E. 21 st st Street MGP Site E. 21 Street MGP Site E. 14 th th , E. 17 , E. 17 th th and E. 19 th th E. 14 and E. 19 Streets MGP Sites Streets MGP Sites Update Update Con Edison Con Edison October 3, 2007 October 3, 2007
Con Edison MGP Sites Con Edison MGP Sites � 51 sites in Manhattan, Bronx, Queens and 51 sites in Manhattan, Bronx, Queens and � Westchester Westchester � 24 Sites in Manhattan, 9 in the Bronx, 3 in 24 Sites in Manhattan, 9 in the Bronx, 3 in � Queens and 15 in Westchester Queens and 15 in Westchester � Signed Voluntary Cleanup Agreement with Signed Voluntary Cleanup Agreement with � NYSDEC in 2002 to investigate and remediate, NYSDEC in 2002 to investigate and remediate, if necessary. if necessary.
st E. 21 st Street Site E. 21 Street Site � Occupies a portion of Peter Cooper Village Occupies a portion of Peter Cooper Village �
Current Site Layout and Former MGP Structures Current Site Layout and Former MGP Structures
Investigation Programs Investigation Programs � Site Characterization conducted January 2004 to Site Characterization conducted January 2004 to � April 2004 April 2004 � Remedial investigation conducted January 2006 Remedial investigation conducted January 2006 � to May 2006. to May 2006. � 170 soil borings , Over 600 soil samples taken 170 soil borings , Over 600 soil samples taken � � 41 Monitoring wells, 77 groundwater samples 41 Monitoring wells, 77 groundwater samples � � Total of 93 indoor air samples from all 21 Total of 93 indoor air samples from all 21 � buildings, 29 soil gas samples buildings, 29 soil gas samples
Investigation Results Investigation Results � No MGP impacts in surface soils No MGP impacts in surface soils � � MGP impacts in subsurface soil is very limited MGP impacts in subsurface soil is very limited � in the first 5 feet (two locations at 2 feet) with in the first 5 feet (two locations at 2 feet) with most impacts deeper than 10 feet most impacts deeper than 10 feet � Groundwater has MGP impacts but is not used Groundwater has MGP impacts but is not used � for drinking water for drinking water � No impacts in indoor air from MGP No impacts in indoor air from MGP �
PCV Water Valve Replacement PCV Water Valve Replacement Project Project � Conducted by site owner between June 2006 Conducted by site owner between June 2006 � and June 2007 and June 2007 � Con Edison worked with site owner to assess Con Edison worked with site owner to assess � MGP impacts and to assure the work was done MGP impacts and to assure the work was done with little exposure to MGP materials with little exposure to MGP materials � MGP observations confirmed investigation MGP observations confirmed investigation � results results � Air monitoring showed no air impacts Air monitoring showed no air impacts �
What’ ’s next s next What � Limited additional investigation in Stuy Cove Limited additional investigation in Stuy Cove � Park and Peter Cooper Village Park and Peter Cooper Village � Investigation of potential impacts to East River Investigation of potential impacts to East River � � Bedrock investigation Bedrock investigation � � Periodic indoor air monitoring until remedy is Periodic indoor air monitoring until remedy is � implemented or determined not to be necessary implemented or determined not to be necessary
What’ ’s next s next What Assess Remedial Alternatives Assess Remedial Alternatives � Protective of human health and the Protective of human health and the � environment environment � Remove or treat Remove or treat “ “source material source material” ” �
What’ ’s next s next What Interim Site Management Plan Interim Site Management Plan � Assure subsurface site work is done safely with Assure subsurface site work is done safely with � minimal exposure minimal exposure � Air Monitoring Air Monitoring � � Soil and water management procedures Soil and water management procedures �
Stuyvesant Town MGP Sites Stuyvesant Town MGP Sites th Street Station Site � E. 14 E. 14 th Street Station Site � th Street Station Site � E. 17 E. 17 th Street Station Site � th Street Station Site � E. 19 E. 19 th Street Station Site �
Investigation Program Investigation Program � Site Characterization conducted between Site Characterization conducted between � January 2004 and April 2004 January 2004 and April 2004 � Remedial investigation conducted between Remedial investigation conducted between � January 2006 and May 2006 January 2006 and May 2006 � Over 50 soil borings, 239 soil samples Over 50 soil borings, 239 soil samples � � 28 monitoring wells, 37 groundwater samples 28 monitoring wells, 37 groundwater samples � � Indoor air conducted in 9 buildings over the Indoor air conducted in 9 buildings over the � MGP sites MGP sites
Investigation Results Investigation Results � No MGP Impacts in surface soil No MGP Impacts in surface soil � � Very limited MGP impacts in subsurface soil Very limited MGP impacts in subsurface soil � starting at 3 feet below ground. starting at 3 feet below ground. � Minor MGP impacts in groundwater which is Minor MGP impacts in groundwater which is � not used for drinking water not used for drinking water � No MGP impacts in indoor air No MGP impacts in indoor air �
Former East 19th Street Station and E. 20 th th Street Loop Former East 19th Street Station and E. 20 Street Loop Site Characterization & Remedial Investigation Programs Site Characterization & Remedial Investigation Programs Target Compound Exceedance Exceedance Summary Target Compound Summary Color Key NO CONTAMINANT EXCEEDANCES Consultants
Former East 17th Street Station Former East 17th Street Station Site Characterization & Remedial Investigation Programs Site Characterization & Remedial Investigation Programs Target Compound Exceedance Summary Target Compound Exceedance Summary Color Key NO CONTAMINANT EXCEEDANCES MGP IMPACTS Consultants
Former East 14th Street Station Former East 14th Street Station Site Characterization & Remedial Investigation Programs Site Characterization & Remedial Investigation Programs Target Compound Exceedance Summary Target Compound Exceedance Summary Color Key NO CONTAMINANT EXCEEDANCES MGP IMPACTS Consultants
ST Water Valve Replacement Project ST Water Valve Replacement Project � Identified additional locations that may have Identified additional locations that may have � MGP impacts and will require investigation MGP impacts and will require investigation � Confirmed that MGP impacts were at least 3 Confirmed that MGP impacts were at least 3 � feet below ground surface feet below ground surface � Air monitoring showed no impacts Air monitoring showed no impacts �
What’ ’s Next s Next What � Limited additional investigation work for areas Limited additional investigation work for areas � identified during water valve work identified during water valve work � Periodic indoor air monitoring until remedy is Periodic indoor air monitoring until remedy is � implemented or deemed unnecessary implemented or deemed unnecessary � Assess remedial alternatives Assess remedial alternatives � � Implement Interim Site Management Plan Implement Interim Site Management Plan �
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