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5050. 4 3/21/80 (e) The text of the environmental assessment shall include a description of any mitigation measures existing or planned to minimize noise impacts. If a noise analysis is required, sufficient information shall be presented to permit lay and technical readers to relate the noise level data used to an understanding of its potential effects. The text and graphics shall support"theconclusions reached on noise impacts. The graphics shall include map(s) of the existing airport, proposed airport development, and the airport vicinity. Existing and planned land uses shall be illustrated, including the location of the nearest noise sensitive area(s). The illustra- tions shall be large enough and clear enough to be readily understood. When noise contours are developed, they shall be superimposed on a land use map(s) by prominent, legible lines and be clearly labeled. (f) The above paragraphs refer to Ldn as the methodology to use for noise analysis. An acceptable exception is use of the Community Noise Equivalent Level (CNEL) where required to meet state requirements as in California. The Noise Exposure Forecast (NEE) methodology may also be used in environmental assessments or other analyses begun prior to the effective date of the order. (2) Compatible Land Use. (a) The compatibility of existing and planned land uses in the vicinity of an airport is usually associated with the extent of noise impacts related to that airport. In this context, if the noise analysis described above concludes that there is no significant impact, a similar conclusion usually may be drawn with respect to compatible land use. However, if the proposal would result in other impacts exceeding thresholds of significance which have land use ramifications (for example, disruption of communities, relocation, induced socioeconomic impacts, wetlands, floodplains, coastal zones, critical habitat of endangered or threatened species), the effects on land use shall be analyzed in this context and described accordingly under the appropriate impact category with any necessary cross-references to the Compatible Land Use section to avoid duplication. (b) The Land Use section of the environmental assessment shall include documentation to support the required sponsor's assurance under section 18(a)(4) of the Airport Act that appropriate action, including the adoption of zoning laws, has been or will be taken, to the extent reasonable, to restrict the use of land adjacent to or in the immediate vicinity of the airport to activities and purposes compatible with normal airport operations, including landing and takeoff of aircraft. The assurance must be related to existing and planned land uses. (c) FAA officials shall contact the sponsor and representatives of affected communities to encourage the development of appropriate compatible land use controls early in the project planning stage. The environmental assessment shall document what is being done by the jurisdiction(s) with land Page 30 Chap 5 Par 47