Amendment_2_Revised_PWS_10_20_16.pdf

Performance Work Statement for

Mesa Substation Soil Remediation

Mesa, Maricopa County, Arizona ADEQ Voluntary Remediation Program Project Number B2021625

Date Prepared: October 20, 2016

United States Department of Energy Western Area Power Administration

615 South 43rd Avenue Phoenix, Arizona 85009

MESA SUBSTATION SOIL REMEDIATION MONITORING

i

TABLE OF CONTENTS

SECTION 1 – PROJECT BACKGROUND AND EXISTING CONDITIONS

A. PROJECT LOCATION AND DESCRIPTION

B. BACKGROUND AND EXISTING CONDITIONS

C. PROJECT ORGANIZATION AND CONTACTS

SECTION 2 – GENERAL REQUIREMENTS

A. GOVERNMENT PERSONNEL

B. CONTRACTOR PERSONNEL

C. COMMENCEMENT, PROSECUTION, AND COMPLETION OF WORK

D. RESOURCE EXCLUSION AREA

E. SUBMITTAL PROCEDURES

F. LICENSES AND PERMITS

G. SAFETY MEETINGS

H. QA/QC

I. EQUIPMENT

J. ELECTRICAL MINIMUM APPROACH DISTANCE (MAD)

K. GROUNDS, BONDS, AND OTHER PROTECTIVE DEVICES

L. DAMAGE TO PROPERTY

SECTION 3 – WORK REQUIREMENTS

A. PROJECT OBJECTIVE

B. SCOPE OF WORK

SECTION 4 – DELIVERABLES

A. HEALTH AND SAFETY PROGRAM

B. COMMUNITY INVOLVEMENT PLAN

C. JOB HAZARD ANALYSIS (JHA)

D. EXCAVATION PLAN

E. ACCIDENT RECORDS AND REPORTING

MESA SUBSTATION SOIL REMEDIATION MONITORING

ii

F. PROTECTIVE GROUND LEADS

G. OPERATOR REQUIREMENTS

H. TESTING AND DATA

I. PERSONAL PROTECTIVE EQUIPMENT (PPE)

J. WORK SCHEDULE

K. REMEDIAL COMPLETION REPORT

MESA SUBSTATION SOIL REMEDIATION

SECTION 1 – PROJECT BACKGROUND AND EXISTING CONDITIONS

A. PROJECT LOCATION AND DESCRIPTION

The site comprises of Maricopa County Assessor’s Parcel Number 137-04-007B, an approximate 9.22-acre parcel, located at the northwest corner of E. University and N. Lazona Drives in Mesa, Arizona, as depicted in Figure 1 of the attached Voluntary Remediation Program Remedial Workplan (VRPRW). The site is surrounded by Mesa School District offices to the north, commercial properties to the west, a paved access road to the east, and University Drive to the south. The northwest corner of the site is asphalt-paved and leased as a parking lot. The site is bound by a block wall on the south, and chain-linked fencing on the remaining sides.

Except for the parking lot and some relatively small concrete pads, the site is unpaved. Two buildings are located on the site. An 800-square-foot warehouse is located near the southeast corner of the site. A 1,584-square-foot control building is located near the southwest corner of the site. The control building is associated with a decommissioned oil handling system. The oil handling system consisted of buried and exposed piping emanating from the control building, portions of which can be seen in Figure 2 of the attached VRPRW. Two 14,000-gallon above-ground oil storage tanks were formerly located southeast of the control building; these have been removed, but their concrete supports remain. One out-of-service groundwater production well is also located at the site. Building plans, provided by the COR, are included with this contract.

B. BACKGROUND AND EXISTING CONDITIONS

The site entered the Arizona Department of Environmental Quality (ADEQ) Voluntary Remediation Program (VRP) in 2012. Subsequently, an environmental investigation of the site was performed in order to characterize the existing on-site conditions. The conclusions and recommendations of this investigation are summarized in Section 2.0 of the attached VRPRW.

The site may include existing ground grid cables throughout the jobsite. These shall be removed as needed in order to complete the scope of this PWS. There is no separate line item for this work.

Refer to the attached drawings for estimated locations. Ground grid is minimum #4 bare copper cable buried approximately 18-inches below grade at 20-feet interval’s both directions.

C. PROJECT ORGANIZATION AND CONTACTS

This project will be performed under ADEQ VRP. Key Western and ADEQ personnel for this project include the following:

Western Area Power Administration:

Contracting Officer (CO): Gregory K. Cagle Contracting Officer’s Representative (COR): David L. Pflanz Alternate Contracting Officer’s Representative (ACOR): Roger L. Moody Project Manager: Michael Baird Project Engineer: David L. Pflanz Environmental Manager: Linda Marianito

ADEQ:

VRP Project Manager: Nichole Osuch

SECTION 2 – GENERAL REQUIREMENTS

A. GOVERNMENT PERSONNEL

The Contracting Officer (CO) is the individual executing this contract on behalf of the Government, and is responsible for the overall administration of the contract. They are the only person authorized to make any changes in the prices, terms, or other conditions of the contract.

The Contracting Officer’s Representative (COR) is responsible for providing the Contractor with any special technical instructions or guidance necessary to ensure contract execution. The COR has no authority to alter the terms or conditions of the contract.

B. CONTRACTOR PERSONNEL

The Contractor shall have a competent on-site representative authorized to act on their behalf, available to the CO or COR to receive instructions or information regarding on-site work under the contract. The on-site representative must be able to fluently speak and understand English. The on-site representative shall provide a phone number where they can be contacted if/when necessary.

The Contractor shall furnish adequate supervision at the premises to ensure that work is performed in a satisfactory manner. It is the responsibility of the Contractor to maintain close surveillance over personnel employed to perform work on the contract.

No unauthorized personnel are permitted on Western’s premises.

C. COMMENCEMENT, PROSECUTION, AND COMPLETION OF WORK

Work shall begin no later than 10-days from receipt of the Notice to Proceed. The Contractor shall complete the work diligently, and complete the entire contract, as specified within this PWS, within 270-days following award. The remediation portion of the work shall be completed within 120-days from the start of on-site work. Completion of the contract shall include final clean-up of the premises, as well as completion of the Remedial Completion Report, as specified within this PWS.

D. RESOURCE EXCLUSION AREA

No project-related sub-surface disturbance shall take place within an area located 25-feet on either side of the extrapolated center line of the resource exclusion area, associated with the attached sensitive area maps. The center line of the exclusion area is defined by two points; the first located on the north property line 320-feet west of the northeast corner of the site, and the second located on the east property line 400-feet south of the northeast corner of the site.

E. SUBMITTAL PROCEDURES

Provide submittals for quality control/quality assurance in accordance with the attached Submittal Log, and specified deliverables. Furnish submittals electronically (i.e. e-mail), unless otherwise specified by the COR. Send submittals to DSW-G5600-CS@wapa.gov in standard PDF or electronic CAD “*.dwg” (AutoCAD 2010) formats. Include Western's contract number, project title, transmittal/submittal number, and the corresponding item number. This list of required submittals may not be all-inclusive, and it remains the Contractor's responsibility to ensure conformance to the PWS for possible additional submittal requirements. Include a submittal cover sheet in Microsoft Word or PDF format.

mailto:DSW-G5600-CS@wapa.gov

In addition to the submittals required in the Submittal Log and deliverables, the Contractor shall submit the following information electronically to DSW-G5600-CS@wapa.gov:

Citizenship Certification Environmental Submittals Copies of Permits, etc.

Requests for Information (RFI)

All submittals regarding this project are to be sent to the above-referenced e-mail address. It should be noted that a submittal is required for any item used in the performance of this contract. Any submittal referencing a potential cost variation and/or change to the contract shall be sent to the CO, with a copy to the above e-mail.

The approval time for submittals shall be 30-calendar-days, unless specifically noted on the Submittal Log.

The Contractor is responsible for reviewing and maintaining applicable submittals as required for obtaining site closure and meeting documentation requirements.

Transmit specified non-electronic submittals to the following address:

Western Area Power Administration

ATTN: G5600

P.O. Box 6457 Phoenix, AZ 85005-5313

F. LICENSES AND PERMITS

The Contractor shall be responsible for obtaining all necessary regulatory permits, approvals, and/or waivers prior to initiation of remedial activities. The following list of agencies and associated permits may be relative to the remediation work; this list is given as a convenience only, and may not represent all permitting sources:

1. ADEQ Notice of Intent for Storm Water Discharges Associated with Remediation Activity under an Arizona Pollutant Discharge Elimination System (AZPDES) Remediation General Permit

2. Maricopa County Air Quality Department – Earth Moving/Dust Control and Asbestos/NESHAP

3. Arizona State Historic Preservation Office – Authorization to Perform Excavation

4. City of Mesa – Hauling, Demolition, and Grading and Drainage Permits

5. Arizona Department of Water Resources (ADWR) – Notice of Intent to Abandon Wells

G. SAFETY MEETINGS

On-site safety meetings will be conducted as follows:

1. Commencement of Work: Prior to beginning on-site work, a pre-job safety meeting will be conducted with the Contractor, the Sub-contractor's supervisory personnel, and Western for review of the Contractor's Safety and Health Program.

mailto:DSW-G5600-CS@wapa.gov

2. Management Safety Awareness Meeting: After commencement of work, the Contractor's management, Sub-contractor's management, and Western's management shall conduct a management safety awareness meeting, including all personnel in the work force. This meeting shall be for the purpose of demonstrating to project personnel that the Contractor and Western are totally committed to providing a safe work place.

3. Periodic Joint Safety Meetings: Periodic joint safety meetings with the Contractor's supervisory personnel and Western will be conducted throughout the contract.

H. QA/QC

The Contractor shall be responsible for demonstrating compliance with requirements of this PWS, to the satisfaction of the Government. The Contractor is required to establish and maintain QA/QC practices according to industry standards, and as required by this contract.

I. EQUIPMENT

Equipment shall be designed, manufactured, maintained, and operated as required by OSHA 1926 and OSHA 1910, and the requirements contained in this section. Equipment shall be used only for the manufacturer's intended purpose.

ROLLOVER PROTECTIVE STRUCTURES AND SEAT BELTS: Equipment defined by OSHA 1926.1000, "Rollover Protective Structures (ROPS) for Material Handling Equipment”, shall be equipped with ROPS meeting the performance requirements of OSHA 1926.1001, "Minimum Performance Criteria for Rollover Protective Structures for Designated Scrapers, Loaders, Dozers, Graders, and Crawler Tractors”. Equipment defined by OSHA 1926.602, "Material Handling Equipment”, shall be equipped with seat belts in accordance with the requirements of that section.

Riding on Equipment: Riding on equipment is prohibited unless a safe place to ride is provided. A safe place to ride is defined as a permanently affixed seat with passenger restraint device. Getting on or off equipment while in motion is prohibited.

J. ELECTRICAL MINIMUM APPROACH DISTANCE (MAD)

Equipment, conductive objects, and personnel shall not be brought closer to energized high-voltage facilities (600 V or greater) than the distances listed in the applicable parts of OSHA 1910 and 1926.

Adequate means of preventing violations of the electrical MAD shall be used, such as spotters and equipment stops.

Other equipment, conductive objects, or personnel, shall not be brought closer to energized facilities than the electrical MAD established by OSHA 1910.269(k), “Materials, Handling, and Storage”. The less stringent equipment clearance distances established by OSHA 1926.950, “General Requirements”, Table V-1, may only be used when approved in writing by the COR.

K. GROUNDS, BONDS, AND OTHER PROTECTIVE DEVICES

Electrical circuits, equipment, and conductors; and other conductive apparatus used in proximity of energized facilities shall be considered an electrical hazard to personnel, and shall be considered energized until grounded in an approved manner. No work shall be performed on energized equipment and circuits.

DEFINITIONS: The following definitions of terms apply to the protection of personnel from electrical shock:

1. Approved Ground: Approved grounds shall be as follows:

a. A station ground mat.

b. An installed structure or electrical equipment ground.

c. A 5/8-inch-diameter copperweld or galvanized rod driven or screwed to a depth of at least five-feet. If a rod cannot be installed to a depth of five-feet, install additional rods such that a total of at least five-feet of rod is buried. Bond these rods together with grounding cables of adequate size, based on maximum fault current.

d. In parallel conditions, or when energized lines are being crossed, ground rods shall be driven until the total resistance, between the grounding system and remote earth, falls below 50 ohms. If the grounding system does not result in less than 50 ohms, ground rods shall be driven until the reduction in worksite resistance is less than 10 ohms. Ground impedance shall be measured in accordance with IEEE Standard 81.

2. Hot-Stick: A hot-stick is a non-conductive tool designed, certified, and approved by the manufacturer for the installation of protective ground leads in accordance with OSHA 1926.951, "Tools and Protective Equipment". Wood hot-sticks shall not be used.

3. Protective Ground Leads: Protective ground leads (protective ground cable assemblies) are those utilized for grounding electrical apparatus and equipment. Protective ground leads shall be a minimum No. 1/0 AWG extra-flexible copper or equivalent. Some areas of work may require protective ground leads with greater current-carrying capacity than No. 1/0 AWG due to available fault current.

4. Ground leads shall be sized to handle the available fault current in accordance with ASTM Standard F855. When the fault current capability at a specific location exceeds the capacity of the standard grounding set, two (2) or more sets of grounds of the same size and approximate length shall be used. The cables shall be placed as close together as possible to minimize coupling, and a fault current capability derating factor of 0.9 shall be used for each cable.

Multiple cables shall be bound or twisted together to maximize the current carrying capacity of the cable set. Protective ground leads shall be constructed with commercial connectors installed in accordance with manufacturer's instructions.

5. Protective Ground Lead Connector: A protective ground lead connector is one designed for installation with an insulated hot-stick. A hot-stick may be an integral part of the connector, or the connector may be designed for use with a universal or utility-type hot-stick. Connectors shall be the self-cleaning clamp type and shall have a current-carrying capacity equal to the capacity of the protective ground lead.

6. Grounding: Grounding is electrically connecting a conductive object to an approved ground with a protective ground lead.

7. Drag-Chain Ground Lead: A drag-chain ground lead is a steel, or steel alloy, chain securely bolted to the chassis of rubber tired mobile equipment. Chain shall have links at least one-inch-in-length, and the overall chain length shall be sufficient to provide one-foot of ground contact when the equipment is not moving. A drag chain is allowable only when no other ground lead is feasible and equipment grounding is required.

L. DAMAGE TO PROPERTY

The Contractor is liable for damage to both the Government and private property in performance of this contract. The Contractor shall pay for damages where the damage is the fault or negligence of the Contractor, as determined by the CO.

SECTION 3 – WORK REQUIREMENTS

A. PROJECT OBJECTIVE

The objective of this contract is to achieve VRP site closure for Mesa Substation through the performance of environmental remediation requirements presented in this PWS, and implementation of the attached approved VRPRW. This process will also include the provision of an approved Remedial Completion Report.

B. SCOPE OF WORK

The Contractor shall perform all work, including provision of all necessary labor, equipment, and materials, to meet the project objective. The following items outline the scope of work:

Perform pre-field activities addressing health and safety, community relations, and obtaining any required permits and approvals as applicable.

Perform monitoring, sampling, and documentation services for remediation, abatement, and disposal of the following material types:

− Piping, sump, and floor drain liquids associated with an electrical substation control building.

− Oil piping, sumps, and floor drain collection systems, including residual liquids, associated with demolition of an electrical substation control building.

− Excavated soil materials, from demolition of piping systems, building, and contaminated areas within the former substation yard.

− Earth backfill materials – on-site and imported.

− Septic system, including discharge lines, tank, and leach field.

If on-site examination discovers additional contamination, the Contractor shall perform monitoring, sampling, and documentation services for remediation, abatement, and disposal of the following material types:

− Material from concrete demolition.

− ACM, including oil and water piping, and electrical conduit.

− Control Building materials and electrical panels.

Perform a preliminary risk evaluation of arsenic in subsurface soils.

Prepare a Remedial Completion Report documenting the above-identified activities for the COR’s review and approval upon completion of on-site work.

Provide Work Schedule to COR for review and approval prior to commencing on-site work.

Obtain required permits/approvals.

Excavate and dispose of contaminated surficial soils.

Abate ACM inside the control building.

Abate ACM oil and water piping, as well as electrical cables and conduit.

Collect and dispose of residual liquids associated with piping, sumps, and floor drains.

Perform demolition of the control building and basement, to include condenser and oil processing rooms.

Perform demolition of concrete pads, structures, and cable trenches.

Abandon the existing well at the site.

Backfill all excavated areas.

Perform final site grading.

Prepare a Community Involvement Plan prior to commencing work on-site.

Prepare a Remedial Completion Report upon completion of on-site work.

In addition, the Contractor shall gauge and verify compliance with the various governmental standards for remediation and the requirements of this PWS.

Order of Work The remediation work generally consists of excavation, disposal, and backfill of contaminated soils, building demolition, demolition of concrete structures and cable trench, demolition of water and oil piping, and well abandonment.

The remediation work is proposed to be performed in the order presented in this PWS. Co-ordinate work and resource requirements with the COR in order to maintain uninterrupted progress.

1. Health and Safety Requirements

COMPLIANCE WITH CODES AND STANDARDS: Comply with the latest effective Occupational Safety and Health Administration (OSHA) Standards 29 CFR 1910 and 29 CFR 1926, and other applicable Federal, State, and local regulations. In any State where the State OSHA's regulations are accepted by the Federal Government, comply with the State OSHA regulations.

Keep a copy of applicable OSHA Standards at the jobsite. Certain OSHA Standards have been referenced for emphasis. OSHA Standards shall apply, whether referenced or not.

a) Failure to Comply: Failure to comply with the Contractor’s Health and Safety Program and the PWS may result in the suspension of work. Should this occur, a replacement shall be provided to enable the continuation of on-site work.

b) Accident Records and Reporting: Maintain and furnish accurate records and reports, as directed by the COR. Verbal notifications are required immediately, and written reports are required within 48-hours on job-related deaths, occupational diseases, traumatic injuries to employees or the public, and property damage caused by an accident, as follows:

(1) Personal Injury/Illness:

i. Job-Related Injuries and Illnesses: Job-related injuries and illnesses to the Contractor or Sub-contractor employees shall be reported to the COR immediately.

Injuries/illnesses shall be posted to the OSHA 300 Log and OSHA Form 301, and shall be available for review by the COR.

ii. Public Injury: Injuries to the public arising out of this contract shall be reported to the COR immediately.

(2) Equipment and Motor Vehicle Accidents: Work site equipment and motor vehicle accidents, regardless of extent of injury or cost, shall be reported to the COR immediately.

(3) Property Damage: Property damage or loss in excess of $1,000 resulting from any accident shall be reported to the COR immediately. Damage to Government or public property, regardless of cost, shall also be reported to the COR immediately.

(4) Provide this cost in the Mobilization and Demobilization CLIN.

2. Proposal Schedule Item “Community Involvement Plan” includes the following:

a. The Contractor shall be responsible for all aspects of compliance with regulatory requirements for public notices.

b. The Contractor shall be responsible for providing the approved language for the project signs and notifications to the COR, including those notices posted at the project site, or transmitted via media. As a condition of site closure, the Contractor shall provide and issue a public notice, as required by ADEQ.

Submit one electronic copy of the Community Involvement Plan to the COR for review and approval no later than 30-days after contract award.

The Contractor shall implement the Community Involvement Plan. Any signage requirements are to be submitted for approval to the COR prior to placement on-site.

3. Proposed Schedule Item “Mobilization and Demobilization” includes, but is not limited to, all activities necessary to prepare for the remediation work, some of which are:

a. Deliver portable toilets.

b. Provide water for all required activities. No water is available on-site.

c. Establish temporary on-site electrical service and lighting, as needed.

d. Establish on-site haul route to prevent trucks from driving over contaminated soils.

e. Minimize off-site tire tracking by providing/maintaining a “Track-out Control Device” in accordance with Section 306 of Maricopa County Rule 310 – Fugitive Dust from Dust- Generating Operations.

f. Delineate site safety zones.

g. Provide Safety and health Plan

h. Provide health and safety equipment.

i. Mobilize necessary equipment.

j. Locate underground utilities.

4. Proposal Schedule Item “Contaminated Surficial Soil Excavation, Confirmation, Monitoring, and Sampling” includes all labor, materials, and equipment necessary to provide monitoring of soil remediation, materials disposal, and associated confirmation sampling and analysis.

a. General Soil Remediation Requirements:

The Contractor shall be responsible for waste characterization and profiling. These functions shall be performed prior to any off-site disposal. Existing analytical data may be used for waste characterization.

Sample and analyze excavated soils and provide confirmation for suitability as uncontaminated backfill material, or confirm the requirement for removal and disposal by the Contractor. Sample and analyze proposed sources of imported soil backfill, if insufficient source data is available. Collect one sample per every 100-cubic-yards (loose measure) and analyze according to this section.

Prior to excavation, the Contractor shall submit the proposed Subtitle D landfill selected to receive the excavated soils for approval by the COR.

Loads shall be manifested, with Western identified as the generator. Manifests must be signed by Western’s designated on-site Environmental Representative prior to haul trucks egressing from the site. Loads/manifests must be recorded on waste tracking sheets, and placed in a database for tracking purposes. Disposal receipts obtained from the disposal facility shall be cross-referenced with the database to confirm that each load has been properly disposed. It should be noted that the Contractor shall provide the COR with a minimum of 48-hours’ notice prior to the haul trucks egressing from the site.

The Contractor shall monitor dust levels during excavation using a MINIRAM (Miniature Real- Time Aerosol Monitor) and visual observation. Notify the COR if dust exceeds opacity levels.

b. Soil Confirmation Sampling:

QA/QC to evaluate the field and laboratory data: the quality of the data must be sufficient to allow for proper evaluation of environmental conditions related to this site. Soil confirmation sampling shall be performed in accordance with the quality assurance requirements. Collect soil confirmation samples from the base of excavated areas using a decontaminated stainless steel soil sample scoop. Collect six samples per DU at approximate locations where Geo-probe sampling was performed (refer to the attached VRPRW). The sample depth shall extend no greater than six-inches.

Samples shall be transferred directly from the sample scoop to an eight-ounce glass jar, labeled and sealed.

De-contaminate sample scoops locations: decontamination shall consist of a wash with Alcon-ox and potable water, a potable water rinse, a ten-percent nitric acid rinse, and a final distilled water rinse. De-contaminated equipment shall be air-dried.

Labeled and filled laboratory containers shall be immediately placed in a cooler on ice:

complete the chain-of-custody form and other applicable documentation. Chain-of-custody procedures shall be followed, as documented on the form.

Analyze samples from specific DU’s as follows, using a three-day laboratory turnaround time:

(1) DU-7: PCB (EPA Method 8082)

(2) DU-8 and 18: PAH (EPA Method 8310)

(3) DU-13 and 14: PCB and PAH

(4) DU-16: Chlorinated pesticides (EPA Method 8081A)

(5) DU-15: PCB, PAH, and chlorinated pesticides

In the event that any detected constituent in a confirmation sample exceeds its residential SRL, contact the COR immediately.

5. Proposed Schedule Item “Control Building Asbestos-Containing Material Abatement” includes details of the abatement, removal, and disposal of identified Category II ACM prior to demolition or recycling. All ACM was identified in the control building; no ACM was identified in the Warehouse.

The following ACM shall be subject to abatement:

a. Window Putty: Frames around seven windows; estimated at 20-square-feet.

b. Caulking: Seams between metal wall panels; estimated at 225-square-feet.

c. Caulking: Interior stairwell on railing and near bathroom entry; estimated at five-square-feet.

d. Concrete Pipe: Basement, south wall condenser room and east side exterior concrete slab.

e. Electrical Panel Wiring: Wiring in control building electrical panels.

f. Caulking and Paint: East side exterior concrete lids, seams, penetration; estimated at 35-square-feet.

g. Asbestos Abatement – Control Building:

(1) Take air clearance samples during asbestos abatement located in the existing control building.

(2) Inspect work areas and procedures for conformance with the requirements of the

Contractor’s HASP, this PWS, and applicable regulatory requirements.

(3) Confirm that hygienic and safe work practices are followed; report any inconsistencies to the COR. Document any non-compliance issues and the subsequent resolution of such issues.

(4) Perform sampling and analysis in the event ACM not included in the project are suspected; provide the extent of discovered ACM, and recommendations for abatement methods to the COR.

(5) Provide results of all testing as part of the Remedial Completion Report.

The scope of work for abatement and removal of ACM at this site is summarized in the following paragraphs; additional ACM abatement procedural requirements are included in the VRPRW.

6. Proposed Schedule Item “Contaminated Soils Excavation and Disposal” includes the waste characterization/profiling prior to any off-site disposal; the Contractor shall not commence disposal operations until waste characterization/profiling has been performed, and clearance for disposal has been issued by the Contractor with concurrence from the COR. Existing analytical data may be used for waste characterization. (Refer to the VRPRW.)

The Contractor shall utilize appropriate equipment for excavating soils to the identified depths, including shoring for excavation protection as required by applicable OSHA standards. Haul trucks used to transport excavated soil off-site shall be limited to driving on uncontaminated areas within DUs (2-6 and 9-12). Excavated soils shall be transported to a Subtitle D landfill identified by the Contractor, and approved by the COR. The haul trucks shall have tarps or mechanical enclosures to prevent the loss of excavated soils during transport. Loads must be manifested, with Western identified as the generator, and a Western Environmental Representative must be on-site to sign manifests prior to haul trucks egressing from the site. A minimum of 48-hours’ notice shall be given to the COR, in order to enable an Environmental Representative to be present to sign the manifest. Loads and manifests must be recorded on waste tracking sheets and submitted to the COR for recording and tracking.

The Contractor is responsible for implementing and monitoring the dust control requirements during excavation, as detailed in the Dust Control Plan. Water shall be used for dust suppression; alternate dust suppression methods require prior approval from the COR.

7. Proposed Schedule Item “Concrete Pad and Cable Trench Demolition” includes the demolition, removal, and recycle or disposal of the two large concrete pads associated with the two on-site buildings, and an estimated 850-linear-feet of concrete cable trenches, with metal cover plates (refer to the drawings). Excavated areas resulting from demolition and removal shall be backfilled with clean soil.

The concrete cable trenches measure approximately five-feet-wide by five-feet-deep, but vary in size. The pad associated with the warehouse is at grade, while the pad associated with the control building is elevated.

Demolition of these structures shall commence at the completion of oil piping demolition.

Previous concrete testing at the site did not detect any contaminants; the demolished concrete may be disposed or recycled at a construction debris landfill; the metal plates may be recycled.

As a reminder, all recycled and/or recovered material must be accounted for at the end of the project, prior to final payment being issued.

8. Proposed Schedule Item “Rock Mulch” includes compaction of disturbed surface; the eradication of grass, weeds, and undesirable vegetation; application of an approved herbicide;

furnish and place rock mulch material, including material applied in excess of the specified thickness; and any erosion repair work.

a) MATERIAL: Rock mulch shall be free of calcareous coating, caliche, organic matter, or other foreign substances.

b) PLACING: Disturbed surfaces upon which the rock mulch is to be placed shall be compacted to 90% of the maximum density, in accordance with ASTM D698. Perform one successful test for every 100-cubic-yards, or fraction thereof. All deleterious material shall be removed and disposed of by the Contractor. Prior to placing rock mulch, the pre-emergent herbicide, submitted and approved by the COR, shall be applied in accordance with the manufacturer's instructions. The application areas shall be totally free of grasses, weeds, and undesirable vegetation. All dead grass and weeds shall be removed and disposed of by the Contractor.

The rock mulch shall be placed in an even application, tightly packed, to provide complete coverage of the entire work site so that soil will not be visible between rocks. After placing and grading the rock mulch, the Contractor shall water the mulch with a light spray to remove fine material from the surface.

Any re-grading that is necessary after placement of the rock mulch shall be at no additional cost to Western. Rock mulch placed shall be at least three-inches-deep.

Rock mulch shall be in accordance with the following gradation chart:

Rock Mulch Gradation

Sieve Size (in) Passing (%) 3 100 2 50 - 75 1 10 - 20

Prior to placing rock mulch, the Contractor shall certify material gradation with test data representing the rock mulch to be used.

9. Proposed Schedule Item “Concrete Structure Demolition” includes the removal of the concrete structures located in the former substation yard (refer to the drawings); these foundations shall be removed prior to excavation of contaminated soils. Previous concrete testing at the site did not detect any contaminants (PCB, lead, asbestos) requiring special disposal practices. Thus, the concrete structures are considered non-hazardous, and may be disposed at a construction debris landfill or recycled.

10. Proposed Schedule Item “Building Demolition” includes the following:

a. Control Building and Warehouse:

Construction details for each building are included in Section 3 of the VRPRW. Demolition work shall be conducted according to the following procedures:

1) Metals shall be segregated and recycled where possible.

2) Dust suppression during demolition is mandatory.

3) Demolish and remove the above-grade walls and roofing. After removal of above-grade features, demolish and remove the control building basement and foundations.

4) Demolition debris may be disposed of as construction debris. Haul trucks shall have tarps or mechanical enclosures to prevent the loss of debris during transport.

5) Additional sampling and testing, to be conducted by the Contractor, may be necessary in areas associated with removal of the sumps and floor drains. Additional remediation efforts may be required, at the direction of the COR, to remove contaminated materials.

6) Place backfill in the excavated basement demolition area to match the surrounding grade.

11. Proposed Schedule Item “Piping and Sump/Floor Drain Liquids Collection and Disposal” includes the following:

a. The Contractor is required to locate, excavate, and dispose of sumps, floor drains, and piping associated with the control building.

1. After building demolition, perform utility locating to identify piping and potential discharge locations of the floor drains and sumps. The Contractor is to determine sampling locations beneath the removed sumps and floor drains at discharge points, at ten-foot intervals along linear pipe runs and at elbows.

2. Following characterization of the sump/floor drains, the Contractor shall excavate contaminated soils, and pump out any liquids found within and below the sumps and floor drains and along associated piping. Removal shall proceed to the extent that no further contamination exists, and is verified as such by the Contractor. After removal of contaminated materials, place backfill behind excavated areas.

12. Proposed Schedule Item “Backfilling and Site Grading” includes backfilling excavated areas with clean fill (as referenced in the VRPRW). The fill material shall be placed and compacted as presented below. The final grade shall match the existing grades, and the areas included in the remediation work shall be graded to prevent ponding from storm run-off.

Backfilling is required at the following locations:

a. Areas excavated for removal of contaminated soil.

b. Trenches resulting from removing oil and water piping.

c. Trenches resulting from cable trench demolition.

d. Areas excavated as part of the demolition of the control building basement and warehouse.

Excavated material associated with piping removal may be used as fill material, provided that testing performed by the Contractor indicates that this material is uncontaminated.

(1) IMPORTED BACKFILL: In the case of a commercial backfill source, the Contractor shall provide to the COR, prior to delivery to the site, certification that the backfill material meets standards for uncontaminated fill. If sufficient backfill source documentation is not available, the Contractor shall be responsible for analysis of the backfill material; shall review the analytical results, and provide a recommendation of rejection or acceptance of the material, to the COR. Off-site sources of imported backfill material shall receive final approval from the

COR.

If analysis of off-site soil is required, a minimum of one sample shall be collected for every 100-cubic-yards, or fraction thereof, and shall be analyzed for PAH, PCB, eight RCRA metals, chlorinated pesticides, and VOC; contaminant levels shall not exceed residential SRL. The Contractor shall be responsible for performing analysis to determine the engineering properties and suitability of backfill materials, and shall conduct field analysis according to the VRPRW to indicate attainment of backfill moisture content and density requirements.

Imported fill material shall consist of clean mineral soil, certified as uncontaminated by the Contractor, and shall meet the following criteria.

(2) COMPACTING EARTH MATERIAL GENERAL: Where compacting earth material is required, material shall be deposited in horizontal layers, and compacted to 95% maximum density. Submit the following to the COR for approval:

(a) Name and qualifications of a testing laboratory at least 20-calendar-days prior to start of compaction operations. The testing laboratory shall meet the requirements of ASTM D 3740.

(b) Compaction test reports immediately after completion. Reports shall specify the location by elevation and horizontal co-ordinates for each test taken.

Excavating, placing, moistening, and compacting operations shall result in material being uniformly compacted throughout the required section, and homogeneous, free of lenses, pockets, streaks, or laminations.

(3) TESTING: Perform a minimum of one successful test for every 1,000-cubic-yards, or fraction thereof, of backfill. Material samples for testing shall be obtained from locations as determined by the COR. A successful test shall show that the material has been compacted to the specified density and moisture. If a test is not successful, the Contractor shall perform additional tests and additional work, as required in order to ensure that the specified density and moisture are achieved

(4) PLACING: Manner of depositing backfill material shall be approved by the COR. Stripped material shall not be used for backfill.

General Fill Requirements:

(1) GENERAL: Place and compact backfill for removed foundations, utility trenches, and other work requiring backfill.

(2) MATERIAL: Obtain backfill material from required excavations. If sufficient suitable material is not available from required excavations, obtain additional material from off-site commercial borrow areas.

(3) PLACING MATERIAL:

a) GENERAL: Where compacting earth material is required, material shall be deposited in horizontal layers and compacted as specified.

b) Excavating, placing, moistening, and compacting operations shall result in material being uniformly compacted throughout the required section and homogeneous, free of lenses, pockets, streaks, or laminations.

(4) COMPACTING CLAYEY AND SILTY MATERIAL:

a) General: Thickness of horizontal layers after compaction shall not be more than six-inches.

b) Excavating and placing operations shall result in material, when compacted, being blended sufficiently to secure the highest practicable density, impermeability, and shear strength.

c) Moisture Content: Prior to, and during, compacting operations, material shall have a moisture content within plus or minus 2% points of optimum moisture. Moisture content shall be uniform throughout each layer. If the moisture content is not within 2% points of optimum, the compacting operations shall not proceed, except with the specific approval of the COR, until the material has been wetted or allowed to dry to obtain optimum moisture content within the tolerances. No adjustment in price will be made on account of wetting or drying the material, or on account of delays occasioned thereby.

d) Compaction: When the material has been conditioned, it shall be compacted by rollers or by hand or power tampers. Where hand or power tampers are used in confined areas, they shall be equipped with suitably shaped heads to obtain the required density.

e) Soil Density: The density (dry) of the soil fraction in the compacted material shall not be less than 95% of the laboratory standard maximum soil density (dry), as determined by ASTM D 698, Method A, compaction test for the material being compacted. The standard maximum soil density is the dry weight per-cubic-foot of the soil compacted at optimum moisture content by laboratory procedure.

(5) COMPACTING COHESIONLESS MATERIAL:

a) General: Thickness of horizontal layers after compaction shall not be more than six-inches if compaction is by tampers or rollers; not more than 12-inches if compaction is by treads of crawler-type tractors, surface vibrators, or similar equipment; and not more than the penetrating depth of the vibrator if compaction is by internal vibrators. Water shall be added, as required, to obtain the specified density.

b) Relative Density: Relative density of the compacted material shall not be less than 70%, as determined by ASTM D 4253 and ASTM D 4254.

13. Proposal Schedule Item “Oil Piping Demolition, Confirmation, Monitoring, and Sampling” includes performing confirmation sampling associated with removal and demolition of approximately 1,600-linear-feet of existing oil piping within the unpaved areas, according to the following procedures:

a. Collect soil samples beneath the piping within four-hours of removal; collect samples using a clean stainless steel soil sample scoop. Collect soil samples at 10-linear-foot intervals and from beneath elbows. Identify sample locations on a site plan. Analyze soil samples for PAH and PCB in accordance with EPA Methods 8310 and 8082.

b. Monitor for the presence of volatile organic vapors using a calibrated portable photoionization detector during excavation of underground piping.

c. After exposure of the underground piping system, inspect the system with the COR;

document the presence of any subsurface contaminated soils, based on field observations, which may have been present prior to piping exposure.

d. Sample and analyze residual oil contained in the piping to determine the necessary disposal method, and furnish the COR with the results.

e. Observe excavation and removal operations, perform confirmation soil sampling, and photograph conditions prior to backfilling. Collect one sample per every 100-cubic-yards (loose measure) and analyze according to the soil confirmation sampling requirements given in No. 4 above, “Contaminated Surficial Soil Excavation/Disposal/Confirmation Sampling”.

Analyze excavated soils and provide confirmation to the COR for suitability as uncontaminated backfill material. If the soil requires removal, the COR shall notify the Contractor.

f. Confirm that recovered fluids are disposed of in accordance with TSCA PCB Regulations (40 CFR Part 761).

g. Provide documentation of all analytical results and disposal as part of the Remedial

Completion Report. Provide documentation of any issues, such as spills, and their subsequent resolution.

14. Proposed Schedule Item “ACM Oil Piping and Electrical Conduit Abatement, and Steel Water Piping” includes the performance of all oil piping and electrical conduit abatement in co-ordination with the COR, and after contaminated surficial soil excavation and off-site disposal of contaminated soils has been completed.

15. Proposal Schedule Item “Sump and Floor Drain Confirmation, Monitoring, and Sampling” includes the following:

b. Perform sampling of residual fluids contained within the piping to determine disposal requirements; furnish results of such testing to the COR. Confirm that recovered fluids are disposed of in accordance with TSCA PCB regulations (40 CFR Part 761).

c. Perform soil sampling using a clean stainless steel soil sample scoop beneath the removed sumps and floor drains, at potential discharge locations, at 10-linear-foot piping intervals, and from beneath elbows.

d. Provide analytical results and disposal documentation as part of the Remedial Completion

Report. Provide documentation of any issues, such as spills, and their subsequent resolution.

16. Proposed Schedule Item “Well Abandonment” includes the performance of well abandonment at an out-of-service groundwater production well, according to applicable ADWR requirements, upon receipt of authorization from ADWR. The well, including turbine pump, concrete footing, and aboveground piping, is located at the northern edge of the site; well details are provided in drawings. Based on the known well installation, it is assumed that the well penetrates multiple aquifers, and that no water quality contamination issues exist.

The well is located beneath a high-voltage Salt River Project (SRP) power line; the Contractor is required to co-ordinate with SRP to determine the requirements for well abandonment. The Contractor is responsible for coordinating any required outage, Hot Line Order (HLO), or permitting with SRP that may be necessary to ensure continued electrical service, and to protect workers at the project site. The Contractor is also required to pay any fees associated with requesting the outage, HLO, or permitting with SRP.

The Contractor shall ensure that all applicable safety measures are in place to protect workers from electrical hazards associated with working in proximity to the line.

Actual requirements imposed by ADWR may vary, but the anticipated scope of work consists of abandoning the well in-place in accordance with ADWR Alternative No. 5, to include removal of the upper five-feet of casing, and sealing of the well without the use of a tremie pipe, in accordance with ADWR abandonment criteria. The Contractor is required to file a Notice of Intent with ADWR; a variance due to the overhead power line may apply.

After removal, the COR shall inspect the pump area for cultural or archaeological resource discoveries.

17. Proposed Schedule Item “Septic System Removal” includes the removal of an abandon four-foot by seven-foot by six-foot septic tank sequentially, as follows:

a. Excavate to expose the septic system. The Contractor shall be responsible for monitoring the presence of volatile organic vapors during excavation, and determining whether excavated soils are suitable for backfill.

b. Place uncontaminated soil adjacent to trenches for subsequent backfill. Based on the sub-surface investigation performed at the site, it is assumed that contaminated soils will not be encountered.

c. Inspect excavations to determine the presence of any sub-surface contaminated soils revealed by exposure of the septic tank. After field observation, if sampling is required, the Contractor will collect and analyze samples for subject parameters.

d. Upon completion of the inspection, if any sewage remains inside tank, it shall be pumped out by a licensed liquid waste hauler. Remove septic tank and any remaining piping associated with septic tank.

e. The Contractor shall be responsible for any spillage or leakage to the ground surface resulting from septic tank removal.

f. Dispose of the septic system in accordance with the applicable contract requirements and regulations. Provide documentation of the septic tank, piping materials, captured sewage, and contaminated soil disposal to the COR. Facilitate soil sampling within four-hours of septic tank removal. Collect and analyze samples.

g. Remediate any additional contaminated areas uncovered by removal of the septic tank, as indicated through sampling and testing. Backfill excavated area with clean fill.

18. Proposal Schedule Item “Septic System Confirmation, Monitoring, and Sampling” includes all labor, materials, and equipment necessary to provide monitoring of the septic tank, leach fields, discharge lines, etc., necessary to provide monitoring of soil remediation, materials disposal, asbestos abatement, and associated confirmation sampling and analysis.

a. Collect soil samples beneath the septic system within four-hours of removal; collect samples using a clean stainless steel soil sample scoop. Collect soil samples at 10-linear-foot intervals and from beneath elbows. Identify sample locations on a site plan. Analyze soil samples for PAH and PCB in accordance with EPA Methods 8310 and 8082.

b. Monitor for the presence of volatile organic vapors using a calibrated portable photoionization detector during excavation of underground piping.

c. After exposure of the septic system, inspect the system with the COR; document the presence of any subsurface contaminated soils, based on field observations, which may have been present prior to piping exposure.

d. Observe excavation and removal operations, perform confirmation soil sampling, and photograph conditions prior to backfilling. Collect one sample per every 100-cubic-yards (loose measure) and analyze according to the soil confirmation sampling requirements given in No. 4 above, “Contaminated Surficial Soil Excavation/Disposal/Confirmation Sampling”.

Analyze excavated soils and provide confirmation to the COR for suitability as uncontaminated backfill material. If the soil requires removal, the COR shall notify the Contractor.

e. Provide documentation of all analytical results and disposal as part of the Remedial

Completion Report. Provide documentation of any issues, such as spills, and their subsequent resolution.

19. Proposal Schedule Item “Remedial Completion Report” includes the following:

Prepare the Remedial Completion Report upon completion of on-site work.