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INDIAN RIVER COUNTY MITIGATION REEF PROJECT TECHNICAL AND ENVIRONMENTAL SPECIFICATIONS structural defects . Each stone must have a minimum diameter of at least 2 . 5 feet and have a maximum diameter of no greater than 5 feet. Due to unavoidable damage from handling , a maximum of 5% of the boulder material can be less than these dimensions provided it is a minimum of 200 pounds . To ensure a minimum 6-foot navigation depth at low water, no boulder material greater than 6 feet in diameter will be acceptable . Material placement practices for the construction of the HRHC and LRLC reef structures are detailed in Section 17 of these Technical and Environmental Specifications , 12 .2 Contract Quantities . Potential bidders are advised that reef material quantities may be modified by the COUNTY. Payment for modified quantities shall be in accordance with Section 17 . 3 of these Technical and Environmental Specifications . 13 . PRIMARY EQUIPMENT REQUIRED 13 . 1 Tug , barge(s) , and crew. For all work offshore , the CONTRACTOR shall provide a tug and ABS load-line barge (s ) with current certificates of inspection capable of handling such wind , weather, and sea conditions that are typical for east coast of Florida . The tug , and/or the CONTRACTOR'S other support vessel (s) accompanying the tug , shall be equipped with an electronic depth sounder capable of measuring the height of the finished reef and the depth of the project site to an accuracy in accordance with USACE HYDROGRAPHIC SURVEYING document number EM 1110-2- 1003 dated October 1994 ( updated January 1 , 2003) and a real-time Differential Global Positioning System able to navigate to a specific site and record final locations of each load of materials placed . The project horizontal control shall be referenced to the North American Datum (NAD '27 ) , Florida State Plane , East Zone ; and the project vertical datum shall be referenced to the National Geodetic Vertical Datum ( NGVD '29) , unless referred to otherwise herein and on the plans . The barge (s ) shall be capable of spudding or anchoring for work in nearshore waters . The barge (s ) , tug , and the crew shall be licensed and approved by the U . S . Coast Guard for the scope of work required . The CONTRACTOR shall have an operational VHF radio or cell phone on the tug and/or other support vessel (s ) to maintain communication with COUNTY representatives during deployment operations . The tug , barge , and all other equipment used must feature sufficiently shallow drafts to avoid any contact whatsoever with exposed and/or Ephemeral Hardbottom in the Project Area , regardless of tides and sea conditions . Furthermore , in order to protect the exposed and/or Ephemeral Hardbottom features , any anchoring must be made utilizing floating polypropylene mooring lines of sufficient length and strength , and in such a manner to entirely eliminate any contact between the mooring lines and the exposed and/or Ephemeral Hardbottom . All cable shall be kept in good condition at all times during vessel operations , including transiting and particularly during approach to and operation within the Mitigation Area . Any and all breaks and other damage of any nature whatsoever shall be promptly repaired to avoid vessel and/or equipment drift and subsequent potential damage to TS-7