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APPENDIX C <br /> PURGE VOLUME CALCULATIONS <br /> Ralph's Square <br /> 404 Aldo Avenue, Santa Clara, California <br /> Purge Calculations: <br /> 1. Tubing (0.25" OD, 0.17" ID) <br /> a. length of tubing = 8 ft(96 in) <br /> b. volume=nr2h <br /> r=1D/2 0.085 in <br /> 7u(0.0851)96= 2.18 in' <br /> lin'=16.4ml 35.72 ml <br /> 2. Volume of sand pack and dry bentonite (4" OD, 0.25" ID) <br /> a. height(length) = 1 ft (12 in) <br /> b. Outer vol=total vol-inner vol 4"-0.25" = 3.75" <br /> c. estimated air space in sand =30% <br /> d. VT=7rrzh <br /> r=3.75/2 1.875 in <br /> 7r(22)12= 132.47 in' <br /> lin'=16.4mi 2,172.49 ml <br /> 30% of VT 651.75 m <br /> Volume Formula: <br /> A= #of purge volumes 1 <br /> B= volume of tubing 35.72 ml <br /> C= volume of well 0.00 ml <br /> D= volume of sand pack 651.75 ml <br /> E= total volume to be purged <br /> E=A(B+C+D) <br /> E= 1(22.32+741.54) <br /> Total volume to be purged= 687.46 ml <br />