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t+ Results of Groundwater Pumping Tests - 152 East 11th Street, Tracy Page 16 porosity of 0 5 that is typical of silty clays (Freeze and Cherry, 1979) an upper-bound estimate for groundwater velocity close to the water table is Average Linear Downgradient Groundwater Velocity= 0 031 ft /day SUMMARY Based on the analysis of the results of the groundwater test conducted at the 152 East 11th, Street site on December 28th 1993 and January 18th 1994, the following hydrogeologic parameters have been derived Transmissivity of Strata within 25 ft of the Ground Surface = 4,324 gpd/ft Horizontal Hydraulic Conductivity of Silty Clays = 1 7 x 10--3 cm/sec at and Below the Depth of the Water Table (Upper-bound Estimate) Average Linear Downgradient Groundwater Velocity = 0 031 ft /day (Upper-bound Estimate) [N.B. The values of hydrogeologic variables that are given above are, in each case, intended to be conservative in the context in which they are presented They should not be used for other purposes, including the functional design of remediation systems or making detailed estimates of derived geohydraulic parameters, except by qualified engineers and after reading the whole of this report ] REFERENCES Cooper, H H , and C E Jacob 1946 A generalized graphical method for evaluating formation constants and summarizing well field history Transactions, American Geophysical Union, Vol 27, No 4 Driscoll, F G 1986 Groundwater and Wells 2nd Ed Johnson Division, St Paul, Minnesota Freeze, R A , and J A Cherry 1979 Groundwater Prentice-Hall Inc , Englewood Cliffs, New Jersey Schafer, D C 1978 Casing storage effect can affect pumping test data. Johnson Drillers' Journal Third Quarter Johnson Division, St Paul, Minnesota Terzaghi, K and R D Peck 1967 Soil Mechanics in Engineering Practice 2nd Ed John Wiley & Sons Inc New York, New York