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INDIAN RIVER COUNTY MITIGATION REEF PROJECT TECHNICAL AND ENVIRONMENTAL SPECIFICATIONS responsible for misplaced material per Section 27 and Turbidity Control per Section 19 . 5 of these Technical Specifications . 17 .3 Modifications . Reef design and extent , as identified in the construction plans , may be field adjusted by the COUNTY. The CONTRACTOR shall be agreeable to design modifications , provided that the modifications do not substantially alter the forms of the Mitigation Area indicated in the Plans or change total placement tonnage by greater than 15% , all unit costs indicated on the bid form shall applicable to the altered placement tonnage . 17 .4 Drop Tests . Shore-based material drop tests will be required to ensure the structural integrity of the material being used in the construction of the mitigation site and to ensure that the material can withstand a drop onto a hard surface without substantial fracturing or cracking . Prior to the beginning of construction , a total of five (5 ) drop tests shall be performed either at the quarry stone source or at the staging area . Following the placement of 10 , 000 tons of stone , three (3 ) additional drop tests shall be preformed with an additional three (3) drop tests performed following the placement of each additional 10 , 000 tons of stone (that is , three tests each at the 20 , 000 ton and 30 , 000 ton placement interval ) . Each stone tested shall conform to the material requirements outlined in these Technical and Environmental Specifications . Stones shall be dropped from a minimum height of eight (8 ) feet onto a 1 -inch thick steel plate placed on a firm , level surface . Additional drop tests of specific stones may be requested by the ENGINEER. The ENGINEER and the COUNTY must be notified in writing at least 24 hours prior to the performance of each drop test , and either the ENGINEER or the COUNTY must be present for each such testing for visual inspection of the dropped units . The ENGINEER shall determine whether any resulting cracks or fragmentation is substantial enough to warrant rejection of the selected unit(s ) and/or whether additional tests on stones are necessary. The ENGINEER shall provide the CONTRACTOR with written approval or rejection of the stone based on the results of the tests . All required safety precautions shall be taken to ensure the safety of CONTRACTORS personnel and all ENGINEER and COUNTY personnel individuals within the drop test area . 17 . 5 Site Conditions , Hardbottom : Bottom elevations in the mitigation reef placement area range from - 13 feet NGVD (- 14 .44 feet MLW ) to - 18 feet NGVD (- 19 .44 feet MLW ) . Sand bars located offshore of the reef site may be present that are shallower than the reef site , and may limit access of deep draft vessels and barges . Natural reefs lie within close proximity to the construction site , especially north and south of the mitigation area . It is the responsibility of the CONTRACTOR to determine locations of exposed and/or Ephemeral Hardbottom within anchoring and Work Areas , and to avoid damage to these features . Exposed , Ephemeral and/or buried hardbottom may limit available options or locations for anchoring or positioning a barge to offload rock . No anchoring or spudding shall take place on existing or mitigative hardbottom . Due to the ephemeral nature of much of the hardbottom in the area , the CONTRACTOR must take care not to damage TS- 10