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• constitutes 5 acres, will be stabilized using dust suppressants as neces- <br />sary during the 1982 - 1984 period. The remaining 4 acres serve as the <br />site for offices and shop facilities, and those facilities will remain in <br />service. <br />Area 5 - Tosco Flats <br />Area 5a (Access Road - Trailers to Old Retort) covers 20 acres, including <br />10 acres that are to be permanently revegetated during 1982. Topsoil <br />available from construction of the Valley Access Road has been respread <br />on 8 of the 10 acres. This area is nearly flat lying except for the 2 <br />acres of 4:1 slopes on the reconstructed stream channel. Four acres of <br />road will be stabilized using dust suppressants as necessary during the <br />• 1982 - 1984 period. <br />The remaining 6 acres are the site of the Semi-Works Plant, associated <br />facilities, and a maintenance shop. The final surface configuration of <br />the Semiworks area, at least in this interim period, depends on timing of <br />the removal of the existing Semi-Works and the results of an engineering <br />study that addresses alternatives for resloping the spoil pile at the <br />base of Davis Gulch. The source of material for regrading will be the <br />excess fill currently existing in Area 19b (See also discussion in Exhibit <br />G.2.3 regarding stream hydrology in this area). There will be extensive <br />water channel work associated with the site but the details have not <br />yet been developed. <br />• <br />