Borrow Area 



500 250 



1,000 m 



1,000 1,000 2,0003,000 ft 



^^ REDONDO 



V BEACH 



TORRANCE 



PALOS 

 VERDES 



Figure 6-22. Map of protective beach, Redondo Beach, California. 



18 meters below MLLW. The median diameter of the beach sand was 0.5 milli- 

 meter; the median diameter of the offshore sand ranged from 0.4 to 0.7 milli- 

 meter. The offshore sand was considered an excellent source of material for 

 beach replenishment. Several land sources were also investigated and found 

 suitable in quantity and quality for the project. 



Bids received in August 1967 for land hauling or ocean dredging ranged 

 from $1.40 per cubic meter ($1.07 per cubic yard) to more than $2.60 per cubic 

 meter ($2.00 per cubic yard). A contract was awarded to obtain the sand from 

 the ocean source. The contractor used a modified 40-centimeter-diameter (16- 

 inch) hydraulic pipeline dredge , with a water- jet head on the end of a 27- 

 meter (90-foot) ladder. Although the water- jet technique had been used in 

 excavating channels, filling and emptying cofferdams, and prospecting for 

 minerals in rivers, its application to dredging in the ocean appears to be 



6-30 



