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<br />I <br />I <br />I <br />I <br />t <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />sinkholes which reported to the outlet conduit during the dye flow <br />tests of November 1986, at'e believed to have initiated at one or <br />several of these weepholes or at other points of concentrated <br />leakage into the outlet. The weephole locations are described in <br />detail in the SRK report of May 1987 titled "Emergency Repair <br />Program As-Built Report, Gllrley Reservoir". <br /> <br />Much of the observed seepage into the outl et works tunnel <br />through the construction joints and weepholes was apparently <br />intercepted by the tunnel grouting program of April 1987. However, <br />some of the weepholes and construction joints, particularly those <br />in the lower, 20~ft long tunnel and in the downstream end of the <br />upper, 150-ft long tunnel, still leak considerably. The locations <br />and magni tude of the observed 1 eakage are descri bed in deta il in <br />Appendix H. <br /> <br />The 30-inch diameter, 17-ft long steel pipe section which lies <br />at the base of the tower and connects the upper and lower tunnel <br />segments appears to be in relatively good condition. Only limited <br />amounts of rust were noted on the inside of the pipe~ The bottom of <br />the pipe has not been visually evaluated to date due to the <br />presence of water and/or sediment. However, probing of the pipe <br />bottom by hand revealed no evi dence of pi pe damage or <br />deterioration. Two openings currently exist in the top of this pipe <br />section. The first is an old housing for the old and currently <br />inactive slide gate. The second is the 1.5 ft by 1~5 ft hole noted <br />immediately downstream of the old gate. This opening was made with <br />a cutting torch during the emergency repair program of April 1987 <br />and leads up into the gate house tower. <br /> <br />The 32-inch by 37-inch oval steel pipe appears to be in <br />relatively good condition although a coating of rust has developed <br />over much of its interior. The joints show little or no evidence of <br />leakage with the exception of the joint approximately 25 ft <br />downstream of the lower concrete-lined tunnel segment. This joint <br />was observed to be 1 eak i llg at the roof 1 i ne duri ng the June 11, <br />1987 inspection at approximately 0.5 gpm. <br /> <br />-13- <br />