File:Pacific Gas and Electric magazine (1912) (14783669082).jpg

Identifier: pacificgaselectr41913paci (find matches)
Title: Pacific Gas and Electric magazine
Year: 1909 (1900s)
Authors: Pacific Gas and Electric Company
Subjects: Pacific Gas and Electric Company Electric utilities Public utilities
Publisher: (San Francisco, Calif.) : Pacific Gas and Electric Co.
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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gh asthe floor level, showing that the bed rockpitched off more than sixteen feet, within adistance of about forty feet, at this point.Bringing this corner back so far made the the glacial period. This hill like the slatyformation on the other side rose very precipi-tously from a point close to the waters edge.About 50,000 yards had to be excavatedand removed before the bed rock was clearedand ready to receive the buildings founda-tions. First a large portion was removed by meansof the hydraulic monitor a relic of the earlyplacer mines, the operation of which wasdescribed in an earlier issue of this magazine. It was found impossible to move all thematerial by this means, however, as many ofthe boulders encountered were of such sizethat the monitor, working under the availablehead of 200 feet, was unable to move them.One can readily understand why, when it isstated that the largest of these weighed ap-proximately 150 tons. Therefore, after the 377 (jBki Pacific Service Magazine i£!9Ai
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Portal of Tnnnel No. 1 at power Ijoase site monitor had removed all the surface material This was accomplished by running the tracks and all other that it was capable of handling, for the dump cars along the same side of the a large force of miners and about two car river as the power house and on a slight down loads of powder were employed, and the grade from its floor level. They were carried moraine, which consisted of a very hard ce- on rough trestles, built from timber, cut in mented mixture of sand rock and gravel, the immediate vicinity. The cars were run much like a natural concrete, was gradually out on these trestles and dumped from either blasted away. The material was shoveled side until the dump was raised to the level into push cars each of which was propelled of the track. The tracks were extended as to the dump by two men. Side dump cars, the dump grew until they ran to a distance of built on the job, were used. They simplyconsisted of two pairs of t\velve-inch wheelsw

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