Dames & Moore, 1999 - USDA Forest Service

they are not expected to present an unacceptable risk to receptors via the inhalation route at the
concentrations present particularly given the short expected exposure period for this area.
Baseball Field
The results of the particulate emissions screening for this exposure area are presented in Table 7.1 - 15. All
constituents were eliminated as IHSs based on this screening. Copper. and silver did not have health-based
MTCA Method A or Method B levels (due to an absence of inhalation toxicity criteria) which could be used
for screening. While these constituent concentrations appear to be elevated, they are not expected to present
an unacceptable risk to receptors via the inhalation route at the concentrations present particularly given the
short expected exposure period for this area.
Wilderness Boundary
The results of the particulate emissions screening for this exposure area are presented in Table 7.1-16. All
constituents were eliminated as MSs based on this screening. Copper, lead, molybdenum, silver, uranium
and zinc did not have health-based MTCA Method A or Method B levels (due to an absence of inhalation
toxicity criteria) which could be used for screening. While these constituent concentrations appear to be
elevated, they are not expected to present an unacceptable risk to receptors via the inhalation route at the
concentrations present, particularly given the short expected exposure period and extensive vegetative cover
present in this area.
Maintenance Yard
The results of the particulate emissions screening for this exposure area are presented in Table 7.1- 17. The
sample from the storage area was not used in this screening because the location is covered and will not
generate particulate emissions. All constituents were eliminated as IHSs based on this screening. Copper,
lead, molybdenum, silver, and zinc did not have health-based MTCA Method A or Method B levels (due to
an absence of inhalation toxicity criteria) which could be used for screening. While these constituent
concentrations appear to be elevated, they are not expected to present an unacceptable risk to receptors via
the inhalation route at the concentrations present, particularly given the short expected exposure period for
this area.
Lagoon Area
The results of the particulate emissions screening for this exposure area are presented in Table 7.1-18. The
only constituent selected as an IHS based on the screening was cadmium. Aluminum, copper, lead,
molybdenum, silver, thallium, uranium and zinc did not have health-based MTCA Method A or Method B
levels (due to an absence of inhalation toxicity criteria) which could be used for screening. While these
constituent concentrations appear to be elevated, they are not expected to present an unacceptable risk to
receptors via the inhalation route at the concentrations present, particularly given the ,short expected
exposure period for this area.
USFS Guard Station
The results of the particulate emissions screening for this exposure area are presented in Table 7.1-19.
Based on this screening, the only constituent selected as an IHS for this area was arsenic. Copper and lead
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17693M)5dl9Uuly 27. 1999;5:16 PMDRAFl' FINAL R1 REPORT