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Mitigation and Modification Alternatives seven agricultural structures which were evaluated in the most detail. Estimates for diversion structures at the Maybell Canal and Patrick Sweeney/K. Diamond sites are based on approximate quantity take-offs using the available site surveys. It is assumed that diversion rehabilitation at the other five sites would consist of the construction of structures similar to the Craig diversion structure. The Craig structure costs were updated and then adjusted for each site based upon horizontal and vertical dimensions with some differentiation as needed to reflect individual site characteristics. The costs given are for construction only with a range indicating the level of accuracy of this conceptual estimate. The costs do not include: • Non-construction costs including engineering, fishery, ecological, mitigation, permitting, legal, administrative; • Any physical channel modifications outside of the diversion structure construction limits; • Any fish exclusion, collection, capture, transfer or monitoring facilities; • Flow gaging facilities; • Headworks or water delivery system improvements; • Access improvements; • Land or right-of-way acquisition. Table 4-1 Structure Modification Cost Estimates Marshall Roberts Ditch $420,0004500,000 Williams Irrigation Ditch $380,0004460,000 Deep Cut Irrigation Ditch $350,0004410,000 Cary Ditch Company Ditch $490,0004550,000 Shelton Ditch $320,0004380,000 Maybell Canal Diamond Ditch Patrick Sweene /K $1,000,00041,200,000 000 0004450 $350 . y , , ENVIRONMENTAL AND PERMITTING CONSIDERATIONS The most significant activity associated with permitting modifications and improvements to diversion structures may be compliance with the requirements of the National Environmental Policy Act (NEPA) (42 U.S.C. 4321 - 4347). It is possible that involvement of federal lands or funds or actions taken by Federal agencies will require the preparation of an Environmental Impact Statement (EIS) and the associated public involvement process. Because more than one Federal agency could be involved in the permitting process, a decision must be made to determine the lead agency that would supervise the preparation of an EIS. It may also be possible for a combination of Federal, state, and local agencies to act as joint lead agencies. 4-12 (j