{"query":{"parameter":"ethylene dibromide","place":"US-TX","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-TX","US"],"parameter_keys":["cas:106-93-4","cas:107-15-3","cas:1802633-48-2","cas:68650-50-0","cas:68475-96-7","cas:67989-30-4","cas:31295-49-5","cas:68845-16-9","cas:4062-60-6","cas:102-60-3","cas:198028-14-7","cas:64-02-8"],"names_matched":[["ethylene dibromide","cas:106-93-4"],["ethylene dibromide","cas:107-15-3"],["2 propenoic acid polymer with ethylenediamine oxirane methyloxirane 2 5 furandione methyl oxirane and oxirane","cas:1802633-48-2","ethylenediamine"],["c18 unsatd fatty acids dimers ethylenediamine polymers","cas:68650-50-0","ethylenediamine"],["fatty acids c18 unsatd dimers polymers with diethylenetriamine ethylenediamine sebacic acid and tall oil fatty acids","cas:68475-96-7","ethylenediamine"],["fatty acids c18 unsatd dimers polymers with ethylenediamine","cas:68650-50-0","ethylenediamine"],["fatty acids c18 unsatd dimers polymers with ethylenediamine hexamethylenediamine and propionic acid","cas:67989-30-4","ethylenediamine"],["n 2 aminoethyl n 2 1 piperazinyl ethyl ethylenediamine","cas:31295-49-5","ethylenediamine"],["n n bis 3 trimethoxysilyl propyl ethylenediamine","cas:68845-16-9","ethylenediamine"],["n n di tert butyl ethylenediamine","cas:4062-60-6","ethylenediamine"],["n n n n tetrakis 2 hydroxypropyl ethylenediamine","cas:102-60-3","ethylenediamine"],["octadecanoic acid 12 hydroxy reaction products with decanoic acid and ethylenediamine","cas:198028-14-7","ethylenediamine"],["sel tetrasodique de l acide ethylenediamine tetraacetique anhydrea","cas:64-02-8","ethylenediamine"]],"match":"exact+contains","order":"The place's own instruments first, then each place above it, each in its register's order"},"total":58,"offset":0,"returned":50,"next_offset":50,"rows":[{"id":"b94d4f88eca6abcc","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"2.5E+00","value_num":2.5,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","residential land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 1, Residential Soil, TotSoilComb, 0.5 acre source area","page":15,"quote":null}},{"id":"cd8db4297f114b1d","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"2.1E-04","value_num":0.00021,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","residential land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 1, Residential Soil, GWSoilIng, 0.5 acre source area","page":15,"quote":null}},{"id":"65bc2feed89120c5","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"2.1E-02","value_num":0.021,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","residential land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 1, Residential Soil, GWSoilClass 3, 0.5 acre source area","page":15,"quote":null}},{"id":"996571295aa02e18","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"1.3E+01","value_num":13,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","residential land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 1, Residential Soil, AirSoilInh-V, 0.5 acre source area","page":15,"quote":null}},{"id":"b3b4a0a6f215143e","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"3.1E+02","value_num":310,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","residential land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 1, Residential Soil, AirGW-SoilInh-V, 0.5 acre source area","page":15,"quote":null}},{"id":"ebb1a98c0fdf52b9","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"2.1E+00","value_num":2.1,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","residential land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 1, Residential Soil, TotSoilComb, 30 acre source area","page":15,"quote":null}},{"id":"18ef48aaa38b5754","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"1.0E-04","value_num":0.0001,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","residential land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 1, Residential Soil, GWSoilIng, 30 acre source area","page":15,"quote":null}},{"id":"86294e2f9003f4ac","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"1.0E-02","value_num":0.01,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","residential land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 1, Residential Soil, GWSoilClass 3, 30 acre source area","page":15,"quote":null}},{"id":"28d5478f5cefb628","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"6.8E+00","value_num":6.8,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","residential land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 1, Residential Soil, AirSoilInh-V, 30 acre source area","page":15,"quote":null}},{"id":"ac23590aec40e39d","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"2.0E+01","value_num":20,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","residential land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 1, Residential Soil, AirGW-SoilInh-V, 30 acre source area","page":15,"quote":null}},{"id":"9fe12e912a0e3cc2","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"8.7E+00","value_num":8.7,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 2, Commercial/Industrial Soil, TotSoilComb, 0.5 acre source area","page":30,"quote":null}},{"id":"ff77c80c02fc0f4f","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"2.1E-04","value_num":0.00021,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 2, Commercial/Industrial Soil, GWSoilIng, 0.5 acre source area","page":30,"quote":null}},{"id":"35f392eb2be03976","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"2.1E-02","value_num":0.021,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 2, Commercial/Industrial Soil, GWSoilClass 3, 0.5 acre source area","page":30,"quote":null}},{"id":"f2622e150598d78a","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"2.2E+01","value_num":22,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 2, Commercial/Industrial Soil, AirSoilInh-V, 0.5 acre source area","page":30,"quote":null}},{"id":"661759667118ec08","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"5.3E+02","value_num":530,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 2, Commercial/Industrial Soil, AirGW-SoilInh-V, 0.5 acre source area","page":30,"quote":null}},{"id":"44c024cd2145781a","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"6.3E+00","value_num":6.3,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 2, Commercial/Industrial Soil, TotSoilComb, 30 acre source area","page":30,"quote":null}},{"id":"977b4a6c8748713f","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"1.0E-04","value_num":0.0001,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 2, Commercial/Industrial Soil, GWSoilIng, 30 acre source area","page":30,"quote":null}},{"id":"a5d3504cef418200","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"1.0E-02","value_num":0.01,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 2, Commercial/Industrial Soil, GWSoilClass 3, 30 acre source area","page":30,"quote":null}},{"id":"f8cdd3c0e5d57d5f","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"1.1E+01","value_num":11,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 2, Commercial/Industrial Soil, AirSoilInh-V, 30 acre source area","page":30,"quote":null}},{"id":"a1d0a553f6913ce1","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"3.4E+01","value_num":34,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 2, Commercial/Industrial Soil, AirGW-SoilInh-V, 30 acre source area","page":30,"quote":null}},{"id":"ccbd4a21b2bb32d7","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"5.0E-05","value_num":0.00005,"unit":"mg/L","direction":"max","kind":"threshold","medium":"groundwater","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","residential land use"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 3, Groundwater, GWGWIng, Residential","page":43,"quote":null}},{"id":"31fa3432053d9481","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"5.0E-03","value_num":0.005,"unit":"mg/L","direction":"max","kind":"threshold","medium":"groundwater","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","residential land use"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 3, Groundwater, GWGWClass3, Residential","page":43,"quote":null}},{"id":"7d5b706167c88e24","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"7.6E+01","value_num":76,"unit":"mg/L","direction":"max","kind":"threshold","medium":"groundwater","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","residential land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 3, Groundwater, AirGWInh-V 0.5 acre source area, Residential","page":43,"quote":null}},{"id":"0f00c568786f39e0","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"9.8E+00","value_num":9.8,"unit":"mg/L","direction":"max","kind":"threshold","medium":"groundwater","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","residential land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 3, Groundwater, AirGWInh-V 30 acre source area, Residential","page":43,"quote":null}},{"id":"e6fd0d13e5db328f","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"5.0E-05","value_num":0.00005,"unit":"mg/L","direction":"max","kind":"threshold","medium":"groundwater","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","commercial/industrial land use"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 3, Groundwater, GWGWIng, Commercial/Industrial","page":43,"quote":null}},{"id":"5a599f1b9063c071","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"5.0E-03","value_num":0.005,"unit":"mg/L","direction":"max","kind":"threshold","medium":"groundwater","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","commercial/industrial land use"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 3, Groundwater, GWGWClass3, Commercial/Industrial","page":43,"quote":null}},{"id":"1dfa8e655525d819","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"1.3E+02","value_num":130,"unit":"mg/L","direction":"max","kind":"threshold","medium":"groundwater","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 3, Groundwater, AirGWInh-V 0.5 acre source area, Commercial/Industrial","page":43,"quote":null}},{"id":"f09cc7ceea75f74f","parameter":"Ethylene dibromide (dibromoethane, 1,2- )","value":"1.7E+01","value_num":17,"unit":"mg/L","direction":"max","kind":"threshold","medium":"groundwater","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 3, Groundwater, AirGWInh-V 30 acre source area, Commercial/Industrial","page":43,"quote":null}},{"id":"35f9cb52d3faa023","parameter":"1,2-Dibromoethane","value":"0.17","value_num":0.17,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["surface water designated or used for public drinking water supply, or a sole-source surface drinking water supply (30 TAC §307.6(d)(2)(A), Column A)"],"cite":{"instrument":"us_tx_wqs","title":"Texas Surface Water Quality Standards, 30 TAC Chapter 307 (2022): §307.6 Table 1 aquatic life (freshwater and saltwater acute/chronic) and Table 2 human health; §307.7 Table 3 dissolved oxygen","issuer":"State of Texas, Texas Commission on Environmental Quality (TCEQ)","edition":"2022 Texas Surface Water Quality Standards (Rule Project No. 2020-014-307-OW), effective June 27, 2025, as US EPA posts them (cover dated July 1, 2025) with what EPA has approved for CWA purposes","source_url":"https://www.epa.gov/system/files/documents/2023-12/txwqs-2022.pdf","source_sha256":"88ff93dcfb277feec248541b2aa9a0f01cd3a747cda6e03d958344ee4a34ce5e","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"30 TAC §307.6(d) Table 2","page":48,"quote":null}},{"id":"a48a7ad9b4af49b0","parameter":"1,2-Dibromoethane","value":"4.24","value_num":4.24,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:106-93-4","place":["US-TX"],"conditions":["surface water with a sustainable fishery not designated or used for public water supply (30 TAC §307.6(d)(2)(B), Column B); in an incidental fishery the criterion is ten times this value (30 TAC §307.6(d)(6))"],"cite":{"instrument":"us_tx_wqs","title":"Texas Surface Water Quality Standards, 30 TAC Chapter 307 (2022): §307.6 Table 1 aquatic life (freshwater and saltwater acute/chronic) and Table 2 human health; §307.7 Table 3 dissolved oxygen","issuer":"State of Texas, Texas Commission on Environmental Quality (TCEQ)","edition":"2022 Texas Surface Water Quality Standards (Rule Project No. 2020-014-307-OW), effective June 27, 2025, as US EPA posts them (cover dated July 1, 2025) with what EPA has approved for CWA purposes","source_url":"https://www.epa.gov/system/files/documents/2023-12/txwqs-2022.pdf","source_sha256":"88ff93dcfb277feec248541b2aa9a0f01cd3a747cda6e03d958344ee4a34ce5e","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"30 TAC §307.6(d) Table 2","page":48,"quote":null}},{"id":"3d949dc2bd4f3496","parameter":"Ethylenediamine","value":"7.4E+03","value_num":7400,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:107-15-3","place":["US-TX"],"conditions":["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.","residential land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 1, Residential Soil, TotSoilComb, 0.5 acre source area","page":15,"quote":null}},{"id":"25d85645eb29c4e3","parameter":"Ethylenediamine","value":"4.6E+00","value_num":4.6,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:107-15-3","place":["US-TX"],"conditions":["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.","residential land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 1, Residential Soil, GWSoilIng, 0.5 acre source area","page":15,"quote":null}},{"id":"5556291d644b89b3","parameter":"Ethylenediamine","value":"4.6E+02","value_num":460,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:107-15-3","place":["US-TX"],"conditions":["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.","residential land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 1, Residential Soil, GWSoilClass 3, 0.5 acre source area","page":15,"quote":null}},{"id":"bccc5b767a56be65","parameter":"Ethylenediamine","value":"7.4E+03","value_num":7400,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:107-15-3","place":["US-TX"],"conditions":["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.","residential land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 1, Residential Soil, TotSoilComb, 30 acre source area","page":15,"quote":null}},{"id":"61c00fa0d99f557f","parameter":"Ethylenediamine","value":"2.3E+00","value_num":2.3,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:107-15-3","place":["US-TX"],"conditions":["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.","residential land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 1, Residential Soil, GWSoilIng, 30 acre source area","page":15,"quote":null}},{"id":"2bdf26dd0043412e","parameter":"Ethylenediamine","value":"2.3E+02","value_num":230,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:107-15-3","place":["US-TX"],"conditions":["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.","residential land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 1, Residential Soil, GWSoilClass 3, 30 acre source area","page":15,"quote":null}},{"id":"87c327e140535b1a","parameter":"Ethylenediamine","value":"9.2E+04","value_num":92000,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:107-15-3","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 2, Commercial/Industrial Soil, TotSoilComb, 0.5 acre source area","page":30,"quote":null}},{"id":"b5e92804d69f48d0","parameter":"Ethylenediamine","value":"1.4E+01","value_num":14,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:107-15-3","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 2, Commercial/Industrial Soil, GWSoilIng, 0.5 acre source area","page":30,"quote":null}},{"id":"a5c6f1f92759f05a","parameter":"Ethylenediamine","value":"1.4E+03","value_num":1400,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:107-15-3","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 0.5 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 2, Commercial/Industrial Soil, GWSoilClass 3, 0.5 acre source area","page":30,"quote":null}},{"id":"6763197a300dc1ec","parameter":"Ethylenediamine","value":"9.2E+04","value_num":92000,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:107-15-3","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 2, Commercial/Industrial Soil, TotSoilComb, 30 acre source area","page":30,"quote":null}},{"id":"4a8f5db467a93735","parameter":"Ethylenediamine","value":"6.9E+00","value_num":6.9,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:107-15-3","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 2, Commercial/Industrial Soil, GWSoilIng, 30 acre source area","page":30,"quote":null}},{"id":"2b59af2c1b334324","parameter":"Ethylenediamine","value":"6.9E+02","value_num":690,"unit":"mg/kg","direction":"max","kind":"threshold","medium":"soil","level":"regional","parameter_key":"cas:107-15-3","place":["US-TX"],"conditions":["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.","commercial/industrial land use, 30 acre source area"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 2, Commercial/Industrial Soil, GWSoilClass 3, 30 acre source area","page":30,"quote":null}},{"id":"201278b66d40336c","parameter":"Ethylenediamine","value":"2.2E+00","value_num":2.2,"unit":"mg/L","direction":"max","kind":"threshold","medium":"groundwater","level":"regional","parameter_key":"cas:107-15-3","place":["US-TX"],"conditions":["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.","residential land use"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 3, Groundwater, GWGWIng, Residential","page":43,"quote":null}},{"id":"ecabf4d29b718b78","parameter":"Ethylenediamine","value":"2.2E+02","value_num":220,"unit":"mg/L","direction":"max","kind":"threshold","medium":"groundwater","level":"regional","parameter_key":"cas:107-15-3","place":["US-TX"],"conditions":["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.","residential land use"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 3, Groundwater, GWGWClass3, Residential","page":43,"quote":null}},{"id":"362a1c1d3272fb21","parameter":"Ethylenediamine","value":"6.6E+00","value_num":6.6,"unit":"mg/L","direction":"max","kind":"threshold","medium":"groundwater","level":"regional","parameter_key":"cas:107-15-3","place":["US-TX"],"conditions":["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.","commercial/industrial land use"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 3, Groundwater, GWGWIng, Commercial/Industrial","page":43,"quote":null}},{"id":"11685903b8ed502f","parameter":"Ethylenediamine","value":"6.6E+02","value_num":660,"unit":"mg/L","direction":"max","kind":"threshold","medium":"groundwater","level":"regional","parameter_key":"cas:107-15-3","place":["US-TX"],"conditions":["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.","commercial/industrial land use"],"cite":{"instrument":"us_tx_trrp_pcl","title":"Texas Risk Reduction Program (30 TAC Chapter 350): Tier 1 protective concentration levels — Table 1 Residential Soil, Table 2 Commercial/Industrial Soil, Table 3 Groundwater (residential and commercial/industrial)","issuer":"Texas Commission on Environmental Quality (TCEQ)","edition":"TRRP Tier 1 PCL tables, Last Revised: February 6, 2025 (TCEQ, PDF version)","source_url":"https://www.tceq.texas.gov/downloads/remediation/trrp/2025-pcl-tables-6-february-2025-final.pdf","source_sha256":"fb90ae0c95044f80cf21c83087ddbdc18ceee259ef8a6531887cc5c454d67686","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"TRRP Table 3, Groundwater, GWGWClass3, Commercial/Industrial","page":43,"quote":null}},{"id":"97d19ba27818c5e4","parameter":"1,2-Dibromoethane/Ethylene dibromide","value":"0.028","value_num":0.028,"unit":"mg/L","statistic":"composite","direction":"max","kind":"limit","medium":"product","level":"national","parameter_key":"cas:106-93-4","place":["US"],"conditions":["(a) Table UTS identifies the hazardous constituents, along with the nonwastewater and wastewater treatment standard levels, that are used to regulate most prohibited hazardous wastes with numerical limits. For determining compliance with treatment standards for underlying hazardous constituents as defined in § 268.2(i), these treatment standards may not be exceeded. Compliance with these treatment standards is measured by an analysis of grab samples, unless otherwise noted in the following Table UTS."],"cite":{"instrument":"us_40cfr268_48","title":"40 CFR 268.48 — Universal treatment standards: Table UTS, wastewater and nonwastewater treatment standards for the hazardous constituents of land-disposal-restricted wastes","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"eCFR, 40 CFR 268.48 as of 2026-10-13 (title 40 up to date as of that day; source note: 59 FR 48103, Sept. 19, 1994, as last amended at 76 FR 34156, June 13, 2011)","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-10-13/title-40.xml?part=268&section=268.48","source_sha256":"70b2e58a6b1e228e2c204acc69b69fab0d5a0347e35d569959073c3dc3ee4adb","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 268.48, Table UTS, Organic Constituents, wastewater standard","page":null,"quote":"1,2-Dibromoethane/Ethylene dibromide 106-93-4 0.028 15"}},{"id":"0c39b368381a29d8","parameter":"1,2-Dibromoethane/Ethylene dibromide","value":"15","value_num":15,"unit":"mg/kg","statistic":"instant","direction":"max","kind":"limit","medium":"product","level":"national","parameter_key":"cas:106-93-4","place":["US"],"conditions":["(a) Table UTS identifies the hazardous constituents, along with the nonwastewater and wastewater treatment standard levels, that are used to regulate most prohibited hazardous wastes with numerical limits. For determining compliance with treatment standards for underlying hazardous constituents as defined in § 268.2(i), these treatment standards may not be exceeded. Compliance with these treatment standards is measured by an analysis of grab samples, unless otherwise noted in the following Table UTS."],"cite":{"instrument":"us_40cfr268_48","title":"40 CFR 268.48 — Universal treatment standards: Table UTS, wastewater and nonwastewater treatment standards for the hazardous constituents of land-disposal-restricted wastes","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"eCFR, 40 CFR 268.48 as of 2026-10-13 (title 40 up to date as of that day; source note: 59 FR 48103, Sept. 19, 1994, as last amended at 76 FR 34156, June 13, 2011)","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-10-13/title-40.xml?part=268&section=268.48","source_sha256":"70b2e58a6b1e228e2c204acc69b69fab0d5a0347e35d569959073c3dc3ee4adb","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 268.48, Table UTS, Organic Constituents, nonwastewater standard","page":null,"quote":"1,2-Dibromoethane/Ethylene dibromide 106-93-4 0.028 15"}},{"id":"5bbcaacd5f8787af","parameter":"Ethylene dibromide","value":"0.00005","value_num":0.00005,"unit":"mg/l","direction":"max","kind":"limit","medium":"drinking_water","level":"national","parameter_key":"cas:106-93-4","place":["US"],"conditions":["40 CFR 141.2: Maximum contaminant level means the maximum permissible level of a contaminant in water which is delivered to any user of a public water system."],"cite":{"instrument":"us_npdwr","title":"40 CFR Part 141 — National Primary Drinking Water Regulations (eCFR, as of 2026-08-01)","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=141","source_sha256":"bd534eb2d8af38e141e1cd6236134a638298fbf14791b30279eeb47d815d7767","fetched_at":"2026-08-29","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"141.61","page":null,"quote":null,"column":"mcl"}},{"id":"e6454a58cecffc51","parameter":"Dibromoethane, 1,2-","value":"0.036","value_num":0.036,"unit":"mg/kg","direction":"max","kind":"guideline","medium":"soil","level":"national","parameter_key":"cas:106-93-4","place":["US"],"conditions":["Resident Soil (mg/kg)"],"cite":{"instrument":"us_rsl_soil","title":"US EPA — Regional Screening Levels (RSLs), Summary Table (TR=1E-06, THQ=1.0), November 2024 — Soil","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"November 2024","source_url":"https://semspub.epa.gov/src/document/HQ/405270","source_sha256":"0160dc81b4f55d738a354a74de92488f149946ebfa7c6a6c64592f45348043d7","fetched_at":"2026-09-19","source_status":{"checked":"2026-10-15","status":"not verified"},"section":null,"page":null,"quote":null,"table":"sols","column":"residentiel"}}],"next":[{"tool":"check_values","says":"Has your user measured this? check_values sets each of their results beside every row held here, with a verdict and the row's cite.","arguments":{"place":"US-TX"},"needs":{"rows":"Your user's measured results, as their table prints them: [{parameter: \"ethylene dibromide\", value, unit}, ...], any other parameters too."},"post":"/api/v1/check"},{"tool":"read_certificate","says":"Has your user a laboratory certificate? read_certificate reads every row it prints, each with its page, and checks them against these limits.","arguments":{"place":"US-TX"},"needs":{"content_base64":"The laboratory's certificate (PDF) or its XLSX, XLS or CSV export, as base64; or file_url, a public https address of it."},"post":"/api/v1/certificate"}]}