Imagine the Result Remedial Investigation Report East 11 Street
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Imagine the result Consolidated Edison Company of New York, Inc. Remedial Investigation Report East 11th Street Works Site NYSDEC Site No. V00534 November 13, 2007 Remedial Investigation Report East 11th Street Works Site Terry D. Taylor Senior Scientist Margaret Carrillo-Sheridan, P.E. Vice President Prepared for: Consolidated Edison Company of New York, Inc. Prepared by: ARCADIS of New York, Inc. 655 Third Avenue 12th Floor New York New York 10017 Tel 212.682.9271 Fax 212.682.9275 Our Ref.: B0043013.0000 Date: November 13, 2007 This document is intended only for the use of the individual or entity for which it was prepared and may contain information that is privileged, confidential and exempt from disclosure under applicable law. Any dissemination, distribution or copying of this document is strictly prohibited. Table of Contents 1. Introduction 1 1.1 Overview 1 1.2 Report Organization 2 1.3 Gas Works Description 3 1.4 Current Land Use 4 1.4.1 Block 367 Lot 1 – Jacob Riis Houses 4 1.4.2 Block 367 Lot 25 – Manhattan Pump Station 4 1.4.3 Block 382 Lot 22 – Church of St. Emeric 5 1.4.4 Block 382 Lot 1 – Haven Plaza 5 1.4.5 Block 316 Lots 114 and 200 – East River Park 5 1.5 Site History 6 2. Summary of Previous Investigations 8 2.1 Overview 8 2.2 Site Characterization Study Report 8 2.2.1 Objectives 8 2.2.2 Findings 9 2.2.2.1 Jacob Riis Area 9 2.2.2.2 Saint Emeric’s Area 10 2.3 Indoor Air Quality and Soil Gas Study 11 3. Remedial Investigation Activities 12 3.1 Underground Utility Clearance 14 3.2 Subsurface Soil Investigation 14 3.3 Groundwater Investigation 16 3.3.1 Monitoring Well Installation 16 3.3.2 Groundwater Sample Collection 18 3.4 Vapor Sampling 18 G:\Div10\Con Edison\2007\242711022_RI Report_FINAL_4_23_08.doc i Table of Contents 3.4.1 Sampling Methodology 19 3.4.2 Laboratory Analyses 21 3.5 Data Usability Assessment 21 3.6 Investigation-Derived Waste Management 22 3.7 Survey 22 4. Field Observations and Findings 23 4.1 Regional Geological Setting 23 4.2 Site Geology 24 4.2.1 Fill Unit 24 4.2.2 Sand-Silt Unit 24 4.2.3 Silt-Clay Unit 25 4.3 Site Hydrogeology 25 4.4 Field Observations of MGP-related Impacts 26 4.4.1 Potential Sources of Impacts 26 4.4.2 Field Observations of Potential Impacts 27 5. Analytical Results 30 5.1 Screening Criteria 30 5.2 Surface Soil 31 5.2.1 VOCs 32 5.2.2 SVOCs 32 5.2.3 Inorganics, Cyanide and PCBs 33 5.3 Subsurface Soil 33 5.3.1 VOCs 34 5.3.2 SVOCs 35 5.3.3 Inorganics, Cyanide and PCBs 36 5.4 Groundwater 37 5.4.1 VOCs 37 G:\Div10\Con Edison\2007\242711022_RI Report_FINAL_4_23_08.doc ii Table of Contents 5.4.2 SVOCs 38 5.4.3 Inorganics and Cyanide 39 5.5 Air Sampling Results 40 5.5.1 Jacob Riis 40 5.5.2 Saint Emeric’s 40 6. Qualitative Human Health Evaluation 42 6.1 Site-Specific COPCs 42 6.2 Contaminant Fate and Transport 42 6.2.1 Benzene 42 6.2.2 Toluene 43 6.2.3 Ethylbenzene 43 6.2.4 Xylenes 43 6.2.5 PAHs 43 6.2.6 Arsenic 44 6.2.7 Lead 44 6.3 Potential Exposure Points, Receptors and Route of Exposure 44 6.3.1 Inhalation of indoor air 46 6.4 Summary 46 7. Conceptual Site Model 48 7.1 DNAPL Sources and Movement 48 7.2 DNAPL Delineation 48 8. Summary and Conclusions 50 8.1 Site Setting 50 8.2 Hydrogeology 50 8.3 NAPL Evaluation 51 8.4 Soil Evaluation 52 G:\Div10\Con Edison\2007\242711022_RI Report_FINAL_4_23_08.doc iii Table of Contents 8.5 Groundwater Evaluation 52 8.6 Indoor Air/Soil Vapor Evaluation 53 8.7 Human Health Exposure Assessment 53 8.8 Conclusions and Recommendations 53 9. References 55 Tables 1 Summary of Properties Included in Remedial Investigation Activities 2 Summary of Site History 3 Subcontractors Used During Remedial Investigation Activities 4 Soil Boring Location Summary 5 Sample Summary 6 Monitoring Well Construction Summary 7 Water Level Summary 8 Air Sample Location Summary 9 Summary of Field Observations 10 Summary of VOCs Detected in Surface Soil 11 Summary of SVOCs Detected in Surface Soil 12 Summary of Inorganics Detected in Surface Soil 13 Summary Statistics for Surface Soil 14 Summary of VOCs Detected in Exploratory Test Pit Trenches 15 Summary of SVOCs Detected in Exploratory Test Pit Trenches 16 Summary of Inorganics Detected in Exploratory Test Pit Trenches 17a Summary of VOCs Detected in Subsurface Soil (Site Characterization) 17b Summary of VOCs Detected in Subsurface Soil (Remedial Investigation) 18a Summary of SVOCs Detected in Subsurface Soil (Site Characterization) G:\Div10\Con Edison\2007\242711022_RI Report_FINAL_4_23_08.doc iv Table of Contents 18b Summary of SVOCs Detected in Subsurface Soil (Remedial Investigation) 19a Summary of Inorganics Detected in Subsurface Soil (Site Characterization) 19b Summary of Inorganics Detected in Subsurface Soil (Remedial Investigation) 20 Summary Statistics for Subsurface Soil (SC and RI) 21a Summary of VOCs Detected in Groundwater (Site Characterization) 21b Summary of VOCs Detected in Groundwater (Remedial Investigation) 22a Summary of SVOCs Detected in Groundwater (Site Characterization) 22b Summary of SVOCs Detected in Groundwater (Remedial Investigation) 23a Summary of Inorganics Detected in Groundwater (Site Characterization) 23b Summary of Inorganics Detected in Groundwater (Remedial Investigation) 24 Summary Statistics for Groundwater 25 Summary of Indoor Air Samples (Remedial Investigation) 26 Summary of Soil Gas and Subslab Vapor Samples(Remedial Investigation) 27 Summary of Ambient Air Samples (Remedial Investigation) 28 Contaminants of Potential Concern by Environmental Media Figures 1. East 11th Street Works Site 2. Site Location Map 3. Site Map with Former MGP Structures, Sample Locations, and Cross-Section Transects 4. Site Plan with Air Sample Locations 5. Generalized Geologic Cross Section A-A’ 6. Generalized Geologic Cross Section B-B’ G:\Div10\Con Edison\2007\242711022_RI Report_FINAL_4_23_08.doc v Table of Contents 7. Generalized Geologic Cross Section C-C’ 8. Generalized Geologic Cross Section D-D’ 9. Generalized Geologic Cross Section E-E’ 10. Generalized Geologic Cross-Section F-F’ 11. Top of Clay Elevation Contour Map 12. Shallow Groundwater Elevation Contour Map (March 5, 2007) 13. Summary of Visual MGP Impacts 0-10 Feet 14. Summary of Visual MGP Impacts 10-20 Feet 15. Summary of Visual MGP Impacts 20-30 Feet 16. Summary of Visual MGP Impacts 30-40 Feet 17. Summary of Visual MGP Impacts 40-50 Feet 18. Surface Soil Analytical Results 19. Subsurface Soil Analytical Results - VOCs – Saint Emeric’s and Haven Plaza 20. Subsurface Soil Analytical Results - VOCs - Jacob Riis and East River Park 21. Subsurface Soil Analytical Results - SVOCs – Saint Emeric’s and Haven Plaza 22. Subsurface Soil Analytical Results - SVOCs - Jacob Riis and East River Park 23. Subsurface Soil Analytical Results - Inorganics -Saint Emeric's and Haven Plaza 24. Subsurface Soil Analytical Results - Inorganics - Jacob Riis and East River Park 25. TVOC and SVOC in Subsurface Soil 26. Summary of Detected VOCs and SVOCs in Groundwater - Saint Emeric's and Haven Plaza 27. Summary of Detected VOCs and SVOCs in Groundwater - Jacob Riis and East River Park 28. Benzene in Groundwater Above Class GA Standard G:\Div10\Con Edison\2007\242711022_RI Report_FINAL_4_23_08.doc vi Table of Contents APPENDICES A Remedial Investigation Soil Boring/Monitoring Well Construction Logs B Analytical Laboratory Reports C Data Usability Summary Reports G:\Div10\Con Edison\2007\242711022_RI Report_FINAL_4_23_08.doc vii Remedial Investigation Report East 11th Street Works Site 1. Introduction 1.1 Overview This Remedial Investigation Report (Report) presents the results and findings of the Remedial Investigation (RI) that was conducted on behalf of Consolidated Edison Company of New York, Inc. (Con Edison) during 2006 and 2007 for the East 11th Street Works Site (Site No. V00534), the former grounds of a manufactured gas plant (MGP) that was operated by Con Edison’s predecessor companies in the lower East Side of Manhattan, New York. The RI was conducted pursuant Voluntary Cleanup Agreement Index No. D2-0003-02-08 (VCA) by and between the New York State Department of Environmental Conservation (NYSDEC) and Con Edison, and was carried out in conformance with the NYSDEC-approved October 2005 Remedial Investigation Work Plan (RIWP) prepared by TRC Environmental Corporation (TRC). As specified in Appendix A of the VCA, the East 11th Street Works Site (the Site) is compromised of the following properties: Street Address Tax Map Block/Lot Number Jacob Riis Houses Block 367 Lot 1 152 Avenue D, New York, NY Jacob Riis Houses Block 367 Lot 25 184 Avenue D, New York, NY Haven Plaza 3 Block 382 Lot 1 188 Avenue C, New York, NY St. Emeric R.C. Church and School Block 382 Lot 22 181 Avenue D, New York, NY Because the results of earlier NYSDEC-approved Site Characterization Study that Con Edison for the Site under the VCA indicated a potential for off-Site migration of MGP- related contamination the RI study area was enlarged to include the sidewalk area along East 13th Street between Avenue D and Szold Place and the portion of the East River Park between East 11th and 13th Street. The East River Park is owned by the City of New York and operated by the New York City Department of Parks and Recreation. The portions of the park included in the RI are designated as Block 316 Lot 114 and Block 316 Lot 200 on the New York City Tax Map for the Borough of Manhattan.