FINAL 
                                                                     
                                   Former Hexagon Laboratories Site 
                                                 BRONX COUNTY, NEW YORK 
                                          Site Management Plan 
                                                                     
                                                                     
                                               NYSDEC Site Number: 203003 
                                                                     
                     
                     
                     
                                                           Prepared for: 
                               New York State Department of Environmental Conservation 
                                                           625 Broadway 
                                                     Albany, NY 12233-7013 
                                                                     
                                                           Prepared by: 
                                        Ecology and Environment Engineering, P.C. 
                                                     368 Pleasant View Drive 
                                                       Lancaster, NY 14086 
                                                          (716) 684-8060 
                                                                     
                                                                     
                                                                     
                                                                     
                                 Revisions to Final Approved Site Management Plan: 
                                                                     
              Revision #    Submitted Date                    Summary of Revision                     DEC Approval Date 
                         
                         
                         
                         
                                                                     
                                                                     
                                                                     
                                                                     
                                                           MARCH 2013 
                              
          
          
                 TABLE OF CONTENTS 
         TABLE OF CONTENTS ................................................................................................ II 
         LIST OF TABLES .......................................................................................................... VI 
         LIST OF FIGURES ........................................................................................................ VI 
         SITE MANAGEMENT PLAN ........................................................................................ 1 
         1.0 INTRODUCTION AND DESCRIPTION OF REMEDIAL PROGRAM ............ 1 
         1.1 INTRODUCTION....................................................................................................... 1 
          1.1.1 General ................................................................................................................... 1 
          1.1.2 Purpose ................................................................................................................... 2 
          1.1.3 Revisions ................................................................................................................ 3 
         1.2 SITE BACKGROUND ............................................................................................... 3 
          1.2.1 Site Location and Description ................................................................................ 3 
          1.2.2 Site History ............................................................................................................. 3 
          1.2.3 Geologic Conditions ............................................................................................... 5 
         1.3 SUMMARY OF REMEDIAL INVESTIGATION FINDINGS ............................. 6 
         1.4 SUMMARY OF REMEDIAL ACTIONS .............................................................. 13 
          1.4.1 OU-1 Soils ............................................................................................................ 13 
          1.4.2 OU-2 Groundwater ............................................................................................... 14 
          1.4.3 Site-Related Treatment Systems .......................................................................... 17 
          1.4.4 Remaining Contamination .................................................................................... 17 
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         2.0 ENGINEERING AND INSTITUTIONAL CONTROL PLAN ............................ 19 
         2.1 INTRODUCTION..................................................................................................... 19 
          2.1.1 General ................................................................................................................. 19 
          2.1.2 Purpose ................................................................................................................. 19 
         2.2 ENGINEERING CONTROLS ................................................................................ 20 
          2.2.1 Engineering Control Systems ............................................................................... 20 
          2.2.2 Criteria for Completion of Remediation/Termination of Remedial Systems ...... 20 
         2.3 INSTITUTIONAL CONTROLS ............................................................................. 21 
          2.3.1 Excavation Work Plan .......................................................................................... 23 
         2.4 INSPECTIONS AND NOTIFICATIONS .............................................................. 24 
          2.4.1 Inspections ............................................................................................................ 24 
          2.4.2 Notifications ......................................................................................................... 24 
         2.5 CONTINGENCY PLAN .......................................................................................... 25 
          2.5.1 Emergency Telephone Numbers .......................................................................... 26 
          2.5.2 Map and Directions to Nearest Health Facility .................................................... 26 
          2.5.3 Response Procedures ............................................................................................ 28 
         3.0 SITE MONITORING PLAN ................................................................................... 29 
         3.1 INTRODUCTION..................................................................................................... 29 
          3.1.1 General ................................................................................................................. 29 
          3.1.2 Purpose and Schedule........................................................................................... 29 
         3.2 SOIL COVER SYSTEM MONITORING ............................................................. 30 
         3.3 MEDIA MONITORING PROGRAM .................................................................... 30 
          3.3.1 Groundwater Monitoring...................................................................................... 31 
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         3.4 SITE-WIDE INSPECTION ..................................................................................... 33 
         3.5 MONITORING QUALITY ASSURANCE/QUALITY CONTROL ................... 33 
         3.6 MONITORING REPORTING REQUIREMENTS .............................................. 34 
         4.0 OPERATION AND MAINTENANCE PLAN ....................................................... 36 
         4.1 INTRODUCTION..................................................................................................... 36 
         5.0 INSPECTIONS, REPORTING AND CERTIFICATIONS .................................. 37 
         5.1 SITE INSPECTIONS ............................................................................................... 37 
          5.1.1 Inspection Frequency ........................................................................................... 37 
          5.1.2 Inspection Forms, Sampling Data, and Maintenance Reports ............................. 37 
          5.1.3 Evaluation of Records and Reporting .................................................................. 37 
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