Amendment 0006 - Revised Spec Section 31 23 00.pdf

Morgan Francis Remediation, Raymark Superfund Site, Stratford, CT

SECTION TABLE OF CONTENTS

DIVISION 31 - EARTHWORK

SECTION 31 23 00

EXCAVATION AND FILL

PART 1 GENERAL

1.1 REFERENCES

1.2 DEFINITIONS

1.2.1 Degree of Compaction

1.2.2 Hard Materials

1.2.3 Riprap

1.2.4 Rock

1.2.5 Impacted Soils

1.3 SUBMITTALS

1.4 DELIVERY, STORAGE, AND HANDLING

1.5 CRITERIA FOR BIDDING

1.6 REQUIREMENTS FOR OFF SITE SOIL

1.7 QUALITY ASSURANCE

1.7.1 Laboratory Certification

1.7.2 Shoring and Sheeting Plan

1.7.3 Dewatering Work Plan

1.7.4 Creek Diversion

1.7.5 Confirmatory Sampling Workplan Requirements

1.7.6 QAPP Requirements

1.7.7 Utilities

PART 2 PRODUCTS

2.1 DUST CONTROL SYSTEM

2.2 COVER SYSTEM FOR MORGAN FRANCIS OU6 CONSOLIDATION AREA

2.3 SOIL MATERIALS

2.3.1 Common Fill

2.3.2 Gravel Base

2.3.3 Topsoil

2.3.4 Vegetative Support Layer

2.3.5 Protective Cover Soil

2.4 ROCK MATERIALS

2.4.1 2-inch Crushed Stone

2.4.2 AASHTO #57 Stone

2.4.3 Peastone

2.4.4 Riprap

PART 3 EXECUTION

3.1 PROTECTION

3.1.1 Shoring and Sheeting

3.1.2 Slope Stability

3.1.3 Drainage and Dewatering

3.1.3.1 Drainage

3.1.3.2 Dewatering

3.1.4 Underground Utilities and Monitoring Wells (MW)

3.1.5 Machinery and Equipment

SECTION 31 23 00 Page 1

3.2 SURFACE PREPARATION

3.2.1 Clearing and Grubbing

3.2.2 Unsuitable Material

3.3 EXCAVATION

3.4 FILLING AND BACKFILLING

3.4.1 Morgan Francis OU6 Consolidation Area Subgrade Fill

3.4.2 Common Fill Placement

3.4.3 Gravel Base Placement

3.4.4 Topsoil Placement

3.4.5 Protective Cover Soil Placement

3.4.6 Vegetative Support Layer Placement

3.4.7 2-inch Crushed Stone

3.4.8 AASHTO #57 Stone

3.4.9 Peastone

3.5 COMPACTION

3.5.1 General Site

3.5.2 Paved Areas

3.5.3 Morgan Francis OU6 Consolidation Area

3.6 FINISH OPERATIONS

3.6.1 Grading

3.6.2 Topsoil and Seed

3.6.3 Protection of Surfaces

3.7 DISPOSITION OF SURPLUS MATERIAL

3.8 FIELD QUALITY CONTROL

3.8.1 Sampling

3.8.2 Testing

3.8.2.1 Fill and Backfill Material Testing

3.8.2.2 Bulk Specific Gravity

3.8.2.3 Density Tests

3.8.2.4 Moisture Content Tests

-- End of Section Table of Contents --

SECTION 31 23 00 Page 2

SECTION 31 23 00

EXCAVATION AND FILL

PART 1 GENERAL

1.1 REFERENCES

The publications listed below, or most current version, form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only.

AMERICAN WATER WORKS ASSOCIATION (AWWA)

ASTM C127 (2015) Standard Test Method for Density, Relative Density (Specific Gravity), and Absorption of Coarse Aggregate

AWWA C600 (2017) Installation of Ductile-Iron Mains and Their Appurtenances

ASTM INTERNATIONAL (ASTM)

ASTM D5519 (2015) Particle Size Analysis of Natural and Man-Made Riprap Materials

ASTM C136/C136M (2014) Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates

ASTM D1140 (2017) Standard Test Methods for Determining the Amount of Material Finer than 75-um (No. 200) Sieve in Soils by Washing

ASTM D1556/D1556M (2015; E 2016) Standard Test Method for Density and Unit Weight of Soil in Place by Sand-Cone Method

ASTM D1557 (2012; E 2015) Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-lbf/ft3) (2700 kN-m/m3)

ASTM D1709-A Standard Test Methods for Impact Resistance of Plastic Film by the Free-Falling Dart Method

ASTM D1790 (2014) Brittleness Temperature of Plastic Sheeting by Impact

ASTM D2103 (2015) Standard Specification for Polyethylene Film and Sheeting

ASTM D2261 (2013; R 2017) Standard Test Method for Tearing Strength of Fabrics by the Tongue (Single Rip) Procedure (Constant

SECTION 31 23 00 Page 3

Rate-of-Extension Tensile Testing Machine)

ASTM D2321 (2020) Standard Practice for Underground Installation of Thermoplastic Pipe for Sewers and Other Gravity-Flow Applications

ASTM D2487 (2017; E 2020) Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)

ASTM D2582 (2003) Standard Test Method for Puncture-Propagation Tear Resistance of Plastic Film and Thin Sheeting

ASTM D4318 (2017; E 2018) Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils

ASTM D4533 (2011) Trapezoid Tearing Strength of Geotextiles

ASTM D6938 (2017a) Standard Test Method for In-Place Density and Water Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth)

ASTM D882 (2012) Tensile Properties of Thin Plastic Sheeting

U.S. ARMY CORPS OF ENGINEERS (USACE)

EM 1110-2-1601 (1991; 1994 Change 1) Engineering and Design -- Hydraulic Design of Flood Control Channels

U.S. ENVIRONMENTAL PROTECTION AGENCY (EPA)

EPA NEEDRPG REGION 1 - EPA NEW ENGLAND ENVIRONMENTAL

DATA REVIEW PROGRAM GUIDANCE EPA Quality Assurance Unit & TechLaw Environmental Services Assistance Team (ESAT) Contract Support Office of Environmental Measurement and Evaluation (OEME), June

EPA NEEDRS REGION 1 - EPA NEW ENGLAND ENVIRONMENTAL

DATA REVIEW SUPPLEMENT For Region 1 Data Review Elements and Superfund Specific Guidance/Procedures, EPA Quality Assurance Branch & TechLaw Environmental Services Assistance Team (ESAT) Contract Support Laboratory Services and Applied Science Division (LSASD), September 2020.

EPA-540-R-08-005 Guidance for Labeling Externally Validated Laboratory Analytical Data for Superfund Use"; Office of Solid Waste and Emergency Response; EPA-540-R-08-005, January 2009

SECTION 31 23 00 Page 4

CONNECTICUT DEPARTMENT OF TRANSPORTATION (CTDOT OR ConnDOT)

CTDOT SS (2020) Standard Specification for Roads, Bridge, Facilities and Incidental Construction Form 818

1.2 DEFINITIONS

1.2.1 Degree of Compaction

Degree of compaction is expressed as a percentage of the maximum density obtained by the test procedure presented in ASTM D1557 for general soil types, abbreviated as percent laboratory maximum density.

1.2.2 Hard Materials

Weathered rock, dense consolidated deposits, or conglomerate materials which are not included in the definition of "rock" but which usually require the use of heavy excavation equipment, ripper teeth, or jack hammers for removal.

1.2.3 Riprap

Riprap is defined as a material having a gradation band similar to those specified in EM 1110-2-1601 , Chapter 3, uniform graded material. Riprap is normally produced by mechanical methods, with a jaw crusher and grizzly after the stone has been mined by blasting in a quarry. Riprap gradations have a maximum top size of 3.5 tons.

1.2.4 Rock

Solid homogeneous interlocking crystalline material with firmly cemented, laminated, or foliated masses or conglomerate deposits, neither of which can be removed without systematic drilling and blasting, drilling and the use of expansion jacks or feather wedges, or the use of backhoe-mounted pneumatic hole punchers or rock breakers; also large boulders, buried masonry, or concrete other than pavement exceeding 1 cubic yard in volume. Removal of hard material will not be considered rock excavation because of intermittent drilling and blasting that is performed merely to increase production.

1.2.5 Impacted Soils

Soils that exceed one or more of the following as determined by chemical analysis: Raymark Waste (RW) criteria as defined by as soil containing lead above 400 parts per million (ppm) and asbestos (chrysotile only) greater than 1 percent, and either copper above 288 ppm or polychlorintated biphenyls (PCBs) (Aroclor 1268 only) above 1 ppm;

Applicable Connecticut Remediation Standard Regulations (CT RSRs);

Resource Conservation and Recovery Act (RCRA) toxicity characteristic.

1.3 SUBMITTALS

USACE 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 USACE. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SECTION 31 23 00 Page 5

SD-01 Preconstruction Submittals

Dewatering Work Plan ; G, RO

Shoring and Sheeting Plan ; G, RO

Submit 15 days prior to starting work.

SD-06 Test Reports

Fill and Backfill Material Testing ; G, RO

Borrow Site Testing ; G, RO

Common Fill Test; G, RO

Gravel Base Test; G, RO

2-inch Crushed Stone Test; G, RO

AASHTO #57 Stone Test; G, RO

Peastone ; G, RO

Riprap ; G, RO

Density Tests ; G, RO

Moisture Content Tests ; G, RO

Bulk Specific Gravity ; G, RO

Copies of all laboratory and field test reports within 24 hours of the completion of the test.

1.4 DELIVERY, STORAGE, AND HANDLING

Perform in a manner to prevent contamination or segregation of materials.

1.5 CRITERIA FOR BIDDING

Base bids on the following criteria:

a. Surface elevations are as indicated in Drawings.

b. Pipes or other artificial obstructions, except those indicated, will not be encountered.

c. Material character is indicated by the boring logs.

d. Borrow material, suitable backfill and bedding material in the quantities required is not available at the Project Site(s).

e. Blasting will not be allowed. Remove material in an approved manner.

1.6 REQUIREMENTS FOR OFF SITE SOIL

Submit laboratory analytical results for sample(s) of the material, at

SECTION 31 23 00 Page 6 least ten (10) work days prior to hauling material, for review and approval. Do not bring material onsite until Borrow Site Testing results have been received and approved by Contracting Officer. Provide results for one (1) sample of material per every 1,000 cubic yards brought on-site and 1 per 500 cubic yards for topsoil. Analytical results to include:

asbestos by USEPA method 600/R-93/116, extractable total petroleum hydrocarbons (ETPH) by CTDEEP method, polychlorinated biphenyls by USEPA method 8082 including soxhlet extraction method 3540c, Method 3541 (Automated Soxhlet Extraction), and Method 3546 (Microwave Extraction), USEPA method 6020/7471, volatile organic compounds (VOCs) by USEPA method 5035/8260b, polycyclic aromatic hydrocarbons (PAHs) by USEPA method 8270, pesticides by USEPA method 8080, herbicides by USEPA method 8151 and free (physiologically available) cyanide by USEPA method 9012. The Contractor will have CT RSR metals analyzed for total metals on a mass basis (mg/kg) as well as metals by Synthetic Precipitation Leaching Procedure (SPLP).

Following review of the data, additional SPLP analysis may be required to demonstrate compliance with the criteria. All analysis to be done in accordance with the CTDEEP Reasonable Confidence Protocols. Sample collection procedures for VOCs shall be in accordance with CTDEEP's Guidance for Collecting and Preserving Soil and Sediment Samples for Determination of Volatile Organic Compounds.

No Reclaimed Miscellaneous Aggregate shall be allowed.

The source of imported material shall be from a virgin source and not be from a known or suspected release area as defined in the Connecticut Remediation Standard Regulations (CT RSRs) (Sections 22a-133k-1 to 22a-133k-3 of the Regulations of Connecticut State Agencies).

Metals concentrations reported in sample(s) of imported materials shall all be below numerical criteria specified in the CT RSRs (Residential Direct Exposure Criteria and GA Pollutant Mobility Criteria). Imported fill shall not contain detectable PCBs, volatile organic compounds, PAHs, extractable total petroleum hydrocarbons, cyanide, herbicides or pesticides that may be indicative of a release.

This analytical sampling requirement applies to the cover soils in Section 02 66 00 SELECT SOIL FOR CONSOLIDATION AREA COVER and topsoil in Section

32 92 19 TOPSOIL & SEEDING.

1.7 QUALITY ASSURANCE

1.7.1 Laboratory Certification

The Contractor has the choice to not use a NELAP certified laboratory as long as the the laboratory has the Connecticut Environmental Laboratory Certification Program (ELCP) and the analytical laboratory follows the DOD Quality Systems Manual and has DOD ELAP certification. See paragraph 1.7.6 below for more details.

1.7.2 Shoring and Sheeting Plan

Submit Connecticut Registered Professional Engineer excavation shoring design.

1.7.3 Dewatering Work Plan

Submit procedures for accomplishing dewatering work which may be required to address the accumulation of stormwater in open excavations. Submittal

SECTION 31 23 00 Page 7 shall be in accordance with Sections 02 14 00 DEWATERING and 01 33 00

SUBMITTAL PROCEDURES.

1.7.4 Creek Diversion

Excavation and filling activities will occur in the Tanner Creek Tributary and the Upper Upper Ferry Creek. The Contractor shall provide, install, and operate a creek diversion system in accordance with an approved Creek Diversion Plan. Refer to Section 31 23 20 TEMPORARY RIVER DIVERSION.

1.7.5 Confirmatory Sampling Workplan Requirements

Prepare a Confirmatory Sampling Workplan for approval before work is started. The Workplan shall describe procedures for environmental sampling and to document the removal of RW, as defined in Section 02 81 00 TRANSPORTATION AND DISPOSAL OF HAZARDOUS MATERIALS during excavation activities in accordance with the ROD and EPA;s TSCA requirements. The Contractor shall provide a workplan which addresses the following:

Sampling Rationale Analyses Field Methods and Procedures Sample Containers, Preservation, Packaging and Shipping Disposal of Residual Materials Sample Documentation and Shipment Qualify Control Field Variances Field Health and Safety Procedures

Confirmatory samples are required to be collected at 30-foot intervals along the perimeter of each excavation, where historic (RI and PDI) data do not exist at that frequency, specifically along I-95 toe of slope, and top of bank along OU3/335 Ferry Blvd.

Where available, historic data from the edge of excavations can be incorporated in the plan to meet the 30-foot and 50-foot interval requirement. These historic locations are to be identified (on figures and by sample designation) in the Confirmatory Sampling Plan. The Confirmation Sampling Plan shall include a tabular summary and figure for each property of historic Remedial Investigation and Preliminary Design Investigation samples. At a minimum, this summary shall include a figure with sample locations, sample identification, sample depth interval and analytical results. This shall be used to support the delineation of Raymark Waste to be removed from each property and for future preparation of ELURs by stakeholders.

Confirmatory samples shall be composite samples collected from 2-foot intervals (e.g., 0-2, 2-4, etc). Pavement material and organic matter (e.g.,leaf litter)(if presen) should not be included in the composite sample.

Confirmatory samples shall be collected and analyzed, and the data validated, in accordance with a site-specific QAPP to be developed by the Contractor as described in paragraph 1.7.6 below.

Samples from each preconstruction and confirmatory locaton shall be collected for analysis of RW (as defined in Section 02 81 00 TRANSPORTATION AND DISPOSAL OF HAZARDOUS MATERIALS pararaph 1.2.3)

SECTION 31 23 00 Page 8 parameters (asbestos, lead, copper, and PCBs), as described below.

At locations where the extent of excavation is fixed (i.e., property boundary, paved street, building), confirmatory samples shall be submitted to the laboratory for analysis on a standard turnaround time (TAT). "Standard TAT" is defined as no more than 10 business days from date of sample collection for metals and asbestos, and no more than 15 business days from date of sample collection for PCBs. The data for these locations will not be used to evaluate the need for additional excavation, but will be tabulated and compared to the RW criteria.

At non-fixed excavation limits, samples for asbestos, lead and copper are to be submitted to the laboratory for Standard TAT. The samples for PCB analysis are to be submitted to the laboratory for 15-day TAT.

The asbestos, lead and copper analytical results are to be compared to the following Adjusted Raymark Waste removal criteria, which are establihed at a level below the Raymark Waste removal criteria (Section 02 81 00 TRANSPORTATION AND DISPOSAL OF HAZARDOUS MATERIALS paragraph 1.2.3) to allow for error in laboratory accuracy: asbestos >

0.75 percent, lead > 340 ppm (mg/kg), copper > 216 ppm and classified, pending approval by Contracting Officer, as follows:

If asbestos and lead are reported above these Adjusted Raymark Waste removal criteria, the sampled location shall be classified as Raymark Waste for removal, and additional excavation shall be required at that location. The PCB samples from that location will not be analyzed.

If asbestos and lead are not reported near or exceeding the Adjusted Raymark Waste removal criteria (0.75 percent and 340 mg/kg, respectively), the sample is considered non-Raymark Waste, and no further excavation at that location shall be required. The PCB samples from non-Raymark Waste locations shall be submitted to the laboratory for final results within a Standard TAT. The asbestos, lead, copper, and PCB results, and comparison to the Adjusted Raymark Waste removal criteria will be provided to the Contracting Officer.

Aroclor 1268 is unique to Raymark Waste so if reported > 0.50 mg/kg with at least one other compound at or near the Adjusted Raymark Waste removal criteria shall be considered Raymark Waste and additional excavation shall be required to achieve the final limits of Raymark Waste removal.

The use of copper predated the use of Aroclor 1268, so copper may be required at concentrations near or above revised Adjusted Raymark Waste removal criteria (216 mg/kg) without Aroclor 1268 present. If copper is reported > 216 mg/kg with at least one other compound at or near the Raymark Wasted Adjusted removal criteria than this shall be considered Raymark Waste and additional excavation shall be required to achieve the final limited of Raymark Waste removal.

Due to the potential for soil analytical results to be just below these Adjusted Raymark Waste removal criteria concentrations and have only two of the three constituents exceed the Raymark Waste removal crieria, the USACE shall approve the final limits of Raymark Waste removal.

The evaluation of the expedited data shall be provided to the Contracting Officer for its review and approval as soon as possible, SECTION 31 23 00 Page 9 and no later than within 24 hours of its receipt from the laboratory.

Contracting Officer shall issue approvals or comments within 24 hours of receipt of the results.

For areas requiring additional excavation, the excavation shall be extended at that location, and the confirmatory sampling/data evaluation shall be repeated for samples collected at the new location. The Confirmatory Sampling Plan shall describe the proposed step-out distance and the associated confirmatory samples. The excavations shall be extended until all confirmatory samples are classified as non-RW, or the excavation is limited by a fixed structure (property boundary, stret, or buildin). If existing data is not available for the final extent of an excavation at a fixed structure, collect confirmatory samples to determine if additional excavation will be required under a future action.

The required methods for analysis and the project action limits (PALS) are specified in paragraph 1.7.6 of this specification and shall be documented in the site-specific QAPP.

The Confirmatory Sampling Plan shall include plans and figures which show and quantify the number of propsed historic and confirmatory sampling locations to be incorporated, along with an initial proposal for step-out locations. The Confirmation Sampling Plan shall also include a tabular summary of the RI and PDI data for each property. At a minimum, this table shall include the soil sample location ID, sample depth and analytical results to support EPA and CTDEEP preparation of the future ELUR for each property.

A figure and single comprehensive confimatory sampling table (showing new and historic data), along with comparison to RW criteria, for each excavation property shall be provided to the Contracting Officer for review and approvl within 10 business days of receipt of the final laboratory data. The figures and tables shall be incorporated in the results memo described in the QAPP requirements in paragraph in 1.7.6 below.

The preconstruction areas include several areas shown on the drawings and include the steep slope along the Morgan Francis west property line.

Sampling in this area shall be conducted every 50 feet down to 4 feet below grade. The second pre-excavation sampling location is along the existing 48-inch sanitary sewer located at the northeast end of the Morgan Francis property along Upper Upper Ferry Creek. The sampling along the sewer pipe alignment shall be conducted to a depth of 8 feet below grade and consist of 8 evenly space samples with 4 samples taken from each side of the pipe. A third area includes sampling conducted at 50 feet down 2 feet along the steep I-95 highway embankment where a minimum of 1-foot of riprap is required. The fourth area is along the top of bank on 335 Ferry Blvd. at 30 feet spacing down to 4 feet below grade.

1.7.6 QAPP Requirements

QAPP Requirements

The Contractor shall prepare a Uniform Federal Policy (UFP) Quality Assurance Project Plan (QAPP) to be accepted by the Contracting Officer and EPA. The QAPP shall specify the level of data validation required for all analytical data generated by mobile and fixed laboratories. Analytical data will be managed and validated per Contractinf Officer ER 1110-1-263

SECTION 31 23 00 Page 10 requirements. The QAPP shall specify what data validation will be provided for the samples analyzed on a Standard TAT. Because this project site has been previously investigated, the Contracting Officer and EPA will accept an abbreviated UFP QAPP. The following UFP QAPP content is required.

SAP Worksheet #1: Title and Approval Page List of Acronyms and Abbreviations SAP Worksheet #5: Project Organizational Sheet SAP Worksheet #6: Communication Pathways SAP Worksheet #9: Project Scoping Session Participants Sheet SAP Worksheet #10: Conceptual Site Model SAP Worksheet #11: Project Quality Objectives/Systematic Planning Process Statements SAP Worksheet #12: Measurement Performance Criteria - Field Quality Control (QC) Samples SAP Worksheet #14: Summary of Project Tasks SAP Worksheet #15: Reference Limits and Evaluation Tables SAP Worksheet #17: Sampling Design and Rationale SAP Worksheet #18, 19, 20 and 30: Field Project Implementation for Samples SAP Worksheet #21: Project Sampling SOP Reference Tables SAP Worksheet #23: Analytical SOP References Table SAP Worksheet #28: Laboratory QC Samples Table SAP Worksheet #34, 35 and 36 Data Verification and Validation Process Table SAP Worksheet #37: Usability Assessment References and Attachments including contractor and laboratory standard operating procedures (SOPs); and laboratory quality assurance manual, accreditations and certifications.

Confirmatory Sample Analytical Requirements

It is preferred that the laboratory selected hold accreditation by the DoD Environmental Laboratory Accreditation Program (ELAP), QSM Version 5.4 or most recent, for the analyses and matrices required, that the laboratory maintain the required DoD ELAP accreditation until all analytical work is completed and data are reported, and that analyses be conducted in accordance with the Department of Defense (DoD) Department of Energy (DOE) Consolidated Quality Systems Manual (QSM) for Environmental Laboratories, (DoD QSM Version 5.4) or most recent version.

If no such DoD-ELAP accredited laboratory can be identified, the laboratory will hold and maintain accreditation by the State of Connecticut Department of Public Health for the matrices and analyses required by this specification and analyses will be conducted in accordance with the approved QAPP.

The specific analytical method requirements are summarized below:

Analysis Method Analyte CAS Number Project Action Limit

Metals SW-846 Method 6010C

Copper

Lead

7440-50-8

743-92-1

216 mg/kg

300 mg/kg

SECTION 31 23 00 Page 11

Analysis Method Analyte CAS Number Project Action Limit

PCB Aroclors SW-846 Method 8082A

Aroclor-1016 Aroclor-1221 Aroclor-1232 Aroclor-1242 Aroclor-1248 Aroclor-1254 Aroclor-1260 Aroclor-1262 Aroclor-1268

12674-11-2 11104-28-2 11141-16-5 53469-21-9 12672-29-6 11097-69-1 11096-82-5 37324-23-5 11100-14-4 0.5 mg/kg

Asbestos EPA/600/R-93/116 (400 pt count, reporting limit to <0.25%) or EPA New England Regional Laboratory "Standard Operating Procedure for the Screening Analysis of Soil and Sediment Samples for Asbestos Content"

Asbestos (Chrysotile)

0.75% (Chrysotile)

Project Action Limits presented are conservativley set at concentrations lower than those that define Raymark Waste to account for potential error in the accuracy of analytical results.

Limits of quantitation (LOQ as defined by the DoD QSM) and Practical Quantitation Limits (PQLs) for the analyses conducted will ideally be 1/3-1/2 of the PALs presented.

All samples should be extracted with one of the allowed methods. Allowed methods include Method 3540 (Soxhlet Extraction), Method 3541 (Automated Soxhlet Extraction), and Method 3546 (Microwave Extraction).

Double-blind or single-blind Performance Evaluation (PE) samples for PCB Aroclor analysis will be submitted to the laboratory and analyzed. PE samples will be submitted at a rate of minimum of one per two-week period.

PE samples selected will target assessment of the laboratory's ability to distinguish Aroclor-1268 from similar Aroclors. PE samples obtained from EPA will be scored by EPA using their internal scoring system. For PE samples obtained from a commercial vendor, acceptance limits will be documented in the UFP-QAPP.

Data Validation

SECTION 31 23 00 Page 12

E6EDGRNM

Text Box Double-blind or single-blind Performance Evaluation (PE) samples for PCB Aroclor analysis will be submitted to the laboratory and analyzed. PE samples will be submitted at a rate of minimum of one per two-week period.

PE samples selected will target assessment of the laboratory's ability to distinguish Aroclor-1268 from similar Aroclors. PE samples obtained from EPA will be scored by EPA using their internal scoring system. For PE samples obtained from a commercial vendor, acceptance limits or recovery limits based on made-to concentrations will be documented in the UFP-QAPP.

Data validation shall be required to achieve the data quality objectives outlined in the UFP QAPP. Data used to define the limits of Raymark Waste removal, with the exception of data generated by the EPA New England Regional Laboratory, shall be validated to Tier 1/Stage 2A modified to include validation of the regional quality assurance/quality control measurement performance indicators (MPIs) (field blanks and field duplicates). Tier 2/Stage 4 shall be used for 10 percent of confirmation samples per USEPA Guidance for Labeling Externally Validated Laboratory Analytical Data for Superfund Use, Office of Solid Waste and Emergency Response; EPA-540-R-08-005 , January 2009. The level of validation to be performed focuses evaluation on batch-specific and sample-specific MPIs and the MPIs which capture sampling error. The following review elements shall be evaluated during the data validation process:

For PCB Aroclors:

Data Completeness Preservation and Holding Time Blanks Surrogates MS/MSDs Laboratory Control Spike/Spike Duplicate (LCS/LCSD) Field Duplicates Performance Evaluation (PE) Samples Compound Quantitation Limits (including percent solids)

For Lead and Copper:

Data Completeness Preservation and Holding Time Blanks Matrix Spike Laboratory Control Spike/Spike Duplicate (LCS/LCSD) Duplicate Sample Analysis Field Duplicates Compound Quantitation Limits (including percent solids)

For Asbestos:

Completeness Blanks Analyst Precision and Accuracy (calibration) Daily Standard Analysis Inter-laboratory Precision Sample Re-analysis Precision Inter-analyst QC Analysis Intra-analyst QC Analysis

Data generated by the EPA New England Regional Laboratory (mobile and fixed) will not undergo data validation.

Data validation reports (DVR)s consistent with that defined by the EPA Region 1 2018 Data Review Supplement will be generated. Documentation unique to the EPA Contract Laboratory Program (e.g., evidence audits, EXES reports) is not required. Validation of multiple laboratory reports may be included in one validation report. Each DVR shall be limited to samples received over a period of no more than 2 days and shall not include more than 30 field/field QC samples.

These review elements are as defined in the following EPA National and New England data validation guidelines, which shall be adhered to in

SECTION 31 23 00 Page 13 completing the data validation process.

EPA NEW ENGLAND ENVIRONMENTAL DATA REVIEW SUPPLEMENT For Region 1 Data Review Elements and Superfund Specific Guidance/Procedures, EPA Quality Assurance Branch & TechLaw Environmental Services Assistance Team (ESAT) Contract Support Laboratory Services and Applied Science Division (LSASD) September 2020 ( EPA NEEDRS).

REGION 1 - EPA NEW ENGLAND ENVIRONMENTAL DATA REVIEW PROGRAM GUIDANCE

EPA Quality Assurance Unit & TechLaw Environmental Services Assistance Team (ESAT) Contract Support Office of Environmental Measurement and Evaluation (OEME) June 2018 ( EPA NEEDRPG).

EPA National Functional Guidelines for Organic Superfund Methods Data Review (November 2020)

EPA National Funcational Guidelines for Inorganic Superfund Methods Data Review (November 2020)

Data validation for the import of off-site clean backfill and topsoil material and hazardous waste characterization shall be conducted to Tier 1/Stage 1:

Completed DVRs will be submitted to USACE for review within 15 business days of receipt of the analytical data.

Results Memo

A results memo shall be prepared to document the confirmatory sampling completed and the analytical results for approval by the Contracting Officer and EPA. The following report content shall be included:

Restatement of program goals per UFP QAPP.

Summary of field investigation conducted (e.g., sampling dates, samples collected, parameters analyzed, field procedures, etc.).

Deviations from the approved Confirmatory Sampling Plan and QAPP Corrective Action (if applicable).

Tables summarizing the Imported Backfill and Topsoil, preconstruction soil samples and Confirmatory Soil samples collected and soil sample analytical data.

Figures showing the excavation limits and sample locations.

Data validation memoranda and tables of data presenting the validation qualifiers added.

QA/QC discussion relative to data usability Deviations from the initial work plan and/or UFP QAPP.

Field records and logs

Analytical results for all fixed-laboratory and field laboratory analyses will be maintained and submitted as a comprehensive electronic data deliverable (EDD) that is inclusive of all such data collected in the project area under this Contract. The EDD shall be complete and error-free. The EDD will present analytical results that are consistent

SECTION 31 23 00 Page 14 with those reported to end data users during Contract execution.

The EDD will be accompanied by a users' guide which describes the EDD contents and reporting conventions used to report data to end data users during Contract execution.

The EDD and users' guide shall be provided to USACE no later than two months before the end of hte Period of Performance.

The EDD shall be provided as a Microsoft Access database.mdb file. The database will contain, at a minimum, five tables and two queries. The fields, contents, valid values, structures and relationships for the tables and queries will be reviewed with USACE prior to submittal (see Section 01 78 00 paragraph 1.7). EDD format requirements include:

- The "Test" table provided will include the fields "validated_yn" and "validation_level" as defined by the EPA Region 2 Superfund Electronic Data Submission guidance and requirements for the Chemistry EDD File Type "Test/Result with QC Data." The fields will be populated for all data in a manner consistent with the EPA Region 2 requirements and the EPA Guidance for Labeling Externally Validated Laboratory Analytical Data for Superfund Use (OSWER No. 9200.1-85, EPA 540-R-08-005, 13 January 2009). EPA Region 2 Guidance and Requirements can be found at:

https://www.epa.gov/superfund/region-2-superfund-electronic-data-submission

- The fields "validated_yn" and "validation_level" will be displayed in the table generated by the query "FlatFileViewFieldSamples."

- The "Item Description" table will include descriptions for all fields for the tables and queries included in the database.

- The "Item Description" table will present the list of valid values used for each field and a definition for each valid value.

- The users' guide or Item Descriptions table will include explanations for fields that are blank for all or a subset of results such that the end user will recognize that data are complete and correct.

- The fields and valid values will be populated in a manner that distinguishes pre-construction samples from post-construction samples as well as, if applicable, historic sample results.

The results memo shall be submitted to Contracting Officer for review and approval within 15 days of receipt of approval of the comprehensive figure and summary sampling tables required in paragraph 1.7.5 above.

1.7.7 Utilities

Movement of construction machinery and equipment over pipes and utilities during construction shall be at the Contractor's risk. Perform work as indicated in accordance with procedures outlined by utility company.

Excavation made with power-driven equipment is not allowed within two feet of known utility or subsurface construction. For work immediately adjacent to or for excavations exposing a utility or other buried obstruction, excavate by hand. Start hand excavation on each side of the indicated obstruction and continue until the obstruction is uncovered or until clearance for the new grade is assured. Support uncovered lines or other existing work affected by the contract excavation until approval for backfill is granted by Contracting Officer. Report damage to utility lines or subsurface construction immediately to Contracting Officer.

SECTION 31 23 00 Page 15

PART 2 PRODUCTS

2.1 DUST CONTROL SYSTEM

Dust control system will be used to control dust during work activities.

The system shall include, but not limited to, the following:

Watering truck for OU3 and OU6 Sites, or equivalent approved by Contracting Officer; and

DustBoss® 60 (DB-60) for OU6 consolidation area and, if applicable, adjacent OU3 and OU6 Sites, or equivalent approved by Contracting Officer.

2.2 COVER SYSTEM FOR MORGAN FRANCIS OU6 CONSOLIDATION AREA

Alternative Daily Cover System with the following specifications (or an approved material):

PROPERTY UNITS TEST METHODS MINIMUM

ACCEPTABLE VALUE

MAXIMUM

ACCEPTABLE VALUE

Weight LB/1000FT 2 ASTM D2103 28 30

3" Load @ Yield LBF ASTM D882 80 NA

3" Load @ Break LBF @ PSI ASTM D882 30 @ 1800 NA

3" Elongation @ Break

% ASTM D882 350 NA

Tongue Tear LBF ASTM D2261 15 NA

Trapezoidal Tear LBF ASTM D4533 23 NA

PRT Resistance LBF ASTM D2582 22 NA

Dart Impact Strength

LBF ASTM D1709-A 1 NA

Cold Impact Strength oF ASTM D1790 -20 NA

NA = Not Applicable

2.3 SOIL MATERIALS

2.3.1 Common Fill

Material to conform to CTDOT SS Connecticut Department of Transportation's (CTDOT or ConnDOT) "Standard Specifications for Roads, Bridges and Incidental Construction" Section M.02.01-Granular Fill of Form 818.

SECTION 31 23 00 Page 16

2.3.2 Gravel Base

Material to conform to ConnDOT "Standard Specifications for Roads, Bridges and Incidental Construction" Section M.02.02-Subbase of Form 818.

2.3.3 Topsoil

Provide as specified in Section 32 92 19 TOPSOIL & SEEDING.

2.3.4 Vegetative Support Layer

Provide as specified in Section 02 66 00 SELECT SOIL FOR CONSOLIDATION

AREA COVER.

2.3.5 Protective Cover Soil

Provide as specified in Section 02 66 00 SELECT SOIL FOR CONSOLIDATION

AREA COVER.

2.4 ROCK MATERIALS

2.4.1 2-inch Crushed Stone

Crushed stone shall meet the approval of Contracting Officer. Crushed stone shall be quarry-processed broken or crushed stone that is cleaned, washed, and well-graded. Crushed stone shall be free from soft, thin, elongated, friable, laminated, micaceous or disintegrated pieces, mud, dirt, or other deleterious material.

The 2-inch crushed stone shall be sized to meet the requirements of CTDOT Section M.01.02 size No.3 aggregate of Form 818, as follows:

Square Mesh Sieve % Passing By Weight

2 1/2 inch 100

2 inch 90 - 100

1 1/2 inch 35 - 70

1 inch 0 - 15

1/2 inch 0 - 5

The Contractor shall perform QA testing on the crushed stone at the frequency 1 per source.

Crushed stone shall meet the requirements of loss on abrasion indicated in Connecticut Department of Transportation Section M.02.02-2(a) of Form 818.

2.4.2 AASHTO #57 Stone

Crushed stone shall meet the approval of Contracting Officer. Crushed stone shall be quarry-processed broken or crushed stone that is cleaned, washed, and well-graded. Crushed stone shall be free from soft, thin, elongated, friable, laminated, micaceous or disintegrated pieces, mud, SECTION 31 23 00 Page 17 dirt, or other deleterious material. AASHTO #57 Stone shall be used for pipe and subdrainage bedding material as indicated on the drawings.

The AASHTO No.57 stone shall be sized to meet the requirements of AASHTO No.57 aggregate, as follows:

Square Mesh Sieve % Passing by Weight

1 inch 95 - 100

1/2 inch 25 - 60

No. 4 0 - 10

No. 8 0 - 5

The Contractor shall perform QA testing on the crushed stone at the frequency 1 per source.

Crushed stone shall meet the requirements of loss on abrasion indicated in Connecticut Department of Transportation Section M.02.02-2(a).

2.4.3 Peastone

Crushed stone shall meet the approval of Contracting Officer. Crushed stone shall be quarry-processed broken or crushed stone that is cleaned, washed, and well-graded. Crushed stone shall be free from soft, thin, elongated, friable, laminated, micaceous or disintegrated pieces, mud, dirt, or other deleterious material.

The Peastone shall be sized to meet the requirements of ConnDOT Section M.01.02 No.8 aggregate gradation, as follows:

Square Mesh Sieve % Passing by Weight

1/2 inch 100

3/8 inch 85 - 100

No. 4 10 - 30

No. 8 0 - 10

No. 16 0 - 5

The Contractor shall perform QA testing on the crushed stone at the frequency 1 per source.

Crushed stone shall meet the requirements of loss on abrasion indicated in Connecticut Department of Transportation Section M.02.02-2(a) of Form 818.

SECTION 31 23 00 Page 18

2.4.4 Riprap

Riprap shall be composed of a well-graded mixture which has 50% of the mixture by weight being larger than the D50 size identified on the Drawings. The diameter of the largest stone size shall not exceed 2.0 times the D50 size. Not more than 15% of the riprap shall be scattered spalls and stones less than 0.3 times the D50 size. A well-graded mixture as used herein is defined as a mixture composed primarily of the larger stone sizes but with a sufficient mixture of other sizes to fill the progressively smaller voids between the stones. The riprap shall be placed to the thickness indicated on the Drawings.

Riprap shall consist of rough hewn quarry stone of approximately rectangular shape. The stone shall be hard, angular, and of such quality that it will not disintegrate on exposure to water or weathering. The least dimension of an individual rock fragment shall be not less than one-third the greatest dimension of the fragment. The bulk specific gravity (saturated surface dry basis) of the individual stones shall be at least 2.65.

Riprap shall be as indicated on Drawings and sized to meet the requirements as follows:

Size of Stone Percent of total weight smaller than the given size

1.5 to 2.0 x D50 100

1.3 to 1.8 x D50 85

1.0 to 1.5 x D50 50

0.3 to 0.5 x D50 15

The Contractor shall perform QA gradation testing in accordance with ASTM D5519 Method A on riprap at the frequency 1 per source.

PART 3 EXECUTION

3.1 PROTECTION

3.1.1 Shoring and Sheeting

Provide shoring and sheeting where required or indicated. In addition to Chapter 25 A and B of EM 385-1-1, include provisions in the shoring and sheeting plan that will accomplish the following:

a. Prevent undermining of pavements, foundations and slabs.

b. Prevent slippage or movement in banks or slopes adjacent to the excavation

c. Allow for the abandonment of shoring and sheeting materials in place in critical areas as the work is completed. In these areas, backfill the excavation to the elevation indicated within 2 feet of the finished grade and remove the remaining exposed portion of the shoring before completing the backfill.

SECTION 31 23 00 Page 19

d. Cantilever shoring design shall be design to have a maximum deflection of 3% of excavation height.

3.1.2 Slope Stability

Due to potential slope stability concerns, primarily for locations around the perimeter of the waste consolidation area, the following measures shall be used:

a. Soil/material stockpiles should be offset a minimum of 50 feet from the perimeter crest of the cap;

b. Stockpiles should be limited to approximately 10 feet in height;

c. Equipment ground pressure should be limited to approximately 460 psf (~3 psi) within 50 feet of the perimeter cap crest;

d. Adjacent to UUFC, equipment ground pressure should be limied to approximately 250-300 psi (~2 psi) within 20 feet of the perimeter cap crest;

e. Adjacent to East Broadway, equipment ground pressure should be limited to approximately 150 psf (~1 psi) within 20 feet of the perimeter cap crest; and

f. Equipment ground pressure should be determined by dividing the operating weight by the overall wheelbase/track base area (length and width).

3.1.3 Drainage and Dewatering

Provide for the collection and disposal of surface and subsurface water encountered during construction, if encountered.

3.1.3.1 Drainage

Contractor shall grade the construction area to provide positive surface water runoff away from the construction activity and/or provide temporary ditches, swales, and other drainage features and equipment as required to maintain dry soils. Excavated slopes and backfill surfaces shall be protected to prevent erosion and sloughing. Excavation shall be performed so that the Project Site(s), the area immediately surrounding the Project Site(s), and the area affecting operations at the Project Site(s) shall be continually and effectively drained.

3.1.3.2 Dewatering

Groundwater or surface water flowing toward or into excavations shall be controlled to prevent sloughing of excavation slopes and walls, boils, uplift and heave in the excavation and to eliminate interference with orderly progress of construction. French drains, sumps, ditches or trenches will not be allowed within 3 feet of the foundation of any structure, except with specific written approval, and after specific contractual provisions for restoration of the foundation area have been made. While the excavation is open, the water level shall be maintained continuously, or as approved by Contracting Officer. Refer to additional requirements in Section 02 14 00 DEWATERING.

SECTION 31 23 00 Page 20

3.1.4 Underground Utilities and Monitoring Wells (MW)

Location of the existing utilities and MWs indicated is approximate. The Contractor shall physically verify the location and elevation of the existing utilities and MWs indicated prior to starting construction. The Contractor shall contact the Public Works Department for assistance in locating existing utilities. The Contractor shall scan the construction site with electromagnetic and sonic equipment and mark the surface of the ground where existing underground utilities are discovered. Existing monitoring wells to be properly abandoned in accordance with CT Administrative Code Section 25-128-57 performed by a registered well driller Subcontractor.

3.1.5 Machinery and Equipment

Movement of construction machinery and equipment over pipes during construction shall be at the Contractor's risk. Repair, or remove and provide new pipe for existing or newly installed pipe that has been displaced or damaged in accordance with AWWA C600 and ASTM D2321.

3.2 SURFACE PREPARATION

3.2.1 Clearing and Grubbing

Unless indicated otherwise, remove trees, stumps, logs, shrubs, brush and vegetation and other items that would interfere with construction operations within the clearing limits. Remove stumps entirely. Grub out matted roots and roots over 2 inches in diameter to at least 18 inches below existing surface. Refer to additional requirements in Section

31 11 00 CLEARING AND GRUBBING.

3.2.2 Unsuitable Material

Remove vegetation, debris, decayed vegetable matter, sod, mulch, and rubbish underneath paved areas or concrete slabs.

3.3 EXCAVATION

Excavate to lines, grades, and dimensions indicated on Drawings.

Contractor shall keep sites dust free until sites have been restored.

Reuse materials as indicated in Drawings. Implement Confirmatory Sampling Workplan as indicated on Drawings. Cover excavated areas with geotextile, as indicate in Drawing and Section 31 05 19 GEOTEXTILE, pending review of sample results (up to 72 hours from the time of sample collection.) Keep excavations free from water unless otherwise approved by the Contracting Officer when working within creek areas. Excavations below indicated grades will not be allowed without prior approval from the Contracting Officer.

3.4 FILLING AND BACKFILLING

Fill and backfill to contours, elevations, and dimensions indicated on Drawings. Compact each lift before placing overlaying lift. Several localized areas of the waste consolidation area require slopes graded to 2:1. During placement of cap soils over the geosynthetic materials in these areas, grading and compaction equipment shall be limited to the use of mini and/or handheld/walk-behind equipment. Contractor shall keep sites dust free until sites have been restored.

SECTION 31 23 00 Page 21

3.4.1 Morgan Francis OU6 Consolidation Area Subgrade Fill

Subgrade Fill will include Raymark Waste impacted soil/sediment, excavated soil from the perimeter of the consolidation area, and regraded soil material within the consolidation area. Subgrade Fill will also include crushed/sized debris (concrete, masonry, asphalt) from demolition or encountered during excavation and grading activities.

Place subgrade soil fill in 12-inch maximum loose lift thicknesses.

Compact areas not accessible to rollers or compactors with mechanical hand tampers. Aerate or moisten material as required to achieve a satisfactory moisture content to facilitate compaction. Finish to a smooth surface by blading, rolling with a smooth roller, or both. Soft sediment or soil shall be placed in uniform thin lifts no greater than 6 inches (loose lift)in any locations within the waste consolidation area or as directed by the USACE.

Debris shall be crushed/ground to a maximum particle size of 8 inches and placed in 12-inch maximum loose lifts and compacted. The total thickness of the debris layer shall not exceed 3 feet unless approved by the Contracting Officer. The top layer of debris shall be a minimum of 12 inches below the geosynthetic clay liner (GCL) of the cap system and covered with soil subgrade fill. Dispose of other types of debris other than demolition debris (tires, wood, metal) at an approved offsite disposal facility.

Contractor shall be limited to a 10,000 square foot work area where bare subgrade fills are exposed. Contractor shall deploy dust control system to maintain a dust free work area. Contractor shall deploy alternative daily cover (ADC) and ballast with sandbags as needed to areas outside of the work area.

3.4.2 Common Fill Placement

Place in 12 inch maximum loose lift thickness. Compact areas not accessible to rollers or compactors with mechanical hand tampers. Aerate or moisten material as required to achieve a satisfactory moisture content to facilitate compaction. Finish to a smooth surface by blading, rolling with a smooth roller, or both.

3.4.3 Gravel Base Placement

Place in 6 inch loose lift thickness. Compact areas not accessible to rollers or compactors with mechanical hand tampers. Aerate or moisten material as required to achieve a satisfactory moisture content to facilitate compaction. Finish to a smooth surface by blading, rolling with a smooth roller, or both.

3.4.4 Topsoil Placement

Install as specified in Section 32 92 19 TOPSOIL & SEEDING.

3.4.5 Protective Cover Soil Placement

Install as specified in Section 02 66 00 SELECT SOIL FOR CONSOLIDATION

AREA COVER.

SECTION 31 23 00 Page 22

3.4.6 Vegetative Support Layer Placement

Install as specified in Section 02 66 00 SELECT SOIL FOR CONSOLIDATION

AREA COVER.

3.4.7 2-inch Crushed Stone

Place in 12 inch loose lift thickness. Compact areas not accessible to rollers or compactors with mechanical hand tampers. Finish to a level surface by blading, rolling with a smooth roller, or both.

3.4.8 AASHTO #57 Stone

Place in 12 inch loose lift thickness. Compact areas not accessible to rollers or compactors with mechanical hand tampers. Finish to a smooth surface by blading, rolling with a smooth roller, or both.

3.4.9 Peastone

Place in maximum 12 inch loose lift thickness. Compact areas not accessible to rollers or compactors with mechanical hand tampers. Finish to a smooth surface by blading, rolling with a smooth roller, or both.

3.5 COMPACTION

Density requirements specified herein are for cohesionless materials.

When cohesive materials are encountered or used, density requirements may be reduced by 5 percent. Compaction density requirements are required for all fill materials unless otherwise directed or approved by the Contracting Officer.

3.5.1 General Site

Compact underneath areas designated for vegetation and areas outside the 5 foot line of the paved area or structure to 90 percent of ASTM D1557.

3.5.2 Paved Areas

Compact top 12 inches of subgrades to 95 percent of ASTM D1557. Compact fill and backfill materials to 95 percent of ASTM D1557.

3.5.3 Morgan Francis OU6 Consolidation Area

Compact select fill materials as specified in Section 02 66 00 SELECT SOIL

FOR CONSOLIDATION AREA COVER.

Compact each layer to specified density determined by in-place density testing. When approved or directed by the Contracting Officer, compaction of consolidation subgrade waste fill layers may be achieved by a minimum of three passes of compaction equipment in two directions (90 degrees) to achieve a firm…