Tiered Development of Human Health PCLs Page: 27
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Tiered Development of Human Health PCLs under TRRP
Table 12. Site-Specific Data for Case Study #2 Area B.
Ter DfiitonUntsTier 1 Tier 2 Site-
Term Definition Units Default specific Value
fog Fraction Organic Carbon g-carbon/g-soil 0.002 0.02
cm3-H20
Kos Benzene 66 66
/cm 3-soil
cm3-water/
Kd Soil-water partition coefficient = Kos x fo .a 0.132 1.32
g-soil
mg/L-water/
Ksw Soil-leachate partition factor for COC Calculated Calculated
mg/kg-soil
L, Thickness of affected soil cm L2 = L, 914
L2 Depth from top of affected soil to water-bearing unit cm L2 = L, 914
cm3-air/
Bas Volumetric air content of vadose zone soils cm3-sir 0.21 0.07
cm3-wate
ews Volumetric water content of vadose zone soils /cm3-satl 0.16 0.31
UgW Groundwater Darcy velocity cm/yr - 800
cm3-water
H' Henry's Law constant /cm3 -air 0.227 0.227
Ws Width of soil source area parallel to flow m - 14.30
Table 13. GWSoiling LDF and PCL Calculation Inputs for Benzene.
GWGWing Tier 2 LDF KSw Tier 2 GWSOiling
L2/L1
( gl-) ('-/kg) (mg/kg)
0.005 7.826 0.6594 1 0.059
Tier 2 Calculation for TotSoilComb
The equations for the TotSoilcomb PCL for commercial/industrial land use are
shown below:
Tot Soilcomb - 1 where:
1 1 1
SoilInh-VP ) SOl Ing SOilDerm J
SoilSOilDerm = SoilRBELDerm (note: this RBEL is not calculated for benzene since
its vapor pressure is greater than 1 mm Hg; see 350.74(c))
Soi'Soiling = Soi1RBELIng
AirSOillnh-VP = AirRBELInh-VP x NAFRevised April 2013
TCEQ publication RG-366/TRRP-22
27
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Texas Commission on Environmental Quality. Remediation Division. Tiered Development of Human Health PCLs, pamphlet, April 2013; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth624526/m1/27/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.