97-33958. Clean Air Act Approval and Promulgation of PMINF10/INF Implementation Plan for Colorado; Designation of Areas for Air Quality Planning Purposes; Steamboat Springs  

  • [Federal Register Volume 62, Number 250 (Wednesday, December 31, 1997)]
    [Rules and Regulations]
    [Pages 68188-68196]
    From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
    [FR Doc No: 97-33958]
    
    
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    ENVIRONMENTAL PROTECTION AGENCY
    
    40 CFR Parts 52 and 81
    
    [CO-001-0006a & CO-001-0021a; FRL-5934-2]
    
    
    Clean Air Act Approval and Promulgation of PM10 
    Implementation Plan for Colorado; Designation of Areas for Air Quality 
    Planning Purposes; Steamboat Springs
    
    AGENCY: Environmental Protection Agency (EPA).
    
    ACTION: Direct final rule.
    
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    SUMMARY: EPA approves the State implementation plan (SIP) submitted by 
    the State of Colorado to achieve attainment and maintenance of the 
    National Ambient Air Quality Standards (NAAQS) for particulate matter 
    with an aerodynamic diameter less than or equal to a nominal 10 
    micrometers (PM10), including among other things, control 
    measures, technical analyses, quantitative milestones and contingency 
    measures. The SIP was submitted by the Governor of Colorado with a 
    letter dated September 16, 1997 to satisfy certain Federal requirements 
    for an approvable SIP for the Steamboat Springs, Colorado moderate 
    PM10 nonattainment area, as designated effective January 20, 
    1994. In addition, EPA approves the Steamboat Springs emergency episode 
    plan. EPA also amends the boundary for the Steamboat Springs 
    nonattainment area to clarify the original description.
    
    DATES: This action is effective on March 2, 1998 unless adverse 
    comments are received by January 30, 1998. If the effective date is 
    delayed, timely notice will be published in the Federal Register.
    
    ADDRESSES: Comments should be addressed to: Richard R. Long, Director, 
    Air Program, EPA Region VIII at the address listed below. Copies of the 
    State's submittal and other information are available for inspection 
    during normal business hours at the following locations: Air Program, 
    Environmental Protection Agency, Region VIII, 999 18th Street, suite 
    500, Denver, Colorado 80202-2405; and Colorado Department of Public 
    Health and Environment, Air Pollution Control Division, 4300 Cherry 
    Creek Drive South, Denver, Colorado 80222-1530.
    
    FOR FURTHER INFORMATION CONTACT: Amy Platt, 8P2-A, Environmental 
    Protection Agency, Region VIII, 999 18th Street, suite 500, Denver, 
    Colorado 80202-2466, (303) 312-6449.
    
    SUPPLEMENTARY INFORMATION:
    
    I. Background
    
        The Steamboat Springs, Colorado area was designated nonattainment 
    for PM10 and classified as moderate under section 107(d)(3) 
    of the Clean Air Act, on December 21, 1993. 1 See 57 FR 
    43846 (September 22, 1992), 58 FR 67334 (December 21, 1993) and 40 CFR 
    81.306 (Routt County (part)). The Steamboat Springs designation became 
    effective on January 20, 1994. The air quality planning requirements 
    for moderate PM10 nonattainment areas 2 are set 
    out in Subparts 1 and 4 of Title I of the Act.3
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        \1\ The 1990 Amendments to the Clean Air Act made significant 
    changes to the Act. See Pub. L. 101-549, 104 Stat. 2399. References 
    herein are to the Clean Air Act, as amended (``the Act''). The Clean 
    Air Act is codified, as amended, in the U.S. Code at 42 U.S.C. 7401, 
    et seq.
        \2\ The requirements which are the subject of this document 
    arise under the pre-existing PM NAAQS. EPA promulgated a new PM 
    NAAQS on July 18, 1997, which became effective on September 16, 
    1997.
        \3\ Subpart 1 contains provisions applicable to nonattainment 
    areas generally and Subpart 4 contains provisions specifically 
    applicable to PM10 nonattainment areas. At times, Subpart 
    1 and Subpart 4 overlap or conflict. EPA has attempted to clarify 
    the relationship among these provisions in the ``General Preamble'' 
    and, as appropriate, in today's notice and supporting information.
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        EPA has issued a ``General Preamble'' describing EPA's preliminary 
    views on how EPA intends to review SIPs and SIP revisions submitted 
    under Title I of the Act, including those State submittals containing 
    moderate PM10 nonattainment area SIP requirements (see 
    generally 57 FR 13498 (April 16, 1992) and 57 FR 18070 (April 28, 
    1992)). Because EPA is describing its interpretations here only in 
    broad terms, the reader should refer to the General Preamble for a more 
    detailed discussion of the interpretations of title I advanced in this 
    document and the supporting rationale. In this document and supporting 
    rationale, EPA is applying its interpretations considering the specific 
    factual issues presented.
        A State containing a moderate PM10 nonattainment area 
    designated after the 1990 Amendments is required to submit, among other 
    things, the following provisions within 18 months of the effective date 
    of the designation (i.e., these provisions were due for the Steamboat 
    Springs area by July 20, 1995):
        1. Provisions to assure that reasonably available control measures 
    (RACM) (including such reductions in emissions
    
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    from existing sources in the area as may be obtained through the 
    adoption, at a minimum, of reasonably available control technology 
    (RACT)) shall be implemented no later than four years after designation 
    (i.e., January 20, 1998 for Steamboat Springs);
        2. Either a demonstration (including air quality modelling) that 
    the plan will provide for attainment as expeditiously as practicable 
    but no later than the end of the sixth calendar year after the 
    effective date of designation (i.e., December 31, 1999 for Steamboat 
    Springs), or a demonstration that attainment by that date is 
    impracticable;
        3. Quantitative milestones which demonstrate reasonable further 
    progress (RFP) toward the attainment date (i.e., December 31, 1999 for 
    Steamboat Springs). Since the SIP for a new nonattainment area is due 
    18 months after the area is designated as nonattainment, the first 3-
    year milestone is to be achieved 4 \1/2\ years after nonattainment 
    designation (i.e., July 20, 1998 for Steamboat Springs) and the second 
    milestone must be achieved three years after the first milestone or 7 
    \1/2\ years after nonattainment designation (i.e., July 20, 2001 for 
    Steamboat Springs);
        4. Provisions to assure that the control requirements applicable to 
    major stationary sources of PM10 also apply to major 
    stationary sources of PM10 precursors except where the 
    Administrator determines that such sources do not contribute 
    significantly to PM10 levels which exceed the NAAQS in the 
    area. See sections 172(c), 188, and 189 of the Act; and
        5. Contingency measures which consist of other available measures 
    that are not part of the area's control strategy. These measures must 
    take effect without further action by the State or EPA, upon EPA's 
    determination that the area has failed to make RFP or attain the 
    PM10 NAAQS by the applicable deadline. See section 172(c)(9) 
    of the Act.
    
    II. This Action
    
        Section 110(k) of the Act sets out provisions governing EPA's 
    review of SIP submittals (see 57 FR 13565-13566). The Governor of 
    Colorado submitted the Steamboat Springs PM10 SIP with a 
    letter dated September 16, 1997. The Steamboat Springs moderate 
    nonattainment area plan includes, among other things, technical 
    analyses, control measures to satisfy the RACM requirement, a 
    demonstration (including air quality modelling) that attainment and 
    maintenance of the PM10 NAAQS will be achieved by the 
    required dates, and enforceability documentation. In this final 
    rulemaking, EPA announces its approval of those elements of the 
    Steamboat Springs PM10 SIP which were due on July 20, 1995 
    and submitted on September 16, 1997.
        In addition, EPA has determined that major sources of precursors of 
    PM10 do not contribute significantly to PM10 
    levels in excess of the NAAQS in Steamboat Springs.4
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        \4\ The consequences of this finding are to exclude these 
    sources from the applicability of PM10 nonattainment area 
    control requirements. Note that EPA's finding is based on the 
    current character of the area including, for example, the existing 
    mix of sources in the area. It is possible, therefore, that future 
    growth could change the significance of precursors in the area.
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        Finally, EPA is amending the nonattainment area boundary 
    description for Steamboat Springs in order to clarify the original 
    description.
    
    A. Analysis of State Submission
    
    1. Procedural Background
        The Act requires States to observe certain procedural requirements 
    in developing implementation plans and plan revisions for submission to 
    EPA. Section 110(a)(2) of the Act provides that each implementation 
    plan submitted by a State must be adopted after reasonable notice and 
    public hearing. 5 Section 110(l) of the Act similarly 
    provides that each revision to an implementation plan submitted by a 
    State under the Act must be adopted by such State after reasonable 
    notice and public hearing.
        EPA also must determine whether a submittal is complete and 
    therefore warrants further EPA review and action (see section 110(k)(1) 
    and 57 FR 13565). EPA's completeness criteria for SIP submittals are 
    set out at 40 CFR part 51, appendix V. EPA attempts to make 
    completeness determinations within 60 days of receiving a submission. 
    However, a submittal is deemed complete by operation of law if a 
    completeness determination is not made by EPA six months after receipt 
    of the submission.
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        \5\ Also Section 172(c)(7) of the Act requires that plan 
    provisions for nonattainment areas meet the applicable provisions of 
    Section 110(a)(2).
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        To entertain public comment on the PM10 implementation 
    plan for Steamboat Springs, the Steamboat Springs City Council and the 
    Routt County Commission held public hearings on June 6, 1995 and June 
    12, 1995, respectively. The State of Colorado, after providing adequate 
    public notice, held a public hearing on September 21, 1995. After 
    considering all public comments and following the public hearing, the 
    Steamboat Springs PM10 SIP was adopted by the Colorado Air 
    Quality Control Commission (AQCC). The Steamboat Springs 
    PM10 SIP was submitted by the Governor in a letter dated 
    August 7, 1996. The Steamboat Springs PM10 SIP was reviewed 
    by EPA to determine completeness in accordance with the completeness 
    criteria set out at 40 CFR part 51, appendix V. The submittal was found 
    to be complete and a letter dated August 29, 1996 was forwarded to the 
    Governor indicating the completeness of the submittal and the next 
    steps in the review process.
        Subsequently, the Steamboat Springs City Council and the Routt 
    County Commission held public hearings on extensive revisions to the 
    Steamboat Springs PM10 SIP on September 17, 1996 and 
    approved the revisions. The Colorado AQCC conducted a public hearing on 
    the revised SIP on October 17, 1996 and adopted the revisions. In a 
    January 31, 1997 letter from Margie Perkins, Air Pollution Control 
    Division (APCD), to Richard Long, EPA, the State requested that EPA 
    Region VIII delay processing of the original Steamboat Springs SIP 
    submitted with the August 7, 1996 Governor's letter. The reason 
    provided for the request was that the substantial revisions adopted on 
    October 17, 1996 made the original SIP and regulations obsolete. These 
    revisions were submitted by the Governor with a letter dated September 
    16, 1997, and the State requested that this documentation completely 
    replace the August 7, 1996 submittal.
        The September 16, 1997 Steamboat Springs PM10 SIP 
    submittal was reviewed by EPA to determine completeness in accordance 
    with the completeness criteria set out at 40 CFR part 51, appendix V. 
    The submittal was found to be complete and an October 20, 1997 letter 
    was forwarded to the Governor indicating the completeness of the 
    submittal and the next steps in the review process.
        As requested by the State, this rulemaking action is specific to 
    the September 16, 1997 submittal.
    2. Accurate Emission Inventory
        Section 172(c)(3) of the Act requires that nonattainment plan 
    provisions include a comprehensive, accurate, current inventory of 
    actual emissions from all sources of relevant pollutants in the 
    nonattainment area. The emission inventory also should include a 
    comprehensive, accurate, and current inventory of allowable emissions 
    in the area. See, for example, section 110(a)(2)(K). Because the 
    submission of such inventories is a necessary adjunct to an area's 
    attainment demonstration (or demonstration that the area cannot 
    practicably attain), the emission
    
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    inventories must be received with the submission (see 57 FR 13539).
        The Colorado APCD chose 1991 as the Steamboat Springs base year 
    emissions inventory of PM10 emissions. The results indicate 
    that area sources contribute approximately 99% of the total emissions 
    for the area, of which re-entrained road dust (including paved and 
    unpaved roads) contributes approximately 94% and woodburning 
    contributes approximately 5%. Stationary sources accounted for less 
    than 1% of the emission inventory. 6
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        \6\ Although emissions from the Craig and Hayden power stations 
    were not included in the inventory because these sources are outside 
    the inventory domain, the emissions were included in the modelling 
    analyses for the SIP to determine impacts on the nonattainment area.
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        EPA is approving the emission inventory because it is accurate and 
    comprehensive, and provides a sufficient basis for determining the 
    adequacy of the attainment demonstration for this area consistent with 
    the requirements of sections 172(c)(3) and 110(a)(2)(K) of the Act. 
    7 For further details see the Steamboat Springs 
    PM10 SIP Technical Support Document (TSD) for this action.
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        \7\ EPA issued guidance on PM-10 emissions inventories prior to 
    the enactment of the Clean Air Act Amendments in the form of the 
    1987 PM-10 SIP Development Guideline. The guidance provided in this 
    document appears to be consistent with the revised Act.
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        The September 16, 1997 submittal also establishes an emission 
    budget for the Steamboat Springs nonattainment area, which is to be 
    used for Federal conformity purposes. The PM10 mobile source 
    emission budget for 1999 is 16,661 pounds/day and for 2002 is 20,682 
    pounds/day for the modelling domain. These budgets are the 1999 and 
    2002 mobile source PM10 emissions presented in Section G. of 
    the SIP, which include emissions from vehicle exhaust, brake, and tire 
    wear, controlled emissions from paved roads, and unpaved road 
    emissions. These budgets are calculated for the emission inventory/
    modelling domain, which is somewhat larger than the nonattainment area.
    3. RACM (Including RACT)
        As noted, the moderate PM10 nonattainment areas, 
    designated after the 1990 Amendments, must submit provisions to assure 
    that RACM (including RACT) are implemented no later than January 20, 
    1998 (see sections 172(c)(1) and 189(a)(1)(C)). The General Preamble 
    contains a detailed discussion of EPA's interpretation of the RACM 
    (including RACT) requirement (see 57 FR 13539-13545 and 13560-13561).
        In broad terms, the State should identify available control 
    measures and evaluate them for their reasonableness in light of the 
    feasibility of the controls and the attainment needs of the area. See 
    57 FR 13540-13544. A State may reject an available control measure if 
    the measure is technologically infeasible or the cost of the control is 
    unreasonable. In addition, RACM does not require controls on emissions 
    from sources that are insignificant (i.e., de minimis) and does not 
    require the implementation of all available control measures where an 
    area demonstrates timely attainment and the implementation of 
    additional controls would not expedite attainment.
        Colorado's SIP revision for Steamboat Springs contains control 
    measures for sources of re-entrained fugitive dust (including paved and 
    unpaved roads) and woodburning (including fireplaces and woodstoves). 
    In the following table, an outline is presented on these sources, their 
    control measures, associated emissions reduction credit, and effective 
    dates.
    
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                                                                                                          Effective 
              Source category                      Control measure             PM10 emissions reduction      date   
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                                        Colorado Air Quality Control          .........................     12/30/96
                                         Commission State Implementation                                            
                                         Plan-Specific Regulations for                                              
                                         Nonattainment Areas, Steamboat                                             
                                         Springs PM10 Nonattainment Area.                                           
    Re-entrained fugitive dust........  Sections VIII.B, C. & D. Require      720 kg/day or                         
                                         compliance with specifications for    approximately 1588 lbs/              
                                         street sanding materials, reduction   day fewer PM10 emissions             
                                         in the amount of street sand          than base year.                      
                                         applied, and street sweeping.                                              
    Woodburning.......................  Section VIII.E.--Requires continued   Existing local programs               
                                         implementation of local programs to   were given emission                  
                                         restrict the number and type of new   reduction credits in the             
                                         solid fuel burning devices in the     base and attainment year             
                                         nonattainment area.                   emissions inventories.               
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        RACM does not require additional controls on other area sources 
    since the plan demonstrates attainment of the NAAQS and implementation 
    of additional controls would not further expedite attainment. Further, 
    RACT does not require additional controls for the stationary sources in 
    the Steamboat Springs nonattainment area because point source emissions 
    in the area are de minimis and control of such sources would not 
    expedite attainment of the PM10 NAAQS.
        There are also other Statewide control measures that already apply 
    in the Steamboat Springs area, which will help curb PM10 
    emissions in the Steamboat Springs nonattainment area. Specifically, 
    Colorado Regulation No. 4 requires new wood stoves to meet the emission 
    requirements of EPA's Standards of Performance for New Residential Wood 
    Heaters in 40 CFR 60.532(b), and Colorado Regulation No. 3 regulates 
    the construction and modification of stationary sources of 
    PM10. These measures will help to
    
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    reduce emissions from new stationary source growth and residential wood 
    combustion. However, EPA is not acting on Regulation Nos. 3 and 4 at 
    this time because EPA has previously approved these regulations. For 
    further information, see the TSD accompanying this document.
        A more detailed discussion of the source category contributions, 
    associated control measures (including available control technology), 
    and an explanation of why certain available control measures were not 
    implemented can be found in the TSD. EPA has reviewed the State's 
    documentation and concluded that it adequately justifies the control 
    measures to be implemented. The implementation of Colorado's 
    PM10 nonattainment plan for Steamboat Springs will result in 
    the attainment of the PM10 NAAQS by December 31, 1999, and 
    maintenance of the PM10 NAAQS through 2002. EPA is approving 
    the Steamboat Springs PM10 plan's control strategy as 
    satisfying the RACM (including RACT) requirement.
    4. Demonstration
        As noted, moderate PM10 nonattainment areas designated 
    subsequent to enactment of the 1990 Amendments must submit a 
    demonstration (including air quality modelling) showing that the plan 
    will provide for attainment as expeditiously as practicable, but no 
    later than the end of the sixth calendar year after an area's 
    designation to attainment (see section 188(c)(1) of the Act). In the 
    case of Steamboat Springs, this attainment deadline is December 31, 
    1999, or the State must show that attainment by December 31, 1999, is 
    impracticable.
        The attainment demonstration presented in the September 16, 1997 
    submittal indicated that the PM10 NAAQS will be attained by 
    1999 in the Steamboat Springs area. The 24-hour PM10 NAAQS 
    is 150 micrograms/cubic meter (g/m3), and the 
    standard is attained when the expected number of days per calendar year 
    with a 24-hour average concentration above 150 g/m3 
    is equal to or less than one (see 40 CFR 50.6). The annual 
    PM10 NAAQS is 50 g/m3, and the standard 
    is attained when the expected annual arithmetic mean concentration is 
    less than or equal to 50 g/m3 (id.).
        EPA regulations provide that attainment be demonstrated by means of 
    a proportional model or dispersion model or other procedure shown to be 
    adequate and appropriate for such purposes. See 40 CFR 51.112(a). In 
    general, EPA policy provides that the preferred approach for estimating 
    the air quality impacts of emissions of PM10 is to use 
    receptor modelling in combination with dispersion modelling.
        The State utilized the monitoring and emissions data and control 
    measure efficiencies presented in the Steamboat Springs PM10 
    SIP as inputs in a dispersion modelling-based attainment demonstration. 
    The dispersion model was used to predict concentrations of 
    PM10 for the Steamboat Springs nonattainment area. The model 
    was first calibrated to accurately predict worst-case PM10 
    levels for 1991, for which monitoring data is available. Based upon 
    these accurate predictions for 1991, the State is confident that the 
    model's predictive capabilities are very good, and also confident that 
    the modelling results generated for the attainment year of 1999 are 
    reliable.
        The dispersion modelling for Steamboat Springs, submitted with the 
    SIP on September 16, 1997, demonstrates attainment of the 24-hour 
    PM10 NAAQS by December 31, 1999 since the highest modelled 
    concentration for that year is 115 g/m3 at the 
    downtown Steamboat Springs receptor. Because no exceedances of the 
    PM10 annual NAAQS have been recorded in the Steamboat 
    Springs area and because the attainment demonstration submitted with 
    the Steamboat Springs SIP shows attainment of the 24-hour 
    PM10 NAAQS, EPA believes it is reasonable and adequate to 
    assume that protection of the 24-hour standard will be sufficient to 
    protect the annual standard as well. The dispersion modelling also 
    demonstrates maintenance of the 24-hour PM10 NAAQS by 
    December 31, 2002, since the highest modelled concentration for that 
    year is 123 g/m3. The control strategies relied on 
    to demonstrate timely attainment and maintenance are summarized in the 
    section above entitled ``RACM (including RACT).'' For a more detailed 
    description of the attainment and maintenance demonstrations and the 
    control strategies used, see the TSD accompanying this document.
    5. PM10 Precursors
        The control requirements that are applicable to major stationary 
    sources of PM10 also apply to major stationary sources of 
    PM10 precursors, unless EPA determines such sources do not 
    contribute significantly to PM10 levels which exceed the 
    NAAQS in that area (see section 189(e) of the Act). The General 
    Preamble contains guidance addressing how EPA intends to implement 
    section 189(e) (57 FR 13539-13542). An analysis of air quality and 
    emissions data for the Steamboat Springs nonattainment area indicates 
    that exceedances of the NAAQS are attributable chiefly to direct 
    particulate emissions from re-entrained road dust and residential wood 
    burning (i.e., area sources). The emissions inventory for Steamboat 
    Springs did not reveal any major stationary sources of PM10 
    precursors within the inventory domain. The chemical mass balance 
    analysis of filters from high concentration days revealed insignificant 
    source apportionments to secondaries (approximately 1% to ammonium 
    nitrates and approximately 2% to ammonium sulfates). The dispersion 
    modelling for the SIP included a screening of major PM10 
    stationary sources outside of the nonattainment area, including the 
    Hayden and Craig power plants, to determine impacts to the 
    nonattainment area. These analyses revealed insignificant source 
    apportionments in the nonattainment area to the Hayden and Craig power 
    plants, which is logical given the distances that these plants are from 
    the nonattainment area. Craig is approximately 37 miles from downtown 
    Steamboat Springs and Hayden is approximately 18.5 miles from downtown 
    Steamboat Springs.
        Based upon the emissions inventory, chemical mass balance analyses, 
    and dispersion modelling, EPA believes that the overall contribution of 
    PM10 precursors is insignificant. Therefore, EPA is making 
    the determination that major sources of PM10 precursors do 
    not contribute significantly to PM10 levels in excess of the 
    NAAQS in Steamboat Springs. The consequence of this finding is to 
    exclude any such sources from the applicability of PM10 
    nonattainment area control requirements. Note that EPA's finding is 
    based on the current character of the area including, for example, the 
    existing mix of sources in the area. It is possible, therefore, that 
    future growth could change the significance of precursors in the area. 
    Further discussion of the analyses and supporting rationale for EPA's 
    finding are contained in the TSD accompanying this document.
    6. New Source Review
        On August 18, 1994 (59 FR 42500-42506), EPA approved the State's 
    nonattainment new source review (NSR) permitting regulations for 
    sources of PM10 in the State's PM10 nonattainment 
    areas. In that notice, EPA stated that, because the Steamboat Springs 
    PM10 nonattainment area SIP was not due to be submitted 
    until July 20, 1995, EPA would determine the approvability of the 
    State's NSR provisions for that nonattainment area when EPA took action 
    on the State's SIP submittal for
    
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    Steamboat Springs. Since the State's NSR regulations meet all of the 
    Federal requirements for new and modified major stationary sources of 
    PM10 locating in moderate PM10 nonattainment 
    areas (as discussed in the August 18, 1994 Federal Register), EPA finds 
    that the State has met the nonattainment NSR permitting requirements 
    for sources of PM10 locating in the Steamboat moderate 
    PM10 nonattainment area. In addition, as discussed in 
    Section 5. above, EPA finds that major stationary sources of 
    PM10 precursors do not contribute significantly to 
    PM10 levels in excess of the NAAQS in Steamboat Springs. The 
    consequence of this finding is to exclude major stationary sources of 
    PM10 precursors in Steamboat Springs from the applicability 
    of PM10 nonattainment area control requirements, including 
    nonattainment NSR permitting requirements. Thus, the State's 
    nonattainment NSR regulations for Steamboat Springs are considered 
    fully approvable.
    7. Quantitative Milestones and Reasonable Further Progress
        The PM10 nonattainment area plans demonstrating 
    attainment must contain quantitative emission reduction milestones 
    which are to be achieved every three years until the area is 
    redesignated attainment and which demonstrate reasonable further 
    progress (RFP), as defined in section 171(1), toward timely attainment. 
    While section 189(c) plainly provides that quantitative milestones are 
    to be achieved until an area is redesignated attainment, it is silent 
    in indicating the starting point for counting the first three-year 
    period or how many milestones must be initially addressed. In the 
    General Preamble, EPA addressed the statutory gap in the starting point 
    for counting the three-year milestones, indicating that it would begin 
    from the due date for the applicable implementation plan revision 
    containing the control measures for the area (i.e., November 15, 1991 
    for initial moderate PM10 nonattainment areas). See 57 FR 
    13539. As to the number of milestones, EPA believes that at least two 
    milestones must be initially addressed.
        States containing moderate nonattainment areas designated 
    subsequent to enactment of the 1990 Amendments are expected to 
    initially submit two milestones. States are required to submit SIP's 
    for these areas 18 months after their redesignation as nonattainment. 
    The attainment date for new PM10 nonattainment areas is ``as 
    expeditiously as practicable'' but no later than the end of the sixth 
    calendar year after an area's designation as nonattainment. Therefore, 
    the attainment date for Steamboat Springs is December 31, 1999.
        Because the SIP revision, including the quantitative milestones 
    element, for a new nonattainment area is due 18 months after the area 
    is designated as nonattainment, the first 3-year milestone is to be 
    achieved 4\1/2\ years after the nonattainment redesignation. Since 
    Steamboat Springs redesignation became effective on January 20, 1994, 
    the first 3-year milestone must be achieved by July 20, 1998 (i.e., 
    1\1/2\ years prior to the attainment deadline). The second quantitative 
    milestone must be achieved three years after the first milestone or 
    7\1/2\ years after the nonattainment designation. In Steamboat Springs, 
    the second quantitative milestone must be achieved by July 20, 2001 
    (i.e., 1\1/2\ years after the attainment deadline if the maximum of six 
    years is needed to attain the PM10 NAAQS). The second 
    quantitative milestone should provide for continued emission reduction 
    progress toward attainment and should provide for continued maintenance 
    of the NAAQS after the attainment date for the area.8
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        \8\ Section 189(c) provides that quantitative milestones are to 
    be achieved ``until the area is redesignated attainment.'' However, 
    this endpoint for quantitative milestones is speculative because 
    redesignation of an area as attainment is contingent upon several 
    factors and future events. Therefore, EPA believes it is reasonable 
    for States to initially address the first two milestones. Addressing 
    two milestones will ensure that the State continues to maintain the 
    NAAQS beyond the attainment date for at least some period during 
    which an area could be redesignated attainment. Requiring that 
    additional milestones be addressed, at least initially, would place 
    a potentially unnecessary planning burden on States containing areas 
    that are redesignated attainment. However, in all instances, 
    additional milestones must be addressed if an area is not 
    redesignated attainment.
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        Because all of the Steamboat Springs emission control measures will 
    go into effect in 1996, and because measures have been developed to 
    keep the area in attainment through 2002, the State believes, and EPA 
    agrees, that the quantitative milestone requirements for emission 
    reductions will be achieved.
    8. Enforceability Issues
        All measures and other elements in the SIP must be enforceable by 
    the State and EPA (see sections 172(c)(6), 110(a)(2)(A) and 57 FR 
    13556). The EPA criteria addressing the enforceability of SIPs and SIP 
    revisions were stated in a September 23, 1987 memorandum (with 
    attachments) from J. Craig Potter, Assistant Administrator for Air and 
    Radiation, et al. (see 57 FR 13541). Nonattainment area plan provisions 
    also must contain a program to provide for enforcement of control 
    measures and other elements in the SIP (see section 110(a)(2)(C)).
        The specific control measures contained in the SIP are addressed 
    above in Section II.A.3., ``RACM (including RACT).'' The Colorado Air 
    Quality Control Commission State Implementation Plan-Specific 
    Regulation for Nonattainment Areas, Section VIII. Steamboat Springs 
    PM10 Nonattainment Area, became effective on December 30, 
    1996. This regulation requires the City of Steamboat Springs to 
    continue implementation and enforcement of Ordinance No. 1191 (1991), 
    Ordinance No. 1148 (1990), Ordinance No. 1045 (1988), and Ordinance No. 
    977 (1987). The State regulation also requires Routt County to continue 
    implementation and enforcement of Resolution No. 91-032 (1991). The 
    ordinance and resolutions will limit future growth in emissions from 
    solid fuel burning devices. The State regulation also includes record 
    keeping requirements. The City of Steamboat Springs and Routt County 
    must each submit to the APCD by May 31st of each year a report that 
    describes the tracking and enforcement of these local control 
    strategies. The report must include information on compliance and 
    enforcement activities that have occurred during the previous year so 
    that the APCD can verify that the ordinances and resolution have been 
    properly implemented.
        The Colorado Air Quality Control Commission State Implementation 
    Plan-Specific Regulation for Nonattainment Areas, Section VIII., 
    Steamboat Springs PM10 Nonattainment Area, also details 
    specifications for street sanding materials, requirements for the 
    reduction in the amount of street sand applied, and street sweeping 
    requirements for Lincoln Avenue. These requirements will limit re-
    entrained road dust emissions in the area. To limit woodburning 
    emissions in the area, the State regulation also requires continued 
    implementation of local programs to restrict the number and type of new 
    solid fuel burning devices in the nonattainment area. Annual 
    recordkeeping and reporting requirements are detailed for each control 
    strategy, as follows.
        Beginning November 1, 1996, each user of street sanding materials 
    must submit a report to the APCD which provides a copy of all 
    independent tests performed on sanding materials. The report must also 
    include the name and address of all suppliers of street sanding 
    material along with a description of the location of the supplier's 
    aggregate pit
    
    [[Page 68193]]
    
    from which all material was supplied. Files must be maintained for two 
    years.
        No later than May 31 of each year, beginning in 1997, the Colorado 
    Department of Transportation must submit a report to the APCD which 
    demonstrates compliance with the provisions for the reduction of street 
    sand applied for the previous sanding season. Files must be maintained 
    for two years.
        No later than February 28 and May 31 of each year, beginning in 
    1997, the City of Steamboat Springs must submit a report to the APCD 
    which demonstrates compliance with the street sweeping requirements for 
    Lincoln Avenue. The reports must contain information for the period 
    December 1--January 31 and February 1--March 31, respectively, as 
    follows: (1) Date of sweeping operation; (2) specific segments of 
    Lincoln Avenue swept; (3) type of equipment used; (4) equipment 
    malfunctions and downtime, if any; (5) conditions of traffic lanes 
    (dry, wet, snow packed, patchy ice, etc.); and (6) general weather 
    conditions at time of sweeping operations. Files must be maintained for 
    two years.
        No later than May 31 of each year, beginning in 1997, the City of 
    Steamboat Springs and Routt County must submit to the APCD a report 
    containing information that describes the tracking and enforcement of 
    the local woodburning ordinances and resolution. The annual report must 
    include information on compliance and enforcement activities that have 
    occurred during the previous year.
        EPA has reviewed the Colorado Air Quality Control Commission State 
    Implementation Plan-Specific Regulations for Nonattainment Areas, 
    Section VIII., Steamboat Springs PM10 Nonattainment Area, 
    for enforceability and has determined that it meets all of the criteria 
    included in the September 23, 1987 Potter Memorandum.
        As discussed in Section II.A.3. above, there are also State-wide 
    regulations that will impact the emissions of PM10 in the 
    Steamboat Springs nonattainment area. These regulations include 
    Colorado Regulation No. 4, which requires all wood stoves sold after 
    July 1, 1991 to meet the emission requirements of EPA's Standards of 
    Performance for New Residential Wood Heaters in 40 CFR 60.532(b), and 
    Colorado Regulation No. 3, which requires construction permits for new 
    or modified stationary sources. EPA previously reviewed these 
    regulations, and determined that they met the enforceability criteria 
    of the September 23, 1987 Potter Memorandum and approved them as part 
    of the SIP (see the TSD for information on EPA approvals of these 
    regulations).
        The State of Colorado has a program that will ensure that the 
    measures contained in the SIP are adequately enforced. The Colorado 
    APCD has the authority to implement and enforce all emission 
    limitations and control measures adopted by the AQCC. In addition, 
    Colorado statute provides that the APCD shall enforce against any 
    ``person'' who violates the emission control regulations of the AQCC, 
    the requirements of the SIP, or the requirements of any permit. The 
    definition of ``person'' includes any ``municipal corporation, county, 
    city and county or other political subdivision of the State,'' such as 
    the City of Steamboat Springs and Routt County. Civil penalties of up 
    to $15,000 per day per violation are provided for in the State statute 
    for any person in violation of these requirements, and criminal 
    penalties are also provided for in the State statute.
        Thus, EPA has determined that the control measures contained in the 
    SIP revision for Steamboat Springs are enforceable and that the APCD 
    has adequate enforcement capabilities to ensure compliance with those 
    control measures and the State regulations. The TSD contains further 
    information on the State-wide regulations, enforceability requirements, 
    and a discussion of the personnel and funding intended to support 
    effective implementation of the control measures.
    9. Contingency Measures
        As provided in section 172(c)(9) of the Act, all moderate 
    nonattainment area SIPs that demonstrate attainment must include 
    contingency measures. See generally 57 FR 13510-13512 and 13543-13544. 
    Contingency measures should consist of other available measures that 
    are not part of the area's control strategy. These measures must take 
    effect without further action by the State or EPA, upon EPA's 
    determination that the area has failed to make RFP or attain the 
    PM10 NAAQS by the applicable statutory deadline.
        The Governor of Colorado submitted PM10 contingency 
    measures for the Steamboat Springs area with a September 16, 1997 
    letter. These measures, as discussed below, require additional street 
    sweeping for Lincoln Avenue and the downtown core area within two 
    months following EPA's determination that the Steamboat Springs 
    moderate PM10 nonattainment area failed to attain the 
    PM10 NAAQS or make reasonable further progress (RFP) in 
    reducing emissions.
        The City of Steamboat Springs will expand the sweeping program to 
    include the traffic lanes of Lincoln Avenue from 13th Street west for 
    one mile, and Lincoln Avenue from Old Fish Creek Falls Road to Pine 
    Grove Road. These roadways must be swept within four days of the 
    roadways becoming free and clear of snow and ice following each sanding 
    deployment, as weather and street conditions permit. In addition, the 
    traffic lanes of all streets within the downtown core area of Steamboat 
    Springs, as bounded by 3rd Street, 12th Street, Yampa, and Oak. These 
    roadways must be swept within four days of the roadways becoming free 
    and clear of snow and ice following each sanding deployment, as weather 
    and street conditions permit.
        The State believes, and EPA agrees, that these contingency measures 
    are adequate since the control measures implemented in the 
    PM10 SIP provide a safety margin by achieving more emissions 
    reductions than needed to demonstrate attainment of the PM10 
    NAAQS, as indicated by the State's predicted 24-hour attainment 
    concentration of 115 g/m\3\. For a detailed discussion of 
    these contingency measures, see the TSD accompanying this document.
    10. Emergency Episode Plan
        EPA believes the Steamboat Springs emergency episode plan, as 
    included in the September 16, 1997 submittal, is adequate. The plan 
    describes the actions to be taken when conditions exist that have 
    historically resulted in exceedances of the 24-hour PM10 
    standard. Voluntary and mandatory activities include suspension of open 
    burning, curtailment of wood/coal burning, and reduction of non-
    essential motor vehicle operations. For details on the emergency 
    episode plan, please see the TSD.
    11. Revisions to the Nonattainment Area Boundary
        The Steamboat Springs nonattainment area boundary as codified in 
    the Federal Register notice published on December 21, 1993 (see 58 FR 
    67334) is currently defined as the Steamboat Springs area airshed. See 
    40 CFR 81.306. This boundary description was intended to be responsive 
    to comments received from the State of Colorado on EPA's September 22, 
    1992 proposed rulemaking to redesignate the area to nonattainment (see 
    57 FR 43846). In those comments, the State indicated that on June 20, 
    1991 the AQCC adopted a map which outlined the Steamboat Springs 
    PM10 nonattainment area. The map identified the 
    nonattainment area
    
    [[Page 68194]]
    
    as a portion of Routt County which included the City of Steamboat 
    Springs, as well as certain surrounding areas in Routt County. With its 
    PM10 SIP submittal dated August 12, 1996, the State provided 
    a clearer description of the boundary by providing a legal description 
    of the map outline. The following legal description of the 
    nonattainment area represents the map outline adopted by the AQCC and 
    used by APCD for SIP purposes:
        On the East--The Routt National Forest.
        On the South--The southern border of sections 19, 10, 21, T4N, R84W 
    of the 6th P.M. and the southern border of sections 23, 24, T4N, R85W 
    of the 6th P.M.
        On the West--Beginning at the south western corner of section 23, 
    T4N, R85W of the 6th P.M. North along the western border of sections 
    23, 14, 11, T4N, R85W. Thence, along the ridge which bisects sections 
    35, 36, 25, 24, 13, 14, 11, 12, 1, T5N, R85W, and sections 36, 25, 24, 
    T6N, R85W. Thence heading northwest along the ridge which bisects 
    sections 23, 15, 10, 9,4, T6N, R85W of 6th P.M. Thence, heading 
    northeast along the ridge which bisects sections 33, 34, 35, 36, 25, 
    T7N, R85W and sections 30 and 10 of T7N, R84W. Thence, north along the 
    N 1/2 of the western edge of section 19, to the NW corner of section 
    18, T7N, R84W.
        On the North--The northern boundary of sections 16, 17, 18, T7N, 
    R84W of 6th P.M.
        The boundary was determined to be the reasonable Steamboat Springs 
    air shed by considering factors such as local topography, meteorology, 
    emissions sources, land use practices, and tourism. EPA is replacing 
    the boundary description currently in 40 CFR 81.306 with this revised 
    description to more clearly define the nonattainment area.
    
    B. Update to Code of Federal Regulations
    
        EPA is also updating 40 CFR 52.332, Moderate PM10 
    nonattainment area plans, to reflect the approved status of the 
    Telluride moderate PM10 nonattainment area plan. EPA 
    approved that SIP on October 4, 1996 (61 FR 51784), but neglected to 
    update 40 CFR 52.332 at that time.
    
    III. Final Action
    
        EPA is approving the elements of the PM10 SIP for the 
    Steamboat Springs, Colorado nonattainment area that were due on July 
    20, 1995 and submitted to EPA by the Colorado Governor with a letter 
    dated September 16, 1997, including among other things, control 
    measures, technical analyses, quantitative milestones and contingency 
    measures. Additionally, EPA is approving the Steamboat Springs 
    emergency episode plan. EPA is also amending the boundary description 
    for the Steamboat Springs nonattainment area to clarify the original 
    description.
        Note that per an October 29, 1997 letter from the State, EPA is not 
    acting on revisions to the Ambient Air Quality Standards for the State 
    of Colorado which were included in the September 16, 1997 SIP submittal 
    for informational purposes only.
        EPA is publishing this action without prior proposal because the 
    Agency views this as a noncontroversial amendment and anticipates no 
    adverse comments. However, in a separate document in this Federal 
    Register publication, EPA is proposing to approve the SIP revision 
    should adverse or critical comments be filed. This action will be 
    effective March 2, 1998 unless, by January 30, 1998 adverse or critical 
    comments are received.
        If EPA receives such comments, this action will be withdrawn before 
    the effective date by publishing a subsequent document that will 
    withdraw the final action. All public comments received will be 
    addressed in a subsequent final rule based on this action serving as a 
    proposed rule. EPA will not institute a second comment period on this 
    action. Any parties interested in commenting on this action should do 
    so at this time. If no such comments are received, the public is 
    advised that this action will be effective on March 2, 1998.
        Nothing in this action should be construed as permitting or 
    allowing or establishing a precedent for any future request for 
    revision to any SIP. Each request for revision to a SIP shall be 
    considered separately in light of specific technical, economic, and 
    environmental factors and in relation to relevant statutory and 
    regulatory requirements.
    
    IV. Administrative Requirements
    
    A. Executive Order 12866
    
        The Office of Management and Budget (OMB) has exempted this 
    regulatory action from E.O. 12866 review.
    
    B. Regulatory Flexibility Act
    
        Under the Regulatory Flexibility Act, 5 U.S.C. 600, et seq., EPA 
    must prepare a regulatory flexibility analysis assessing the impact of 
    any proposed or final rule on small entities. 5 U.S.C. 603 and 604. 
    Alternatively, EPA may certify that the rule will not have a 
    significant economic impact on a substantial number of small entities. 
    Small entities include small businesses, small not-for-profit 
    enterprises, and government entities with jurisdiction over populations 
    of less than 50,000.
        SIP approvals under section 110 and subchapter I, part D of the 
    Clean Air Act do not create any new requirements but simply approve 
    requirements that the State is already imposing. Therefore, because the 
    Federal SIP approval does not impose any new requirements, the 
    Administrator certifies that it does not have a significant impact on 
    any small entities affected. Moreover, due to the nature of the 
    Federal-State relationship under the CAA, preparation of a regulatory 
    flexibility analysis would constitute Federal inquiry into the economic 
    reasonableness of state action. The Clean Air Act forbids EPA to base 
    its actions concerning SIPs on such grounds. Union Electric Co. v. U.S. 
    E.P.A., 427 U.S. 246, 256-66 (1976); 42 U.S.C. 7410(a)(2).
    
    C. Unfunded Mandates
    
        Under Section 202 of the Unfunded Mandates Reform Act of 1995 
    (``Unfunded Mandates Act''), signed into law on March 22, 1995, EPA 
    must prepare a budgetary impact statement to accompany any proposed or 
    final rule that includes a Federal mandate that may result in estimated 
    costs to State, local, or tribal governments in the aggregate; or to 
    the private sector, of $100 million or more. Under Section 205, EPA 
    must select the most cost-effective and least burdensome alternative 
    that achieves the objectives of the rule and is consistent with 
    statutory requirements. Section 203 requires EPA to establish a plan 
    for informing and advising any small governments that may be 
    significantly or uniquely impacted by the rule.
        EPA has determined that the approval action promulgated does not 
    include a Federal mandate that may result in estimated costs of $100 
    million or more to either State, local, or tribal governments in the 
    aggregate, or to the private sector. This Federal action proposes to 
    approve pre-existing requirements under State or local law, and imposes 
    no new Federal requirements. Accordingly, no additional costs to State, 
    local, or tribal governments, or to the private sector, result from 
    this action.
    
    D. Submission to Congress and the General Accounting Office
    
        Under 5 U.S.C. 801(a)(1)(A) as added by the Small Business 
    Regulatory Enforcement Fairness Act of 1996, EPA submitted a report 
    containing this rule and other required information to the U.S. Senate, 
    the U.S. House of
    
    [[Page 68195]]
    
    Representatives and the Comptroller General of the General Accounting 
    Office prior to publication of this rule in today's Federal Register. 
    This rule is not a ``major rule'' as defined by 5 U.S.C. 804(2).
    
    E. Petitions for Judicial Review
    
        Under section 307(b)(1) of the Clean Air Act, petitions for 
    judicial review of this action must be filed in the United States Court 
    of Appeals for the appropriate circuit by March 2, 1998. Filing a 
    petition for reconsideration by the Administrator of this final rule 
    does not affect the finality of this rule for the purposes of judicial 
    review nor does it extend the time within which a petition for judicial 
    review may be filed, and shall not postpone the effectiveness of such 
    rule or action. This action may not be challenged later in proceedings 
    to enforce its requirements. (See section 307(b)(2).)
    
    List of Subjects
    
    40 CFR Part 52
    
        Environmental protection, Air pollution control, Hydrocarbons, 
    Incorporation by reference, Intergovernmental relations, Nitrogen 
    dioxide, Particulate matter, Reporting and recordkeeping requirements, 
    Sulfur dioxide, and Volatile organic compounds.
    
    40 CFR Part 81
    
        Air pollution control, National parks, Wilderness areas.
    
        Dated: November 4, 1997.
    Jack W. McGraw
    Acting Regional Administrator.
    
        40 CFR Parts 52 and 81 are amended as follows:
    
    PART 52--[AMENDED]
    
        1. The authority citation for part 52 continues to read as follows:
    
        Authority: 42 U.S.C. 7401 et seq.
    
        2. Section 52.320 is amended by adding paragraph (c)(76) to read as 
    follows:
    
    
    Sec. 52.320  Identification of plan.
    
    * * * * *
        (c) * * *
        (76) The Governor of Colorado submitted the moderate nonattainment 
    area PM10 State Implementation Plan (SIP) for Steamboat 
    Springs, Colorado with a letter dated September 16, 1997. The submittal 
    was made to satisfy those moderate PM10 nonattainment area 
    SIP requirements due for Steamboat Springs on July 20, 1995, including 
    among other things, control measures, technical analyses, quantitative 
    milestones, and contingency measures. The September 16, 1997 submittal 
    also included the Steamboat Springs emergency episode plan.
        (i) Incorporation by reference.
        (A) Colorado Air Quality Control Commission Nonattainment Areas, 5 
    CCR 1001-20, Section VIII., Steamboat Springs PM10 
    Nonattainment Area, adopted October 17, 1996 and effective on December 
    30, 1996.
        (ii) Additional material.
        (A) An October 29, 1997 letter from Margie M. Perkins, APCD, to 
    Richard R. Long, EPA, clarifying that the regulation entitled ``Ambient 
    Air Quality Standards for the State of Colorado'' was included in the 
    September 16, 1997 Steamboat Springs SIP submittal for informational 
    purposes only.
    * * * * *
        3. Section 52.329 is amended by revising paragraph (a) to read as 
    follows:
    
    
    Sec. 52.329  Rules and regulations.
    
        (a) On January 14, 1993, the Governor of Colorado submitted 
    revisions to the State's nonattainment new source review permitting 
    regulations to bring the State's regulations up to date with the 1990 
    Amendments to the Clean Air Act. With these revisions, the State's 
    regulations satisfy the part D new source review permitting 
    requirements for the following nonattainment areas: the Canon City, 
    Lamar, Pagosa Springs, Aspen, Telluride, and Steamboat Springs moderate 
    PM10 nonattainment areas, the Denver/Metro Boulder, 
    Longmont, Colorado Springs, and Fort Collins moderate carbon monoxide 
    nonattainment areas, the Greeley not classified carbon monoxide 
    nonattainment area, and the Denver transitional ozone nonattainment 
    area.
    * * * * *
        4. Section 52.332 is amended by adding paragraphs (g) and (h) to 
    read as follows:
    
    
    Sec. 52.332  Moderate PM10 nonattainment area plans.
    
    * * * * *
        (g) On March 17, 1993, December 9, 1993, and April 22, 1996, the 
    Governor of Colorado submitted the moderate PM10 
    nonattainment area plan for Telluride. The submittals were made to 
    satisfy those moderate PM10 nonattainment area SIP 
    requirements which were due for Telluride on November 15, 1991. The 
    December 9, 1993 submittal was also made to satisfy the PM10 
    contingency measure requirements which were due for Telluride on 
    November 15, 1993.
        (h) On September 16, 1997 the Governor of Colorado submitted the 
    moderate PM10 nonattainment area plan for Steamboat Springs. 
    The submittal was made to satisfy those moderate PM10 
    nonattainment area SIP requirements which were due for Steamboat 
    Springs on July 20, 1995.
    
    PART 81--[AMENDED]
    
        1. The authority citation for part 81 continues to read as follows:
    
        Authority: 42 U.S.C. 7401-7671q.
    
        2. In Sec. 81.306, the table for Colorado-PM10 
    Nonattainment Areas is amended under Routt County (part) by revising 
    the entry for ``The Steamboat Springs Area Airshed'' to read as 
    follows:
    
    
    Sec. 81.306  Colorado.
    
    * * * * *
    
                                           Colorado--PM-10 Nonattainment Areas                                      
    ----------------------------------------------------------------------------------------------------------------
                                                         Designation                          Classification        
              Designated area           ----------------------------------------------------------------------------
                                            Date                  Type                  Date            Type        
    ----------------------------------------------------------------------------------------------------------------
                                                                                                                    
                      *                  *                  *                  *                  *                 
                                          *                  *                                                      
    Routt County (part)--Steamboat         1/20/94  Nonattainment..................    1/20/94  Moderate.           
     Springs.                                                                                                       
    On the East--The Routt National                                                                                 
     Forest.                                                                                                        
    On the South--The southern border                                                                               
     of sections 19, 10, 21, T4N, R84W                                                                              
     of the 6th P.M. and the southern                                                                               
     border of sections 23, 24, T4N,                                                                                
     R85W of the 6th P.M.                                                                                           
    
    [[Page 68196]]
    
                                                                                                                    
    On the West--Beginning at the                                                                                   
     southwestern corner of section 23,                                                                             
     T4N, R85W of the 6th P.M. North                                                                                
     along the western border of                                                                                    
     sections 23, 14, 11, T4N, R85W.                                                                                
     Thence, along the ridge which                                                                                  
     bisects sections 35, 36, 25, 24,                                                                               
     13, 14, 11, 12, 1, T5N, R85W, and                                                                              
     sections 36, 25, 24, T6N, R85W.                                                                                
     Thence heading northwest along the                                                                             
     ridge which bisects sections 23,                                                                               
     15, 10, 9,4, T6N, R85W of 6th P.M.                                                                             
     Thence, heading northeast along                                                                                
     the ridge which bisects sections                                                                               
     33, 34, 35, 36, 25, T7N, R85W and                                                                              
     sections 30 and 10 of T7N, R84W.                                                                               
     Thence, north along the N \1/2\ of                                                                             
     the western edge of section 19, to                                                                             
     the NW corner of section 18, T7N,                                                                              
     R84W.                                                                                                          
    On the North--The northern boundary                                                                             
     of sections 16, 17, 18, T7N, R84W                                                                              
     of 6th P.M.                                                                                                    
                                                                                                                    
                      *                  *                  *                  *                  *                 
                                          *                  *                                                      
    ----------------------------------------------------------------------------------------------------------------
    
    * * * * *
    [FR Doc. 97-33958 Filed 12-30-97; 8:45 am]
    BILLING CODE 6560-50-P
    
    
    

Document Information

Effective Date:
3/2/1998
Published:
12/31/1997
Department:
Environmental Protection Agency
Entry Type:
Rule
Action:
Direct final rule.
Document Number:
97-33958
Dates:
This action is effective on March 2, 1998 unless adverse comments are received by January 30, 1998. If the effective date is delayed, timely notice will be published in the Federal Register.
Pages:
68188-68196 (9 pages)
Docket Numbers:
CO-001-0006a & CO-001-0021a, FRL-5934-2
PDF File:
97-33958.pdf
CFR: (4)
40 CFR 52.320
40 CFR 52.329
40 CFR 52.332
40 CFR 81.306