Document LK03DvGOL9pNGxEXzawNX4XaX

Mas* CHEMICAL MANUFACTURERS ASSOCIATION January 17, 1984 To: From: Re: Vinyl Chloride Program Panel C. Stack NESHAP FederaT"Register Notice I enclose a recent Federal Register notic announcing EPA's conclusions following review of the current vinyl chloride emission standard. The announcement proposes administration changes and contains EPA's decisions regarding certain aspects of the standard. No major revisions are proposed. CMA 007804 -7 1 Formerly Manufacturing Chemists Association--Serving the Chemical Industry Since 1872 2501 M Street, NW Washington, DC 20037 Telephone 202/887-1100 Telex 89617 (CMA WSH) 4 VS.!~ No. 8 / Wednesday. Innuag 8. 19fift / Prqpqag4,,Rqfos p. ENVIW^EMTAtPfHJTICTWH * 4ocm^wti [AO-ntL-Z707*41 , . - i flallonri fmleeion Hnitanla liw Hanrdoua Air Paikitantac Vinyl CNorMe ,, amncv. EnvoronmenUl Protection Agency (EPA). action: Proposed rule nd notice of public hearing.______________ usmsamr The current emission standard for vinyl chloride (VC) was promulgated under Section 112 of the Clean Air Act in 1876. A review of the technological basi* and administrative aspects of the standard has been completed, and the conclusions of the review are presented in this notice The conclusions are the basis for this action which (1) proposes administrative and clarifying revisions,to the standard and (2) announces decisions pertaining to other aspects of the current standard. '. This notice also withdraws proposed revisions to the current standard which were published in the Federal Register on )une 2.1977 (42 FR 26154). If requested, a public hearing will be held to provide interested persona an opportunity- for oral presentations of data, views, or arguments concwWng the proposed revisions to the qunsnt standard. DATim Comments. Comments mtmt he received on or before March 25.1865. Public Hearing. If anyone contacts ill* EPA requesting to speak gt a public hearing by lanuarySOlM*, e petite hearing will be held on February 65, 1985 beginning at 9*M a.m. Parsons interested hratlemHng*e hearing should call Ms. Shelby Journigaa et (9l9) 541-5578 to verffythat is hearing frill occur. Request to Speak at Hearing. Parsons wishing to present oral testimony must contact EPA by January 6ft 1868. Incorporation by Reference. The incorporation by inference of (jartain publications in thaw standards wili be approved by the Director of the Federal Register es of the data of tbe final rule, spowaeaaa. Comment*. Comments should be submitted (in duplicate if possible) to: Centra] Dockbt Section (A130). Attention Docket Number Ar-81-21. UA Environmental Protection Agency. 401M Street S.W., Washington. D.C 20480i Public Hearing. If anyone contacts the EPA requesting to speak at a public hearing by January 30,1888. the public hearing will be held at EPA-Auditorium. corner of Highway 54 and Alexmder ltadt for relief valve discharges. (2) Drive. Research Triangle Park, NMi pwvidlng a compliance test procedure Caselias. Arsons interested in ntlandiiig and a specific emission limit for the hearing should call Ms. Shetay version who perform stripping Joumigan at (819) 541-5578 to verify that iterations in reactors, and (3) specifying a hearing will occur. Persona wtriilng te raquirements for lank detection and present oral testimony should,notify Ms. repair propams for certain equipment in Shelby foumigan. Standards' VC service. Additional minor Development Branch (MD-13). X3&. administrative change* to the standard Enviromantal Protection Agency; era being propoaed and are explained Research Triangle Park, North Carolina taler ip this premable. " 27711, telafigLone number (919) S4W578. Summary ofHealth. Envimnmenlpl. Background Information Document The general findings o3he review study ere documented in "VSyl Chlaride--A Review of National Emission standards". EPA-450/3-82-003 (NTIS- PB 84-114384). available front'fie National Technical Information Ban Its. 5285 Port Royal Road. Springfield Aergy. andEconomic Impacts- Sincejpo major revisions to the standard are being proposed, the impacts resulting Rom the current standard remain generally unchanged. In 1975, it was estimated that emissions of VC from planto producing ethylene dichloride (EDC), VC monomer and polyvinyl Virginia 22181. The major W'fciinJ analysis for the review study is rtalorida (PVC) would be reduced from .000 Mg/yr to 4.910 Mg/yr under the contained in a separate document which current standard, representing an may be obtained from the U.S.EPA amission reduction of 91.000 Mg/yr of Library (MD-3S), Reward Triangle VC (or 95 percent of VC emissions). Park, North Carolina 27711. telephone Emissions of volatile organic compounds number (819) 541-2777. Pleeae refer to . (VOC) and EDC are also reduced under "Vinyl Chloride: Relief Valve Ofocharga the standard. Standard." EPA-45O/3-85-00Z. for tbs technical document Docket. Docket No. A-81-21, , containing supporting information used in developtag the proposed standard, is available for public inspection and, aopytaf hstwami 8:00 a.m. and 4:00 p.m Monday throng Friday, at EPA's Central Docket Section, West Tower Lobby. Gallery 1. Waterside Mafl, 481M Street 9W,, Washington, D.G 2D480. A reasonable fee may be charged for _____ _______ The estimated risks attributed to exposure to VC from EDC/VC andLPVC plants in operation prior to the current standard were 5J cases per year for Uver angiosarcoma and 11 cases per year for all cancers. The risks athibuted to exposure to VC fnmjtources under the current standaioaave been to be028 cases per year for Ever angiosarcoma and 0.55 cases per year for ell cancers. In 1975, estiihsteicapital cost for existing plants tqjneet the VC standard ran wnm jnfonssation umiscc was 1196 million, of which $15 million Robert E. Rosenateel or Mr. Lailte B. waa for EDC iqiitvC monomer plants Evaom. (81S) 581-5071. concerning and Sl83jniItion was for PVC plants. techpteal aapeota of the industry and The EP&*itiinata^ fhat the annualized control technologies, and Mr. md Dtmmk*cedr.CUb4rt KWoeitfSO* coat (including capital amortization, etc.) to these plants fo mamtain.tha required 541-5578. concerning regulatory mniaaionleyefa would be |70 mjllion per decisions. The address rot the** contacts is Emission Standards and Engineering Division (MD-13), ILS. . ' Environmsntal Protection Agency. The VC standard was proposed on Research Triangle Park. North CawHria December 24.1975 [40 FK 59332), and 27711. promulgated on October 21,1976 (41Fr -4Mta.it la applicable to plants pataritag EDC by the reaction of exygw and hydrogen chloride with ethylene, plants producing VC by any Revisions. Several edministHttaa process, and plants producting one or changes are being proposed eseeawR more polymers containing any fraction of a review of the national antiaatan _ of VC Thaw plants are subject to standard for VC No oujor mkrions aw.; -different requirements at numerous VC being proposed to the eternised As wdh wiission points in t&e'manufacturing the current standard for VC tan process. These requirements include revisions are being sstabiisbedwdir auMIcal emission limits, equipment Section 112 of the Clean Air Ant Tbe apecfibations. and work practices. signifi&nt administrative revtataaa . The standard was designed to include: (l) Reformatting the wtaataa. -minimize the health risks associated 007B0S Fdnl / VqL SO. Now / with VC by requiring reasonable control measure*. Ai stated in the preamble ta the proposed standard (40 ft 10832, December Z4.1973), there la ao known threahold level of effects for VC Therefore, the only approech that would eliminate health risks gaaodated with' VC would ban ita production and uaa. Thia approach was not selected. Rather, an approach waa aelected to minimiTM the health riaka associated with VC by uae of reaaonable control meaaure. On November 10.1878, the `____ Environmental Defense Fund (Q1F) petitioned the United States Court of Appeele for the District of Columbia Circuit to review the standard. On March 24. 1977. the EOF and the EPA moved to dismiss the proceedings on the basis of a settlement agreement requiring the EPA to propose amendments which would requite increased efficiency of existing control equipment require more stringent control of new sources, and prohibit increases in emissions within the vicinity of an existing source doe to new construction. Hie preamble to the proposed amendments waa to state that the EPA's policy for regulating carcinogens under Section 112 of the Clean Air Act would include a general goal of eliminating emissions of carcinogens and that the EPA would initiate a review of the VC standard 3 years after the promulgation of die amendments. On June 2.1977, the amendments were proposed (42 FR 28154). Many comments pertaining to policy, technological feasibility, and procedural aepects of tha proposed amendments ware waived. Review of these comments indicated that additional technical data and coat information were required befbrs tha proposed amendments, or revisions of the proposed amendments, could be promulgated Meanwhile, the EDF filed petition- with the EPA requesting the establishment of a comprehensive program for regulating airborne carcinogens undar Section 112of tha Clean Air Act Tha aspects of tha BDF* petition concerning the devriapw--t of standards under Section 112 Ms.......... similar to thoee proposed to thefane 1. 1977, amantenants ta the VCi Based on the i amendmentumd die 1 that it i propnnsd VC amendments antH after it had acted on tbs EDFs petition.. On October IQ, 1979 (44 FR 89842). tha. EPA propoead T for Identifying t Regulating Airborne Subetaneee Boeing a Riek of Canoar." This proooael addressed several issues which wen central to the proposed VC .............. amendments. It also articulated the EPA's conclusion that Section 112 does not express an intent to eliminate totally all risks from emissions of ehbonie carcinogens. The EPA's selection of the level of oontrol far a hazardous air pollutant amission standard would not be based on a policy that raqtares zero . missions of carcinogens. This policy is consistent with the basis far other recent actions under Section 112. For example, standards for benzene from coke ovens and leeks horn equipment components In benzene service era not baaed on a zero emissions policy but rather on a reasonable level of control which considers emissions and health risks. Tha EPA baUevaa it is not appropriate to leave tha proposed amendments to the VC standard in effect or to promulgate amendments bated on the proposed amendments. Therefore, the June 2.1977, proposal is withdrawn. As described in the following section of thia notice, the EPA began a review study to obtain additional technical data and coat information and to datannie whether other amendments to the standard are nssded New amendments developed aa a insult of the teview _ study are proposed in this notice. Review of VC Standard ' Early in 1989 the EPA began a review of the VC standard. The primary purpose of the review waste investigate the adequacy and appropriateness of thh standard in tight of policy decisions, health studies, control technology developments, and enforcement and compliance expmleiice which have occurred since the standard waa first promulgated. The review consisted of a screening study of. (1> Existingand new control technologies. (2) sources not remitated by tha standard, and (3) enforcement and compliance experience since proonlgatian of the standard Information anddata evaluated during this study were obtained through literature seaichas. plant visits, and' intorvtewa with tedaatital japsamntedsaa andEFA fegloaal ' personal involved in atehwiamwit end industries. The tefiwmstten end date are I in a document thatmay be section of tide preamble. Dadaione based on this review ana swmarixed in the next two sections of this preamble. As another separt of the review of the VC standard, the EPA'sCercinogen Assessment Group reviewed new health studies titaffteve become available sine# the standard was promulgated. Thie review included a study of the estimated carcinogenic strength of VC (the VC unit risk number) and focused on whether thia number should be changed to redact new tarformaton. Since the current standard waa promulgated, new occupational studies have confirmed qualitatively that liver and brain cancer incidence an asodatad with population exposure to atmospheric VC. However, none of these now studies have luffldent exposure information to warrant a refinement of the quantitative cancer risk estimate. Findings sad Cenduafaue of the Review Study The findings and conclusions of the VC review study on presented in the following subsections. The first subsection discusses the need and basis for tha currant standard. The second subsection addresses the level of control required by tha current standard. The third subsection identifies source categories not covered by the current standard and evaluates the appropriateness of regulating these sources. ft) Need and Baeie for Current Standard The current VC standard waa established based on judgments concerning the costs and benefits of the standard to society. The standard is not designed to eliminate VC exposure risk entirely. Rather, it strike* a balance between public health protection and the coat of that protection. Data (evaluated before the current standard was established) strongly indicate that VC causes or contributes to tha development of angiosarcoma, oth$y cancan, and various noncarcinogenic disorder* in people with occupational expoeuro and in animal* with experimental exposure to VC. Although no doaa-raapoMn data are available at tha concentrations of VC found in the ambient air, the ERA concluded when the standard was sstahliahsd that any atmospheric ooooentration of VC poee* some public heath risk. To eliminate the risk of VC exposure entirely, a complete prohibition of ell VC emissionswould be necessary. Tttis wouldesqttira tha closure of the entire industry and result in serious, advene economic Impacts. Furthermore, the EPA concluded at the time the current standard was established that a complete prohibition of all VC emissions would not be desirable or neoMsary. The EPA CMA 007806 tMrfwM tUa to stownftU the imnnfirlal i-- af Vf piaihrn far width desirable aUEtoai ant readily available; (l) the pntonOal adrarse health end mrintonaaaiai tafaria associated rrith^C eabrtttatei that have Ml bam toren^T Madbd (S) (be number of euiplujaiea. particularly tofabricatiai industries. who would become at least temporarily unemployed: md {4} the availability of control technology that Is capable of substantially reducing emissions oTVC into the atmosphere. Although all EDG VC and PVC plants have now incorporated VC omiaainn controls, the maintenance of a Federal standard for VC is still considered necessary, lhe VC standard omrietaa requirements for the proper operation and maintenance of control devices and the proper implementation of wort practices. These raqaitemmta nisei an to mlnimiaa health (Mu and the and community imparts which would result ham standards designed to reduce risks to sero. Relative to the Initial control coats, the additional cost of matatainfeg end implementing the Federal VC standard is small. Nevertheless, if the Fadaraf standard la discontinued, these mall coats may bo sufficient to provide the industry with ah economic tocentirt for discontinuing the use of proper control measures. Thus, the continued maintenance of Federal standards for the control of VC is necessary to snsate a continuation of the current lord rtfcontrol. Additionally, the standard is important for the control of VC amissions from plant* built in the hilara. The Federal standard would he to iartnaee the candnaganic risk to large anpaaato of th* population, (hr MFI whan the standard was utigtoalij proponed, approximately 4J edition paopieRvud within *SmM* rate af0X1 VC md FVC plaatoj Ammdta^Mh* BPA tea purification ami VCi and purification equipment. monomer at PVC pleats, sad vents from fqgitivs 1* based primarily an fito oftntrolof Federal standard ler VC. or rmanaabla of (belt) on fbe.proposed dated that to order to m control devica at a fppmv to'ofldt ^munena^menRmim alun rintotitont a (harms frofi Htto ppmv worid merit to fittis reduction io mas* aniarinne rt VC Vtaaiy, commentars questionedthe rationale ortha'caro Because Ota proposed 5 ppmv mission tonfl was not based on data from a tiootrol technology dlffsnnt from that-aa*ly*od Tor the entrant standard the lowestfeed of pjsWiiJ which has been oonsUtatitiy achieved, da EPA withdraws fiwpupDaadSppmv Until aad affirms lbs ahiul 18 ppmv limit- If och a ladhnalogy bad been identified, it could harmboan the basis of a revised standard However, during the review study >o maneadvanced technology was IdentiBari, even though data an todnanjea. carbon adsorbers, and tdlvaot absorption control aystaras on existing plant* warn abtalaad. Although dose data Indirnta diet indnerattts are capable af aadudng amissions bdow W ppmv. lApptev rapraaanta the lowest lava! ofcontrol which has b*aa conailfdy achieved. Baaed on this information, the EPA has concluded that thorn is an towrmrori or tie* control technology that ha* bean demonstrated to signtfifindy and csnristawtly reduce a^mim to a level below that required .10 laplammd i Kecf Stanford--01 g/frg SBC. The atnmt oxpdtiortoatioa vent atondrad afdig af VC pm hg af BDC dees not tequila an addan control device. Instead, in# ten caa be achieved at mat pleats by won ulling let the modUfeatiene. At the tima th# origiiial standard was wriltaa. larinaratian of (2) ftovmmwfTidmvtngr A--rffovuf pfCanfiaf L;-.- -r .* This auhaacthm dascribs* the stent* of tbs technology-baaed toed afoantroi for sources oovwad by the iwmi standard. The peasant atotoa af current VC standard is praaaatod to Table 1. technology diffsrant bom that analyaad umilraml wi kirmt re of nasaype had system wtth an hutemnlarar aqnlpmont conhel device. Tbs m> of mgfpn feed to da MX oxyddorinaten process decrease# the CMA 007807 volama of hurt wbitun ta ft* im( stream and uiiniqaiiitty, the coat Kir supplemental Mai required for incineration. Comments received or tills proposed emend--tetfoamed primarily requirements a--Mtodwtth &***' production af i The review i technology for oxycktoriastion venta at EDC/VC planta that had Ml ban considered during the dowefopaamt ef the original standard Additionally. tha EPA reevaluated tha eaat of seta-- incinerator controls and reached the same conclusion drawn in the development af the original atandard. Aa before, the high coat aaeociatod with incinerating oxychlortaation vantn at existing EDC/VC plants makes tide level of control unreasonable. Thus, the aariant standard of hi g/kg EDC ia oonahiarad still to be the most raaaosabte level of contiol far aeiatiag oxychlorination vents. In addition, the review study concluded that aigniflrent now construction or modification of EDC/VC plants is not expected. At this time, only one new EDC/VC facility la reportedly planned (BF Goodrich has plana te construct an EDC/VC facility in Convent, Louiainne.) Oxydtlorination vanU at new EDC/VC plana will be regulated by the propoaad standards ef performance for air oxidation processes (40 CFR Pert 00 Subpart IQ) or by the' BACTy LAER tuquirumenta of new source review regulations applicable in specific locations to a level compilable to that achievable through the use of incineration. Because the technologically achievable level of control ia assured through the current requirements, the EPA concluded that investigation of additional control (i.e. incineration) was not required for oxychlorination vanta. Reactor Opening--0.0Sg/kg PVC Product The current VC standard restricts emissions during polymerization reactor openings. Tha standard was based on reactor purging and on a reduction in fhe'bequency of reactor openings. An increased level of.. control was not proposed in the 1977 amendments. (Tbs level of control provided by die currant standard. 002 g/kg of PVC product reduces VC missions to about1JB Ml par year fbr < a modelPVC plant.) During the review of the standard, no tad--rogy wee identified that would provide additional VC reductions bayuuu tb# level of the current standard. Amelina, the ERA te not investigating further the control of reactor openings. CombinedSources AfterRetfn Stripping. The soirees ofVC emissions covered ander the current atandard '`^'tiWUtihOWautgrt***^^' -,cwrtfsb- include Mend Writs. Ayers, ceutilfi^a. storage rilea. h^glng ijuwUum. and any aoeroaa foBowtag the stifoper. Control offo-- atateUhmi te binodtar either stripping the PVC resin to pacified (baaed eoreota type) residual VC teaof (U. --p--for --peiuluu. bulk, eehitiem; MolrtM leefar end i fordtaperstao raataa) or fsrisoo hem all t tha slripperwith a raataa" to he sttppod to lower levels (Lm. lOPpyta Her--pension, balk, notation. md tatax reataa; and MO ppm for dtapanien raataa). Wtes the imanrtmintt wen proposed the IPA believed tael < proposed limita; t Additionally. tot inherent diffiraitiaa ta resin." taformetioo djustmects to resin cayesUtane are made ronttaely, min are rarely, U result of th--comment*, the BP/ oonduded that It te hyeibla ta cases to dtettagtaeh briweoo new existing rataoe --1 still have toy covered by the yeopoeed Further, thoprogoaed amatnfmaots did not addraaa what tevale ef technology. Far th-- reasons, theEPA chose ta evaluate whether Ugher towels of central are mhfrvahtofnr all rastaai orenlpCv--tataeclplotee--of retina. The review atadg found that reel* tripping technology has improved since the currant standard wee | and that an------eon lower resin residual VC L--------- those required in tha "<g/--1 atpadwd In certain cases, soma ruins can meet the more stringent levels igeriftad in the previously proposed aasaarfrienti,. However, otherpeooeaaon manufacturing resins of diffaring grades and characteristics can only marginsHy comply with the original standard Been-- efthe wfdb variation ta main grsdss end characteristics. It cannot be concluded that even though a particular resin made by one company can meet a particular level any otharrestn or similar resins produced by another company could also meet tael level Furthermore, in soma cases thaaa Kaesore nMtafo& the mdse atringent ta propoawrnrevtousiy are stripping Aeee twins to rate low tevel to offset i th-- resins which are i difficult to atrip. WTIhoul tide ability to average die Missions and reductions among raataa, th-- processor* might not achieve the current standard Exempting main gredee knownfo bs difficult ta strip to not fusible because th--reahtecanridf readily be daftand. Fw the tangoiag reasons. IhaEPA has concluded that th-- to an demanstihted level of control which could signifkeatly and consistently <*< VC levels ta raataa In levels below that required by the cumnt standard. Therefore, the EPA te not fniraarteating farther the control of the sources after tripping. Equipment Leak* Because littie wee known about lank detection and Umtataion programs for control of qaipmrat leeks bom components in VC s--ica. spadfte raqniramwtia for th-- programs asm not taclndsd ta the current standard taotaed each plant was required to taetitata sad impienmat a fasmalined total detection and eltatinetion proyam incorporating both a fixed-point monitor and a portable. subject to apgrovui by the AAtataabater. Canaaquantiy. die to site-specific dMhr-- among plants, as well aa isilatimis ta taak definitions end motatmtag practices, differenoas in control afaqaipsuaid leeks among tha plant*here rasultad Since the standard wm p--tagetad the SPA has obtained mata Mtaaethm pertetatag to tha control of equipment leaks bom components in VC service. With the information obtained form the development of other standards, an effective leak dstacUuu end repair program based on -- of a portable motator can now be specified for equipment covered by this program. The in the of tfcto Belief Yatvo Ditcharge Standard. Boor-- efVCamtariane are--d by thia Stamford todode diadems bom relief valves an pessuiw vessels, transfer tales, and other npilpuieut ta EDC/VC and PVC plants. The standard is based on emission control by a combination of equipment and process modifications, and operational procedures, found in plants during development of the standard An exact combination of modifications and operational procedures was not specified Instead a performance standard (I.S.. an emission CMA 007808 hjm_______ Federal JUgtofar / nl fiP. No. B / Wednroday, )enuroy fr, 1--5 ( ftypuaed Rules standard) w*i Sst*Wished because!! Jo source* covered by the VCgiandanC inaaeaesn and diet the current level wai believed that different the EPA conriadad thatnone afth* ef oentrol malting from the EPAs combination* could ba'equally effective . additional sources identified in the atandard and OSHA s standard is still In controlling relief valve discharge*. review study warrant a Federal raeseubto The current format of the atandard standard. inadyUk Off-^edficationreein* prohibit* all relief valve discharges except emergent# discharges. , Uisceilaiteous SauroeeefVC - aauMnfag VC has been token to Emissions. Miscellaneous source* are fandfiHa where the gaseous VC can be Emergency discharge* are described aa thoee whidt ooold not have been avoided by taking measure* to prevent the diacharge (Le,, thoae that are "nonpreventable"). Since the atandard wai promulgated all plants have experienced some release*. Many of these release* art considered preventable by the EPA. Based on visits to plants with good compliance histories, the EPA concluded that level of performance reflecting compliance with the current format of the standard through the combined effects of equipment, process modifications and operational procedure* remains reasonable, during the review, no technological level of control was found that would provide for e more stringent standard. Therefore, the etandard is still considered to reflect the appropriate level bt control for thaae sources. However, as discuased in the Administrative Revisions section of the preamble, the EPA if proposing to revise the standard by setting limits for relief valve discharges in a Afferent format Administrator* Aspect* of the Standard. Even though the EPA decided not to revise die level of control associated with the current VC atandard, the EPA identified revisions to several administrative aspects of the standard. These revisions as well as those identified above, are discussed in the Administrative Revision* section of the preamble. (3) Review ofSources Not Previously ' Covered plants other than PVC nuABDC/VC plants that ero VC an a raw metarial or produce VC as an intermediate or by- product The BPAha* identified four such plant*, two of thaae planta produce l,l,l-tr\chloro#han*, on* produces perchloroethyiene and artchloro*thylane and the fourth plant prodaea* pesticide*. (An additional 1,1,1-trirfotoreathana unit was constructed at a fourth location but haa reportedly never opartled. Thera are no plans to operate in tha torture.) Review of VCemisaico sources at tha identified planta showed them to be wall controlled. Emissions of VC front these plants are primarily from fugitive sources end rungs from las* than 1 Mg/ yr to 14 Mg/yr par plant to general, the VC NE8HAP requirements for process vents and equipment in VC service an being mat at the miscellaneous aouroes due to company policy consideration* and State and focal regulatory requirements. In addition, many af the equipment components in VC service would ba oovaritd by standard* of performance for new souroas and standard* for source* in nonattainmant areas. Baaad on the investigation of the** sources, the EPA concluded that they an already relatively wailcontrolled and do not contribute significantly to VC expoeun. Fm these reasons, additional requirements for mfooalianaous sources of VC an not befog propoead at this time. PVCFabrication Plants. Then ere about &00Q fabrication plants which taka the min produced byPVC plants released However, tha currant EPA etondaid tatand* that all mins, forfaiting off specification mins, be stripped to reduce the VC emissions from souroas downstream from tha tripper. In order to clarify that stripping rsquirmnents also apply to the offspecification ratio* before removal of landfills, thasa requirements are being restated to axplidty address offspedficatfoo resins. The EPA believes that tha fowl of control resulting from tha stripping requirement* is reasonable; thus. VC emission requirements for landfills are not bebfy proposed today. However, the EPA recognizes that VC may be emitted from hazardous waste landfills and is evaluating and may regulate under the Resource Conservation and Recovery Act (RCRA) voletils emissions (including VC) from landfills at hazardous waste disposal faculties. The EPA alto recognizes-that VC has been-detected in municipal landfills. Therefore, in addition to.' assessing VC emissions from hazardous waste disposal facilities, a (RCRA) Subtitle 0 TASK FORCE has been farmed which will assess all environmental release* including sir emissions from SubtiUs O facilities (a landfills). A* discussed In the Findings and Caadurians of the Review Study section of this preamble, the EPA identified several administrative revisions that are This subsection discusses the status of VC sources not covered by the current standard that were identified in the review study. For these sources, the EPA assessed whether a Federal standard was warrentad. The EPAs assessment of these sources was based and fashion it into intermediate or final products. Emissions from thqsp plants an aatnhated to be about 0.0038 Mg/yr par plant, ht comparison to VC production planta (which typtaefly emit about ti Mg/yr). PVC fabrication plants an small emitters ofVC ifstandards appropriate aa a result of the review study. The rational* for the proposed administrative revisions is presented in this section of the preamble. These revfotonb inehide: (1) Reformatting the mlaatoia limit for relief valve dfochaipse. (1) providing compliance primarily on a quantitative analysis of VC emissions from thaae sources combined with a qualitative analysis of risk* associated with exposure tit VC ' wan dovufopad far this categorythey would not mult fonduend emissions because the best control far those plants is to reduce the VC level* in the --ins .. tost procedure and a specific emission Unit foroperators who strip in the ieootore.13) specifying requirements for leak detection and repair program for from these sources. The EPA considers befog processed by tha fabricators. . equipment component* to VC service, these analyae* to be adequate in place Resin stripping beyond the fowl that end (4) mtooaUaneaus revisions. of a thorough quantitative risk process economics would dictate is assessment for purposes of determining already being done as a mult *f the Relief VaN* Discharges whether a Federal standard is EPA s current standard and OBHA'a VC Background. Tbs current format of the warranted for the** source*. Because standard, baaad on the BPA'a atandard for relief valve discharge* these source* are already relatively assessment of these souroas. th* EPA allow* only "emergency" discharges well-controlled and the quantity of VC concluded that they do not contribute (i-s., discharges that could not be emission, and consequently, the risks significantly to VC exposure. Therefore, avoided by taking preventive measures). associated wtth exposure to VC from tha EPA brnfovas that tha evaluation of The standard applies to all pressure these sources, an small in comparison controls for PVC fabrication plant* is relief devices on pressure vessels. CMA 007809 / sa, No. s / {Bwwy * _r 1SB7 trarotorHrow rod alter eqiifaweurtt EDC/VC and PVC plants- The cartel techniques rimsldarwi m Ite bow of the standard iuvelw a anrabinatian of equipment aeTdiftratiero, process modification*. andsproTOioroi procedures. Aa --A cnrafprottoi ofr modificatiaaa and flf--tinael procedures eras m*pacified ia the current standard: rather, a performance standard (1a, an aieteinn standard) . was established bacaaae different comhiofttiaii of thf nodificotiino ^ procedures wars axpactad to ba aqmlly effective in rantmfling relief valve discharges. Based an 6 years of enforcement and compliance experience, the EPA has concluded that the relief discharge standard has resulted, in: (i) Significant reductioas ia the beqaesny and quantity of VC discharges from relief valves. (2) significant nee of agency resources to evsluate individual discharges for preventability. and (3) uncertainty on the part of producers regarding whether they comply with the standard. Additionally, the EPA leaned soase of VC and PVC behave that this part ef the current standard applies only to discharges through safety relief valves and that discharges through other pressure relief device*, such as rupture disks or manual or automatic vent valves, are not covered. This interpretation it not compatible with the intent behind the current atendard- To provide more efficient enforcement by decreasing the burden of individual preventebuity assessments on the EPA. and to provide a better understanding to plant operators of the goal of the standard, this EPA is proposing to reformat the atendard for relief valve discharges and to define the emission points covered by this standard to include appropriately ell pressure relief device*. As discussed name completely in the following sections, the EPA ia proposing to changa the foramt oftbs numerical limits hi die standard to reflect the number of discharges that occur from thorn plants complyhie with the format of ths current standard. The EPA found in the review study that efforts by ell EDC/VC and PVC producer* to nemply with the standard srs reflected fat their ptefarwnnee fin terms of siza and frequency of discharges) sheer the ataadard went into effect In nenenL a reduction in the reported frequency and site of relief valve discharges by PVC prodncati has occurred since M79. A tether decrease in relief valve discharges by the PVC of decreeaedfasc e| ^ro llmlwl rafter the end quanfty ef reflef rots* tfieeharge* by MiC/VCpfon ham deosamd lightly *t reeeehnd relatively constant Outer udBaaioJorNmamriealLimit. In ealsrtu *> piaporod numerical limits. EPA first evefaafod te detail the recent performance flWl to 1903) offire PVC plants andmm EDC/VC fdsnt That* plante were etwaaa tend on discussions wttbBPA Haglrmaf Office personnel end foduatry and were intended to represent plants with good relief valve discharge records. In general, the WA's evaluation of these plants Indicates thefasefa has adopted the combination of equipment, operational procedutes and attitude toward prevention of relief discharges intended by the camnt standard, and that their resulting performance is consistent with ccmpfianos wfth (ha current standard. His EPA * evaluation found that s few discharges may continue to occur from soras plants that comply with the standard. This observation is consistent with the expectation held by the EPA when the standard was written. In order to revise the standard in tenna of numerical limits repnaandag compliance with the current format of the standard, this evaluation meatsted PVC and EDC/VC plants. For plants, relief valve discharge parfocmeaca data were further separated by source (reactor vs. nonteactor) and by rests type The EPA then reviewed me perfotwacs of M additional PVC pleats and 12 additional EDC/VC plants. The EPA reviewed this laigs sat af pisals to ensure that the level of performance demotetrsted by the evaluated pleat* could be achieved by all PVC aad EDC/ VC plants The numerical UmMs presented to the based an i aaeoctatedi provisions of foe mdatfng i evaluated hi detail. Aa axpactad, the EPA found iBaave in dm operational pracedacro associated whh control of rattsf valve d of the plants. I relattonabip w affKdvanass af apscMe hardware Mama 1901. Performance by the EDC/VC industry exhibited a Ians mmftad trend ludgmeet. the i hanjfware end opsiedonaf procedures hapiemantod by rod) of the plants along with the atglajev adopted toward prevendng refief valve dischargee (present the types of centrol measures that As sfowled intended. In particular, the EPA uodudad that (ha tow frequency efdtsehaigw by the visited plants wee buficettosoftfaefr degree of effort to prevent relief veto# discharges. Consistentwith tbs goal of this proposed revtrioo, this EPA decided that an altanmttro namarfeal limit baaed on performance resulting under (ha cunent standard could be revised ia a format that would ba easier to understand by enfarctmeat and industry peril uinat Tha EPA investigated two basic ways of expressing relief valve discharge performance for PVC plants. One format ia based on maaa emission*, for example, the pounds of VC discharged par ndUioa pounds of PVC produced (lb VC/MM Ih PVCV Baaed oo a review of methods uaadby industry to determine the amount of VC discharged from relief valves, the EPA was anatta to identify a sufficiently accueate method for measuring discharge (piantities from relief valve*. At present producers ere required only to astfaaete discharge ' ; quantities for reporting purpose*. ' Demonsttetioa af nompliaare with a lb VC/MM lb PVC Unit would require produema to measure the amoeat of VC discharged during an incident. Because a suitable measurement method was not identified, the EPA decided eat to redefine mfief valve discharge performance by PVC pleats in lb VC/ MMlb PVC format Arofaar format is broad ro the frequeroy ft*, awaber par writ time) of discharge from occurrences. No method for imirm ing lha ronunt of VC dischroged frna retef varies is needed bearow only the onmnaaro of a release is requhad far tfasfermat. Th*^ detumdned by aatettrtag procaes paramaSeraro well as inspecting relief valve performance reports. Thro, of the two beats ways of expressing relief valve pilferersroe that were considered foe EPA eelecled a format Based on this decision, tbs EPA then considered how foe foramt would be applied to PVC rod EDC/VC plants. At PVC plants, ths frequency of discharge* from polymerisation reactors and associated process equipment any be related to (he fact that a batch process ft used to produce meat typer of PVC. for beleh PVC prodaetton process**, the opportunity for discharges is related to the number of Item* * row CMA 007810 polymerization batch is initiated. Expressing relief valve Hilary, performance** these planto with a ditcharge-per-batch format account! for variationa among plants in the number of batches prodnped. The EPA selected 100 polymerizatfeo batches as a convenient basiaior expressing relief valve distbarge performance by PVC plants with batch production processes in a discharge frequency format. Farther, the EPA noted that the ability of batch PVC producers to limit the discharge frequency may be different for reactor and nonreactor diacharges and that reactor discharges may vary by resin type at any plant Consequently, relief valve discharges by individual PVC plant* (except for continuoua solution process plants) were classified according to typejjf discharge (Le reactor vs. nonreactor) and the reactor discharges were separated by resin type. Nonreactor discharge sources at PVC plant* include blowdown rente. transfer line*, and storage vassal*. Because usage of this equipment is also related to tom* extent to the frequency of batch polymerization operations, the relief valve discharge performance by nonreactor source* in PVC plants with batch production processes was also examined on the basis of number of dischargee/100 batches. Unlike the batch ptooess need to produce other PVC resin types, die solution PVC process is continuous. Thus relief valve discharge performance for the solution PVC process cannot be expressed on a frequency parbatch basis. Instead, thd relief valve discharge performance associated with the solution production process can only be expressed in terms of the total number of discharges (reactor and nonrsactor) per year. Similarly, the HDC/VC production process is not a batch process, but is continuous. Thus, relief valve discharge performance by EDC/VC plants also cannot be expressed on a frequency par batch basis. Moreover, the EPA was unable to detect a direct relationship between discharge frequency and VC production at EDC/VC plants. Thu*. tbs EPA daddad to define teWf valve discharge parbananoate EDC/VC plants on me besia of a total number of *"""> fit ipll Tgj f Findings. PVC Reactor Discharges. Suspension resins account for the highest percentage of total PVC production. The remaining PVC production is in the form of bulk, dispersion and solution resins. (A small amount of latex resin is produced by a process closely related to the dispersion process.) Examination of relief valve discharge performance associated with production of eaapaiminn mrt hulk -. resins tndioaias Oat nangm dimhai, frequency generally is ailhsr leas then 0095 diacbargaa/UO batahaaarJa weetar. (Recent i i ngget i discharges have been i the nequendaa'f at this plant an net atidpetad. between SOB and OlOl IharhaiaeaJlUT hitchflii) Fqjthv wUMttbift irf FFlft* L EDC/VC Dtacharges. During the revieulstady, Em EPA evaluated parfafmaaoa by one EDC/VC plant in than* discharges par year during the period from 1M to isRL Amformance fcytxt. piit ahir monUil p (gn dischargee/lOO batches. . Hw rmmntnr rHmnhmrfm fceipLnry associated with Aspersion and wax production l* typically saro.However, for a typical dispersion or latex resin , process with* low production rate (U. number of polymerization batches per year), a tingle emergency reactor discharge in a given year would be equivalent to a discharge frequency of bout 0039 discharget/100 batches. Nonreactor Discharges. Nonrsactor discharge frequencies By PVC plants typically were cither less than 0025 discharges/100 hatchet orWere much meater. (Recent nonreactordlscharge frequendetreflecting poorer performance than tbs 0023 levhl Tanged between OOM aodlUZS discharges/too batches.) Furthermore. with the exception of two producers, no more * than three discharges per year were reported from nonreector aontcas in PVC piants during the period from lfltn tolMS. ' Each of the five PVC piants that the EPA evaluated in detailwas among those achieving OjB diachaigssAMO batches or ices in sech of the reactor detalL TUsglmit experienced about four I WjA--* CaMBHPi|MJ ^OVwHW* K- Qi . Recent fiflgi to lflOS) relief valve discharge performance data for tiarEDC/VC producers indicates sn tadustry range of 0 to 7 discharges/yr. tnformatian obtained from plants during the review indicated that where applicable, similar type* of equipment process modifications and operational procadnraa aaed tooontrol relief valve mschargee from PVC plants also are aaed at H9C/VC pants. The EPA examined discharges by the EDC/VC producers who exceeded four itlsrhergee isone or more years since 1001 and found that one or m re of the dfechiigm at each plant were proventaMe.Elimination of the preventaMe diachaig** would allow each of thee* plant* to reduce' their *--*--1 discharge frequency to four or Smnwiaiy ofNumerical Limits. Based on the study of current relief valve discharge performance by PVC and EDC/VC plants, the EPA is proposing that the following numerical limits for relief vale* discharges be added to the atandardrEach discharge causing an exceedance of any numerical limit presented below would be considered a violation arithout regard to whether any individual discharge eras preventable. discharge categories nd 0028 diecharges/lOO batches or iaaa in the nrmfairtm llai hmfm nmlaoiafc Vkn Ri _2S2L examined Individual discharge tnddenta forth* PVC producers wfadea recent performance baa exceeded 00*5 dischargea/lOO batches in erne or mete of the reactor diecharge oaiageeiae or wfoo vxnidid.0421 batcfaaa and SdietAaigee pm year from nonrsactor sources, far evwyoma,A* EPA identified anaor most disrhargm that wen pnventabta.Biminaliimaf . thaee preventable dlediaigrafridfof that theee producers should have achieved diecharge ftsqusuries , comparable to (he five WCpimBMhat the EPA evaluated in detail. Solution PVC Process. Discharge frequency from both reactor and nonreactor aouroeeby th* singlajilaat producing PVC by the aobitkm prooaaa was ssro during tbs period UB to IMS. Previously, this plant axparianoHi aa Compliant* Provisions. The EPA tvcogtftta tint all plants may experience un unavoidable relief valve i--at aome time. Examination ofrelief valve discharge many aa two discharges tea M month * performance by PVC plants with low CMA 007811 / Vol. 80. No. a / ^s discharge frequandaa indicated that plant! with the lowest polymerisation batch frequencies typically experience about one discharetto a 12month period. Tbs EPA rnorfuded that for most plants a 12-month reamrtingperiod (rolling every 5-mostos) area both `I*..L ^ "polymerization batch" eonsists of each sequence of rheiglng VC and other materials to tha reactor, hasting reactor, contents, polymerization of reactor contents, and removal (l.*., blowdown) of reactor contents. Any batoh that is aborted following charging of VC to the operatinghfateey. rvtief valve discharge performance by certain plants is ejected to be mudi better than the :*f respective Hmits. For example, tome new suepenakm mm PVC plants produce about 5,000 batches during a 12-month r*~n period. One and suitable and appropriate for determining compliance with the proposed numerical limits- For plants producing only a small amount of a particular rosin (Le. low reactorIs nonetheless counted ss a polymerization batch in assessing compliance- For PVC plants producing bulk resin, a stogie "polymerisation two dtedupgw at one of these plants daring a dunpHaitce parted would result le-a dischaige performance of 002 and 008 discharges par 100 batches, number of polymerisation batches), an apparent violation of the standard may result from a singls discharge occurrence during a 12-month compliance period at described below. butch" indudesboth piupufymaHgtion and postpotymerization reactor operations. Discharge frequency can be recorded In two weys. Discharge frequency can respectively- The seoond dischaige in* drotef the compliance period would be a violation of tha proposed 0035 discharges per 100 batches limit despite the fact that the first dischaige would For PVC plant producing a tingle be recorded on the baala of discharge result in performance well below the resin type to meet the numerical limit for events (involving discharges from one or limit These types of plants were reactor discharges (i.a.. 0.035 mom relief valves) or on individual amelderod in selecting the proposed diachargea/100 batches), it must relief valve discharges, la most cases, Hmits and reporting procedures for relief experience and average of no more than plants currently report discharges valve dischargee. The result that plants one discharge par 2456 polymerization individually when they occur from relief of this type must perform well below e batches over the preceding 12-month valve# on separate equipment However, Hmits in the standard in order to be ir. period. An average reactor discharge certain equipment such as . compliance is consistent with the frequency exceeding one discharge per polymerization roacton that are proposed limits, which were selected a 2.858 batches would be a violation of the equipped with multiple relief valvee may represent an upper boundary on the standard. However, if the plant made xpoienoa discharges simultaneously number of allowable dischargee lata ban 1.858 polymerization batches from more than one relief valva. Moat intended by the standard. The EPA over the 12-month compliance period, a plant* cunently report such multiple expects that plants using the best single discharge occurrence would bo an discharge* boa single plena of technology and procedures should be apparent violation of the standard (i.e,, equipment aa a single discharge. Thus, able to perform better than the proposed the discharge frequency per 100 hatchet the performance levels serving as tha limits. would exceed 0-035). Because basis for tha numerical limits represent Reporting Requirements. Tha current insufficient batches were made, the individual discharges and net multiple standard lot relief valve discharges reported discharge frequency per 100 discharge events except when they requires producers to report discharges batches would not correctly reflect the occur from a single placeof equipment within 10 days of tile incident The EPA performance by that plant in comparison For determining compliance with the is proposing to eliminate the 10 day to other plants complying with the numerical limits, dischaige frequency is reporting requirements and to require standard. In rectifying the undue to be recorded on the basis of individual . reporting of all discharges on a quarterly compliance burden posed on plants with discharges except whan eimultanaous basis. Although compliance is to be small numbers of batches by the discharges occur from relief valves on determined on a semiannual basis, discharae/lOO batch format and the the same piece of equipment quarterly reporting of discharges is selected 12-month compliance period, A relief vehro discharge to considered appropriate because violations of the the EPA it proposing to add additional to bo any venting through pressure standard may occur wellbefore the end provisions affecting the number of relief device to prevent or relieve an of the 8-month period. Quarterly batches used to calculate the discharge overpressure ntmdltiwt from equipment reporting notifies enforcement personnel frequency. For PVC plants producing in VC eervioe that results to emiaaiona of potential violations and violations less than 2,858 batches of a particular of VC directly or indfrectfy to the .i that have already occurred prior to the resin, the minimum number Of 2458 atmoephere. In determining whether or end of the compliance period so that batches will be used when determining not a relief veiva discharge results in ewiauive actions can taka place sooner compliance with the numerical limits. emteetona to dm atmosphere, the following the end of the compliance PVC plants producing more than one controlling factor ia the ultimate period. Information to bo tnchidad in the resin type must demonstrate compliance disposition of the gases. Venting to a report for individual relief separately for reactor discharges manifold or header system that valve dischargee is to be reduced to occurring from different natal production ultimately discharges to the atomsphere include only toe data, time, source, processes. Only the rotief valve constitutes a relief valve discharge. If cause and estimated amount of each discharge* and polymerization batches . tha manifold or hsedsr discharges gssas discharge occurrence. The semiannual pacific to each natal type ere through a control device meeting the 10 report wfll also intends information on considered for determining compliance. ppmv VC emission limit the venting complianca statu*. However, far determining compilenee done not constitate e relief veto* In addition, plants will now be with the standard for nonrsactor discharge. required to maintain relief valva discharges, the total number of For perpeeee of reporting compliance discharge records for 5 years, because of polymerization batches (regardless of status with the limits, plants will be tha potentially significant increase in the resin type) are counted. required to calculate their discharge per time period between a discharge To determine the number of ** polymerization batches produced far batch frequencies with eufllcient precision to domonatrate that occurrence end reporting of the dischaige. purposes of assessing compliance, the performance ia either equal to. below of Effective Dab ofRantion. The following guidelines apply. A in excess of tha hmits. Based on current standard as written will remain CMA 007812 41*0 /frtel. JO, Wo.fi/ in effect for relief valva dischsqyee toe proposed revisions ote.pntoulftoad Thu fnrrnwil silnsisiliaTliw nrrlilrn do not change fleitpdMd'iii^Ml Intent and ant Inteijjl imte lo snlliniiti to facilitate coopliMpoe enforcement efforts.Hum. toe currant standard will oonfinne to be oaEomed until the revisiona am pramnlgated. ^Yirr'ijJ f'n ftfnrtrr nmu~ftirii Test Procadum Hie test method formeasuringreactm opening losses was developed for main stripping operations that taka plane in vessels separate from As reactor. Same PVC plants, including all bidk resin manufacturers, however, do not aae separate strippers to remove aealrhial VO from the resin produced. Instead, these plants strip VC from die product resin In the resctnr (postpoljrmsricatiea reactor in the case of bulk resin producers). For plants with reactor saain stripping operations, the csnoentntiaa of VC in the reactor vaporapaca.es measure in accordance with the current standard, exceeds the MRg/kg of PVC requirement. The high concentrations result Zone VC ueiniueei diffusing from the resin into the vapor space during the period following completion of the strippingoperation (normally occurring under a vacuum diet must be broken before the reactor can be emptied) and before the reactor is completely emptied of FVC resin. According to the Federal Register nodes of promulgation of the current VC standard (40 FR 40SS3. October . U7B). any VC escaping from the resin after it has been str^ipsd to acceptable levels is not intended to be noimtad as pari of the reactor opening loss. However; the current standard did not indude iu the measurement method an acceptable method for determining what pari of the VC in the vapor space has escaped from the resin after stripping Is TMpia*ad. era added kmriher to riven hotel . allowable VC content from (haae bne sources. The measured nainnaiduel VC and Ihe cdfiadoted reactor opening loss would then beadded JogeOeE. and avenged oarer aVtfrour period accorihig to rerin type.Vfhe Mwur average meets the combined rtandariL the plant would be considered tobe In compliance earth both the stripping end Leak Datactiom madA requires tmplamsrtntiqn of a ZbtmaMxed program ftrdPtctlQe tfhikifrsn equipment to VC service and oUmhretianriftoera Teaks.Tfr> . formalhred prop sm hniudss a mtotipoitohC detector end poridWe volatile etgmriccompoundfVOC) onolyeer.The RmjJ puim mmillorlng eyrtras oontiauousiy monitors VC conceuti'utioim In the wort. urearemind quipOMOt te VC eereioe mi sounds an psureribed into. The porttoie member is med (ndepaadeMly to some tadMduto equiptoeut corepewetris for toaka Retiier than apectfyiagriM emberof ptotoa to be monitored, toe eoMltivMraof toe meltipouK detoolur. the VC conaenlraiiimthetlndkmtM aleak, and the actions to be token to repair leeks. Ths current standard allows hulk resin producers to cekidate nectar * opening loss emissions from the postpolymeriietion motor based an the number of reactor evecuatkma. the vacuum invlovad and the unban ofgee in ths reactors. Forauobulkraton producers with nrsrtnr rsein stripping rf riartrv opening loss emissionsis more complicated due to ths presence of water vapor in the mactor vapor apace. Currently, waivan of testing for producers with mate stripping operations in the motor have been granted on a case-by-caae basis by too EPA Regions, typically with the provision that residual VC samples an anlayzed n each batch. Anxiety of appunmL flout owaan arboretaare required to nhmM torie ne beoktonnri concentretkm of VC totofiemt arena of tlm pient to mm to totem*** toe C concentration that abredd be fetopmtod as todicetiag a teak. flans. thartom. were tailored bynach pinto mto reviewed by the the 8PA legtomd TheVA faad ietoejtoifewriM^ elimination programs exist amnag PVC and EDC/VC production plan'smd miscellsnewis sources set) thtototo leak deftaittoesaad nmnitaitog ; practices. The toUtioB end monitoririg practices, eleu with repair^etotoe^ ere primary tnfluare--anriwcoearito - igieuii mid isfloto I Stondirdsres >VAhas obtained fWinn jjvi iiiiinQ to mo ueAito tifalUuluu fiuui equipment lotos. Bused on this tofuruntion and the review of the Into detection and elimination ]ftn being implemented to central emissions of VC, (he SPA decided fr sptdfy leak detection end certain equipment components in VC service. Although frdbnnition obtained from development of other standards indicates fhat a routine leak detection and rqpairjeupam with s portable monitor can be an effective mmifijunq reduction technique without the requirement of a fixed point monitoring system. the SPA concluded-that fixed- point monitoring systems already in placehqve uses that justify their, retention hi the current standard.Jh. particulsr. fixed-point monitors allow for quick detection of huge VC leaks that Blight otherwise go . undetected until the next routine portable monitor screening. The EPA recognizes that existing fixed-point monitoring plans will need to bo reviewed in fight of the leak detection and repair fMiiimMBU hmimg f-ifia<t at this time-The complexity of existing fixed-poiat monilorim plans, in tanas of nuitour and disirihoHoa of monitoring points, aeries greatly among plants. Consequently, some pint owners or oprenlars may wont to altar tbs number of points that sm montimed end the distribution ofmomtaring locations to bettoroomplasMBt the specified pnrtshle mntotoriqg requirements, torch monitoring plans will he allowed providing they do not aker tha plant s ability to dated largs VC looks The proposed raillaini are primarily Intended to rtanderdira cmtoolnf VC iiaiMiaoa tore ogalpmonl lasts to doing this. Iha EPA is ooncomed tom storting stitoto films not bo revisions toctodo pretosiena diet totow plants withatoeting effective plans to effectiveness of thrtr plans wifimto additions] requirements. ftrniSTUngijr specific offadts nf aystofyieg task CMA 007813 ysLM **tL&^UgS3gE&**&"t P wWB^*iflgt an detection end repair requirement* on effective existing plans. Leak Detection and Repair Requirements. The-DA aetablished leak detection and repair requirements (40 . CFR Part 61 Subpart V) tor certain equipment in volatile hazardous air pollutant (VHAP) service on |une 0. 1984. These requirements were established in conjunction with the final standard for benzene equipment leaks. The requirements of Subpart V generally apply to pumps, compressors, pressure relief devices, sampling connection systems, open-ended valves or lines, valves, flanges and other connectors, and product accumulator vessels. These requirements reflect the level of control that the GPA considers reasonable for equipment covered by developing standards for VHAP. The 6PA is thereford proposing to add VC to the list of substances covered by Subpart V. Subpart V would substantively affect only valves and flanges In VC service within this industry. All other equipment in VC service are already required by the VC standard to comply with equipment and work practice standards consistent with those in Subpart V. For example, pumps and compressors meeting the dual mechanical seal requirements of the current VC standard will be in compliance with the Subpart V requirements. In addition, the sampling connection systems requirements of Subpart V are essentially the same as the current standard. The use of rupture discs for controlling teaks from pressure relief devices, as required by the VC standard, is consistent with the "no detectable emissions" requirement included in Subpart V. Requirements for controlling leaks from pressure relief devices are described in more detail later in this section. Thus. Subpart V will affect primarily valves and flanges in VC service by requiring a specific monitoring schedule, leak definition and repair provisions. Compliance with the provisions of Subpart V will be used to determine compliance with tin portable monitor leak detection and elimination requirements In the currant VC standard (40 CFR n.Q8(bM8KiI)). and therefore, the current standard b being revised to reflect this change. However, process units within VC and WC plants in which the percentage sf leaking valves is equal to or less than 24 percent are considered by the EPA to be effectively controlling VC emissions from leaking valves. For these process units, the existing leak detection and elimination program will continue to be allowed while the percentage of leaking valves is ZjO percent or less. Any process unit in that aeUeves that standard may be which the percentage of leaking valves applied. Section 112(e)(2) defines the is found to exceed 0 percent will be following conditions under which it is required to comply with the provisions of Subpart V. not feedible to prescribe or enforce an emission standard: (1) If the pollutants The Subpart V requirements for cannot be emitted through a conveyance valves are basedtin a leak detection designed and constructed to emit or and repair program that requires (1) capture thf pollutant; or (2) if the monthly monitoring for valves in gas/ applicatkm ofmeasurement vapor and light liquid service. (2) an .methodology Is not practicable due to initial attempt at repairing these valves technological or acooomic limitations. within 8 days after detection ofe leak. Section 112(e)(1) allows that ifan (9) repair of leaking valves within 15 amission standard is not feasible to days after detection of the leak unless prescribe or endorce, then the EPA may repair would require a process unit istead promulgate a design, equipment shutdown, and (4) repair of valves work practice, or operational standard, during dm next process unit shutdown or combination thereof. after repair is delayed until a process The EPA has reviewed the design, unit shutdown. Valves found not to leak equipment work practice and far 2 successive months con be operational requirements contained in monitored quarterly until leaks are , the currant VC standard. The only detected- Monitoring of equipment to sources covered by the currant standard detect leaks is conducted in accordance with ana of the requirements for which a with Method 21 and a leak is defined as performance standard [La,, an emission a measured organic concentration equal standard) is foasible are pressure relief to or greater than KUDO parts per devices. As discussed below, the EPA is million by volume (ppvm). For a setting a "no detectable amissions" limit complete description of the leak for these sources. For the other sources, detection and repair requirements, see the EPA is minstating those Subpart V (49 FR 23498, )une 8.1984). requirements as set forth in the currant In addition. Subpart V contains standard. standards for other types of equipment The EPA selected the use of rupture (e.g* flanges, and open ended valves or disks as the basis for the currant thus). Standards for flanges include standard for pressure relief devices. monitoring with a portable instrument Whan the integrity of raptures disks is under prescribed procedures within 5 maintained, equipment leeks through the days of observing evidence of a relief device an eliminated. Rupture potential leak by visual, audible or other disks normally maintain their integrity means.-Open ended valves ra Moss are unless an overpressure occurs. After the required to be capped, blinded or fitted occurrence of an overpressure, with a second valve. These previsions replacement of the rapture disk once are not expacted to significantly affect gain equipment leaks of VC producers with these types of equipment through tbs pcassure relief device. in VC service. The equipment and For emission control techniques that procedures employed as normal practioe . eliminate equipment leaks, such as the by these producers or ea a result of the use of rapture disks, a "no detectable current VC standard are expected emission*" limit is feasible. An generally to ensure compHanoa with instrument reading of less than 500 parts Subpart V. per million by volume (ppmv) above a Pressure ReliefDevice*. The EPA background concentration based on proposed end promulgated the work Reference Method 21 can be used to practices, equipment, design and indicate whether equipment leaks have operational standards in tbs currant standard before explicit legal authority been eliminated: that la. that the equipment baa "no detectable existed in Section 112. These requirements an found in 161.88(b). In The "no detectable emission" limit August of 1977, Congress amended - esdd not apply to discharges through Section 112 to allow the use of these the pressure relief device during requirements. Section 112 of the dean overpressure relief. (These releases are Air Act requires that an emission covered under || 81.64(a) and 81.85(a).) standard (Le,, a performance standard) The standard would specify, however, be established for control of a that the relief device be returned to a hazardous air pollutant unless, in the state of "no detectable amissions" judgment of the EPA, it is not foasible to within 5 days after such a discharge. prescribe or enforce such a standard. An The standard would further require an emission standard allows for some flexibility in complying with the standard, since any control technique - annual last to verify the "no detectable emissions" status or the pressure relief devices ends teat after etch over CM* 00781 ) ths4 standard rtyiiwlief iJbelPA regional pawannal togarqg flair experience mwMSsiariag lha cmneat VCitiaduiL hWAkfiiyMii^ several addifkiaal adnunisnative revisions ftat would tacflitale compliance and enforcement efforts associated with the cuneal Itase revisions represent innr rtmr^y> to the standard. A briefdescription ef these administrative revisions and the basis for making them follows. Definition ufLeak, Exhaust Das aad Relief Voire Dbthvtge. Tnnctioni) definitions of"leak".'Exhaust gss" and "reliefeatve discharge are being added to lhe standard to dartfylhe mppIficAffity rifdie standard to each of them types of VC amUsiuus.Puifiig their review ofenforcement and aeaqdiauue experience since the 1 Stamiafl to promulgated. the BtA cheoneered sgsersil eases id confusion over the intended laeaning ef ^eaV, "exhsest gas* and >etief vslve discharge." These three distinct categories fVC emiseinns arc Wing defined ta tire revised Standard to provide ecmtpMaiice end ladsea> did part of the standairi applies to any ghmn discharge af tC the DefmlUmefsrnc and VC Purificatit have purification and VC _ processes with Iha resell that aHarnieeaammns cowssadhftha been coni pmificatian being msisaritedarify that all purifkstiaa end WCfanwehen warn repiletien andar iha 10ppmwJHandmd. Ihmalarifpdy revisions regulations to improve undentaadhmnf the awtUcahiUly of this pari aftW standard. Hut. aithnqritAe mat a for dittnaiiiiii ttith 4h# 10 gpmv standardjpwflas thatUrn aaatnga saarrltsantodtanel-haur tempting num ha used, OtisJ4onr averagiag periodla Hi npeaiWd la lha 10 ppnv requirements, ^pecafyiag that emissions may net svnaad lOppaiveanr a 1 hma sirsrsgiqg parind rlaiifiss Ihsi lna.nli.wii nwylUw WS Am 10 ppmv standard is ani aa inmadad requirement Moreover tpsriflisiina 11T applies Is1 gaoa requirements, inchtding i devicedfpesK for byps^nl smisiisaiisrg indications af amtoomptianne Ifdsy howli4y Alt the 101 itieatWtlhelrimn requircmsmlsapply iseach axa stream Wm She laftMu requirement. 3Wai intended4eprohibit the * practice afar rivkiultAililBIBlkif headarleadhm So a canted riatica. According to me retfaad 10 ppae wM|nifiidaf^ |M stream rtaXainir\g mote than 10 ppmv VC edfliaaofhar exhaastjasritnMm coata'tn'n\g lass ftan IDppmy VC3 allowedonly rdmntha cambifamdstream is ducted is the coated device. revised stsidasd Isdaf^ that the alae^phedtoagpi vents that a process equipment from unsafe overpM Kmdlh of reaaf is not intended toi contaol MdvassMdtoaattsdlbvlsan However, the cementrelief vahia diadhaqgs standasddid covwanussfona from pressure control vtivaa Mionflt Included In the daBrtlflf nfrelief valve are ptaaeitmannlnfl systems-u3>as polymerization readtaa AoriStqp systems or i - - sAfldh act toi other than venting. Baaotor Qmsasqg i for MultPVCEmia PVCi productiaa'ofothertypes efWCa in ihttt of {he squiramtuit at lha revised standard as thqy imply to balk PVC ' totinpaadnoacstalighlnfactual industrypraotins No todnrtion is VC emlssloiKcantzolaljiagancy still setall from the change in regtiramaots for prepotymerisstina msrires. Inpn forGee atanriwdUheVC i thanSgpmaKpasinBofther to thaatoMSphase. da lha oaee af the VC < enoaedJO tandadawai Out rnmpIlMns noth tWahnoapimric ismat pesntinshls 1m this particular inproceta ws apply ta Im |uhd4ifiiiL CMA 007815 / Vol M. too. * V OtAer. Inaddition to the crviaia deerrihod ibcncn review dto km perfamud loldynttfr-uayetoi recordkeeping awlraportiiv burden no plants and to ideally any additional Ths EFA tdentfflatiHro anas where At reporting burden on plants coidd ba reduced. Ha nsrait reporting requirements for reetdnal VQ monomer pacification* and roactor epeniitg manurewants require that remits of all nomptiance teats pa reported to samianiRial moda.Ita WA to prapoaingto ahiwplmts tempo* nly test results that stone exceedances of exceedence* occur, plant* etal be required to indicstetoet tod to toe eegiiannil report This type at exception reporting is onrwntij eilawed far demonstration of compliance with the 10 ppmv standard lor pracnss easts. The second area is the requirement to report relief valve discharges within 10 days of tfanir occurrence, the EPA is proposing to allow plants to report relief valve discharge eccnmncee on a quarterly basis rathar faen edthin 10 days of their occurrence. Furthermore, the reporting requirements for nltaf valve discharges have bean staeamltaert by dropping tha need to saport actions taken and imrlnmantari preventive Informatiao on tha data, time, source, cease end eeHweiad amount of Initirirtuel relief irelire dierhaige wil he included with the semiannual reports along with information on compliance statue. Additional semiannual Mpaittag requirements being added far FVC producers are toe an each main type. Ibis leqebement anil provide general infatuation to facilitate review a lndusti paperwork burden ef dndllfnenjraaie. It ahorid ba ntoad that all Act ftZKXA) Setaion unflfl tmsmdoas snbstenoes each as vinyl chloride are subject to reporting requirements under Section 101(a) of in charge of ilaOiUD^ffll^mM/ MtoribWAnnlVMQMHHaIl of tfaa NRC is H)HK and to Washington, D.C. metropolitan ares it Is Vtoyi tindmtiectkm MBfU) rnpileflrm 1 30Kl)awd4*ft23BU)i teCEBLAmMticntto liebiMtiee. Ifcwmver. section will BMhaenffaepnUfa may file e written statement before, during, or within 30 Written to the ef this preamble. A verbatimtranscript of die bearing end wrltieu ^elements wtH be available farpubHcbwpection mid copying daring wottiud working boars at the ffA'i Caibnl Dodrat Section la Washington, HjC. (see MMMnms section of this The docket i* an organized and complete file of aB the fafbraurtiqn _ submitted to or otherwise considered by the BPA to tha development of this. _1 purpose! of the docket arm (If To allow interested parties to identify end locate documents so that they can affectively participate in tha rulemaking process, and (2) teasers ae the mooed in case of| judicial review (except for iatoregincy review materials (I 2d7fd)(7(A)]). In ai nartlsnre with section 117 of the Act publication of (his proposal was preceded bp nonaultation with mmpdate adeiaory nommittass. independent experts, and Federal equipment leeks and Included to the are the repair statue of detection and repair j these requirements may i roqniramenta to thie proposed rale have bean submitted far approval to the VC rtaan. - by tide definition, fifocei mgelatary flexibility amiyeia to required. Bvea tfaa i (QMB) under the Paperwork Seduction ActofmataUAGWOle/eaq. Oemmanta on these mmtoementsdwuld ba aufamittad to the Office Of Affidredf "Attention: Desk Officer wit ae to tbe SPA docket 0>ed above. The Baal rule will to any OMB or public an toe tafamatton rwllartton CMA 007816 t 1194 Federal Register / Vol. 90. No. 4 / Wednesday, Janniry 9. I486 / Proposad Bales Under Executive Order 1226L the EPA mutt jud|i wtafawntidlttlM it "major" and therefore-eobject to the requirement of a Rsgfaafary Impact - Analytia. Thit rwgalsgfan it not major because: (1) The nattahal annualised compliance costa, fadbdfag capital charge* resulting fromthe standard* total lesa than 6100 (2) the tandards do not cause a major inmate in prices or production costs; and (3) the standards do not cause significant adverse effects on domestic competition, employment, investment, productivity, innovation or competition in foreign markets. This regulation was submitted to the Office of Management and Budget for review as required by Executive Order 12291. Any comments from OMB to EPA and any EPA response to dtose comments are included in Docket Number A-61-21. The docket is available for public inspection at EPA's Central Docket Section, West Tower Lobby, Gallery 1, Waterside Midi, 401M Street SW,, Washington. D.C. 20400. Pursuant to the provisions of 8 U.S.C. 005(b). I hereby certify that this rule, if promulgated, will not have a significant economic impect on a substantial number of email entities because no small entities are affected. List of Subjects in 49 CFR Part tl Air pollution control Asbestos, Beryllium, Hazardous materials. Mercury, Vinyl chloride. Dated: Dated December 31, UM. Ahrfe L. Abe. Acting Administrator. PART 01--(AMENDED) It is proposed to amend 40 CFR Part 61 as follows: 1. The proposed changes to 40 CPU Part 61 proposed at 42 FR 28154. June 2. 1977 are withdrawn. 2. By revising the definitions in existing 16l.6l(j). (1). (o) and jp) for "in process wastewater", "In vinyl chloride service", "ethylene dkhlcrida purification" and "vinyl chfarida purification" and by adding definitions for the terms "relief vahm". leak", "exhaust gas", "relief valve discharge end "3-hour period" in new paragraphs M (w). (x), (y) and fy). 19141 DiWnmsae. V * . r-4> (j) "Inprocess wasterwater" means any water which, during manufacturing or processing, comes into direct contact with vinyl chloride or polyvinyl chloride or results from the production or use of any raw material, intermediate product finished product by-product or watte product containing vtnyi chloride or polyvinyl chloride bat which has not been discharged to a wastewater treatment process or discharged untreated a* wastewater. Gas-holder seal water is not inprocess wastewater until it is removed from the gasholder. 4**6 (1) "In vinyl chloride service" means that a piece of equipment either or contacts a liquid that Is at least 10 percent vinyl chloride byweight or a gas that is at least 10 percent by volume vinyl chloride as determined according to the provisions of 16147(b). The provisions of 161.67(b) also specify how to determine font a piece of equipment is not in vinyl chloride service. This definition must be used in place of the definition of "VHAP service" in Subpart Vof this part. * (a) "Ethylene dichloride purification" includes any part of the process of ethylene dichloride production which follows ethylene dichloride formation. (p) "Vinyl chloride purification" includes any part of the process of vinyl chloride production which follows vinyl chloride ition. (v) "Relief valve" means each pressure relief device including pressure relief valves, rupture disks, vents and other pressure relief systems used to protect process components from overpressure conditions. "Relief valve" does net include control valves used to control flow to an incinerator or other air pollution control device. (w) "Leak" " any of several events that indicate interruption cf confinement of vinyl boride wfthin process equipment Leaksfadude events regulated under Subpart V at this part such as: (1) An instrument reeding of 10400 ppm or greater (2) indications of liquid dripping: (3) a sensor detection of failure of a seal system, failure of a barrier fluid system, or both; and (4) detectable emissions as indicated by an instrument reeding of greater than 860 ppm above background. Leaks also Include events regulated under 161AB(b)(6)(i) of detection of ambient concentrations in excess of background concentration. Emissions of vinyl chloride not regulated under 16141 (a) and (bb 16143(a); 16144 (a), (b). (c), (d). (e) and (f); and 16148 (a) and (b)(1). (b)(2). (b)(3), (b)(4). (bXB), (b)(6), (b)(7) and (b)(9) shall be considered a leak. A relief valve discharge is not aleak. (x) "Exhaust gas" means any offyas discharged directly or ultimately to the atmosphere that was initially contained in or was in direct contact with the equipment for which 10 ppm emission limits are prescribed in 161.62 (a) and (bk 16143(a); 6144 (a)(1). (a)(2), (b). (c) and (d* 16146 (b)(l)(ii). (b)(2), (b)(5). (bXOXV) and (b)(9Xii). A laak as defined In paragraph (wj of this section is not an cthmsigaa. ty) Ttettjfvalve discharge" means any nonlsak discharge through a relief valve. ' (x)"3dfoor period" means any three consecutive 1-hour periods (each hour commendng on the hour). 8. By ^levgtug " all exhaust gases" to "each exhaust gas stream" and making other minor clarifying revisions in 16142(a). 16143(a), and 16144 (a)(1). (b), (c) and (d) as follows: 16141 (a)Ethylene dichloride purification: The concentration of vinyl chloride in aach exhaust gas abeam from any equipment used in ethylene dichloride purification is not to exceed 10 ppm (average for S-hour period or as determined in accordance with 16147(gXl)). except as provided in 181.65(a). Ibis requirement does nqt preclude combining of exhaust gas V'. streams provided foe combined steam is ducted through a control system from whidi the concentration of vinyl chloride in the exhaust gases does not exceed 10 ppm, or equivalent as provided fa 16146. This requirement does not apply to equipment that has been opened. is out of operation, and met the requirement in 161.6S(b)(d)(i) before being opened. f 6143^ Wstian standard ter vinyl An owner or operator of a vinyl chloride plant shall oomply with the requirements of this section and f 61.65 (a) Vinyl chloride formation and purification: The concentration of vinyl diloride fa each exhaust gat stream from any equipment used in vinyl chloride formation and/or purification it not to exceed ppm (average for 3-hour period eras determined in accordance with f 6147(gXlB. except at provided in 16146(a).This raqafrement dose not preclude combining of exhaust gas streams provided the combined steam is ductad through a oeotroi system from which tha oonoantration of vinyl chlorida fa the axbaust gases does not exceed 10 ppm. or equivalent as provided fa f 6148. This requirement does not apply to equipment that has been opened, is out of operation, end met the requirement fa 16l46(bK6)(i) before being opened. CMA 007817 (1) The oonoantrabsn ef vtoyl chforide in each exhaust gas stream from eech reactor is not to oxoead 10 ppm {___ for 3-hour period or as determined to accordance with | *l*7(g)(l)), wept as provided to parapaph (a)(2) of (Ns section and | 6149(a). (b) Stripper. The concentration of vinyl chloride to each exhaust pas stream from each shipper is not to exceed 10ppm (average fort-hour period or as determined to accordance with 161.67(g)(1)), except as provided to 161.69(a). This requirement does not apply to equipment that has been opened, is out of operation, and met the requirement in 161*9(b)(6)(i) before being opened. (c) Mixing, weighing, andholding containers The concentration of vinyl chloride to each exhaust gas stream from each mixing, weighing, or holding container to vinyl chloride eervtce which preoedee the stripper (or the reactor if the plant has no stripper) to toe plant process flow is not to exceed 10 ppm (average for 3-hour period or as determined to accordance with 161.07(g)(1)], except as provided in 161.65(a). This requirement does not apply to equipment that has been opened. Is out of operation, mid met toe requirement in 161.66(bX0Xi) before befog opened. (d) Monomer recovery system. The concentration of vinyl chloride to each exahust gas stream from each monomer recovery eystem is not to exceed 10 ppm (average for 3-hour period or as determined to accordance with 161.67(gXl)l. except as provided in . 161.65(e). This requirement does not apply to equipment that has bean opened, is out of operation, and mat toe requirement to 161*5(bH6)(i) before betogopened. 161.64(a)(2) and by i emu i tog (aXO) " follows: An owner or operator of a polyvinyl chloride plant shall comply with too requirements of this section and f 6169. (a) Reactor. The following requirements apply to l to toe balk baa apply to to toe balk 3. By revising introductory text (eXS) to 161*4 ns W adding paragraph (e) Sourest fallowing the etrippertei. The following reqnlremanta apply to endminai of vinyl chloride to toe atmosphere from the oamhiaetton ef all sources foUewtog the etripperfs) (or the reactors) to toe plant has no mrippasfr)) in tot plant process flow totoadlng bet not limited to. a concentretore. Mend 1 dryers, conveyor air rilac toilpm. baggers, storage containers, and iapmcae* wastewater, except aa provided in paragraph (f) ef this section: 4*4 (3) Ihe provisions of dds perapapb apply at all tones Including when effpecification or other types of reeiae are mads. *. By adding paragraph (f) to 16L64 as follows: 161*4 (f) Reactor need at ttripper. When t nonbulk resin reactor is usedhs a stripper this paragraph maybe applied to lleuof 61*4 (aX2) and (a)(1): ^ used as a stripper from all pedes of polyvinyl chloride rasto stifopad to the r on each calendar day may not ft) 30> |/h (0*0302 to/lb) efpdyetnyt chloride product for diaperriue pelyvtayi chloride resins, excluding latex i with the product detamtoad ea a toy 4liyi)v0to*y2l g/kg (0*0041 lb/l>) ef chloride product far el ether polyvinyl chloride resins, teefadtog latex dry solids basis. (a) Reliefvalve Recharge*, (f) Paiyrfoyl tohdii ptmrts (a latex, and bulk processes). (1) Reactor. The number of discharge* to the atmosphere from relief valves on polyvinyl chloride reactors to vinyl chloride service is not to exceed the following Mmitoexaept as provided in paragraph (aglXHi) of Mils section. For all reactore producing eespanaion resins within a PVCplant, toe number of relief valve dlachaigee bast to exceed0*35 discharges per 100 polymerization frilrhtt itt 4 iUrrlr'--q-- p- ymr p~r all reacton producing dispersion and latex meins within a PVC plant, the number of relief valve discharge* is not to exceed 0035 discharges per 100 polymerizetorn batches For all reactors including prapolymsrixation and postpolymerization reactor*, producing bulk retons within a PVC plant the number ef relief vahra discharges is not to txoaad 0039 discharges per 100 polymerization batches. (H) 11m number of discharges to the atmosphere from relief valve* on equipment (excluding polyvinyl chloride| reactors) to vinyl chloride service is not to exceed 0*25 discharges per 100 pdljumiIllation batches nor > discharges per year except as provided in paragarph (eKIXlii] of this section. (Hi) Tim limits specified in paragraphs (aXl)(l) and (e)(1)(ii) of thi* section may be exceeded when only one relief valve discharge to toe atmosphere occurs during toe 12-month period preceding the close of toe 6-month reporting period. (2) Polyvinyl plants (solution and other continuous PVC production processes). The number of discharges to the ttiDoejtosrefrom relief valves on ail equipment to vinyl chloride service ii not to exceed 1 discharge per year. (3) Ethylene dichloride and vinyi chlorideplants. The aamber of dtochasg** * toe atmospimr* from relief valvae an equipment to vinyl chloride emvtoe leant to axraeri 4 diecheifm per year. (4) Bedh rebel vahra discharge that ooaMbataa to a relief valva discharge ftaipmney to excess of any twit . (a)(1). (a)(2) and (aW)f Me pataynph ommdtmae CMA 007818 me Register / ol, eg No, e / yMauatf, u individual violation ef ikiMpictin limit. -- (5) For every relief valve foscharge to the atmoaptaere. the o^*ror operator (hall record the tdentR|F6fthe icurce. the date and time of discharge, die cenae of the illn liaig^lieainwiii liiiahi total vinyl chloride lorn during the diacharge. and the method seed for determining the vinyl ohioride lose. This information shall be submitted in writing to the Administrator ai pari of the reporting requirements of paragraph 161.70. This information shall be retained and made available for inspection by the Administrator for a minimum of 3 yean. & By revising paragraphs (b)(3), (b)(8)(i). (b)()(iii). (bK8)(iv) and (b)(8)(vi) to 161.65 as follows: 16146 Invasion etwxtord tor ettiyteoe lwensMiWWi fwljfl IIMHNV IV pWjwWiyi eMorids ptants. An owner or operator of an ethylene dichloride, vinyl chloride, and/or polyvinyl chloride plant shall comply jvith the requirements of this section. ()***. (b) Fugitive emission sources (1) * * * (2) * * * (3) Leakage from pump, compressor, and agitator seals: (i) Rotating pumps. Vinyl chloride emissions from seals on all rotating pumps in vinyl chloride service are to be minimised by installing sealless pumps, pumps with double mechanical seals or equivalent as provided in 161.66. If double mechanical seals are used, vinyl chloride emissions from the seals are to be minimized by maintaining the pressure between the two seals so that any leak that occurs is into the pump; by ducting any vinyl chloride between the two seals through a control system from which the concentration of vinyl chloride in the exhaust gases does not exceed 10 ppm; or equivalent as provided in f 6146. (ii) Reciprocating pump*. Vinyl chloride emissions from seals on all service are to be mtnimlzedby iMtalHwg double outboard seels, or equivalent as provided In f 6146. If double outboard seals are used, vinyl chloride emissions from the seals are to bo minimized by maintaining the pressme between the two seals so that any leak that occurs is into the pump: by dealing any vinyl chloride between the two seals through a control system from which the concentration of vinyl chloride hi die exhaust gases does not exceed 10 ppm: or equivalent as provided in f 6146 (iii) Rotating compressor. Vinyl chloride emissions from seals on all . 16146 If douUs amehnieai seals ere used, vinyl dbiorids emissions fcma the seels are to be minimised by - maintaining the pressure between the two seels so that any lank that occurs laInto the compressor, by dmrtfog any vtnyi chloride bsioewi foe rise seels through a control syetm from which the concentration of vinylchkntde in the exhaust gases does not (nosed 10 ppm or equivalent as provided in f 6146 (iv) Reciprocating compressors. Vinyl chloride emissinna from seels on all reciprocating compressors hi vhiyl chloride service are take minimised by installing double outboard seels, or equivalent ss provided in 16146 If double outboard eeels ere used, vinyl chloride amissions from the seels are to be minimized by <mtukiiig the pressure between the two seels so.that any leek that occurs is into the compressor by ducting any vinyl chloride between dm two seals through e control system from which foe concentration of vinyl chloride in the exhaust gases does not axosid 10 ppm; at equivalent as provided in 16146 (v) Agitator. Vinyl chloride emissions from seals on all agitators in vinyl _ chloride service are to be minimized by Installing agitators with doubts mechanical seals, or squivalent as provided in 16146 If double mechanical seals are used, vinyl chloride emissions from the seal* are to be minimized by maintaining the piBeams between the two eeels so that any leak that occurs is info tha agitated vessel; by ducting any vinyl chloride between the two seels throng a control system from which the concentration of vinyl chloride in the exhaust gases does not exceed 10 ppm; or equivalent as provided in 16146 (6) Iv* . (!) It tndudas a reliable and accurate vinyl chloride monitoring system for detection ef major leeks and ' IdMitifitttioB of tefnml ini of tin plant where a leek is located. A vinyl chloride monitoring system meane e . device which obtains air sample* from one or more points on a continuous sequential basis and analyses the samples with gas chromatography or. if the owner or operator sssumee diet all hydrocarbons measured are stnyl .. chloride, with infrared spectrophotometry, flame ion detection, or an equivalent or alternative msthird # * * # ' t . m It (ttlklnfrrss eeoeptable calibration and wjiwuim schedule DQ piUW H|UIUUUvQb fl|CfV>Tv the vfoyt drimNe monitoring system, e daily span check is to be contacted with concsntretienof vtoyl tfrloride equal to the ccnomitmrton defined as s leak anwrdfoj toparagraph (b)(8)(vi) of this seWemThe ea&bntion is te be done . {A) A adflnstton pa mixture prepared from the gases specified in sections 661 end 544 of Test Method Mg and in accordance with section 7.1 of test Method 106 or 9) A calibration gee cylinder standard "p--im"g the appropriate oonoeatieltoa at vinyl chiwide. The gas composition of the calibration gas ayiinder standard is to have been certified by the manufacturer. The manufacturer must have recommended a maximum (half Ufa for each cylinder so that the concentration does not change greater then 5 percent from the certified value. Tne data of gas cylinder preparation, certified vinyl chloride concentration and recommended maximum shelf life muit have been ~ - ftiTM< to tha cylinder before shipment' from the manufacturer to the buyer If a gas chromatograph is used as the vinyl chloride system, these gas mixtures may be directly used to prepare a chromatograph calibration curve aa described in aection 74 of Test . Method 106 The requirements bisection 544.1 ana 5 3.3.3 of Teat Method 106 for certification of cylinder standards and for astabliahmant and verification of calibration standards sre to be foUowed. (iv) The location and number of points to be monitored end the frequency of monitoring provided for in the program era acceptable whan they era compared with the number of piece* of equipment in vinyl chiorid* aandce and the size and physical layout of the plant ft 6 (vi) It oantaina a definition of leak which is acceptable when compared with foe background concentrations of vinyl chloride In tha area* of the plant to be monitored by the vinyl chloride monitoring system. Measurements of hackgrowKi concentration* of vinyl chloride In the areas of tha plant to ha monitored by foe vtnyi chloride monitoriim system are to be induded with foe description of the program. The definition of leek for e given phmt may vary nunig the different erase within foe plantand is also to change over time as background ommentratfons in foe plant arajedaced. CMA 007819 / Vol. 50, No. 6 / Wednesday. January 9, 1985 / Proposed Rules 1197 9. By revising paragraph (b)(4),to 161.66as follows: I S1.SI EnMon standard for ethylene UNUfNIV pwn * * * (b) Fugitive emission sources. t * I * (4) Leaks from relief valves. Vinyl chloride emissions due Urleaks from each relief valve on equipment in vinyl chloride service shall comply with I 61.242-4 of Subpart V of this part. 6 * *6 10. By revising paragraph (b)(7) of | 61.65 as follows: f 1.19 BJMMOH IMfln 1W NIJflMV BRnmiHt vmyi OnwnH m ONOfldl plflfMSa t 4 4t (b) Fugitive emission sources. * ** (7) Samples. Unused portions of samples containing at least 10 percent by weight vinyl chloride are to be returned,to the process or destroyed in a control device from which the concentration of vinyl chloride in the exhaust gas does not exceed 10 ppm. Sampling techniques are to be such that sample containers in vinyl chloride are purged into a closed process system. 11. By revising paragraphs (b)(6) introductory text (b)(8)(ii). and (b)(8)(v) to 161.65 as follows: lg lotI.jHi Esfmfnlt^ilwOvAi fMttHwvidnsvwd fnowr iotstswsytreorfrioi flMMnBVt WiyV UVUOfVUV W PQfyTinyf cvwonov pwnli (b) Fugitive emission source* 44444 (8) Leak detection and elimination. Vinyl chloride emissions due to teaks from equipment in vinyl chloride service are to be minimized by instituting'and implementing a lead detection and repair program consistent with the provisions of Subpart V of this part The. program is to be implemented within 90 days of the effective date of these regulations, unless a wafVer of compliance is granted under 16l.ll. Approval of a program will be granted , by the Administrator provided be finds:' (i) * * * (ii) It includes a reliable and accurate portable hydrocarbon detector to be used consistent with the provisions of Subpart V of this part An owner or operator is exempt from f 61.242-l(d), || 61.242-7 (a), (b) and (c). 161.246 and 161.247 of Subpart V of this part for any process unit in which the percentage of leaking valves is demonstrated to be equal to or less than 2.0 percent as determined in accordance with the following: (A) A performance test as specified in paragraph (b)(8)(ii)(C) of this section shall be conducted initially within 90 days of the effective date of these regulations, annully and at times requested by the Administrator. (B) For each performance test, a minimum of 200 or 90 percent of the total valves in VOC service (as defined in I 60.481 of Subpart W of Part 60) within the process unit shall be randomly selected and monitored within l week by the methods specified in 161.245(d) of Subpart V of this part. If an instrument reading of 10.000 ppm or greater is measured, a leak is detected. The leak percentage shall be determined by dividing the number of valves in VOC service for which leaks ate detected by the number of tested valves in VOC service. (C) If a leak is detected, it shall be repaired in accordance with 161.242-7 (d) and (e) of Subpart V of this pari (D) The results of the performance test shall be submitted in writing to the Administrator in the first semiannual report following the performance test as part of the reporting requirements of 161.70. (E) Any process unit in which the percentage of leaking valves is found to be greater thaw 2.0 percent must comply with all provisions of Subpart V of this part within 90 days. 44t4 (v) It contains a plan of action to be taken when a leak is detected consistent with Subpart V of this part 12. By revising 161.66 as follows: 161^6 tquNalen* sautpmsm and Upon written application from in owner or operator, the Administrator may approve use of equipment or procedures which have been demonstrated to his satisfaction to be equivalent in terms of redudng-vinyl chloride emissions to the atmosphere to those prescribed for compliance with a specific paragraph of this subpart 13. By revising paragraph (fjbf 161.67 as follows: 16167 ietaslen testa. ** 4 (f) The owner or operator shall retain at the plant and make available, upon request for inspection by the Administrator, for a minimum of fcyears. records of emission test results and other data needed to determine emissions. 14. By revising paragraphs (g)(3) introductory text (g)(3)(i), and (g)(3)(iii) of 161.87 as follows: ( 81.S7 emission testa. *9 (g) * * * (3) Wbpn a stripping operation is used to attain.the emission limits in 161.64 fe) and (0, emissions are to be determined using Test Method 107 as follows; (i) The number of strippers (or reactors using as strippers) and samples and the types and grades of resin to be sampled are to be determined by the Administrator for each individual plant at the time of the test based on the plant's operation. (ii) * * * (iii) The corresponding quantity of material processed by each stripper (or reactor used as a stripper) is to be determined on a dry solids basis and by a method submitted to and approved by the Administrator. 15. By revising paragraph (g)(5) introductory text and adding paragraph (g)(6) to | 61.67 as follows: ' 16147 Cmtaeiow testa. 6 * (g) * * (5) The reactor opening loss for which an emission limit is prescribed in 16144(a)(2). is to be determined. The number of reactors for which the determination is to be specified by the Administrator for each individual plant at the time of the determination based on the plant's operation. ** * * (6) For a reactor that is used as a stripper, the emissions of vinyl chloride from reactor opening loss and'all sources following the reactor used as a stripper for which an emission limit is prescribed in 161.64(f) are to be determined. The number of reactors for which the determination is to be made is to be specified by the Administrator for each individual plant at the time of the determination based on the plant's operation. (i) For each batch stripped in the reactor, the following measurements are to be made.: (A) The concentration (ppm) of vinyl chloride in resin after stripping, measured according to paragraph (g)(3) of this section: (B) The reactor vacuum (mm Hg) at end of strip from plant instrument; and (C) The reactor temperature (*C) at end of strip from plant instrument. CMA 007820 1188 Fodnml BegUtar / VoL SO. No. a / Wedanaday, J--uwy a 1888 / (ii) For oach batch stripped in the reactor, the following Information is to be determined: (A) The vapor pressure (mm Hg) of water in the reactor81 end'ef oMp hem the following table: v*ap0or too IS4> uvrQ ip* C w* ret 578 PM IS 40 964 41 4t 14 40 ft*4 44 l3 4ft 7T# 4ft 794 47 40 3.7 40 m.o SO U4 1 74 9ft IMt S3 1074 *4 IlftS 96 11*4 Oft 12SJ 57 12*6 1M.1 60 14*4 1 106-4 ft mt m 1714 4 17U S 1*74 m 1MY m KM m M4i m m.7 TO 017 71 2414 7ft Oil > at? 74 1712 78 mt m S414 77 94.9 70 3ft74 7* 49.0 60 668.1 1 m7 t ast a 4a ft4 49ftJ a 46M a 4504 a m.7 a m.% a aai a SB! a m* a as a aM m Mil m Ml a aro w at.t m 9074 m 73U m *a.o (B) The partial pressure (mm Hg] of vinyl chloride in reactor at end of strip from the following equation: PPVA-7S0-RV-VPW Where: PPVC-psrtUl pressure of vinyl cMood*. ia mmHg 7eoatauMplMric piswere at fX. ia am Hg RV^sbsoiots value of eMcSer vscnuim. hi mmHg VPW-vaper prsssme f wsmr. h mm Hg (C) The reactor vapor specs voluma (m*) at end of strip from the following equation: nmv.nc-wv- whsras RVSV- RC-taactor sepsdty. hi m* WV-votmsdi In m* tarn* PVCW-Ay wttght ripriyvW< ihlsride hi leader from Mdpe.to kg 833-typical density sfpolyvinyl dMfr, h kg/** ..i (hi) For aach batch stripped in the . reactor, the combined reactor < loss and mwiaaiona from all i following the reactor emd as a stripper is to be determined using the following aquation: (PPVCKRVSVKidaz) C-PMVCX10-1+ (pvcmnfim i id v Cj vinyl AW product FVMVC--eancentraSenafvtagd Aknida la 10-v WHhhgBldihisi RVSV-r determined wcwdiag te paragraph (g)(epuc)afthis sactWk to m* 1.002-Ideal gas constant tn g--T/e e'hrihfldWdi PVCW-Wymlgfat sfpulpilujjl AImMs hi ZftlooovaiAmWtorW^tolC RT-rnamar hmywatom. In X 18. By adding paragraph (h) to 18U7 as follows; Ml) Bach piece of equipment within a process unit Ae! can renaanahly contain squlpmaot A riwyt chleride service is pmeanod te be hi vtnyi chloride saeetce mini m owner er operator demonstrates that the piece of equipment it net A ring) chloride sendee. For a piece of omripnent to be considered not fat vinyl Aloride aerates, it must be determined that fee percent vinyl chloride content on be mneanafaly expected not to exceed 10 percent by weight for liquid streams and 10 percent by volume for gas streams. For purposes of determining the percent vinyl chloride content of the process fluid that is contained in m aemferi equipment, procedures that conform to the methods described to MIM Mrihod D-C87 (incorporated by reference no i in 18148) Anil be arod. (1X1) An owner or < may m engineering judgment rather thasnam1 e procedures in paragraph (h)(1) of Ala section to f vinyl < 10 percent by wvigbt far Horrid and 10 percent by volume lor g streams, prodded Ant the Judgment demonatrstae that I chloride content dearly doe* not exceed 10 percent. Whan an owner or operator and Ae AdministnW de net epee on whether a piece of equipment to not hi vinyl chloride sendee, howevw. the procedures A paragraph Ml) f Ihto section shall bn used to meins the disasesemaU (lijlf an own that s piece of aqripnvent is A day! chloride service, the determinetieo < be revisedonly efler following the procedures in pampapb (bMl)of this aactiocL pireWWpTAWida cootowtahaD be repreae^tive A the process fluid that to contetood to or cantoris the equipment. 17. By adding paragraphs (dh M and (f) to 1810S as follows: 18108 i* (d) Wham exheaet gas(es). haring emission limit! that are subject to the requirement of parapaph (a) ef this section, we emitted to the atmosphere around tW ceattel ryitom and reqeired vtoyf dderide mcnitortag system, the vinyl chloriito oontont af the emisrion shall be cricdetad (in eaits ef aacheppliceble emhmtae IWtt) by beet V practical eagteeertag Judgment based on the dtoAaige dumtton and known VC concaoWaboea in the affected ' equipments determined in accordance with 10807(h) <m other acceptable method. (o) For each 3-hour period, the vinyl chloride content ofemissions subject to dtotequirenunts of paragraphs (a] and (d) of this section shall bo averaged (weighted aooordtog to the proportion of time that emissions were continuously monitored and that amissions bypassed the conttnnowe monitor) for purposes of (spurting excess emissions under | eiJTgcXl). <n PureMb vinyl cUortee emission to ttis atmnaphwi itotormlnail In ainiiBilseiii whh paragraph fe) of this sactioo to be to encase ef the applicable shall record the identity of the source(t), the data, IWe. and dwettonaftos chloride loss during the excess amission, and toe method wed for detornAAig the vinyl (Morido tom.This hifonneflou shall be retetoed end made available for inspection by 1fao AdninisWator as requited by | MJl(e). el ' to "Reporting'' and by reviriag paiaveph (e) ef IAJO as follows: , , 0078 21 CM* / VoL g No. 6 / Wad MBS / Rules tsn 1*1.70 vinyl chloride content in the polyvinyl vihyl chloride concentration, as . (a)(1) The owner or opmior of any ourca to which t)s sobpart applies shall submit to fonAdaitotetratoron September IS and Much U of sachVear chloride resin. ()*** (U) * * * (Ui) The vinyl chloride content in each determined in this paragraph in excess of the limits prescribed in 16144(e). The vinyl chloride contentfoundin each aampl* required by paragraphs (cKXKi) a report in writing oantataiite the information instead m pai ssi enha. (c). sample is to be determined by Test Method 107 as prescribed In and (cKtNU) at this section shall be averaged separately for such type of (d) and (e) of this mMoo and on 161.67(g)(3). resin, overeach day and December 15 and Jana 15 at each year a (iv) [Reserved] weighted according to the quantity of report in writing the (v) The report to the Administrator by each grade of resin processed by the information required in paragraph (e) of the owner or operator is to induda a atripperfa) that calendar day. according this section, except as provided in record of any 24-hour average resin to the following equation: paragraph (a)(2). (2) In the case of an existing source that submits semiannual reports on an approved fixed schedule other than September 15 and March IS, the approved semiannual reporting schedule ` Vrt "wr snail be used to report the information required in paragraphs (c), (d) and (e) of this section. In addition, the information include a statement that axceea required in paragraph (e) of this section A -24-hour average eancentratloB of type. 75 amissions have not bean detected. will be reported exactly 3 months following the semiannual reporting dates. (3) The first report is to be submitted following the first full 3 month reporting period after the initial report is submitted. reein in ppm (dry weight basis). QmTotal production of typo 75 reein over the 24-hour period, ta kg. T -Type of resin: /--1.2.. .m where m is total number of note types produced during the 24-hour period. Af--Concentration of vtayi in one sample of grade Gt reein, in ppm. 22. By adding paragraph (c)(4) to |61.70asfofiows: *1J6 (e) * * * 19. By revising paragraph (cHl) of 161.70 as follows: 1*1.70 /-Production of grade G reein represented by the mmple. te kg. Grade of raoim 94, Gt Cs end Cs o-Total number of pedaa ofreWnpnxteced during the 31 hour period. (4) In polyvinyl chloride plants for which stripping In the reactor is used to attain the amteaion level prescribed.in 16144(f). the owner or operator shell induda te foe report record offoe Id*** (1) The owner or operator shall include in the report a record of the vinyl chloride content of emiUfons for each 3-hour period during which average emissions are in excess of the emission limits in 161.62 (a) or (b), 161.63(a). or ( 61.64 (a)(1), (b). (c), or (d), or during which average emissions are in'excess of the emission limits specified for any control system to which reactor emissions are required to be ducted to161.64(a)(2) or to whickfogitive emissions are required ton* ducted hi 161.65 (b)(i)(U). (hM2). (b)(3), (bUaXiik or If no 24-honr ayiragrraatn vinyl chlorido ooncaattatians to axoass of the limits proscribed te 16144(e) am. measured, the report shall state that no excess reein vinyl s concantratione were measured. (vi) The owner oroperateeahall ratate at the uinms Miiisaks^esllsMsIiv inspection by tbs Admtateteeter for a minimmn of 3 yuan rocante of all dateneeded to furnish tbs information ,,.ri required by paragraph (cX2Xv) of this section. The raaorda asa la mntaln foa^following informatfocu . vinyl chloride emissions from reactor opening loea and all sources following the reactor used as t stripper. (i) One representative sample of polyvinyl chloride resin is to be taken from each batch of each grade of resin fy following tea completion of the stripping operation, add Identified by resin type and grade and foe date and time foe batch te completed. The corresponding quantity of material processed in each stripper betch lb to bif racorited.and tdentlfled by resin type and gfrde and the date and time foe batch te completed. (b) (9)(ii). If emissions in excess of tb*.,.*.. (A) Ml- emission limits are not detected, lbs -- (B)* * * V tit* \*m -. (11) The vinyl chloride content in each' ' --TMple ia to be determined by Test report shall contain a statement that no Method 107 as presetbedin excess emissions have been dqJnslA^ The emissions arp to be determinedin accordance with J 6LMM. 21. By ravisteg paragraph (cX3) of teiJOasMfows; ' , , 20. By revisingpanpmp (c)(2) " ' ` ", |IUI 16147(g)(3). (Ui) The combined emission from reactor opening toes and all sources following foe reactor ased as a stripper introductory text, ranweteg paragraphs. (c) (2)(iv). revising panpaph (cX2)(iil) and revising (cXXXv) and (cX2Xvi) introductory text to 16L70 as follows: (CJ* * * (3) The owner or operator shall induda in the report a record of any are to be ttetarmfied for each batch tripped te a reactor according to foe procedure prescribed in 16UT(g)(6). (tv) Tbe report to foe Administrator by 1*1.76 emissions from sack reactor opening in the owner or operator is to include s axoass of the emission (baits proscribed record of any 24-hour average combined (c) * * * (2) In polyvinyl chloride plants for which a stripping operation is used to attain the emission level prescribed in 161.64(e), the owner or operator shell include in the report a record of the te 16l44(aX2). afo to be Withl eiATUXS). except tfaeftaflBtkn*' for each reactor are to ba detetminad. If emissions te excess of tbe amteaion limits art not detected, tbs report shall reactor opening loss and amissions from all sources following foe reactor used as a stripper as determined lb this paragraph, to excess of foe limits prescribed te 16144(f). The combined reactor opening loss and amissions from CMA 007822 tmi________Federal Register / Vol. 80, Wo. B / Wednesday, frmufy t. tB65 / ftapioied itules W.... ........... all sources following tbs reactor used a> a atripper aasoctotod with onch batch arc to be averagadrepsratsiy for each type of ream, oraraach ii" day and weighted acnmdtov* the quantity n C F* C1-1 S1 61 --5----------- Where: A 24-hour avenge combined raactor opening loss and eunauon* bom *B aource* following the raactor uaed a* a atripper, in g vinyl chloride/kg product (dry weight basis). Q--Total production of raain in batches for which shipping is completed daring the 24-hour period. fa kg. C-Average combined raactor opening to** and emission* bom all aouroas fallowing the raactor uaed a* a atripp* of all batches of grade Gt resin for which stripping is completed dating the 2* hour period in g vinyl chioride/kg product (dry weight besit) (determined eccording to procedure prescribed in | SU7(g)(6)). P--Production of grade C. reein in the batch** for which C ia detetmined. in kg. G( -Grade of reein: eg. Gi. Ck. and G. n--Total number of gradee of taein in batches for which (tripping ia completed during the 24-hour period. If no 24-hour average combined reactor opening loss and amissions from all sources following the reactor uaed a stripper in excess of the limit* prescribed in f 61.M(0 are determined, the report shall state that no excess vinyl chloride emissions were determined. 23. By adding paragraphs (d). (a) and (f) to | 01.70 at follow*: (1.70 fraperthig. (d) The owner or operator shall include in the report a record of rehaf valve dischargee aa prescribed is ( 01.05(a)(4), and the owner or operator shall report avreadannre of the relief velve discharge frequency Units prescribed to 10140(a) to be determined as follows: (1) For polyvinyl chlartdo plants producing dispersion, latex or bulk resin*, the relief valve discharge frequency bore polyvtoty chloride reactors ia to be determined using the following equation. Separate calculations are to be made for each resin type (t) aa defined: of each pade of reein alilppad in reactor* that calendar day at follow*: For each type of resin (suspension, dispersion, latex, bulk, other), the following cafcnlatiOH is to be peifoimed: + P62 CG2 W N N when f_ (slfaf yphs dfarhefai iiiieani j per ITT polypMriretoa batton bom sQ equipment (excluding taadeev) .'Ft --relief valve discharge frequency par 12aronth period from ail equipment (xduimg raoeton) N-- total number Of relief velve discharge* during the 12-uionth period preceding the dare of toe > month raporting period from oil eqetpment (excluding reactors) Y-totd afanbreof poiymartutioa batches of all rasto typos emdtoad divided by too Where F,--relief valve discharge frequency per 100 polymerization batches from all reactor* restoring rasing typtt N--total nrnabw <d ralkd vahv dfachaqps toring fas 13-mareb period psaeedtogdw dost of the *-month repertfag parted from ah reactors producingreein type t Y-total oembsr ef polymerization batches of ratio typo Uhtring the 12-mosth period preceding tho dote of (be 6-month reporting period divided by 100 t-raain type: disponicai (tadadtog latex) er bulk reain type ft) For poly vinyl chloride plants producing suspension resins, the relief valve discharge fraqusmrj bore poiyvtoyl chloride reactors to to be determined in two ways aatog the following equation*: F--relief valve discharge frequency par 100 polymerisation batches from all raacton producing suspension raain F,i -relief vaivt discharga frequency per 12month period from all raacton producing suspension raain N-total aamtwr ef relief valve discharges during th* 12-month pawed paanedieg the dose at the 8-mooth reporting period from all raacton produdag reapensfau raain Y--total number of polymerisation belches of suspension rasin during the 12 month period preceding the dose of the I month rapacting period divided by 108 (3) hr polyvinyl chloride plants producing auapawdsn. dfaporafan. latex, or bulk resins, the rehef valve dtochmgo frequency from all other aqtopnwnt (exclndtag poiyvtoyl chloride reactors) ia to be detoimfnad to two ways retog the fulfiliring oqootione: - (4) FOr polyvinyl chloride plants using the solution procasa or any other continuous production process, the relief vaivv discharge frequency ia the summation of each relief valve discharge from all equipment types during me 12-month period preceding the dose of the 0-month reporting period. (5) For ethylene dichtoride/vinyl chloride plants, the relief valve discharge frequency is the summation of each relief vahe discharge fremiti equipment types during the 12-mdnth period preceding the cloee of the 0month reporting.period. (0) A polymerization batch consists of each sequence of charging VC and other materials to the reactor, heating reactor contents, polymerization of reactor and removal ef reactor ooatants including any incomplete sequence that fa aborted after charging VC to the reactor. For bulk reain production plants, a single 'polymerization batch'1 include* both prapolymarizatkm and postpciymerizabon raotoor operation*. - (a) The osmre or aerator shall include in the report the number of relief vafv* discharges to the atmosphere during tlm 3-mzuth period preceding the report from each ef the following soirees: aiupension ream production reactors: dispersion and latex resin production reacton: bulk resin production reactors: ail nonreactor equipment to PVC plants; all equipment used in eobdon process and other continuous process PVC plants; and all equipment to EDC/VC plants; any other OUftE (f) The owner or operator shall include in the report the number of reactor openings and the design capacity of tbs number of polymerisation batches for each type of reein in each plant during the 0-month period preceding the report. The design capacity of the number of polymerization batches may be defined CMA 007823 Fidanl Itoglitot / Voi- 50. No. 0 / WtdawJiy, Janaary 9, 1965 / Proposed Rules -;w. - ...- ... m -4* **- - - - - i'Tiet--itin iji| | initially and remain unchanged unleu ignificant changes to the design capacity occur. 24. By revising paragraph (a) introductory text of f 61.71 as follows; Isi.7i nii iiiUiuM (a) The owner or Operator of any source to which this subpart applies shall retain the following information at the source and make it available for inspection by the Administrator for a minimum of 3 years: s 23. By adding the words "vinyl chloride" to the definition of the term "volatile hazardous sir pollutants" in 161.241 of Subpart V as follows: 141.241 OeWnWona. "Volatile hazardous air pollutant" or "VHAP" means a substance regulated under this part for which a standard for equipment leaks of the substance has been proposed and promulgated. Benzenq is a VHAP. Vinyl chloride is a VHAP. (Sec. 112 Clean Air Act of 1S7S) (FR Doc. es-m Filed 1-8-85; 845 am] 1201 CMA 007