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APT I M April 11, 2018 ® Page 8 of 10 in as expeditious a manner as possible. Task 6: Cost The lump sum cost for this task is $15,924.00. Task 7: Include Offshore Borrow Area as Sand Source (Optional) The Sector 5 Beach and Dune Restoration Project is currently being designed and permitted with fill. sources from upland sand mines. The proposed Sector 3 and Sector 7 renourishment projects will likely include offshore sand as a potential sand source. Considering the.similar project development schedule, it may be conceivable to utilize the same offshore borrow area for multiple concurrent projects. This could increase the potential that an offshore borrow source be more cost effective than upland sources for the Sector 5 project. As such, APTIM will perform the following task to include an offshore borrow area as a sand source for the Sector 5 project utilizing existing and available data and information. This work assumes that the proposed offshore borrow area has been sufficiently investigated and developed (per permitting agency requirements) for the planned Sector 3 and/or Sector 7 project, or for a regional County -wide sand search investigation. This task does not include any field work or geotechnical laboratory analyses. Task 7: Scope of Work If the County decides to move forward with offshore sand as a potential source for the Sector 5 Project, APTIM will determine if sufficient sand volume is available within the offshore borrow area to construct the Sector 5 project. If sufficient volumes exist, the following work is anticipated for inclusion of the offshore borrow area for the project.. • The offshore borrow area will be designed utilizing previously collected geophysical and hydrographic data. This will include developing composite sediment characteristics and a composite grain size distribution for the proposed offshore borrow area. The composites will be used to analyze the compatibility of the proposed offshore borrow area with the native sediment of Sector 5. Beach sand samples collected in 2015 will be utilized to describe the native sediment of Sector 5. • Coordination with the permit and regulatory agencies will be initiated to identify the data and information submittals required for modification of the existing permit to include the offshore borrow area. The requisite data and information will be assembled and submitted. This will include establishing the need to permit the travel/pipeline corridors from the borrow area to the pumpout site on the beach and designing the corridors to minimize the potential for impacts to offshore resources and infrastructure (i.e. AT&T cables). Due to the close proximity of the nearshore hardbottom in the project area, it may be challenging to utilize the hydraulic fill method to accomplish relatively thin fill densities. Special considerations to project logistics may need to be considered to utilize this method, including stockpiling material and/or pre -excavating and diking fill areas prior to placement. We will coordinate with the agencies to help develop reasonable and acceptable project parameters. A letter will be drafted requesting a permit modification, which will include figures and tables describing the proposed offshore IRC Sector 5 — 2018029 — W0#1: Pre -Construction Services Proj. #631236907