Texas Administrative Code › Title 30 - ENVIRONMENTAL QUALITY › Part 1 - TEXAS COMMISSION ON ENVIRONMENTAL QUALITY › Chapter 335 - INDUSTRIAL SOLID WASTE AND MUNICIPAL HAZARDOUS WASTE › Subchapter S - RISK REDUCTION STANDARDS › Section 335.568 - Appendix II

Current through Reg. 49, No. 28; July 12, 2024
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.