W912DR18R0055_-_Attachment_AU_-_DRAFT_-_BDGR_OM_Manual_1.pdf

DRAFT

OPERABLE UNIT 8 BIO-ENHANCED DIRECTED

GROUNDWATER RECIRLULATION OPERATIONS AND

MAINTENANCE MANUAL

FOR

DEFENSE SUPPLY CENTER RICHMOND

RICHMOND, VIRGINIA

Prepared For

Defense Logistics Agency

And

Defense Supply Center Richmond

May 2018

DRAFT

OPERABLE UNIT 8 BIO-ENHANCED DIRECTED GROUNDWATER

RECIRCULATION OPERATIONS AND MAINTENANCE MANUAL

FOR

DEFENSE SUPPLY CENTER RICHMOND

RICHMOND, VIRGINIA

Prepared For:

Defense Logistics Agency

DLA Installation Operations

Created By:

Arcadis, U.S., Inc.

Contract No. W912DR-13-D0019 Delivery Order 0005

Operational Unit 8 Bio-enhanced Directed Groundwater Recirculation Operations and Maintenance Manual arcadis.com O&M Manual for the OU8 BDGR System

OPERATIONAL UNIT 8

BIO-ENHANCED

DIRECTED

GROUNDWATER

RECIRCULATION

OPERATION AND

MAINTENANCE

MANUAL

Prepared for:

United States Army Corp of Engineers

Baltimore District

Prepared by:

Arcadis U.S., Inc.

9954 Mayland Drive

Suite 2400

Richmond

Virginia 23233

Tel 804 740 0181

Fax 804 217 8292

Our Ref.:

02118201.0001

Date:

This document is intended only for the use of the individual or entity for which it was prepared and may contain information that is privileged, confidential and exempt from disclosure under applicable law. Any dissemination, distribution or copying of this document is strictly prohibited.

Justin Coffey Environmental Scientist

Chris Spooner Remediation Technical Lead

Courtney Ingersoll, PMP Project Manager arcadis.com i

CONTENTS

Acronyms and Abbreviations ........................................................................................................................ iii

1 Introduction

2 System Overview

2.1 System Configuration

2.1.1 Operational Settings

3 Equipment Description

3.1 Extraction Well Pumps (EX-0X)

3.2 Influent Equalization Tank (T-101)

3.3 Influent Transfer Pump (P-101)

3.4 Bag Filters (BF-101 and BF-201)

3.5 Liquid Granular Activated Carbon (GAC-102A and GAC-102B)

3.6 Injection Equalization Tank (T-201)

3.7 Transfer Pump (P-201)

3.8 Chemical Metering Pump (P-110, P-210, and P-211)

4 System electrical, Controls, and instrumentation

4.1 Electrical Power Distribution

4.2 System User Interface

4.3 System Operation

4.4 Remote Connection Procedure

4.5 Data History Trends, Data Logging Storage files and Collection

4.6 Alarms, Email Notification and Auto-Dialer Paging

4.7 List of Alarms:

4.8 Telemetry Unit

5 System Operation Limits

5.1 BDGR System

6 System Operation Details

6.1 System Startup after Extended Deactivation

6.2 System Start Up After an Alarm Condition Shutdown

6.3 System Shutdown for Routine Maintenance

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6.4 Extended System Shutdown

6.5 Emergency System Shutdown

7 System Operation Details

8 Equipment Maintenance

8.1 LPA Hydraulic Containment System Mechanical Equipment

8.1.1 Bag Filters (BF-101A/B and BF-201A/B)

8.1.2 LGAC Vessels (LGAC)

8.1.3 Heater

8.1.4 Fan

8.1.5 pH Transmitter (AI-301B)

8.1.6 Pumps

8.1.7 Flow Meters

8.1.8 Level Switches

8.1.9 Pressure Transducers

9 Equipment Maintenance

APPENDICES

Appendix A System Drawings

Appendix B Equipment Specifications Cut Sheets and O&M Manuals

Appendix C HMI Standard Operating Procedure

Appendix D Initial Start-up Procedure

Appendix E Lockout/Tagout Procedure arcadis.com iii

ACRONYMS AND ABBREVIATIONS

Amp Amperes

BDGR bio-enhanced directed groundwater recirculation

BF bag filter cis-1,2-DCE cis-1,2-dichloroethene

COC compounds of concern

DLA Defense Logistics Agency

E-STOP Emergency Stop ft feet/foot gpm gallons per minute

HMI Human Machine Interface

HP horse power

KVA kilovolt Amperes

LGAC liquid phase granular activated carbon

MCE Motor Control Enclosure

MCP Main Control Panel

O&M operations and maintenance

OU operable unit

PCE tetrachloroethene

PLC programmable logic controller

PSI pounds per square inch

TCE trichloroethene

U.S. United States

USACE United States Army Corp of Engineers

V volt

VAC volts alternating current

VFD variable frequency drive

VOC volatile organic compound arcadis.com

1 INTRODUCTION

Arcadis U.S., Inc. has prepared this Operable Unit (OU) 8 Bio-enhanced Directed Groundwater Recirculation System Operation and Maintenance Manual (BDGR O&M Manual) to meet the requirements of the scope of work dated 22 June 2015 issued by the United States (U.S.) Army Corps of Engineers (USACE) Baltimore District, and all amendments and question and answer sets under the Architect/Engineer Indefinite Delivery Indefinite Quantity for Hazardous, Toxic, and Radioactive Waste and Military Munitions contract, Award No. W912DR-13-D-0019, Delivery Order 0005, awarded 25 September 2015. This BDGR O&M Manual documents the system requirements and procedures for O&M of the BDGR System located in OU 8 at Defense Supply Center Richmond. This BDGR O&M Manual also specifies the field documentation and quality assurance/quality control requirements for the performance monitoring program.

The BDGR treatment system is comprised of one building for water treatment and re-injection. The system was constructed to operate year-round and is designed to treat groundwater impacted with volatile organic compounds (VOCs) primarily tetrachloroethene (PCE), trichloroethene (TCE) and cis-1,2-dichloroethene (cis-1,2-DCE). The primary objectives of the BDGR system operation are as follows:

Sustain anaerobic and reducing geochemical conditions in groundwater within and immediately downgradient of the acid neutralization pits, Bay F of Warehouse 65, and portions of the pallet storage area;

Maintain hydraulic control of the targeted dissolved phase plume, thereby preventing further migration of the dissolved phase compounds of concern (COCs) along the targeted plume periphery;

Evaluate the effectiveness of BDGR for degradation of COCs and decreasing dissolved phase VOC concentrations.

2 SYSTEM OVERVIEW

2.1 System Configuration

The BDGR system includes a network of three recovery wells installed in the chlorinated solvent impacted upper water bearing unit in OU 8. Groundwater is extracted from the wells with electric submersible pumps controlled by diaphragm valves, which are manually adjusted to control flow from the well or a level in the extraction well. Extracted groundwater is pumped from the wells to an influent equalization tank to store water prior to being treated, and reinjected. The treatment system components are housed in one conex-style building located near the intersection of C Road and 4th Street on the central portion of the installation. Groundwater piping and electrical conduit to the extraction wells is installed below grade.

The layout of the BDGR system is illustrated in Appendix A. All treated effluent water from the system is injected into five injection wells, one located west of Building 65, and four located along the northern most wall of E Bay inside Building 65. Extracted water can also be discharged to a storm sewer located on the corner of C Road and 4th Street if discharge criteria are met. The BDGR effluent treatment requirements are listed in the table below.

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Effluent Parameter1 Sampling

Frequency

USEPA MCL

(µg/L)2

VPDES Permit Effluent

Instantaneous

Maximum Limitations

(µg/L)3

Chloroform Monthly 80 80.0

1,1 Dichloroethane Monthly -- 2.4

1,2 Dichloroethane Monthly 5 3.8

1,1, Dichloroethene Monthly 7 7.0 cis-1,2 Dichloroethene Monthly 70 70.0 trans-1,2 Dichloroethene Monthly 100 100.0

Methylene Chloride Monthly 5 5.0

Tetrachloroethene Monthly 5 5.0

1,1,1 Trichloroethane Monthly 200 54.0

1,1,2 Trichloroethane Monthly 5 5.0

Trichloroethene Monthly 5 5.0

Vinyl Chloride Monthly 2 2.0

Carbon Tetrachloride Monthly 5 2.3

1,2 Dichlorobenzene Monthly 600 15.8

Chlorobenzene Monthly 100 3.4

Trichlorofluoromethane Monthly -- 5.0

Chloromethane Monthly -- 3.6 pH Monthly -- 6.0-9.0 1Compound will be analyzed using appropriate method from U.S. Environmental Protection Agency (USEPA) SW-

2Target treatment requirements for injected groundwater. Not required for injection.

3Only applicable to stormwater discharge if needed.

µg/L – micrograms per liter

MCL – maximum contaminant level arcadis.com

2.1.1 Operational Settings

The BDGR system treatment components have a maximum operating rate of approximately 45 gallons per minute (gpm). The current estimated maximum groundwater recovery rate for the system with all three extraction wells operating is approximately eight gpm.

The BDGR system has an operational run time goal of 95 percent; however, the expectation for the system is that it will run 100 percent of the time (not counting scheduled downtime for regular maintenance activities).

3 EQUIPMENT DESCRIPTION

The following section provides specifications for equipment utilized in the BDGR System. System piping, instrumentation diagrams, and treatment processes are provided in Appendix A. Cut sheets and equipment manuals for all the major treatment system components are provided in Appendix B.

3.1 Extraction Well Pumps (EX-0X)

The extraction well pumps are Grundfos RediFlo-4 pumps with Franklin ½ horse power (HP) motors. The pumps are supplied with 480 volts (V), three-phase power. Each extraction pump can provide between

0.5 to 5 gpm of flow to the system through a diaphragm valve manufactured by Spears and is monitored by a Seametrics MJ Series Pulse Meter.

3.2 Influent Equalization Tank (T-101)

Equalization Tank T-101 is a Snyder Industries, Inc. 550-gallon storage tank with a flanged connection on the top of the tank for loading and a flanged connection on the bottom sidewall of the tank for removing groundwater from the tank via a transfer pump. The tank has a diameter of 48 inches, and a height of 74 inches. The tank is equipped with connection ports for two Geotech Level Control Probe level switches and a Geotech level transducer.

3.3 Influent Transfer Pump (P-101)

Transfer pump P-101 is a 3HP, KM Series, Sundyne ANSIMAG, process pump. The pump is powered by a 480-V, three phase, 5-HP variable frequency drive (VFD)-rated motor.

3.4 Bag Filters (BF-101 and BF-201)

There are four stainless steel bag filter (BF) housings manufactured by Rosedale Products, Inc., Model

NLCO. The four BF housings are each lined with a stainless-steel screen and five-micron bag filters.

Pressure transmitters measure the BFs inlet and outlet pressures. The differential pressure over the BFs are calculated and monitored by the control system.

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3.5 Liquid Phase Granular Activated Carbon (LGAC-102A and LGAC- 102B)

Liquid phase granular activated carbon (LGAC) vessels manufactured by Tetrasolv modeled HPAF-2000.

Each pair of vessels operates in lead lag operation. The vessels are design for a flow rate of 100 gpm and 7 pounds per square inch (PSI) pressure loss through the vessels. The max pressure rating on each vessel is 75 PSI. The outside doors provide direct access to the top of the vessels and the opening for installation/changeout of media. Pressure transmitters measure the LGAC inlet and outlet pressures. The differential pressure over the LGAC vessels is calculated and monitored by the control system.

3.6 Injection Equalization Tank (T-201)

Equalization Tank T-201 is a Snyder Industries, Inc. 550-gallon storage tank with a flanged connection on the top of the tank for loading and a flanged connection on the bottom sidewall of the tank for removing groundwater from the tank via a transfer pump. The tank has a diameter of 48 inches, and a height of 74 inches. The tank is equipped with connection ports for two level switches and a level transducer. pH can be amended through a flanged connection on the top of the tank for loading.

3.7 Transfer Pump (P-201)

Transfer pump P-201 is a 3HP, KM Series, Sundyne ANSIMAG, process pump. The pump is powered by a 480-V, three phase, 5-HP VFD-rated motor.

3.8 Chemical Metering Pump (P-110, P-210, and P-211)

P-110 is a chemical metering pump that doses a chemical to adjust the pH in T-201. P-210 is a chemical metering pump that doses carbon via a 300-gallon tote directly into the injection wells. P-211 is a chemical metering pump that doses Biocide directly into the injection wells. P-100, P-210, and P-211 are

Pulsafeeder, Chem-Tech Series XPV pumps which doses at a maximum rate of 8 gallons per hour. The pumps include a 4-function valve and a digital interface. The pumps operate at 120 V.

4 SYSTEM ELECTRICAL, CONTROLS, AND

INSTRUMENTATION

4.1 Electrical Power Distribution

The main power supply to the BDGR system is 480/277 volts alternating current (VAC), three-phase, 60 Hertz, 200 Amperes (Amp) power. A 200 Amp fused main disconnect is mounted on the outside of the treatment system container. The fused disconnect feeds a main panelboard (PB-1). A 50 Amp breaker inside PB-1 feeds the Motor Control Enclosure / Main Control Panel (MCE/MCP). The MCE/MCP is a double-door enclosure with a barrier plate separating the MCP side from the MCE side (480VAC). A 15 Amp breaker in the MCE side feeds a 750 VA 480-240/120 transformer which is also located in the MCE side to power the MCP side of the enclosure. The MCP side of the enclosure only contains 120VAC and arcadis.com

24 volts direct current. PB-1 also provides power for a 15 kilovolt amperes (KVA) 480-240/120 V transformer and heater. The 15 KVA transformer feeds the 240/120 VAC panelboard (PB-2), which provides circuits including the building lights, receptacles, exhaust fan and heat trace controller.

Power distribution/single line diagram drawings are provided in Appendix A.

4.2 System User Interface

The MCE/MCP panel is in the treatment enclosure. The MCP has a ten-inch touch screen Human Machine Interface (HMI) and other user control switches including an Emergency Stop (E-STOP) switch, Hand Off Auto switches, alarm reset, and E-STOP reset buttons. The system has a wireless/cellular internet modem, and is provided with an unrestricted static internet provider address to allow remote access to the HMI. Additionally, the cellular internet modem provides internet access for alarm notifications, system status, and data reporting.

The system components, motors, and all equipment are controlled by an Allen-Bradley Compactlogix L33ER programmable logic controller (PLC). System data including equipment run-times (total hours), flow rates (gpm), and flow totals are displayed on the HMI and recorded on an external Universal Serial Bus (USB) flash drive.

Instructions on operating the HMI are included in Appendix C

4.3 System Operation

The BDGR system is designed to treat groundwater with a series of treatment processes prior to injecting it back into the ground. The water is first filtered with 5-micron BFs to remove any solids in the water.

Secondly, the water is treated with LGAC and after the groundwater is treated with carbon can be pumped to either injection wells or a surface water discharge. If the injection wells are not able to accept all the groundwater pumped from the extraction wells then the water is treated with a pH adjustment and pumped to a designated surface water discharge point at the corner of C Road and 4th Street.

Groundwater is extracted from three wells via electric submersible pumps (EX-0X) and stored in influent tank T-101. Water flow from the extraction well pumps is controlled by individual diaphragm valves and are designed to be manually adjusted to achieve desired flow rates or extraction well drawdown. Flow totalizers on each extraction well will provide a flow pulse to the PLC and that pulse will be interpreted into a flow rate. All extraction well pumps are disabled as a result of a critical alarm at the BDGR system, such as a low-level alarm or a high-level alarm in one of the equalization tanks or in the building sump.

Water is transferred from the influent tank T-101 via influent tank transfer pump P-101 to the BFs. Pump P-101 is programmed to turn off and on based on the T-101 water level setpoint. The pumping speed is controlled by a VFD. The VFD adjusts the pumping speed to maintain the water level setpoint in tank T- 101, as measured by the tank level transmitter. For example, P-101 will turn “ON” when the water level in the tank is 2.9 feet (ft) and the VFD for this pump will speed up and slow down to hold a water level of 3.1 ft in the tank. P-101 will shut “OFF” if the water level in the tank drops below 1.5 ft. All setpoint values can be adjusted.

Tank T-101 is equipped with a high-high level switch (LSHH-102, set at 4.2 ft). LSHH-102 is a critical alarm device initiating alarm LAHH-102. Alarm LAHH-102 will disable all extraction well pumps (P-arcadis.com

001/002/003). The low-low level switch (LSLL-101) (set at 0.5 ft) is a critical alarm device initiating alarm low-low level (LALL-101). Alarm LALL-101 will disable all extraction well pumps and transfer pump P-101.

The level transmitter has similar set-points for high-high level (transmitter) and low-low level (transmitter).

High-high level (transmitter) and low-low Level (transmitter) are critical alarms and the system will not turn back on until the alarm is cleared by the BDGR operator. In addition, P-101 VFD fault (YA-101) is a critical alarm and it will disable the extraction well pumps and P-101.

The BDGR building is equipped with a leak detection switch LSH-401. If LSH-401 is activated initiating critical alarm LAH-401, all the extraction well pumps will be disabled, and the system will go into “OFF” mode. LAH-401 is a critical alarm and the system will not turn back on until the alarm is cleared by the BDGR operator.

Groundwater is transferred from T-101 via P-101 to the BFs. Downstream of P-101 are two pressure transmitters (PT-101) and (PT-102) and a flow transmitter (FQIT-101) which relays instantaneous pressure and flow readings to the control system. Critical alarms generated from these instruments include the following:

1. High BF influent pressure alarm (PAH-101)

2. High LGAC vessel influent pressure alarm (PAH-102).

3. High-high BF differential pressure (DPAHH-101)

4. High-high LGAC vessel differential pressure (DPAHH-102)

PAH-101, PAH-102, DPAHH-101 and DPAHH-102 are critical alarms and the system will not turn back on until the alarm is cleared by the BDGR operator.

The BFs will remove solids from the groundwater prior to being pumped to the LGAC vessels. The Rosedale 5-micron BFs will need to be replaced by the BDGR operator when the differential pressure transmitter (DPI-101) has exceeded 15 PSI, or after a specified number of operating hours. Downstream from the BFs a pressure transmitter (PT-102) has been installed to provide instantaneous pressure readings. PT-101 and 102 are being used to calculate a differential pressure DPI-101 reading across the BFs. If the differential pressure reading goes above a BF-101A/B High Differential Pressure alarm (DPIT-

101) then an alarm is initiated. If the BF-101A/B High-High Differential Pressure critical alarm (DPIT-101) is triggered than the entire system will shut “OFF”. The BDGR system will not turn back on until the operator clears the critical alarm.

Once the groundwater has been filtered by the BFs it moves to be treated by the two LGAC vessels. The carbon vessels are piped so the groundwater is treated by two carbon vessels. The carbon vessels are set-up in a lead/lag configuration. PT-102 and 103 are being used to calculate a differential pressure reading across the LGAC vessels. If the differential pressure reading goes above a high differential pressure alarm (DPI-102) then a general alarm is initiated. If the high-high differential pressure critical alarm (DPIT-102) is triggered than the entire system will shut “OFF”. The BDGR system will not turn back on until the critical alarm is cleared by the operator.

From the LGAC vessels the water flows to Effluent Tank T-201. Water is transferred from the T-201 via effluent tank transfer pump P-201 to the injection wells. Pump P-201 will turn off and on based on T-201 water level setpoints. The pumping speed is controlled by a VFD. The VFD adjusts the pumping speed to maintain an operator setpoint water level in tank T-201, as measured by the tank level transmitter. The arcadis.com on/off and speed adjustment controls are identical to P-101. Tank T-201 is equipped with a high-high level switch (LSHH-202) and a low-low level switch (LSL-201). The high-high level switch LSHH-202 (set at 4.2 ft) is a critical alarm device initiating alarm LAHH-202 and it will disable all extraction well pumps, P- 101, and all metering pumps. The low-low level (Switch) (set at 0.5 ft) is a critical alarm device initiating alarm low-low level (switch) and it will also turn “OFF” the system if this switch is triggered. The level transmitter has similar set-points for high-high level (transmitter) and low-low level (transmitter). High-high level (transmitter) and low-low level (transmitter) are critical alarms and the system will not turn back on until the alarm is cleared by the BDGR operator. In addition, P-201 VFD fault (YA-201) is a critical alarm and it will turn off the system if this alarm is triggered.

Groundwater is transferred from T-201 via P-201 through a set of BFs (BF-201A/B) to the injection wells.

Downstream of P-201 there is a pressure transmitter (PT-201) and a flow transmitter (FIT-201), and downstream of BF-201A/B there is a pressure transmitter (PT-202) which relays instantaneous pressure and flow readings to the control system. A differential pressure over BF-201A/B is calculated from PT-201 and PT-202, DPI-201. If the differential pressure reading goes above a Bag Filters F-101A/B High Differential Pressure set point, then an alarm is initiated. If the Bag Filters BF-101A/B High-High Differential Pressure critical alarm (DPIT-101) is triggered than the entire system will shut “OFF”. The BDGR system will not turn back on until the critical alarm is cleared by the operator.

A flow totalizer is installed on each injection line at the influent manifold to totalize flow to each individual injection well. A flow rate is also calculated from the totalizer pulses to provide flow rate readings to the control system.

4.4 Remote Connection Procedure

The HMI can be operated locally as well as remotely using any web browser, or via a smart phone using the “C-More” application.

The following procedure explains the necessary steps to access the BDGR system HMI remotely.

1. From any web browser, such as Internet Explorer: Connection to the HMI is accomplished by going to the link (http://166.248.120.8080).

2. Select “Remote Access”, then Option 2 “With firewall connection”.

3. Click on “RUN” and the connection will be downloaded to your computer.

4. Once the connection is downloaded click on “RUN” again.

5. The system will prompt to enter username and password. Login credentials may be obtained from the Arcadis project manager. The user should have full access to all screens and controls.

4.5 Data History Trends, Data Logging Storage files and Collection

The HMI logs data to a removable USB flash drive. Data log files are text format and can be saved as such and opened as a Microsoft Excel table for further analysis. Readings are recorded every 10 minutes.

Data logs are emailed to personnel daily. Additional data is collected through HMI system screenshots.

The data log files and system screen captures are emailed to staff daily. The data collected includes all system flow rates and totals, pump runtimes, pressures, pH in T-201, and tank water levels.

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4.6 Alarms, Email Notification and Auto-Dialer Paging

The HMI is programmed to send an email notification to alert personnel of system alarms and warnings.

In addition, a daily data screen shot of the system overview is emailed to operators and the project manager.

4.7 List of Alarms:

Extraction Well Pump 1 (P-001) fault – Possible cause, pump over or under voltage.

Extraction Well Pump 2 (P-002) fault – Possible cause, pump over or under voltage.

Extraction Well Pump 3 (P-003) fault – Possible cause, pump over or under voltage.

Extraction Well Pump 1 Low Flow – Possible cause, leak in piping or well drawdown beyond pump intake.

Extraction Well Pump 2 Low Flow – Possible cause, leak in piping or well drawdown beyond pump intake.

Extraction Well Pump 3 Low Flow – Possible cause, leak in piping or well drawdown beyond pump intake.

T-101 Tank High-high level – Possible cause, performance issues with P-101 or blockage in tank outlet piping.

T-101 Tank Low-low level – possible cause, leak in tank and/or outlet piping, issues with P-101 VFD controls.

P-101 high discharge pressure – possible cause, blockage in discharge piping or BF-101A/B BFs.

P-101 fault – possible cause, pump over or under voltage or VFD fault.

BFs BF-101A/B high differential pressure – possible cause, fouling in BFs requiring BF changeout or blockages in piping.

LGAC Vessels high differential pressure – possible cause, fouling in LGAC vessels or blockages in piping.

T-201 Tank high-high level – Possible cause, performance issues with P-201 or blockage in tank outlet piping.

T-201 Tank Low-low level – possible cause, leak in tank and/or outlet piping, issues with P-201 VFD controls.

P-201 high discharge pressure – possible cause, blockage in discharge piping or BF-201A/B BFs.

P-201 fault – possible cause, pump over or under voltage or VFD fault.

BFs BF-201A/B high differential pressure – possible cause, fouling in BFs requiring BF changeout or blockages in piping.

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Injection Monitoring Tank High pH – possible cause, caustic metering pump control loop too aggressive (overshoot).

Injection Monitoring Tank Low pH – possible cause, caustic metering pump control loop too slow, metering pump performance issues, or leak in caustic line.

Treatment System Sump High Level – possible cause, leak(s) throughout system piping and/or tanks.

4.8 Telemetry Unit

The BDGR system is equipped with telemetry that will notify O&M personnel in the event that an alarm condition shuts down system operation. The telemetry unit consists of an Automation Direct C-More and cellular internet modem which can send system alarm notifications by text or email. The unit is equipped with a backup battery to provide emergency power in the event of a power outage and will send an alarm message notifying designated personnel of the power outage.

5 SYSTEM OPERATION LIMITS

5.1 BDGR System

The BDGR system process (groundwater extraction, groundwater treatment with BFs, LGAC Vessels, pH

Adjustment Tank) employs safety devices to prevent it from operating outside of the operating limits of the equipment or piping. These operating limits and safety devices are described in Sections 4.3 and 4.6 above.

6 SYSTEM OPERATION DETAILS

6.1 System Startup after Extended Deactivation

If the equipment has been idle for an extended period, follow the start-up procedure found in Appendix D.

6.2 System Start Up After an Alarm Condition Shutdown

Following a shutdown of the remedial system due to an alarm condition, the system is unable to be activated until the alarm is manually reset at the control panel. If the system has been deactivated due to an alarm condition, the following procedure will be implemented to restart the system.

Identify which alarm condition is activated in the system and place all switches associated with that alarm in the off position.

Investigate the equipment that was involved with the alarm.

Verify that all equipment associated with the alarm appears in good working order and make any necessary repairs.

Clear the alarm condition at the control panel.

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Turn the system switches to the “ON” or “AUTO” position, activating the system.

Observe the system as it cycles through all processes, placing additional scrutiny on the equipment that caused the previous alarm condition.

Observe the system for several minutes to confirm proper operation, maintaining additional scrutiny on the equipment that caused the previous alarm condition. Check back periodically during the day for signs of any deviations from the design operating parameters.

6.3 System Shutdown for Routine Maintenance

Due to various maintenance activities, one or several of the remedial system components may need to be deactivated for a short period of time. During deactivation, it is required to follow lockout/tagout procedures. A copy of the lockout/tagout standard operating procedure is included in Appendix E. To shut down the system push the “Disable” button on the HMI and the system will go through its shut-down procedures.

6.4 Extended System Shutdown

Should the system require deactivation for an extended period of time (i.e., greater than one month), extra precaution must be taken to avoid potential equipment damage while the system is dormant. The following steps document the activities that should be taken when the remedial system is to be deactivated for more than a month.

Deactivate the system following the system shutdown steps for routine maintenance specified above.

Remove as much water from the system as possible.

Close all groundwater valves at the manifold.

Open all breakers associated with system, except for those associated with the system buildings heaters, ventilation fans and control panels.

6.5 Emergency System Shutdown

In the event of a system condition that would require an emergency shutdown, hit the E-STOP button and if needed turn “Off” the main power disconnect for the system in a safe manner. Only trained staff or emergency personal with the correct personal protective equipment may turn off the main breaker with full load on the system.

7 SYSTEM OPERATION DETAILS

Routine O&M will be performed on the system during the work week (Monday – Friday) to ensure proper operation. Additional weekend visits may also be necessary to respond to system alarm conditions. O&M activities will consist of:

Performing routine inspections and maintenance on system equipment arcadis.com

Collecting treated system effluent samples according to permit requirements.

All data will be collected automatically by the HMI system and automatically distributed to engineers and operators.

8 EQUIPMENT MAINTENANCE

This section briefly documents the maintenance required on each component of the remedial system.

Maintenance Schedules are included in the text below and in the O&M Manuals of the equipment in

Appendix B.

8.1 BDGR System Mechanical Equipment

8.1.1 Bag Filters (BF-101A/B and BF-201A/B)

Bag filters should be changed out when differential pressures reach approximately 15 psi and housings should be cleaned as needed if solids build up in the vessels.

8.1.2 LGAC Vessels

LGAC will be checked for leaks and signs of damage. When carbon is present sampling will be done periodically to determine when the carbon needs to be changed. Double doors are located next to the carbon vessel to allow easy removal of the spent carbon from the vessels and easy filling of new carbon.

8.1.3 Heater

The blower fan wheel should be checked annually for any wear, corrosion or buildup of material. The wheel should be cleaned or replaced as required. The belt should be inspected for alignment and tightness quarterly. If the belt appears worn, it will be replaced with a belt that is within the manufacturers tolerances.

8.1.4 Fan

The fan wheel should be checked manually for any wear, corrosion or buildup of material. The wheel should be cleaned or replaced as required. The belt should be inspected quarterly.

8.1.5 pH Transmitter (AI-301B)

Calibrate the pH probe quarterly or as often as monthly when discharging to the storm sewer.

8.1.6 Pumps

Inspect for leaks, confirm inlet pressure is below engineer’s recommendation.

8.1.7 Flow Meters

Confirm internal screens are clear and free of debris, remove and flush as necessary.

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8.1.8 Level Switches

Confirm there is no solids build up and floats can move freely. Confirm that activated alarms function when switched.

8.1.9 Pressure Transducers

Confirm pressure transmitters are still calibrated within specifications. Send transducers out for calibration if needed.

9 EQUIPMENT MAINTENANCE

During the operation of the remedial system, some wastes may be produced that can be handled and disposed on Site, while other waste will require special care and transportation off Site for proper disposal. The following table lists wastes that may be produced during system operation and the means of disposal.

Waste Identification Handling and Disposal Procedure

Liquid Phase Granular Activated

Carbon

Spent LGAC will be handled and disposed of by the carbon vendor.

Carbon Spent carbon will be handled and disposed of by the multimedia vendor

Bag Filters BFs will be placed in 55-gallon steel drums and disposed of by a waste vendor.

Sodium Hydroxide Spent Sodium Hydroxide will be handled and disposed of by the chemical vendor.

Nitrile Gloves Gloves will be disposed of as general trash

Paper Towels Paper towels will be disposed of as general trash.