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  • SUPERFUND RECORDS CTR

    Site: OI

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    G E I C o n s u l t a n t s , I n c . 567852SDMS DocID

    SOURCE CONTROL

    PILOT-SCALE TREATABILITY STUDY PRE-DESIGN WORK PLAN

    )

    O'Connor Site

    Augusta, Maine

    Submitted by

    GEI Consultants, Inc.

    0/̂ \!'J~TAr-~o Joanne O. Morin Project Manager

    53 Regional Drive ' Revision 1 Concord, New Hampshire June 19, 1992 (603) 224-7979

  • Document SC Pilot-Scale Work Plan

    Revision 1

    Date June 19, 1992

    TABLE OF CONTENTS

    TABLE OF CONTENTS LIST OF TABLES LIST OF FIGURES LIST OF APPENDICES

    Page No.

    1. INTRODUCTION 1

    2. SITE BACKGROUND 2

    2.1 Overview of EPA Remedy for Contaminated Soil and Sediment 2

    2.2 Previous Treatability Testing 2

    2.3 Proposed Soil Handling During SC Remediation 3

    3. PURPOSE AND OBJECTIVES 5

    4. HEALTH AND SAFETY 7

    5. PILOT TEST SAMPLE SELECTION AND RATIONALE 8

    6. COLLECTION AND PREPARATION OF MATERIALS

    FOR TREATABILITY TESTING 10

    6.1 Excavation of Soil 10

    6.2 Collection of Sediment 11

    6.3 Preparation of Soil and Sediment for Treatability Testing 12

    7. SOLVENT EXTRACTION PILOT-SCALE TESTING 15

    7.1 Testing Program 15

    7.2 Solvent Extraction Treatment Batch Preparation 15

    7.3 Pilot-Scale Treatment Process Description 16

    7.4 Operation 17

    7.4.1 Site Preparation and Start-up 17

    7.4.2 Process Control 18

    7.4.3 Decontamination 19

    7.4.4 Closure 20

    7.5 Waste Generation 21

    7.6 Quality Control and Quality Assurance 21

  • Document SC Pilot-Scale Work Plan

    Revision 1

    Date June 19, 1992

    8. STABILIZATION/SOLIDIFICATION PILOT-SCALE TESTING 25

    9. DEBRIS WASHING 26

    10. REPORTING 28

    11. SCHEDULE 29

    TABLES FIGURES APPENDICES

  • Document SC Pilot-Scale Work Plan Revision 1

    Date June 19, 1992

    LIST OF TABLES

    Table1- Equipment nod Logisticslot Solvent Extraction Table 2 - Solvent Extraction Process Control Measurements Table5- Waste Generation

    LIST OF FIGURES

    Figure 1 - Site Location Map Figure 2 - Site Plan and Sampling Locations Figure 3 - Debris Areas and Contaminated Soil and Sediment Figure 4 - CF Systems Mobile Demonstration Treatment Unit Figure 5 - Schedule Requirements

    LIST OF APPENDICES

    Appendix A- Test Pit Logs

  • Document SC Pilot-Scale Work Plan Revision 1

    Date June 19, 1992 Page 1

    1. INTRODUCTION

    This document contains the Source Control (SC) Pre-Design Work Plan for Pilot-Scale Treatability Testing for the O'Connor Superfund Site in Augusta, Maine (Figure 1). lf§^' document was prepared by OB!Consultants, Inc. (Gil)of Concord, NewHampsbire foE Central Maine Power Company (CMP) of Augusta, Maine. Pilot-scale treatment of soil and sediments contaminated with polychlorinated biphenyls (PCBs) and carcinogenic polynuClear aromatic hydrocarbons (cPAHs) will be conducted by CF Systems Corporation (CF Systems) of Woburn, Massachusetts. The effectiveness of CF Systems solvent extraction technology to treat soil and sediment, and achieve cleanup standards, will be tested at pilot-scale using its mobile demonstration unit. Solidification/ stabilization testing of lead-contaminated soil will also be performed.

    Prior to solvent extraction treatment, excavated soil will be dried and sieved to simulate full-scale soil handling techniques. Debris and stones will be separated from soil and sediment to meet the maximum particle size requirement for solvent extraction treatment. The effectiveness of steam-cleaning to remove contamination residuals from oversize

    debris will also be examined.

    This SC Pre-Design Work Plan provides a description of all field activities to be performed during the pilot-scale test program. The scope of the testing program has been developed from the results of Pre-Design and Feasibility Study bench-scale treatability testing. The results of bench-scale testing are described in the "SC Pre-Design Summary Report" submitted to the U.S. Environmental Protection Agency (EPA) on January 14, 1992.

    This SC Pre-Design Work Plan is supported by the Project Operations Plan (POP) for SC activities, which has been prepared as a separate document. The POP contains the Site Management Plan, site-specific Health and Safety Plan, Community Relations Support Plan, and Sampling and Analysis Plan (SAP). The SAP contains the Field Sampling Plan (FSP) and Quality Assurance Project Plan (QAPP) for SC Pilot-Scale activities.

  • Document SC Pilot-Scale Work Plan Revision 1

    Date June 19, 1992 Page 2

    2. SITE BACKGROUND

    2.1 Overview of EPA Remedy for Contaminated Soil and Sediment

    The Site covers approximately nine acres within a larger 65-acre parcel. Previous salvage and transformer recycling activities by the F. O'Connor Company lead to uncontrolled releases of PCB-contaminated oils at the Site. Principal features on the property include a large barn that formerly housed scrap operations, an Upland Marsh, an adjacent "low area" of fill, two surface water impoundments (Upper and Lower Lagoons), three former outdoor transformer work areas (TWAs) and a former scrap area (Figure 2). Site drainage is principally controlled by the slope extending downward from the transformer work areas toward Riggs Brook. Currently, the Upper and Lower Lagoons located on the slope serve as detention basins for surface water flow from the Upland Marsh.

    Contaminated soil and sediment containing concentrations of PCBs, cPAHs, and lead above cleanup standards are to be excavated and treated on-site using a solvent extraction technology. Cleanup standards for PCBs, cPAHs and lead in soil and sediment are identified in the Record of Decision (ROD) to be 1 part per million (ppm), 1 ppm, and 248 ppm, respectively. Contaminated liquids produced during solvent extraction treatment that contain extracted PCBs and cPAHs will be destroyed off-site at a licensed Toxic Substance Control Act (TSCA) incinerator. Treated soil and sediment failing to achieve the cleanup standards will require off-site disposal.

    Soil residues remaining after solvent extraction treatment that contain lead concentrations above the 248 ppm cleanup standard will be transported off-site for land disposal. If lead-contaminated soil exceeds the toxicity characteristic concentration for lead (5 ppm), determined by the Toxicity Characteristic Leaching Procedure (TCLP) then the soil will undergo further treatment using a solidification/stabilization treatment technology. The ROD also specifies decontamination, demolition and off-site disposal of the barn.

    22 Previous Treatability Testing

    Bench-scale treatability testing was performed during Pre-Design studies in the fall of 1991 to examine whether solvent extraction could achieve the cleanup standards of 1 ppm for PCBs and cPAHs. In particular, solvent extraction was evaluated using the CF Systems' liquified propane and Resource Conservation Company's (RCC's) B.E.S.T.® treatment technologies. The bench-scale treatability testing indicated difficulty in achieving cleanup standards when soil and sediment was contaminated with PCB concentrations greater than 100 ppm. Both technologies showed poor reproducibility of treatment effectiveness in duplicate bench-scale samples. CF Systems' liquified propane extraction system appeared to remove PCBs more efficiently in initial extraction stages compared to the RCC system.

  • Document SC Pilot-Scale Work Plan Revision 1

    Date June 19, 1992 Page 3

    Pre-Design bench-scale test results were similar to results of previous bench-scale testing of solvent extraction conducted during the Feasibility Study.

    Pre-Design bench-scale testing did not clearly demonstrate effectiveness in achieving the cPAH cleanupstandard of 1ppm. Pre-Design sampling encountered cPAH concentrations in soil greater than the maximum concentration detected during the Remedial Investigation (RI). Poor cPAH treatmenteffectiveness would adversely impact SCRemedy implementation and cost.

    Solidification/stabilization testing for lead was also performed during Pre-Design bench- scale testing by RCC on the treated sample with a total lead concentration of 440 ppm. Seven solidification/stabilization agents were tested: CRS-II, LPC-II, lime/fly ash type C, lime/fly ash type F, lime, kiln dust, and portland cement. The lowest concentration of lead in the TCLP extracts were in the samples treated with LPC-II and portland cement. However, the TCLP criteria 5 ppm was not exceeded even in the treated unsolidified soil. These results indicate that at least a portion of the soil containing lead concentrations above the cleanup standard can be disposed of as solid waste and will not require solidification.

    Based on Pre-Design sampling and analysis and bench-scale studies, it is now estimated that 31,500 cubic yards (cy) of contaminated soil and sediment contain concentrations of PCBs, cPAHs, and lead above cleanup standards, and that 11,000 cy of soil and sediment will not achieve the cleanup standards during full-scale remediation. Since larger batch treatment samples are anticipated to exhibit lower treatment efficiencies during pilot testing, it is likely that the estimate of 11,000 cy of soil and sediment failing to achieve t