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5050.4 3/21/80 d Control of runoff. e Waste and spoils disposal so as not to contaminate ground and surface water. f Control of use of pesticides, herbicides, and fertilizer. g Maintenance of vegetative buffers to reduce sedimentation and delivery of chemical pollutants to the water body. h Land use controls (Executive Order 11988 directs Federal agencies to take floodplain management into account in evaluating land use plans and to require land and water resource use appropriate to the degree of hazard involved). (d) If the analyses performed in accordance with the preceding paragraph indicate significant impacts on a base floodplain, a statement to this effect shall be included in the environmental assessment. Further analysis appropriate for an environmental impact statement is contained in paragraph 85.1. (e) If the proposed action and reasonable alternatives are within the limits of a base floodplain, this is considered by DOT Order 5650.2 to be a floodplain encroachment. If the proposed action includes relocation housing built or moved to a new site within a base floodplain, this also con- stitutes encroachment. It is not encroachment if the only step being taken in the floodplain is the relocation of persons into existing housing units. In this latter situation, potential occupants shall be advised if the relocation housing is located in a base floodplain and be offered alternative comparable housing at their option. (f) It is DOT policy, in accordance with Executive Order 11988, to avoid where practicable encroachments in base floodplains.by DOT actions. If there is a practicable alternative which solves the problem and avoids the encroachment, this alternative shall become the proposed action. The term "practicable" is defined under Wetlands Impact in paragraph 47e(11)(e) above. If a practicable alternative is put forward as the new proposed action, no further analysis is necessary if the new proposed alternative does not otherwise significantly impact the base floodplain. The environmental assessment shall document that the initial proposed action was eliminated from further study because of base floodplain encroachment. (g) If the proposed action and reasonable alternatives would encroach within the limits of a base floodplain, the following instructions apply: 1 The environmental assessment shall indicate briefly why the action is proposed to be located in a floodplain and why there are not considered to be any practicable alternatives outside the base floodplain. Page 50 Chap 5 Par 47