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�''" r -. � L - - -.+"� ='�� 'ams - ''�'`.-'� -•�.,€ '''� � tt: - -�-�'` fu ws - s ' ,+ .: <br /> i <br /> r f <br /> MAR 05 '68 20:27 EMCELTECH/SF P 5 <br /> Kayo Oil Company EXCILTECH March 5, 1988 <br /> Project No. 1813G Page 3 <br /> JH9DDL= <br /> x <br /> F The sluff test Is a procedure for deriving the hydraulic conductivity of an <br /> i € aquifer in the immediate vicinity of a well from the rate of rise of the ground- <br /> water level In the well after a certain volume of water is removed. <br /> # Essentially, instantaneous lowering of the water level in the well can be <br /> achieved by partially or completely submerging an object in the water, <br /> allowing the water level to reach equilibrium in response to Insertion of the <br /> object, and then quickly removing the object. Rising water levels are then <br /> measured at specific time Intervals, which are then plotted against time to <br /> ryx determine the hydraulic conductivity of the geologic materials comprising the <br /> aquifer. <br /> Exceltech's technical approach to this study involved selecting a slug test <br /> k model that would closely approximate the Installation details and geometry of <br /> the wells completed in the unconfined aquifer, Further, it was necessary that <br /> the model assume that the wells installed In the unconfined aquifer completely <br /> penetrate the aquifer's thickness, and that ground-water levels in each well <br /> occur below the top of the screened Interval. Exceltech selected the slug test <br /> method derived by -Bouwer and Rice (1976), which determines the hydraulic <br /> conductivity of unconfined aquifers with completely or partially penetrating <br /> wells, with ground-water levels at or below the top of the well's screened <br /> intervals. Only the, hydraulic conductivity of the unconfined aquifer within the <br /> effective radius of the wells Is determined by this method. The effective <br /> radius of the well Is a function of the vertical distance between the water <br /> level in the well after the slug in the well is Instantaneously removed, and the <br /> A.uifer <br /> equilibrium ground water surface In the unconfined a rn <br /> q complete <br /> r <br /> description of the method, Including theory and comparison with other methods, <br /> f t------Is--available-in-the-reference,- - ---- - - - - - - <br /> At each test well, rising water levels respond to Instantaneous removal. of the <br /> s ' <br /> t slug were measured utilizing a downhole pressure transducer coupled to an <br /> electronic programmable data collection unit at ground surface. Input from the <br /> transducer to the data acllooticn unit was transferred to an IBM compatible PC <br /> � . . <br /> 4 <br />