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KL.EINFELDER <br /> 2 PILOT TEST RESULTS AND ANALYSIS <br /> 2.1 BUBBLE FLUX TESTING <br /> During operation of the shallow sparge well, the initial inflection of sparge air was measured in <br /> MW -1, which is located 15 feet from the sparge well (see Plate 2). This test involved lowering <br /> a capture tube into the monitoring well and measuring the deepest point at which air is detected <br /> entering into the screen of the well with a small rotometer (see Plate 4 for estimated sparge path <br /> illustration). This inflection points was used to trace the outermost path of sparge air to estimate <br /> the radius of influence for active stripping of the well. The leading path of sparge air through <br /> groundwater travels in a generally parabolic shape according to the following equation: <br /> yp <br /> = ds — ].2 <br /> where: <br /> i yp= depth of leading front sparge path <br /> ds=depth of the sparge point below grade surface <br /> r=lateral distance from the sparge well <br /> k= sparge path shape constant <br /> i <br /> The unknown in the equation is the shape constant k, which is dependent on subsurface <br /> ` conditions and unique for every site. The objective of the bubble flux test is to determine the <br /> deepest(initial) inflection point of sparge air in MW-1 to estimate the shape constant. The shape <br /> constant can then be used to extrapolate the radius of influence of each well nest. Rearranging <br /> 1 the previous equation to solve for k: <br /> k = ds yp <br /> r2 <br /> i <br /> 122801SAC2R566 Page 3 of 9 November 25,2002 <br /> Copyright 2002 Kleinfelder,Inc. <br /> I <br />