Att_11.9_UFGS_02_61_13.pdf

Shallow Land Disposal Area (SLDA) SOW

Section 02 61 13 Page 1

SECTION 02 61 13

EXCAVATION AND HANDLING OF CONTAMINATED MATERIAL

02/10

PART 1 GENERAL

1.1 MEASUREMENT AND PAYMENT

1.1.1 Measurement

Measurement for excavation and onsite transportation shall be based on the actual number of cubic yards of contaminated material in‐place prior to excavation. Determination of the volume of contaminated material excavated shall be based on cross‐sectional volume determination reflecting the differential between the original elevations of the top of the contaminated material and the final elevations after removal of the contaminated material. Measurement for backfilling of excavated areas shall be based on in‐place cubic yards of compacted fill. Measurement for construction of stockpile areas shall be based on the number of square yards of stockpile liner constructed.

1.1.2 Payment

1.1.2.1 Excavation and Transportation

Compensation for excavation and onsite transportation of contaminated material will be paid as a unit cost. This unit cost shall include any other items incidental to excavation and handling not defined as having a specific unit cost.

1.1.2.2 Backfilling

Compensation for backfill soil, transportation of backfill, backfill soil conditioning, backfilling, compaction, and geotechnical testing will be paid as a single unit cost.

1.1.2.3 Stockpiling

Compensation for construction of stockpile areas will be paid for as a unit cost. This unit cost shall include all aspects of grading, preparation, handling, placement, maintenance, removal, treatment, and disposal of stockpile cover materials and liner materials and all other items incidental to construction of stockpiles.

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.

Section 02 61 13 Page 2

ASTM INTERNATIONAL (ASTM)

ASTM D1556 (2007) Density and Unit Weight of Soil in Place by the Sand‐ Cone Method

ASTM D1557 (2012) Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft‐ lbf/ft3) (2700 kN‐m/m3)

ASTM D2167 (2008) Density and Unit Weight of Soil in Place by the Rubber Balloon Method

ASTM D2487 (2011) Soils for Engineering Purposes (Unified Soil Classification System)

ASTM D422 (1963; R 2007) Particle‐Size Analysis of Soils

ASTM D5434 (2012) Field Logging of Subsurface Explorations of Soil and Rock

ASTM D6938 (2010) Standard Test Method for In‐Place Density and Water Content of Soil and Soil‐Aggregate by Nuclear Methods (Shallow Depth)

ASTM D698 (2012) Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft‐lbf/cu. ft. (600 kN‐m/cu. m.))

U.S. ARMY CORPS OF ENGINEERS (USACE)

EM 385‐1‐1 (2008; Errata 1‐2010; Changes 1‐3 2010; Changes 4‐6 2011;

Change 7 2012) Safety and Health Requirements Manual

1.3 DESCRIPTION OF WORK

1.3.1

The work consists of excavation and temporary stockpiling of FUSRAP‐contaminated soils / fill to the approximate limits shown on Figures 3 and 4 provided in the SOW. Analytical data is summarized in SOW Attachment 3. Subsurface conditions are described in the SOW and on boring logs provided in SOW Attachment 2. Submit work plans as specified below. Backfill material maybe available onsite (as place‐back soils) and clean offsite fill will also be required. Groundwater occurs at approximately 0 to 18 feet below the pre‐excavation ground surface. Required sampling and chemical analysis shall be conducted in accordance with the Government‐approved SAP and Sections 01 35 45.00 20.

1.3.2 Scheduling

Notify the Contracting Officer 5 calendar days prior to the start of excavation of contaminated soils / fill.

The Contracting Officer will be responsible for contacting regulatory agencies.

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1.3.3 Work Plans

Submit work plans as listed below. No work shall be performed at the site until all work plans are accepted by the Government. Allow 30 calendar days in the schedule for the Government's review of each work plan version (Preliminary Draft, Draft, and Final) and 30 calendar days for the Contractor to prepare responses to the comments, revise each document, and Government back check. . No adjustment for time or money will be made if resubmittals of the work plans are required due to deficiencies in the plans.

The following work plans shall be prepared for Government review and acceptance/approval:

a. Site Operations Plan (SOP)

b. Accident Prevention Plan (APP)/Site Safety and Health Plan (SSHP)/)/Chronic Beryllium Disease

Prevention Program (CBDPP)/Radiation Protection Plan (RPP)

c. Contractor Quality Control Plan (CQCP)

d. Sampling and Analysis Plan (SAP)

e. Regulatory Compliance Plan (RCP)

f. Perimeter Air Monitoring Plan (PAMP)

g. Water Management Plan (WMP)

h. Waste Management, Transportation, and Disposal Plan (WMTDP)

i. Final Status Survey Plan (FSSP)

j. Contamination Control Plan (CCP)

k. Backfill and Restoration Plan (BRP)

l. Engineering Survey (Optional)

m. Demolition Plan (Optional)

Requirements for each plan are provided in the SOW.

1.3.3 Other Submittal Requirements

Submit civil survey drawings of each area before and after excavation and after backfilling.

Submit radiological and chemical test results from the excavated areas associated with remediation compliance sampling.

Submit radiological, chemical, and geotechnical test results of excavated soils/ fill prior to transportation and off‐site disposal.

Submit radiological, chemical, and geotechnical test results of place‐back soils or off‐site fill prior to backfilling or receipt at the site.

Submit radiological and chemical test results of soils taken from beneath contaminated material handling areas.

Provide a Project Completion Report at the conclusion of site remediation activities.

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1.4 SUBMITTALS

Government approval is required for submittals with a "G" designation; submittals not having a "G" designation are for Contractor Quality Control approval. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00:

SD‐02 Drawings

Civil Surveys [G]

SD‐03 Product Data

Work Plans [G] Project Completion Report [G]

SD‐06 Test Reports (Sampling and Analytical Results)

Off‐Site Fill [G] Remediation Compliance Activities [G] Stockpiled Excavated Material [G] Stockpile Areas, Temporary Haul Roads, Other Areas Required by the Government [G] Compaction [G]

1.5 REGULATORY REQUIREMENTS

1.5.1 Air Emissions

Air emissions shall be monitored and controlled in accordance with the Government‐approved PAMP.

1.5.2 Water Discharges

Site water shall be controlled, monitored, treated (if necessary), and discharged in accordance with the Government‐approved WATER MANAGEMENT PLAN and Section 01 57 23.

1.5.3 Soil Backfill

Regulatory requirements for backfill are identified in paragraph BACKFILL.

PART 2 PRODUCTS

2.1 SPILL RESPONSE MATERIALS

Provide appropriate spill response materials including, but not limited to the following: containers, adsorbents, shovels, and personal protective equipment. Spill response materials shall be available at all times when contaminated materials, contaminated wastes, fuels, and hazardous substances are being handled or transported. Spill response materials shall be compatible with the type of materials and contaminants being handled.

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2.2 BACKFILL

Backfill material shall consist of onsite place‐back soils identified in paragraph Place‐Back Soils and off‐ site general fill identified in paragraph Imported General Fill and Topsoil.

2.2.1 Place‐Back Soils

Excavated soils that do not contain FUSRAP contaminants and chemical contaminants above the cleanup goals / criteria can be used as place‐back soils if the soils are free from roots and other organic matter, trash, debris, snow, ice, frozen materials, or any other undesirable materials as determined by the USACE. Slag and recycled concrete, asphalt, man‐made fills, trash, refuse or any other recycled material will not be accepted.

The Contractor shall propose a methodology for determining the volume of place‐back soils used in the Site Operations Plan.

2.2.2 Imported General Fill and Topsoil

Imported general fill and topsoil shall be obtained from offsite sources approved by the Contracting Officer. Do not use imported general fill and topsoil for backfill until soil test results have been accepted by the Government.

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PART 3 EXECUTION

3.1 SURVEYS

Surveys shall be performed immediately prior to, weekly, and after excavation of contaminated material to determine the volume of contaminated material removed. Surveys shall also be performed immediately after placement and compaction of backfill in each excavation and upon completion of all site work (final site grades). The locations of confirmation samples (Final Status Survey Plan sampling and sampling associated with temporary haul roads, stockpile areas, and other) shall also be surveyed and shown on drawings. Surveys shall be performed in accordance with the SOW and Section 01 22

00.00 10 and provided as a weekly submittal.

3.2 EXISTING STRUCTURES AND UTILITIES

No excavation shall be performed until site structures and utilities have been field located. Take the necessary precautions to ensure that no damage occurs to existing structures and utilities. Damage to existing structures and utilities resulting from the Contractor's operations shall be repaired at no additional cost to the Government. Utilities encountered that were not previously shown or otherwise located shall not be disturbed without approval from the Contracting Officer.

3.3 CLEARING AND GRUBBING

Clearing and grubbing shall be performed in accordance with Section 31 11 00.

3.4 CONTAMINATED MATERIAL REMOVAL

3.4.1 Excavation

3.4.1.1 Areas

FUSRAP‐contaminated soils / fill shall be removed from the following areas that are discussed and illustrated in the SOW Figure 1.

3.4.1.2 General Requirements

The Contractor shall post warning signs, secure the work area(s), and allow only authorized personnel access to the work area(s). The Contractor shall furnish, install and maintain temporary fencing around the work areas. The temporary fencing shall be at least 4 ft high, plastic /metal/ wood construction, with high‐visibility flagging installed at minimum 6 ft intervals.

Health physics technical support shall be provided on‐site at all times, commencing with mobilization activities, to ensure worker safety and proper disposition of waste streams. The technician(s) shall provide continuous monitoring of all wastes for possible radioactive contamination.

The KO / COR shall be provided with an excavation schedule and five day advanced notice prior to beginning an excavation or moving to a new excavation location. KO / COR approval must be obtained prior to excavating any area.

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The Contractor shall notify the KO / COR within 48 hours, and before excavation, if contaminated material is discovered that has not been previously identified or if other discrepancies between data provided and actual field conditions are discovered.

Sampling and analysis shall be conducted in accordance with the Government‐approved Final Status Survey Plan.

After completion of each excavation, the Contractor shall perform Final Status Survey Plan closeout activities. The Contractor shall keep the excavated area as dry as possible and shall maintain the excavated area in a condition that is safe for workers. Once closeout activities are completed by all parties and no additional material is targeted for removal, the excavation shall be surveyed and backfilled with approved offsite fill, pace‐back soils, and topsoil from an off‐site source.

3.4.1.3 Existing Structures and Utilities

Excavation shall not occur until site utilities have been located in the field. Utilities encountered that were not previously shown or otherwise located shall not be disturbed without approval from the KO /

COR.

Necessary precautions shall be taken to ensure that no damage occurs to existing structures. Damage to existing structures resulting from the Contractor's operations shall be repaired at no additional cost to the Government.

3.4.1.4 Excavation Limits

Areas of FUSRAP contamination shall be excavated to the extents shown in the SOW Figure 1 and not more than 0.5 ft beyond the depths and extents shown on the figures unless directed by the KO / COR.

Excavation shall be performed in a manner that will limit spills and the potential for contaminated material to be mixed with uncontaminated material. An excavation log describing visible signs of contamination encountered shall be maintained for each area of excavation. Excavation logs shall be prepared in accordance with American Society for Testing and Materials (ASTM) D 5434.

Analytical test results associated with remediation compliance sampling shall be provided to USACE for acceptance before extending an excavation beyond the limits shown in the SOW Figure 1 and before backfilling.

Sloped excavations must not extend beyond safe working distances from existing structures, utilities, stockpiles, and work area boundaries.

3.4.1.5 Control and Management of Solid Wastes

Solid wastes produced outside of the exclusion zone that do not contain FUSRAP or chemical contaminants shall be placed in covered containers that are regularly emptied. The Contractor shall prevent contamination of the site or other areas when handling and disposing of wastes. All work areas shall be clean at project completion. All solid waste (including non‐hazardous debris) shall be removed from the site and disposed offsite at an approved landfill. Solid waste disposal must comply with most stringent local, state, and Federal requirements including 40 CFR 241, 40 CFR 243, and 40 CFR 258.

Section 02 61 13 Page 8

3.4.2 Shoring

If workers must enter the excavation, it shall be evaluated, shored, sloped or braced as required by EM 385‐1‐1 and 29 CFR 1926 section 650.

3.4.3 Dewatering

Surface water shall be diverted to prevent entry into an excavation. Dewatering shall be performed to assure adequate access, a safe excavation, prevent the spread of contamination, and to ensure that compaction requirements can be met. Water removed from an excavation or remediation area shall be handled and treated (if necessary) to remove contaminants. Onsite water treatment (if used) and discharge to surface water shall be performed in accordance with the Government‐approved WMP and Section 01 57 23. Storage, transportation, and offsite water treatment (if used) shall be performed in accordance with Section 02 81 00.

3.5 REMEDIATION COMPLIANCE SAMPLING AND ANALYSIS

The Contracting Officer shall be present to inspect the removal of FUSRAP‐contaminated material from each excavation area. After all material suspected of being FUSRAP‐contaminated has been removed, the excavation shall be sampled by the Contractor to determine if FUSRAP contamination is present.

Locations of samples shall be marked in the field, surveyed, and documented on as‐built drawings.

The samples shall be analyzed in accordance with the Contractor’s Final Status Survey Plan. Based on test results, propose any additional excavation that may be required to remove material that contains FUSRAP contaminants above the remediation criteria. Excavation of additional material shall be as directed by the Contracting Officer.

3.6 EXCAVATED MATERIAL STORAGE

Excavated material shall be placed directly in transport vehicles or in temporary storage areas immediately after excavation. Storage areas shall be in good condition and constructed of materials that are compatible with the material to be stored. If multiple storage areas are required, each area shall be clearly labeled and a written log shall be kept to track the source of the material in each temporary storage area.

3.6.1 Stockpiles

Stockpiles used to temporarily store contaminated material shall be located as shown on drawings provided in the USACE‐accepted Site Operations Plan. The maximum stockpile size shall be 365 cubic yards (yd3).

Stockpiles shall be constructed using the following requirements:

• A chemically resistant geomembrane liner free of holes and other damage. Non‐reinforced geomembrane liners shall have a minimum thickness of 20 mils. Scrim reinforced geomembrane liners shall have a minimum weight of 40 lbs/1,000 ft2. The ground surface on which the geomembrane is to be placed shall be free of rocks greater than 0.5 inch diameter and any other object that could damage the membrane.

Section 02 61 13 Page 9

• The liner system shall be sloped to allow collection of leachate. Liquid that collects in the stockpile shall be removed, stored, and treated in accordance with Section 4.10.

• A geomembrane cover that is free of holes or other damage to prevent precipitation from entering the stockpile. Non‐reinforced geomembrane covers shall have a minimum thickness of

10 mils. Scrim reinforced geomembrane covers shall have a minimum weight of 26 lbs/1,000 ft2.

The cover material shall be extended over the berms and anchored or ballasted to prevent it from being removed or damaged by wind.

• Stockpile heights shall not exceed 15 ft.

• Berms surrounding each stockpile shall be a minimum of 12 inches in height. Vehicle access points shall also be bermed.

Stockpile areas shall be covered and secured overnight and during weekends and holidays. Contingent measures shall be available to reduce potential odors, radiological, and particulate emissions.

Samples from beneath each stockpile area shall be collected prior to construction of and after removal of the stockpile. Samples shall be collected at a frequency of one per 500 ft2 from 0 to 0.5 ft for analysis of FUSRAP and chemical contaminants.

Based on test results, soil that has become contaminated by FUSRAP or chemical parameters shall be removed, handled, transported and disposed at no additional cost to the USACE. Contaminated material that is removed from beneath the stockpiles shall be removed, handled, transported, and disposed in accordance with procedures established in this SOW and the USACE‐accepted Site Operations Plan.

3.6.2 Roll‐Off Units

Roll‐off units used to temporarily store contaminated material shall be water tight. A cover shall be placed over the units to prevent precipitation from contacting the stored material. The units shall be located as shown on drawings provided in the Government‐ approved Site Operations Plan. Liquid that collects inside the units shall be removed and stored in accordance with paragraph Liquid Storage.

3.6.3 Liquid Storage

Liquid collected from the excavations, Exclusion Zone work areas, stockpiles, and roll‐off units shall be temporarily stored in water‐tight containers that shall be located as shown on drawings provided in the Government‐approved Site Operations Plan and Water Management Plan.

3.7 SAMPLING

3.7.1 Sampling of Stockpiled/Containerized Material

Samples of excavated soils / fill shall be collected at a frequency of one per 100 yd3 and analyzed for the parameters required by the disposal facility(ies).

3.7.1.1 FUSRAP‐Contaminated Soils / Fill / Debris

Excavated material containing FUSRAP contaminants above the cleanup goals shall be managed and disposed as FUSRAP contaminated soil / fill / Debris.

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3.7.1.2 Chemically‐Contaminated Soils / Fill / Debris

Excavated material that does not contain FUSRAP‐contaminants above the cleanup goals listed in the SOW but contains chemical contaminants above place‐back criteria shall be managed as chemically‐ contaminated soil / fill / debris. Chemically‐contaminated soil/fill/debris must be safely managed so that it does not interfere with site remediation activities or result in the release or spread of contamination. The Site Owner is responsible for any additional handling and disposal of this material.

THIS SOW DOES NOT INCLUDE ADDITIONAL HANDLING AND DISPOSAL OF CHEMICALLY‐

CONTAMINATED SOIL / FILL.

3.7.2 Sampling Liquid

Liquid collected from the remediation areas and treated onsite shall follow the Government‐accepted Water Management Plan. Treated liquid shall be sampled, analyzed, and discharged in accordance with the Government‐accepted Water Management Plan and Sampling Analysis Plans and Sections 01 35

45.00.00.10 and 01 57 23.

Offsite treatment / disposal of contaminated liquid (if used) shall conform to local, state, and Federal criteria as well as to the requirements of the treatment facility. Documentation of all analyses performed shall be furnished to the Contracting Officer. Additional sampling and analysis required by the approved offsite treatment facility shall be the responsibility of the Contractor and shall be performed at no additional cost to the Government.

3.7.3 Sampling Beneath Storage Areas and Temporary Haul Roads

All constructed temporary haul roads shall be removed at the conclusion of the remedial action or when no longer needed. Samples of each haul road shall be collected prior to removal of the road at a frequency of one per 500 ft2 from 0 to 0.5 ft for analysis of FUSRAP and chemical contaminants.

Samples from beneath each haul road shall be collected prior to construction of and after removal of the road. Samples shall be collected at a frequency of one per 500 ft2 from 0 to 0.5 ft for analysis of FUSRAP and chemical contaminants.

Based on test results, road materials and / or soils that have become contaminated by FUSRAP or chemical parameters shall be removed, handled, transported and disposed at no additional cost to the Government. Contaminated material that is removed shall be handled, transported, and disposed in accordance with procedures established in this SOW and the USACE‐accepted Site Operations Plan.

3.8 SPILLS

In the event of a spill or release of a hazardous substance (as designated in 40 CFR 302), pollutant, contaminant, or oil (as governed by the Oil Pollution Act, 33 U.S.C. 2701 et seq.), notify the Contracting Officer immediately. If the spill exceeds the reporting threshold, follow the pre‐established procedures described in the Government‐accepted Spill Prevention and Control Plan for immediate reporting and containment. Immediate containment actions shall be taken to minimize the effect of any spill or leak.

Cleanup shall be in accordance with applicable Federal, state, and local regulations. As directed by the Contracting Officer, additional sampling and testing shall be performed to verify spills have been cleaned

up. Spill cleanup and testing shall be done at no additional cost to the Government.

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3.9 BACKFILLING

3.9.1 General

Excavations shall be backfilled immediately after all FUSRAP contaminated materials have been removed and remediation compliance analytical results have been accepted by USACE. Backfill shall be placed and compacted to the lines and grades shown on drawings provided in the USACE‐approved Site Operations Plan.

Suitable backfill materials shall consist of GW, GP, GM, GC, SW, SP, SM, SC, ML, MH, CL, or CH soils that do not contain FUSRAP and chemical contaminants above the cleanup goals / criteria, roots and other organic matter, trash, debris, snow, ice, frozen materials, or other undesirable material determined by the USACE. The maximum particle size within the backfill shall be less than 6 inches. Materials classified as GW or GP shall not be used within 2 ft of the proposed final grade.

Backfill shall be obtained from offsite sources accepted by the KO / COR. Material classification tests, shall be performed at a frequency of one sample per 3,000 cubic yards (yd3) and additional tests when a change in material occurs.

3.9.2 Sequence

The following backfilling sequence shall be used:

• Place clean imported fill in the excavation first.

• Place any place‐back soils above the clean imported fill. Place‐back soils that contain minor concentrations of chemical contaminants shall not be placed within 5 ft of the water table surface.

• Place topsoil (minimum 4 inch thickness) above the place‐back soils or imported fill (if place‐ back soils are not used).

3.9.3 Compaction

Approved backfill shall be placed in lifts with a maximum loose thickness of 8 inches. Soil shall be compacted to 90 percent of ASTM D 698 maximum dry density. Density tests shall be performed at a frequency of one per 10,000 ft2 per lift. A minimum of one density test shall be performed on each lift of backfill placed. Field in‐place dry density shall be determined in accordance with ASTM D 1556, ASTM D 2167, or ASTM D 6938. If ASTM D 6938 is used, a minimum of one in ten tests shall be checked using ASTM D 1556 or ASTM D 2167. Test results from ASTM D 1556 or ASTM D 2167 shall govern if there is a discrepancy with the ASTM D 6938 test results.

3.9.4 Hydraulic Conductivity

Hydraulic conductivity of the compacted backfill shall be less than or equal to the criteria listed in Table 2.2‐2.

3.9.5 Final Grades and Drainage

Remediated areas and areas disturbed during site activities shall be backfilled and graded to achieve positive drainage in accordance with the USACE‐approved Backfill and Site Restoration Plan.

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3.10 DISPOSAL REQUIREMENTS

3.10.1 FUSRAP‐Contaminated Soils / Fill

Offsite disposal of FUSRAP‐contaminated soils / fill shall be in accordance with the Government Approve Waste Management Transportation and Disposal Plan and Section 02 81 00.00 10.

3.10.2 Chemically‐Contaminated Soils / Fill

THE SOW AND THIS SECTION DO NOT INCLUDE ADDITIONAL HANDLING AND DISPOSAL OF

CHEMICALLY‐CONTAMINATED SOILS / FILL.

3.10.3 Construction / Demolition Debris

Offsite disposal of FUSRAP‐contaminated construction/demolition debris shall be in accordance with the Government Approve Waste Management Transportation and Disposal Plan and Section 02 81 00.00 10.

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