Clifton, Staten Island Manufactured Gas Plant (MGP) Site

Activity Updates

National Grid provides activity updates for neighbors of the Clifton former MGP site as developments related to site remediation occur. The updates will describe the work that is on-going at Operable Unit 2 (OU-2), located at 25 Willow Avenue, to remediate the former main operating portion of the Site that was closed in 1957.  Two off-site areas with MGP residuals are located adjacent to the OU-2 Site at 89 Willow Avenue and between Edgewater Street and Bay Street at 1 Edgewater Street.

Remedial activity for Operable Unit 1 (40 Willow Avenue) has been completed and the parcel is now in the Operations, Maintenance & Monitoring (OM&M) phase. There will be no further updates for OU 1, but monitoring and other reports will be placed in the Key Documents/Major Reports section of this website as they are completed and approved.    The Report Archive section under the Key Documents tab of this website will include all of the Updates.

Update for the Week Ending February 15, 2013

Systematic Excavation and Backfill Continues Beneath the Temporary Fabric Structure

On-going activities:

• Continued systematic excavation beneath the temporary fabric structure (TFS), load out, and transportation of the material in lined, covered trucks for proper treatment and disposal.
• Continued placement of demarcation barrier and compacted backfill in the excavation.
• Continued maintenance of erosion and sediment controls throughout the Site.
• Continued general housekeeping activities and collection of debris for disposal throughout the Site.
• Continued the use of odor suppressant foam and plastic sheeting within the excavation areas to prevent odors from leaving the Site.
• Continued the application of water throughout the Site to prevent the formation of dust.
• Continued monitoring for noise, vibration, and settlement on Site and on neighboring properties.
• Continued to pump and treat ground water and surface water collected throughout the Site and discharged from the treatment plant.

Compacting backfill in northeast area of the site

 

Backfill compaction testing in backfilled area

Recently completed activities:

• Completed excavation beneath TFS position #16.
• Relocated the TFS to position #17.
• Completed installation of the OU-1 containment cell safety rail.

Excavation and load-out beneath TFS position #16

 

Relocating the TFS northward to position #17

 

Future near-term activities:

• Relocate the TFS to position #18 (final location) and complete excavation, load-out and transportation of impacted material for proper treatment and disposal.
• Complete the excavation and backfilling of shallow excavation areas at the northern areas of the Site.
• Continue the final grading and placement of stone over the common fill backfill throughout the Site.
• Initiate OU-2 perimeter Site restoration activities including the installation of new, permanent fencing along Willow Avenue and Bay Street.

Grading common fill throughout the Site

Placing backfill in northeaster area of the site

Community Air Monitoring Plan Summary

Community air monitoring, initiated in February 2012, continues as intrusive activities are conducted by the remediation contractor at OU-2.  There were no fifteen-minute exceedances of odor, Particulate Matter (PM), or Total Volatile Organic Compounds (TVOC) action levels associated with ground intrusive site activities during this reporting period.

Staten Island Community Board #1 One Edgewater Plaza Room 217 Staten Island, NY 10305 Phone #: (718) 981-6900

Borough President’s Office Borough Hall Staten Island, New York 10301 Phone #: (718) 816-2057