New York City Department of Environmental Protection Hazardous Materials Assessment of Bronx Storm Water Pump Stations
Posted on July 30, 2015
Client: New York City Department of Environmental Protection
Project Type: Hazardous Materials Assessment of Bronx Storm Water Pump Stations
- Hazardous Materials Assessment
Dvirka and Bartilucci Consulting Engineers (D&B) was retained by the New York City Department of
Environmental Protection (NYCDEP) as the prime consultant to rehabilitate four pump stations in
Bronx County that manage storm water drainage on adjacent roadways. Prior to rehabilitation
activities, D&B performed a hazardous materials assessment of each of the four pump stations
with emphasis placed on identifying lead jacketed cables and pipes, lead based paint, asbestos
containing materials (ACM), mercury and polychlorinated biphenyls (PCBs).
The 233rd Street Pump Station and the Metcalf Avenue Pump Station serve the northern and southern ends of the Bronx River Parkway and consist of a small superstructure constructed circa 1932 and 1945, respectively. Both of these pump stations require engineering design services related to mechanical, electrical, and heating ventilating air conditioning (HVAC) system upgrades. The White Plains Road Pump Station and the Jerome Avenue Pump Station are sub grade stations with no superstructures serving the Cross Bronx Expressway. Both of these pump stations require mechanical upgrades, relocation of electrical controls above grade, improved access for pump removal, and ventilation provisions. As part of the engineering design, D&B’s role was to evaluate the appropriateness of various technologies for the City’s consideration and prepare construction documents for the recommended upgrades.
Given their ages, lead, ACM, mercury and PCBs are frequently found within structural components and mechanical systems of the City’s pump stations. Lead components can include electrical wiring insulation, water pipes, and painted surfaces. ACM can include pipe insulation, fireproofing, flooring, roofing and siding materials, waterproofing compounds, vibration dampeners, gaskets, and caulking among other building materials. Mercury containing equipment can include electrical switches, sensors, gauges and meters such as those used to operate the float devices at the pump stations. PCB components can include painted surfaces and other building materials. Therefore, it was necessary to identify these hazardous materials to determine the appropriate handling and disposal methods prior to rehabilitation activities.
Hazardous Materials Assessment
D&B conducted the hazardous materials assessment of the four pump stations in April 2006 that included:
• A visual assessment for lead jacketed cables and lead jointed pipes. This entailed an interior inspection of accessible electrical cabinets and exposed water pipes.
• X-ray fluorescence (XRF) testing for lead-based paint (LBP) using a LPA-1 Analyzer, which provides digital readings, as well as a visual assessment of the colors and conditions of the painted surfaces by a USEPA certified Lead-based Paint Inspector.
• Bulk sampling for asbestos containing materials (ACM) in conjunction with a visual assessment identifying the types, quantities, and conditions of the ACM by a licensed NYSDOL and NYCDEP Asbestos Investigator. The samples were analyzed by a contract laboratory using Polarized Light Microscopy (PLM) and/or Transmission Electron Microscopy (TEM) depending on whether the material was identified as friable or non-friable.
• Wipe sampling for mercury and polychlorinated biphenyls (PCBs) around various pieces of mechanical equipment and stained areas of the floors. The samples were analyzed by a contract laboratory using USEPA methods SW-846 7471 and SW-846 8082. The floor area wiped was also measured during sample collection so that concentrations could be expressed as ug/cm2.
• Preparing sketches and photographing locations and materials sampled.
Key findings of the hazardous materials assessment included the following:
• Various painted surfaces within each of the four pump stations were identified as lead based paint based on concentrations above the USEPA and NYCDEP action level of 1.0 mg/cm2.
• Lead jacketed cable was identified within the electric panel in the Metcalf Avenue Pump Station and confirmed with XRF testing as having a lead concentration of 5.8 mg/cm2.
• Lead jointed pipes were not identified within the four pump stations.
• Various building materials within each of the four pump stations were positively classified as ACM based on the USEPA NESHAP criteria of greater than 1 percent asbestos fibers in a sample of homogenous material.
• PCB concentrations were detected in wipe samples collected from the Metcalf Avenue Pump Station. A risk assessment of the PCB concentrations that were detected indicated that they were well below the USEPA risk based criteria.
• Mercury was not detected in any of the wipe samples collected from the four pump stations. Mercury containing float switches were visually identified within the White Plains Road Pump Station and the Metcalf Avenue Pump Station.
The findings of the hazardous materials were utilized to determine what components required abatement activities prior to dismantling or conducting further work on them. The hazardous materials assessment was completed on schedule and within budget.
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