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INDIAN RIVER COUNTY MITIGATION REEF PROJECT TECHNICAL AND ENVIRONMENTAL SPECIFICATIONS any recently exposed or Ephemeral Hardbottom not identified on the Plans . Any damage to the hardbottom during operations is the sole responsibility of the CONTRACTOR . 17 . 5 . 1 Cables : Several transcontinental fiber optic cables are present in the vicinity of the Work Area . A Cable Avoidance Buffer Area has been established around these cables to avoid damage to the cables by vessels , cable/anchor drags , or reef materials . The CONTRACTOR shall remain outside of this Cable Avoidance Buffer Area at all times and shall not allow vessels , equipment , materials , or anchors to encroach on this Area . Any damage to the cables during operations attributable to non-compliance by the CONTRACTOR is the sole responsibility of the CONTRACTOR . Any such damage shall be reported at once to COUNTY and ENGINEER , so that the appropriate parties can be notified . 17 . 6 Undersized Rock. 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 such material is a minimum of 200 pounds and is placed/secured within a given rock pile that would render it immoveable by wave action subsequent to placement . 17 .7 Notification . The CONTRACTOR shall notify the COUNTY at least 24 hours prior to the time of each departure of the barge and material to the reef placement sites ( Mitigation Area ) . 17 . 8 On -Site County Supervision . Under no circumstances shall rock be placed in the water without the on-site COUNTY representative 's acceptance of the barge 's final moored position . The CONTRACTOR shall receive a verbal authorization from the COUNTY prior to off-loading any rock and shall remain on-site until released by the COUNTY. Precise positioning of the barge is required in order to avoid any impacts from rock into existing artificial or natural reef structures . Off-loading of rock may be stopped at any time by the COUNTY in order to make an inspection dive to check placement of the rock or to require repositioning of the barge due to other factors . The COUNTY, the FDEP , the USACE and additional personnel shall be allowed access to the materials barge and work vessels , at the request of the COUNTY. All costs due to this supervision shall be included in the unit cost for material and placement. 17 . 9 Rock Deployment . The barge shall be appropriately stabilized , according to all applicable rules and standards , prior to the deployment of rock in the Mitigation Area . Material placement shall be observed by the CONTRACTOR ' S divers and monitored by the COUNTY to ensure correct placement to the satisfaction of the COUNTY, that the rock is placed as required . The CONTRACTOR shall ensure to the satisfaction of the COUNTY that the CONTRACTOR ' S method of deployment will ensure placement as shown in the plans . Wind and currents may change quickly offshore ; therefore , the deployment of rock may be stopped at any time , as often as required by the COUNTY, to confirm correct placement of the rock by the CONTRACTOR ' S diver, or by other means , as deemed suitable by the COUNTY under the prevailing conditions . No rock shall be placed without TS- 11