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An initial run was made with the sonic tool without stabilizers, i.e., the tool was pulled along the bottan of the outlet pipe. The tool became stuck 27 feet frcm the upstream end of the outlet pipe. The tool was retrieved, stabilizers were placej on it (which raised it approximately 3 inches off the bottan of the outllet pipe) and another logging run was made wi thout obstruction to the tool. The seoond tool used was the <xmbination tool, i.e., ganma, garrma-garrma an:J caliper. Since this tool must remain in contact with the bottan of the outlet pipe, it was oot possible 1:0 utilize stabilizers. The tool became stuck at 27 feet fran the upstream end of the outlet- pipe. The tool was renoved, and the remaining 27 feet: were logged separately fran the upstream end. The third, and final, tool used was the neutron log. As with the cx:mbination tool, it was not p:>ssible to utilize stabilizers. The too~ became stuck at 27 feet frcm the upstream end of the outlet pipe, and therefore the remaining 27 feet were logged separately fran the upstream end. During the neutron logging, the downstream end of the outlet pipe was damned to increase the depth of water in the outlet pipe. All logging information was recorded on magnetic tape for o:::mputer processing. An analog recording o:E each log was made in the field to ascertain that the desired results were being obtained. A ropy of the logs is included with this rep:>rt. RESULTS The results of the logging performed in the Southside Reser'llOir outlet pipe are presented in this section. A surrmary of interpreted logging data is presented in Table 1. SCNIC :ux; The average exmpressional wave velocity for sound roncrete, such as concrete used in caisson or drill hole cementing operations ranges frcm U,OOO to 18,000 feet per second. 'rhe average velocity for steel casing ranges fran 19,500 to 20,700 feet per second. The a:.rrpressional wave -3-