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and flow direction differ from the typical gradient and southwesterly flow direction <br /> Because the water levels are significantly above the top of the monitoring well <br /> screens, these measurements are not representative of the aquifer conditions <br /> The regional groundwater is reported to flow towards the northwest Local <br /> ' pumping wells, recharge areas, or other artificial gradient influences may be the <br /> cause of the local southwesterly flow direction The tidal fluctuations of the Stockton <br /> Deep Water Channel have little influence on the groundwater beneath the Stockton <br /> Service Center and appear to have no effect on the groundwater gradient or flow <br /> direction at the site <br /> A step drawdown test conducted by Black & Veatch in March 1995 yielded <br /> transmissivity values ranging from 15 to 35 square feet per day (ft2/day) and an <br /> effective porosity of 0.25 Using the conservative transmissivlty value of 15 ft'/day, <br /> the aquifer is capable of sustaining a pumping rate of approximately 2 5 gallons per <br /> minute. <br /> 1 <br /> ' 96R7 East Bay Municipal Utility District <br /> 40429700 fcr 8 Final Closure Report <br />