Building lifetime relationships with our clients and employees. Building lifetime relationships with our clients and employees. Croton Point Sanitary Landfill Periodic Review Report Croton Point Landfill Railroad 1 Landfill Site Number: 360001 June 14, 2019 Prepared for: Westchester County Department of Environmental Facilities 270 North Avenue New Rochelle, New York 10801 100 Crystal Run Road, Suite 101 Middletown, NY 10941 (845) 695-0200 90 Crystal Run Road, Suite 201 Rev. 0, 6/14/19 Project 190446 TABLE OF CONTENTS REPORT CERTIFICATION .................................................................................................... II LIST OF TABLES AND FIGURES ......................................................................................... VI 1 INTRODUCTION.......................................................................................................... 7 2 SITE OVERVIEW .......................................................................................................... 8 2.1 2.2 3 RAILROAD I LANDFILL ..................................................................................................8 SITE DESCRIPTION .....................................................................................................8 CROTON POINT LANDFILL ..........................................................................................8 SITE DESCRIPTION .....................................................................................................8 PERIODIC REVIEW REPORT ..................................................................................... 10 3.1 INTRODUCTION ............................................................................................................10 3.2 POST CLOSURE OPERATION PROGRAM.................................................................11 3.3 POST CLOSURE MONITORING AND SAMPLING PROGRAM ............................11 3.4 WORK AND ACTIVITY PERFORMED ........................................................................11 3.5 GROUNDWATER AND SURFACE WATER MONITORING ..................................12 3.6 WORK AND ACTIVITY PERFORMED ........................................................................12 3.7 LANDFILL GAS WELL FIELD .......................................................................................12 3.8 FLARE/BLOWER STATION SERVICE AND MAINTENANCE .............................13 3.9 LEACHATE COLLECTION AND CONVEYANCE ...................................................13 3.10 PUMPING STATION SERVICE AND MAINTENANCE ..........................................15 3.11 RECOMMENDATIONS AND CONCLUSIONS .........................................................16 COMPLIANCE WITH SITE MANAGEMENT PLANS ......................................................16 RECOMMENDATIONS AND FUTURE PERIODIC REVIEW REPORT SUBMITTALS .........16 LIMITATIONS..................................................................................................................... 17 FIGURES ............................................................................................................................. 18 X:\PROJECTS\WCDEF\190446 - Croton LF Periodic Review Report\2019 PPR Report\2019 PRR rpt 2019-06-14.docx iii Rev. 0, 6/14/19 Project 190446 APPENDICES APPENDIX A NYSDEC LETTER WITH INSTITUTIONAL CONTROLS AND ENGINEERING CONTROLS (IC/EC) CERTIFICATION APPENDIX B WORK AND ACTIVITY PERFORMED X:\PROJECTS\WCDEF\190446 - Croton LF Periodic Review Report\2019 PPR Report\2019 PRR rpt 2019-06-14.docx iv Rev. 0, 6/14/19 Project 190446 CD-ROM DOCUMENTS CD-1 DAILY LEACHATE DISCHARGE LOGS (BY INDIVIDUAL PUMPING STATION) CD-2 SUMMARY OF MONTHLY DISCHARGE LOGS CD-3 FLARE DATA LOGS CD-4 MONTHLY GHG MONITORING LOGS CD-5 MONTHLY, QUARTERLY, SIX-MONTH, AND ANNUAL MAINTENANCE/ INSPECTION LOGS CD-6 RECOMMENDED MAINTENANCE/INSPECTION LOGS X:\PROJECTS\WCDEF\190446 - Croton LF Periodic Review Report\2019 PPR Report\2019 PRR rpt 2019-06-14.docx v Rev. 0, 6/14/19 Project 190446 List of Tables and Figures Tables Table 1 Table 2 Table 3 Total Leachate Flow Daily Average Leachate Flow Annual Leachate Flow Figures Figure 1 Figure 2 Vicinity Map Croton Point Sanitary Landfill Site Plan X:\PROJECTS\WCDEF\190446 - Croton LF Periodic Review Report\2019 PPR Report\2019 PRR rpt 2019-06-14.docx vi 1 INTRODUCTION This Periodic Review Report (PRR, Report) is being submitted consistent with the New York State Department Environmental Conservation’s (NYSDEC) Reminder Notice: Site Management Periodic Review, dated April 5, 2019 (NYSDEC’s letter) for the Croton Point Sanitary Landfill. A copy of the NYSDEC’s letter is included in Appendix A. The Croton Point Sanitary Landfill (Site) is comprised of two (2) landfills, the Croton Landfill and the Railroad I Landfill. This PRR has been prepared in conformance with the applicable requirements of the Technical Guidance for Site Investigation and Remediation (DER-10). During the reporting period as specified in the NYSDEC’s letter (May 18, 2014 to May 18, 2019), routine operation, maintenance and monitoring activities were performed in compliance with the approved Post Closure Operation and Maintenance (O&M) Manuals for the Railroad I Landfill prepared by Savin Engineers, P.C. dated April 2004 and the Croton Point Landfill prepared by Savin Engineers, P.C. dated July 1996. For this Report, data and information has been compiled from 2014 through May 18, 2019. This PRR will address topics as outlined in the NYSDEC DER-10 to include: • Evaluation of Records and Reporting - To the extent applicable, the site monitoring data, as well as results of the inspections, have been evaluated as part of the periodic review to confirm that: ▪ Engineering controls, including necessary treatment or mitigation systems and associated institutional controls are in place, are performing properly and remain effective; ▪ The Site Management (SM) plan is being implemented. The SM plan for the Site consists of the Post Closure O&M manuals; ▪ Operation and maintenance activities are being conducted properly by Westchester County Department of Environmental Facilities (WCDEF) personnel assigned to the solid waste division; and ▪ Based on this review, the remedy continues to be protective of public health and the environment. X:\PROJECTS\WCDEF\190446 - Croton LF Periodic Review Report\2019 PPR Report\2019 PRR rpt 2019-06-14.docx 7 2 SITE OVERVIEW Croton Point Park is a public park operated by Westchester County, New York and is located on a peninsula extending into the Hudson River at Croton-on-Hudson, New York. The park was partially built on two (2) closed landfills; Croton Landfill and Railroad I Landfill. Collectively they are referred to as the Croton Sanitary Landfill. 2.1 RAILROAD I LANDFILL Site Description The Railroad I Landfill is located southwest of the Village of Croton-on-Hudson as shown on Figure 1 and Figure 2. The Railroad I Landfill is a separate landfill located north of the main landfill adjacent to the Metro North Croton-Harmon Rail Yard. Railroad I is a lined landfill with a combination synthetic cap and clay-side liner, a leachate collection system