Operable Unit 2: Remedial Contractor Begins Mobilization
for Site Remediation

Operable Unit 1: Operations, Maintenance and Monitoring
Activities Continue

Contractor office trailer being brought to OU-1 support area

Operable Unit 2
(25 Willow Avenue)

Operable Unit 2 (OU-2) is the site of the former manufactured gas plant that previously operated at 25 Willow Avenue and was closed in 1957. There are two off-site areas with MGP residuals that are located adjacent to the OU-2 Site at 89 Willow Avenue and between Edgewater Street and Bay Street at 1 Edgewater Street. Activities have progressed with the mobilization of the remedial contractor to OU-2 and preparation for the Community Air Monitoring Plan (CAMP) activities to be conducted during remediation activities.

On-going activities:

• Site preparation activities at 40 Willow Avenue including construction of the Water Treatment Plant pad, mobilization of office trailers, and installation of containment and soil and sediment erosion controls. See photographs.
• Site preparation activities at 25 and 89 Willow Avenue properties including removal of old fencing and installation of soil and sediment erosion controls.
• Preconstruction baseline surveys for noise, vibration and settlement on OU-1, OU-2, and surrounding properties.
• General housekeeping activities at the Site.
  

Impermeable barrier being placed over pad to suppress dust and prevent erosion

Recently completed activities:

• Mobilized the remediation contractor to the Site.
• Conducted a preconstruction topographic survey of 25 and 89 Willow Avenue properties.
• Conducted the NYSDEC/NYSDOH-approved Preliminary Design Investigation (PDI) activities on 25 Willow Avenue and 89 Willow Avenue properties.
• Completed preconstruction baseline monitoring for the CAMP.

Future near-term activities:

• Complete the baseline surveys for noise, vibration and settlement in preparation for remedial construction activities for OU-2.
• Complete mobilization activities including construction of the WTP and placement of office trailers at 40 Willow Avenue.
  
• Initiate mobilization and assembly of the Temporary Fabric Structure (TFS), and installation of the sound attenuated barrier and fencing around the OU-2 Site (25 and 89 Willow Avenue).
• Perform a Level A Subsurface Utility Investigation at the OU-2 Site.
  
• Mobilize the air monitoring contractor to the Site to begin CAMP activities prior to the initiation of intrusive construction activities.

Material being placed to prevent soil erosion in OU-1 support area

Operable Unit 1 (40 Willow Avenue)

Operable Unit 1 (OU-1) is the portion of the site at 40 Willow Avenue where the holder was located that was remediated in 2009 with the installation of a containment barrier wall. OU-1 is now under Operation & Maintenance (O&M) to monitor the effectiveness of the barrier wall remedy and remove as much as practical of the coal tar residuals remaining within the barrier wall. Field activities to study removal of coal tar from deeper levels within the containment barrier continued through February 2012. O&M activities to pump contaminated water from the recovery wells also continue.

On-going activities:

• O&M activities on the containment barrier (maintenance and inspection).
  
• Pumping of water from OU-1 containment cell.
  
• General housekeeping activities at the Site.

Recently Completed Activities:

• Collected a groundwater sample at a Lynhurst Avenue property to monitor concentrations following an interim remedial measure (IRM).

Future near-term activities:

• Collection of water level measurements from monitoring wells throughout OU-1 and vicinity.
  
• Prepare the O&M Summary Report.
  
• Collect another groundwater sample at a Lynhurst Avenue property to monitor concentrations following the IRM.

Community Air Monitoring Plan Summary

Operable Unit 1 (40 Willow Avenue)

A CAMP is implemented when intrusive activities are performed at Operable Unit 1. There were no intrusive activities at OU-1 during February. Copies of previous CAMP reports and other site documents for OU-1 are stored at the two public document repositories for the project.

Operable Unit 2 (25 Willow Avenue)

Pre-construction CAMP monitoring was completed at the OU-2 properties, and a pre-construction odor survey was conducted in adjacent areas. A CAMP will be implemented when intrusive activities begin at OU-2 in March.

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