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APPENDIX R R.

IMPROVEMENTS OF RIVERS AND HARBORS IN THE LOS ANGELAS,

CALIFORNIA, DISTRICT.

REPORT OF LIEUT. CHAS. T. LEEDS, CORPS OF ENGINEERS, OFFICER

IN CHARGE, FOR THE FISCAL YEAR ENDING JUNE 30, 1910.

IMPROVEMENTS.

1. San Diego Harbor, California.
2. Deep-water harbor at San Pedro

Bay, California.

3. Wilmington Harbor, California.
4. Los Angeles Harbor, California.
5. San Luis Obispo Harbor, California.

UNITED STATES ENGINEER OFFICE,

Los Angeles, Cal., July 15, 1910. Sir: I have the honor to forward herewith annual report on works of river and harbor improvement in my charge for the fiscal year ending June 30, 1910. Very respectfully, your obedient servant,

Chas. T. LEEDS,

First Lieut., Corps of Engineers. The CHIEF OF ENGINEERS, U. S. ARMY.

RR 1.

IMPROVEMENT OF SAN DIEGO HARBOR, CALIFORNIA.

With an allotment of $30,000 from appropriation made by river and harbor act of March 3, 1909, 100,904 cubic yards of material, at $0.2874 per yard, was dredged in the channel through the outer bar under contract with the California Reclamation Company dated July 6, 1909. Work began November 29, 1909, and was completed January 17, 1910. A channel 200 feet wide and 29 to 30 feet deep was dredged through the bar.

The river and harbor act of June 25, 1910, has appropriated $125,000 for deepening and widening the channel through the outer bar and the middle ground just within the harbor.

APPROPRIATIONS.
Previous to December 31, 1902.
March 3, 1903.
March 3, 1905-
March 2, 1907
March 3, 1909
June 25, 1910_
Repayment

$432, 500.00 192, 850.00 10, 000.00 20, 000.00

30, 000.00 125, 000.00

3. 26

Total..

810, 353, 26

CONTRACTS IN FORCE.

CONTRACT FOR DREDGING ON OUTER BAR.

Name of contractor: California Reclamation Company.
Contract entered into July 6, 1909; approved July 31, 1909.
Worki to begin October 4, 1909; contract to be completed August 7, 1910.
Work was completed January 17, 1910.

One hundred thousand nine hundred and four cubic yards of material was dredged, at $0.2874 per yard.

COMMERCIAL STATISTICS.

[Furnished by the collector of customs at San Diego, Cal.)

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DEEP-WATER HARBOR AT SAN PEDRO BAY, CALIFORNIA. The construction of the breakwater was continued during the year, under continuing contract dated June 7, 1900, with the California Construction Company, of San Francisco, Cal.

At the beginning of the fiscal year 2,204,909 tons of stone had been deposited in the substructure, which had been raised to mean lower low water and was about completed for the length of 9,174 feet from its westerly end, and 222,038 tons had been placed in the superstructure. The amount of superstructure work done was the equivalent of 8,458 feet of completed wall.

During the fiscal year ending June 30, 1910, 25,993 tons of granite was placed in the substructure, at a cost of $0.844 per ton, and 7,233

tons of granite in the superstructure, at a cost of $3.10 per ton, and 1,034 tons of granite was placed as a berm at the toe of the ocean slope of the superstructure, at a cost of $2 per ton. A concrete block 40 feet square and 20 feet high, beginning 3 feet below low water, was built at the outer end of the breakwater, at a cost of $6,930. The stubstructure was completed. The superstructure was about 99 per cent completed.

Further work is provided for under appropriation for improving Los Angeles Harbor.

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Name of contactor: California Construction Company.
Contract entered into June 7, 1900; approved June 27, 1900.
Work to begin August 4, 1900; contract to be completed March 31, 1907.

Contract extended for reasonable period.
Rates :
For substructure stone, per ton of 2,240 pounds.-

$0.844 For superstructure stone, per ton of 2,240 pounds.

3. 10 For concrete, per cubic yard.

6.00 Quantities (estimated): Stone in substructure

_tons.- 2, 210, 958 Stone in superstructure -

--do---- 242, 400

Total

-do---- 2, 453, 358 Concrete

-cubic yards. 2, 370 Total consideration of contract (approximate), $2,648,046.05.

SUPPLEMENTAL CONTRACT.

Name of contactor: California Construction Company.
Contract entered into November 24, 1909; approved June 11, 1910.

Provides for the extension of the stone superstructure to the westerly end of the breakwater in lieu of the construction of concrete block.

COMMERCIAL STATISTICS FOR YEAR ENDING DECEMBER 31, 1909.

For commercial statistics, see report of Wilmington Harbor, California.

RR 3.

IMPROVEMENT OF WILMINGTON HARBOR, CALIFORNIA. Dredging with government dredge.—The dredge San Pedro was employed during most of the year in dredging in the turning basin. This work was completed June 25, 1910, when the dredge was moved to the Crescent wharf, and dredged out a lump which had caved from the side slope under the wharf. On June 27 the dredge was moved to a point in the entrance channel near Deadmans Island, where it was in operation at the close of the fiscal year. All dredging was carried to a depth of 25.5 feet below mean lower low water. A total of 885,298 cubic yards was dredged from 7,051 linear feet of cut approximately 200 feet wide, and varying from 5 to 29 feet in depth. This material was wasted as follows:

Cubic yards. Pumped 995 to 2,383 feet and wasted on Smiths Island and tide lands north and west of the island.-

557, 141 Pumped 1,830 to 2,556 feet and wasted on San Pedro, Los Angeles and Salt

Lake Railroad Company's concession south of Terminal bath house.. 50,000 Pumped 1,575 to 2,408 feet and wasted into ocean opposite station 147-- 264, 880 Pumped 521 feet and wasted against bulkhead opposite station 121. 2, 166 Pumped 680 feet and wasted over jetty north of Deadmans Island opposite station 561

11, 111 Total..

885, 298 The material removed from the turning basin consisted of quicksand, hardpan, shell, and blue clay; the hardpan, principally on the east side, was 5 to 7 feet thick, and in the bottom cut. A large percentage of disintegrated shell was found all over the basin and was particularly hard to handle, as it persistently clogged the discharge pipe. The material encountered near Deadmans Island was quicksand, some shell, and a large percentage of bowlders from 5 to 100 pounds in weight.

The following statement shows the distribution of time for the dredge during the year:

H. M. Moving and placing plant-

343 45 Actual pumping-

5, 393 45 Repairs

746 50 Time lost passing vessels.

6 15 Cleaning suction.

67 30 Advancing

625 30 Not working (52 Sundays and 13 holidays, etc.).

1,576 25

Total--

8, 760 00 The following statement shows the cost of dredging during the year: Superintendence and office work..

$2,704. 79 Care of plant, labor---

1,080.00 Surveys, labor.

184. 00 Towage and dispatch work, labor, supplies, and hire of launch.

1, 090.94 Alterations and repairs to dredge and attendant plant, labor, and supplies

6, 893. 50 Operating dredge, superintendence, labor charges, fuel, fresh water, lubricants, and other supplies

46, 649. 02 Deterioration of plant and property during fiscal year..

10, 757. 77 Total cost of dredging

69, 360.02 Amount of material removed.

_cubic yards.- 885, 298 Cost per cubic yard.

$0.078

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