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~ ~, '-' ..-l o (-") -::> However, as discussed above, the land needs would be reduced to 15 and 30 feet, respectively, in most cases where desired by the landowner. Where it is necessary to avoid impacts to bridges and residences along the north side of the canal, a minimal amount of lining with shotcrete (see the non-viable Alternative SC) or concrete would be necessary. For Reach lA, an estimated 2,100 feet would be lined with shotcrete or concrete. within Reach lB, a minimal amount of shotcrete is proposed. Such design requirements for Reach 2 have not yet been determined. Modified Alternative M3 - Modified Alternative M3 (Membrane 3) is similar to Modified Alternative Ml in the lining method and the amount of additional land to be acquired, but differs from Alternative Ml in that the additional fee land would be acquired as a negotiated ROW, with fee title to the land remaining in private ownership. The ROW would allow the u.s. to use a strip of land equal to the amount of the proposed fee land purchased in Modified Alternative Ml for O&M of the canal. Landowners could not use this ROW for activities that would interfere with the construction and O&M of the canal without written authorization from the u.S. When the additional ROW is obtained, any canal ROW currently reserved under the 1890 Canal Act would still be purchased as fee land under this alternative, and the associated permitting and fencing actions described later would be implemented. The south fee land boundary would be fenced, and documents for the reserved ROW on the north side would contain a right for the u.s. to fence the ROW boundary for O&M, safety, boundary designation, and/or livestock control reasons. Alternative M4 - Under Alternative M4 (Membrane 4), the canal would be membrane lined as in Ml, but, wherever possible, the centerline of the new canal for the entire length of a given reach would be shifted between 15 and 25 feet to the south to avoid the purchase of additional fee land for the canal corridor. New acquisitions of fee land would be required in some problem areas where the canal alignment is planned through significant cut or fill sections, where existing improvements do not allow enough room to shift to the south, in areas where county roads utilize the canal O&M road, or where the canal crosses under bridges. Between 45 and 105 feet of temporary ROW could be required; typically 65 feet would be desired. Figure 2 depicts the typical membrane-lined canal cross section and associated land requirements for this alternative. While the purpose of Alternative M4 is to completely avoid the purchase of additional fee land, exceptions are expected where the shifting is not physically feasible. Even though fee land purchase costs are saved under this alternative, it would still be more expensive than 12