REMEDIAL ACTION WORK PLAN for BROOME STREET PARKING LOT SITE New York, New York NYSDEC BCP Site No. C231137 Prepared For: GO Broome LLC 432 Park Avenue South, 2nd Floor New York, New York 10016 Prepared By: Langan Engineering, Environmental, Surveying, Landscape Architecture and Geology, D.P.C. 300 Kimball Drive Parsippany, New Jersey 07054 31 August 2020 Langan Project No. 100646801 Remedial Action Work Plan August 2020 Broome Street Parking Lot Site Page i New York, New York Langan Project No. 100646801 NYSDEC BCP Site No. C231137 CERTIFICATION I, Ronald D. Boyer, certify that I am currently a Professional Engineer as defined in 6 NYCRR Part 375 and that this Remedial Action Work Plan (RAWP) was prepared in accordance with all applicable statutes and regulations and in substantial conformance with the Division of Environmental Remediation (DER) Technical Guidance for Site Investigation and Remediation (DER-10). I certify that all information and statements in this certification are true. I understand that a false statement made herein is punishable as Class “A” misdemeanor, pursuant to Section 210.45 of the Penal Law. NYS Professional Engineer Date Signature It is a violation of Article 145 of New York State Education Law for any person to alter this document in any way without the express written verification of adoption by any New York State licensed engineer in accordance with Section 7209(2), Article 145, New York State Education Law. Remedial Action Work Plan August 2020 Broome Street Parking Lot Site Page ii New York, New York Langan Project No. 100646801 NYSDEC BCP Site No. C231137 TABLE OF CONTENTS EXECUTIVE SUMMARY ..................................................................................................................... XI 1.0 INTRODUCTION .....................................................................................................................1 1.1 Site Location and Description .....................................................................................1 1.2 Redevelopment Plan ..................................................................................................1 1.3 Description of Surrounding Property ..........................................................................2 1.4 Site History ................................................................................................................4 1.4.1 Past Uses and Ownership ..................................................................................... 4 1.4.2 Previous Environmental Reports .......................................................................... 4 2.0 DESCRIPTION OF REMEDIAL INVESTIGATION FINDINGS ...........................................................7 2.1 Field Investigation ......................................................................................................8 2.1.1 Summary of Remedial Investigation Findings....................................................... 8 2.2 Geological Conditions .............................................................................................. 10 2.2.1 Historic Fill Material ........................................................................................... 10 2.2.2 Native Soil Layers ............................................................................................... 10 2.2.3 Hydrogeology ..................................................................................................... 10 2.3 Contaminant Conditions........................................................................................... 10 2.3.1 Conceptual Site Model ....................................................................................... 10 2.3.2 Description of Areas of Concern ......................................................................... 12 2.3.3 Nature and Extent of Contamination ................................................................. 21 2.4 Qualitative Human Exposure Assessment ................................................................. 23 2.4.1 Current Conditions ............................................................................................. 23 2.4.2 Construction/Remediation Activities ................................................................. 24 2.4.3 Proposed Future Conditions ............................................................................... 25 2.4.4 Human Health Exposure Assessment Conclusions ............................................. 26 2.5 Remedial Action Objectives ...................................................................................... 26 2.5.1 Soil...................................................................................................................... 27 2.5.2 Groundwater ...................................................................................................... 27 2.5.3 Soil Vapor ........................................................................................................... 27 3.0 DESCRIPTION OF REMEDIAL ACTION PLAN ............................................................................ 27 3.1 Technical Description of Alternative I – Track 2 ......................................................... 28 3.1.1 On-Site Worker, Public Health, and Environmental Protection .......................... 29 3.1.2 SOE Construction and Fill and Soil Removal ....................................................... 30 3.1.3 UST System Removal .......................................................................................... 30 3.1.4 Confirmation Soil Sampling ................................................................................ 31 3.1.5 SSDS and Required Sealing Layer Vapor Barrier/Waterproofing Membrane ..... 31 3.1.6 Excavation Backfill .............................................................................................. 31 3.1.7 Environmental Easement ................................................................................... 32 3.1.8 Site Management Plan ..................................................................................... 32 Remedial Action Work Plan August 2020 Broome Street Parking Lot Site Page iii New York, New York Langan Project No. 100646801 NYSDEC BCP Site No. C231137 3.2 Technical Description of Alternative II – Track 4 ........................................................ 33 3.2.1 On-Site Worker, Public Health, and Environmental Protection .......................... 34 3.2.2 SOE Construction and Fill and Soil Removal ....................................................... 34 3.2.3 UST System Removal .......................................................................................... 34 3.2.4 Documentation Soil Sampling ............................................................................ 35 3.2.5 SSDS and Required Sealing Layer Vapor Barrier/Waterproofing Membrane ..... 35 3.2.6 Demarcation Barrier ........................................................................................... 35 3.2.7 Excavation Backfill .............................................................................................. 36 3.2.8 Composite Site Cover ......................................................................................... 36 3.2.9 Environmental Easement ................................................................................... 36 3.2.10 Site Management Plan ....................................................................................... 37 3.3 Evaluation of Remedial Alternatives ......................................................................... 37 3.3.1 Overall Protection of Public Health and the Environment ................................. 38 3.3.2 Compliance with Standards, Criteria, and Guidance .......................................... 38 3.3.3 Short-Term Effectiveness and Permanence ....................................................... 39 3.3.4 Long-Term Effectiveness and Permanence ........................................................ 40 3.3.5 Reduction of Toxicity, Mobility, and Volume ..................................................... 40 3.3.6 Implementability ................................................................................................ 40 3.3.7 Cost Effectiveness .............................................................................................. 41 3.3.8 Community Acceptance ..................................................................................... 42 3.3.9 Land Use ............................................................................................................. 42 3.4 Selection of Preferred Remedy ................................................................................. 42 3.4.1 Zoning ................................................................................................................ 43 3.4.2 Surrounding Property Uses ................................................................................ 43 3.4.3 Citizen Participation ........................................................................................... 43 3.4.4 Environmental Justice Concerns......................................................................... 43 3.4.5 Land Use Designations ....................................................................................... 43 3.4.6 Population Growth Patterns............................................................................... 43 3.4.7 Accessibility to Existing Infrastructure ............................................................... 44 3.4.8 Proximity to