I_Final_CC_GWTF_2024_Annual_Letter_Report.pdf

Installation Restoration ProgramInstallation Restoration Program

Canal Creek Study Area East Branch Groundwater Treatment Facility 2024 Annual Letter Report (January – December 2024) March 2025

U.S. Army Garrison

Aberdeen Proving Ground, Maryland

Distribution Restriction

Statement Approved for Public Release Distribution is Unlimited

# 250414-01

This Page Intentionally Left Blank.

Office

3417 Sunset Avenue

Ocean Township, NJ 07712

Phone: (732)-659-1000

Regional Office

1304 Governor Court

Suite 101

Abingdon, MD 21009

Phone: (410) 671-2970 www.ecc.net

11 March 2025

Mr. Rurik Loder

U.S. Army Garrison Aberdeen Proving Ground

Directorate of Public Works

ATTN: AMIM-APP-E

Aberdeen Proving Ground, Maryland 21005

Reference: Contract No. W56ZTN-17-D-0009

Delivery Order No. W56ZTN-21-F-0110

Subject: Canal Creek Groundwater Treatment Facility 2024 Annual Letter

Report (January – December 2024)

Dear Mr. Loder:

This annual letter report summarizes the operations of the Canal Creek

Groundwater Treatment Facility (GWTF) during the 2024 calendar year. The twelve Monthly Status Reports are included as Attachment 1.

The following operations activities and observations were noted during the reporting period:

• The GWTF and well field had average yearly runtimes of 98.3%.

• Approximately 57,453,000 gallons of water were treated at average monthly total extraction well flow rates ranging from 106 to 119 gallons per minute.

• Total volatile organic compound (VOC) concentrations in the plant influent fluctuated between 155.61 µg/L and 232.25 µg/L during 2024.

Total influent VOCs have shown an overall downward trend since 2009, averaging 284.44 µg/L. Total VOC concentrations averaged 615.41 µg/L during the first year of plant operation (May 2003 to May 2004).

• No effluent concentrations of VOCs were detected above the National

Pollutant Discharge Elimination System (NPDES) equivalency performance goal of 100 g/L. Effluent concentrations of copper, zinc, and heptachlor epoxide were also below the NPDES equivalency requirements.

• Groundwater elevation data collected quarterly during the year indicated that the active extraction system continued to capture the VOC target zone

(100 g/L in groundwater).

http://www.ecc.net/

11 March 2025

• Due to a localized increase of groundwater VOC concentrations from 2013 to 2017, extraction well

EW-8 continued on a 30 days on and 30 days off schedule during 2024. Since initiating the cycling operation of EW-8 in 2017, sampling data shows an approximately 43% reduction in target total

VOC concentrations, averaging 119 µg/L. Compared to the 2023 results (108.9 ug/L), sampling data from 2024 decreased in target total VOC concentrations (92 ug/L). Although sampling data from 2024 continues to show a reduction in total target VOC concentrations, EW-8 will continue to operate with the 30 days on and 30 days off schedule during calendar year 2025.

• The 2.5 year long-term monitoring (LTM) groundwater sampling event was conducted during

October 2024. These results will be included in the Canal Creek LTM Report #7 (provided separately).

• During the reporting period the longest shutdown logged for the well field and GWTF occurred in

March 2024. The well field and GWTF were disabled for approximately 117.88 hours for the scheduled acid washing of the GWTF.

• Operations and Maintenance highlights during 2024 included the following: changeout of the vapor carbon (completed during February), acid washing of the GWTF to clear calcified lime from the interior of the T-2 (lime reaction) tank gravity feed line (completed in March), installation of a new pump and motor for extraction well EW-1 (completed in October), and replacement of the mechanical seal for the Moyno sludge pump (completed during November).

• The annual land use control (LUC) inspection was completed during 2024. The LUC requirements listed in the Final Remedial Action East Canal Creek Area Plume Canal Creek Aquifer Record of

Decision (July 2000) were met. There was no evidence of unauthorized groundwater use, soil excavation, or drinking water/groundwater well installation. Signs were present on the Canal Creek

GWTF and the extraction well boxes.

• Based on sampling results for 2024, extraction rates well rates and extraction well operations should stay the same for the 2025 calendar year.

For additional details, please refer to Attachment 1.

Please contact me at (410) 671-2970 should you have any questions or concerns.

Sincerely, Helen Cavanagh

ECC

cc: D. Reault, ECC

Attachment 1 Canal Creek Groundwater Treatment Facility 2024 Monthly Status Reports

CANAL CREEK GROUNDWATER TREATMENT FACILITY

MONTHLY STATUS REPORT

Month: January 2024

Reporting Period: 1/1/2024 – 1/31/2024

Cumulative Influent Flow: 1,185,741,598 gal

Cumulative Effluent Flow: 1,195,935,148 gal

Executive Summary:

The Canal Creek Groundwater Treatment Facility (GWTF) had a runtime of 99.7% and the well field had a runtime of 99.9% for the month of January 2024. The NPDES equivalency discharge criteria were met for the month. Due to a localized increase of groundwater

VOC concentrations, extraction well EW-8 continued on a 30 days on and 30 days off schedule. EW-8 was restarted on 1/29/24 and is scheduled to be disabled at the end of February 2024.

Well ID

January

Monthly Flow

(gal)

Total Flow

(2004-2024)

(gal)

EW-1 391,900 87,598,212

EW-2 0 18,413,853

EW-3 0 21,984,928

EW-4 1,178,547 258,499,151

EW-5 1,312,000 228,009,934

EW-6 1,245,000 226,311,290

EW-7 1,390,000 244,228,794

EW-8 93,872 100,695,436

Total 5,611,319 1,185,741,598

Note:

• In addition to EW-8, the active extraction system consisted of five extraction wells (EW-1, EW-4, EW-5, EW-6, and EW-7) during the month. Consistent operation of the five well extraction system provides adequate capture of the target total VOC 100 μg/L isocontour.

• EW-2 and EW-3 remained offline because their operation is not needed to capture the current VOC plume area.

• The average monthly flow rate of the well field was 113 gallons per minute.

• Bag filter life ranged from 4 days 20 hours 55 minutes to 8 days 22 hours 33 minutes and averaged 6 days 10 hours 13 minutes for the month.

Operation Shutdown Summary:

1) Groundwater feed pumps:

Restart Duration

(hours)

Wells

Affected Reason for Shutdown

Date Time Date Time

1/3/24 11:36 1/3/24 12:23 0.78 All Wells Well field was disabled to clean the T-2 (lime reaction) tank gravity feed line.

2) Plant operation:

Reason for Shutdown/Recirculation Mode

Date Time Date Time

1/3/24 7:37 1/3/24 8:31 0.9 GWTF was disabled to clean the T-2 tank gravity feed line.

1/3/24 11:00 1/3/24 12:11 1.18 GWTF was disabled to clean the T-2 tank gravity feed line.

Operation and Maintenance Summary:

01/03/24 Removed debris from T-2 (lime reaction) tank gravity feed line.

01/05/24 Performed short duration backwashes of resin vessels.

01/08/24 Installed new drum shakers on T-3 (neutralization) tank gravity feed line to prevent obstructions from forming.

01/09/24 Performed short duration backwashes of resin vessels.

01/10/24 Turned on the composite sampler.

01/11/24 Collected monthly NPDES equivalency samples.

01/16/24 Performed short duration backwashes of resin vessels, Initiated the regeneration of resin vessel C-4.

01/17/24 Completed the regeneration of resin vessel C-4.

01/22/24 Performed short duration backwashes of resin vessels, Initiated the regeneration of resin vessel C-2, Reviewed and updated the plant Hazmat inventory, Resin vessels steam trap manifold stopped working (scheduled repairs with

DPW and step-advanced the regeneration).

01/23/24 Completed the regeneration of resin vessel C-2.

01/24/24 DPW personnel completed repairs to the resin vessels steam trap manifold, Completed monthly safety inspection, Cleaned and organized plant fire lockers, Repaired basement door.

01/26/24 Performed short duration backwashes of the carbon units.

01/29/24 Turned on extraction well EW-8, DPW personnel completed Hazmat inspection.

Health and Safety: The following topics were discussed during the month: Why shoveling snow can be dangerous, Equipment Blind Spots, Refocus on Safety, and I opened the Window and Influenza.

Process Chemical Deliveries: Subcontractor (Carmeuse) delivered 4,600 gallons of lime slurry (1/4/24), Subcontractor

(Coyne Chemical) delivered 10 gallons of ascorbic acid (1/18/24) , Subcontractor delivered 3,000 pounds of vapor carbon

(1/25/24).

Process Waste Disposals: Contractor (Veolia) picked up 24 spent liquid carbon drums, 4 spent bag filter drums, and 1 spent polymer drum (1/3/24).

Sampling Activities:

Results for the GWTF samples that were collected in January are provided below:

Note:

• Samples collected during the month indicated that the plant was compliant with all required discharge criteria. The treatment goal for effluent total VOCs is < 100 µg/L.

• The resin vessels are only sampled when in the primary position.

• Performance samples were not collected the third week of the month due to the need of regenerations for resin vessels C-4 (completed on 1/17/24) and C-2 (completed on 1/23/24).

Sampling Location Total VOCs (µg/L)

1/4/24 1/11/24 1/25/24

Influent (INF) Not Sampled 187.72 Not Sampled

Bag Filter Effluent (BFE) 137.2 134.9 134.1

Resin Vessel C-1 Not Sampled Not Sampled 37.96

Resin Vessel C-2 44.58 56.96 Not Sampled

Resin Vessel C-3 Not Sampled Not Sampled 29.77

Resin Vessel C-4 62.28 70.11 Not Sampled

Before Carbon Units (BCU) 13.33 20.8 4.3

After Primary Carbon Unit (ACU1) Not Sampled Not Sampled Not Sampled

After Secondary Carbon Unit (ACU2) Not Sampled 19.85 Not Sampled

Plant Effluent (EFF) Not Sampled 17.26 Not Sampled

Vapor Collection Monitoring Results:

• In accordance with the GWTF O&M manual, change out of the vapor carbon units is necessary when the intermediate PID readings (collected between the two carbon vessels) consistently approaches 67 percent of the influent concentration. The last change out was completed on 16 August 2021 and the next replacement is scheduled for the first quarter 2024.

• The Gas Alert Micro 5 PID is calibrated and verified according to factory specifications prior to collecting the readings.

Location PID (ppm)

1/5/24 1/12/24 1/19/24 1/26/24

Background 0 0 0 0

Vapor Collection Influent 0 0 2 2

Vapor Collection Intermediate 2 2 2 2

Vapor Collection Effluent 2 2 2 2

Month: February 2024

Reporting Period: 2/1/2024 – 2/29/2024

Cumulative Influent Flow: 1,190,575,039 gal

Cumulative Effluent Flow: 1,200,692,148 gal

The Canal Creek Groundwater Treatment Facility (GWTF) and the well field had runtimes of 100% for the month of February 2024. The year to date runtimes for the GWTF and the well field are both 99.9%. The NPDES equivalency discharge criteria were met for the month. Due to a localized increase of groundwater VOC concentrations, extraction well EW-8 continued on a 30 days on and 30 days off schedule. EW-8 was disabled on 2/26/24 and is scheduled to be restarted at the end of March 2024.

February

Monthly Flow

(gal)

Total Flow

(2004-2024)

(gal)

EW-1 304,360 87,902,572

EW-2 0 18,413,853

EW-3 0 21,984,928

EW-4 935,103 259,434,254

EW-5 1,031,000 229,040,934

EW-6 960,000 227,271,290

EW-7 1,065,000 245,293,794

EW-8 537,978 101,233,414

Total 4,833,441 1,190,575,039

Note:

• In addition to EW-8, the active extraction system consisted of five extraction wells (EW-1, EW-4, EW-5, EW-6, and EW-7) during the month. Consistent operation of the five well extraction system provides adequate capture of the target total VOC 100 μg/L isocontour.

• The average monthly flow rate of the well field was 119 gallons per minute.

• Bag filter life ranged from 5 days 16 hours 32 minutes to 7 days 13 hours 47 minutes and averaged 6 days 21 hours 30

1) Groundwater feed pumps: The well field was 100 percent operational for the month.

2) Plant operation: The GWTF was 100 percent operational for the month.

02/06/24 Performed short duration backwashes of resin vessels, Rebuilt and repaired 2-inch AOD pump.

02/07/24 Turned on the composite sampler, Completed vapor carbon change out for CA-1B unit.

02/08/24 Completed vapor carbon change out for CA-1A unit, Collected monthly NPDES equivalency samples.

02/09/24 Performed short duration backwashes of resin vessels, Cleared sand from ME-3B sand filter air lift pump.

02/12/24 Performed short duration backwashes of resin vessels.

02/15/24 Performed short duration backwashes of resin vessels.

02/20/24 Cleaned sump pump check valve and trap, Cleaned tops of sand filters.

02/21/24 Completed monthly safety inspection.

02/22/24 DPW personnel repaired GWTF exterior downspout, Performed short duration backwashes of resin vessels.

02/26/24 Turned off extraction well EW-08, Initiated the regeneration of resin vessel C-1.

Operation and Maintenance Summary (cont’d):

02/27/24 Replaced the T-4 (repump) tank pH probe, Completed the regeneration of resin vessel C-1, DPW personnel determined that the steam safety valve does not need to be replaced.

Health and Safety: The following topics were discussed during the month: Winter Fatigue, Scissor Lift Safety, Work

Together, Lookout for Each Other, and Fall Protection, Process Chemical Deliveries: None.

Process Waste Disposals: Contractor (Veolia) picked up 4,599 gallons of sludge (2/14/24).

Results for the GWTF samples that were collected in February are provided below:

• Samples collected during the month indicated that the plant was compliant with all required discharge criteria. The treatment goal for effluent total VOCs is < 100 µg/L.

• The resin vessels are only sampled when in the primary position.

• Performance samples were not collected the fourth week of the month due to the need of a regeneration for resin vessel

C-1 (completed on 2/27/24).

• In accordance with the GWTF O&M manual, change out of the vapor carbon units is necessary when the intermediate PID readings (collected between the two carbon vessels) consistently approaches 67 percent of the influent concentration. The vapor carbon was replaced on 7 and 8 February 2024.

• The Gas Alert Micro 5 PID is calibrated and verified according to factory specifications prior to collecting the readings.

Sampling Location Total VOCs (µg/L)

2/1/24 2/8/24 2/15/24 2/29/24

Influent (INF) Not Sampled 201.67 Not Sampled Not Sampled

Bag Filter Effluent (BFE) 130 132 125.9 122.9

Resin Vessel C-1 42.3 56.46 63.12 Not Sampled

Resin Vessel C-2 Not Sampled Not Sampled Not Sampled 33.05

Resin Vessel C-3 30.6 38 41.8 36

Resin Vessel C-4 Not Sampled Not Sampled Not Sampled Not Sampled

Before Carbon Units (BCU) 14.07 24.88 29.6 13.4

After Primary Carbon Unit (ACU1) Not Sampled Not Sampled Not Sampled Not Sampled

After Secondary Carbon Unit (ACU2) Not Sampled 21.81 Not Sampled Not Sampled

Plant Effluent (EFF) Not Sampled 19.75 Not Sampled Not Sampled

Location PID (ppm)

2/2/24 2/9/24 2/16/24 2/23/24

Background 0 0 0 0

Vapor Collection Influent 2 0 0 0

Vapor Collection Intermediate 2 0 0 0

Vapor Collection Effluent 2 0 0 0

Month: March 2024

Reporting Period: 3/1/2024 – 3/31/2024

Cumulative Influent Flow: 1,194,191,735 gal

Cumulative Effluent Flow: 1,204,259,148 gal

The Canal Creek Groundwater Treatment Facility (GWTF) and the well field had runtimes of 84.2% for the month of March 2024. The year to date runtimes for the GWTF and the well field are 94.6% and 94.7%, respectively. The NPDES equivalency discharge criteria were met for the month. Due to a localized increase of groundwater VOC concentrations, extraction well EW-8 continued on a 30 days on and 30 days off schedule. EW-8 was disabled on 2/26/24 and is scheduled to be restarted in early April 2024.

March

Monthly Flow

(gal)

Total Flow

(2004-2024)

(gal)

EW-1 250,360 88,152,932

EW-2 0 18,413,853

EW-3 0 21,984,928

EW-4 766,927 260,201,181

EW-5 866,000 229,906,934

EW-6 820,000 228,091,290

EW-7 911,000 246,204,794

EW-8 2,409 101,235,823

Total 3,616,696 1,194,191,735

Note:

• In addition to EW-8, the active extraction system consisted of five extraction wells (EW-1, EW-4, EW-5, EW-6, and EW-7) during the month. Consistent operation of the five well extraction system provides adequate capture of the target total VOC 100 μg/L isocontour.

• The average monthly flow rate of the well field was 111 gallons per minute.

• Bag filter life ranged from 49 minutes to 8 days 10 hours 30 minutes and averaged 5 days 22 hours 39 minutes for the month.

Wells

Affected Reason for Shutdown

Date Time Date Time

3/21/24 10:49 3/26/24 8:42 117.88 All Wells Well field was disabled to acid wash the GWTF.

Reason for Shutdown/Recirculation Mode

Date Time Date Time

3/21/24 10:52 3/26/24 8:27 117.58 GWTF was placed in recirculation mode for acid washing.

03/01/24 Completed repairs to P-4A (resin system feed) pump.

03/04/24 Conducted quarterly water level survey.

03/06/24 Turned on composite sampler, Performed short duration backwashes of resin vessels.

03/07/24 Collect monthly NPDES equivalency samples.

03/10/24 Manually reset P-1A (system feed), P-1B (system feed), and P-4B (resin system feed) pump drives due to a power surge.

03/18/24 Performed short duration backwashes of resin vessels.

03/21/24 The plant was placed in recirculation mode and the acid wash was started. Beneficial Reuse System Contractor

(JCI) was notified of the scheduled shutdown.

03/22/24 Installed safety lanyard above floc chamber for fall protection.

03/25/24 Completed acid washing the plant.

03/27/24 Performed short duration backwashes of carbon units and resin vessels.

03/28/24 Completed monthly safety inspection.

Health and Safety: The following topics were discussed during the month: Daylight Savings Time, Managing Workplace

Stress, A Single Second, and Outdoor Safety Tips.

Process Chemical Deliveries: Subcontractor (Coyne Chemical) delivered 1 tote of sulfuric acid (3/14/24), Subcontractor

(Carmeuse) delivered 4,600 gallons of lime slurry (3/28/24).

Process Waste Disposals: None.

Results for the GWTF samples that were collected in March are provided below:

• Samples collected during the month indicated that the plant was compliant with all required discharge criteria. The treatment goal for effluent total VOCs is < 100 µg/L.

• The resin vessels are only sampled when in the primary position.

• Performance samples were not collected the third and fourth weeks of the month due to the need of a regeneration for resin vessels C-2 and C-3 (completed in April).

3/7/24 3/14/24

Influent (INF) 187.26 Not Sampled

Bag Filter Effluent (BFE) 127.7 126.67

Resin Vessel C-1 Not Sampled Not Sampled

Resin Vessel C-2 47.9 39.5

Resin Vessel C-3 46.78 39.58

Resin Vessel C-4 Not Sampled Not Sampled

Before Carbon Units (BCU) 25.47 22.06

After Primary Carbon Unit (ACU1) Not Sampled Not Sampled

After Secondary Carbon Unit (ACU2) 24.08 Not Sampled

Plant Effluent (EFF) 21.53 Not Sampled

• In accordance with the GWTF O&M manual, change out of the vapor carbon units is necessary when the intermediate PID readings (collected between the two carbon vessels) consistently approaches 67 percent of the influent concentration. The last vapor carbon changeout occurred during February 2024.

• The Gas Alert Micro 5 PID is calibrated and verified according to factory specifications prior to collecting the readings.

Location PID (ppm)

3/1/24 3/8/24 3/15/24 3/22/24 3/29/24

Background 0 0 0 0 0

Vapor Collection Influent 0 0 0 0 0

Vapor Collection Intermediate 0 0 0 0 0

Vapor Collection Effluent 0 0 0 0 0

Month: April 2024

Reporting Period: 4/1/2024 – 4/30/2024

Cumulative Influent Flow: 1,200,113,788 gal

Cumulative Effluent Flow: 1,210,150,148 gal

Both the Canal Creek Groundwater Treatment Facility (GWTF) and the well field had runtimes of 100% for the month of April 2024.

The year to date runtimes for the GWTF and the well field are both 96%. The NPDES equivalency discharge criteria were met for the month. Due to a localized increase of groundwater VOC concentrations, extraction well EW-8 continued on a 30 days on and 30 days off schedule. EW-8 ran from 4/1/24 through 4/29/24 and is scheduled to be restarted in late May/early June 2024.

April

Monthly Flow

(gal)

Total Flow

(2004-2024)

(gal)

EW-1 389,710 88,542,642

EW-2 0 18,413,853

EW-3 0 21,984,928

EW-4 1,149,216 261,350,397

EW-5 1,298,000 231,204,934

EW-6 1,205,000 229,296,290

EW-7 1,240,000 247,444,794

EW-8 640,127 101,875,950

Total 5,922,053 1,200,113,788

Note:

• In addition to EW-8, the active extraction system consisted of five extraction wells (EW-1, EW-4, EW-5, EW-6, and EW-7) during the month. Consistent operation of the five well extraction system provides adequate capture of the target total VOC 100 μg/L isocontour.

• The average monthly flow rate of the well field was 117 gallons per minute.

• Bag filter life ranged from 4 days 14 hours 47 minutes to 6 days 20 hours 45 minutes and averaged 6 days 2 hours 23

04/01/24 Performed short duration backwashes of resin vessels C-3 and C-4, Initiated regeneration of resin vessel C-2, Turned on extraction well EW-8, Completed monthly safety inspection.

04/02/24 Completed regeneration of resin vessel C-2, Replaced the C2-F valve actuator.

04/03/24 Initiated regeneration of resin vessel C-3.

04/04/24 Completed regeneration of resin vessel C-3.

04/08/24 Cleaned exterior of lime injection line.

04/09/24 Turned on the composite sampler, Cut grass surrounding the plant.

04/10/24 Collected monthly NPDES equivalency samples.

04/16/24 Cut grass around extraction well boxes and the plant.

04/17/24 Performed short duration backwashes of the carbon units and resin vessels.

04/18/24 Repaired the T-5 (lime day) tank eyewash station.

04/24/24 Initiated regeneration of resin vessel C-4.

04/25/24 Completed regeneration of resin vessel C-4.

04/29/24 Turned off EW-8, Performed short duration backwashes of resin vessels.

04/30/24 Cut grass around extraction well boxes.

Health and Safety: The following topics were discussed during the month: Portable Abrasive Wheel Safety, Take Action -

Prevent Distracted Driving, and Concrete Burns.

Process Chemical Deliveries: Subcontractor delivered 1 drum of ScalSolv (4/15/24).

Process Waste Disposals: Contractor (Veolia) picked up 5,200 gallons of sludge (4/3/24).

Results for the GWTF samples that were collected in April are provided below:

all required discharge criteria. The treatment goal for effluent total VOCs is < 100 µg/L.

• The resin vessels are only sampled when in the primary position.

• Performance samples were not collected the third and fourth weeks of the month due to the need of a regeneration for resin vessel C-4 (completed on 4/25/24).

• In accordance with the GWTF O&M manual, changeout of the vapor carbon units is necessary when the intermediate PID readings (collected between the two carbon vessels) consistently approaches 67 percent of the influent concentration or a changeout occurs every two years. The last vapor carbon changeout occurred during February 2024.

• The Gas Alert Micro 5 PID is calibrated and verified according to factory specifications prior to collecting the readings.

Sampling Location Total VOCs (µg/L)

4/4/24 4/10/24

Influent (INF) Not Sampled 179.8

Bag Filter Effluent (BFE) 140.07 134.8

Resin Vessel C-1 34.78 36.8

Resin Vessel C-2 Not Sampled Not Sampled

Resin Vessel C-3 Not Sampled Not Sampled

Resin Vessel C-4 43.15 44.7

Before Carbon Units (BCU) 4.13 6.3

After Primary Carbon Unit (ACU1) Not Sampled Not Sampled

After Secondary Carbon Unit (ACU2) Not Sampled 1.94

Plant Effluent (EFF) Not Sampled 1

Location PID (ppm)

4/5/24 4/12/24 4/19/24 4/26/24

Background 0 0 0 0

Vapor Collection Influent 0 0 0 0

Vapor Collection Intermediate 0 0 0 0

Vapor Collection Effluent 0 0 0 0

Month: May 2024

Reporting Period: 5/1/2024 – 5/31/2024

Cumulative Influent Flow: 1,204,390,300 gal

Cumulative Effluent Flow: 1,214,431,148 gal

Both the Canal Creek Groundwater Treatment Facility (GWTF) and the well field had runtimes of 100% for the month of May 2024. The year to date runtimes for the GWTF and the well field are both 96.8%. The NPDES equivalency discharge criteria were met for the month. Due to a localized increase of groundwater VOC concentrations, extraction well EW-8 continued on a 30 days on and 30 days off schedule. EW-8 was restarted on 5/28/24 and is scheduled to be disabled in late June 2024.

May

Monthly Flow

(gal)

Total Flow

(2004-2024)

(gal)

EW-1 312,630 88,855,272

EW-2 0 18,413,853

EW-3 0 21,984,928

EW-4 895,182 262,245,579

EW-5 1,054,000 232,258,934

EW-6 964,000 230,260,290

EW-7 967,000 248,411,794

EW-8 83,700 101,959,650

Total 4,276,512 1,204,390,300

Note:

• In addition to EW-8, the active extraction system consisted of five extraction wells (EW-1, EW-4, EW-5, EW-6, and EW-7) during the month. Consistent operation of the five well extraction system provides adequate capture of the target total VOC 100 μg/L isocontour.

• The average monthly flow rate of the well field was 108 gallons per minute.

• Bag filter life ranged from 7 days 19 hours 15 minutes to 10 days 9 hours 37 minutes and averaged 9 days 1 hour 38

05/06/24 Performed short duration backwashes of the resin vessels, Completed monthly safety inspection.

05/08/24 Reset P-1 (system feed) and P-4 (resin system feed) pump drives due to power surge, Turned on composite sampler.

05/09/24 Removed vegetation around the outside of the plant, Collected monthly NPDES equivalency samples.

05/13/14 Initiated regeneration of resin vessel C-1.

05/14/24 Completed regeneration of resin vessel C-1.

05/15/24 Subcontractor (Eastern Lift) performed preventative maintenance on fork truck.

05/17/24 Relocated P-4B drive display to the exterior of the panel.

05/20/24 Removed excess sludge from containment pit sump, Performed short duration backwashes of the resin vessels.

05/22/24 Cut grass surrounding plant.

05/23/24 Repaired ME-3A (sand filter) weir plate leaks.

05/28/24 Extraction well EW-8 was enabled, Performed short duration backwashes of resin vessels and carbon units.

05/30/24 Cut grass around extraction well boxes.

Health and Safety: The following topics were discussed during the month: Heat Stress, Driving Personal Ownership, Motorcycle Safety, and Lithium Ion Batteries.

Process Waste Disposals: Contractor (Veolia) picked up 19 spent vapor carbon drums and 2 spent bag filter drums

(5/22/24), Contractor (Veolia) picked up 5,784 gallons of sludge (5/29/24).

Results for the GWTF samples that were collected in May are provided below:

• Samples collected during the month indicated that the plant was compliant with all required discharge criteria.

The treatment goal for effluent total VOCs is < 100 µg/L.

• The resin vessels are only sampled when in the primary position.

• Performance samples were not collected the third week of the month due to the holiday.

• In accordance with the GWTF O&M manual, changeout of the vapor carbon units is necessary when the intermediate PID readings (collected between the two carbon vessels) consistently approaches 67 percent of the influent concentration or a changeout occurs every two years. The last vapor carbon changeout occurred during February 2024.

• The Gas Alert Micro 5 PID is calibrated and verified according to factory specifications prior to collecting the readings.

Sampling Location Total VOCs (µg/L)

5/2/24 5/9/24 5/16/24 5/30/24

Influent (INF) Not Sampled 192.47 Not Sampled Not Sampled

Bag Filter Effluent (BFE) 147.75 134.74 139.9 135.5

Resin Vessel C-1 57.35 56.71 Not Sampled Not Sampled

Resin Vessel C-2 Not Sampled Not Sampled 43.5 58.98

Resin Vessel C-3 31.31 30.2 36.8 45.31

Resin Vessel C-4 Not Sampled Not Sampled Not Sampled Not Sampled

Before Carbon Units (BCU) 21.31 22.8 14.43 30

After Primary Carbon Unit (ACU1) Not Sampled 21.71 Not Sampled Not Sampled

After Secondary Carbon Unit (ACU2) Not Sampled 5.44 Not Sampled Not Sampled

Plant Effluent (EFF) Not Sampled 5.83 Not Sampled Not Sampled

Location PID (ppm)

5/3/24 5/10/24 5/17/24 5/24/24 5/31/24

Background 0 0 0 0 0

Vapor Collection Influent 0 0 0 0 0

Month: June 2024

Reporting Period: 6/1/2024 – 6/30/2024

Cumulative Influent Flow: 1,208,826,661 gal

Cumulative Effluent Flow: 1,218,939,148 gal

Both the Canal Creek Groundwater Treatment Facility (GWTF) and the well field had runtimes of 99.3% for the month of June 2024.

The year to date runtimes for the GWTF and the well field are both 97.2%. The NPDES equivalency discharge criteria were met for the month. Due to a localized increase of groundwater VOC concentrations, extraction well EW-8 continued on a 30 days on and 30 days off schedule. EW-8 was disabled on 6/24/24 and is scheduled to be restarted in late July 2024.

June

Monthly Flow

(gal)

Total Flow

(2004-2024)

(gal)

EW-1 299,540 89,154,812

EW-2 0 18,413,853

EW-3 0 21,984,928

EW-4 843,049 263,088,628

EW-5 990,000 233,248,934

EW-6 844,000 231,104,290

EW-7 923,000 249,334,794

EW-8 536,772 102,496,422

Total 4,436,361 1,208,826,661

Note:

• In addition to EW-8, the active extraction system consisted of five extraction wells (EW-1, EW-4, EW-5, EW-6, and EW-7) during the month. Consistent operation of the five well extraction system provides adequate capture of the target total VOC 100 μg/L isocontour.

• The average monthly flow rate of the well field was 113 gallons per minute.

• Bag filter life ranged from 8 days 16 hours 50 minutes to 9 days 23 hours 43 minutes and averaged 9 days 6 hours 3

Wells

Affected Reason for Shutdown

Date Time Date Time

6/10/24 8:30 6/10/24 12:32 4.03 All Wells Well field was disabled to clear blockage in the T-2 tank gravity feed line.

6/19/24 10:37 6/19/24 11:37 1 All Wells Well field was disabled to repair the control valve for the beneficial reuse system.

Reason for Shutdown/Recirculation Mode

Date Time Date Time

6/10/24 8:30 6/10/24 12:32 4.03 GWTF was disabled to clear blockage in the T-2 tank gravity feed line.

6/19/24 10:37 6/19/24 11:37 1 GWTF was disabled to repair the control valve for the beneficial reuse system.

06/03/24 Performed short duration backwashes of resin vessels C-3 and C-4, Repaired extraction well EW-8 flow meter, Initiated regeneration of resin vessel C-2.

06/04/24 Completed regeneration of resin vessel C-2.

06/05/24 Turned on composite sampler.

06/06/24 Replaced P-4B (resin system feed) pump volute, Subcontractor (Fidelity) completed preventative maintenance on emergency generator, Collected monthly NPDES equivalency samples, Relocated P-1 (system feed) and P-4 pump drives display to panel exterior.

06/10/24 Cleared blockage in T-2 (lime reaction) tank gravity feed line.

06/11/24 Installed new flow meter for EW-8, Cleared containment pit of debris from T-2 tank gravity feed line.

06/12/24 Cut grass surrounding the plant.

06/13/24 Repaired MP-1 (sulfuric acid) pump.

06/17/24 Contractor (JCI) performed maintenance on beneficial reuse system (replaced pump and cleaned out the tank), Conducted quarterly water level survey.

06/18/24 Repaired downspouts located on the east side of the plant.

06/19/24 Subcontractor (Cummings Wagner) performed preventative maintenance on air compressors, Contractor (JCI) repaired control valve for the beneficial reuse system.

06/24/24 EW-8 was disabled.

06/25/24 Cleaned containment pit floor, Performed short duration backwashes of the resin vessels.

06/26/24 Completed monthly safety inspection.

Health and Safety: The following topics were discussed during the month: Bees, Wasps and Hornets, Three Points of

Contact, Jet Lag, and Prevent Tick Bites.

Process Chemical Deliveries: Subcontractor (Carmeuse) delivered 4,734 gallons of lime slurry (6/18/24).

Results for the GWTF samples that were collected in June are provided below:

• Samples collected during the month indicated that the plant was compliant with all required discharge

Criteria. The treatment goal for effluent total VOCs is < 100 µg/L.

• The resin vessels are only sampled when in the primary position.

• Performance samples were not collected the last week of the month due to the need for regenerations for resin vessels C-1 and C-3 (completed in July).

6/6/24 6/13/24 6/20/24

Influent (INF) 159.2 Not Sampled Not Sampled

Bag Filter Effluent (BFE) 109.68 118.4 114.05

Resin Vessel C-1 25.48 33 40.84

Resin Vessel C-2 Not Sampled Not Sampled Not Sampled

Resin Vessel C-3 36.42 38.77 39.69

Resin Vessel C-4 Not Sampled Not Sampled Not Sampled

Before Carbon Units (BCU) 12.16 17.73 22.89

After Primary Carbon Unit (ACU1) 18.87 Not Sampled Not Sampled

After Secondary Carbon Unit (ACU2) 9.47 Not Sampled Not Sampled

Plant Effluent (EFF) 8.63 Not Sampled Not Sampled intermediate PID readings (collected between the two carbon vessels) consistently approaches 67 percent of the influent concentration or a changeout occurs every two years. The last vapor carbon changeout occurred during February 2024.

• The Gas Alert Micro 5 PID is calibrated and verified according to factory specifications prior to collecting the readings.

Location PID (ppm)

6/7/24 6/14/24 6/21/24 6/28/24

Background 0 0 0 0

Vapor Collection Influent 0 0 0 0

Month: July 2024

Reporting Period: 7/1/2024 – 7/31/2024

Cumulative Influent Flow: 1,214,225,791 gal

Cumulative Effluent Flow: 1,224,438,148 gal

Both the Canal Creek Groundwater Treatment Facility (GWTF) and the well field had runtimes of 97.6% for the month of July 2024. The year to date runtimes for the GWTF and the well field are both 97.3%. The NPDES equivalency discharge criteria were met for the month. Due to a localized increase of groundwater VOC concentrations, extraction well EW-8 continued on a 30 days on and 30 days off schedule. EW-8 was restarted on 7/22/24 and is scheduled to be disabled in late August 2024.

July

Monthly Flow

(gal)

Total Flow

(2004-2024)

(gal)

EW-1 387,720 89,542,532

EW-2 0 18,413,853

EW-3 0 21,984,928

EW-4 1,059,115 264,147,743

EW-5 1,316,000 234,564,934

EW-6 1,087,000 232,191,290

EW-7 1,218,000 250,552,794

EW-8 331,295 102,827,717

Total 5,399,130 1,214,225,791

Note:

• In addition to EW-8, the active extraction system consisted of five extraction wells (EW-1, EW-4, EW-5, EW-6, and EW-7) during the month. Consistent operation of the five well extraction system provides adequate capture of the target total VOC 100 μg/L isocontour.

• The average monthly flow rate of the well field was 107 gallons per minute.

• Bag filter life ranged from 6 days 11 hours 28 minutes to 9 days 18 hours 45 minutes and averaged 7 days 19 hours 11

Wells

Affected Reason for Shutdown

Date Time Date Time

7/16/24 22:26 7/17/24 7:04 8.63 All Wells Well field was disabled due to a power outage caused by a storm.

7/19/24 12:58 7/19/24 15:39 2.68 All Wells Well field was disabled due to a basewide power outage.

7/28/24 23:49 7/29/24 6:31 6.7 All Wells

Well field was disabled due to a high level in the T-1

(equalization) tank caused by increased backwash flow.

Reason for Shutdown/Recirculation Mode

Date Time Date Time

7/16/24 22:26 7/17/24 7:04 8.63 GWTF was disabled due to a power outage caused by a storm.

7/19/24 12:58 7/19/24 15:39 2.68 GWTF was disabled due to a basewide power outage.

7/28/24 23:49 7/29/24 6:31 6.7 GWTF was disabled due to a high level in the T-1 (equalization) tank caused by increased backwash flow.

07/01/24 Initiated regeneration of resin vessel C-1, Completed monthly safety inspection.

07/02/24 Completed regeneration of resin vessel C-1, Repaired spare volute for P-4 (resin system feed) pumps.

07/08/24 Initiated regeneration of resin vessel C-3, Replaced the airline on the CV-10B (lime slurry transfer pump) valve.

07/09/24 Completed regeneration of resin vessel C-3, APG fire department conducted fire inspection.

07/10/24 Turned on composite sampler.

07/11/24 Collected monthly NPDES equivalency samples.

07/14/24 Reset plant sump pump.

07/15/24 Replaced sludge transfer pump fittings, Replaced sump pump float switches.

07/17/24 APG fire department onsite to check alarm notifier (Submitted DPW work order for repairs), Replaced relay for extraction well EW-1.

07/18/24 Replaced battery in plant AED, Cut grass surrounding the plant.

07/22/24 Turned on EW-8, Replaced belt in B-1A (vapor collection blower).

07/24/24 Performed short duration backwashes of the resin vessels and carbon units.

07/29/24 Replaced ME-3B (upflow sand filter) air lift pump, Repaired ME-3B air line.

07/30/24 Initiated regeneration of resin vessel C-4, Cut grass around extraction well boxes.

07/31/24 Completed regeneration of resin vessel C-4.

Health and Safety: The following topics were discussed during the month: Fourth of July Safety, Excavator Quick Coupler

Devices, Sun Safety, and Common Sense.

Process Chemical Deliveries: Subcontractor (Coyne Chemical) delivered 1 tote of sulfuric acid (7/11/24).

Process Waste Disposals: Contractor (Veolia) picked up 5,379 gallons of sludge (7/17/24).

Results for the GWTF samples that were collected in July are provided below:

7/11/24 7/18/24

Influent (INF) 184.72 Not Sampled

Bag Filter Effluent (BFE) 113.42 124.86

Resin Vessel C-1 Not Sampled 41.01

Resin Vessel C-2 33.99 Not Sampled

Resin Vessel C-3 Not Sampled Not Sampled

Resin Vessel C-4 40.64 64.61

Before Carbon Units (BCU) 6.07 16.61

After Primary Carbon Unit (ACU1) 20.62 Not Sampled

After Secondary Carbon Unit (ACU2) 16.6 Not Sampled

Plant Effluent (EFF) 14 Not Sampled

Sampling Activities (cont’d):

all required discharge criteria. The treatment goal for effluent total VOCs is < 100 µg/L.

• The resin vessels are only sampled when in the primary position.

• Performance samples were not collected the first week of the month due to the need for regenerations for resin vessels C-1 (completed on 7/2/24) and C-3 (completed on 7/9/24).

• Performance samples were not collected the last week of the month due to the need for a regeneration for resin vessel C-4 (completed on 7/31/24).

intermediate PID readings (collected between the two carbon vessels) consistently approaches 67 percent of the influent concentration or a changeout occurs every two years. The last vapor carbon changeout occurred during February 2024.

• The Gas Alert Micro 5 PID is calibrated and verified according to factory specifications prior to collecting the readings.

Location PID (ppm)

7/5/24 7/12/24 7/19/24 7/26/24

Background 0 0 0 0

Vapor Collection Influent 0 0 0 0

Month: August 2024

Reporting Period: 8/1/2024 – 8/31/2024

Cumulative Influent Flow: 1,218,621,374 gal

Cumulative Effluent Flow: 1,228,957,148 gal

Both the Canal Creek Groundwater Treatment Facility (GWTF) and the well field had runtimes of 98.5% for the month of August 2024.

The year to date runtimes for the GWTF and the well field are both 97.7%. The NPDES equivalency discharge criteria were met for the month. Due to a localized increase of groundwater VOC concentrations, extraction well EW-8 continued on a 30 days on and 30 days off schedule. EW-8 was disabled on 8/19/24 and is scheduled to be restarted in September 2024.

August

Monthly Flow

(gal)

Total Flow

(2004-2024)

(gal)

EW-1 308,020 89,850,552

EW-2 0 18,413,853

EW-3 0 21,984,928

EW-4 806,027 264,953,770

EW-5 1,029,000 235,593,934

EW-6 860,000 233,051,290

EW-7 991,000 251,543,794

EW-8 401,536 103,229,253

Total 4,395,583 1,218,621,374

Note:

• In addition to EW-8, the active extraction system consisted of five extraction wells (EW-1, EW-4, EW-5, EW-6, and EW-7) during the month. Consistent operation of the five well extraction system provides adequate capture of the target total VOC 100 μg/L isocontour.

• The average monthly flow rate of the well field was 115 gallons per minute.

• Bag filter life ranged from 6 days 1 hour 12 minutes to 7 days 13 hours 59 minutes and averaged 6 days 20 hours 34

Wells

Affected Reason for Shutdown

Date Time Date Time

8/12/24 7:55 8/12/24 10:30 2.58 All Wells Well field was disabled to clean the T-2 (lime reaction) tank gravity feed line.

8/18/24 23:09 8/19/24 7:37 8.47 All Wells Well field was disabled due to tripped power supply caused by storm activity.

2) Plant:

Reason for Shutdown/Recirculation Mode

Date Time Date Time

8/12/24 8:05 8/12/24 10:33 2.47 GWTF was disabled to clean the T-2 (lime reaction) tank gravity feed line.

8/18/24 23:20 8/19/24 8:00 8.67 GWTF was disabled due to the well field tripped power supply caused by storm activity.

08/01/24 Completed the monthly safety inspection.

08/02/24 Replaced the lime injection solenoid air line.

08/05/24 Contractor (JCI) replaced actuator on beneficial reuse system.

08/06/24 APG Fire Department submitted work order to repair plant alarm notifier, Disabled B-2 blower due to overheating.

08/07/24 Performed short duration backwashes of the resin vessels, Replaced bearing in B-2 blower motor.

08/12/24 Cleaned T-2 (lime reaction) tank gravity feed line, Cleaned the containment pit.

08/13/24 Initiated regeneration of resin vessel C-2, Replaced shaker under floc chamber, Unclogged basement floor drains.

08/14/24 Completed regeneration of resin vessel C-2, Turned on composite sampler.

08/15/24 Collected monthly NPDES equivalency samples.

08/19/24 Reset well field power supply, Extraction well EW-8 was disabled, Contractor (Kinetix) onsite to repair plant fire alarm (part is needed to replace heat sensors), Repaired liquid and vapor carbon vessel pressure gauges.

08/20/24 Installed 1” potable water line in containment pit, Contractor (Kinetix) replaced heat sensors in basement.

08/21/24 Cleared lime injection line, Contractor (Kinetix) conducted annual fire alarm test.

08/22/24 Installed brace under T-2 tank gravity feed line.

08/26/24 Cut grass around extraction well boxes.

08/27/24 Subcontractor (Keystone) performed annual crane inspection.

08/29/24 Performed short duration backwashes of the resin vessels, Replaced shaker under the floc chamber. Subcontractor

(Cummings Wagner) completed repairs to air compressors.

08/30/24 DPW personnel completed Hazmat inspection.

Health and Safety: The following topics were discussed during the month: Vehicle Theft, Insect Activity, Back to School

Safety, and Clothing and Safety.

Process Chemical Deliveries: Subcontractor (Carmeuse) delivered 4,600 gallons of lime slurry (8/23/24).

Process Waste Disposals: Contractor picked up 5,209 gallons of sludge (8/28/24).

Results for the GWTF samples that were collected in August are provided below:

• Samples collected during the month indicated that the plant was compliant with all required discharge criteria.

The treatment goal for effluent total VOCs is < 100 µg/L.

• The resin vessels are only sampled when in the primary position.

• The monthly NPDES samples were collected the second week of the month, however due to a FEDEX delay the samples were out of temperature when the cooler arrived at the laboratory. The monthly NPDES samples were recollected on 8/15/24.

8/1/24 8/15/24 8/22/24 8/29/24

Influent (INF) Not Sampled 204.76 Not Sampled Not Sampled

Bag Filter Effluent (BFE) 127.76 153.14 148.19 154.78

Resin Vessel C-1 Not Sampled 39.32 46.73 66.61

Resin Vessel C-2 52.22 Not Sampled Not Sampled Not Sampled

Resin Vessel C-3 23.18 37.6 35.3 47.48

Resin Vessel C-4 Not Sampled Not Sampled Not Sampled Not Sampled

Before Carbon Units (BCU) 15.44 9.44 17.5 27.03

After Primary Carbon Unit (ACU1) Not Sampled 22.79 Not Sampled Not Sampled

After Secondary Carbon Unit (ACU2) Not Sampled 21.87 Not Sampled Not Sampled

Plant Effluent (EFF) Not Sampled 19.08 Not Sampled Not Sampled

• In accordance with the GWTF O&M manual, changeout of the vapor carbon units is necessary when the intermediate PID readings (collected between the two carbon vessels) consistently approaches 67 percent of the influent concentration or a changeout occurs every two years. The last vapor carbon changeout occurred during February 2024.

• The Gas Alert Micro 5 PID is calibrated and verified according to factory specifications prior to collecting the readings.

Location PID (ppm)

8/2/24 8/9/24 8/16/24 8/23/24 8/30/24

Background 0 0 0 0 0

Vapor Collection Influent 0 0 1 0 0

Month: September 2024

Reporting Period: 9/1/2024 – 9/30/2024

Cumulative Influent Flow: 1,222,709,186 gal

Cumulative Effluent Flow: 1,233,169,148 gal

Both the Canal Creek Groundwater Treatment Facility (GWTF) and the well field had runtimes of 100% for the month of September

2024. The year to date runtimes for the GWTF and the well field are both 97.7%. The NPDES equivalency discharge criteria were met for the month. Due to a localized increase of groundwater VOC concentrations, extraction well EW-8 continued on a 30 days on and 30 days off schedule. EW-8 was restarted on 9/23/24 and is scheduled to be disabled in October 2024.

September

Monthly Flow

(gal)

Total Flow

(2004-2024)

(gal)

EW-1 282,485 90,133,037

EW-2 0 18,413,853

EW-3 0 21,984,928

EW-4 695,048 265,648,818

EW-5 1,058,000 236,651,934

EW-6 888,000 233,939,290

EW-7 1,066,000 252,609,794

EW-8 98,279 103,327,532

Total 4,087,812 1,222,709,186

Note:

• In addition to EW-8, the active extraction system consisted of five extraction wells (EW-1, EW-4, EW-5, EW-6, and EW-7) during the month. Consistent operation of the five well extraction system provides adequate capture of the target total VOC 100 μg/L isocontour.

• The average monthly flow rate of the well field was 106 gallons per minute.

• Bag filter life ranged from 5 days 10 hours 6 minutes to 6 days 19 hours 28 minutes and averaged 6 days 11 hours 56

Wells

Affected Reason for Shutdown

Date Time Date Time

9/24/24 10:40 9/27/24 9:04 70.4 EW-4

Extraction well EW-4 was disabled due to a power failure.

9/24/24 10:40 10/2/24 13:55 195.25 EW-1

Extraction well EW-1 was disabled due to a power failure and to replace the motor.

2) Plant: The GWTF was 100 percent operational for the month.

09/03/24 Cut grass around GWTF.

09/04/24 Turned on composite sampler.

09/05/24 Collected monthly NPDES equivalency samples.

09/09/24 Initiated regeneration of resin vessel C-1.

09/10/24 Completed regeneration of resin vessel C-1.

09/12/24 Began installation of secondary acid injection - to be used to condition virgin liquid phase carbon, Ran conduit from containment pit to the carbon units.

09/16/24 Attempted to enable extraction well EW-8 - a fuse blew and the pump was disabled (ordered replacement fuses), Performed short duration backwashes of carbon units.

09/17/24 Subcontractor (Fireline) conducted annual fire extinguisher inspection, Pulled EW-8 suction line and removed the motor, Completed monthly safety inspection.

09/18/24 Assembled static mixer and pH probe for carbon unit for secondary acid injection.

09/19/24 Performed short duration backwashes of the resin vessels.

09/23/24 Conducted quarterly water level survey, Completed installation of new motor for EW-8, EW-8 was enabled.

09/24/24 Performed short duration backwashes of the resin vessels, EW-1 and EW-4 were disabled due to a power failure, Contractor (City, Light, and Power) inspected EW-1 – determined no voltage issues at junction boxes.

09/25/24 Contacted DPW regarding power loss to EW-1 and EW-4.

09/26/24 Cleaned lime injection line.

09/27/24 Enabled EW-4.

09/30/24 Tested EW-3 for upcoming LTM sampling event.

Health and Safety: The following topics were discussed during the month: Are You Read for a Disaster?, Cold and Flu

Season, Ring Testing Abrasive Grinder Wheels, and Preventing Car Accidents.

Results for the GWTF samples that were collected in September are provided below:

• Samples collected during the month indicated that the plant was compliant with all required discharge criteria. The treatment goal for effluent total VOCs is < 100 µg/L.

• The resin vessels are only sampled when in the primary position.

• Performance samples were not collected the second week of the month due to the need for a regeneration of resin vessel C-1 (completed on 9/10/24).

• The BFE from 9/26/24 were lower than normal due to extraction wells EW-1 and EW-4 being offline at the time of sample collection.

9/5/24 9/19/24 9/26/24

Influent (INF) 232.25 Not Sampled Not Sampled

Bag Filter Effluent (BFE) 154.66 113.6 71.11

Resin Vessel C-1 61.44 Not Sampled Not Sampled

Resin Vessel C-2 Not Sampled 46.03 20.62

Resin Vessel C-3 42.73 40.74 29.97

Resin Vessel C-4 Not Sampled Not Sampled Not Sampled

Before Carbon Units (BCU) 29.43 16.68 35.08

After Primary Carbon Unit (ACU1) 27.59 Not Sampled Not Sampled

After Secondary Carbon Unit (ACU2) 25.35 Not Sampled Not Sampled

Plant Effluent (EFF) 23.42 Not Sampled Not Sampled intermediate PID readings (collected between the two carbon vessels) consistently approaches 67 percent of the influent concentration or a changeout occurs every two years. The last vapor carbon changeout occurred during February 2024.

• The Gas Alert Micro 5 PID is calibrated and verified according to factory specifications prior to collecting the readings.

Location PID (ppm)

9/6/24 9/13/24 9/20/24 9/27/24

Background 0 0 0 0

Vapor Collection Influent 0 0 0 0

Month: October 2024

Reporting Period: 10/1/2024 – 10/31/2024

Cumulative Influent Flow: 1,228,300,086 gal

Cumulative Effluent Flow: 1,238,915,148 gal

Both the Canal Creek Groundwater Treatment Facility (GWTF) and the well field had runtimes of 100% for the month of October 2024.

The year to date runtimes for the GWTF and the well field are 97.9% and 98%, respectively. The NPDES equivalency discharge criteria were met for the month. Due to a localized increase of groundwater VOC concentrations, extraction well EW-8 continued on a 30 days on and 30 days off schedule. EW-8 was disabled on 10/21/24 and is scheduled to be restarted in November 2024.

October

Monthly Flow

(gal)

Total Flow

(2004-2024)

(gal)

EW-1 319,965 90,453,002

EW-2 8,938 18,422,791

EW-3 11,821 21,996,749

EW-4 1,105,756 266,754,574

EW-5 1,295,000 237,946,934

EW-6 1,083,000 235,022,290

EW-7 1,193,000 253,802,794

EW-8 573,420 103,900,952

Total 5,590,900 1,228,300,086

Note:

• In addition to EW-8, the active extraction system consisted of five extraction wells (EW-1, EW-4, EW-5, EW-6, and EW-7) during the month. Consistent operation of the five well extraction system provides adequate capture of the target total VOC 100 μg/L isocontour.

• Total flow increased for the two inactive extraction wells EW-2 and

EW-3 due to temporary activation for the LTM sampling event.

• The average monthly flow rate of the well field was 110 gallons per minute.

• Bag filter life ranged from 5 days 23 hours 49 minutes to 8 days 9 hours 2 minutes and averaged 6 days 23 hours 37

Wells

Affected Reason for Shutdown

Date Time Date Time

9/24/24 10:40 10/2/24 13:55 195.25 EW-1

Extraction well EW-1 was disabled due to a power failure and to replace the motor and pump.

10/01/24 Fabricated replacement section of the lime injection manifold.

10/02/24 Installed new pump and motor for extraction well EW-1.

10/03/24 Installed replacement section of the lime injection manifold.

10/06/24 Received Scada alarm due to high T-2 (lime reaction) tank pH probe reading – cleaned and calibrated the T-2 pH probe and inspected the T-2, T-10 (lime storage), and T-5 (lime day) tank mixers, P-2A (lime recirculation) pump,…