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broad-leaved deciduous vegetation and are seasonally to semi -permanently flooded. These wetlands have been impacted by the historic ditching that has occurred adjacent to the parcel. Wetland boundaries are approximate and should not be used for permitting purposes. During the next phase of the project, field delineation of wetland boundaries should be conducted to determine the state and federal jurisdictional extents of wetlands on site in advance of permitting. Additionally, field evaluation of wetland quality should also be evaluated during the field delineation. Wetland boundaries are subject to state and federal regulatory agency verification and approval during the permitting process. Figure 3-1: Preliminary Wetland Extents Wetland mitigation would be necessary to offset any impacts as a result of the project. CDM Smith researched two such potential mitigation efforts to offset the 10.6 acres +/- of wetlands. During the desktop evaluation, the project is estimated to require 10.6 Uniform Mitigation Assessment Method (UMAM) credits to off -set direct and secondary wetland impacts. The final number of credits necessary would depend on the total wetland acreage on site determined by field delineation and wetland quality within the impact area. Mitigation bank credits could be purchased from Mary A Mitigation Bank in Brevard County at a price of $45,000 per credit for joint state and federal UMAM credits. Thus, the estimated total project mitigation cost using a mitigation bank would be $477,000. As part of the due diligence effort, the parcel adjacent to the site, as shown in Figure 3-2, was looked at to potentially increase the footprint of the site while adding frontage along the eastern side of the lateral J canal. FDOT was contacted to see if there would be any interest in a possible swap between their 4.7 acre site and a 3.12 acre county -owned parcel in the near vicinity. During the discussions, CDM Smith did a desktop evaluation of the FDOT site and found that a majority of the FDOT land is classified as freshwater/forested wetlands and would have to be mitigated should that area be used in conjunction with the reservoir project. Therefore, staff does not recommend pursuing discussions with the FDOT at this time. J:\Utilities\UTILITY - Engineering\WATER\Alternative Water Supply\Portofino Preserve aka Blackstone 83 acre site\Due Diligence Report for BCC 02_16_2016\Agenda - Due Diligence Report and OPC for 83 acre site for BCC meeting 02_16_2016 v2 cmc.docx Page 5 of 14 103