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Aquifer Testing Work Plan • Former rth Bro Facility ' Stoc North Broadway Avenue - Stockton,California Sierra-Pacific Project No. 94-055.05 ' stripped from the data, and the pre-processed readings will be converted to a tab-delimited text file format in Excel,which will then be imported into the Aqtesolv®software,authored by Hydrosolve,Inc. ' of Reston, Virginia. Transmissivity and storage coefficient data will be calculated using the Aqtesolv software. Additionally, ' the same data will be imported into the Surfer®for Windows software, authored by Golden Software, Inc.of Golden,Colorado. Ground water contours and cones of depression will be modeled using Surfer ' for Windows for the aquifer tests. ' Mathematical relationships and equations used to estimate the hydraulic conductivity and transmissivity of sediments are founded on several assumptions. Some of the hydrogeologic assumptions required to perform mathematic aquifer analyses are paraphrased as follows from Groundwater and Wells(Driscoll, 1986,p. 214). These hydrogeologic factors relate to natural subsurface conditions at the subject site. To accommodate the mathematics of a formal aquifer test, water-bearing materials should have a ' uniform hydraulic conductivity within the radius of influence of the wells. Alluvial formations beneath the Broadway site are heterogenous (different) when observed or measured at a large scale,(close-in). ' When these formations are observed or measured at a small scale (over a broad area), the alluvial formations are more uniform. The instrumented observation wells will be installed to encompass a ' broad area of the subject aquifer and thereby minimize the effect of geologic heterogeneity. The aquifer should not be stratified, and the saturated thickness should be constant, before pumping starts. The ' aquifer should exhibit laminarf ow throughout the aquifer within the radius of inf uence ofthe pumping ' well. The aquifer at the Broadway site, although stratified, is generally uniform in saturated thickness. ' To accommodate the mathematics of a formal aquifer test, the pumping well is supposed to be perfectly efficient, and draw-down levels inside and just outside the well bore are assumed to be at the same elevation during the tests. The screened interval of the pumping well is supposed to penetrate the entire aquifer. The well will penetrate the entire aquifer, but due to the spatial distribution of small ' SIERRA-PACIFIC GROUP 13 1