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Air Quality Inc;:reaSed aircraft activity projected to utilize the improved facility will produce slightly escalated levels of emissions into the atmespbere. The impact of these increased emissions has been computed and evaluated relative to the National Ambient Air Quality Standards (Nl\PQS), is included in this sectioo and shown in Table 8.1. Section l76 (C) of the Clean Air Act Amendments of 1977 states, in part, that no federal agency shall engage in, support in any way, or provide financial assistance for, license or permit, or approve an activity which does not conform to a State Implementation Plan (SIP) after it has been awroved or promulgated under Section 1l0. 'l1le Act requires that, in developing the Plan, the states must designate all areas as Non-Attainment for those pollutants which are shown by monitored data or which are calculated by air quality modeling (or other methods determined by the u.s. Environmental Protection Agency (EPA) Administrator to be reliable) to exceed any National Ambient Air Quality Standards (NAAQS) for such pollutant. Part 5l.l2 provides that in any region where existing (measured or estimated) ambient levels of pollutant exceed the levels specified by an applicable standard, the plan shall set forth a control strategy which shall provide for the degree of emission reduction necessary for attainment and maintenance of such national standard. San Marcos Municipal Airport, located in southern Hays and northern caldwell Counties, is located in an area designated as in attainment for all pollutants specified in the NAAQS. Therefore, no control strateqies are required in the Texas State Implementation Plan (TSIP) as specified in the Clean Air Act Amendments. Computing and evaluating' the long term impacts of the improved airport facilities is, nevertheless, an integral part of the environmental assessment. An effective methodology developed for this determination involves c:x:mputing cxmoentrations of aircraft emissions and comparing them to the National Ambient Air CUality Standards (W\AQS). 'Ihis will allow the determination of relative impact. At San Marcos Municipal Airport, utilizing the projected aircraft activity levels for the year 2005, pollutant levels can be computed for a "worst case" analysis since aircraft operations are projected to continually increase from 70,000 operations in 1985 to 220,000 operations by the year 2005. 8.7