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INDIAN RIVER COUNTY MITIGATION REEF PROJECT TECHNICAL AND ENVIRONMENTAL SPECIFICATIONS have multiple points of contact with other stones within the placement area , touching all adjacent neighbors to the highest degree possible . The High Relief High Complexity ( 120400t x 50-foot) reef units shall have a total vertical relief ranging between 3 feet and 6 feet, with no more than 10% of the total planform area extending above 5 feet above the bottom and not more than 30% of the plan area to be a single layer of stone . The Low Relief Low Complexity ( 120-foot x 50-foot) reef units shall have a total vertical relief ranging between 1 feet and 2 feet, with no more than 10% of the total planform area extending more than 3 feet above the bottom . 19 . ENVIRONMENTAL PROTECTION PLAN 19 . 1 Avoidance of Protected Species . The CONTRACTOR shall avoid direct and indirect impacts to any threatened or endangered species , including manatees , sea turtles , and other marine mammals . Furthermore , the CONTRACTOR shall avoid direct and indirect impacts to existing artificial and natural reefs . Reef construction shall be limited to daylight hours only. Vessels , barges , and equipment shall be operated in a manner to avoid manatees and other endangered species . Operations shall immediately cease when endangered species are observed in the vicinity of operations within the Project Area ; at this time , the movements of the animals are to be continuously observed and documented by the CONTRACTOR. Operations shall not resume until the animals have moved a safe distance (a minimum of 200 feet) from the Work Area . The CONTRACTOR shall instruct all personnel associated with construction of the project about the presence of manatees in the vicinity of the staging area and the need to avoid collisions with these animals . Any collision with , or injury to , a manatee must be reported immediately to the Florida Fish and Wildlife Conservation Commission ( FWC) at ( 1 -888- 404- FWCC) and the COUNTY at (772-567-8000 , EXT. 1568 ) . All personnel should be advised there are civil and criminal penalties for harming , harassing , or killing endangered species or damaging reefs . 19 .2 Sea Turtle Protection and Monitoring . Endangered and threatened species of sea turtles are known to occur, particularly during and around the time of their nesting season ( March 1 through October 31 ) , in the Work Area for this project. The CONTRACTOR shall comply with all conditions of the Endangered Species Act of 1973 . There are civil and criminal penalties for harming , harassing or killing sea turtles . All incidental takes of sea turtles during dredging or construction operations must be reported immediately to the Florida Fish and Wildlife Conservation Commission ( FWC) at ( 1 -888-404- FWCC) and the COUNTY ( 772-567-8000 , EXT. 1568 ) . Upon locating dead or injured sea turtles the COUNTY and FWC should be notified . 19 . 3 Reef Protection and Monitoring . Hardbottom biological communities in the vicinity of the Work Area are to be STRICTLY AVOIDED by the CONTRACTOR during all mobilization , demobilization , reef placement, transit activities and idle . Known reef areas are specified in the Plans , however, the reef is ephemeral in nature and reef not specified on the plans may become exposed periodically . The CONTRACTOR shall avoid direct and indirect impacts to all exposed and/or Ephemeral Hardbottom and reef areas during all phases of the project . The CONTRACTOR shall be liable for any non - TS- 15