ARCHIVED REPORTS XR0009475 - Laserfiche WebLink

Home Browse Search

i Pilot Testing Report and Conceptual Corrective Action Plan July 15, 1994 Manna Pro, 4004 South EI Dorado, Stockton, CA 14 ' 513 Results Before analyzing the drawdown data, the values were compared to background water level trends ' occurring at the site before the pumping testing program As shown on the transducer hydrograph for well EW-1 (Appendix D), there were no significant fluctuations in groundwater levels in the data before the test started A flow rate of 1 3 gpm was maintained during the 3-day aquifer test This average rate was maintained throughout the aquifer test and was used in subsequent data analysis After 2,870 minutes of pumping at 1 3 gpm, a maximum drawdown of between 5 7 and 5 3 feet was maintained Drawdown during the 3-day aquifer test, as recorded by the data logger, are presented in ' Appendix D The data include date, elapsed time, and drawdown for each data logger probe location Table 3 summarizes the wells that were monitored, shows the maximum drawdown ' experienced at each well during the pumping test, and the radial distance from each monitored well to the pumping well Analytical results of samples collected from well EW-1 on October 19 and 26, 1993, during and after the pumping test are summarized in Table 4 Laboratory analytical reports are included in ' Appendix A ' 514 Data Analysis Graphical analyses for each well were performed based on the field-derived data The graphical ' analyses were obtained by computer-assisted matching of type-curves and field data When a successful match was achieved, the computer calculated the aquifer characteristics of storativity, hydraulic conductivity, and transmissivity The drawdown data from each of the monitoring wells was analyzed using Thus curve matching ' techniques Theis type curve matches made for the drawdown at the pumping well and three monitored observation wells (EW-1, OB-1, OB-2, and 013-3) are presented in Appendix E Table 5 ' summarizes the results of the aquifer analysis ' Storativity (S) is defined as the volume of water released from storage per unit surface area of the aquifer per unit change in head In confined aquifers, this is the result of compression of the aquifer ' 2819R034 070 GROUNDWATER ' HF9 TECHNOLOGY, INC