The Bronx Psychiatric Center site is located in a mixed use area of Bronx County. The site consists of two transformer rooms in the basement of Building #1 at the Bronx Psychiatric Center. The site is currently in use for electric power supply to the building (there are transformers and associated electrical equipment in the rooms). The psychiatric center is in use by the New York State Office of Mental Health (OMH) for patient care. Surrounding uses include residential, commercial, light industrial and utility right-of-ways. The nearest residential structure is approximately 1000 feet away east of the Hutchinson River Parkway. The prior transformers in use at the facility contained PCB dielectric fluid and leaked within the rooms, impacting the concrete floors beneath and near the transformers and the soils below the floor. A Preliminary Site Assessment was completed in 2000. Due to access limitations and the ongoing need for power supply to the building, OMH has requested that any further action to address the released PCBs be deferred until either the facility is taken out of active use or the equipment in the transformer rooms needs to be upgraded/repaired. The site was listed as a class 3 on the registry in July 2006. OMH has agreed to do annual wipe sampling of the transformer rooms. The last sampling was done in November 2008.
Site Environmental Assessment
The primary contaminants of concern at the site are polychlorinated biphenyls (PCBs). Investigations to date have shown that elevated levels of PCBs exist in the concrete floors of the two transformer rooms (up to 68,000 mg/kg) and in the soil beneath the floors (up to 23,000 mg/kg). The depth of contamination appears to be limited, and quarterly groundwater monitoring for approximately 10 years has not detected any migration of PCBs. In addition, indoor air sampling has occurred twice per year for approximately 10 years, and there have been no detections of PCBs. As of January 2007, monitoring has been reduced to wipe sampling once per year of the floors of the transformer rooms, followed up with cleanup if necessary.
Site Health Assessment
Polychlorinated biphenyls (PCBs) have been detected on the floor and in the soil under the floor in the two transformer rooms located in the basement of the building. When PCBs are detected on the floor at concentrations in excess of EPA standards, the floors are cleaned and samples are collected to verify the effectiveness of the cleaning. The transformer rooms are restricted by locked doors; therefore, the possibility of casual contact with contaminated surfaces is limited. The epoxy coating that covers portions of the floor further limits the possibility of contact with contamination. PCBs have never been detected in indoor air samples.
Contaminants of Concern
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