Prototype measurements included butterfly valve leaf pressure fluctuations, butterfly valve leaf vibrations, intake conduit pressures, wet well pressures, elbow piezometer differential pressures, air vent, air flow, and wet well water temperatures. Data were recorded on analog magnetic tape and played back on oscillograph charts to verify the recording. Results of the data reduction indicate that the air flow in the quality control (QC) gate air vent reached peak flows at two different QC gate openings (5 and 90 percent), similar to results obtained in other field testing. The elbow piezometer pressures from the intake conduits and the wet well appeared to be adequate for use in discharge determination. However, it is recommended that a more precise calibration be performed and permanent instrumentation be installed for monitoring discharges. Surges in the wet well were found to be at a maximum (6.14 ft) during single-valve operations with small butterfly valve openings and large QC gate openings. These butterfly valve and QC gate combinations created unsubmerged flow at the butterfly valve. The most turbulent pressures ( -17.82 ft) and increasing the potential for the occurrence of cavitation low pressures area. Multilevel intake port operation (blending) is considered to be possible as well as potentially practical in the operation of the structure. There was general agreement between the observed and predicted release temperatures. (fr).