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<br />1 <br /> <br />1 <br /> <br />I <br /> <br />I <br /> <br />1 <br /> <br />1 <br /> <br />I <br /> <br />I <br /> <br />1 <br /> <br />1 <br /> <br />1 <br /> <br />1 <br /> <br />1 <br /> <br />1 <br /> <br />1 <br /> <br />1 <br /> <br />I <br /> <br />I <br /> <br />1 <br /> <br />-2- <br /> <br />above the dlllll, we are of the opinion that this spillwey is of <br />.lllIIple capacity snd we doubt if it will ever be necessary to use <br />the saJlle. The inner balf of the dam was supposed to have been <br />buil t entirely of cley the :full height of the dam, whUe the out <br />or down-stream haJ.t' of the dam wa.s largely bull. t of a d'ecomposed <br /> <br />sha.l.e and c1.~ wb,1.ch 1.s not impervious. <br />"' ., . .. ..:.", .,', ."c: ,,:':,.~t<:_.):\:r..:~.,\-'~:~::)-:~;;' .."-: <br />Worle" on th1s' d8m" was b.~~..1n.':t~~ <br /> <br />continued in December of that year and again <br /> <br />~~i: 'Of;9ii';'~ttf~:iA'\ <br /> <br />taken up the following <br /> <br />summer and completed in 1912. The writer is informed by the resident <br /> <br /> <br />engineer I J.!r. R1chardson, that the plsns provided for a puddJ.e trench <br /> <br />to be looated a short dista.nce below the upper tow of the dam. This <br /> <br />puddJ.e trench Was six f~t on the bottom a.nd extended down to hard <br /> <br />shale as shown by borings along the axis of the dlllll, which was found <br /> <br />to axist under the entire structure. OVerlying the sbale and fonning <br /> <br />the immediate 'foundation of the dam is a sort of grey, sbaley cla;r. <br /> <br />Ax> rosS the site of this dlll!I is a.n old channel of one of the streams <br /> <br />leading down from the foothills which.ha~deposit.ed above ~he.sbale <br />. ...'. -,;:' ."..., "',:':"'-:;';""-;';'. ,". - -. <br />in the erosion" pf the e~~t more;"<?r 1.e~s,,~an~d:t:_~ra.ve;_',.~4.'-c.ob))l.e~'}'::;. <br />, -'. . .' -, , ' ':::.':": ,,)-., ".-,:,.:': ......-,..:'...'. -"-,', ," . <br />rook. We are informed that the puddJ.e trenoh, above referred to, <br />Was carried down to the hard sbale and hence was supposed to prevent <br />any seepage through the porous material under the dam formed by <br />the stream channel. <br /> <br />The plans provided for the stripping .snd clearing off <br /> <br />of that portion of the dlll!I foundation 40 feet in width extending <br /> <br />from the puddJ.e trench toward the center of the dem, The writer is <br /> <br /> <br />informed by the engineer on the work that this provision was carried <br /> <br />out; sJ.so that the rsma1n1ng portion of the surfe.oe of the foundation <br /> <br />I <br />, <br />! <br />