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Salt River PM10 State Implementation Plan Revision
On Aug. 4, 1997, EPA approved the Arizona Department of Environmental Quality's 1997 plan, known as the "microscale plan" affecting particulate matter sources in the Maricopa County Serious PM10 Nonattainment Area, which includes the Salt River monitoring site (62 FR 41856). In 2002, EPA found Arizona's plan inadequate to achieve attainment of the 24-hour National Ambient Air Quality Standards (NAAQS) for PM10 in the Salt River monitoring site area, noting exceedances of the 24-hour PM10 NAAQS in the Salt River area after May 1998, the date by which the plan was supposed to yield attainment of the standard (67 FR 44369  , July 2, 2002).
In response to EPA's request for revision of ADEQ's 1997 plan to enhance PM10 controls in the Salt River monitoring area, ADEQ, coordinating with Maricopa County Environmental Services Department (MCESD), EPA, and others, completed compiling data in the area in 2002, and throughout 2003, analyzed the data and researched appropriate controls. In Jan. 2004, ADEQ submitted preliminary plan revisions to EPA to meet EPA's Feb. 2, 2004, submission deadline. Because all necessary plan commitments and required rulemaking processes had not been completed at that point, ADEQ has continued, since Feb. 2004, to make necessary refinements to emissions inventory and modeling; hold workshops to inform stakeholders, the public, and state, county, and local jurisdictions concerning PM10 control measures needed and to work with them to develop control measure commitments; to participate in Maricopa County rule revision processes; and to gather data on progress toward implementation of prior plan control measures.
On Aug. 2, 2004, ADEQ submitted the most recent plan revision, the Revised PM10 State Implementation Plan for the Salt River Area, to EPA. This document replaces the Feb. 2004 submission. The objectives of the Salt River plan are to meet EPA requirements to implement adequate control measures by Feb. 2, 2005, and demonstrate attainment of the 24-hour federal standard for PM10 pollution by Dec. 31, 2006, in the Salt River Study Area. In addition, EPA requires that control measures applied to significant sources of PM10 emissions in the Salt River Study Area be applied to similar sources throughout the Maricopa County Serious PM10 Nonattainment Area.
This latest revision to the Salt River PM10 SIP provides additional details on the effectiveness of control measures and the revisions of Maricopa County Rules 310, 310.01, and 316 that were committed to in the PM10 SIP revision submitted to EPA in August 2004. A Public Hearing to receive comments on the this revision has thus been scheduled for July 25, 2005. The Proposed PM10 State Implementation Plan (SIP) with Appendices, Technical Support Document and Public Hearing Notice can be obtained by clicking on the links below.
For more information on the proposed SIP revisions, continuing rule revisions and stakeholder processes, please contact:
Diane Arnst
Air Quality Planning Section
Arizona Department of Environmental Quality
1110 W. Washington St.
Phoenix, AZ 85007
(602) 771-2375
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