April 20, 2023 khan US Environmental Protection Agency (EPA) chuan Toxic Substances Control Act (TSCA) Section 6(a) hnuaia methylene chloride hman tam zawk khapna dan siam tura ruahmanna siam a nih thu a puang. EPA chuan dichloromethane atana a risk assessment dik lo chu hnathawkte, professional non-users (ONUs), consumer-te leh consumer hmanna hnaih berte nena inzawm risk vang a nih thu a sawi. Environmental Protection Agency chuan methylene chloride inhnim leh vunah hian mihring hriselna a nghawng tha lo thei tih a hmuchhuak a, chung zingah chuan neurotoxicity, liver-a nghawng leh cancer te pawh a tel. EPA chuan risk management rule an siam tum hian consumer zawng zawng leh industrial leh commercial hmanna tam zawk tana methylene chloride siamchhuah, processing leh distribution chu “rang takin a tihtlem” dawn tih a sawi a, a tam zawk chu thla 15 chhungin a taka tihhlawhtlin a ni ang, a ti. EPA chuan dichloromethane hman tam zawkah chuan khap a rawt dawn tih a sawi. Analysis atanga a lan dan chuan dichloromethane aia hmanraw dang, a man leh a thatna inang chiah chiah chu a tlangpuiin a awm thei a ni. Rule ruahman hi Federal Register-ah tihchhuah a nih hnuah ni 60 chhung comment period tan a ni ang.
TSCA Section 6(b) hnuaia dan siam tum draft version hnuaiah chuan EPA chuan methylene chloride hian hriselna atana hliam hlauhawm tak a thlen tih a rel a, chu chu senso emaw, hlauhawm lo dang emaw ngaihtuah lovin, 2020 methylene chloride risk assessment-a inhriatthiamna nei thei emaw, hlauhawm thei emaw nia hriatte tan unreasonable risk in conditions use (COU) te pawh a tel a ni. Risk awm lo tihbo nan EPA chuan TSCA Section 6(a) angin:
EPA chuan dichloromethane atana TSCA COU zawng zawng (consumer paint leh paint remover-a hman a nih loh chuan, TSCA Section 6 (84 Fed. Reg. 11420, March 27, 2019) hnuaia a hrana thawk) chu he offer hnuaiah hian a awm vek tih a sawi. EPA sawi dan chuan TSCA chuan COUs chu chemical pakhat chu sumdawnna atana siam, tihfel, sem chhuah, hman, emaw paih chhuah a nih theihna tura thil awm dan beisei, hriat, emaw, a remchan dan anga hmuh theih emaw tihna a ni. EPA chuan he rawtna chungchangah hian kawng hrang hrangah mipui ngaihdan a ngen a ni.
EPA press release-in a tarlan danin, EPA chuan dan siam tura Occupational Safety and Health Administration (OSHA) nen an inrawn a, “hnathawktute humhalhna tur ruahmanna siamnaah OSHA thil mamawh awmsa te chu a ngaihtuah bawk.” risk awmze nei lo tihbo nan thil tulte. EPA-in risk management rules hnuhnung ber a tihchhuah hnuah employer-te chuan WCPP zawm turin kum khat hun an nei dawn a, hnathawkte chu methylene chloride an tawrh loh nan an hnathawhna hmunte chu enfiah reng a ngai dawn a, hei hian risk awm lo tak a thlen thei a ni.
EPA chuan “mipuite chu dan siam tura ruahmanna siam hi enfiah a, an ngaihdan pe turin a ngen a ni.” EPA chuan “a bik takin hnathawkte humhalhna atana ruahmanna siamte tih theih leh tangkai dan tur chungchanga programme ruahman kalpui tura pawl hrang hrangte ngaihdan ngaihthlak a duh hle” a ti. EPA, kar leh lamah chuan hnathawhna hmun leh hnathawkte tan open webinar a buatsaih dawn a, “mahse, ruahmanna siamte sawihona atana regulatory measures ruahmante thlirletna zawngtu tan chuan a tangkai hle ang.”. .
Bergeson & Campbell, PC (B&C®) chuan EPA-in methylene chloride control dan tur leh control option lian tham a ruahmante kalna tur a sawi lawk a ni. EPA-in rule a rawt hi chrysotile risk management rule draft ruahman-a a rawtnate nen a inmil a, chutah chuan hman khapna tura regulatory measures rawt te, TSCA Section 6(g) hnuaia hun bituk chhunga hman theihna tur regulatory alternative pawimawh tak tak (eg, national security leh critical infrastructure) leh tuna chemical exposure limits (ECELs) awm mek, tuna occupational exposure limits aia hniam zawk rawtna te pawh a tel a ni. A hnuaia tarlan ang hian, regulated community member-te’n dan siam tura ruahmanna siam chungchanga mipui ngaihdan an buatsaih huna ngaihtuah tur thil engemaw zat kan tarlang a, mi zawng zawng chu thil awmdanah regulatory activity chungchanga hriattirna pe turin non-regulated hmalaknaah EPA nena inzawmna hmasa ber neih a pawimawhzia kan hriat nawn tir a ni. Regulations, TSCA pawh a tel.
EPA-in “whole chemicals” approach hmanga policy kaihhruaina thar a kalpui dan ngaihtuah chuan, EPA-in regulatory action a rawt chu “industrial leh commercial lama dichloromethane hman tam zawk khap” a ni tih hi mak kan ti lo. Mahse, EPA chuan regulatory alternative lian tak a pe a, chu chuan hman khap tum ṭhenkhat chu WCPP zawm a nih hnuah hman chhunzawm zel a phalsak a ni. Hei hi kan sawi chhan chu TSCA Section 6(a)-ah chuan EPA chuan “chemical emaw, mixture emaw chuan chutiang hlauhawmna a thlen tawh loh nan a tul angin hlauhawmna awm lo tihbo nan thil tulte chu a hmang tur a ni” tih a sawi vang a ni. ECEL nena WCPP hian EPA-in a sawi angin hriselna leh boruak a humhalh a nih chuan hmanna thenkhat khapna hian “degree of necessity” dan a pel niin a lang. WCPP hi venhimna ni mah se, consumer hman khapna awmsa chu a la dik a ni, a chhan chu consumer-te chuan WCPP-a venhimna zawm dan an lantir thei lo thei a, an document thei lo mai thei bawk. A lehlamah chuan hnathawhna hmun chuan WCPP thil phut zawm a nihzia a lantir thei a, a document thei a nih chuan chutiang hman chu phalsak chhunzawm zel a nih a rinawm.
WCPP thil phut angin EPA chuan “Good Laboratory Practice [GLP] 40 CFR Part 792′′ zawm a ngai dawn tih a sawi a, he thil phut hi Industrial Hygiene Laboratory Accreditation Programme (IHLAP) standard angin hnathawhna hmuna enfiahna hmalakna tam zawk nen a inmil lo hle a ni.EPA-in hnathawhna hmuna enkawlna atana GLP testing atana a beisei chu testing order nen a inmil a ni kum 2021-a tihchhuah a ni a, mahse a standard consent order erawh a ni lo Entirnan, EPA TSCA Section 5(e) order template-ah chuan Section III.D-ah hian a hnuaia mi ang hian a tarlang a ni.
Mahse, he Chemical Exposure Limits section tharah hian TSCA GLP zawm a ngai lo va, hetah hian analytical methods chu laboratory-in a pawm a, chu chu: American Industrial Hygiene Association (“AIHA”) Industrial Hygiene Laboratory Accreditation Program (“IHLAP”)-in a pawm a ni. emaw, EPA-in ziaka a pawmpui program dang ang chi emaw a ni thei bawk.
EPA chuan dan siam tum chungchangah hian thil chiang tak tak chungchangah ngaihdan a dil a, hei hi B&C chuan a nghawng thei turte ngaihtuah turin a rawt a ni. Entirnan, EPA chuan TSCA Section 6(g) hnuaia thuneihna, civil aviation ang chi hmanna tur condition thenkhatah hun bituk chhunga exemption pek dan tur a sawiho mek a, EPA chuan thil tul ruahmante zawm chuan “infrastructure pawimawh tak tak chu nasa takin a tibuai dawn a ni” tiin a sawi. “He waiver hian WCPP zawm a huam dawn tih kan hre bawk Chutiang bawkin, WCPP hi venhimna a nih a, facility hian WCPP a zawm thei a nih chuan (eg chronic non-cancerous ECEL 2 parts per million (ppm) leh short term exposure limit (STEL) 16 parts per million), he term hi hriselna leh boruak humhalhna atana thil tul aia tam a ni tih kan ring Safeguards a nih hunah exemption hman a ni ang risk hmachhawn tur tling lo leh khapna hian sector pawimawh tak takte (eg. defence, aerospace, infrastructure) nasa takin a tibuai dawn a ni ngaihdan a nih chuan EPA Section 6-a thupek a tlin lo.
EPA chuan kum 2022-a paper siam, “Evaluation of Alternatives to the Use of Dichloromethane” (rule siam tura rawtna siamah hian reference 40) tih chu rule ruahman chhung zawng hian a tarlang a ni. He tehna atanga chhut chuan EPA chuan “dichloromethane aia endpoint hazard screening ratings thenkhat hniam zawk leh dichloromethane aia hazard screening rating sang zawk nei ingredient thenkhat nei product a hmuchhuak (ref. 40)” tiin a sawi. He commentary siam lai hian EPA hian he document hi Rulemaking Checklist-ah a upload lo va, EPA pawhin a online Health and Environment Research (HERO) database-ah a dah lo bawk. He document chipchiar zawka zir chian loh chuan hmanna apiangah a danglamna tur a remchan leh remchan loh teh theih a ni lo. Paint stripping ai chuan solvent angin hna a thawk lo thei a, chu chu thlawhna chhunga electronic component sensitive tak takte tihfai nan hman thin ang chi te hi a ni.
A chungah hian documentation awm lohna kan sawi a, a chhan chu EPA khapna ruahman avanga nghawng nei pawlte chuan he information hi an mamawh dawn a, chu chu thil dang hman theih dan tur technical feasibility hriat chian nan, alternative tha tak takte (nakin lawka TSCA regulatory action a thlen thei tur)-a hlauhawm awm thei te tehna atan leh mipui ngaihdan atana inbuatsaih nan a ni. . US EPA chuan chrysotile rule a siamah hetiang “alternative” chungchang hi a sawiho tih kan hmu a, chutah chuan US EPA-in chlor-alkali industry-a hman tur diaphragm-a chrysotile hman khap a tumna pawh a tel a ni. EPA chuan “chlor-alkali siamna atana asbestos awmna diaphragm siamna atana technology dangte chuan asbestos nei diaphragm-a PFAS compound awm zat nen khaikhin chuan perfluoroalkyl leh polyfluoroalkyl substance (PFAS) concentration a sang zawk tih a pawm a, mahse a danglamna awm thei tur hlauhawm leh hlauhawmna chu a khaikhin belh lo.
A chunga kan sawi tak risk management chungchang bakah hian US Environmental Protection Agency-in dichloromethane nena inzawm risk awm thei a zirchiannaah hian dan lama inthlauhna lian tak a la nei niin kan ring. Nov. 11, 2022-a kan memo-a kan sawi tawh angin, EPA chuan a mawhphurhna hlen chhuahna atana a bulpui atan kum 2018-a document “Applying Systematic Analysis to TSCA Risk Assessment” (“2018 SR Document”) tih chu a hmang tih a sawi fo thin. Requirement hian TSCA Section 26(h) leh (i)-a tarlan angin scientific data awm tha ber ber leh scientific evidence a hmang a ni. Entirnan, EPA chuan methylene chloride chungchanga dan siam tura a rawtnaah heti hian a sawi:
EPA chuan dichloromethane ECEL hi TSCA Section 26(h) hnuaia science awm tha ber aiawhtuah a ngai a, a chhan chu kum 2020-a dichloromethane risk assessment atanga information hmuh atanga lak chhuah a nih vang a ni a, hei hi uluk taka systematic analysis neih atanga lo chhuak a ni. hriselna lama nghawng ṭha lo awm thei tur kaihhnawih hriat theihna turin examination neih a ni. [underline] a ni.
Kan ziah tawh ang khan National Academies of Sciences, Engineering and Medicine (NASEM) chuan EPA ngenna angin kum 2018 SR document chu an enfiah a, hetiang hian thutlukna an siam a ni:
OPPT-in systematic review a kalpui dan hian thil tak tak chu a lantir tawk lo va, [leh] OPPT chuan systematic review-a a kalphung chu ngaihtuah nawn leh se, he report-a thuziak leh rawtna awmte hi a ngaihtuah tur a ni.
Chhiartute chu TSCA Section 26(h) chuan EPA chu TSCA Section 4, 5, leh 6 angin science awm thei tha ber angin thutlukna siam turin a ti a, chutah chuan protocol leh method hrang hrang systematic review te pawh a tel a ni. Chu bakah, EPA-in dichloromethane risk assessment hnuhnung berah 2018 SR document a hman dan hian EPA-in TSCA Section 26(i)-a scientific evidence requirement tarlan a zawm leh zawm loh chungchangah rinhlelhna a siam bawk a, hei hi EPA chuan evidence atan emaw, deterministic angin emaw “systematic analysis approach” anga a classified a ni. ...” tiin a sawi.
TSCA Section 6(a) hnuaia EPA-in dan a siam pahnih, Chrysotile leh Methylene Chloride te chuan EPA-in chemical lian 10 dang, EPA-in a chhan awm lo anga a ngaihte risk management rules a siam tur dan a siam a ni. Risk assessment hnuhnung berah hian ngaihtuahna thenkhat hman a ni. Heng thil hmangtu industry te hian ban lo awm tur, WCPP, emaw WCPP zawm ngai hun bituk chhunga exemption emaw atan an inbuatsaih tur a ni. B&C chuan stakeholder-te chu methylene chloride regulation ruahman chu ennawn leh turin a rawt a, chhiartuten methylene chloride an hmang lo a nih pawhin, ngaihdan dik tak pe turin a rawt a, methylene chloride atana risk management option ruahmante chu nakin lawka EPA standard dangte zinga mi a nih a rinawm thu a hria a ni. dan siam a ni. Risk assessment hnuhnung ber nei chemical (eg 1-bromopropane, carbon tetrachloride, 1,4-dioxane, perchlorethylene leh trichloroethylene).
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