Approval and Promulgation of Implementation Plans; Designation of Areas for Air Quality Planning Purposes; State of California; PM-10; Redesignation of the Coso Junction Planning Area to Attainment; Approval of PM-10 Maintenance Plan for the Coso Junction Planning Area

Streszczenie

EPA is proposing to approve the State of California's request to redesignate to attainment the Coso Junction planning area (CJPA), which is currently designated moderate nonattainment for the particulate matter of ten microns or less (PM-10) national ambient air quality standard (NAAQS). EPA is also proposing to approve the PM-10 emissions inventory and the maintenance plan for the CJPA area, which includes control measures for Owens Lake, the primary cause of PM-10 nonattainment for the CJPA. The California Air Resources Board (CARB) has requested that EPA "parallel process" the redesignation submittal, maintenance plan, and related SIP submissions. Finally, EPA is proposing to find the contribution of motor vehicles to the area's PM-10 problem insignificant. If this insignificance finding is finalized, the area would not have to complete a regional emissions analysis for any transportation conformity determinations necessary in the CJPA.