1 - the Envirostor

The equipment operator and the employee providing dust suppression were
required to upgrade their protection level to Level C with boots, gloves,
tyveks, hard hat and a half-mask respirator with organic vapor cartridges
and a dust pre-filter. The area was re-evaluated an hour later with the
OVA. The levels reported were 5.3 ppm. At this time, the employees
working in this area were advised that the continued use of the respiratory
protection was optional.
At the end of the day's activity, the OVA reading at the top of the
excavation pit was at background levels.
On Friday, October 9, 1987, the excavation activities were completed. The
last part of the contaminated soil was stockpiled to await transportation.
The stockpile was covered with plastic and backfill material. The OVA was
calibrated using zero hydrocarbon air and methane at 6.7 ppm. Background
was established outside the exclusion area and upwind of the site.
Background level was 1.6 ppm. Readings taken surrounding the covered
stockpile were reported at background levels. The level at the top of the
excavation pit was also at background.
A series of soil samples were collected in the excavation pit. The
protection level utilized during collection was Level B with boots, hard
hat, chemical resistant gloves (inner and outer), tyveks, and airline
respiratory protection.
After the samples were collected, the excavation pit was backfilled with
clean fill material.
4.5.2.3 Intesrated Sam~le Collection and Analysis
The sampling procedures utilized corresponded with specific National Insti -
tute for Occupational Safety and Health (NIOSH) methods for collection.
The pumps used to collect the samples were Gilian models. The pumps were
calibrated prior to and after sample collection. Calibration methods were