REMEDIAL ACTION CONTRACT 2 FOR REMEDIAL, ENFORCEMENT OVERSIGHT, AND NON-TIME CRITICAL REMOVAL ACTIVITIES IN REGION 5 DRAFT REMEDIAL ACTION REPORT OTTAWA RIVER LUCAS COUNTY, OHIO Prepared for United States Environmental Protection Agency Region 5 77 West Jackson Boulevard Chicago, IL 60604 Work Assignment No: 146-RARA-1520 Contract No: EP-S5-06-02 Date Submitted: September 2011 Prepared by: SulTRAC SulTRAC Project Manager: Jack Brunner Telephone No: (312) 201-7788 EPA Work Assignment Manager: Scott Cieniawski Telephone No: (312) 353-9184 Ottawa River Remedial Action Report September 2011 CONTENTS Section Page 1.0 INTRODUCTION ........................................................................................................................... 1 2.0 CHRONOLOGY OF EVENTS ....................................................................................................... 9 3.0 PERFORMANCE STANDARDS AND CONSTRUCTION QUALITY CONTROL ................. 11 3.1 PROJECT CLEANUP GOALS AND CONFIRMATORY SAMPLING ........................ 11 3.1.1 Confirmatory Sampling Approach ....................................................................... 11 3.1.2 Data Quality ......................................................................................................... 13 3.1.3 SWAC Calculation for Cleanup Verification ...................................................... 13 3.1.4 Additional Statistical Analysis............................................................................. 15 3.2 DEWATERING PAD CONSTRUCTION ....................................................................... 18 3.2.1 Soil Construction Quality Control ....................................................................... 19 3.2.2 LLDPE Liner Construction Quality Control ....................................................... 20 3.2.3 Geocomposite Drainage Layer ............................................................................ 21 3.2.4 Conveyance Piping .............................................................................................. 21 3.2.5 High Mast Light Pole Concrete Foundation ........................................................ 21 3.3 GEOTEXTILE TUBES .................................................................................................... 21 3.4 DREDGING OPERATIONS ............................................................................................ 22 3.4.1 Bathymetric Surveys ............................................................................................ 23 3.4.2 Surface Water Quality Monitoring ...................................................................... 26 3.5 TSCA LOAD OUT AND CONFIRMATORY SAMPLING ........................................... 29 4.0 CONSTRUCTION ACTIVITIES .................................................................................................. 30 4.1 CONSTRUCTION OF DEWATERING PADS ............................................................... 30 4.1.1 Earthwork for Dewatering Pads ........................................................................... 31 4.1.2 Geomembrane Liner Installation ......................................................................... 32 4.1.3 Piping ................................................................................................................... 33 4.1.4 Gas Collection System Modifications ................................................................. 34 4.1.5 Lighting Structures .............................................................................................. 34 4.1.6 Access Roads ....................................................................................................... 35 4.2 SHAKER AND THICKENER SYSTEM ........................................................................ 35 4.3 GEOTUBES AND POLYMER ........................................................................................ 36 4.4 DREDGING ..................................................................................................................... 37 4.4.1 Adjustments to Dredging Areas and Volumes .................................................... 38 4.4.2 Equipment ............................................................................................................ 39 4.4.3 Debris and Aqua-Blok removal ........................................................................... 46 4.4.4 Confirmatory Samples ......................................................................................... 48 4.4.5 Final Dredge Volumes and Production Rates ...................................................... 50 i Ottawa River Remedial Action Report September 2011 CONTENTS Section Page 4.5 TSCA LOAD OUT........................................................................................................... 58 4.5.1 TSCA Load Out Process...................................................................................... 58 4.5.2 Dewatering Issues and Additives......................................................................... 59 4.5.3 Load Out Completion and Site Restoration......................................................... 62 4.6 RESTORATION ACTIVITIES........................................................................................ 63 4.6.1 Initial Turf Restoration of Disturbed Areas at HRLF.......................................... 63 4.6.2 Restoration of Access Areas Required for Dredging........................................... 63 4.6.3 Final Restoration of the TSCA Dewatering Pad Area at HRLF.......................... 64 4.7 PROJECT ACCOMPLISHMENTS AND LESSONS LEARNED.................................. 65 5.0 FINAL INSPECTION ...................................................................................................................68 5.1 DEWATERING PAD CONSTRUCTION PRE-FINAL INSPECTION ........................ 68 5.2 DREDGING AND TSCA LOAD OUT PRE-FINAL INSPECTION............................. 69 5.3 FINAL REMEDIAL ACTION INSPECTION................................................................. 70 6.0 CERTIFICATION THAT REMEDY IS OPERATIONAL AND FUNCTIONAL ......................71 7.0 OPERATION AND MAINTENANCE.........................................................................................72 8.0 SUMMARY OF PROJECT COSTS .............................................................................................73 REFERENCES ...........................................................................................................................................74 ii Ottawa River Remedial Action Report September 2011 FIGURES Figure 1-1 Project Location .................................................................................................................2 Figure 1-2 Project Area - Reach 2 .......................................................................................................6 Figure 1-3 Project Area - Reach 3 .......................................................................................................7 Figure 1-4 Project Area - Reach 4 .......................................................................................................8 Figure 2-1 Ottawa River Remedial Action Project Schedule............................................................ 10 Figure 3-1 Example Confirmatory Sediment Sample Location Grid ................................................12 Figure 4-1 Example Cross Section ....................................................................................................53 Figure 4-2 Actual Volume Dredged Versus Forecasted Volume ......................................................57 TABLES Table 1-1 Subcontractor List ..............................................................................................................5 Table 3-1 Final SWAC Calculations and Cleanup Goals ................................................................14 Table 3-2 Additional Statistical Analysis Results ............................................................................16 Table 3-3 Updated SWAC for Reaches 2, 3, and 4 Based on Additional Statistical Analysis ........17 Table 3-4 Overall Project SWAC Based on Additional Statistical Analysis ...................................18 Table 3-5 QA Survey Volumes and QC Check Results ...................................................................26 Table 4-1 Polymer Delivered on Monthly Basis ..............................................................................36 Table 4-2 Geotubes Delivered to the Site ........................................................................................37 Table 4-3 Dredge Descriptions ........................................................................................................40 Table 4-4 Start and Completion Dates for DMUs and TSCA Areas ...............................................42 Table 4-5 Pipeline Lengths ..............................................................................................................43 Table 4-6 Interim TSCA Post-Dredge Sample Results ....................................................................49 Table 4-7 Summary of Non-TSCA Sample Results ........................................................................51 Table 4-8 Non-TSCA DMU Volume Calculations ..........................................................................52 Table 4-9 TSCA Area Volume Calculations ....................................................................................53 Table 4-10 Non-TSCA Re-Dredge Areas ..........................................................................................54