of shore was divided into five segments or phases; each was to be handled by a 

 separate contract (see Fig. 6-24). 



The phase I contract included the beach between 96th and 80th Streets at 

 Surf side and about 0.8 kilometer of beach at Haulover Beach Park for a total 

 of 4.35 kilometers (2.7 miles). A total estimate of 2,248,000 cubic meters 

 (2,940,000 cubic yards ) of beach-fill material was placed. Work began on 

 this phase in May 1977 and had to be discontinued in October 1977 because of 

 rough seas, which normally occur during the winter months. Work resumed in 

 June 1978, with contract completion in November 1978. 



The phase II contract covered the 2.25 kilometers (1.4 miles) of Dade 

 County Beach between 80th and 83rd Streets, the northern part overlapping the 

 southern end of the first contract. This overlapping was done in all phases 

 to replace the losses experienced at the downdrift segment of the prior 

 contract during the time between contracts. The phase II contract called for 

 placement of 1,170,000 cubic meters (1,530,000 cubic yards) of beach fill, and 

 after a delayed start, work began in August 1978 at 63rd Street and proceeded 

 to the north. Prior to termination for the winter months, 56 percent of the 

 beach included under this contract had been placed. The remaining sections 

 were completed during the 1979 dredging season. 



The phase III contract involved the placement of 2,429,000 cubic meters 

 (3,177,100 cubic yards) of beach-fill material along 3.4 kilometers (2.1 

 miles) between 83rd and 86th Streets (see Fig. 6-23). In an attempt to com- 

 plete this contract in one dredging season, a part of the work was subcon- 

 tracted. Two dredges, the 70-centimeter (27-inch) dredge, Illinois, and 

 the 80-centimeter (32-inch) dredge, Sensibar Sons, worked simultaneously on 

 different sections of the beach. However, operations had to be discontinued 

 for a month beginning in late August because of Hurricane David and persistent 

 rough sea conditions. Dredging resumed for 2 weeks before termination for the 

 winter season and was again resumed in July 1980. The contract was completed 

 in October 1980. 



The phase IV contract called for placement of 1,682,000 cubic meters 

 (2,200,000 cubic yards) of fill on the beach, which extended from 36th to 17th 

 Streets, a 2.6-kilometer (1.6-mile) length. An added requirement of this 

 contract was the removal of all rock greater than 2.5 centimeters (1 inch) in 

 diameter. To accomplish this, the contractor built a three story grizzly-grid 

 rock separator on the beach. Any rock greater than 2.5 centimeters in diam- 

 eter was either stockpiled and hauled offsite or passed through a centrifugal 

 rock crusher. The crushed rock was conveyed and remixed with the screened 

 dredge slurry. The screened beach-fill material was then punjped to the 

 outfall. 



A booster pump was necessary because of the long distance between the 

 borrow and the fill areas and the utilization of the rock screening device. 

 The dredging associated with this contract began in May 1980 and was completed 

 in December 1981. Approximately 1,426,700 cubic meters (1,866,000 cubic 

 yards) of material was placed on the beach. 



The phase V contract called for the placement of 1,526,000 cubic meters 

 (1,996,000 cubic yards) of beach fill along the remaining 2.9 kilometers (1.8 

 miles) of the project from 17th Street to Government Cut. This phase began in 



6-35 



