6-GROUNDWATER REPORT - EVENT JANUARY 2025 - NEWTON.pdf

SEMI-ANNUAL GROUNDWATER MONITORING REPORT

EVENT #29 – January 2025 for the

FORMER NEWTON LANDFILL

1750 NW 100TH STREET

OCALA, MARION COUNTY, FLORIDA

WCU SITE ID # ERIC_11054

prepared for the

MARION COUNTY SOLID WASTE DEPARTMENT

5601 S.E. 66TH STREET

OCALA, FLORIDA 34480

prepared by

ANDREYEV ENGINEERING, INC.

4055 ST. JOHN’S PARKWAY

SANFORD, FLORIDA 32771

(407) 330-7763

PROJECT NO. GPEN-20-014

March 24, 2025

March 24, 2025 Project No. GPEN-20-014

TO: Florida Department of Environmental Protection

3319 Maguire Boulevard, Suite 232 Orlando, Florida 32803

ATTENTION: Ms. Maria Labrador, Engineering Specialist

SUBJECT: Semi-Annual Groundwater Monitoring Report - Event #29

Former Newton Landfill, WCU Site ID: ERIC_11054 1750 NW 100th Street Ocala, Marion County, Florida

Ms. Labrador:

On behalf of the Marion County Solid Waste Department, Andreyev Engineering, Inc. (AEI) has completed the twenty-ninth semi-annual monitoring report for the subject site. The ADaPT files are attached to the email containing the PDF file for this report.

The former Newton Landfill, regulated under the Amended Consent Order (June 17, 1991), is a closed landfill which received solid waste between 1969 and 1979. Semi-annual groundwater monitoring began in January 2011, per the Consent Order and FDEP letter dated October 19, 2010. This report addresses updated monitoring plan requirements, approved September 4, 2018.

Should you have any questions concerning the contents of this report, please do not hesitate to contact the undersigned at (407) 330-7763.

Sincerely, ANDREYEV ENGINEERING, INC.

Raymond W. Jones, P.E. John C. Houck Vice President Senior Project Geologist ec: Mr. Mark Johnson, Director, Marion County Solid Waste Department

Mr. Jamie Davis, Marion County, Dr. Shakat Ali, P.E., Andreyev Engineering, Inc.

Mr. Omar Smith, P.E., S2Li

TABLE OF CONTENTS

PAGE

Statement of Professional Review……………………………………………………………………...1

1.0 PURPOSE AND SITE INFORMATION

1.1 Purpose

1.2 Site Information

1.3 Overview of Semi-Annual Groundwater Monitoring Activities

2.0 SEMI-ANNUAL MONITORING ACTIVITIES, January 2025

2.1 Groundwater Elevation Measurements and Contour Maps

2.2 Groundwater Sampling Activities, January 2025

2.3 Laboratory Analytical Results, January 2025

3.0 SUMMARY AND RECOMMENDATIONS

3.1 Summary of January 2025 Natural Attenuation Monitoring Activities

3.2 Recommendations

TABLES

Table 1 Monitoring Well Construction Detail Summary Table 2 Groundwater Elevation Summary Table 3 Summary of Groundwater Arsenic, Iron, Manganese, and Field

Parameters Table 4 Summary of Groundwater VOCs 2011-2018

FIGURES

Figure 1 USGS Topographic Map Figure 2 Monitoring Well Locations Figure 3 Groundwater Contour Map, Upper Zone, January 2025 Figure 4 Groundwater Contour Map, Lower Zone, January 2025 Figure 5A Historic Arsenic and Manganese Concentrations Figure 5B 2021-2025 Arsenic and Manganese Concentrations Figure 6 Upper Zone Arsenic Concentration Contour Map, January 2025 Figure 7 Lower Zone Arsenic Concentration Contour Map, January 2025 Figure 8 Upper Zone MNA Concentrations in Groundwater, January 2025 Figure 9 Lower Zone MNA Concentrations in Groundwater, January 2025

APPENDICES

Appendix A FDEP letter and email issued November 15, 2024, regarding previous groundwater monitoring event #28. September 4, 2018, email from FDEP approving Table 1 summarizing current & future groundwater sampling program. Background FDEP letters from October 19, 2010, June 28, 2013, and December 21, 2017.

Appendix B Instrument Calibration Sheet and Groundwater Sampling Logs, January 28 and 29, 2025.

Appendix C Laboratory Analytical Results

This item has been digitally signed and sealed by Ray Jones, P.E. on 3/24/25 Printed copies of this document are not considered signed and sealed and the signature must be verified on any electronic copies

STATEMENT OF PROFESSIONAL REVIEW

The Semi-Annual Groundwater Monitoring Report, Event #29 – January 2025, for the former Newton Landfill located at 1750 NW 100th Street, Ocala, Marion County, Florida has been prepared under the supervision of a Professional Engineer licensed in the State of Florida, in accordance with professional practices pursuant to Chapter 471 of the Florida Statutes.

Raymond W. Jones Vice President

Florida License No. 58079

1.0 PURPOSE AND SITE INFORMATION

1.1 Purpose

The report summarizes the results of the most recent semi-annual groundwater sampling event at the Former Newton Landfill in Marion County. The subject landfill site consists of 42 acres which is located immediately west of U.S. Highway 441 and south of NW 100th Street, at 1750 NW 100th Street, Ocala, Marion County, Florida. Site assessment and groundwater monitoring activities have been conducted for the former Newton Landfill beginning in the early 1990s under a Consent Order1. On October 19, 2010, the Florida Department of Environmental Protection (FDEP) Central District Waste Cleanup Section approved the Supplemental Site Assessment Report dated June 29, 2010, and determined that the site assessment was complete. A copy of the FDEP October 19, 2010, letter is included in Appendix A. The same FDEP letter also approved semi-annual groundwater monitoring in accordance with the existing Consent Order, which required the completion of semi-annual monitoring events in January and July of each year.

Semi-annual monitoring events have been conducted since January 2011, and this report documents the twenty-ninth (29th) semi-annual monitoring event.

Marion County is performing Monitored Natural Attenuation (MNA) at the Newton Landfill. The primary constituent which has been detected at concentrations above the applicable groundwater cleanup target level (GCTL) in groundwater is arsenic. All groundwater samples are analyzed in the laboratory for arsenic, iron and manganese. FDEP issued a review letter for semi-annual groundwater monitoring report #28 on November 15, 2024, and found the semi-annual monitoring report to be acceptable. Copy of the FDEP review letter is included in Appendix A.

At the request of Marion County, AEI reviewed the previous ten years of groundwater data and issued on April 10, 2018, a report titled Newton Landfill Water Quality Trend Analysis Report 2007-2017. This was followed by a meeting held between Marion County and FDEP on July 12, 2018. Some temporary and some permanent changes to the Newton Landfill groundwater sampling program were proposed by AEI and were approved. A copy of this email communication and FDEP’s concurrence on September 4, 2018, is included in Appendix A. Those changes to the groundwater sampling program were followed in the January 2025 groundwater monitoring event.

In December 2024 FDEP requested Marion County more precisely contour concentrations of arsenic, iron and manganese in groundwater (see 2024-2025 correspondence in Appendix A).

To do this FDEP suggested that Marion County obtain groundwater quality data from some 8 existing monitoring wells which are not routinely sampled as part of the Newton Landfill groundwater monitoring program. Plans were made by AEI with FDEP and Marion County input, to sample a total of eight additional monitoring wells on a one-time basis, as well as redevelop 6 of these 8 wells prior to sampling. The eight wells include NMW-17, NMW-21, NMW-22, NMW- 26D, NMW-27, NMW-29, NMW-35 and NMW-36D. This work was approved by Marion County in January 2025. AEI is planning to conduct well redevelopment at 6 wells during Spring 2025.

Then during groundwater sampling Event #30 a total of 18 monitoring wells will be sampled, 8 more than the 10 wells routinely sampled.

1.2 Site Information

The subject site consists of approximately 42 acres at 1750 NW 100th Street and is located southwest of the intersection of U.S. Highway 441 and NW 100th Street. The subject site is located

1 The original Consent Order by the Florida Department of Environmental Regulation was dated February 8, 1988.

An Amended Consent Order was issued June 17, 1991.

approximately five miles north of the City of Ocala, in Section 12, Township 14 South, Range 21 East, as shown on the U.S. Geological Survey (USGS) “Reddick”, Florida Quadrangle Map (1968), included as Figure 1. The landfill site occupies an abandoned limestone quarry. The Newton Landfill originated in 1969 and was operational until 19792. Figure 2 illustrates different site features on a 2016 aerial photograph. The northern portion of the subject site contains the Newton Citizen’s Convenience Center, and the western portion of the subject site contains a paved road which allows access to four buildings utilized by the Marion County Transportation/Road Division. Three stormwater retention areas (ponds) are shown in the northwestern part of the site. Table 1 lists the well screened interval elevations and Monitoring Plan Implemental Schedule (MPIS) designation for each Newton Landfill monitoring well.

Activities for site improvement including stormwater improvements began January 2014 and were completed in November 2014 and were described in AEI’s January 2015 semi-annual groundwater monitoring event #9 report. Improvements included relocation of the Newton Citizen’s Convenience Center to its present location and re-grading of the surface of the property to improve surface water drainage and grounds maintenance.

The Trend Analysis report (2007-2017) issued by AEI in 2018 concluded that during that time period analyzed, arsenic concentrations increased significantly at four monitoring wells south and east of the landfill, including NMW-3R, NMW-16, NMW-23, and NMW-32D. The report updated the hydrogeologic conceptual site model and data gaps were identified. Recommendations in the report included drilling two additional monitoring wells, conducting a sampling event to include the redevelopment and sampling of six existing wells which are not part of the current monitoring network. The report also recommended sampling additional monitored natural attenuation (MNA) constituents on a one-time basis for improved understanding of arsenic mobility and sequestration. In that report those six wells are called “auxiliary wells”. After review of the results of the “auxiliary wells”, a revised monitoring program was prepared and was approved by FDEP.

During a July 12, 2018, meeting among FDEP, Marion County and consultants S2Li and AEI, FDEP requested that private water well sampling results be provided in the future. Marion County Solid Waste personnel typically send out fliers with permission slips to private well owners in the vicinity of the Newton Landfill stating that the County is willing to sample private wells, at no charge, and provide individual homeowners with the results. Typically, several private well owners fill out permission slips for private well sampling and return these to the County before the semi-annual sampling event. Then usually on the last day of sampling or a day after the landfill monitoring wells are sampled, off-site private wells are sampled. No permission slips were received by the County before the January 28-29, 2025 groundwater sampling event. Thus, no private wells were sampled during the January 2025 sampling event.

1.3 Overview of Semi-Annual Groundwater Monitoring Activities

Groundwater sampling according to August 8, 2018, email and attached Table 1 - Summary of Current and Future Ground Water Monitoring Program for Newton Landfill (see Appendix A) was implemented during the groundwater sampling event #29 (January 2025). The sixteen (16) monitoring wells designated for sampling during the January semi-annual groundwater monitoring event are: NMW-2R, NMW-3R, NMW-4, NMW-8, NMW-10, NMW-11, NMW-12, NMW-13R, NMW-16, NMW-23, NMW-24, NMW-31, NMW-32D, NMW-33, NMW-34D and NMW-38D. The locations of all on-site and off-site Newton Landfill monitoring wells are illustrated in Figure 2, which also indicates which monitoring wells are designated for semi-annual versus annual monitoring.

2 Newton Landfill Contamination Assessment Report, by Jones, Edmonds and Associates, May 1994.

Per the agreed plan, the groundwater from NMW-13R is no longer analyzed semi-annually for VOCs. As before, water levels were measured and recorded at all existing monitoring wells prior to sampling, and groundwater contour maps for the upper and lower groundwater zones are prepared for each semi-annual monitoring event. Water levels at two (2) monitoring wells (NMW- 35 and NMW-36D) could not be measured during three sampling events (January 28, 2023, July 18, 2023, and January 23, 2024) as the flush-mounted well heads were covered under a roadway ramp constructed by an electrical utility contractor. Marion County located and uncovered these two (2) mentoring wells, and determined the wells were not damaged. Water levels at monitoring wells NMW-35 and NMW-36D were measured during the July 2024 and January 2025 sampling events according to the groundwater monitoring plan.

2.0 SEMI-ANNUAL MONITORING ACTIVITIES, JANUARY 2025

2.1 Groundwater Elevation Measurements and Contour Maps

Groundwater levels were measured at all on-site and nearby off-site monitoring wells, by Marion County personnel on January 28, 2025. Groundwater levels were measured from the top-of-casing to the nearest hundredths of a foot with an electronic water level indicator. The calculated groundwater elevation data is summarized in Table 2. Comparison with the water levels measured in July 2024 indicates that at most of the wells water level elevations were approximately 1.90 feet higher in January 2025 than in July 2024. The higher water level elevations are probably related to above average seasonal rainfall. The following information is provided for the upper and lower groundwater zones:

Upper Zone: Figure 3 presents the groundwater elevations and a contour map for the

Upper groundwater zone. The general direction of groundwater flow in this zone is to the south and southeast with localized variations in the eastern and western portion of the monitoring area. A slight groundwater mound, possibly related to infiltration at the stormwater ponds at the north end of the site, is not apparent during this event. A significant groundwater mound occurs east of the site, near monitoring well NMW-33. The monitoring wells which are screened in the Upper Zone include: NMW-2R, NMW-3R, NMW-

4, NMW-5, NMW-6, NMW-8, NMW-10, NMW-17, NMW-21, NMW-24,

NMW-27, NMW-29, NMW-31, NMW-33 and NMW-35.

Lower Zone: Figure 4 presents the groundwater elevations and contour map for the lower groundwater zone. The general direction of groundwater flow in this zone is to the south with local variations at the western part of the site. The monitoring wells which are screened in the Lower Zone include: NMW-11, NMW-12, NMW-13R, NMW-16, NMW-18, NMW-22, NMW-23, NNW-25D, NMW-26D, NMW-28D, NMW-30D, NMW-32D, NMW-34D, NMW-36D, NMW-37D, and NMW-38D.

2.2 Groundwater Sampling Activities, January 2025

Groundwater samples were collected from 16 monitoring wells. The set of 16 monitoring wells included: NMW-2R, NMW-3R, NMW-4, NMW-8, NMW-10, NMW-11, NMW-12, NMW-13R, NMW- 16, NMW-23, NMW-24, NMW-31, NMW-32D, NMW-33, NMW-34D and NMW-38D. Groundwater sampling was performed by Ideal Tech Services, Inc., under a contract with Aqua Pure Water & Sewage Service, LLC, on January 28 and 29, 2025. Groundwater samples were collected from each monitoring well in accordance with FDEP SOP #FS 2212. Copies of the groundwater sampling field logs and instrument calibration forms for the January 2025 sampling event are included in Appendix B.

FDEP SOP #FS 2212 requires that at least one well volume of water be purged from each well prior to collection of field parameters. Field parameter measurements were made two to three minutes apart, and groundwater purging was complete when three consecutive measurements were within applicable limits. Groundwater was pumped using either a dedicated bladder pump system in the well or a variable-speed electric submersible sampling pump, capable of low-flow sampling. Each well was purged for approximately 10 to 15 minutes, and readings for temperature, pH, specific conductance, dissolved oxygen and turbidity were measured until these parameters had stabilized. Table 3 contains a summary of the field parameters measured during the January 28 and 29, 2025 sampling event, as well as historical groundwater data. Table 3 highlights exceedances of Chapter 62-777 F.A.C. Groundwater Cleanup Target Levels (GCTLs) as well as exceedances of Natural Attenuation Default Concentrations (NADC). Two duplicate groundwater samples “NMW-12 Dup” and “NMW-13R Dup” were collected on the second day of sampling (1/29/2025). Equipment blank sample labeled “EQ-Blank 1” was collected on the first day of sampling (1/28/2025) and “Equipment Blank 2” was collected on the second day of sampling (1/29/2025). Since January 2019 lower detection and reporting limits were achieved at the laboratory by analyzing arsenic using EPA Method 6020. Lower detection and reporting limits were also achieved for iron and manganese, analyzed by EPA Method 6010.

Measurement of Oxidation-Reduction Potential: In order to further evaluate background groundwater quality conditions, the oxidation-reduction potential (ORP) was measured in the field during well purging and sampling. The ORP values (reported in milli-volts) can be either positive or negative. A negative value is generally indicative of reducing (anoxic) conditions in the aquifer, and a positive value is indicative of an aquifer where oxidizing conditions prevail. An ORP value close to zero indicates that there is a balance of electrons and protons, and there is no tendency to either lose or gain electrons. ORP values measured during sampling are included in Table 3.

2.3 Laboratory Analytical Results, January 2025

The groundwater laboratory analyses for samples collected on January 28 and 29, 2025, were performed by Pace Analytical Services (PAS), located in Ormond Beach, Florida, which is NELAP certified according to Florida Department of Health (Lab #E83079), and operates under a NELAP approved Quality Assurance Plan. The laboratory analytical report is included in Appendix C, and the results are summarized in Table 3. The laboratory reports indicate the samples were placed on ice in a cooler, shipped by courier and received by Pace Laboratory in adequate condition. The following summary information is provided, including a comparison with previous laboratory results and selected field parameters:

Laboratory Analytical Results

Arsenic

Arsenic concentrations in groundwater are summarized in Table 3. The values are plotted with manganese values in Figure 5A (2007-2020) and Figure 5B (2021-2025). Plume maps show arsenic concentrations in Upper Zone groundwater (Figure 6) and Lower Zone groundwater (Figure 7). Decreases and increases in arsenic concentration from July 2024 to January 2025 are as follows:

Decreases: Decreases in arsenic groundwater concentration during January 2025 sampling event were observed at 10 of the 16 monitoring wells sampled (NMW-2R, NMW- 3R, NMW-4, NMW-8, NMW-10, NMW-11, NMW-13R, NMW-24, NMW-31 and NMW-34D). Between July 2024 and January 2025, arsenic concentration in semi-annually sampled monitoring wells decreased from 9.9 to 9.7 ug/L at NMW-2R, from 341 to 291 ug/L at NMW-3R, from 93.3 to 71.8 ug/L at NMW-4; from 5.9 to

3.5 ug/L at NMW-8; from 150 to 112 ug/L at NMW-31 and from 50.2 to 33.5 ug/L at NMW-34D. Between January 2024 and January 2025, arsenic concentration in annually sampled monitoring wells declined from 0.77 to 0.68 ug/L at NMW-10;

from 0.94 to 0.77 ug/L at NMW-11; from 1.2 to 1.1 ug/L at NMW-13R and from 1.3 to 1.2 ug/L at NMW-24. Seven of the 10 wells showing recent decreases (NMW- 2R, NMW-3R, NMW-4 and NMW-8, NMW-10, NMW-24 and NMW-31) have well screens in the Upper groundwater Zone and three wells (NMW-11, NMW-13R and NMW-34D) are screened in the Lower Groundwater Zone.

Increases: Increases in arsenic groundwater concentrations during the January 2025 sampling event were observed at 4 monitoring wells: (NMW-12, NMW-16, NMW- 23 and NMW-32D). Between July 2024 and January 2025, arsenic concentration in semi-annually monitored wells increased from 64.5 to 181 ug/L at NMW-16; from

2.6 to 2.7 ug/L at NMW-23 and from 144 to 147 ug/L at NMW-32D. Increase in arsenic groundwater concentration was observed at annually monitored well NMW-12 sampled during January 2024 and January 2025, from 134 to 157 ug/L.

All the four monitoring wells showing a recent increase (NMW-12, NMW-16, NMW- 23 and NMW-32D) have well screens in the Lower Groundwater Zone.

No change: No definitive change in arsenic concentration was found at two monitoring wells

(NMW-33 and NMW-38D). Arsenic results indicated no change from July 2024 and January 2025 and remained less than the detection limit (0.5 ug/L) at monitoring well NMW-33. Arsenic concentration remained unchanged at 1.7 ug/L between January 2024 and January 2025 at monitoring well NMW-38D.

The average percentage change in arsenic concentration (as a percentage change from the July 2024 arsenic concentrations for semi-annual wells and from January 2024 arsenic concentrations for annual wells) was an increase of 1.18% for all 16 monitoring wells sampled during January 2025 sampling event. Noteworthy percentage decreases in arsenic concentration were at NMW- 8 (down 40.7%) and NMW-34D (down 33.3%). Noteworthy percentage increases in arsenic concentration were at NMW-16 (up 180.6%) and NMW-12 (up 17.2%).

January 2025 arsenic groundwater concentrations which exceeded the Florida Groundwater Cleanup Target Level (GCTL) of 10 ug/L were Upper Zone monitoring wells NMW-3R, NMW-4 and NMW-31, and Lower Zone monitoring wells NMW-12, NMW-16, NMW-32D and NMW-34D.

Maps showing 10 and 100 ug/L January 2025 arsenic concentration contours for the Upper and Lower groundwater zones are presented in Figures 6 and Figure 7, respectively.

Starting with the January 2019 sampling event, EPA method 6020 is being used to determine arsenic concentration with the MDL at 0.50 ug/L and the PQL at 1.0 ug/L. It is noteworthy that arsenic concentration trends have been downward at certain key wells, including Upper Zone NMW-8 (considered the off-site background well and located on the north side of the landfill).

Arsenic concentrations declined below the GCTL of 10 ug/L at NMW-8 in January 2020 and have remained below the GCTL for eleven consecutive monitoring events starting January 2020. The apparent decline in arsenic concentration began at NMW-8 starting with the January 2018 sampling event. Also, arsenic concentrations at NMW-2R have been below the GCTL of 10 ug/L for three sampling events between January 2022 and January 2023 and were below the GCTL during January 2024 through January 2025 sampling events. NMW-2R is an Upper Zone monitoring well located at the north end of the landfill.

Lower Zone NMW-16 (located off-site on the south side of the landfill) has shown a significant increase in arsenic concentration during the January 2025 sampling event, from 64.5 ug/L in July 2024 to 181 ug/L in January 2025. Arsenic concentration in monitoring well NMW-16 had previously shown a continued decline from January 2020 to January 2023 and during January 2024 and July 2024 sampling events.

Iron

Total iron concentrations in groundwater are summarized in Table 3. Plume maps were prepared which show the horizontal extent of total iron in Upper Zone groundwater (Figure 8) and Lower Zone groundwater (Figure 9). Between January 2024 and January 2025, decreases in total iron concentrations in groundwater were observed at 2 annually monitored wells (NMW-11 and NMW- 24). Between July 2024 and January 2025 decreases in total iron concentrations in groundwater were observed at 6 semi-annually monitored wells (NMW-2R, NMW-3R, NMW-31, NMW-32D, MNW-33 and NMW-34D). Between January 2024 and January 2025, increases in total iron concentrations in groundwater were observed at 3 annually monitored wells (NMW-12, NMW- 13R, and NMW-34D). Between July 2024 and January 2025, increases in total iron concentration were observed in 3 semi-annually monitored wells (NMW-4, NMW-8, and NMW-16) sampled semi-annually. Iron concentrations at down-gradient Upper Zone monitoring well NMW-10 and down-gradient Lower Zone monitoring well NMW-23 remained unchanged and below the MDL of

0.025 mg/L.

Manganese

Total manganese concentrations in groundwater are summarized in Table 3 and Figure 5A and Figure 5B. Plume maps were prepared which show the lateral extent of manganese in Upper Zone groundwater (Figure 10) and Lower Zone groundwater (Figure 11). Between January 2024 and January 2025, decreases in total manganese concentrations in groundwater were observed at 2 annually monitored wells (NMW-11 and NMW-12). Between July 2024 and January 2025, decreases in total manganese concentrations in groundwater were observed at 7 semi-annually monitored wells (NMW-2R, NMW-3R, NMW-23, NMW-31, NMW-32D, MNW-33 and NMW-34D).

Between January 2024 and January 2025, increases in total manganese concentrations in groundwater were observed at 3 annually monitored wells (NMW-13R, NMW-24 and NMW-34D) and between July 2024 and January 2025 increases in total iron concentration were observed in 3 semi-annually monitored wells (NMW-4, NMW-8, and NMW-16). Manganese at down-gradient Upper Zone monitoring well NMW-10 remained unchanged and below the MDL of 1.1 ug/L.

Conductivity

Conductivity values are summarized in Table 3. Between July 2024 and January 2025, decreases in conductivity were observed at 6 semi-annually monitored wells: (NMW-2R, NMW-4, NMW-16, NMW-23, NMW-31 and NMW-32D) and at 5 monitoring wells (NMW-11, NMW-12, NMW-13R, NMW-24 and NMW-34D) sampled annually in January 2024 and January 2025. Increases in conductivity were observed between July 2024 and January 2025 at 2 semi-annually monitored wells: (NMW-3R and NMW-8) and between January 2024 and January 2926 at 1 annually monitored well (NMW-38D). Conductivity values remained unchanged between January 2024 and January 2025 at monitoring well NMW-10 sampled annually and between July 2024 and January 2025 at monitoring well NMW-33 sampled semi-annually.

ORP

Oxidation-reduction potential (ORP) values are summarized in Table 3. There was a downward shift in ORP (to greater negative values) between July 2024 and January 2025 at 2 monitoring wells (NMW-16 and NMW-24) sampled semi-annually, indicating a shift toward more reducing conditions in the aquifer at the well locations. Between July 2024 and January 2025, increases in ORP values (to greater positive values) were observed at 9 semi-annually monitored wells:

(NMW-2R, NMW-3R, NMW-4, NMW-8, NMW-23, NMW-31, NMW-32D, NMW-33 and NMW-34D) and at 5 monitoring wells (NMW-10, NMW-11, NMW-12, NMW-13R and NMW-38D) sampled annually in January 2024 and January 2025.

VOCs

Following the approved changes to the groundwater monitoring program implemented beginning January 2019, groundwater from NMW-13R is no longer analyzed for volatile organic compounds (VOCs). The historic VOC data for NMW-13R is presented in Table 4. As shown in Table 4, during the period 2011-2018 there has only been one GCTL exceedance (vinyl chloride was 1.2 ug/L in 2012, slightly exceeding the MCL of 1.0 ug/L).

Additional MNA Parameters

MNA parameter results for Event #29 are tabulated with earlier results from Events #1 through #28 in Table 3. These MNA parameters included the regularly monitored field-conductivity, field-pH, field-ORP, field-dissolved oxygen, arsenic, iron, and manganese. The results for sulfate, nitrate, phosphate and total organic carbon (TOC) analyzed in January 2019 (Event #17) are also presented in Table 3. Based on direction of FDEP, two previous figures illustrating these parameters have been discontinued from the report, as several new figures illustrating the horizontal extent of iron and manganese in groundwater were added, starting in 2024.

3.0 SUMMARY AND RECOMMENDATIONS

3.1 Summary of January 2025 Natural Attenuation Groundwater Monitoring Activities

1. The former Newton Landfill is located immediately west of U.S. Highway 441 and south of NW 100th Street, at 1750 NW 100th Street, Ocala, Marion County, Florida. Site assessment and groundwater monitoring activities at the site have been conducted from the early 1990s to 2010. The primary constituent detected in concentrations above groundwater cleanup target levels (GCTLs) is arsenic.

2. Field activities for the 29th semi-annual groundwater sampling event were performed by Ideal Tech Services under a contract with Aqua Pure Water and Sewage Services LLC on January 28 and 29, 2025. Groundwater data analysis and semi-annual report preparation were by Andreyev Engineering, Inc. (AEI).

3. January 2025 arsenic groundwater concentrations which exceeded the Florida Groundwater Cleanup Target Level (GCTL) of 10 ug/L were Upper Zone monitoring wells NMW-3R, NMW-4 and NMW-31, and Lower Zone monitoring wells NMW-12, NMW-16, NMW-32D and NMW-34D. Maps showing 10 and 100 ug/L January 2025 arsenic concentration contours for the Upper and Lower groundwater zones are presented in Figures 6 and Figure 7, respectively.

4. On October 19, 2010, the FDEP Central District Waste Cleanup Section determined that Newton Landfill site assessment was complete and approved semi-annual groundwater monitoring in accordance with the current Consent Order. Semi-annual monitoring has been conducted in January and July for fourteen consecutive years starting in 2011. The designated wells for semi-annual monitoring included NMW-2R, NMW-3R, NMW-4, NMW-8, NMW-10, NMW-11, NMW-12, NMW-13R, NMW-16, NMW-23, NMW-24, NMW-

31, NMW-32D, NMW-33, NMW-34D, and NMW-38D. The monitoring parameters for laboratory analysis include arsenic, manganese, and iron.

5. The FDEP June 28, 2013, letter approved certain modifications to the natural attenuation monitoring plan such that NMW-10, NMW-11, NMW-12, NMW-13R, NMW-24 and NMW- 38D are sampled annually in January of each year. Samples from NMW-13 and NMW- 13R were analyzed for VOCs from 2011 to 2018 with only one GCTL exceedance in 2012, before VOC monitoring was discontinued.

6. Water levels were measured and recorded at 31 monitoring wells by Marion County personnel on January 28, 2025. The January 2025 water level data show water levels in both the Upper and Lower groundwater zones were approximately 1.9 feet higher in elevation in comparison to the July 2024 event.

7. For the Upper Zone groundwater, general direction of flow is to the south and southeast, with localized variations in the eastern and western portions of the subject site. During Event #29 a groundwater mound was observed near off-site monitoring well NMW-33, however no groundwater mound was observed at the north end of the site. For Lower Zone groundwater, the general direction of flow is generally to the south, with localized variations in the western portion of the site.

8. Decreases in arsenic groundwater concentration during January 2025 sampling event were observed at 10 of the 16 monitoring wells sampled (NMW-2R, NMW-3R, NMW-4, NMW-8, NMW-10, NMW-11, NMW-13R, NMW-24, NMW-31 and NMW-34D). Between

July 2024 and January 2025, arsenic concentration in semi-annually sampled monitoring wells decreased from 9.9 to 9.7 ug/L at NMW-2R, from 341 to 291 ug/L at NMW-3R, from

93.3 to 71.8 ug/L at NMW-4; from 5.9 to 3.5 ug/L at NMW-8; from 150 to 112 ug/L at NMW- 31 and from 50.2 to 33.5 ug/L at NMW-34D. Between January 2024 and January 2025, arsenic concentration in annually sampled monitoring wells declined from 0.77 to 0.68 ug/L at NMW-10; from 0.94 to 0.77 ug/L at NMW-11; from 1.2 to 1.1 ug/L at NMW-13R and from 1.3 to 1.2 ug/L at NMW-24. Seven of the 10 wells showing recent decreases (NMW-2R, NMW-3R, NMW-4 and NMW-8, NMW-10, NMW-24 and NMW-31) have well screens in the Upper groundwater Zone and three wells (NMW-11, NMW-13R and NMW- 34D) are screened in the Lower Groundwater Zone.

9. Increases in arsenic groundwater concentrations during the January 2025 sampling event were observed at 4 monitoring wells: (NMW-12, NMW-16, NMW-23 and NMW-32D).

Between July 2024 and January 2025, arsenic concentration in semi-annually monitored wells increased from 64.5 to 181 ug/L at NMW-16; from 2.6 to 2.7 ug/L at NMW-23 and from 144 to 147 ug/L at NMW-32D. Increase in arsenic groundwater concentration was observed at annually monitored well NMW-12 sampled during January 2024 and January 2025, from 134 to 157 ug/L. All the four monitoring wells showing a recent increase in arsenic concentration (NMW-12, NMW-16, NMW-23 and NMW-32D) have well screens in the Lower Groundwater Zone.

10. The average percentage change in arsenic concentration (as a percentage change from the July 2024 arsenic concentrations for semi-annual wells and from January 2024 arsenic concentrations for annual wells) was an increase of 1.18% for all 16 monitoring wells sampled during January 2025 sampling event. Noteworthy percentage decreases in arsenic concentration were at NMW-8 (down 40.7%) and NMW-34D (down 33.3%).

Noteworthy percentage increases in arsenic concentration were at NMW-16 (up 180.6%) and NMW-12 (up 17.2%).

11. It is noteworthy that arsenic concentration trends have been downward at certain key wells, including Upper Zone NMW-8 (considered the off-site background well and located on the north side of the landfill). Arsenic concentrations declined below the GCTL of 10 ug/L at NMW-8 in January 2020 and have remained below the GCTL for eleven consecutive monitoring events starting January, 2020. The apparent decline in arsenic concentration began at NMW-8 starting with the January 2018 sampling event. Also, arsenic concentrations at NMW-2R have been below the GCTL of 10 ug/L for three sampling events between January 2022 and January 2023 and were below the GCTL during January 2024 through January 2025 sampling events. NMW-2R is an Upper Zone monitoring well located at the north end of the landfill.

12. Lower Zone NMW-16 (located off-site on the south side of the landfill) showed a significant increase in arsenic concentration during the January 2025 sampling event, from 64.5 ug/L in July 2024 to 181 ug/L in January 2025. Arsenic concentration in monitoring well NMW- 16 had previously shown a decline from January 2020 to January 2023 and during January 2024 and July 2024 sampling events.

13. Total manganese concentrations in groundwater are summarized in Table 3 and Figure 5A and Figure 5B. Plume maps were prepared which show the lateral extent of manganese in Upper Zone groundwater (Figure 10) and Lower Zone groundwater (Figure 11). Between January 2024 and January 2025, decreases in total manganese concentrations in groundwater were observed at 2 annually monitored wells (NMW-11 and NMW-12). Between July 2024 and January 2025, decreases in total manganese concentrations in groundwater were observed at 7 semi-annually monitored wells (NMW- 2R, NMW-3R, NMW-23, NMW-31, NMW-32D, MNW-33 and NMW-34D). Between

January 2024 and January 2025, increases in total manganese concentrations in groundwater were observed at 3 annually monitored wells (NMW-13R, NMW-24 and NMW-34D) and between July 2024 and January 2025 increases in total iron concentration were observed in 3 semi-annually monitored wells (NMW-4, NMW-8, and NMW-16).

Manganese concentration at down-gradient Upper Zone monitoring well NMW-10 remained unchanged and below the MDL of 1.1 ug/L.

14. Total iron concentrations in groundwater are summarized in Table 3. Plume maps were prepared which show the horizontal extent of total iron in Upper Zone groundwater (Figure

8) and Lower Zone groundwater (Figure 9). Between January 2024 and January 2025, decreases in total iron concentrations in groundwater were observed at 2 annually monitored wells (NMW-11 and NMW-24). Between July 2024 and January 2025 decreases in total iron concentrations in groundwater were observed at 6 semi-annually monitored wells (NMW-2R, NMW-3R, NMW-31, NMW-32D, MNW-33 and NMW-34D).

Between January 2024 and January 2025, increases in total iron concentrations in groundwater were observed at 3 annually monitored wells (NMW-12, NMW-13R, and NMW-34D). Between July 2024 and January 2025, increases in total iron concentration were observed in 3 semi-annually monitored wells (NMW-4, NMW-8, and NMW-16) sampled semi-annually. Iron concentrations at down-gradient Upper Zone monitoring well NMW-10 and down-gradient Lower Zone monitoring well NMW-23 remained unchanged and below the MDL of 0.025 mg/L.

15. Marion County has typically asked owners of adjacent properties to allow the County to sample their private wells during semi-annual groundwater sampling events. Marion County sent out permission slips and a description of the testing program to nearby well owners, however no volunteers requested their private wells be sampled as part of the January 28-29, 2025 groundwater sampling event.

16. An upgradient replacement well of NMW-8 had been recommended based on findings of the last trend analysis report (2018). However, arsenic concentration at this upgradient well has remained below the GCTL for the past eleven sampling events. The FDEP review letter dated May 5, 2023, suggested that the replacement of NMW-8 as an up-gradient monitoring well may be indicated in the future, but is not required at this time.

17. Based on the FDEP statement in the May 5, 2023 response letter, Marion County will continue to monitor NMW-8 as a background monitoring well and not replace this well for the time being. Marion County is continuing to make plans to add a deeper off-site Lower Zone monitoring well downgradient of the landfill. Marion County has been communicating with the adjacent property owner to the south to obtain permission to drill this Lower Zone monitoring well in vicinity of NMW-10 and NMW-11. AEI enquired with qualified drillers and obtained pricing to conduct this deep well installation.

3.2 Recommendations

1. Based on the results of the January 2025 semi-annual groundwater monitoring, it is recommended that the semi-annual groundwater monitoring at the landfill site be continued with the monitoring network consisting of 16 monitoring wells (10 wells sampled semi-annually, 6 additional wells sampled annually, thus sampling 16 wells during annual monitoring in January).

2. During groundwater monitoring event #30 (July 2025) a total of 18 monitoring wells should be sampled. This includes 6 monitoring wells that need to be redeveloped prior to sampling, and 2 wells which do not require redevelopment (see last paragraph of Section 1.1).

3. The addition of a deeper downgradient Lower Zone monitoring well is still needed. Marion

County should continue to pursue permission to drill an additional off-site downgradient Lower Zone monitoring well in the vicinity of NMW-10 and NMW-11.

4. The next semi-annual groundwater monitoring event will be conducted in July 2025, and the next semi-annual report will be submitted to FDEP by September 30, 2025.

TABLES

TABLE 1

Groundwater Monitoring Well Construction Summary Former Newton Landfill, 1750 NW 100th Street

Ocala, Marion County, Florida

Well No.

WACs

Number

Total

Depth (ft)

Screen

Length (ft)

Screened Interval, ft, NGVD1, 2

MPIS Designation

NMW-2R

12754

83.62

46.6 to 26.6

Background, upper surficial

NMW-3R

12755

129.00

43.1 to 23.1

Compliance, upper surficial

NMW-4

12959

105.58

44.1 to 24.1

NMW-5

12960

98.82

44.4 to 24.4

NMW-6

12961

108.33

46.3 to 26.3

NMW-7R5

12962

128.00

29.5 to 9.5

NMW-8

12963

80.53

41.4 to 21.4

NMW-10

12964

117.26

45.6 to 25.6

NMW-11

12965

143.63

5.6 to -4.4

Compliance, lower surficial

NMW-12

12966

143.56

16.3 to 6.3

NMW-13R

12967

118.70

1.53 to -8.47

NMW-155

12968

137.55

16.4 to 1.4

NMW-16

21604

-20.2 to -30.2

Assessment, lower surficial

NMW-17

21065

34.4 to 24.4

Assessment, upper surficial3

NMW-18

21066

3.7 to -6.3

NMW-21

21067

38.7 to 28.7

Assessment, upper surficial3

NMW-22

21068

8.8 to -1.2

NMW-23

22307

-40.3 to -50.3

NMW-24

NA4

22.25 to 7.25

Assessment, upper surficial

NMW-25D

NA

-12.7 to -22.7

NMW-26D

-8.7 to -18.7

NMW-27

41.38 to 26.38

NMW-28D

-3.13 to -13.3

NMW-29

30.34 to 15.34

NMW-30D

-13.85 to -23.85

NMW-31

45.64 to 30.64

NMW-32D

0.32 to -9.68

MNW-33

38.39 to 23.39

NMW-34D

-6.4 to -16.4

NMW-35

41.6 to 26.6

NMW-36D

-3.52 to -13.52

NMW-37D

-6.38 to -16.38

NMW-38D

-4.5 to -14.5

Notes: 1. NGVD = National Geodetic Vertical Datum.

2. The screened interval is reported in feet, and referenced to NGVD from the top of the well screen to the bottom.

3. The zones screened by Monitoring wells NMW-17 and NMW-21 are designated “upper” in this semi-annual report and hereafter, based on screen interval elevation. 4. NA = Not Assigned

5. Monitoring wells NMW-7R and NMW-15 were abandoned on September 11, 2013, to allow site improvements in 2014.

Facility Name: Former Newton Landfill Facility ID#: ERIC-11054 All Measurements = Feet

1750 NW 100th Street, Ocala, Marion County, FL NM = Not Measured

Screen Interval is in ft, NGVD

Blank = No Data

WELL NO. NMW-2 NMW-2R NMW-3 NMW-3R NMW-4 NMW-5

DIAMETER 2" 2" 2" 2" 2" 2"

WELL DEPTH 78.45 83.62 114.63 129.00 105.58 98.82

SCREEN INTERVAL 50.2 to 30.2 46.61 to 26.61 53.7 to 33.7 43.05 to 23.05 44.1 to 24.1 44.4 to 24.4

TOC ELEVATION 107.68 110.23 152.39 152.05 129.13 122.93

DATE ELEV DTW ELEV DTW ELEV DTW ELEV DTW ELEV DTW ELEV DTW

12/29/2010 43.66 64.20 42.46 109.93 47.76 81.37 41.67 81.26

7/5/2011 41.53 66.13 42.08 110.31 45.37 83.76 41.01 81.92

1/12/2012 42.31 65.35 42.25 110.14 40.62 88.51 40.63 82.30

7/7/2012 42.57 65.09 42.20 110.19 42.16 86.97 42.28 80.65

1/25/2013 42.66 65.00 41.95 110.44 42.00 87.13 42.07 80.86

7/26/2013 42.22 65.44 NM dry 40.63 88.50 41.76 81.17

1/10/2014 Abandoned 42.75 109.64 42.66 86.47 42.79 80.14

7/11/2014 Abandoned 44.41 107.98 44.46 84.67 44.55 78.38

1/9/2015 Abandoned 44.47 65.76 Abandoned 43.75 108.30 43.91 85.22 43.94 78.99

7/10/215 Abandoned 42.94 67.29 Abandoned 42.47 109.58 42.56 86.57 42.61 80.32

1/8/2016 Abandoned 43.27 66.96 Abandoned 42.81 109.24 42.89 86.24 42.99 79.94

7/8/2016 Abandoned 42.28 67.95 Abandoned 41.75 110.30 41.82 87.31 41.95 80.98

1/6/2017 Abandoned 41.74 68.49 Abandoned 41.35 110.70 41.60 87.53 41.52 81.41

7/1/2017 Abandoned 41.66 68.57 Abandoned 41.02 111.03 41.10 88.03 41.17 81.76

1/19/2018 Abandoned 44.64 65.59 Abandoned 44.18 107.87 44.26 84.87 44.35 78.58

7/19/2018 Abandoned 46.20 64.03 Abandoned 45.71 106.34 45.78 83.35 45.86 77.07

1/2/2019 Abandoned 46.83 63.40 Abandoned 46.83 105.22 46.88 82.25 46.96 75.97

7/29/2019 Abandoned 45.00 65.23 Abandoned 44.68 107.37 44.72 84.41 44.80 78.13

1/20/2020 Abandoned 44.95 65.28 Abandoned 44.47 107.58 44.56 84.57 44.64 78.29

7/14/2020 Abandoned 43.56 66.67 Abandoned 43.15 108.90 43.19 85.94 43.68 79.25

1/18/2021 Abandoned 43.25 66.98 Abandoned 42.82 109.23 42.92 86.21 42.99 79.94

7/26/2021 Abandoned 44.90 65.33 Abandoned 44.31 107.74 44.38 84.75 44.46 78.47

1/18/2022 Abandoned 44.16 66.07 Abandoned 43.71 108.34 43.78 85.35 43.85 79.08

7/26/2022 Abandoned 43.40 66.83 Abandoned 42.94 109.11 43.00 86.13 43.13 79.80

1/18/2023 Abandoned 43.36 66.87 Abandoned 42.91 109.14 42.98 86.15 43.07 79.86

7/25/2023 Abandoned 45.30 64.93 Abandoned 44.65 107.40 44.71 84.42 44.80 78.13

1/23/2024 Abandoned 44.53 65.70 Abandoned 43.90 108.15 43.95 85.18 44.05 78.88

7/22/2024 Abandoned 42.63 67.60 Abandoned 42.24 109.81 42.31 86.82 42.41 80.52

1/28/2025 Abandoned 44.56 65.67 Abandoned 44.46 107.93 44.20 84.93 44.29 78.64

WELL NO. NMW-6 NMW-7R NMW-8 NMW-10 NMW-11 NMW-12

DIAMETER 2" 2" 2" 2" 2" 2"

WELL DEPTH 108 128 81 117 144 144

SCREEN INTERVAL 46.3 to 26.3 29.5 to 9.5 41.4 to 21.4 45.6 to 25.6 5.6 to -4.4 16.3 to 6.3

TOC ELEVATION 134.84 140.59 104.88 139.1 138.12 151.62

DATE ELEV DTW ELEV DTW ELEV DTW ELEV DTW ELEV DTW ELEV DTW

12/29/2010 41.55 93.29 44.09 96.50 42.16 62.72 40.63 98.47 41.11 97.01 42.83 108.79

7/5/2011 40.66 94.18 42.12 98.47 41.26 63.62 39.80 99.30 40.28 97.84 40.87 110.75

1/12/2012 40.34 94.50 40.89 99.70 40.88 64.00 39.39 99.71 39.90 98.22 40.62 111.00

7/7/2012 41.87 92.97 42.16 98.43 42.29 62.59 40.98 98.12 41.48 96.64 42.15 109.47

1/25/2013 41.86 92.98 42.32 98.27 42.53 62.35 40.81 98.29 41.30 96.82 41.95 109.67

7/26/2013 41.45 93.39 41.75 98.84 41.90 62.98 40.51 98.59 41.01 97.11 41.64 109.98

1/10/2014 42.53 92.31 NM 43.05 61.83 41.47 97.63 41.96 96.16 42.64 108.98

7/11/2014 44.21 90.63 NM 45.00 59.88 43.25 95.85 43.74 94.38 44.42 107.20

1/9/2015 43.61 91.23 NM 44.37 60.51 42.68 96.42 43.12 95.00 43.77 107.85

7/10/2015 NM Abandoned 42.91 61.97 41.30 97.80 41.87 96.25 42.51 109.11

1/8/2016 42.69 92.15 Abandoned 43.23 61.65 41.67 97.43 42.16 95.96 42.85 108.77

7/8/2016 39.64 95.20 Abandoned 42.22 62.66 40.67 98.43 41.08 97.04 41.80 109.82

1/6/2017 41.24 93.60 Abandoned 41.75 63.13 40.25 98.85 40.76 97.36 41.38 110.24

7/1/2017 40.87 93.97 Abandoned 41.55 63.33 39.90 99.20 40..39 97.73 41.04 110.58

1/19/2018 44.07 90.77 Abandoned 44.63 60.25 43.10 96.00 43.58 94.54 43.91 107.71

7/19/2018 45.59 89.25 Abondoned 46.13 58.75 44.60 94.50 45.07 93.05 45.74 105.88

1/2/2019 46.68 88.16 Abondoned 47.27 57.61 45.72 93.38 46.18 91.94 46.86 104.76

7/29/2019 44.53 90.31 Abondoned 45.24 59.64 43.56 95.54 44.08 94.04 44.70 106.92

1/20/2020 44.36 90.48 Abandoned 44.38 60.50 43.36 95.74 43.87 94.25 44.50 107.12

7/14/2020 43.00 91.84 Abandoned 43.51 61.37 42.01 97.09 42.50 95.62 43.19 108.43

1/1/8/2021 42.69 92.15 Abandoned 43.23 61.65 41.70 97.40 42.2 95.92 42.85 108.77

7/26/2021 44.16 90.68 Abandoned 44.78 60.1 43.17 95.93 43.69 94.43 44.34 107.28

1/18/2022 43.6 91.24 Abandoned 44.1 60.78 42.59 96.51 43.11 95.01 43.74 107.88

7/26/2022 42.83 92.01 Abandoned 43.35 61.53 41.84 97.26 42.32 95.80 42.98 108.64

1/18/2023 42.80 92.04 Abandoned 43.34 61.54 41.81 97.29 42.30 95.82 42.94 108.68

7/25/2023 44.52 90.32 Abandoned 45.20 59.68 43.51 95.59 44.01 94.11 44.67 106.95

1/23/2024 43.78 91.06 Abandoned 44.47 60.41 42.78 96.32 43.28 94.84 43.92 107.70

7/22/2024 42.14 92.70 Abandoned 42.59 62.29 41.14 97.96 41.63 96.49 42.27 109.35

1/28/2025 43.98 90.86 Abandoned 44.56 60.32 43.03 96.07 43.51 94.61 44.16 107.46

TABLE 2: GROUNDWATER ELEVATION TABLE

Facility Name: Former Newton Landfill Facility ID#: ERIC_11054 All Measurements = Feet

Screen Interval is in ft, NGVD

Blank = No Data

WELL NO. NMW-13 NMW-13R NMW-15 NMW-16 NMW-17 NMW-18

DIAMETER 2" 2" 2" 2" 2" 2"

WELL DEPTH 113.78 118.70 137.55 180.00 120.00 150.00

SCREEN INTERVAL 9.2 to -0.8 1.53 to -8.47 16.4 to 1.4 -20.2 to -30.2 34.4 to 24.4 3.7 to -6.3

TOC ELEVATION 108.91 110.31 138.93 152.28 146.92 146.24

DATE ELEV DTW ELEV DTW ELEV DTW ELEV DTW ELEV DTW ELEV DTW

12/29/2010 41.91 67.00 42.55 96.38 41.75 110.53 41.72 105.20 41.64 104.60

7/5/2011 40.83 68.08 40.73 98.20 40.83 111.45 40.82 108.10 40.79 105.45

1/12/2012 40.59 68.32 39.53 99.40 40.56 111.72 40.52 106.40 40.49 105.75

7/7/2012 42.04 66.87 40.80 98.13 42.13 110.15 42.08 104.84 42.05 104.19

1/25/2013 41.99 66.92 40.96 97.17 41.92 110.36 41.93 104.99 41.85 104.39

7/26/2013 41.59 67.32 40.39 98.54 41.61 110.67 41.57 105.35 41.54 104.70

1/10/2014 NM NM 42.61 109.67 42.58 104.34 42.52 103.72

7/11/2014 NM NM 44.40 107.88 44.36 102.56 44.31 101.93

1/9/2015 NM 44.25 65.98 NM 43.73 108.55 43.73 103.19 43.66 102.58

7/10/2015 Abandoned 42.89 67.42 Abandoned 42.50 109.78 42.48 104.44 42.41 103.83

1/8/2016 Abandoned 43.21 67.10 Abandoned 42.82 109.46 42.79 104.13 42.76 103.48

7/8/2016 Abandoned 42.23 68.00 Abandoned 41.75 110.53 41.74 105.17 41.69 104.55

1/6/2017 Abandoned 41.71 68.60 Abandoned 41.36 110.92 41.35 105.57 41.29 104.95

7/1/2017 Abandoned 41.60 68.71 Abandoned 41.02 111.26 41.01 105.91 40.95 105.29

1/19/2018 Abandoned 44.57 65.74 Abandoned 44.18 108.10 44.18 102.74 44.12 102.12

7/19/2018 Abandoned 46.11 64.20 Abandoned 45.70 106.58 45.70 101.22 45.64 100.60

1/2/2019 Abandoned 47.44 62.87 Abandoned 46.83 105.45 46.79 100.13 46.73 99.51

7/29/2019 Abandoned 45.26 65.05 Abandoned 44.67 107.61 44.65 102.27 44.60 101.64

1/20/2020 Abandoned 44.87 65.44 Abandoned 44.45 107.83 44.48 102.44 44.41 101.83

7/14/2020 Abandoned 43.51 66.80 Abandoned 43.17 109.11 43.15 103.77 43.08 103.16

1/18/2021 Abandoned 43.20 67.11 Abandoned 42.83 109.45 42.83 104.09 42.76 103.48

7/26/2021 Abandoned 44.79 65.52 Abandoned 44.33 107.95 44.31 102.61 44.24 102.00

1/18/2022 Abandoned 44.11 66.20 Abandoned 43.72 108.56 43.72 103.20 43.65 102.59

7/26/2022 Abandoned 43.35 66.96 Abandoned 42.97 109.31 42.95 103.97 42.88 103.36

1/18/2023 Abandoned 43.29 67.02 Abandoned 42.92 109.36 42.92 104.00 42.84 103.40

7/25/2023 Abandoned 45.19 65.12 Abandoned 44.63 107.65 44.64 102.28 44.57 101.67

1/23/2024 Abandoned 44.42 65.89 Abandoned 43.90 108.38 43.88 103.04 43.83 102.41

7/22/2024 Abandoned 42.56 67.75 Abandoned 42.27 110.01 42.23 104.69 42.16 104.08

1/28/2025 Abandoned 44.51 65.80 Abandoned 44.15 108.13 44.12 102.80 44.06 102.08

WELL NO. NMW-21 NMW-22 NMW-23 NMW-24 NMW-25D NMW-26D

DIAMETER 2" 2" 2" 2" 2" 2"

WELL DEPTH 120.00 150.00 200.00 105.00 145.00 145.00

SCREEN INTERVAL 38.7 to 28.7 8.8 to -1.2 -40.3 to -50.3 22.25 to 7.25 -12.7 to -22.7 8.7 to -18.7

TOC ELEVATION 151.23 151.34 152.99 122.41 122.56 130.16

DATE ELEV DTW ELEV DTW ELEV DTW ELEV DTW ELEV DTW ELEV DTW

12/29/2010 41.73 109.50 41.92 109.42 42.01 110.98 41.80 80.61 41.93 80.63 41.93 88.23

7/5/2011 40.83 110.40 41.04 110.30 41.10 111.89 40.90 81.51 41.02 81.54 41.03 89.13

1/12/2012 40.53 110.70 40.74 110.60 40.85 112.14 40.70 81.70 40.80 81.76 40.73 89.43

7/7/2012 42.04 109.19 42.30 109.04 42.34 110.65 42.15 80.26 42.28 80.28 42.31 87.85

1/25/2013 41.90 109.33 42.13 109.21 42.21 110.78 42.03 80.38 42.11 80.45 42.12 88.04

7/26/2013 41.54 109.69 41.80 109.54 41.87 111.12 41.63 80.78 41.75 80.81 41.80 88.36

1/10/2014 42.56 108.67 42.80 108.54 42.85 110.14 42.72 79.69 42.80 79.76 42.83 87.33

7/11/2014 44.36 106.87 44.58 106.76 44.66 108.33 44.50 77.91 44.61 77.95 44.63 85.53

1/9/2015 43.71 107.52 43.93 107.41 44.00 108.99 43.83 78.58 43.90 78.66 43.96 86.20

7/10/2015 42.36 108.87 42.69 108.65 42.74 110.25 42.60 79.81 42.68 79.88 42.70 87.46

1/8/216 42.80 108.43 43.03 108.31 43.08 1009.91 42.93 79.48 43.02 79.54 43.03 87.13

7/8/2016 41.74 109.49 41.97 109.37 42.02 110.97 41.87 80.54 41.97 80.59 41.98 88.18

1/6/2017 41.34 109.89 41.56 109.78 41.64 111.35 41.46 80.95 41.58 80.98 41.59 88.57

7/1/2017 41.00 110.23 41.23…