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APPENDIX B -- SLUG TEST CALCULATIONS <br /> ' ALCULATTON <br /> C OF HYDRAULIC CONDUCTIVITY <br /> First groundwater at the Art & Artists site occurs in a downward-coarsening sand body that <br /> ' is present at approximately 60 feet below ground surface. This sand body is considered to <br /> be an unconfined water-table aquifer. Model 18 of Dawson and Istok (1991) was used to <br /> calculate the hydraulic conductivity of this aquifer. In this model, the hydraulic conductivity <br /> ' can be computed using the following equation: <br /> K = r Z In rw). where <br /> 2(1-d)tL) <br /> ' r. is the effective radius of the well casing <br /> r,, is the borehole radius <br /> R is the radius of influence of the well <br /> I is the distance from the static water table to the bottom of the casing <br /> d is the distance from the static water table to the top of the screen interval <br /> tL is the time lag <br /> ' Furthermore, r,,2 = r; x (1 - gyp) + 4)ro2, where <br /> r; is the inside radius of the well screen <br /> % is the outside radius of filter material <br /> ¢ is the porosity <br /> and ln(iyrw) = 1.1 + A + B(ln[m-1)/r,,))-1 <br /> ln(1/rw) (1-d)/rw where <br /> m is the thickness of the aquifer <br /> A and B are empirically determined dimensionless coefficients that are functions of <br /> ' I-d/rw <br /> and tL is determined from the graph of HIM vs. T or calculated according to: <br /> tL t1 - 12 <br /> In(Hw4L)1 - ln(H./Ho)2 <br />' Calculations for each test are given on the following pages. <br /> (iasb�eal Asda Saniu�Le <br /> A&A PRPR•M.4J <br />