Examples of medium-specific concentrations (MSC), standards, and criteria
for health-based closure/remediation (see §335.558 of this title (relating
to Medium Specific Concentration of Risk Reduction Standards Number 2.))
Attached Graphic
(1) Concentrations for constituents are expressed in scientific
notation. Examples 2.20E-00 = 2.2; 2.20E+02 = 220; and 2.20E-01 = 0.22.
(2) The development of final cleanup levels may involve other
factors as described in this subchapter, such as cumulative health effects,
that are not considered in this chapter.
(3) Groundwater concentrations are based on maximum contaminant
levels (MCLs) or the formula and parameters for residential use of groundwater
which are contained in §335.567 of this title (relating to Appendix
I). For nonresidential exposure conditions, the groundwater concentrations
are calculated using the procedures of §335.559(d)(2) or (3) of this
title (relating to Medium Specific Requirements and Adjustments for Risk Reduction
Standard Number 2).
(4) For some constituents, the practical quantitation limit
(PQL) may be the appropriate groundwater MSC as described in §335.555(d)(1)
of this title (relating to Attainment of Risk Reduction Standard Number 2:
Closure/Remediation to Health-Based Standards and Criteria). See 40 Code of
Federal Regulations Part 264 (Appendix IX) for a list of groundwater PQLs.
(5) Residential soil groundwater protection concentrations
are based on a multiplication factor of 100 times the groundwater MSC.
(6) Industrial soil groundwater protection concentrations are
based on a multiplication factor of 100 times the MCL or, when an MCL is not
available, a factor of 100 times the groundwater concentration calculated
using the formula and parameters which are contained in §335.559(d)(2)
or (3) of this title (relating to Medium Specific Requirements and Adjustments
for Risk Reduction Standard Number 2).
(7) Residential soil concentrations (maximum) are calculated
using the formula and parameters for residential land use which are contained
in §335.567 of this title (relating to Appendix I). The person must also
demonstrate that groundwater is protected and that no nuisance conditions
exist (§335.559(a)-(h) of this title (relating to Medium Specific Requirements
and Adjustments for Risk Reduction Standard Number 2)).
(8) Industrial soil concentrations (maximum) are calculated
using the formula and parameters for industrial land use which are contained
in §335.567 of this title (relating to Appendix I). The person must also
demonstrate that groundwater is protected and that no nuisance conditions
exist (§335.559(a)-(h) of this title (relating to Medium Specific Requirements
and Adjustments for Risk Reduction Standard Number 2)).
(9) The final, proposed or listed MCL, from the Federal Safe
Drinking Water Act, §146. For lead, the action level for lead in drinking
water is used as the MSC.
(10) All concentrations were calculated using data from the
Integrated Risk Information System (IRIS) Chemical Files, or data from the
Health Effects Assessment Summary Tables (HEAST), developed by the United
States Environmental Protection Agency, Office of Research and Development
and Office of Health and Environmental Assessment, Washington, D.C. 20460.
The toxicity information, and the MSCs, will be updated as new information
becomes available.
(11) In some cases, an oral reference dose (RFD) or an oral
slope factor (SF) was substituted for the inhalation RFD or inhalation SF
in calculating MSC. This MSC will be updated when this information becomes
available.
(12) The MSCs calculated for this compound are based on noncarcinogenic
effects. The following formula was used for calculating the soil MSCs: MSC
= [(oral RFD)(Body Weight)(ED)(365 days/yr)]/[(EF)(ED)(IR)(CF)]. For residential
soils, the following exposure factors were used: BW = 15 Kg; ED = 5 years;
EF = 350 days/year; IR = 200 mg/day. For industrial soils, the following exposure
factors were used: BW = 70 Kg; ED = 25 years; EF = 250 days/year; IR = 100
mg/day. In both cases, the CF is 0.000001 kg/mg. When oral slope factors become
available, these MSCs will be revised.
(13) As described in §335.559(e) of this title (relating
to Medium Specific Requirements and Adjustments for Risk Reduction Standard
Number 2), the sum of concentrations of the volatile organic compounds in
vapor phase in soil shall not exceed 1,000 ppm by weight or volume.
(14) The MSC for lead in soil is based on values calculated
by the United States EPA using the Lead Uptake/Biokinetic Model, Version 0.4,
which has been developed by the United States EPA Office of Health and Environmental
Assessment.
(15) Soil MSCs for polychlorinated biphenyls are based upon
the 4/2/87 TSCA regulations, 40 Code of Federal Regulations §761.125
(see 52 FedReg 10688).
(16) NHHB = Not Human Health Based. The SAI-Ind MSC for this
compound exceeds 10e+6 ppm, which means it is not toxic to humans when exposed
to soils under these assumptions. Persons must consider other criteria of §335.559
of this title (relating to Medium Specific Requirements and Adjustments for
Risk Reduction Standards Number 2) to develop numeric cleanup values.
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