1355 Powell Street and 5750 Hollis Street

Emeryville

Asbestos, Lead Sampling & Oversight – PCB Testing & Oversight

What initially was a simple asbestos, lead, Poly-Chlorinated Biphenyl (PCB) ballast inspection and oversight of two historic buildings in Emeryville turned into a major PCB clean-up project. The site experienced two vandalism events within the transformer room located in the basement in October 2012. As a result of this vandalism event, an approximate total of 120 gallons of PCB hydraulic transformer oil was released from three on-site transformers. Previous sampling of the transformer oils indicated PCB concentrations ranging from 850,000 to 920,000 ppm. Pre-characterization sampling of the concrete adjacent to the affected zone and the soil within the transformer room was conducted. A total of 26 discrete sample locations were sampled which met the requirements cited in the EPA document 530-D-02-002, RCRA Waste Sampling Draft Technical Guidance, dated August 2002. Based on the completed concrete delineation activities, an estimated area of 1,475 sq. ft. of 5 to 6 inch deep concrete slab (approximately 27 cubic yards) and 18 cubic yards of wall along with the structural components were removed as PCB hazardous waste regulated by the Toxic Substance Control Act (TSCA). The remaining basement concrete floor and walls were removed and disposed of as non‐TSCA PCB/hazardous waste. Environmental monitoring was performed during all phases of the demolition, excavation of PCB impacted soil and load transfer into waste receptacles. Personal occupational monitoring was also performed in the breathing zone. Ambient airborne dust concentrations were recorded by a calibrated data logging/direct reading aerosol monitor. The data (PM‐10, PM‐2.5, and PM‐1.0) was recorded and logged on the field forms.

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