Laserfiche WebLink
I <br /> AQUT ER CHARACTERISTICS <br /> The following aquifer parameters were derived from pumping test data and other field work performed at the <br /> Douglas Gass Station located at 940 South Cherokee Lane in Lodi, California. <br /> Jacob Approximation Method (Cooper and Jacob, 1546) <br /> Transmissivi <br /> (1) T <br /> As <br /> where T = Transmissivity (gallons per day per foot,gpd/ft.) <br /> Q = Productivity Rate(gallons per minute) <br /> e s = Change in drawdown or residual drawdown per 1 log cycle of time (ft.) ' <br /> H draulic Conductivi <br /> (2) K = T <br /> b <br /> where K = Hydraulic Conductivity(gallons per day per square foot, gpd/ft') <br /> T = Transmissivity (gpd/ft.) <br /> b = Aquifer Thickness (ft.) = approximately 16 ft. <br /> The following values were obtained from the corrected drawdown curve of recovery well RW-1 (Appendix B, <br /> page B-2): <br /> Q = 4.0 gpm <br /> as = 5.51 ft. <br /> ' Therefore ecaation (1) becomes: <br /> T = 264 (4L4gilt2) = 191.6 gpd/ft. <br /> 5.51 ft. <br /> Equation (2) becomes: <br /> K = 191.6 end/ft_ = 11.97 gpd/ft.= <br /> 16 ft. <br /> The following values were obtained from the recovery curve of well RW-1 (Appendix B, page B-3): <br /> Q = 4.0 gpm <br /> A s = 6.76 ft. <br /> (assume b = 16 ft.) <br /> Therefore: <br /> "' T 15-6,2-gpd/ft._ -- --- -- <br /> - r K = 9.76 gpd/ft= -- -- -- -- - - -- --- -_ <br /> Du font Environmental Services <br /> c-I <br />