1 - the Envirostor

The integrated samples were analyzed by an independent laboratory which
maintains certification by the American Industrial Hygiene Association, the
National Institute for Occupational Safety and Health, and the Environ-
mental Protection Agency.
The direct reading instrumentation indicated potential exposure to vinyl
chloride monomer based on the Draeger tube length of stain. With this
indication, personnel protective equipment was upgraded to minimize the
potential exposure. The Draeger tube method is subject to several
interferences and is not considered as accurate as the integrated samples.
The integrated samples were specific for determining airborne concentra-
tions of vinyl chloride monomer, polychlorinated biphenyl, lead, and total
dust. The analytical results indicated no detectable levels of vinyl
chloride or polychlorinated biphenyl on any of the ambient or personal
samples. One sample indicated a measurable concentration for lead. This
sample was obtained along the southern perimeter fence on the final day of
3
activity monitoring. The result reported was 0.004 mg/m . All the remain-
ing samples submitted for lead analysis indicated no detectable levels.
Several of the samples analyzed for total dust concentrations reported
detectable concentrations. For those samples which did indicate total dust
3 3
concentration, the range was reported between 0.1 mg/m and 0.6 mg/m .
The Occupational Safety and Health Administration (OSHA) has established
Permissible Exposure Limits for occupational exposure to each of the in-
tegrated sample analytes. In all instances the reported concentration
levels were well below the permissi ble exposure 1 imits.
4.5.2.2 Direct Readinq Instrumentation
The direct reading instrumentation used during the excavation phase at Bay
Area Drum consisted of an organic vapor analyzer (OVA) and Draeger tubes
for vinyl chloride. The range for the vinyl chloride tubes was 0.5 parts
per million (ppm) to 6 ppm with 10 pump strokes.