Engineering and Contracting . ng the grout down into the pipe was refilled about every 10 minutesuntil the hole would take no more. The ap-paratus was then removed and a cap wasscrewed on the tube in the grouted a given length of ditch was groutedin this way, and sufficient time had elapsed toallow the grout to set, test holes were boredwithin the grouted area and the process wascontinued until there was no indication ofv/ater flow below the bottom. The greaterpart of the bottom was grouted successfullyin this way, but, as explained later, the grout-ing scheme was aband
Engineering and Contracting . ng the grout down into the pipe was refilled about every 10 minutesuntil the hole would take no more. The ap-paratus was then removed and a cap wasscrewed on the tube in the grouted a given length of ditch was groutedin this way, and sufficient time had elapsed toallow the grout to set, test holes were boredwithin the grouted area and the process wascontinued until there was no indication ofv/ater flow below the bottom. The greaterpart of the bottom was grouted successfullyin this way, but, as explained later, the grout-ing scheme was abandoned where the core-wall ditch entered the side-hills. HANDLING FLOW FROM SEAMS. At the east end three large vertical opencrevices were uncovered. The flow fromthese was so considerable that it was neces-sary to put in a force pump with a 4-in. suc-tion and a 3-in. discharge, in order to keepthe ditch clear. As the grouting method, aftercontinued trials, did not give satisfaction atthis end, it was decided to take up the bot-. Fig. 5. Secoryd Method of Handling Water inCove Wall Ditch. torn until the principal water strata werereached. This was done, and concrete wasplaced in the ditch, all the walls being plas-tered first with a rich cement mortar workedin with trowels. Two coats of plaster wereapplied on the north or reservoir side andone on the south side. The suction pipe ofthe pump was built in concrete, and carriedup with the wall. The strong flow of waterin this section of the ditch made it difiicultto place the concrete for the core-wall with- Tune, 10, 1914. Engineering and Contracting 675 out having the cement washed out before itset. At first, the method indicated in the sketch,Fig. 4, was tried, namely, a line of 1-in. sheet-ing was placed as shown, and clay wasrammed between the sheeting and the rockto stop the water flow. Concrete was placedbetween the sheeting which was raised grad-ually as the concrete was carried up. This•did not prove wholly satisfactorv, an
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