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' Where _ <br /> K = hydraulic conductivity (ft/day) <br /> r = the inside radius of the riser pipe or screen <br /> To = the basic lag time, as described above <br /> ' L = the length of the screened section below the water table <br /> R = the effective radius of the screen <br /> = [r2 + p(iw2 - r)]1!2 <br /> ' p = the porosity of the sandpack <br /> rw = the radius of the sandpack <br /> Based on the provided calculations, a 10 gallon per minute (gpm) flow rate <br /> was determined to be appropriate for the Stockton site With this flow rate, the <br /> aquifer will not be drawn down over 50010 of the aquifer's thickness (estimated as <br /> ' being approximately 12 feet), and the estimated radius of influence will be <br /> approximately 30 feet per well It should be noted that these estimates are based <br /> off slug test data, and as pumping begins, a pump test should be performed in <br /> ' order to refine the pumping rates <br /> The aquifer appears to be semi-confined with clay on the bottom and silty <br /> clay on top The aquifer itself is made up of silty sand, with a typical porosity of <br /> ' 0 30 Based on the regional geology, it has been assumed that no boundary <br /> conditions or substantial recharge areas exist within 1000 feet of the site <br /> 1 <br /> 1 <br /> 1 <br /> 94RS East Bay Municipal Utility Btstnu <br /> 40429600\slugdata ? Stockton Service Center- Remediation <br />