Butanol, n- cleanup levels in Texas
- TCEQ
- TRRP Tier 1 PCLs
- CAS 71-36-3
- February 6, 2025
For Butanol, n-, TCEQ's Tier 1 table prints 8,200 mg/kg for TotSoilComb and 5.3 mg/kg for GWSoilIng (residential soil, 0.5 acre source area), and 2.4 mg/L for GWGWIng (residential groundwater).
- 8,200mg/kg 8.2E+03 TotSoilComb Table 1: Tier 1 Residential Soil PCLs 0.5 acre source area
- 5.3mg/kg 5.3E+00 GWSoilIng Table 1: Tier 1 Residential Soil PCLs 0.5 acre source area
- 2.4mg/L 2.4E+00 GWGWIng Table 3: Tier 1 Groundwater PCLs - Residential and Commercial/Industrial Residential
These are the Texas Commission on Environmental Quality's published values for Butanol, n-, from its Texas Risk Reduction Program Tier 1 Protective Concentration Levels, last revised February 6, 2025. Each value is shown as the agency prints it, with the same number written out beside it.
Texas: Texas Risk Reduction Program Tier 1 Protective Concentration Levels
Table 1: Tier 1 Residential Soil PCLs1
| Column | Value | Written out | note3 |
|---|---|---|---|
| TotSoilComb2 (mg/kg) | 8.2E+03 | 8,200 | n |
| GWSoilIng (mg/kg) | 5.3E+00 | 5.3 | n |
| GWSoilClass 3 (mg/kg) | 5.3E+02 | 530 | n |
| AirSoilInh-V4 (mg/kg) | ─ | ─ | |
| AirGW-SoilInh-V (mg/kg) | ─ | ─ | |
| GWSoil for Secondary MCL (mg/kg) | ─ |
| Column | Value | Written out | note3 |
|---|---|---|---|
| TotSoilComb2 (mg/kg) | 8.2E+03 | 8,200 | n |
| GWSoilIng (mg/kg) | 2.6E+00 | 2.6 | n |
| GWSoilClass 3 (mg/kg) | 2.6E+02 | 260 | n |
| AirSoilInh-V4 (mg/kg) | ─ | ─ | |
| AirGW-SoilInh-V (mg/kg) | ─ | ─ | |
| GWSoil for Secondary MCL (mg/kg) | ─ |
Footnotes to Table 1, as the agency prints them
1 In accordance with §350.72(b), when establishing Tier 1 PCLs for individual COCs for each of the individual and combined human health exposure pathways, the person must evaluate whether the PCLs need to be adjusted to lower concentrations to meet the cumulative carcinogenic risk level and hazard index criteria specified in §350.72(c). For COCs which exhibit both carcinogenic and noncarcinogenic characteristics, they shall be evaluated as both a carcinogen and noncarcinogen when determining whether the PCL established for an individual COC for each of the individual and combined human health exposure pathways needs to be adjusted to a lower concentration to meet the cumulative risk and hazard criteria. The person shall then use the lower of the carcinogenic or noncarcinogenic PCL as the Tier 1 human health PCL. In other words, the Tier 1 PCLs provided in this table for an individual COC should not be used as the final Tier 1 human health PCL for any of the individual or combined exposure pathways in cases where there are more than 10 carcinogenic and/or more than 10 noncarcinogenic COCs within a source medium unless it can be demonstrated that further downward adjustment is not necessary to meet the cumulative risk and hazard criteria.
2 Combined includes inhalation; ingestion; dermal; vegetable consumption pathways
3 c = carcinogenic; n = noncarcinogenic; m = primary MCL-based; e = EPA Action Level-based; > S = solubility limit exceeded during calculation
4 For subsurface soils only
5 Site-specific PCLs for mercury may vary based on the pH-dependent Kd value (see Figure:30 TAC §350.73(f)(1)(C)). Persons should use the Tier 1 pH 4.9-based PCLs unless a site-specific soil pH > 6.8 is demonstrated with site-specific soil samples.
6 Persons must use the value provided in the "GWSoil for Secondary MCL" column of this table as the GWSoil PCL for MTBE if the conditions described in §350.74(f)(3) exist.
7 Please see the note on nitrate/nitrite in the "List of Updates" spreadsheet for March 31, 2017.
8 This chemical is one of four chemicals that make up total trihalomethanes (TTHMs). USEPA has established an MCL for TTHMs of 0.08 mg/L. Each individual chemical that contributes to TTHMs must meet the 0.08 mg/L based GWSoilIng PCL, and the person must ensure that the total soil concentrations for all four will not impact groundwater above the GWGWIng based MCL.
9 Nitrate, nitrite, and ammonia are inorganic anions that are mobile in most environmental situations, quickly partitioning from soil to groundwater. Due to these partitioning characteristics it is difficult to calculate a reliable soil-water partition coefficient (Kd) and Henry’s law constant (H’) for these compounds. The Kd and H’ are parameters that are required to calculate the GWSoilIng PCL in accordance with 30 TAC 350.75(b)(1) using the Tier 1 GWSoilIng PCL equation.
* These compounds are not necessarily of concern from a human health standpoint, therefore calculation of human health-based values is not required. However, aesthetics and ecological criteria would still apply. See table entitled "Compounds for which Calculation of a Human Health PCL is Not Required" available on the TCEQ website at http://www.tceq.state.tx.us/remediation/trrp/trrp.html.
NA=Not applicable
All values capped at 1.0E+06
This table shows the residiential soil protective concentration levels for both 0.5 acre and 30 acre source areas
Table 2: Tier 1 Commercial/Industrial Soil PCLs1
| Column | Value | Written out | note3 |
|---|---|---|---|
| TotSoilComb2 (mg/kg) | 1.0E+05 | 100,000 | n |
| GWSoilIng (mg/kg) | 1.6E+01 | 16 | n |
| GWSoilClass 3 (mg/kg) | 1.6E+03 | 1,600 | n |
| AirSoilInh-V4 (mg/kg) | ─ | ─ | |
| AirGW-SoilInh-V (mg/kg) | ─ | ─ | |
| GWSoil for Secondary MCL (mg/kg) | ─ |
| Column | Value | Written out | note3 |
|---|---|---|---|
| TotSoilComb2 (mg/kg) | 1.0E+05 | 100,000 | n |
| GWSoilIng (mg/kg) | 7.9E+00 | 7.9 | n |
| GWSoilClass 3 (mg/kg) | 7.9E+02 | 790 | n |
| AirSoilInh-V4 (mg/kg) | ─ | ─ | |
| AirGW-SoilInh-V (mg/kg) | ─ | ─ | |
| GWSoil for Secondary MCL (mg/kg) | ─ |
Footnotes to Table 2, as the agency prints them
1 In accordance with §350.72(b), when establishing Tier 1 PCLs for individual COCs for each of the individual and combined human health exposure pathways, the person must evaluate whether the PCLs need to be adjusted to lower concentrations to meet the cumulative carcinogenic risk level and hazard index criteria specified in §350.72(c). For COCs which exhibit both carcinogenic and noncarcinogenic characteristics, they shall be evaluated as both a carcinogen and noncarcinogen when determining whether the PCL established for an individual COC for each of the individual and combined human health exposure pathways needs to be adjusted to a lower concentration to meet the cumulative risk and hazard criteria. The person shall then use the lower of the carcinogenic or noncarcinogenic PCL as the Tier 1 human health PCL. In other words, the Tier 1 PCLs provided in this table for an individual COC should not be used as the final Tier 1 human health PCL for any of the individual or combined exposure pathways in cases where there are more than 10 carcinogenic and/or more than 10 noncarcinogenic COCs within a source medium unless it can be demonstrated that further downward adjustment is not necessary to meet the cumulative risk and hazard criteria.
2 Combined includes inhalation; ingestion; dermal pathways
3 c = carcinogenic; n = noncarcinogenic; m = primary MCL-based; e = EPA Action Level-based; > S = solubility limit exceeded during calculation
4 For subsurface soils only
5 Site-specific PCLs for mercury may vary based on the pH-dependent Kd value (see Figure:30 TAC §350.73(f)(1)(C)). Persons should use the Tier 1 pH 4.9-based PCLs unless a site-specific soil pH > 6.8 is demonstrated with site-specific soil samples.
6 Persons must use the value provided in the "GWSoil for Secondary MCL" column of this table as the GWSoil PCL for MTBE if the conditions described in §350.74(f)(3) exist.
7 Please see the note on nitrate/nitrite in the "List of Updates" spreadsheet for March 31, 2017.
8 This chemical is one of four chemicals that make up total trihalomethanes (TTHMs). USEPA has established an MCL for TTHMs of 0.08 mg/L. Each individual chemical that contributes to TTHMs must meet the 0.08 mg/L based GWSoilIng PCL, and the person must ensure that the total soil concentrations for all four will not impact groundwater above the GWGWIng based MCL.
9 Nitrate, nitrite, and ammonia are inorganic anions that are mobile in most environmental situations, quickly partitioning from soil to groundwater. Due to these partitioning characteristics it is difficult to calculate a reliable soil-water partition coefficient (Kd) and Henry’s law constant (H’) for these compounds. The Kd and H’ are parameters that are required to calculate the GWSoilIng PCL in accordance with 30 TAC 350.75(b)(1) using the Tier 1 GWSoilIng PCL equation.
* These compounds are not necessarily of concern from a human health standpoint, therefore calculation of human health-based values is not required. However, aesthetics and ecological criteria would still apply. See table entitled "Compounds for which Calculation of a Human Health PCL is Not Required" available on the TCEQ website at http://www.tceq.state.tx.us/remediation/trrp/trrp.html.
NA=Not applicable
All values capped at 1.0E+06
This table shows the commerical/industrial protective concentration levels for 0.5 and 30 acre source areas
Table 3: Tier 1 Groundwater PCLs - Residential and Commercial/Industrial1
| Column | Value | Written out | note4 |
|---|---|---|---|
| GWGWIng2 (mg/L) | 2.4E+00 | 2.4 | n |
| GWGWClass33 (mg/L) | 2.4E+02 | 240 | n |
| AirGWInh-V 0.5 acre source area (mg/L) | ─ | ─ | |
| AirGWInh-V 30 acre source area (mg/L) | ─ | ─ |
| Column | Value | Written out | note4 |
|---|---|---|---|
| GWGWIng2 (mg/L) | 7.3E+00 | 7.3 | n |
| GWGWClass33 (mg/L) | 7.3E+02 | 730 | n |
| AirGWInh-V 0.5 acre source area (mg/L) | ─ | ─ | |
| AirGWInh-V 30 acre source area (mg/L) | ─ | ─ |
| Column | Value | Written out |
|---|---|---|
| Secondary MCL5 (mg/L) | ─ |
Footnotes to Table 3, as the agency prints them
1 In accordance with §350.72(b), when establishing Tier 1 PCLs for individual COCs for each of the individual and combined human health exposure pathways, the person must evaluate whether the PCLs need to be adjusted to lower concentrations to meet the cumulative carcinogenic risk level and hazard index criteria specified in §350.72(c). For COCs which exhibit both carcinogenic and noncarcinogenic characteristics, they shall be evaluated as both a carcinogen and noncarcinogen when determining whether the PCL established for an individual COC for each of the individual and combined human health exposure pathways needs to be adjusted to a lower concentration to meet the cumulative risk and hazard criteria. The person shall then use the lower of the carcinogenic or noncarcinogenic PCL as the Tier 1 human health PCL. In other words, the Tier 1 PCLs provided in this table for an individual COC should not be used as the final Tier 1 human health PCL for any of the individual or combined exposure pathways in cases where there are more than 10 carcinogenic and/or more than 10 noncarcinogenic COCs within a source medium unless it can be demonstrated that further downward adjustment is not necessary to meet the cumulative risk and hazard criteria.
2 based on primary MCLs when available
3 100 x GWGWIng
4 c = carcinogenic; n = noncarcinogenic; m = primary MCL-based; e = EPA Action Level-based; > S = solubility limit exceeded during calculation
5 The Secondary MCL values for ammonia and MTBE are based on taste and odor.
6 This chemical is one of four chemicals that make up total trihalomethanes (TTHMs). USEPA has established an MCL for TTHMs of 0.08 mg/L, so neither the individual concentration for any of these four chemicals can exceed the MCL, nor the total additive concentration of these four chemicals can exceed the MCL.
7 Dibenz-a,h-anthracene does not have an MCL. However, the relative potency factor for dibenz-a,h-anthracene is equal to the potency factor for benzo-a-pyrene and is treated like benzo-a-pyrene for groundwater pathways.
8 Persons must use the value provided in the "Secondary MCL" column of this table as the GWGWIng PCL for MTBE if the conditions described in §350.74(f)(3) exist.
9 Please see the note on nitrate/nitrite in the "List of Updates" spreadsheet for March 31, 2017.
* These compounds are not necessarily of concern from a human health standpoint, therefore calculation of human health-based values is not required. However, aesthetics and ecological criteria would still apply. See table entitled "Compounds for which Calculation of a Human Health PCL is Not Required" available on the TCEQ website at http://www.tceq.state.tx.us/remediation/trrp/trrp.html.
NA = not applicable
All values capped at 1E+06
This table shows the protective groundwater concentrations for residential and commercial/industrial land with 0.5 acre and 30 acre source areas
The agency's current table governs. This page is a reference copy and not a cleanup decision. Check the agency's page for a newer table before relying on a value.
Source
- Texas Commission on Environmental Quality, Texas Risk Reduction Program Tier 1 Protective Concentration Levels, last revised February 6, 2025. File read October 1, 2026.