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19 <br />• Tests performed for the determination of the above aquifer character- <br />istics include the following. Results from the recovery test are probably <br />the most reliable. <br />a. Sluq Test - This involved submerging a closed cylinder of <br />known volume into the well over a time period sufficiently short to be <br />considered an instantaneous injection. Before initiating the test the <br />statlc level in the well was recorded. The residual buildup of piezo- <br />metric head was then observed in the injection well itself at selected <br />intervals of time until the test was completed. <br />b. Drawdown Test - Immediately before starting the pump, the water <br />levels in the observation wells and in the pumped well were measured to <br />determine the static water levels upon which all drawdowns were based. <br />• The instant of starting the pump was recorded as the zero time of the <br />test. If the initial discharge was in excess of the continuous discharge, <br />the valve in the discharge pipe was then adjusted so as to maintain the <br />discharge as constant as possible throughout the test period. Water <br />levels in the observation wells and pumping well were measured at selected <br />intervals of time until completion of the test. <br />c. Reccvery Test - When the pump was stopped after running the <br />drawdown test, the drawdown and time at which it was shut down were <br />recorded. Measurement of water level was immediately initiated in the <br />pumped well and in the observation wells where appropriate. The same <br />procedure and time pattern was followed as at the beginning of the draw- <br />down test. As in the drawdown test, the time and water level are recorded <br />for each measurement. <br />For the slug test analysis, the residual buildup in well 116 was <br />plotted on coordinate paper against the corresponding values of 1/t as <br />shown in Figure 10. Note the line must pass through the origin, a point <br /> <br /> <br /> <br />