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of w • The orientation, length, individual weight of armor stone and the on -center spacing of shore protection structures, as well as the total number of structures to be constructed in Sector 7, can only be adequately determined through detailed engineering analyses that is scheduled for completion in August - September 1999. Wave refraction/diffraction and shoreline evolution modeling may be required to establish such design parameters and to evaluate and validate the structures' function and benefits. Nearshore hardbottom resources exist within the plan view limits of each of the proposed sector beachfill projects. The character and exact extent of these resources, as well as anticipated primary and secondary impacts associated with beachfill construction, will be determine the final beach restoration fill volumes. A summary of "preliminary" design features for each of the BPP projects is provided in Table 10. 4.2 PROJECT COSTS Uniform sand unit prices are assumed for the purpose of plan development and costing purposes at $7 per cubic yard for the anticipated projects in Sectors 1, 2 and 3 to account for a probable single mobilization of dredging and beachfill equipment to construct all three (3) sector improvements sequentially. Essentially the mobilization fee is assumed to be approximately $1,000,000 and thus the unit sand placement is estimated at $6 per cubic yard. Mobilization of dredging equipment and work crews will be dependent upon sand source proximity to each of the sector beachfill sites, the dredge plant type necessary to properly access and excavate sand from the borrow area(s) and transport if to shore, the proximity of such equipment and crews to the project site at the time of project bidding, and whether one or more projects are anticipated to be bid sequentially. "-Q8(M 2REroarroRAf TMOIMWE 33