp Area Table 4 Summary of Arsenic Groundwater Concentrations, Nursing Home Parking

Lot Area Table 5 Summary of Iron Groundwater Concentrations, Nursing Home Parking Lot

Area Table 6 Summary of Arsenic Groundwater Concentrations, Perimeter Monitor

Wells Table 7 Summary of Iron Groundwater Concentrations, Perimeter Monitor Wells Table 8A Summary of Additional Parameters Groundwater Concentrations, Entrance

Ramp Monitor Wells Table 8B Summary of Additional Parameters Groundwater Concentrations, Nursing

Home Parking Lot Monitor Wells Table 8C Summary of Additional Parameters Groundwater Concentrations, Perimeter Monitor Wells Table 9A Summary of Groundwater Elevation Data, Entrance Ramp Area Table 9B Summary of Groundwater Elevation Data, Nursing Home Parking Lot

LIST OF APPENDICES

Appendix A FDEP Deliverable Review Letter Appendix B Groundwater Sampling Logs Appendix C Laboratory Analytical Reports and Chain-of-Custody Records

47th Semi-Annual Event-Groundwater Quality Report VA Medical Center

October 8, 2024

1.0 INTRODUCTION

On September 10 and September 11, 2024, AECOM Technical Services (AECOM) completed a semi-annual groundwater quality testing event at the Veterans Affairs (VA) Medical Center (Site NO.: ERIC_10627; formerly COM_121287). A site plan of the VA Medical Center property is shown on Figure 1.

This is the 47th groundwater quality monitoring event. Since 1997, arsenic groundwater concentrations have fluctuated in the two impacted areas: the Entrance Ramp Area (Figure 2) and the Nursing Home Parking Lot Area (Figure 3).

After the 36th Semi-Annual Groundwater Quality event (December 1, 2017) requested the Florida Department of Environmental Protection (FDEP) to discontinue analyzing dissolved arsenic, total iron, dissolved iron, manganese, sulfate, and total dissolved solids (TDS), and not to replace the perimeter groundwater monitor well VA-3. On April 11, 2018, the FDEP issued a letter approving discontinuation of analysis for dissolved arsenic, dissolved iron, and sulfate. The FDEP approved discontinuation of analysis for manganese with the exception of monitoring well DMW-3N, DMW-11, and DMW-12. The FDEP also approved of discontinuation of analysis for TDS with the exception of DMW- 22, DMW-23, and DMW-24. Additionally, the FDEP approved the recommendation to not replace the perimeter groundwater monitoring well VA-3.

During the 46th groundwater quality testing event conducted in March 2024, groundwater concentrations exceeded the site-specific Groundwater Cleanup Target Level (GCTL) of

0.05 milligrams per liter (mg/l) for arsenic in the Entrance Ramp monitor wells DMW-15RN and DMW-15DN. On April 10, 2024, the FDEP issued a deliverable review letter recommending continuing the semi-annual groundwater quality monitoring of the Entrance Ramp and Nursing Home Parking Lot areas for total arsenic and total iron, and further analysis of monitoring wells DMW-3N, DMW-11, and DMW-12 for manganese, and monitoring wells DMW-22, DMW-23, and DMW-24 for TDS. A copy of the April 3, 2024, FDEP deliverable review letter is included in Appendix A.

This report documents the results of the 47th semi-annual groundwater quality sampling event conducted in September 2024.

October 8, 2024

1.1 OBJECTIVE

The long-term objective of the groundwater quality monitoring program at the VA Medical Center has been to develop and define methods for site closure based on the best available alternatives or combination of risk assessment and/or controls to minimize exposures to arsenic contamination. The objective of the groundwater quality monitoring is to collect additional information on residual arsenic and iron impacts in the groundwater at the site for trend analysis.

2.0 GROUNDWATER QUALITY

2.1 GROUNDWATER SAMPLING

On September 10th and 11th, 2024, AECOM collected groundwater samples from monitoring wells DMW-2N, DMW-8R, DMW-9RN, DMW-9DN, DMW-15RN, DMW-15DN, DMW-20, DMW-21, DMW-24, DMW-3N, DMW-3D, DMW-11, DMW-12, DMW-13, DMW-

14, DMW-22, and DMW-23.

Each well was purged using a peristaltic pump until the groundwater appeared clear and free of sediment. AECOM then collected field parameters using a YSI multimeter to record the field parameters, temperature, pH, conductivity, Dissolved Oxygen (DO), and Oxidation Reduction Potential (ORP).

The groundwater samples were placed into laboratory prepared sample containers and then stored in a cooler with ice. Each sample container was labeled with the site and well identification, date, time of collection and the requested analysis. Groundwater samples were submitted under chain-of-custody to Eurofins Test America Laboratories (NELAP #E84282) in Orlando, Florida.

Copies of the groundwater sampling logs are attached in Appendix B. Table 1 provides a summary of the groundwater field parameters. The table below summarizes the monitoring well identification, their respective location, and parameters tested during this sampling event.

October 8, 2024

Sampling Plan

Location/Area Well ID Parameters Figure

Entrance Ramp Area

DMW-2N

Total Arsenic and Iron by EPA Method 6010.

Figure 2

DMW-8R

DMW-9RN

DMW-9DN

DMW-15RN

DMW-15DN

DMW-20

DMW-21

DMW-24

Total Arsenic and Iron by EPA Method 6010

TDS by EPA Method SM 2540.

Nursing Home Parking Lot

Area

DMW-3N Total Arsenic and Iron by EPA Method 6010

Manganese by EPA Method 6061.

Figure 3

DMW-11

DMW-12

DMW-3D

Total Arsenic and Iron by

EPA Method 6010.DMW-13

DMW-14

DMW-22 Total Arsenic and Iron by

EPA Method 6010 TDS by EPA Method SM

2540.DMW-23

October 8, 2024

3.0 LABORATORY ANALYTICAL RESULTS

3.1 GROUNDWATER ANALYSES

3.1.1 Entrance Ramp Area

Laboratory analytical results indicated a slight increase in the total arsenic concentration from the March to September 2024 in the following monitoring wells:

DMW-2N (from 0.0140 mg/L to 0.021 mg/L), DMW-9RN (from 0.016 mg/L to 0.017 mg/L), DMW-9DN (from 0.0073 mg/L to 0.036 mg/L), DMW-15DN (from 0.054 mg/L to 0.061 mg/L), DMW-20 (from 0.0016 mg/L to 0.0019 mg/L), and DMW-24 (from 0.020 mg/L to 0.023 mg/L).

The total arsenic concentrations decreased from March to September 2024 in the following monitoring wells:

DMW-8R (from 0.012 mg/L to below detection limits), DMW-15RN (from 0.290 mg/L to 0.25 mg/L), and DMW-21 (from 0.0025 mg/L to 0.0024 mg/L).

Total arsenic concentrations exceeded the site-specific GCTL of 0.05 mg/L in DMW- 15RN at 0.25 mg/L and DMW-15DN at 0.061 mg/L. The entrance ramp area arsenic -concentration map is provided as Figure 4.

Total iron concentrations within the Entrance Ramp Area monitoring wells ranged from below detection limits in DMW-8R and DMW-20 to 2.1 mg/L in DMW-15DN. Iron concentrations increased from the March 2024 sampling event (from below the Secondary Drinking Water Standard (SDWS) (Standard) of 0.3 mg/L, to exceeding the Standard in monitoring well DMW-9DN (from 0.120 mg/L to 0.51 mg/L).

The iron groundwater concentration exceeded the SDWS in DMW-2N, DMW- 9DN, DMW- 15RN, DMW-15DN, and DMW-24. Figure 5 illustrates the entrance ramp area iron groundwater concentrations for this sampling event.

The TDS concentration in the Entrance Ramp Area (DMW-24) decreased from above the GCTL of 500 mg/L in March 2024 to 450 mg/L during September 2024 sampling event.

October 8, 2024

A summary of the arsenic analytical results is shown in Table 2, and iron analytical results in Table 3. A summary of the TDS results is provided in Table 8A. A copy of the laboratory analytical reports is included in Appendix C.

3.1.2 Nursing Home Parking Lot Area

Laboratory analytical results indicated an increase of the arsenic concentrations compared to the March 2024 sampling event in the following monitoring wells:

DMW-3N (from 0.0046 mg/L to 0.0082 mg/L), DMW-3D (from 0.0220 mg/L to 0.031 mg/L), DMW-11 (from 0.047 mg/L to 0.14 mg/L), DMW-13 (from 0.0046 mg/L to 0.010 mg/L), DMW-14 (from 0.011 mg/L to 0.064 mg/L), and DMW-22 (from 0.0026 mg/L to 0.0029 mg/L)

The total arsenic concentration decreased from the March 2024 sampling event in DMW- 23, from 0.0020 mg/L to 0.00072 mg/L. Arsenic concentrations in DMW-12 remained the same.

Arsenic concentration increased from the March 2024 sampling event (from below the site specific GCTL of 0.05 mg/L to above the GCTL) in DMW-11 (from 0.047 mg/L to 0.14 mg/L) and DMW-14 (from 0.011 mg/L to 0.064 mg/L).

Arsenic concentrations in DMW-11 and DMW-14 were reported above the site-specific GCTL for arsenic of 0.05 mg/L during September 2024 sampling event. Figure 6 presents the arsenic groundwater concentrations for the Nursing Home Parking Lot Area.

Total iron concentrations within the Nursing Home Parking Lot Area monitoring wells ranged from 0.16 mg/L in DMW-22 to 6.0 mg/L in DMW-11. Iron groundwater concentrations increased from the previous March 2024 sampling event (from below the SDWS of 0.3 mg/L, to above the SDWS) in monitoring wells DMW-13 (from 0.150 mg/L to

1.6 mg/L), DMW-14 (from below detection limits to 2.60 mg/L), and DMW-23 (from 0.200 mg/L to 0.60 mg/L).

Iron concentrations were above the Standard of 0.3 mg/L in seven out of the eight sampled monitoring wells located within the Nursing Home Parking Lot area. These include monitoring wells DMW-3N (4.1 mg/L), DMW-3D (3.9 mg/L), DMW-11 (6.0 mg/L), DMW-12 (0.56 mg/L), DMW-13 (1.6 mg/L), DMW-14 (2.6 mg/L), and DMW-23 (0.60 mg/L).

Figure 7 illustrates the total iron concentrations for this sampling event.

October 8, 2024

Total manganese concentrations in the Nursing Home Parking Lot Area ranged from

0.051 mg/L in DMW-3N to 0.10 mg/L in DMW-11. The manganese concentrations were above the GCTL of 0.05 mg/L in DMW-3N (0.051 mg/L), DMW-11 (0.10 mg/L), and DMW- 12 (0.063 mg/L). The total manganese concentrations for the Nursing Home Parking Lot monitoring wells are shown on Figure 8.

The TDS concentration in the Nursing Home Parking Lot Area was 620 mg/L in DMW-22, and 540 mg/L in DMW-23 (above the GCTL of 500 mg/L). The TDS concentrations for the Nursing Home Parking Lot monitoring wells are shown on Figure 9.

A summary of the arsenic laboratory analytical results for the Nursing Home area is presented in Table 4, the laboratory analytical results for iron in Table 5, and additional parameters in Table 8A through 8C. Copies of the laboratory analytical reports are attached in Appendix C.

4.0 DIRECTION OF GROUNDWATER FLOW

4.1 POTENTIOMETRIC SURFACE MEASUREMENTS

AECOM measured the depth to groundwater in each of the monitor wells using the north side of the well casing as the reference point. The groundwater table measurements are summarized in Tables 9A and 9B. The average depth to groundwater has increased compared to the March 2024 measurements by approximately 0.65 feet in the Entrance Ramp Area and 0.34 feet in the Nursing Home Parking Lot Area.

For this sampling event, the groundwater table elevations measured in the Entrance Ramp Area indicated apparent groundwater flow to the northwest/east/southeast (Figure 10). This apparent groundwater flow direction differs from typical groundwater flow direction (southwest). For this sampling event, the groundwater table elevations measured in the Nursing Home Parking Lot Area indicated apparent groundwater flow to the southwest, consistent with historical data (Figure 11).

5.0 ARSENIC AND IRON CONCENTRATION TRENDS

Based on the September 2024 groundwater quality results, arsenic groundwater concentrations showed a general increase in the samples collected from the Entrance Ramp Area and the Nursing Home Parking Lot Area when compared to the March 2024 event, with the exception of DMW-8R, DMW-12, DMW-15RN, DMW-21, and DMW-23.

October 8, 2024

Historical arsenic concentrations have exhibited a general decreasing trendline, as shown on the attached trend charts (Figures 12 and 13).

For this sampling event, the iron concentrations were analyzed to evaluate relationship between iron and arsenic groundwater concentrations. Figure 14 presents a graph of the arsenic/iron concentration data for the core Nursing Home Parking Lot monitoring wells DMW-3N, DMW-3D, DMW-11, and DMW-12. Based upon the current data, the arsenic/iron groundwater concentrations continue to fluctuate without an apparent direct or indirect relationship.

6.0 CONCLUSIONS

The horizontal extent of arsenic groundwater concentrations appears to remain localized on the VA Medical Center property and has not migrated away from the central groundwater monitoring locations both in the Nursing Home Parking Lot Area and the Entrance Ramp Area.

In the Entrance Ramp Area, arsenic concentrations of 0.25 mg/L and 0.061 mg/L were detected in samples from monitoring wells DMW-15RN and DMW-15DN, respectively, both exceeding the site-specific GCTL of 0.05 mg/L. Groundwater flow in this area was observed to move east/southeast.

Arsenic concentrations in the Nursing Home Parking Lot area exhibited in monitor well DMW-11 (0.14 mg/L) and DMW-14 (0.064 mg/L) exceeded the site-specific arsenic cleanup target level of 0.05 mg/L. Monitoring well DMW-14 had an exceedance for the first time since the sampling events started in 2009. Groundwater flow in this area was observed to move towards the southwest.

7.0 RECOMMENDATIONS

AECOM recommends continuation of the semi-annual groundwater quality monitoring program Entrance Ramp and Nursing Home Parking Lot areas. AECOM recommends continued semi-annual groundwater sampling of the Entrance Ramp and Nursing Home Parking Lot monitoring wells for total arsenic and total iron, further analysis of monitor wells DMW-3N, DMW-11, and DMW-12 for manganese, and further analysis of monitoring wells DMW-22, DMW-23, and DMW-24 for TDS. The exceedance of site-specific GCTL for arsenic that was observed in DMW-14 will continue to be monitored during the next monitoring event. In addition, AECOM recommends sampling and analyzing perimeter wells VA-1, VA-2, VA-4 and VA-5 for arsenic and iron in the next semi-annual event.

October 8, 2024

Please note that AECOM and legacy URS Corporation have conducted groundwater monitoring at the VA Medical Center for over 20 years. The arsenic impacted groundwater at the Entrance Ramp and Nursing Home Parking Lot, although fluctuates with the seasons, has shown an overall decrease in arsenic concentrations and has not migrated offsite. It is AECOM’s understanding that the VA management is currently considering pursuing a request for No Further Action with Conditions for the arsenic impacted areas at the Entrance Ramp and Nursing Home Parking Lot areas using Risk Management Option II criteria, per Chapter 62-780 Florida Administrative Code.

FIGURES

DRAWN:

DATE:

FIGURE:

VA MEDICAL CENTER

7305 N. MILITARY TRAIL

WEST PALM BEACH, FL

SITE MAPC.P.

MARCH. 2024

JOB NO: 60711848 DATE: 2024-03-27Z:

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GARAGE

ENTRANCE

GARAGE

ENTRANCE

INDOOR GARAGE PARKING

MONITOR WELL (ABANDONED/DAMAGED)

LEGEND:

DMW-21

DMW-15D

DMW-6

DMW-9D

DMW-2NDMW-20

DMW-9RN

DMW-8R

DMW-15RN

DMW-24

DMW-9R

SHALLOW MONITOR WELL LOCATION

DEEP MONITOR WELL LOCATION

DMW-9DN

DMW-15DN

DMW-2

(INACCESSIBLE)

DRAWN:

DATE:

Z:

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FIGURE:

VA MEDICAL CENTER

7305 N. MILITARY TRAIL

WEST PALM BEACH, FL

MONITOR WELL

LOCATION MAP

ENTRANCE RAMP AREA

JOB NO: 60711848

C.P.

MARCH 2024

DATE: 2024-03-27

RETENTION LAKE SHORELINE

LEGEND:

DMW-22

DMW-23

DMW-12

DMW-3N DMW-11

DMW-13 DMW-14

SHALLOW MONITOR WELL

LOCATION

DEEP MONITOR WELL LOCATION

DMW-3D

DRAWN:

DATE:

FIGURE:

VA MEDICAL CENTER

7305 N. MILITARY TRAIL

WEST PALM BEACH, FL

MONITOR WELL

LOCATIONS

NURSING HOME PARKING LOT

JOB NO: 60711848

C.P.

MARCH 2024

DATE: 2024-03-27

Z:

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GARAGE

ENTRANCE

GARAGE

ENTRANCE

NEW INDOOR

GARAGE PARKING

MONITOR WELL (ABANDONED/DAMAGED)

(0.05) ARSENIC CONCENTRATION

(Milligrams per Liter)

LEGEND:

BOLD EXCEEDS GROUNDWATER

CLEANUP TARGET LEVEL

I - THE REPORTED VALUE IS BETWEEN

THE LABORATORY METHOD DETECTION

LIMITS (MDL) AND THE LABORATORY

PRACTICAL QUANTITATION LIMIT (PQL)

DMW-21

(0.0024 I)

DMW-15D

DMW-6

DMW-9D

DMW-9R

DMW-2N

(0.021)

DMW-20

(0.0019 I)

DMW-9RN

(0.017)

DMW-8R

(0.00039 U)

DMW-15RN

(0.25)

DMW-24

(0.023)SHALLOW MONITOR WELL LOCATION

DEEP MONITOR WELL LOCATION

DMW-9DN

(0.036)

DMW-15DN

(0.061)

DRAWN:

DATE:

FIGURE:

VA MEDICAL CENTER

7305 N. MILITARY TRAIL

WEST PALM BEACH, FL

ARSENIC GROUNDWATER

CONCENTRATION MAP

ENTRANCE RAMP AREA

9/10/2024JOB NO: 60711848 DATE: 2024-09-27

C.P.

MARCH 2024

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DMW-2

(INACCESSIBLE)

GARAGE

ENTRANCE

NEW INDOOR

GARAGE PARKING

MONITOR WELL (ABANDONED/DAMAGED)

(0.3) IRON CONCENTRATION (Milligrams per Liter)

LEGEND:

BOLD EXCEEDS SECONDARY DRINKING

WATER STANDARD

U - INDICATES THAT THE COMPOUND

WAS ANALYZED FOR BUT NOT

DETECTED ABOVE THE LISTED VALUE

I - THE REPORTED VALUE IS BETWEEN

THE LABORATORY METHOD DETECTION

LIMITS (MDL) AND THE LABORATORY

PRACTICAL QUANTITATION LIMIT (PQL)

GARAGE

ENTRANCE

DMW-21

(0.25)

DMW-15D

DMW-6

DMW-9D

DMW-9R

DMW-2N

(0.60)

DMW-20

(0.11 U)

DMW-9RN

(0.12 I)

DMW-8R

(0.11 U)

DMW-15RN

(1.2)

DMW-24

(0.57)SHALLOW MONITOR WELL LOCATION

DEEP MONITOR WELL LOCATION

DMW-9DN

(0.51)

DMW-15DN

(2.1)

DRAWN:

DATE:

FIGURE:

VA MEDICAL CENTER

7305 N. MILITARY TRAIL

WEST PALM BEACH, FL

IRON GROUNDWATER

CONCENTRATION MAP

ENTRANCE RAMP AREA

9/10/2024JOB NO: 60711848 DATE: 2024-09-27

C.P.

MARCH 2024

DMW-2

(INACCESSIBLE)

(0.05) ARSENIC CONCENTRATION

(Milligrams per Liter)

LEGEND:

BOLD EXCEEDS GROUNDWATER

CLEANUP TARGET LEVEL

I - THE REPORTED VALUE IS

BETWEEN THE LABORATORY

METHOD DETECTION LIMITS (MDL)

AND THE LABORATORY PRACTICAL

QUANTITATION LIMIT (PQL)

DMW-22

(0.0029 I)

DMW-23

(0.00072 I)

DMW-12

(0.014)

DMW-3N

(0.0082)

DMW-11

(0.14)

DMW-13

(0.010)

DMW-14

(0.064)

SHALLOW MONITOR WELL LOCATION

DEEP MONITOR WELL LOCATION

DMW-3D

(0.031)

DRAWN:

DATE:

FIGURE:

VA MEDICAL CENTER

7305 N. MILITARY TRAIL

WEST PALM BEACH, FL

ARSENIC

CONCENTRATION MAP

NURSING HOME PARKING LOT

9/11/2024

JOB NO: 60711848 DATE: 2024-09-27

C.P.

SHALLOW MONITOR WELL LOCATION

(0.3) IRON CONCENTRATION

(Milligrams per Liter)

LEGEND:

BOLD EXCEEDS SECONDARY

DRINKING STANDARD

U - INDICATES THAT THE COMPOUND

WAS ANALYZED FOR BUT NOT

DETECTED ABOVE THE LISTED VALUE

I - THE REPORTED VALUE IS BETWEEN

THE LABORATORY METHOD DETECTION

LIMITS (MDL) AND THE LABORATORY

PRACTICAL QUANTITATION LIMIT (PQL)

DMW-22

(0.160 I)

DMW-23

(0.60)

DMW-12

(0.56)

DMW-3N

(4.1)

DMW-11

(6.0)

DMW-13

(1.6) DMW-14

(2.6)

DEEP MONITOR WELL LOCATION

DMW-3D

(3.9)

DRAWN:

DATE:

FIGURE:

VA MEDICAL CENTER

7305 N. MILITARY TRAIL

WEST PALM BEACH, FL

IRON

CONCENTRATION MAP

NURSING HOME PARKING LOT

9/11/2024

JOB NO: 60711848 DATE: 2024-09-27

(0.037) MANGANESE CONCENTRATION

(Milligrams per Liter, mg/l)

LEGEND:

NA NOT ANALYZED, MANGANESE

SAMPLING DISCONTINUED IN 2018

(0.057) BOLD - EXCEEDS SECONDARY

DRINKING WATER STANDARD OF

0.050 mg/l

SHALLOW MONITOR WELL LOCATION

DEEP MONITOR WELL LOCATION

DMW-22

(NA)

DMW-23

(NA)

DMW-12

(0.063)

DMW-3N

(0.051)

DMW-11

(0.10)

DMW-13

(NA)

DMW-14

(NA)

DMW-3D

(NA)

DRAWN:

DATE:

FIGURE:

MANGANESE

CONCENTRATION MAP

NURSING HOME PARKING LOT

9/11/24

VA MEDICAL CENTER

7305 N. MILITARY TRAIL

WEST PALM BEACH, FL

JOB NO: 60711848 DATE: 2024-09-27

(460) TOTAL DISSOLVED SOLIDS

CONCENTRATION (Milligrams per Liter)

NA NOT ANALYZED, MANGANESE

SAMPLING DISCONTINUED

FROM 2018 ONWARD

(1100) BOLD - EXCEEDS SECONDARY DRINKING

WATER STANDARD OF 500 mg/l

LEGEND:

SHALLOW MONITOR WELL LOCATION

DEEP MONITOR WELL LOCATION

DMW-22

(620)

DMW-23

(540)

DMW-12

(NA)

DMW-3N

(NA)

DMW-11

(NA)

DMW-13

(NA)

DMW-14

(NA)

DMW-3D

(NA)

DRAWN:

DATE:

FIGURE:

VA MEDICAL CENTER

7305 N. MILITARY TRAIL

WEST PALM BEACH, FL

TOTAL DISSOLVED SOLIDS

CONCENTRATION MAP

NURSING HOME PARKING LOT

9/11/2024

JOB NO: 60711848 DATE: 2024-09-27

(14.52) GROUNDWATER ELEVATION, FT.

* DEEP MONITOR WELL ELEVATION

NOT USED IN CONTOURING

GROUNDWATER FLOW

DIRECTION

GROUNDWATER CONTOUR - .20 FOOT INTERVAL

SHALLOW MONITOR WELL LOCATION

LEGEND:

DMW-22

(14.72)

DMW-23

(13.75)

DMW-12

(13.43)

DMW-11

(13.77)

DMW-13

(12.96) DMW-14

(13.78)

DEEP MONITOR WELL LOCATION

DMW-3D*

.5

.3

.1

013.9

13.70

13.10

DMW-3N

(13.76)

DRAWN:

DATE:

FIGURE:

VA MEDICAL CENTER

7305 N. MILITARY TRAIL

WEST PALM BEACH, FL

GROUNDWATER

ELEVATION MAP

NURSING HOME PARKING LOT

9-11-2024

C.P.

JOB NO: 60711848 DATE: 2024-09-27

-0.1

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8 Ja

n-

Ju l-0

Ja n-

Ju l-0

Ja n-

Ju l-0

Ja n-

Ju l-0

Ja n-

Ju l-0

Ja n-

Ju l-0

Ja n-

Ju l-0

Ja n-

Ju l-0

Ja n-

Ju l-0

Ja n-

Ju l-0

Ja n-

Ju l-1

Ja n-

Ju l-1

Ja n-

Ju l-1

Ja n-

Ju l-1

Ja n-

Ju l-1

Ja n-

Ju l-1

Ja n-

Ju l-1

Ja n-

Ju l-1

Ja n-

Ju l-1

Ja n-

Ju l-1

Ja n-

Ju l-2

Ja n-

Ju l-2

Ja n-

Ju l-2

Ja n-

Ju l-2

Ja n-

Ju l-2

Ja n-

W at er T ab le

E le va tio n (ft

Ar se ni c

C on ce nt ra tio n (m g/ l)

Figure 12 Trend of Arsenic Groundwater Concentrations - Nursing Home Parking Lot

DMW-3D DMW-11 DMW-12 Water Table Linear (DMW-3D) Linear (DMW-11) Linear (DMW-12)

Trendline-DMW-3D

Trendline DMW-12

Trendline DMW-11

0.00

2.00

4.00

6.00

8.00

10.00

12.00

14.00

16.00

18.00

20.00

0.0

1.0

2.0

3.0

4.0

5.0

6.0

W at er T ab le

E le va tio n (ft

Ar se ni c

C on ce nt ra tio ns (m g/ l)

Figure 13 Arsenic Groundwater Concentrations Compared to Water Table Elevations

DMW-15RN & DMW-15DN

DMW-15RN DMW-15DN DMW-15RN - Water Table DMW-15DN - Water Table Expon. (DMW-15RN) Expon. (DMW-15DN)

Trendline DMW-15RN

Trendline DMW-15DN

0.00

2.00

4.00

6.00

8.00

10.00

12.00

14.00

16.00

18.00

20.00

0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

Iro n

C on ce nt ra tio ns (m g/ l)

Ar se ni c

C on ce nt ra tio ns (m g/ l)

Figure 14 Arsenic Concentrations Compared to Iron Concentrations

Nursing Home Parking Lot Area

DMW-3N/As DMW-3D/As DMW-11/As DMW-12/As DMW-3N/Fe DMW-3D/Fe DMW-11/Fe DMW-12/Fe

TABLES

TABLE 1

SUMMARY OF GROUNDWATER FIELD PARAMETERS

pH, ORP, DO and Conductivity

VA MEDICAL CENTER

DATE MONITOR

WELL ID

pH [standard units]

Oxidation Reduction Potential

[mV]

Dissolved Oxygen [mg/L]

Conductivity [µS/cm]

6/20/2007 6.55 -56.14 3.10 954 7/30/2008 6.71 1420 1.08 756

12/30/2008 6.74 -90 0.10 946 7/22/2009 6.40 -52 0.45 1012 1/13/2010 6.71 -75 0.09 956 7/28/2010 6.81 -90 0.73 1003 1/31/2011 6.90 -91 0.84 907 7/26/2011 6.40 -71 0.68 960 2/16/2012 6.42 -87 0.15 805 8/1/2012 6.99 -30 0.22 789 2/7/2013 6.49 -75 0.03 924

7/25/2013 6.69 -253 0.19 1207 2/19/2014 6.48 -79 0.20 1207 7/31/2014 6.59 -103 0.35 1188 7/15/2015 6.60 -138 0.26 858 1/27/2016 6.65 -74 0.20 874 7/25/2016 6.75 -98 0.05 875 1/23/2017 6.76 -123 0.17 700

10/10/2017 6.71 -79 0.07 657 4/25/2018 6.85 -109 0.41 548 2/11/2019 6.67 -69.7 0.27 736 6/26/2019 7.00 -69.9 0.14 762 9/10/2020 6.44 7 0.16 372 5/25/2021 6.37 -3.20 2.21 862 2/1/2022 6.63 -52.4 0.07 890 8/3/2022 6.67 -35.3 0.87 870

3/16/2023 6.60 -50.3 0.16 933 8/10/2023 6.68 12.7 0.27 959 3/7/2024 6.71 38.6 0.39 909

9/11/2024 6.69 -54.6 0.18 968

6/20/2007 6.66 -36.65 4.20 1122 7/30/2008 6.84 607 0.60 811

12/30/2008 7.11 -58 0.94 1076 7/22/2009 6.41 -47 0.39 1308 1/13/2010 6.69 -49 0.11 1128 7/28/2010 6.79 -71 0.70 1196 1/31/2011 6.71 -136 0.82 1116 7/26/2011 6.30 -67 0.69 1196 2/16/2012 6.75 -90 0.14 1039 8/1/2012 6.94 -93 0.20 973 2/7/2013 6.45 -71 0.06 1019

7/25/2013 6.75 -204 0.20 1197 2/19/2014 6.49 -52 0.31 1169 7/31/2014 6.62 -73 0.71 1164 7/15/2015 6.67 -205 0.50 899 1/27/2016 6.64 -52 0.14 1065 7/25/2016 6.73 -139 0.04 934 1/23/2017 6.65 -167 0.12 1007

10/10/2017 6.61 -77.7 0.10 879 4/25/2018 6.79 -177.7 0.31 642 2/11/2019 6.67 -93.1 0.31 838 6/26/2019 7.00 -69.1 0.14 795 9/10/2020 6.20 -61.0 0.12 871 5/25/2021 6.46 -11.8 1.81 887 2/1/2022 6.85 -57.6 0.15 956 8/3/2022 6.76 -57.6 0.55 941

3/16/2023 6.66 -66.6 0.07 1046 8/10/2023 6.75 -67.4 0.08 972 3/7/2024 6.80 -41.9 0.06 991

9/11/2024 6.80 -63.1 0.92 1044

DMW-3N

DMW-3D

pH, ORP, DO and Conductivity

VA MEDICAL CENTER

DATE MONITOR

WELL ID

pH [standard units]

Oxidation Reduction Potential

[mV]

Dissolved Oxygen [mg/L]

Conductivity [µS/cm]

1/8/2004 6.53 10.25 1.160 863 7/29/2004 6.42 -21.77 0.577 1019 8/18/2005 6.92 14.48 1.47 4820 7/22/2009 6.37 8 0.36 1140 1/13/2010 6.58 -13 0.10 974 7/28/2010 6.62 33 0.18 1013 1/31/2011 6.94 54 0.99 900 7/26/2011 6.36 33 0.53 991 2/16/2012 6.68 5 0.19 780 8/1/2012 6.79 52 0.17 787 2/7/2013 6.37 30 0.05 861

7/25/2013 6.67 -186 0.20 1105 2/19/2014 6.48 28 0.15 871 7/31/2014 6.89 -18 0.37 998 7/15/2015 6.58 -52 0.07 654 1/27/2016 6.77 -61 0.16 760 7/25/2016 6.70 -34 0.10 539 1/23/2017 6.63 -87 0.13 602

10/10/2017 6.72 -78.0 0.16 656 4/25/2018 6.73 -93.5 0.42 502 2/11/2019 6.54 -67.4 0.13 665 6/26/2019 7.03 -90.3 0.12 652 9/9/2020 6.10 -28.0 0.11 675

5/25/2021 6.66 -236.4 0.32 617 2/1/2022 6.37 -35.4 0.11 920 8/3/2022 6.54 -37.7 0.41 954

3/16/2023 6.43 -61.7 0.10 981 8/10/2023 6.53 -48.5 0.08 938 3/7/2024 6.67 46.0 0.30 934

9/11/2024 6.84 -119.6 0.31 921

1/8/2004 6.68 -69.76 0.826 1266 7/29/2004 6.55 -61.04 0.527 1248 8/18/2005 6.87 -18.05 1.61 6167 7/22/2009 6.34 -52 0.43 1150 1/13/2010 6.53 -52 0.10 1026 7/28/2010 6.65 -78 0.19 973 1/31/2011 6.94 -82 0.90 849 7/26/2011 6.39 -79 0.34 1093 2/16/2012 6.70 4 0.17 857 8/1/2012 6.79 -54 0.40 756 2/7/2013 6.30 -51 0.05 1145

7/25/2013 6.58 -106 0.21 1491 2/19/2014 6.39 -35 0.17 1374 7/31/2014 6.81 -51 0.84 1183 7/15/2015 6.42 -72 0.17 1054 1/27/2016 6.50 -26 0.10 1174 7/25/2016 6.36 26 0.08 1022 1/23/2017 6.48 -59 0.15 922

10/10/2017 6.55 -43.4 0.10 748 4/25/2018 6.69 -19.8 0.37 613 2/11/2019 6.46 3.2 0.13 735 6/26/2019 6.92 -8.6 0.28 734 9/9/2020 6.27 14.9 0.17 809

5/25/2021 6.56 -217.0 0.26 715 2/1/2022 6.40 87.8 0.24 753 8/3/2022 6.52 35.8 0.54 733

3/16/2023 6.21 24.5 0.44 639 8/10/2023 6.64 -31.6 0.14 755 3/7/2024 6.55 108.4 0.18 755

9/11/2024 6.53 119.1 0.16 740

DMW-11

DMW-12

pH, ORP, DO and Conductivity

VA MEDICAL CENTER

DATE MONITOR

WELL ID

pH [standard units]

Oxidation Reduction Potential

[mV]

Dissolved Oxygen [mg/L]

Conductivity [µS/cm]

1/8/2004 6.53 -5.69 1.092 1004 7/29/2004 6.44 -25.19 0.301 938 8/18/2005 6.87 21.27 1.78 5677 7/22/2009 6.30 83.23 0.59 958 1/13/2010 6.46 119.90 0.21 859 7/28/2010 7.33 102.40 2.28 100 1/31/2011 7.03 71.50 0.62 827 7/26/2011 6.18 -24.1 0.87 877 2/16/2012 6.60 -44.0 0.22 912 8/1/2012 6.79 -26.8 0.24 942 2/7/2013 6.39 -47.0 0.18 800

7/25/2013 6.55 -101.0 0.24 977 2/19/2014 6.26 74.0 0.49 909 7/31/2014 6.86 8.0 0.47 806 7/15/2015 6.55 26.0 0.09 615 1/27/2016 6.65 -21.0 0.09 676 7/25/2016 6.61 -30.8 0.09 688 1/23/2017 6.58 -62.0 0.20 738

10/10/2017 6.66 -133.9 0.15 781 4/25/2018 6.80 13.2 0.66 607 2/11/2019 6.67 -32.7 0.36 1178 6/26/2019 6.53 -44.5 1.33 957 9/9/2020 6.26 -71.1 0.15 927

5/25/2021 6.50 27.5 0.21 883 2/1/2022 6.60 48.7 0.19 754 8/3/2022 6.68 -15.2 0.92 890

3/16/2023 6.58 -48.7 0.10 794 8/10/2023 6.73 -36.3 0.09 935 3/7/2024 6.95 32.4 0.31 864

9/11/2024 6.72 -40.9 0.15 982

1/8/2004 6.61 63.24 1.634 911

7/29/2004 NS NS NS NS

8/18/2005 6.87 32.56 1.90 4960 7/22/2009 6.27 112.1 2.16 922 1/13/2010 6.44 169.8 0.18 889 7/28/2010 6.63 173.8 1.14 1032 1/31/2011 7.08 112.5 0.81 919 7/26/2011 6.23 79.3 0.82 780 2/16/2012 6.60 7.5 0.31 794 8/1/2012 6.67 -24.5 0.32 779 2/7/2013 6.46 52.0 0.17 939

7/25/2013 6.65 56.7 0.49 1063 2/19/2014 6.42 123.0 1.00 930 7/31/2014 6.73 23.0 0.62 908 7/15/2015 6.65 -72.2 1.14 739 1/27/2016 6.66 58.0 0.22 949 7/25/2016 6.70 -5.4 0.09 615 1/23/2017 6.65 16.7 0.20 701

10/10/2017 6.50 18.5 0.25 686 4/25/2018 6.67 31.1 0.77 649 2/11/2019 6.58 55.1 0.80 966 6/26/2019 6.85 110.3 0.61 863 9/9/2020 6.35 41.8 0.38 931

5/25/2021 6.38 79.2 0.29 1035 2/1/2022 6.63 127.7 0.58 916 8/3/2022 6.62 67.6 0.87 852

3/16/2023 6.52 1.5 0.13 818 8/10/2023 6.60 71.1 0.15 762 3/7/2024 6.75 49.6 0.41 1142

9/11/2024 6.71 -121.7 0.14 947

DMW-14

DMW-13

pH, ORP, DO and Conductivity

VA MEDICAL CENTER

DATE MONITOR

WELL ID

pH [standard units]

Oxidation Reduction Potential

[mV]

Dissolved Oxygen [mg/L]

Conductivity [µS/cm]

1/8/2004 6.71 31.1 0.467 1227 7/29/2004 6.48 -5.18 0.448 1429 8/18/2005 7.03 77.08 1.43 6589 7/22/2009 6.52 -11.7 0.28 1145 1/13/2010 6.62 -27.3 0.09 989 7/28/2010 6.70 -29.5 0.62 1133 1/31/2011 7.06 -27.4 0.93 945 7/26/2011 6.36 -9.1 0.53 1235 2/16/2012 6.68 -15.7 0.16 957 8/1/2012 6.99 -51.1 0.19 1002 2/7/2013 6.44 93.0 0.07 1252

7/25/2013 6.78 -108.0 0.42 1925

2/21/2014 7.06 NA 0.48 1470

7/31/2014 7.09 -14.0 0.30 1570 7/15/2015 6.55 -48.3 0.08 1329 1/27/2016 6.61 -48.0 0.14 1303 7/25/2016 6.74 -61.2 0.09 1389 1/23/2017 6.66 -58.0 0.20 1355

10/10/2017 6.59 -56.8 0.18 1021 4/25/2018 6.77 -7.4 0.36 912 2/11/2019 6.47 -20.9 0.16 986 6/26/2019 6.11 -50.2 1.77 1137 9/9/2020 6.01 68.6 0.24 1575

5/25/2021 6.70 -206.9 1.80 1038 2/1/2022 6.80 19.9 0.33 1193 8/3/2022 6.69 26.9 0.51 972

3/16/2023 6.69 43.4 0.24 1174 8/10/2023 6.28 126.5 0.26 796 3/7/2024 6.84 108.7 0.65 1452

3/13/2024** 6.83 109.7 0.64 1433 9/11/2024 6.87 -175.7 0.28 1173

1/8/2004 6.72 -70.88 0.425 1067 7/29/2004 6.58 -57.07 1.152 1125 8/18/2005 7.12 41.68 1.30 5601 7/22/2009 6.42 -19.66 2.92 930 1/13/2010 6.47 102.70 0.11 1130 7/28/2010 6.70 -58.80 0.57 1008 1/31/2011 6.63 -24.70 0.88 953 7/26/2011 6.25 -77.90 0.51 1237 2/16/2012 6.71 7.90 0.12 762 8/1/2012 6.84 -20.40 0.18 889 2/7/2013 6.50 -106.0 0.03 813

7/25/2013 6.70 -139.0 0.17 838 2/19/2014 6.55 7.0 0.33 862 7/31/2014 7.00 -7.0 0.34 958

7/15/2015 NS NS NS NS

1/27/2016 6.60 8.2 0.08 1021 7/25/2016 6.77 49.0 0.06 757 1/23/2017 6.61 -61.0 0.37 937

10/10/2017 6.50 -80.4 0.09 1049 4/25/2018 6.78 -66.7 1.11 759 2/11/2019 6.52 -3.6 0.23 982 6/26/2019 6.13 14.3 1.78 1010 9/9/2020 6.26 -218.4 0.12 872

5/25/2021 6.73 -239.1 0.31 767 2/1/2022 6.80 -76.2 0.20 838 8/3/2022 6.73 -112.4 0.48 1135

3/16/2023 6.48 -163.6 0.15 929 8/10/2023 6.51 -44.1 0.31 1033 3/7/2024 6.83 -34.8 0.46 793

3/13/2024** 6.82 -143.7 0.13 761 9/11/2024 6.90 -292.4 0.45 1059

DMW-22

DMW-23

pH, ORP, DO and Conductivity

VA MEDICAL CENTER

DATE MONITOR

WELL ID

pH [standard units]

Oxidation Reduction Potential

[mV]

Dissolved Oxygen [mg/L]

Conductivity [µS/cm]

1/9/2004 6.59 -64.17 0.375 2160 7/30/2004 6.44 -5.38 0.539 815 8/19/2005 6.87 22.71 1.160 857 7/22/2009 6.40 -49.01 0.03 793

1/14/2010 6.50 NA 0.45 820

7/28/2010 6.63 -57 0.78 795 1/31/2011 6.32 53.4 0.81 706 7/27/2011 6.27 21.3 0.18 813 2/17/2012 6.62 -124 0.37 765 8/2/2012 6.87 -25.4 0.51 582 2/8/2013 6.47 -61 0.06 610

7/26/2013 6.59 -110 0.18 688

2/21/2014 6.70 NA 0.14 693

8/1/2014 6.10 -74 0.60 809

7/14/2015 6.28 -83 0.25 821 1/26/2016 6.53 -27 0.15 734 7/25/2016 6.62 78.9 0.98 491 1/24/2017 6.67 -82.6 0.20 631

10/11/2017 6.95 -1.5 0.78 481 4/25/2018 6.76 85.3 0.37 400.5 2/12/2019 6.33 -28.4 0.15 677.0 6/25/2019 5.40 -44.9 0.65 682.0 9/9/2020 6.49 216.4 0.16 619.0

5/25/2021 6.70 -225.9 0.24 586.0 2/1/2022 6.62 -97.3 0.06 642 8/4/2022 6.74 -121.8 0.29 689

3/17/2023 7.41 -95.5 0.16 695 8/10/2023 7.05 -73.6 0.62 632 3/6/2024 7.08 -28.3 1.31 611

9/10/2024 6.95 -214.6 0.13 670

1/9/2004 6.39 -187.59 0.347 1720 7/30/2004 5.85 -113.47 0.274 484 8/19/2005 6.74 -139.10 1.20 551 7/22/2009 6.08 -150 0.29 628

1/14/2010 6.08 NA 0.55 670

7/28/2010 6.19 -147 0.39 500 1/31/2011 6.23 -98 0.80 475 7/27/2011 5.89 -148 0.39 801 2/17/2012 6.30 -168 0.22 832 8/2/2012 6.78 -49 0.17 833 2/8/2013 5.96 -138 0.01 490

7/26/2013 6.44 -170 0.10 670

2/21/2014 NA NA NA NA

8/1/2014 6.00 -129 0.32 781

7/14/2015 6.06 -141 0.00 677 1/26/2016 6.33 -102 0.13 644 7/25/2016 6.58 135 0.13 644 1/24/2017 6.62 -41 0.09 708

10/11/2017 6.34 -136.9 0.35 655 4/25/2018 7.76 -60.7 0.12 505.1 2/12/2019 6.22 -59.0 0.14 836 6/25/2019 4.39 -121.3 1.01 505 9/9/2020 6.00 197.8 0.05 445

5/25/2021 5.91 -24.3 2.19 520 2/1/2022 6.06 -37.6 0.19 483 8/4/2022 6.05 -110.6 0.15 450

3/17/2023 5.95 -117.2 0.16 567 8/10/2023 6.01 -60.3 0.05 752 3/6/2024 6.44 -54.7 0.15 651

9/10/2024 6.69 101.4 0.31 80.6

DMW-2N

DMW-8R

pH, ORP, DO and Conductivity

VA MEDICAL CENTER

DATE MONITOR

WELL ID

pH [standard units]

Oxidation Reduction Potential

[mV]

Dissolved Oxygen [mg/L]

Conductivity [µS/cm]

1/9/2004 6.52 -164.85 1.618 1819 7/30/2004 6.79 -96.00 0.318 800 8/19/2005 6.82 -90.31 1.74 752 7/22/2009 6.14 -137.4 0.45 715

1/14/2010 6.12 NA 0.33 625

7/28/2010 6.37 -120.0 0.21 699 1/31/2011 6.43 -85.9 0.85 725 7/27/2011 6.02 -150.9 0.51 772 2/17/2012 6.28 -83.8 0.16 756 8/2/2012 6.43 -60.9 0.14 753 2/8/2013 6.25 0.0 0.01 832

7/26/2013 6.44 -116.0 0.13 731

2/21/2014 6.58 NA 0.25 597

8/1/2014 6.85 -108.0 0.29 619

7/14/2015 6.17 -122.0 0.08 825 1/26/2016 6.31 -121.0 0.10 585 7/25/2016 6.31 -199.4 0.08 734 1/24/2017 6.42 -165.2 0.09 555

10/11/2017 6.54 -157.7 0.25 602 4/25/2018 6.56 -211.9 0.32 476 2/12/2019 6.55 -178.3 0.05 504.0 6/25/2019 6.39 -150.8 0.22 531 9/9/2020 6.24 141.0 0.08 486

5/25/2021 6.44 -235.4 0.61 428 2/1/2022 6.37 -121.6 0.03 570 8/4/2022 6.50 -174.9 0.15 553

3/17/2023 6.43 -176.8 0.15 607 8/11/2023 6.48 -126.1 0.06 715 3/6/2024 6.48 -129.4 0.05 788

9/10/2024 6.67 -289.7 0.11 867

1/9/2004 7.03 -137.91 4.366 1939 7/30/2004 6.79 -96.00 0.318 800 8/19/2005 6.98 -70.44 1.090 748 7/22/2009 6.63 -112.3 0.34 866

1/14/2010 6.70 NA 0.05 854

7/28/2010 6.75 -98.4 0.33 901 1/31/2011 6.33 -52.0 0.65 935 7/27/2011 6.42 -90.9 0.25 950 2/17/2012 6.72 -106.4 0.17 887 8/2/2012 7.00 -71.3 0.26 795 2/8/2013 6.47 -58.0 0.02 998

7/26/2013 6.64 -104.0 0.14 1018

2/21/2014 6.73 NA 0.17 829

8/1/2014 6.92 -94.0 0.37 891

7/14/2015 6.07 -109.0 0.00 693 1/26/2016 6.61 -74.0 0.10 760 7/25/2016 6.59 -167.0 0.08 780 1/24/2017 6.70 -84.7 0.09 722

10/11/2017 6.57 -77.2 0.05 728 4/25/2018 6.74 -198.1 0.33 553 2/12/2019 6.80 -130.5 0.09 617 6/25/2019 6.78 -186.9 0.19 678 9/9/2020 6.71 185.6 0.10 645

5/25/2021 6.94 -225.7 1.13 586 2/1/2022 6.78 -122.9 0.09 704 8/4/2022 6.89 -132.4 0.17 643

3/17/2023 7.60 -193.4 0.48 657 8/11/2023 6.79 -80.1 0.65 668 3/6/2024 6.86 -100.9 0.24 788

9/10/2024 6.90 -34.1 1.15 284.2

DMW-9RN

DMW-9DN

pH, ORP, DO and Conductivity

VA MEDICAL CENTER

DATE MONITOR

WELL ID

pH [standard units]

Oxidation Reduction Potential

[mV]

Dissolved Oxygen [mg/L]

Conductivity [µS/cm]

1/9/2004 6.69 -162.1 0.354 2882 7/30/2004 6.49 -62.2 2.252 1146 8/19/2005 6.88 -111.9 1.80 1163 7/22/2009 6.42 -141.0 0.21 1132

1/14/2010 6.46 NA 0.05 1077

7/28/2010 6.66 -140.6 0.52 1155 1/31/2011 7.03 -123.6 0.09 1142 7/27/2011 6.33 -146.1 0.23 1167 2/17/2012 6.61 -111.8 0.15 1064 8/2/2012 6.82 -149.5 0.16 1003 2/8/2013 6.38 -86.0 0.05 1071

7/26/2013 6.66 -163.0 0.21 1146

2/21/2014 6.67 NA 0.11 1026

8/1/2014 6.07 -114 0.33 1105

7/14/2015 6.12 -128 0.57 871 1/26/2016 6.53 -98 0.12 953 7/25/2016 6.60 -160 0.06 994 1/24/2017 6.63 -114 0.13 983

10/11/2017 6.48 -93.9 0.06 804 4/25/2018 6.63 -155.5 0.40 643 2/12/2019 6.64 -107.7 0.34 755 6/25/2019 6.43 -94.1 0.32 903 9/9/2020 6.47 144.7 0.05 862

5/25/2021 6.14 -19.2 0.22 912 2/1/2022 6.65 -90.4 0.21 965 8/4/2022 6.52 -118.7 0.90 835

3/17/2023 7.22 -167.8 0.12 845 8/11/2023 6.52 -66.4 0.07 804 3/6/2024 6.63 -28.8 0.24 796

9/10/2024 6.58 -125.2 0.11 825

1/9/2004 6.61 -181.59 0.241 2650 7/30/2004 6.48 -82.03 2.546 1071 8/19/2005 6.97 -67.97 0.86 607 7/22/2009 6.42 -61.15 1.82 1065

1/14/2010 6.59 NA 0.32 950

7/28/2010 6.69 -86.40 0.49 1006 1/31/2011 7.37 -70.8 0.75 1008 7/27/2011 6.34 -84.0 0.24 1024 2/17/2012 6.64 -128.0 0.19 989 8/2/2012 6.84 -360.8 0.20 1148 2/8/2013 6.37 -82.0 0.02 1045

7/26/2013 6.65 -166.0 0.41 1126

2/21/2014 6.67 NA 0.13 1059

8/1/2014 6.02 -79.0 0.42 1036

7/14/2015 6.13 -91.0 0.20 878 1/26/2016 6.55 -67.0 0.34 955 7/25/2016 6.66 -113.4 0.04 884 1/24/2017 6.67 -97.4 0.09 873

10/11/2017 6.59 -63.0 0.11 808 4/25/2018 6.75 -126.3 0.34 640 2/12/2019 6.77 -92.4 0.08 639 6/25/2019 6.70 -59.1 0.14 732 9/9/2020 6.71 105.2 0.08 748

5/25/2021 6.57 -25.9 0.22 749 2/1/2022 7.01 -66.8 0.59 682 8/4/2022 6.96 -77.5 0.31 668

3/17/2023 6.72 -102.8 0.12 595 8/11/2023 7.23 -244.1 0.26 663 3/6/2024 6.97 -35.1 0.14 669

9/10/2024 6.97 -95.1 0.72 752

DMW-15RN

DMW-15DN

pH, ORP, DO and Conductivity

VA MEDICAL CENTER

DATE MONITOR

WELL ID

pH [standard units]

Oxidation Reduction Potential

[mV]

Dissolved Oxygen [mg/L]

Conductivity [µS/cm]

1/9/2004 6.06 -166.64 0.500 1125 7/30/2004 5.43 -92.69 0.414 272 8/19/2005 6.77 -120.33 2.28 515 7/22/2009 6.01 -160.64 0.35 524

1/14/2010 6.12 NA 0.18 762

7/28/2010 6.15 -157.9 0.26 480 1/31/2011 6.91 -116 0.08 466 7/27/2011 5.75 -152.3 0.37 419 2/17/2012 6.2 -183.4 0.16 893 8/2/2012 6.61 -93.7 0.20 635 2/8/2013 5.91 -137 0.11 444

7/26/2013 6.7 -161 0.13 688

2/21/2014 6.68 NA 0.14 645

8/1/2014 6.28 -112 0.40 637

7/14/2015 6.39 -121 0.14 406 1/26/2016 6.30 -113 0.10 510 7/25/2016 6.79 136 0.99 623 1/24/2017 6.37 -182.7 0.09 480

10/11/2017 6.90 -29.8 0.46 503 4/25/2018 6.95 60.3 0.13 462.7 2/12/2019 6.70 -57.7 0.11 701.0 6/25/2019 5.31 -81.1 0.89 779.0 9/9/2020 6.81 239.4 0.14 655.0

5/25/2021 6.76 -242.5 1.26 448.0 2/1/2022 6.57 -127.6 0.14 633 8/4/2022 6.57 -199.8 0.14 761

3/17/2023 7.20 -266.3 0.70 790 8/11/2023 6.51 -142.4 0.05 973 3/6/2024 6.60 -129.6 0.12 938

9/10/2024 6.77 -306.9 0.09 978

1/9/2004 6.37 -132.54 0.336 2042 7/30/2004 6.33 -156.40 0.375 924 8/19/2005 6.80 -132.32 1.46 888 7/22/2009 6.31 -134 0.46 862

1/14/2010 6.24 NA 0.43 880

7/28/2010 6.49 -154 0.18 927 1/31/2011 6.65 -101 0.16 931 7/26/2011 6.11 -100 0.31 1023 2/17/2012 6.43 -132 0.17 1023 8/2/2012 6.62 -42 0.32 746 2/8/2013 6.28 -123 0.04 722

7/26/2013 6.62 -160 0.15 836

2/21/2014 6.72 NA 0.33 767

8/1/2014 6.01 -106 0.39 882

7/14/2015 6.20 -116 0.86 926 1/26/2016 6.39 -52 0.10 908 7/25/2016 6.46 -172 0.04 882 1/24/2017 6.49 -106 0.20 879

10/11/2017 6.97 -45.7 0.14 655 4/25/2018 6.56 -146.1 0.42 543 2/12/2019 6.13 -53.7 0.09 745 6/25/2019 6.43 -85.5 0.10 816 9/9/2020 6.38 192.6 0.83 758

5/25/2021 6.52 -220.0 0.23 751 2/1/2022 6.41 -102.1 0.04 924 8/4/2022 6.50 -104.9 0.23 817

3/17/2023 6.41 -148.0 0.10 898 8/10/2023 6.38 -28.4 0.05 927 3/6/2024 6.55 -71.2 0.12 960

9/10/2024 6.70 -266.1 0.08 1098

DMW-20

DMW-21

pH, ORP, DO and Conductivity

VA MEDICAL CENTER

DATE MONITOR

WELL ID

pH [standard units]

Oxidation Reduction Potential

[mV]

Dissolved Oxygen [mg/L]

Conductivity [µS/cm]

1/9/2004 6.61 -108.18 0.274 2170 7/30/2004 6.44 -57.98 3.884 921 8/19/2005 6.93 -29.1 1.22 951

1/14/2010 6.41 NA 0.45 972

7/28/2010 6.58 -125.7 0.28 978 1/31/2011 6.99 -89.6 0.86 964 7/26/2011 6.24 75.1 0.49 1994 8/2/2012 6.82 -55.9 0.30 862 2/8/2013 6.51 -43.0 0.17 814

7/26/2013 6.61 -76.0 0.23 915

2/21/2014 6.64 NA 0.11 884

8/1/2014 6.02 -52.0 0.42 823

7/14/2015 6.09 -73.0 0.14 749 1/26/2016 6.60 -24.0 0.13 860 7/25/2016 6.48 -4.8 0.13 812 1/24/2017 6.63 -38.8 0.19 809

10/11/2017 6.64 -60.2 0.29 1095 4/25/2018 6.69 91.2 0.23 641 2/12/2019 6.67 540.0 0.21 752 6/25/2019 5.92 -63.3 0.14 798 9/9/2020 6.49 157.1 0.06 1039

5/25/2021 6.18 42.8 0.60 776 2/1/2022 6.53 -25.9 0.34 934 8/4/2022 6.56 25.8 0.17 856

3/17/2023 7.15 -17.5 0.56 912 8/11/2023 6.48 20.5 0.47 978 3/6/2024 6.76 19.2 0.27 891

3/13/2024** 6.73 13.3 0.57 833 9/10/2024 6.65 -9.1 0.08 833

1/8/2004 6.62 61.4 0.848 731 7/29/2004 6.49 32.0 0.899 1029 8/18/2005 7.14 -125.1 1.15 4907 7/22/2009 6.53 14.9 0.76 774 1/13/2010 6.58 18.8 0.07 792

7/29/2010 6.43 NA 0.72 785

2/1/2011 6.79 NA 0.49 897

7/27/2011 6.91 NA 0.26 1281

2/16/2012 6.79 -37.8 0.23 1169 8/1/2012 7.1 8.9 0.15 1745 2/8/2013 6.69 -64.0 0.20 816

2/19/2014 6.61 37.0 0.27 1116 7/15/2015 6.55 -10.5 0.43 847 1/27/2016 6.79 -6.9 0.19 1566 1/24/2017 7.77 -9.0 0.37 696 4/26/2018 7.87 65.6 0.63 684 6/26/2019 6.53 26.8 1.98 896 2/1/2022 6.93 -59.80 2.77 902

3/16/2023 6.67 -80.0 0.16 1009 3/6/2024 6.88 -104.2 0.15 609

1/8/2004 6.73 90.19 0.314 498 7/30/2004 6.49 70.24 0.724 335 8/19/2005 6.96 80.2 0.800 796 7/22/2009 6.49 42.2 0.44 492 1/13/2010 6.59 56.6 0.14 298

7/29/2010 6.68 NA 0.44 431

2/1/2011 7.02 NA 0.75 455

7/27/2011 7.01 NA 0.57 260

2/16/2012 6.70 57.7 0.38 586 8/2/2012 6.97 89.2 0.28 512 2/8/2013 6.53 89.0 0.10 492

2/19/2014 6.66 97.0 0.69 468 7/14/2015 6.05 -92.0 0.00 252 1/26/2016 6.74 9.1 0.90 343 1/23/2017 6.28 -14.0 0.31 237 4/26/2018 6.61 118.0 0.98 417.2 6/26/2019 7.01 31.8 0.38 399.0 2/2/2022 6.84 28.2 0.53 464.6

3/17/2023 6.42 -46.5 0.71 366 3/6/2024 6.87 14.1 0.56 445

VA-2

VA-1

DMW-24

pH, ORP, DO and Conductivity

VA MEDICAL CENTER

DATE MONITOR

WELL ID

pH [standard units]

Oxidation Reduction Potential

[mV]

Dissolved Oxygen [mg/L]

Conductivity [µS/cm]

1/9/2004 6.57 11.9 0.427 1080 7/30/2004 6.29 -43.8 0.439 472 8/19/2005 6.93 -78.0 0.710 410

7/29/2010 6.38 NA 0.33 330

2/1/2011 6.64 NA 0.71 322

7/27/2011 7.79 NA 0.69 480

2/16/2012 6.69 48.1 0.38 448 8/2/2012 6.79 102.4 0.39 306

2/19/2014 6.55 115.0 1.10 201 7/14/2015 6.38 -122.0 0.25 253 1/26/2016 6.64 128.0 2.72 248 1/23/2017 6.56 47.3 2.01 215

1/9/2004 6.78 -34.9 0.228 1441 7/30/2004 6.51 -45.9 0.447 559 8/19/2005 6.97 -31.1 0.740 501 1/13/2010 6.63 86.6 0.18 865

7/28/2010 6.69 NA 0.78 570

2/1/2011 6.97 NA 0.56 602

7/27/2011 7.90 NA 0.50 643

2/16/2012 6.82 -13.1 0.39 701 8/2/2012 7.18 -29.5 0.23 677 2/8/2013 6.65 -1.8 0.56 661

2/19/2014 6.58 114.0 0.39 908 7/14/2015 6.26 95.0 0.00 822 1/26/2016 6.77 76.0 0.84 902 1/23/2017 6.72 -4.0 0.41 690 4/26/2018 6.91 -24.1 0.32 604 6/26/2019 7.06 -106.2 0.19 796 2/2/2022 6.90 -48.7 0.54 880

3/17/2023 7.42 -102.0 0.08 695 8/11/2023 6.68 -89.5 0.09 800 3/6/2024 6.87 -19.5 0.22 709

1/8/2004 6.74 64.7 0.447 727 7/29/2004 6.57 83.4 0.487 777 8/18/2005 7.15 82.5 1.07 4212 7/22/2009 6.39 109.8 0.31 588 1/13/2010 6.57 98.0 0.03 563

7/28/2010 6.59 NA 0.61 602

2/1/2011 6.88 NA 0.79 739

7/26/2011 6.95 NA 0.93 593

2/16/2012 6.82 -8.1 0.42 440 8/1/2012 6.98 48.1 0.22 453 2/7/2013 6.65 41.0 0.10 611

2/19/2014 6.61 71.0 0.31 591 7/15/2015 6.82 -81.0 0.33 613 1/26/2016 6.71 -26.0 0.16 523 1/23/2017 6.81 49.0 0.79 734 4/26/2018 6.80 36.8 0.47 646 6/26/2019 6.89 -82.4 0.08 741 2/2/2022 6.98 -62.2 0.10 752

3/16/2023 6.84 -112.0 0.14 712 3/6/2024 6.89 -37.3 0.12 614

Notes:

* - Monitoring well VA-3 was abandoned in 2017

** - Monitoring wells were re-sampled due to laboratory error mV - millivolts mg/L - milligrams per liter µS/cm - micro-Siemens per centimeter

VA-5

VA-3*

VA-4

TABLE 2

SUMMARY OF ARSENIC GROUNDWATER CONCENTRATIONS

ENTRANCE RAMP MONITOR WELLS

VA MEDICAL CENTER

SAMPLE DATE DMW-2N DMW-8R DMW-9RN DMW-9DN DMW-15RN DMW-15DN DMW-20 DMW-21 DMW-24

7/22/2009

TOTAL 0.0087 0.031 0.036 0.026 0.98 0.32 0.002 U 0.0030 0.030

DISSOLVED 0.0073 0.033 0.039 0.028 0.86 0.30 0.002 U 0.0021 0.028

1/14/2010

TOTAL 0.0110 0.029 0.034 0.028 0.99 0.71 0.0032 0.0042 0.019

DISSOLVED 0.0110 0.028 0.032 0.025 0.69 0.39 0.0033 0.0042 0.018

7/28/2010

TOTAL 0.012 0.031 0.031 0.022 0.72 0.32 0.0028 I 0.0022 I 0.021

DISSOLVED 0.012 0.032 0.033 0.021 0.60 0.27 0.0023 I 0.0024 I 0.020

1/312/2011

TOTAL 0.017 0.032 0.026 0.023 0.79 0.39 0.0017 I 0.0025 I 0.016

DISSOLVED 0.018 0.036 0.027 0.021 0.64 0.39 0.002 I 0.0026 I 0.014

7/26-27/2011

TOTAL 0.012 0.078 0.042 0.022 1.10 0.32 0.0014 I 0.0064 I 0.00089

DISSOLVED 0.012 0.086 0.046 0.023 1.10 0.32 0.0016 I 0.0062 I 0.0008 U

2/17/2012

TOTAL 0.014 0.067 0.024 0.022 0.72 0.41 0.0026 I 0.0047 I NS

DISSOLVED 0.012 0.071 0.024 0.0064 I 0.25 0.16 0.0029 I 0.0046 I NS

8/2/2012

TOTAL 0.012 0.016 0.026 0.022 0.44 0.13 0.011 0.0027 I 0.073

DISSOLVED 0.0086 0.0087 0.026 0.019 0.44 0.34 0.011 0.0026 I 0.068

2/8/2013

TOTAL 0.022 0.018 0.018 0.020 0.59 0.46 0.0014 I 0.0022 I 0.018

DISSOLVED 0.021 0.020 0.018 0.019 0.52 0.30 0.0013 I 0.0022 I 0.014

7/26/2013

TOTAL 0.012 0.0094 0.012 0.017 0.49 0.37 0.0048 0.0062 0.039

DISSOLVED 0.012 0.010 0.011 0.016 0.40 0.41 0.0042 0.0059 0.032

2/21/2014

TOTAL 0.026 NS 0.020 0.022 0.43 0.30 0.0024 0.0028 0.062

DISSOLVED 0.024 NS 0.020 0.023 0.34 0.41 0.0017 I 0.0028 0.038

8/1/2014

TOTAL 0.041 0.020 0.025 0.015 0.65 0.28 0.0028 0.0025 0.018

DISSOLVED 0.040 0.018 0.023 0.015 0.61 0.29 0.0028 0.0026 0.018

7/14/2015 TOTAL 0.024 0.0096 0.024 0.015 0.48 0.28 0.0023 0.0014 i 0.0088 DISSOLVED 0.024 0.0097 0.025 0.014 0.46 0.18 0.0020 0.0012 i 0.0083

1/26/2016 TOTAL 0.023 0.0055 0.019 0.010 0.62 0.16 0.0017 i 0.0013 i 0.031 DISSOLVED 0.023 0.0062 0.018 0.010 0.58 0.19 0.0015 i 0.0013 i 0.029

7/25/2016 TOTAL 0.0052 0.0061 0.021 0.013 0.48 0.18 0.0048 0.0015 i 0.012 DISSOLVED 0.0052 0.0064 0.019 0.012 0.40 0.16 0.0048 0.0015 i 0.009

1/24/2017 TOTAL 0.0160 0.080 0.021 0.011 0.52 0.15 0.0045 0.0016 i 0.010 DISSOLVED 0.0220 0.071 0.021 0.012 0.49 0.14 0.0038 0.0015 i 0.010

MONITOR WELL ID

TABLE 2

ENTRANCE RAMP MONITOR WELLS

VA MEDICAL CENTER

SAMPLE DATE DMW-2N DMW-8R DMW-9RN DMW-9DN DMW-15RN DMW-15DN DMW-20 DMW-21 DMW-24

MONITOR WELL ID

10/11/2017

TOTAL 0.015 U 0.016 U 0.031 0.025 0.550 0.160 0.015 U 0.012 J 0.028

DISSOLVED 0.015 U 0.013 J 0.025 0.022 0.260 0.068 0.015 U 0.014 J 0.015 U

4/25/2018

TOTAL 0.0064 J 0.025 0.020 0.0062 U 0.013 J 0.019 J 0.0062 J 0.014 J 0.110

2/12/2019

TOTAL 0.012 J 0.027 0.011 J 0.011 J 0.320 0.120 0.0064 J 0.0062 U 0.031

6/25/2019

TOTAL 0.014 J 0.0065 J 0.0078 J 0.0095 J 0.420 0.120 0.0063 J 0.0062 U 0.22

9/9/2020

TOTAL 0.0140 0.0085 I 0.011 0.0074 I 0.630 0.079 0.0045 I 0.0037 I 0.06

5/25/2021

TOTAL 0.007 I 0.0023 I 0.0083 I 0.0086 I 0.420 0.110 0.0019 U 0.0029 I 0.07

2/1/2022

TOTAL 0.0120 0.0050 I 0.025 0.011 0.560 0.052 0.0019 U 0.0023 I 0.036

8/4/2022

TOTAL 0.017 I 0.0064 U 0.011 I 0.007 I 0.520 0.051 0.0064 U 0.0064 U 0.025

3/17/2023

TOTAL 0.012 0.0032 0.0094 0.0059 0.350 0.039 0.0022 U 0.0022 U 0.018

8/10-11/2023

TOTAL 0.020 0.0059 0.017 0.0056 0.370 0.058 0.0022 U 0.0031 I 0.026

3/6/2024

TOTAL 0.0140 0.012 0.016 0.0073 0.290 0.054 0.0016 I 0.0025 I 0.020 J

9/10/2024

TOTAL 0.021 0.00039 U 0.017 0.036 0.25 0.061 0.0019 I 0.0024 I 0.023

Notes:

Shaded background and bold text indicate values above site specific groundwater cleanup target level of 0.05 mg/L Results reported in milligrams per liter U = Analyte included in the analysis, but not detected I = Reported value is between MDL and PQL J = Result is less than the…