Engineering and Contracting . of adeep sand in the river bottom and stratifiedsedimentary deposits of clayey silt along thebanks. The average height of this milesof river levee is 15 ft. and approximately4,500,000 cu. yds. of material were necessaryto construct a bank of sufficient stability to beabsolutely safe under conditions of maximumflood. Most of the recent levee work has beendone with large clam-shell dredges having 5or 6 cu. yd. buckets, which pile the river sandup along the hanks after clearing the timberand brush from the site. These sand banks to the existing levees across the
Engineering and Contracting . of adeep sand in the river bottom and stratifiedsedimentary deposits of clayey silt along thebanks. The average height of this milesof river levee is 15 ft. and approximately4,500,000 cu. yds. of material were necessaryto construct a bank of sufficient stability to beabsolutely safe under conditions of maximumflood. Most of the recent levee work has beendone with large clam-shell dredges having 5or 6 cu. yd. buckets, which pile the river sandup along the hanks after clearing the timberand brush from the site. These sand banks to the existing levees across the river wlunthis minimum flood plane width was used. IIR.^C LINE Retaining dikes. Fig. 1, are thrown up firstby drag line excavators mounted on truckshaving 10 wheels in all running on two stand- The efficiency of operation increased verymaterially after the crews became trained tohandle this particular character of construc-tion. The levermen worked 6 hours on and12 hours off, making an average of 8 hoursper Fig. 2. Filling in Sand Core Using Pipe with Bottom Openings or Traps. ard gage parallel tracks. The booms are 100ft. in length and .3% and 4M; cu. yds. Bucy-rus and Page buckets are employed in thevarying material encountered. These draglines backed down the cleared right of way,digging a deep cut-off trench of sufficient sizeto furnish material for the two retaining dikeson either toe of the finished levee. The crownof these dikes was kept about 6 ft. below thefinished top of the levee and was made 5 with a natural slope of about IV2 to total yardage included in this drag linework for the river levee is 1,224,400 cu. operation of Drag Line No. 2, which didfiO per cent of the work, is given in Table actual cost of excavating this 743,050 SUCTION DREDGE. The suction dredge used was built by theYuba Construction Co., of Marysville, Cal.,under the direction of Mr. S. L. G. Knox,now general manager of the Natomas Con- TABLE I.—OP
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