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MICAMA <br /> . Working To Restore Nature <br /> Conclusions <br /> The analyses of pumping test data from the site yields the following conclusions <br /> o The water-bearing zone from approximately 55 to 75 feet below grade is <br /> heterogeneous, anisotropic, and unconfined <br /> o The transmissivity of this zone is approximately 0 4 to 0 8 ft2/min and the specific <br /> yield is approximately 5 to 10 percent <br /> o The production well exhibited non-linear head losses resulting in a low to moderate <br /> efficiency A significant portion of this loss occurred because the well is screened <br /> over a relatively small interval resulting in steep vertical gradients near the wellbore <br /> and a pronounced partial penetration effect Due to the need to confine withdrawal <br /> to a short distance below first water, these effects are difficult to overcome <br /> However, it 1s likely that the majority of well production is coming from the sandy <br /> portions of the section and slot sizes should be selected accordingly This could <br /> result in the production of some fines during pumping which would necessitate some <br /> surface filtration <br /> o The limit of capture zone downgradient of this pumping test well 1s 18 feet <br /> • <br /> 38032-10 <br />