APPENDIX T.


 ESTIMATES OF COST OF LOCK CANAL.

 [Supplemental to the minority report.]



Breakwaters in Limon Bay (length 41 miles), from mile 0 to mile 3.30, using the estimate
 adopted by the Board-------.-.--------------------------------------------------------$5, 000, 000
Extension of breakwater, 11 miles in length, from mile 3.30 to head of Limon Bay (mile
 4.55), 400,000 cubic yards, at 75 cents-------------------------------------------------------300, 000
Excavation of channel in Limon Bay, 40 feet in depth below low water and 500 feet wide,
 from mile 0 to mile 4.55:
 Earth (dredging), 8,300,000 cubic yards, at 15 cents....------------------------------------------1, 245, 000
Excavation 40 feet in depth below low water and 500 feet wide from head of Limon Bay
 (mile 4.55) to northerly end of Gatun locks (mile 7.15):
 Earth (dredging), 10,000,000 cubic yards, at 25 cents------------------------------... $2, 500, 000
 Indurated clay (dredging), 2,030,000 cubic yards, at 70 cents------------------------... 1, 421, 000
 3, 921, 000
Excavation for Gatun locks, mile 7.15 to mile 7.74:
 Earth, 920,000 cubic yards, at 40 cents...---------------------------------------------368, 000
 Indurated clay, 2,740,000 cubic yards, at 70 cents. ..----------------------------------1, 918, 000
 2,286,000
Gatun locks exclusive of excavation and approach walls------------------------------ . .----... 13, 075, 000
Approach walls of Gatun locks ------------------------------------------------------------------ 500,1000
Backfilling and embankment, Gatun locks, 660,000 cubic yards of borrowed earth, at 50 cents-----------. .330, 000
Gatun dam:
 Earth embankmentBelow elevation 50, 12,170,000 cubic yards of dredged material pumped into dam, at
 20 cents. . . ..------------------------------------------------------------$2, 434, 000
 Between elevation 50 and elevation 80, 5,770,000 cubic yards of dredged material
 pumped into dam, at 30 cents..-------------------------------------------1, 731, 000
 Above elevation 80, 3,260,000 cubic yards of material from excavations placed in
 dam, at 25 cents. ....-------------------------------------------------------815, 000
 Excavation for diversion channel and regulating worksEarth, 1,100,000 cubic yards, at 40 cents..---------------------------------------440, 000
 Indurated clay, 480,000 cubic yards, at 70 cents.---------------------------------336, 000
 Concrete in regulating works and for protection of diversion channel, 189,000 cubic
 yards, at $8. .. ..-------------------------------------------------------------1, 512, 000
 Regulating gates and machinery (complete).----------------------------------------320, 000
 Allowance for preparatory work at site of Gatun dam and miscellaneous expenses ...... 200, 000

 Total for Gatun dam.....---------------------------------------------------------------7, 788, 000
Excavation from Gatun locks (mile 7.74) to Obispo (mile 31.25), making channel 45 feet
 deep and not less than 500 feet wide for 23.51 miles, of which 15.92 miles is not less
 than 1,000 feet wide:
 Earth excavation in the dry, 600,000 cubic yards, at 40 cents-------------------------$240, 000
 Indurated clay excavation at Gatun, 130,000 cubic yards, at 70 cents------------------91, 000
 Earth excavation (dredging), 12,960,000 cubic yards, at 25 cents.---------------------3, 240, 000
 Rock excavation in the dry, 1,160,000 cubic yards, at $1.15-------------------------.. 1, 334, 000
 4,905,000
Cutting trees in Gatun Lake.....-------------------------------------------------------------------100, 000
Excavation from mile 31.25 to mile 32.80, channel 45 feet deep and 300 feet wide, with slopes
 of 10 vertical to 1 horizontal:
 7,280,000 cubic yards, at 80 cents. ...----------------------------------------------$5, 824, 000


4619i-5 A-06 -38


425