Revised Attachment G- SECTION 02 61 18.pdf

PWS PR-58

SECTION 02 61 18 Page 1

AMENDMENT 04

SECTION TABLE OF CONTENTS

DIVISION 02 - EXISTING CONDITIONS

SECTION 02 61 18

IN-SITU THERMAL REMEDIATION (ISTR)

REVISED June 13, 2022

PART 1 GENERAL

1.1 SUMMARY

1.1.1 Thermal Treatment Zone

1.1.2 Mass Estimates

1.2 REFERENCES

1.3 GENERAL REQUIREMENTS

1.3.1 Chemical Testing

1.3.2 Submittal Requirements

1.3.3 Sequencing and Scheduling

1.4 SUBMITTALS

1.5 REMEDIAL ACTION WORK PLAN (RAWP)

1.6 REGULATORY REQUIREMENTS

1.6.1 Permits and Licenses

1.6.2 Air Emissions

1.6.3 Noise Control

1.7 UTILITIES

1.7.1 Electrical

1.7.2 Natural Gas

1.7.3 Water Supply

1.7.4 Treated Water Discharges

1.8 QUALITY ASSURANCE

PART 2 PRODUCTS (NOT APPLICABLE)

PART 3 EXECUTION

3.1 EQUIPMENT

3.1.1 Above Ground Treatment Systems

3.1.1.1 Knock-out Tank and Moisture Separator

3.1.1.2 Vacuum Blower

3.1.1.3 Heat Exchangers and Cooling Towers

3.1.1.4 Liquid Treatment Equipment

3.1.1.5 Vapor Treatment Equipment

3.1.1.6 Instrumentation

3.1.1.7 Generator

3.1.1.8 Weather-proofing

3.1.2 ISTR Wellfield Requirements

3.1.2.1 Shallow Horizontal Vapor Extraction Wells

3.1.2.2 Performance Monitoring Wells

3.1.2.3 Pressure Monitoring

3.1.3 Temperature Monitoring Points

3.2 EXPOSURE MONITORING/AIR SAMPLING PROGRAM

3.2.1 Weather Station

3.2.2 Air Monitoring

3.2.2.1 Equipment

3.2.2.2 Work Zone Monitoring

3.2.2.3 Perimeter Monitoring via Field Screening

3.2.2.4 Perimeter Air Monitoring Data for Laboratory Analysis

SECTION 02 61 18 Page 2

3.3 BASELINE MONITORING

SECTION 02 61 18 Page 3

3.3.1 Temperature and Precipitation

3.3.2 Barometric Pressure

3.3.3 Groundwater Sampling

3.3.4 Soil Boring Sampling

3.3.5 Baseline Monitoring Report

3.4 SITE PREPARATION

3.5 ISTR SYSTEM INSTALLATION

3.5.1 Well Field

3.5.2 Equipment

3.5.3 Thermal Cover

3.5.4 Utilities

3.5.4.1 Stormwater Management

3.5.5 Process Piping

3.5.6 Electrical Cables

3.6 COMMISSIONING

3.6.1 Commissioning Team and Checklists

3.6.2 Tests

3.7 ISTR SYSTEM OPERATION

3.7.1 Operations

3.7.2 VOC Removal and Emissions

3.7.3 Process Monitoring

3.7.4 Combustible Organic Vapor Monitoring

3.8 PERFORMANCE CRITERIA

3.9 PERFORMANCE EVALUATION, CONFIRMATORY SAMPLING, SYSTEM

SHUTDOWN,REPORTING

3.9.1 Performance Evaluation

3.9.2 Confirmation Sampling

3.9.3 Shutdown

3.9.4 Interim Remedial Action Report

3.10 SYSTEM DECOMMISSIONING

3.10.1 Demobilization

3.10.2 Site Restoration

End of Section Table of Contents

SECTION 02 61 18 Page 4

SECTION 02 61 18

IN-SITU THERMAL REMEDIATION (ISTR)

PART 1 GENERAL

1.1 SUMMARY

Provide all personnel, equipment, facilities, materials, utility connections, and other items necessary to perform In Situ Thermal Remediation (ISTR) at the Site.

The Contractor shall be responsible for selecting the appropriate ISTR technology or combination of technologies within the Thermal Treatment Zone (TTZ) necessary to achieve performance criteria outlined in Part 3.8.

The presence of former infrastructure (i.e. missile silos, building foundations, and storm drains) shall be evaluated and considered by the Contractor when evaluating thermal treatment approach. Division of thermal treatment into stages may be necessary due to power requirements and/or period of performance limitations.

The ISTR system shall be capable of treating the onsite soils and groundwater. The Contractor shall be responsible for design and implementation of its selected ISTR approach, associated means and methods (e.g., heater well spacing and equipment), and overall schedule suitable for achieving the performance criteria within the period of performance.

All project data collected shall be made available through the project website, as required under Section 01 30 00 ADMINISTRATIVE REQUIREMENTS.

1.1.1 Thermal Treatment Zone

Thermal treatment is required for the in situ thermal treatment zones and drill cutting produced during the installation of ISTR wells. No soils will be transported off site for disposal, all soils will be thermally treated on site.

In situ thermal remediation treatment zone is approximately 33,000 square feet in area, 89,500 cubic yards (cy) in volume, and includes treatment intervals ranging from ground surface to 55 ft below ground surface (bgs) in the Area 1 and from ground surface to 80 ft bgs in the Area 2. The overburden extends to approximately 25-30 ft below ground surface, followed by an approximate 5-ft-thick weathered bedrock, underlain by competent bedrock. The TTZ extends approximately 25 and 50 ft below the competent bedrock in Areas 1 and 2, respectively. The thermal treatment areas and depths are designated on the Drawings.

1.1.2 2 Mass Estimates

An existing estimate of contaminant mass within the ISTR TTZ developed by the Government is included in Appendix A of the Design Analysis Report (DAR). Approximately 500 lbs. of constituents of concern (VOCs presented in Table 3-3 of the DAR) are present, predominantly above the overburden and competent bedrock interface based on soil data. Due to the inherent variability of mass estimates, the Contractor shall review and provide their own assessment of mass present within the treatment zone. For the purpose of equipment sizing and treatment train selection, the mass present within the TTZ shall be assessed within the Remedial Action Work Plan.

SECTION 02 61 18 Page 5

1.2 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ASTM INTERNATIONAL (ASTM)

ASTM D5092 (2016) Standard Practice for Design and

Installation of Ground Water Monitoring Wells in Aquifers

U.S. ENVIRONMENTAL PROTECTION AGENCY (EPA)

EPA SESDPROC-105-R2 (2013) Groundwater Level and Well Depth

Measurement

1.3 GENERAL REQUIREMENTS

1.3.1 Chemical Testing

Chemical sampling and analysis required in this section shall be conducted in accordance with SECTION 01 35 45.00 10 CHEMICAL DATA QUALITY CONTROL.

1. 3. 2 Submittal Requirements

Pre-construction and closeout submittals shall be provided in both hard copy and electronic files via file transfer or on disc. Other project submittals may be provided via electronic file transfer. Electronic files shall be compatible with the following software: Microsoft Office 2013, Adobe PDF, or Bentley Microstation V8i (or AutoCADD 2016 equivalent). If a part of a submittal is not available in electronic format, include a note describing which items were not provided in electronic format and explaining why the items could not be provided in electronic format.

1. 3. 3 Sequencing and Scheduling

Following the notice to proceed, the Contractor shall prepare pre-construction submittals, obtain permits, mobilize to the site, and conduct site preparation activities.

The phasing of treatment (if necessary), referred to herein as "stages" shall occur in a manner that does not allow recontamination of a treated area or from upgradient (west-northwest) to downgradient (east-southeast).

Similarly, the operation of each stage of treatment shall not impact newly treated areas by maintaining hydraulic and pneumatic control. Operation of one ISTR treatment stage may be conducted while the next ISTR treatment stage is being constructed to minimize the amount of downtime between operations. Where needed, the sheet pile and first few rows of well field infrastructure associated with the subsequent stage of treatment in an adjacent area may be installed to avoid construction near an operating well field or damage to the vapor cover. Prior to initiating construction at a new stage of treatment, approval shall be obtained from the Contracting Officer.

The sequence of work for each stage of treatment shall be as follows:

design, pre-mobilization, construction completion, commissioning, system operations, confirmation sampling to support shutdown, and post-shutdown cool down period. Baseline monitoring shall be completed prior to initiating commissioning. Commissioning of the full-scale system shall not be initiated until after receiving approval from the Contracting Officer.

Heating shall be conducted until soil clean up goals have been achieved

SECTION 02 61 18 Page 6 and verified by laboratory analysis, and then only after receiving approval for the Contracting Office.

1.4 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. While submittals with a “DO” designation are submitted to the Corp of Engineers District Office.

Submit the following in accordance with Section 01 33 00 SUBMITTAL

PROCEDURES:

SD-01 Preconstruction Submittals

Air Monitoring Plan; G, DO Remedial Action Work Plan; G, DO Work Plan Addendum; G, DO

SD-03 Product Data

Commissioning Team Commissioning Plan; G, DO Pre-Commissioning Tests; G, DO Pre-commissioning checks Exposure Monitoring/Air Sampling Program; G, DO

SD-06 Test Reports

Baseline Monitoring Report; DO Commissioning Report; DO Air Monitoring Data; G, DO

SD-10 Operation and Maintenance Data

Progress Soil Sampling Report; DO Confirmation Soil Sampling Report; DO Shutdown Memorandum; G, DO

SD-10 Operation and Maintenance Data

Weekly Progress Reports; G, DO Monthly Progress Reports; G, DO

SD-11 Closeout Submittals

Stage Specific Interim Remedial Action Completion Report; G, DO Interim Remedial Action Report; G, DO

1.5 REMEDIAL ACTION WORK PLAN (RAWP)

The Contractor shall prepare and submit for approval a RAWP within 90 calendar days of receiving the notice to proceed. Due to the phased nature of the work, each stage of ISTR will require a work plan addendum detailing any changes to the approach outlined in the RAWP and stage-specific treatment details omitted from the RAWP. The RAWP and associated addenda shall address all items as discussed in this specification and other relevant specifications, and shall include a project schedule in accordance with Section 01 32 01.00 10 PROJECT SCHEDULE. The RAWP shall include, but is not limited to, the following information:

SECTION 02 61 18 Page 7

a. Site preparation activities, including drawings to support utility connections such as stormwater drainage piping and tie-in for discharge of treated groundwater, water supply vault and piping, power drop/transformer and primary and secondary lines, and natural gas piping and meter.

b. Sequencing of work.

c. Drawings depicting the site layout: temporary facilities, equipment staging, utilities, treatment system layout.

d. The Contractor's basis of design for the ISTR well field and vapor and liquid treatment equipment.

e. Modeled estimates of energy input needed to reach target temperature and duration necessary to achieve performance criteria

f. Equipment sizing

g. Vapor cover design and stormwater management

h. Plan and Profile drawings depicting well field layout and construction (number, spacing, well construction diagrams, mechanical depiction of surface completion, above ground piping layout)

i. Process drawings: process flow diagrams, piping and instrumentation diagrams

1. Process controls description

m. COC mass calculations

n. Mass and energy balances

o. Electrical one-line diagrams

p. Treatment system layout: Vapor/liquid collection and treatment system layout

q. The estimated amount of energy, water, fuel, and other consumable materials (e.g., granular activated carbon) to operate the ISTR system throughout the duration of the treatment period

r. System data collection and monitoring summary: type, locations, and frequency

s. Generator sizing and operational plan (e.g., supplemental, backup, etc.)

t. Area Classification Assessment to evaluate potential for flammable or explosive conditions, identify NFPA classification, and specify appropriate equipment

u. Hot Soil and Hot Groundwater Sampling Standard Operating Procedures

v. Waste Management Plan

w. Traffic Control Plan

x. Air Monitoring Plan

y. Baseline Monitoring Plan

z. Noise Monitoring Plan

aa. Site Restoration Plan

bb. Summary of permitting requirements and permit applications

cc. Other information as required to demonstrate that the design, construction, and operational approach meets the Contract Documents.

Thermal treatment equipment and staging of drill cutting shall be placed in a location that minimizes impact to nearby residences and shall be offset from the boundary by at least 75 ft. All drill cuttings will be placed on and covered with poly, until they can be incorporated into the TTZ for treatment, and it is the responsibility of the Contractor to manage run off water.

Following submittal of the Draft RAWP, the Contractor shall schedule a Preconstruction and Work Plan Review meeting at EPA Region 2 according to Section 01 30 00 ADMINISTRATIVE REQUIREMENTS. Assume a 30-day government review period for the remedial action work plan.

SECTION 02 61 18 Page 8

1.6 REGULATORY REQUIREMENTS

1.6.l Permits and Licenses

Commence remedial construction onsite only after the relevant permit equivalency steps are met, other project approvals are obtained, and documentation submitted to the Contracting Officer. All remedial activities shall comply with federal, state, and local regulations and patent requirements. The Contractor shall comply with any additional permit requirements as necessary. 01 57 19 TEMPORARY ENVIRONMENTAL CONTROLS contains permit equivalents that may be required.

1. 6. 2 Air Emissions

Air emissions shall be monitored, controlled, and reported in accordance with all local, state, and Federal regulatory requirements. The Contractor shall submit a Registration of Air Pollution Control Equipment with the RIDEM Office of Air Resources. Vapor treatment equipment shall achieve at least a 95 percent destruction and removal efficiency. Supplemental generators used onsite for non-emergency purposes shall be EPA Tier 4 Final certified.

1. 6. 3 Noise Control

The ISTR extraction and treatment system, including backup support equipment, shall not exceed 60 A-weighted decibels (dBA) during daytime operations from 0800 to 2200 or 50 dBA during nighttime operations from 2200 to 0800 at any point along the site property boundary.

The Contractor shall provide details in the RAWP identifying how noise levels will be monitored and managed to ensure noise levels associated with the site will not be exceeded.

1.7 UTILITIES

The Contractor shall be responsible for all utility costs, including but not limited to usage, distribution, and other fees associated with energy, water, fuel, and other consumable materials to meet project objectives.

The Contractor shall be responsible for the design, permitting, furnishing, and installation of all utilities required to support the Contractor's selected operations.

The Contractor shall locate subsurface utilities such as water, gas, and sewer lines prior to establishing connections and tie-ins.

1. 7. 1 Electrical

Overhead power lines owned and operated by National Grid are available along Babcock Road near the Site. The Contractor shall be responsible for the design, procurement, and installation of the primary power service drop to supply all required power for operations, including all required coordination with the local power utility company and all engineering support required to evaluate the adequacy of the existing overhead service lines to support the Contractor’s power needs. The primary service lines connecting the power drop to the transformer shall be buried.

The power service drop shall include all infrastructure required to connect to the existing overhead power service at Babcock Road and to bring the required power to the Contractor's ISTR infrastructure.

SECTION 02 61 18 Page 9

The power service drop shall include separate service metering to allow for tracking of the Contractor's power usage and costs. The design, permitting, procurement, and installation of the power service drop shall be incorporated into the pre-construction period in the Contractor's project schedule.

The Contractor may consider implementing diurnal power usage variations, such as limiting power usage during daytime hours and increasing power usage at night, to minimize the impact to the utility provider in order to reduce overall utility costs.

1. 7. 2 Natural Gas

A natural gas line owned and operated by National Grid runs underneath Babcock Road on the southern side of the Site. If natural gas is utilized within the ISTR system, the Contractor shall be responsible for its design, procurement, and installation to support the Contractor's selected operations, including all required coordination and submittals to the natural gas utility company. The natural gas connection shall include service metering to allow for tracking of the Contractor's usage and costs.

The design, permitting, procurement, and installation of anew tap or an upgrade to the existing line shall be incorporated into the pre-construction period in the Contractor's project schedule. National Grid indicated that they do not typically provide temporary natural gas service.

The Contractor shall be responsible for independently negotiating with the utility provider if natural gas is to be used.

1. 7. 3 Water Supply

The Contractor's water service design shall include all coordination required with local water utility representatives to evaluate the adequacy of the existing water service for supporting the Contractor's needs. A potable water service line owned and operated by Quonset Development Corporation is available underneath Babcock Road on the southern side of the Site. The water service installation shall include all infrastructure required to connect the existing water service in Babcock Road to the Contractor's ISTR infrastructure, including furnishing and installing a new water main tap (if needed), a below ground vault for the water meter and backflow preventer, and trench work to convey water to the ISTR system.

The government prefers that the potable water line be buried below ground due to the contract's period of performance and prolonged periods below freezing temperature; however, the Contractor shall propose the appropriate water line construction and method for protecting against freezing. Water connection details are subject to approval by Quonset Development Corporation prior to construction. The water service shall include separate service metering to allow tracking of the Contractor's water usage and costs.

1. 7. 4 Treated Water Discharges

Treated water can be discharged to the stormwater drain adjacent to the TTZ that discharges to Allen Harbor, under a Rhode Island Pollutant Discharge Elimination System(RIPDES) permit. The Quonset Development Corporation does not allow groundwater to be discharged to the sanitary sewer.

The Contractor shall design, furnish, install, test, and operate all equipment and facilities required to treat its wastewater discharges. In the event of a permit exceedance, the Contracting Officer shall be notified immediately, and a corrective action plan implemented. The Contractor shall be solely responsible for any permit/discharge violations resulting from their operations. All treated contact process water shall meet the

SECTION 02 61 18 Page 10 appropriate discharge requirements.

SECTION 02 61 18 Page 11

During startup and commissioning, analytical results demonstrating achievement of permit limits shall be available prior to discharging. In the event of a permit exceedance, the Contractor shall provide analytical results and sufficient lines of evidence demonstrating treated water is within permit limits prior to discharging.

1.8 QUALITY ASSURANCE

The Contractor shall be responsible for project quality control and establish and maintain an effective quality control system in accordance with 01 45 00.00 10 QUALITY CONTROL and 01 35 45.00 10 CHEMICAL DATA QUALITY CONTROL. The Quality Control (QC) system shall include plans, procedures, and organization necessary to complete the work. Documentation shall be maintained to provide evidence that the required quality control activities and tests were performed as required by the RAWP, UFP-QAPP, and CQCP. Documentation records shall also include work performed by subcontractors.

The Contractor shall photographically record the ISTR process, including shallow excavation and onsite thermal treatment, in accordance with Section

01 30 00 ADMINISTRATIVE REQUIREMENTS.

Onsite audits and inspections by the Government shall be permitted throughout all phases of the remedial construction and operation.

PART 2 PRODUCTS (NOT APPLICABLE)

PART 3 EXECUTION

3.1 EQUIPMENT

The following equipment are common components of ISTR systems. The Contractor may propose alternative components in the RAWP based on their approach. Any additional equipment not specified below shall be included in the RAWP. All equipment and components proposed in the RAWP shall be described in detail. The components utilized shall be designed, installed, constructed, operated, controlled, and monitored as one complete, compatible unit. All components utilized at the site shall be constructed of materials that are thermally and chemically compatible with the contaminants and temperatures of the vapors and liquids recovered. All equipment shall be properly rated for the environment and location where it will be operating, to include the potential for being in contact with hazardous materials as well as extreme weather. Equipment shall conform to pertinent local and national codes.

3.1.1 Above Ground Treatment Systems

3.1.1.1 Knock-out Tank and Moisture Separator

Provide knock-out tank and moisture separator with capabilities to separate, demist and condense significant moisture from the influent soil vapor and groundwater being recovered. The separator shall have sufficient holding capacity to allow constant operation without shutdowns of the overall system. Equipment shall be constructed of suitable material for its intended purpose and incorporate the necessary gauges, piping, valves, sensors, and level control switches, or equivalent, to allow its effective and continuous functioning.

SECTION 02 61 18 Page 12

3. 1. 1. 2 Vacuum Blower

Provide vacuum blower(s) with motors properly sized and sheaved to accommodate sufficient vacuum and air flow rate (plus a safety factor) for recovering soil gas and steam from the subsurface. The blower(s) shall be engineered for continuous long-life operation in an equivalent soil vapor extraction mode. The blower(s) shall be equipped with motor starters, variable speed drives, inlet filters, check valves, silencers, relief valves, or equivalent and other components recommended by the manufacturer for its intended use. Contractor shall provide soundproofing, as necessary, to comply with local or county noise ordinances and noise requirements identified in in Section 1.5.3 above.

3. 1. 1. 3 Heat Exchangers and Cooling Towers

Provide heat exchangers and cooling towers or chillers necessary to provide proper heat exchange, condensing and cooling needs for the recovered vapors and other process and treatment components of the ISTR system. System blowdown and any additives shall be adequately treated prior to discharge or re-used in order to comply with applicable wastewater discharge limitations, including temperature.

3. 1. 1. 4 Liquid Treatment Equipment

Provide liquid equalization, separation, handling and treatment equipment.

This equipment shall be properly sized to accommodate the range of expected flows and contaminants in order to meet applicable discharge limitations for the duration of the ISTR and post-treatment operating period. Redundancies or provisions of spare equipment shall be incorporated to avoid unplanned shutdown of the ISTR system due to equipment failure. Emergency contingency storage for untreated wastewater shall be planned in the event of temporary shutdown of any equipment.

3. 1. 1. 5 Vapor Treatment Equipment

Vapor handling and treatment equipment shall be properly sized to accommodate the range of expected flows and contaminants in order to meet applicable vapor emission limitations for the duration of the ISTR and post-treatment operating period. Contractor shall incorporate redundancy or provisions for spare equipment to avoid unplanned shutdown of the ISTR system due to equipment failure. Discharge stacks shall be properly sized with sufficient height to meet applicable dispersion requirements, and secured for stability.

Condensate accumulating in carbon vessels or the discharge stack shall be containerized and routed into the liquid treatment system. If a thermal oxidizer is used, a bypass vapor extraction with activated carbon vessels shall be incorporated into the Contractor design for immediate use in the event the thermal oxidizer is taken offline for maintenance.

3. 1. 1. 6 Instrumentation

Provide instrumentation and controls (indicators, sensors, transmitters, recorders, alarms, auto-dialers, etc.) necessary to monitor and operate theequipment continuously, remotely, and safely. Such equipment shall detect,monitor, record, and control key operating parameters such as liquid levels, equipment and air temperatures, gas and liquid flow rates, pressures, etc. Emergency stop switches shall be incorporated into the design to immediately shutdown power to all equipment. At a minimum, e-stops shall be placed at one location outside the TTZ (near the entrance to the ISTR treatment area, and easily accessible to a first responder and near the ISTR well field and above ground treatment area.

SECTION 02 61 18 Page 13

The system control panel shall contain at a minimum all local control devices, circuit breakers, power control transformers, system disconnect switches, and alarm components as necessary to operate the system effectively and safely. The control system shall provide all functions required for complete automatic and manual operation of the system, including but not limited to the following:

1. System shutdown and alarm on high-high liquid level conditions in moisture separator, other liquid handling equipment, and discharge locations,

2. Manual start and stop for blowers,

3. System shutdown in the event that the secondary containment around critical process vessels indicates a spill,

4. System shutdown and alarm on low and no flow in system,

5. Automatic call-out and notification in the event of an alarm,

6. Automatic shutdown when an emergency stop is engaged.

The control system shall also be furnished with a means to allow for remote, real-time access to monitoring data and data retrieval.

3. 1. 1. 7 Generator

The Contractor shall provide a back-up power source capable of operating the ISTR vapor and liquid extraction and treatment equipment as well as monitoring and controls to maintain pneumatic and hydraulic control if the primary power source is lost. The backup power source shall be capable of maintaining pneumatic and hydraulic control without refueling for at least 24 hours. Backup power shall engage automatically upon loss of primary power (e.g., automatic transfer switch). The RAWP shall detail the Contractor's quality control methods to ensure the integrity of the backup power system is maintained.

Supplemental generators used onsite for non-emergency purposes shall be EPA Tier 4 Final certified.

3.1.1.8 Weather-proofing

All outdoor installation shall be weather-proof and all installations in hazardous locations shall meet NEC, NFPA, UL, NEMA, and OSHA requirements.

The ISTR system shall be winterized to allow operation during subfreezing conditions. Winterization may include, but is not limited to, insulation and heat trace around piping and liquid vessels, insertion heaters and recirculation within liquid storage vessels.

3.1.2 ISTR Wellfield Requirements

The following minimum requirements apply to select elements of the ISTR well field extraction and monitoring system.

3.1.2.1 Shallow Horizontal Vapor Extraction Wells

Shallow horizontal vapor extraction wells shall be sized and spaced according to the project work plans and plumbed into the vapor extraction system during the construction phase of the project.

Ensure design flow assumptions for horizontal extraction wells are stated within RAWP.

SECTION 02 61 18 Page 14

3.1.2.2 Performance Monitoring Wells

Within the ISTR TTZ, performance monitoring wells are not required because the intent of the ISTR application is to boil off all of the liquids within the TTZ. Multiphase extraction wells may be used for monitoring after the cooldown period. Sampling frequency is detailed in the Design Analysis Report (attached).

To demonstrate hydraulic control, existing downgradient monitoring wells shall be used as specified in the Design Analysis Report.

1. Monitoring wells shall be sealed and constructed with materials, fittings, and surface completions compatible with chemicals, temperatures, and pressures expected during ISTR operations. Pumps shall be deployed prior to startup and sample ports and valving configured to prevent the need to open a monitoring well during operations. Hot water sampling methods shall be detailed in the project work plans.

In general, wells shall be constructed to monitor a significant portion of the saturated interval with final well construction detailed in the RAWP.

3.1.2.3 Shallow Pressure Monitoring

Pressure monitoring points (PMPs) shall be installed and monitored to confirm that the extraction system is adequately capturing steam and vapors throughout the TTZ. PMPs shall be screened within the top 18 inches of the TTZ, placed up to 5-ft outside of TTZ perimeter and spaced every 150 feet. PMPs shall be installed every 2,000 square feet within the TTZ and screened according to the

RAWP.

3. 1. 2.4 Temperature Monitoring Points

Temperature monitoring locations shall occur every 1,750 sq ft throughout the TTZ, and in general, located at the centroid of the heating elements, extend across the entire vertical treatment interval with sensors placed every 5 vertical feet. The first sensor will be place 1 ft bgs, followed by one at 5 ft bgs, and then at each 5-ft interval until the bottom of the TTZ. Final locations are subject to Contracting Officer approval.

3.2 Exposure Monitoring/Air Sampling Plan

Prepare and implement an exposure monitoring/air sampling program to identify and quantify SOH hazards and airborne levels of hazardous substances in order to assure proper selection of engineering controls, work practices and personal protective equipment for affected site personnel. Include action levels for upgrading and downgrading PPE in the program. Submit personnel exposure monitoring and sampling results.

Monitoring shall be for all site Contaminants of Concern (COC) as well compounds that may be generated during thermal treatment that may pose an exposure hazard.

3.2.1 Weather Station

A dedicated weather station shall be installed prior to baseline monitoring. The station shall be capable of collecting weather data for temperature, atmospheric pressure, humidity, wind speed, wind direction, and precipitation. Collected data shall be precise enough to meet project objectives. Weather station data shall be collected, at a minimum, daily during working days and reported in the daily quality control reports.

SECTION 02 61 18 Page 15

3.2.2 Air Monitoring

In conjunction with the air sampling program, the Contractor shall develop and implement an Air Monitoring Plan to address air monitoring for public and employee protection purposes. The Contractor shall report all field data sheets relating to the work zone and perimeter air monitoring. Air monitoring data shall be submitted in an electronic format on a monthly and as needed basis. The Air Monitoring Plan will be submitted as an appendix under the Remedial Action Work Plan. Any exceedance of an action level shall be reported immediately to Contracting Officer. Corrective actions shall be implemented and communicated to the Contracting Officer.

3. 2. 2. 1 Equipment

Monitoring of work zone via photoionization detector (PID) shall be performed in accordance with the approved Air Monitoring Plan. A figure showing the proposed locations shall be provided to the Contracting Officer for approval prior to commencement of construction activities.

A windsock or weathervane shall provide a visual indication of wind direction.

3.2.2.2 Work Zone Monitoring

Air monitoring shall be conducted with a PID for Volatile Organic Compounds (VOCs)during construction and operations. All air monitoring data shall be made available to the ContractingOfficer. This data will also be submitted with the field sampling report.

The Contractor shall complete hourly checks of the air monitoring device during intrusive activities to verify action levels are not exceeded.

Increased monitoring frequency may be required during intrusive activities that have the potential to generate more emissions, such as trenching and/or drilling activities.

3.2.2.3 Perimeter Monitoring via Field Screening

Perimeter air monitoring will be conducted with a PID monitor (or approved equivalent). The purpose of the perimeter air quality-monitoring program is to confirm that site operations are not adversely affecting off-site receptors. Monitoring shall be performed at up to five locations.

Monitoring data shall be available in real-time, logged continuously, and remotely accessible. Data shall be stored to allow users to assess trends immediately in the event of an odor, loss of pneumatic control, or public complaint. Data shall also be stored in a manner to allows retrieval for trend analysis.

3. 2. 2. 4 Perimeter Air Monitoring Data for Laboratory Analysis

In addition to the continuous air monitoring through a PID monitor, the Contractor shall collect time integrated air samples from up to five locations for laboratory analysis of COCs using EPA Methods capable of meeting detection limits specified in the approved QAPP. Collection of air monitoring data for analytical analysis shall be conducted during baseline (no operations), and monthly during site heat up (prior to producing steam), and every other week until system shutdown. The Contractor may petition the government to reduce perimeter air monitoring frequency. The air samples shall be collected as approved in the air monitoring plan. In the event of loss or suspected loss of pneumatic control, the Contractor shall be prepared to take immediate corrective action which may include collection of additional air samples to assess presence of fugitive emissions.

SECTION 02 61 18 Page 16

3.3 BASELINE MONITORING

Baseline monitoring shall not be initiated until after the RAWP has been approved, and written approval has been provided be the Contracting Officer. Notify the Contracting Officer at least 14 calendar days before starting baseline monitoring.

3.3.1 Temperature and Precipitation

Ambient temperature readings shall be recorded at least daily during baseline monitoring. Temperature readings shall also be recorded each time that barometric pressure readings are recorded. Temperature readings shall be recorded to the nearest 1.0 degree F. Precipitation shall be measured daily during baseline monitoring activities. Precipitation readings shall be recorded to the nearest 0.1 inch.

3.3.2 Barometric Pressure

Barometric pressure readings shall be recorded 3 times per day for 3 consecutive days. Pressure readings shall be recorded to the nearest 0.1 inch of mercury.

3.3.3 Groundwater Sampling

Groundwater monitoring shall be performed in accordance with the Design Analysis Report. Water levels shall be recorded for each of the groundwater monitoring wells. Water level measurements for all designated wells shall be completed in not more than 48 hours, from start to finish. Water level measurement shall be performed in accordance with EPA SESDPROC-105-R2 and groundwater sampling in accordance with the approved UFP-QAPP. Water level readings shall be recorded to the nearest 0.01 foot and the tape and probe decontaminated after each measurement.

3.3.4 Soil Boring Sampling

For the ISTR treatment areas, samples shall be collected from soil borings via sonic drilling methods. Baseline soil sampling shall include borings every 1,750 square feet and samples collected from each 5-foot interval throughout the thermal treatment zone based on either field screening or pre-set intervals. The first sensor will be place 5 ft bgs and then every 5-foot interval until the bottom of the TTZ(i.e., 6 samples per boring).

All soil cores shall be continuously logged by a geologist. Sample locations shall be proposed in the RAWP and approved by the Contracting Officer. Sampling locations may be co-located with other ISTR infrastructure such as temperature monitoring points where possible.

Contractor shall use a Rhode Island State licensed driller and obtain permits for the soil boring work as required. Upon completion of sampling, all borings shall be properly abandoned with steam tolerant grout and in accordance with applicable agency requirements. All soil borings, if not completed as TMPs, will use abandonment methods that are compatible with the ISTR system's operational pressures and temperatures.

3.3.5 Baseline Monitoring Report

Submit a baseline monitoring report. A period of 21 calendar days shall be allotted in the schedule for Government review. Results of Baseline Monitoring shall be organized according to category and shown chronologically within each category. The report shall include monitoring locations (and depths, if applicable), and sample identification numbers.

Separate plan view maps shall also be prepared, showing monitoring locations and depths, and the results of groundwater monitoring, groundwater levels, and soil boring sampling.

SECTION 02 61 18 Page 17

3.4 SITE PREPARATION

The following are known site features and infrastructure present within or in the vicinity of the ISTR which require improvement or action prior to installation of the ISTR System :

1. Removal of existing site fencing and installation of fencing around the

ISTR, the existing fence can be reused(see Design Analysis Report Drawings for requirements).

2. The wind break curtain and poles shall be removed and stored on site for re-use at the end of the project.

3. Existing wells that are not compatible with ISTR located in the ISTR area or area of thermal influence. All wells within the area of thermal influence which are not compatible with the proposed ISTR shall be abandoned in accordance with local and state requirements and in a manner that is compatible with ISTR system operational pressures and temperatures.

4. The trees within the TTZ shall be removed, along with the root-balls, which will be shipped off-site for disposal. The Contractor shall remove surface vegetation and debris as required by the proposed ISTR system. Construction debris may be characterized and disposed off-site.

5. Due to the various site uses over the years, there are subsurface abnormalities within the TTZ. Therefore, wellfield adjustments may be needed if any obstructions or other subsurface features are encountered. In the RAWP, the Contractor shall outline potential field adjustments that can be made to accommodate subsurface obstructions.

Once constructed and prior to startup, an as-built well survey shall be conducted to document ISTR well field locations and vapor cover extent (if different than pre-construction locations).

The approach for addressing each of the above items shall be included in the RAWP. The RAWP shall also include the details and approach for any other site preparation required based on the Contractor's proposed ISTR implementation approach (e.g., site re-grading for proper drainage or treatment equipment placement, imported fill material requirements for vapor caps or insulating covers placed on the ISTR surface).

3.5 ISTR SYSTEM INSTALLATION

3.5.1 Well Field

Perform a review of current site conditions, available utility maps, and other available site information prior to conducting invasive site activities. Installation of the ISTR well field may require penetration through concrete slabs and other materials.

Previous site experience has shown that rotosonic drilling method is the most reliably effective method for drilling to target depths. The Contractor may utilize an alternate drilling method; however, the Contractor shall be responsible for all costs incurred if the alternate drilling method is not successful.

Provide drawings showing details and locations of the heater elements and monitoring points in the RAWP. Utilize survey locations for the heater elements, monitoring points, and monitoring wells within each treatment

SECTION 02 61 18 Page 18 area to verify correct placement of the required ISTR components within each area. Surveying shall be completed in accordance with Section 01 11 10

SURVEYING.

ISTR components shall be constructed and installed in accordance with RIDEM Regulations, EPA Region 1 Quality Assurance Manual, ASTM D5092,and other applicable local, state, and federal requirements. Permits and permit equivalents required to perform the work shall be obtained prior to commencement of drilling and well installation operations. Complete all required utility clearances prior to conducting any intrusive site activities.

Provide and install all required subsurface and surface components of the ISTR system. Heating elements, wells, and monitoring points shall be suitable for the Contractor's selected thermal treatment approach.

Install shallow horizontal vapor extraction wells in all ISTR areas to ensure soil/steam vapor recovery and that no steam releases are observed during operations. The extraction system blowers shall be sized to accommodate shallow horizontal extraction across the treatment area and constructed in a manner to allow immediate activation if needed for pneumatic control.

Drill cuttings will be staged on site, placed on, and covered with poly, util they can be placed in depressions in the TTZ (tree root balls) for treatment on site. The drilling cuttings will be compacted and covered with a 4-6” dense grade aggerate (DGA). Drilling fluids shall be containerized, liquids shall be treated by the on-site ISTR system, and settled out sediment shall be combined with the drilling cuttings for on-site treatment. All other waste generated during installation shall be containerized and disposed of in accordance with waste management procedures described in the UFP-QAPP and Section 01 57 19 TEMPORARY

ENVIRONMENTAL CONTROLS.

3.5.2 Equipment

The Contractor shall be responsible for preparing the site for equipment installation prior to delivery and off-loading of equipment and system components. Equipment staging shall be performed in accordance with the

RAWP.

The Contractor shall provide inspection certificates for the drill rig, heavy equipment, and other installation equipment prior to the start of drilling activities. It is the Contractor's responsibility to properly construct the ISTR wellfield in accordance with the RAWP. All equipment shall be decontaminated prior to leaving the site.

3.5.3 Thermal Cover

The Contractor shall install an insulating cap capable of achieving a minimum R-value of 15, covering and extending a minimum of 10 ft past the horizontal extents of the TTZ because soil impacts are within 5 ft of ground surface. The Contractor will be responsible for providing documentation that the thermal cover design meets the minimum R-value, either by third party testing or calculations based the cover material documented R-value for its intended use.

The insulating cover shall be graded and sloped as necessary to prevent ponding on the cap. The cap shall extend horizontally at a minimum of 10 ft beyond the TTZ. The cover shall be regularly inspected and repaired as needed (i.e., sealing cracks) to prevent fugitive emissions.

SECTION 02 61 18 Page 19

The Contractor shall provide safe and stable access for sampling equipment (e.g., drilling rigs) to enter the ISTR wellfield for purposes of collecting soil and groundwater samples for demonstrating attainment with the performance objectives identified.

The impact that the footprint of the thermal cover has on stormwater runoff shall be considered within the construction and stormwater permits detailed in Section 01 57 19 TEMPORARY ENVIRONMENTAL CONTROLS. If required, upgrades to stormwater drainage features shall be detailed in the RAWP.

3.5.4 Utilities

All work outdoors and in wet conditions shall be weatherproof. All material, equipment, and incidentals in hazardous locations shall meet National Electrical Code (NEC), National Fire Protection Association (NFPA), UL, NEMA, and Occupational Safety and Health Association (OSHA) requirements for hazardous locations. Proper electrical grounding shall be installed for all equipment as applicable.

The Contractor is responsible for furnishing and installing all components necessary to connect the ISTR system to existing utilities. All utility work shall be performed in accordance with state, local, and National Codes and requirements for the relevant utility.

3. 5. 4. 1 Stormwater Management

Stormwater collection and conveyance systems shall be designed as necessary to prevent interference with the ISTR system. Stormwater collection piping associated with former site uses is not expected to be found in the TTZ but abandoned piping may exist on the property including within the ISTR treatment area. The contractor is responsible for identifying the locations and impact of existing features on their operations. The Contractor shall design the ISTR to account for possible infiltration of site surface water.

3. 5. 5 Process Piping

All vapor and liquid recovery and treatment piping shall be properly constructed to prevent any media from condensing or collecting where it would not be recovered or otherwise interfere with effective operations.

All piping and materials of construction shall be compatible with the temperatures and chemicals expected to be present. The Contractor shall ensure that the installed piping, hoses, and orifices are of sufficient size to transmit soil vapor, groundwater, and process water, blow-down, treated air, and other media without any significant pressure drop or restriction to the system. All piping and connections shall be installed, properly supported, and maintained in a neat and workmanlike manner. The Contractor shall also account for heavy snowfall and the full range of ambient temperatures expected as to minimize impact of climate on ISTR operations. Hot piping (if uninsulated) that presents a worker exposure risk shall be properly labeled.

3.5.6 Electrical Cables

The layout of electrical supply lines and cables between power distribution equipment and the well field and treatment system shall consider use of conduit, ramps, and cable bundling to minimize slip, trip, and fall hazards and exposure to vehicle traffic. All cables and conductor shall be rated for electrical loading specified in the RAWP and constructed with materials compatible with its designated environment.

SECTION 02 61 18 Page 20

3.6 COMMISSIONING

Commissioning shall not be initiated until the Commissioning Plan has been approved, and written approval has been provided by the Contracting Officer. Notify the Contracting Officer at least 14 calendar days before starting commissioning. Commissioning shall occur for each stage (if needed)of thermal treatment; however, a separate commissioning plan is not required for each stage of treatment. Significant changes to the Commissioning Plan shall be submitted as an addendum. Combustible organic vapor monitoring shall be performed during commissioning in accordance with Part 3.7.6 Combustible Organic Vapor Monitoring.

3.6.1 Commissioning Team and Checklists

Designate team members to participate in the pre-commissioning checks and the functional performance testing. Pre-commissioning check lists shall detail the critical system interlocks including type of alarm (shutdown or warning), instrument involved, and equipment affected by the alarms. The Government will be represented by a representative of the Contracting Officer, the Design Agent's Representative, and the Using Agency. The team members shall be as follows:

Designation Function

Q Contractor 's Chief Quality Control Representative

M Contractor 's Mechanical Representative

E Contractor's Electrical Representative

T Contractor's Testing, Adjusting, and Balancing Representative

C Contractor's Controls Representative

0 Contracting Officer's Representative

Commissioning checklists shall be included with the Commissioning Plan.

Each checklist shall be completed by the commissioning team. Acceptance by each commissioning team member of each pre-commissioning checklist item shall be indicated by initials and date. Acceptance by each commissioning team member for each functional performance test checklist shall be indicated by signature and date.

3.6.2 Tests

The pre-commissioning checks and functional performance tests shall be performed in a manner that essentially duplicates the checking, testing, and inspection methods established in the related Sections. Where checking, testing, and inspection methods are not specified in other Sections, methods shall be established and documented which will provide the information required. Testing and verification required by this section shall be performed during the Commissioning phase. Requirements in related Sections are independent from the requirements of this Section and shall not be used to satisfy any of the requirements specified in this Section. Provide all materials, services, and labor required to perform the pre-commissioning checks and functional performance tests. A

SECTION 02 61 18 Page 21 pre-commissioning check or functional performance test shall be aborted if any system deficiency prevents the successful completion of the test or if any participating non-Government commissioning team member of which participation is specified is not present for the test.

a. Pre-commissioning Tests: Pre-commissioning checks shall be performed for the items indicated on the checklists. Deficiencies discovered during these checks shall be corrected and re-tested in accordance with the applicable contract requirements.

b. Functional Performance…