Engineering and Contracting . ge 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.
Engineering and Contracting . ge 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.—OPERATION OF DRAG LINE EX-CAVATOR. Digging =? time. o ji ?^^Crov/n-^ .-?Eor-fh BionKef A/o/e Qtverside. os: C4 O. •** 0 o * 1912— May 426 307 June 720 617 July 726 578 Aug 744 ,; Sept 720 .^eo Oct 744 597 Nov 720 604 Dec 702 £75 1913— Jan 741 627 Feb 66 51 Sept 314 232 Oct 258 166 Total ...6,884 5,507 •o >oBvta ?3 m to V c C = u 32,260 105 364 S9 S9 732 75 65,600 97 797 82 S4 767 65 98 746 73 S5 220 113 932 91 84 104,772 174 1,067 98 82 111,092 193 1,0S0 103 84 192 1,103 109 78 156 75 106 74 34,137 H7 740 46 64 22,588 136 242 93 a. ID-10111112lo-ll11 1313IS25 80 743,056 135 S7 12 . H Fig. 1. Cross Section of Sand Core Levee Showing Sequence of Construction Operations. are very slow in accumulating any growth andare thus left unprotected from scour and wavewash unless brush or tule mats are providedat considerable expense. .A heavy growth ofcotton wood, willow and black oak lines theriver throughout its length and it was to takeadvantage ot this natural protection to cur-rent and w-jve action that first s
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