Appendix M Adopted State MeasuresTABLE OF CONTENTS

**I. New Source Review Regulations ..................**

**................................................... ........................................1** 

**A. South Carolina Air Pollution Control Regulation R. -**  Definitions, and General Requirements, ......

Section II - Permit Requirements

**................................................... .................................................. 1** 

**B. South Carolina Air Pollution Control Regulation R. 61-62.5, Std. No. 7 -**  Prevention of Significant

Deterioration

**................................................... ...................................................**  **.............................. 1**

**C. South Carolina Air Pollution Control Regulation R. 61-62.5, Std. No. 7.1 -**  Nonattainment New ....

Source Review

**................................................... ...................................................**  **............................ 1**

**II. NOx Regulations...............................**

**................................................... ...................................................**  **2**

**A. South Carolina Air Pollution Control Regulation R. 61-62.5, Std. No. 2 -**  Ambient Air Quality ......

Standards

**................................................... ...................................................**  **.................................... 2**

**B. South Carolina Air Pollution Control Regulation R. 61-62.5, Std. No. 5.2 -**  Control of Oxides of ...

Nitrogen (NOx)

**................................................... ...................................................**  **........................... 2**

**C. South Carolina Air Pollution Control Regulation R. 61-62.96 -**  Nitrogen Oxides (NOx) Budget .....

Trading Program

**................................................... ...................................................**  **........................ 2**

**D. South Carolina Air Pollution Control Regulation R. 61-62.99 -**  Nitrogen Oxides (NOx) Budget .....

Program Requirements for Stationary Sources Not I n the Trading Program **.................................. 2**

**E. South Carolina Air Pollution Control Regulation R. Regulation 61-62.2 -**  Prohibition of Open ......

Burning

**................................................... ...................................................**  **....................................... 2**

**III. VOC Regulations..............................**

**................................................... ..................................................2** 

**A. South Carolina Air Pollution Control Regulation R. 61-62.5 Std. No. 5 -**  Volatile Organic ............

Compounds

**................................................... ...................................................**  **................................. 2**

**B. South Carolina Air Pollution Control Regulation R. 61-62.5 Std. No. 5.1 -**  Best Available Control

Technology (BACT) / Lowest Achievable Emission Ra te ("LAER") Applicable to Volatile Organic

Compounds

**................................................... ...................................................**  **................................. 3**

**IV. Other State Control Measures..................**

**................................................... ...........................................3** 

**A. Clean Air Interstate Rule ......................**

**................................................... ......................................... 3** 

**B. Permitting Requirements Involving Emission Offs ets - Conditions for Approval ......................**  **..... 3 V. Emissions Inventory............................** 

**................................................... .................................................5** 

**VI. Reasonably Available Control Measures (RACM) ..**

**................................................... ..........................5** 

**A. Reasonably Available Control Technology (RACT).**

**................................................... .................... 6** 

**B. Early Action Compacts ..........................**

**................................................... ........................................ 6** 

**C. Take a Break from the Exhaust..................**

**................................................... .................................... 7** 

**D. Overall RACM Conclusions.......................**

**................................................... ................................... 7** ATTACHMENTS - APPENDIX M2

**SC AIR POLLUTION CONTROL REGULATION R. 61-62.1** Definitions And General Requirements

**SC AIR POLLUTION CONTROL REGULATION R.** 

### 61-62.2 Prohibition Of Open Burning

**SC AIR POLLUTION CONTROL REGULATION R, 61-62.5, STANDARD NO. 2**  Ambient Air Quality Standards

**SC AIR POLLUTION CONTROL REGULATION R.** 

### 61-62.5, STANDARD NO. 5 Volatile Organic Compounds

**SC AIR POLLUTION CONTROL REGULATION R.** 

### 61-62.5, STANDARD NO. 5.1 Best Available Control Technology (BACT)/Lowest Ac hievable Emission Rate (“LAER”) Applicable To Volatile Organic Compounds

**SC AIR POLLUTION CONTROL REGULATION R. 61-62. 5, ST ANDARD NO. 5.2**  Control Of Oxides Of Nitrogen (NOx)

**SC AIR POLLUTION CONTROL REGULATION R. 61-62.5, STANDARD NO. 7**  Prevention Of Significant Deterioration

**SC AIR POLLUTION CONTROL REGULATION R.** 

### 61-62.5, STANDARD NO. 7.1 Nonattainment New Source Review (NSR)

**SC AIR POLLUTION CONTROL REGULATION R.** 

### 61-62.96 Nitrogen Oxides (NO x 

### ) Budget Trading Program

**SC AIR POLLUTION CONTROL REGULATION R. 61-62.99**  Nitrogen Oxides (NO
x ) Budget Program Requirements For Stationary Source s Not In The Trading Program**1** ADOPTED STATE MEASURES

**The South Carolina Code of Laws, as amended, South Carolina Air Pollution Control Regulation R.** 

**61-62 -** Air Pollution Control Regulations and Standards, **has been promulgated as necessary to maintain reasonable standards of purity of the air resources**  **of the State, consistent with the public health, s afety,**  **and welfare of its citizens. This appendix contain s the regulations and standards that have been**  **promulgated and other State initiatives that have b een implemented which include enforceable emission**  **limitations, and such other control measures, means or techniques as may be necessary or appropriate t**  **o provide for attainment of the 8-hour ozone NAAQS.**  **The following is a brief synopsis of the ozone control measures already implemented in the RFATS M**  **PO nonattainment area in South Carolina:**

I. New Source Review Regulations

**On December 31, 2002, the EPA finalized revisions governing the New Source Review (NSR)**  **program. The major NSR program is a preconstructio n review and permitting program applicable to new**  **or modified major stationary sources of air polluta nts. In areas not meeting health-based NAAQS, the**  **program is referred to as the Prevention of Signifi cant Deterioration (PSD) program. Collectively, th**  **ese programs are commonly referred to as the major NSR**  **program.**

**In accordance with EPA's final rule revisions, sta te agency programs must adopt and submit**  **revisions to their SIPs to include the minimum prog ram elements outlined in the final rules. States m**  **ay choose to adopt provisions that differ from the fin**  **al rules; however, to be approvable under the SIP, the**  **state must show that the regulation is at least as stringent as EPA's amendments.** 

**After a lengthy stakeholder process, SCDHEC submit ted revisions to the Legislature in January 2005**  **to comply with the EPA requirements. The revisions adopted by SCDHEC differ from the federal**  **revisions in several key respects and have the effe ct of being more stringent than the federal rules.**  **These revisions were approved by the General Assembly and**  **became effective upon publication in the** State Register **on June 24, 2005. The final regulations promulgat ed amendments to regulations R. 61-62.1,**  Definitions and General Requirements **, and R. 61-62.5, Standard 7, Prevention of Signifi cant**  **Deterioration, and also promulgated a new regulatio n, 61-62.5, Standard No. 7.1,**  Nonattainment New

Source Review.

A. South Carolina Air Pollution Control Regulatio n R. - Definitions, and General Requirements, Section II - Permit Requirements

**This regulation implements a program for the minor new source review permitting program which**  **enhances the State's prevention of significant dete rioration of air quality initiatives.** 

B. South Carolina Air Pollution Control Regulatio n R. 61-62.5, Std. No. 7 - Prevention of Significant Deterioration

**This regulation implements a program for the preve ntion of significant deterioration of air quality f**  **or sources located in or proposing to be constructed i**  **n an unclassifiable/attainment areas of the State.**

C. South Carolina Air Pollution Control Regulatio n R. 61-62.5, Std. No. 7.1 - Nonattainment

New Source Review

**Sources located in or proposing to be constructed in nonattainment areas are subject to the**  **requirements of Regulation R. 61-62.5, Std. No. 7.1**

**. 2** 

II. NOx Regulations

**These regulations specify the requirements for con trolling NOx and for demonstrating compliance** 

**with NOx limitations and the NOx SIP Call.**

A. South Carolina Air Pollution Control Regulatio n R. 61-62.5, Std. No. 2 - Ambient Air Quality Standards

**This regulation contains the State of South Caroli na ambient air quality standards which have**  **recently been amended to include the 8-hour ozone s tandards.** 

B. South Carolina Air Pollution Control Regulatio n R. 61-62.5, Std. No. 5.2 - Control of Oxides of Nitrogen (NOx)

**This regulation contains the NOx control standards applicable to affected stationary sources that emi**  **t or has the potential to emit NOx generated from fue**  **l combustion.**

C. South Carolina Air Pollution Control Regulatio n R. 61-62.96 - Nitrogen Oxides (NOx) Budget Trading Program

**On October 27, 1998, the EPA finalized a Nitrogen Oxides (NOx) State Implementation Plan (SIP)**  **Call Rule. The NOx SIP Call was designed to reduce the regional transport of ground-level ozone**  **through reductions in NOx from electric generating unit (EGU) sources and from some non-EGU sources.**  **The rule requires that, beginning in 2004, NOx redu ctions must occur during ground-level ozone season** 

**in states whose NOx emissions have been identified as contributing to 1-hour ozone standard non**  **attainment in "downwind" states. The rule also req uires states to identify pollution-reduction measur**  **es and develop a plan to achieve these reductions.** 

**Each state subject to the NOx SIP Call regulation has a NOx budget that the state allocates to**  **applicable sources. The budget is based on cost-ef fective reductions in emissions that can be achieve**  **d by**

**the affected sources. South Carolina's state tradi ng program budget, as specified in Regulation 61-62**  **.96, Nitrogen Oxides (NOx) Budget Trading Program, is 19**  **,678 tons. The NOx SIP Call regulation will be repealed after 2009 upon implementation of the Clea**  **n Air Interstate Rule.**

D. South Carolina Air Pollution Control Regulatio n R. 61-62.99 - Nitrogen Oxides (NOx) Budget Program Requirements for Stationary Sources Not In the Trading Program

**This regulation details the requirements for contr olling NOx emissions from Cement Manufacturing.** 

E. South Carolina Air Pollution Control Regulatio n R. Regulation 61-62.2 - Prohibition of Open Burning

**The revision of Regulation 61-62.2 - Prohibition o f Open Burning, includes a ban of certain open**  **burning during the ozone season for additional cont rol of NOx emissions.** 

III. VOC Regulations

A. South Carolina Air Pollution Control Regulatio n R. 61-62.5 Std. No. 5 - Volatile Organic Compounds

**This regulation contains requirements for controll ing VOCs.** **3**

B. South Carolina Air Pollution Control Regulatio n R. 61-62.5 Std. No. 5.1 - Best Available Control Technology (BACT) / Lowest Achievable Emiss ion Rate ("LAER") Applicable to Volatile Organic Compounds

**This regulation contains requirements for statewid e BACT for controlling VOCs.** 

IV. Other State Control Measures

A. Clean Air Interstate Rule

**On March 10, 2005 the EPA finalized the Clean Air Interstate Rule, also referred to as CAIR. On**  **May 12, 2005, CAIR was published in the** Federal Register

**.**

**CAIR affects 28 states and the District of Columbi a, whose emissions of sulfur dioxide (SO**  **2 ) and/or** 

**NO**

**x produced by EGU sources and some non-EGU sources c**  **ontribute significantly to the nonattainment of the National Ambient Air Quality Standards (NAAQ**  **S) for fine particles (PM2.5) and/or 8-hour ozone in downwind states. (SO**  **2 and NO** 

**x are both precursors to ground-level ozone formatio**  **n, and NO**

**x is also**  **a precursor to PM2.5 formation.) The EPA has deter mined that EGU sources in South Carolina are**  **affecting the nonattainment of ozone and PM2.5 stan dards in downwind states. CAIR is a cap-and-trade**  **program for NO**

**x**

**and SO 2**  **emissions from affected facilities and has two pha ses of implementation:** 

**Phase I which begins in 2009 for NO**

**x (annual and ozone season) and 2010 for SO**  **2 ; and** 

**Phase II which begins in 2015 for both pollutants**

**.**

**CAIR was due for submission to the EPA for approva l on September 11, 2006. South Carolina is**  **one of many states that did not meet this deadline because of a lengthy regulatory process. SCDHEC is**  **working closely with EPA Region 4 toward implementa tion of the State's rule. SCDHEC has adopted the** 

**federal CAIR with modifications in areas where the state has flexibility. A Notice of Drafting was**  **published in the** State Register **on July 22, 2005; a second Notice of Drafting was published in the**  State Register **on February 24, 2006. The initial approval to proc eed with the proposed regulation was given by**  **the SCDHEC Board on September 14, 2006. The Notice of Proposed Rule was first published in the**  State Register

**on October 27, 2006. A public hearing before the SCDHEC Board was held on January**  **11, 2007. On January 22, 2007, the proposed regula tion was submitted to the South Carolina Legislatur**  **e for approval. In March of 2007, SCDHEC submitted a**  **request to EPA Region 4 for parallel processing. SCDHEC anticipates the proposed regulation to becom**  **e state-efffective upon publication in the** State Register **in mid-Summer 2007. South Carolina is working wit h USEPA to complete the parallel**  **processing at this time.**

B. Permitting Requirements Involving Emission Off sets - Conditions for Approval

**If SCDHEC finds that the major stationary source o r major modification would be constructed in an**  **area designated in 40 CFR 81.341 as nonattainment f or a pollutant for which the stationary source or**  **modification is major, approval may be granted only if the following conditions are met:** 

**(A) The major stationary source or major modifica tion is required to meet an emission**  **limitation which specifies the lowest achievable em ission rate (LAER) for such source.** 

**(B) The applicant must certify that all existing major sources owned or operated by the**  **applicant (or any entity controlling, controlled by , or under common control with the applicant) in th**  **e 4** 

**same State as the proposed source are in compliance with all applicable emission limitations and**  **standards under the Clean Air Act (or are in compli ance with an expeditious schedule which is Federall**  **y enforceable or contained in a court decree).** 

**(C) The owner or operator of the proposed new maj or stationary source or major modification** 

**will obtain sufficient emission reductions of the n onattainment pollutant from other sources. Emission**  **reductions shall be in effect and enforceable prior to the date the new source or modification commenc**  **es operation. The emission reductions shall be obtaine**  **d in accordance with the following provisions:**

**(1) Where the permitted emissions limit allows g reater emissions than the potential to emit**  **of the source, emissions offset credit will be allo wed only for control below this potential;** 

**(2) For an existing fuel combustion source, cred it shall be based on the allowable**  **emissions for the type of fuel being burned at the time the application to construct is filed. If the**  **existing**

**source commits to switch to a cleaner fuel at some future date, emissions offset credit based on the**  **allowable (or actual) emissions for the fuels invol ved is not acceptable, unless the permit is conditi**  **oned to require the use of a specified alternative control**  **measure which would achieve the same degree of**

**emissions reduction should the source switch back t o a dirtier fuel at some later date.** 

**(3) (a) Emissions reductions achieved by shuttin g down an existing source or curtailing**  **production or operating hours below baseline levels may be generally credited if such reductions are**  **permanent, quantifiable, federally enforceable, occ urred on or after the date of the most recent emiss**  **ions inventory, and if the area has an EPA-approved atta**  **inment plan.**

**(b) Such reductions may be credited if the shut down or curtailment occurred on or**  **after the date the new source permit application is filed, or, if the applicant can establish that the**  **proposed new source is a replacement for the shutdown or cur**  **tailed source, and the cutoff date provision of paragraph (d)(C)(iii)(a) of Standard 7.1 are observ**  **ed.**

**(4) No emissions credit may be allowed for repla cing one hydrocarbon compound with**  **another of lesser reactivity, except for those comp ounds listed in Table 1 of EPA's "Recommended Polic**  **y on Control of Volatile Organic Compounds" (42 FR 35**  **314, July 8, 1977);**

**(5) All emission reductions claimed as offset cr edit shall be federally enforceable;** 

**(6) Location of offsetting emissions. Emission o ffsets shall be obtained from sources**  **currently operating within the same designated nona ttainment area as the new or modified stationary**  **source. Emission offsets may be obtained from anoth er nonattainment area with the Department's**  **approval only if:**

**(a) The other area has an equal or higher nonat tainment classification than the area in**  **which the proposed source is located; and,**

**(b) Emissions from the other area contribute to a violation of the NAAQS in the** 

**nonattainment area in which the source is located.**

**(7) Emission offsetting ratios. Emission offset s shall be required in nonattainment areas in**  **accordance with the following provisions:**

**(a) Emissions for carbon monoxide (CO), nitroge n dioxide (NO2), sulfur dioxide**  **(SO2), lead (Pb), particulate matter (PM10 and PM2. 5) nonattainment areas shall be offset at a ratio** **5**

**greater than one to one.**

**(b) Emissions for ozone nonattainment areas sha ll be offset for volatile organic**  **compounds (VOCs) and nitrogen oxides (NOx) in accor dance with the following table:** 

**Designation Offset ratios**  **Subpart I >1 to 1**  **Marginal 1.1 to 1** 

**Moderate 1.15 to 1** 

**Serious 1.2 to 1** 

**Severe 1.3 to 1** 

**Extreme 1.5 to 1** 

**(8) Credit for an emissions reduction can be cla imed to the extent that the Department has**  **not relied on it in issuing any permit under regula tions approved pursuant to 40 CFR part 51 subpart I**  **or the Department has not relied on it in demonstratin**  **g attainment or reasonable further progress.**

**(9) Decreases in actual emissions resulting from the installation of add-on control**  **technology or application of pollution prevention m easures that were relied upon in designating an**  **emissions unit as a Clean Unit or a project as a PC P cannot be used as offsets.** 

**(10) Decreases in actual emissions occurring at a Clean Unit cannot be used as offsets,**  **except as provided in paragraphs (f)(8) and (g)(10) of Regulation 61-62.5, St. No. 7.1. Similarly,**  **decreases in actual emissions occurring at a PCP ca nnot be used as offsets, except as provided in**  **paragraph (h)(6)(iv) of Regulation 61-62.5, St. No. 7.1.** 

**(11) The total tonnage of increased emissions, i n tons per year, resulting from a major** 

**modification that must be offset in accordance with section 173 of the Clean Air Act shall be determin**  **ed by summing the difference between the allowable emi**  **ssions after the modification (as defined by paragraph (b)(3) of Regulation 61-62.5, St. No. 7.1**  **) and the actual emissions before the modification (as**  **defined in paragraph (c)(1) of Regulation 61-62.5, St. No. 7.1) for each emissions unit.** 

**(D) The emission offsets must provide a positive net air quality benefit in the affected area as**  **determined by 40 CFR 51, Appendix S, Emission Offse t Interpretative Ruling.** 

**(E) Alternative Sites Analysis. An analysis of al ternative sites, sizes, production processes, and**  **environmental control techniques for such proposed source demonstrates that benefits of the proposed**  **source significantly outweigh the environmental and social costs imposed as a result of its location,**  **construction, or modification shall be required.**

V. Emissions Inventory

South Carolina Air Pollution Control Regulation R. 61-62.1

**-** Definitions, and General Requirements, Section III - Emissions Inventory

**This regulation requires the submittal of emission s inventory information by affected sources.** 

VI. Reasonably Available Control Measures (RACM)**6**

**Reasonably Available Control Measures is a broadly defined term referring to technologies and other**  **measures that can be used to control pollution; inc ludes Reasonably Available Control Technology (see**  **Appendix R - RACT SIP) and other measures.**

**EPA's final 8-hour ozone implementation rule in 40 CFR 51.912(d) pursuant to section 172(c)(1) of**  **the CAA requires the attainment demonstration SIP s ubmittal to include "a SIP revision demonstrating**  **that it has adopted all RACM necessary to demonstra te attainment as expeditiously as practicable and t**  **o meet any RFP requirements." In addition, EPA's RACM**  **policy indicates that areas should consider all candidate measures that are potentially available,**  **including any that have been suggested for the particular nonattainment area. Although areas shoul**  **d consider all available measures, areas need only to**  **adopt measures if they are both economically and te chnologically feasible and will contribute to timel**  **y attainment or are necessary for RFP. Measures whic**  **h might be available but would not advance**

**attainment or contribute to RFP need not be conside red RACM.** 

A. Reasonably Available Control Technology (RACT)

**The case-by-case RACT analysis for existing source s located in the ozone nonattainment area with**  **the potential to emit greater than 100 tons per yea r of NOx and/or VOC is found in Appendix R - RACT** 

**SIP.**

B. Early Action Compacts

**On August 22, 2002, DHEC published a Notice of Dra fting in the State Register announcing its**  **intent to pursue Early Action Compacts (EAC) for th e 8-hour ozone standard. Through the EAC process,**  **local, state, and EPA officials commit to working t ogether to develop and implement plans that will**  **reduce ozone pollution so that areas are attaining the 8-hour ozone standard earlier than would be req**  **uired by the Clean Air Act. Only areas that are attainin**  **g the 1-hour ozone standard are eligible to partici pate in**  **the EAC process. The compact requires these areas to attain the 8-hour ozone standard by December 31,**  **2007, a date that is sooner than would otherwise be required through the traditional nonattainment**  **designation process.**

**At the end of 2002, 45 of South Carolina's 46 coun ties, SCDHEC, and USEPA Region 4 had signed**  **compacts to implement ozone reduction strategies ea rlier than federally required. Statewide stakehold**  **er groups involving local and federal governments, ind**  **ustry, environmental groups, and other interested parties have worked together to plan and implement**  **strategies for ozone pollution prevention throughou t**  **the state. Plans involve mobile source pollution r eduction, outreach actions, and point source preven**  **tion, which provide flexibility and foster "homegrown" so**  **lutions.**

**The most important reasons for moving forward in t his proactive manner are the public health**  **benefits realized by meeting the new standard soone r than required and also the deferral of the effect**  **ive date of a nonattainment designation.** 

**As part of this process, the EAC stakeholders deve loped statewide regulations aimed at achieving**  **additional reductions in ozone precursors. One new regulation that was developed as part of this proc**  **ess was South Carolina Air Pollution Control Regulation**  **R. 61-62.5, Standard 5.2,** Control of Oxides of Nitrogen (NOx) **. This is a broad-based regulation that applies st atewide to new and existing stationary** 

**sources that emit NOx from fuel combustion and have not undergone a best available control technology**  **(BACT) analysis for NOx. For new sources, the regu lation requires the installation of control technol**  **ogy that is based on BACT standards found in the RACT/B**  **ACT/LAER clearinghouse. For existing sources, the regulation only applies when an applicable unit**  **replaces their burner. At this point, they will b e**  **required to replace their burner with a low NOx bur ner or equivalent technology capable of achieving a** **7**

**30 percent reduction from uncontrolled levels.**

**Also, as part of the EAC process, South Carolina A ir Pollution Control Regulation R.**  **61-62.2,** Prohibition of Open Burning **, was revised by deleting the exception for the bur ning of household trash,**  **revising the exception for the burning of construct ion waste, and revising the exception for fires set**  **for the purpose of firefighter training. The burning o**  **f household trash presents health and environmental concerns for many communities. The smoke generated**  **from these activities is a nuisance to some and a health threat to others with asthma or other respir**  **atory problems. With respect to the exception for the**  **burning of construction waste, the regulation was r evised to allow only residential construction waste**  **to be burned outside the ozone season, and this will o**  **nly be allowed if it meets the provisions of the regulation. Finally, the exception for the purpose**  **of firefighter training was revised to ensure that minimum health, environmental, and safety concerns**  **are addressed.**

**These regulations were approved by the SCDHEC Boar d in January 2004, and, in accordance with**  **South Carolina law, they were subsequently submitte d to the Legislature for approval. The South**  **Carolina General Assembly approved the regulations, and the rules were published and became effective**  **upon publication in the State Register on June 25, 2004.** 

**In accordance with the EAC process, SCDHEC incorpo rated the statewide regulations and the local**  **early action plans into the agency's Early Action S IP revision and submitted it to the USEPA in Decemb**  **er 2004, for review and approval.** 

C. Take a Break from the Exhaust

**Take a break from the exhaust (TABFTE) is an alter native commute initiative that uses a competitive**  **model in which points are assigned/ awarded for eac h action that is done to minimize air pollution. A**  **computer program is used by participants to report their actions and to record their daily points. Th**  **e web based program is available to state and local gover**  **nment, industry, and the public. The program track s**  **and calculates vehicle miles, determines emission r eductions, is free and requires no additional**  **equipment.**

**TABFTE was started by the SCDHEC Bureau of Air Qua lity in 2001 and used by the bureau staff.**  **In 2003, it was awarded the Governor's Pollution Pr evention Award and became internet accessible. The**  **program was expanded to other state agencies in 200 4.** 

**The primary benefits of TABFTE are reduced emissio ns from mobile sources, increased awareness**  **of the impact of mobile sources on air quality, and it encourages participants to take voluntary actio**  **ns to help improve air quality.** 

D. Overall RACM Conclusions

**A number of emissions controls programs have been implemented in South Carolina since the Clean**  **Air Act Amendments of 1990, and substantial further emissions reductions will occur in the State as we**  **ll**

**as the Metrolina area in 2007. SCDHEC intends to c ontinue to investigate and, where appropriate, adop**  **t**
**additional measures that would reduce emissions of ozone precursors even further. Such measures may**  **help the State in the future, as it moves towards a ttainment of the eight-hour ozone NAAQS. The sourc**  **e categories emitting the vast preponderance of ozone**  **precursor emissions in the State are already subje ct**  **to control requirements. South Carolina has adopte d all of the above RACM and have since determined**  **that there are no additional technologically and ec onomically feasible control measures that would res**  **ult in South Carolina attaining the one-hour ozone NAAQ**  **S earlier than 2007.**ATTACHMENTS - APPENDIX M2