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Dames & Moore, 1999 - USDA Forest Service

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Inhalation of Pdculates<br />

BR = Breathing rate (m3lday)<br />

AB2 = Inhalation absorption percentage (unitless)<br />

DUR2 = Duration of exposure (years)<br />

Soil criteria were calculated using the methodology in Soil Screening Guidance: Technical Background<br />

Document (USEPA, 1996) assuming adult exposures. Equations for this pathway are as follows:<br />

Carcinogens:<br />

Noncarcinogens:<br />

Screening Criteria (uglm') =<br />

where:<br />

-<br />

RISK x ABW2 x LIFEx UCF<br />

CPFXBRXAB~XDURZXFOC~X~<br />

PEF<br />

RfD x ABW2 x UCF x HQ<br />

Screening Criteria (ug/ m') =<br />

1<br />

BRxAB2xFOC2x-<br />

PEF<br />

RISK = Acceptable cancer risk level (unitless)<br />

ABW2 = Average body weight over period of exposure (kg)<br />

LIFE = Lifetime (years)<br />

UCF = Unit conversion factor (1,000 &mg)<br />

CPF = Cancer potency factor (kg-daytmg)<br />

BR = Breathing rate (m3lday)<br />

AB2 = Inhalation absorption percentage (unitless)<br />

DUR2 = Duration of exposure (years)<br />

FOC2 = Frequency of contact (unitless)<br />

PEF = Particulate emission factor (m3lkg)<br />

IUD = Reference dose (mgkg-day)<br />

PEF relates the concenbation of compounds of concern in soil to the concentration of dust particles in air.<br />

The PEF represents an annual average emission rate based on wind erosion that can be compared with<br />

chronic health criteria. The equation for calculating the PEF is as follows:<br />

PEF (m ' /kg) = Q/C x<br />

G:\wpd.n\oo~\boIdsn-Z\ni7O.doc 7-30<br />

11693605019Uuly 27,<strong>1999</strong>3: 16 PMDRAFT FINAL R1 REPORT<br />

3600<br />

0.036 x (I - V) x(u,/u,)'x ~(x)<br />

1

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