2004-018B - Laserfiche WebLink

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INDIAN RIVER COUNTY MITIGATION REEF PROJECT TECHNICAL AND ENVIRONMENTAL SPECIFICATIONS consent of the COUNTY'S representative . The CONTRACTOR shall not be paid for any material placed outside the designated locations or not in accordance with these Technical and Environmental Specifications . 17 . 10 Minimum Clearance . The top of placed rock shall not be above -6 feet relative to Mean Lower Low Water ( MLLW ) or —7 .65 ft NGVD , in accordance with conditions of the Permits . 17 . 11 High Relief High Complexity ( HRHC) . As indicated in the plans , the HRHC reef shall have a vertical relief of between 3 feet and 6 feet above the bottom and boulders will in some areas be stacked with overlapping for interlocking of individual stones. The Mitigation Area footprint will contain approximately 20% open sand surface , designated in the Plans and construction drawings as the 120-foot by 10-foot rectangular spaces located between the 120400t by 50-foot reef units . The boulders used in the construction of the HRHC reef shall be placed such that individual boulders have multiple points of contact with other stones , contacting all adjacent stones to the greatest degree possible . There shall be height variation across the structure . The most seaward and landward portions of each 120-foot by 50-foot reef rectangle ( i . e . , the complete outside perimeter of the combined HRHC rectangular reef structures ) shall have a high structure with the maximum allowed vertical from the bottom of the adjacent (sand ) bed . The seaward "crest" of the HRHC mitigation area shall be at least two stones in vertical relief for stability. The landward and seaward portions of the structure shall have a1 : 3 slope off of the bed for stability. The outside perimeter of the HRHC mitigation area shall have a high relief as compared to portions of the structure toward the center, which shall vary between the lowest acceptable vertical relief (34eet) and the highest acceptable vertical relief (6-feet) , and shall include portions where the vertical relief is between these limits . The center portion of the Mitigation Reef Area shall consist of one layer, two layers , and three layers of stones in an equal proportion within each individual 120-foot by 50-foot rectangle to create the desired complexity. If an equal proportion of high relief and low relief structure is not present within the reef units , such that the CONTRACTOR is found to be placing an unequal proportion of one layer rock or three layer rock , the COUNTY may require the CONTRACTOR to adjust the proportions of the placed rock vertical relief. Layered stones shall overlap and interlock with surrounding stones to the highest degree possible to ensure stability of the reef. A total of 4 . 96 acres of HRHC reef shall be constructed as shown in the Plans . Additionally , material shall be placed in accordance with Section 18 of these Technical and Environmental Specifications . TS- 12