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0 The transmissivity of this zone is approximately 1 to fel min and the <br /> specific yield is approximately 1 to 3 percent <br /> o The production well exhibited negligible non-linear head losses suggesting a high <br /> efficiency and proper design <br /> o The groundwater gradient at the site is highly irregular and has shifted in both magrutude <br /> and direction Therefore calculation of a steady state capture zone is not valid For <br /> purposes of evaluating remediation feasibility an extremely conservative approach <br /> (greatly underestimates potential capture zone) is to use the steepest observed gradient <br /> moving away from the tank area which yields an estimated limit of the steady-state <br /> capture zone downgradient of RW-1 of 12 feet for a pumping rate of 3 5 gpm It is <br /> likely that the gradient direction reversals observed at the site over four separate <br /> monitoring events result in an average annual gradient that is relatively flat. This would <br /> result in a much larger potential capture zone. Longer term static monitoring at the site <br /> would be needed to define the capture zone more precisely <br />