Protocol for the Derivation of Environmental and Human ... - CCME

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Part C, Section 4 4.1.1 Threshold Contaminants To derive a guideline, it is necessary to ascribe some allowable proportion of total chemical exposure to the soil medium. One approach is to base allowable contaminant apportionment to the various media in proportion to the distribution expected if the various media were in equilibrium in terms of contaminant intermedia distribution (Travis and Hattemer-Frey, 1989). This assumes that the air, water, soil and food to which most Canadians are typically exposed exist in such equilibrium. However, much of the food consumed in Canada is imported or grown in areas distant from the residence (agricultural lands being an exception). Further, many Canadians consume water that has been treated and supplied by a municipal source. Canadians also spend a majority of time indoors where air is heated, cooled, and often contaminated by emissions from various consumer products, building materials, and lifestyle activities. Therefore environmental media are not likely to be in equilibrium. Apportionment of allowable exposure between media based on theoretical equilibria is therefore not appropriate. The SEQCCS has proposed a simple, arbitrary, and practical solution to this problem which recognizes that no single medium should deplete the entire tolerable daily intake or even the entire residual tolerable daily intake (RTDI). The RTDI is the difference between the tolerable daily intake and the estimated daily intake (RTDI = TDI - EDI). With five primary media to which people are exposed (i.e., air, water, soil, food, and consumer products) the SEQCCS proposes that 20% of the residual acceptable daily intake be apportioned to each of these five media (Figure 19). 86
Part C, Section 4 Figure 19 Conceptual Derivation of the Soil Guideline for Threshold Substances from the Multi-media Exposure Assessment and Assumed Soil Apportionment (20%) from the Residual Tolerable Daily Intake The SEQCCS proposes to apportion only 20% of the RTDI to soils for the purpose of deriving soil remediation guidelines. This "Soil Allocation Factor" (SF) of 20% allows for 80% of the remaining tolerable incremental exposure to be reserved for other media (i.e., food, air, water, and consumer products). Although this soil allocation factor has been arbitrarily established, the SEQCCS believes that soils contaminated at the guideline level will not cause the total exposure from all media (air, water, food, and contaminated soil), via all direct and indirect pathways (ingestion, inhalation, and dermal absorption), to exceed the TDI. The generic soil guidelines are calculated after considering the sum of the background soil exposure and the percentage (20%) of residual tolerable daily intake allocated to soil (Figure 19). 87
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A Protocol for the Derivation of En
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Readers' Comments The Canadian Coun
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Overview In response to growing pub
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mechanisms for migration of soil co
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procédures d'élaboration des reco
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• être absorbés par les plantes
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PART B Section 1 Derivation of Envi
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Section 2 Investigation of Contamin
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PART D Section 1 Derivation of the
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List of Figures 1 National Framewor
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Acknowledgements The CCME Subcommit
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Document Organization This document
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Bioaccumulation: The process by whi
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Denitrification: The gaseous loss o
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GGG Guidelines: Generic numerical l
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Mutagenicity: The ability of a chem
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xxxiv human exposure. Risk estimati
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Soil: Normally defined as the uncon
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VVV Volatilization: The chemical pr
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Section 1 The National Contaminated
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Part A, Section 1 6
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Part A, Section 1 1.2.2.2 Remediati
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Part A, Section 1 of, and establish
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Part A, Section 2 Section 2 Nationa
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Part A, Section 2 2.2 Limitations o
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Part A, Section 2 17
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Part A, Section 2 Industrial: where
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• the sensitivity of the test con
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Part A, Section 3 23
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Section 2 Level of Ecological Prote
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Part B, Section 2 2.3 Endpoint Defi
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Part B, Section 2 There is consiste
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Part B, Section 4 Section 4 Potenti
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Part B, Section 4 Figure 4 Simplifi
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Figure 5 Key Receptors and Exposure
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Part B, Section 5 grazing herbivore
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Part B, Section 5 5.2.2 Maintenance
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Part B, Section 5 5.4 Industrial La
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Section 6 Uncertainty in Guidelines
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Section 7 Guidelines Derivation Pro
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Part B, Section 7 (SQG SG = soil qu
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Page 92 and 93: Where: NPER = no to Potential Effec
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Page 96 and 97: Part B, Section 7 data, the Median
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Page 100 and 101: Where: ERL = Effects Range Low, ECL
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Page 105 and 106: Part B, Section 7 Where the ECL lie
Page 107 and 108: Part B, Section 7 4. Fewer than thr
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Page 112 and 113: Part B, Section 7 Therefore, BCF =
Page 114 and 115: Part B, Section 7 ingestion (SQG I
Page 117 and 118: Section 8 Derivation of the Final E
Page 119 and 120: Part C, Section 1 65
Page 121 and 122: Part C, Section 1 various sites acr
Page 123 and 124: Part C, Section 1 Geographical unce
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Page 129 and 130: Part C, Section 2 Environmental con
Page 131 and 132: Part C, Section 2 extent, the steep
Page 133 and 134: Section 3 Exposure to Contaminants
Page 137 and 138: Part C, Section 4 Section 4 Exposur
Page 139: Part C, Section 4 within limits, th
Page 143 and 144: Part C, Section 4 4.2 Absorption of
Page 145 and 146: Part C, Section 4 In the case of no
Page 148 and 149: Residential/Parkland Land Use Sensi
Page 150 and 151: Part C, Section 4 Commercial Land U
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Page 155 and 156: Part C, Section 5 these data are av
Page 157 and 158: Part C, Section 5 GEOCHEM (Mattigod
Page 159 and 160: Part C, Section 5 • K oc (sorptio
Page 161 and 162: Part C, Section 5 5.3.3 Evaluation
Page 163 and 164: Part C, Section 5 parameters, and s
Page 165 and 166: Section 6 Derivation of the Final H
Page 167 and 168: Part D, Section 1 101
Page 169 and 170: does not apply to the commercial or
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Page 174 and 175: References Aldenberg, T., and W. Sl
Page 176 and 177: References -dwelling Organisms", Ab
Page 178 and 179: References 112
Page 180 and 181: References Hill, E.F., and D.J. Hof
Page 182 and 183: References Paustenbach, D.J., (1989
Page 184 and 185: References Summers, J.K., H.T. Wils
Page 186 and 187: Appendix A Appendix A Nutrient and
Page 188 and 189: Appendix A Figure A.1 Simplified Te
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Appendix A 4.1 Agricultural and Res
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Appendix A References Bååth, E.,
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The Subcommittee considers that exp
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Appendix B P l P r BW = percent pro
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Appendix B Substituting equation 5
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Appendix B Where no MRL exists, the
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Appendix B Then, the remainder (T R
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Appendix B For carcinogens, total i
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Appendix C Rearranging [2] and subs
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Appendix C References Chiou, C.T.,
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Appendix D uncontaminated organic m
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Appendix D R = recharge, m/yr A = a
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Appendix D 2.3.3 Hydraulic Gradient
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Appendix D 2.3.5 Site Length The le
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Appendix D Table D.2 Lower Quantile
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Figure D.2 Conceptual Model of Dilu
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Appendix D Figure D.3 Recharge Esti
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Appendix D 159
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Smith, A.E., P.B. Ryan, and J.S. Ev
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Appendix E C K L V is the climate f
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Appendix E contaminant concentratio
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Appendix F Appendix F Multi-media E
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Appendix F example, fish BCFs are t
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Appendix G 2.2 Contaminant Vapour T
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Appendix G Table G.1 Equations Used
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Appendix G at the outset that, rath
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Appendix G 4.4 Application of the R
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Average outdoor summer temperature
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Appendix G References Alberta Envir
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