Street MGP Site E. 21 Street MGP Site E. 14 th th , E. 17 , E. 17 - - PowerPoint PPT Presentation

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Street MGP Site E. 21 Street MGP Site E. 14 th th , E. 17 , E. 17 - - PowerPoint PPT Presentation

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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

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SLIDE 1
  • E. 21
  • E. 21st

st

Street MGP Site Street MGP Site

  • E. 14
  • E. 14th

th, E. 17

, E. 17th

th

and E. 19 and E. 19th

th

Streets MGP Sites Streets MGP Sites Update Update

Con Edison Con Edison October 3, 2007 October 3, 2007

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SLIDE 2

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.

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SLIDE 3
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SLIDE 4
  • E. 21
  • E. 21st

st

Street Site Street Site

  • Occupies a portion of Peter Cooper Village

Occupies a portion of Peter Cooper Village

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SLIDE 5

Current Site Layout and Former MGP Structures Current Site Layout and Former MGP Structures

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SLIDE 6
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SLIDE 7

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

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SLIDE 8

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

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SLIDE 9
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SLIDE 10

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

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SLIDE 11

What What’ ’s next s next

  • 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

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SLIDE 12

What What’ ’s next s next 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” ”

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SLIDE 13

What What’ ’s next s next 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

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SLIDE 14

Stuyvesant Town MGP Sites Stuyvesant Town MGP Sites

  • E. 14
  • E. 14th

th Street Station Site

Street Station Site

  • E. 17
  • E. 17th

th Street Station Site

Street Station Site

  • E. 19
  • E. 19th

th Street Station Site

Street Station Site

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SLIDE 15
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SLIDE 16

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

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SLIDE 17

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

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SLIDE 18

Former East 19th Street Station and E. 20 Former East 19th Street Station and E. 20th

th

Street Loop Street Loop

Site Site Characterization & Remedial Investigation Programs Characterization & Remedial Investigation Programs

Target Compound Target Compound Exceedance Exceedance Summary Summary

Consultants

Color Key NO CONTAMINANT EXCEEDANCES

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SLIDE 19

Former East 17th Street Station Former East 17th Street Station

Site Site Characterization & Remedial Investigation Programs Characterization & Remedial Investigation Programs

Target Compound Exceedance Summary Target Compound Exceedance Summary

Consultants

Color Key NO CONTAMINANT EXCEEDANCES MGP IMPACTS

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SLIDE 20

Former East 14th Street Station Former East 14th Street Station

Site Site Characterization & Remedial Investigation Programs Characterization & Remedial Investigation Programs

Target Compound Exceedance Summary Target Compound Exceedance Summary

Consultants

Color Key NO CONTAMINANT EXCEEDANCES MGP IMPACTS

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SLIDE 21

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

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SLIDE 22

What What’ ’s Next s Next

  • 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