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Pilot Testing Report and Conceptual Corrective Action Plan July 15, 1994 <br /> Manna Pro, 4004 South EI Dorado, Stockton, CA 12 <br /> test was conducted by extracting groundwater at a constant rate to depress the groundwater table <br /> at the extraction well and measuring groundwater level fluctuations at adjacent observation and <br /> monitoring wells Groundwater-level data was analyzed using computer modeling simulations to <br /> estimate the aquifer parameters and the predicted capture zone for extraction wells Hydraulic <br />' conductivity and storativity coefficients for the unit were estimated based on curve-matching <br /> techniques These parameters are required for estimating groundwater flow and using numerical <br /> modeling to predict the migration of dissolved-phase hydrocarbons through the subsurface <br /> Additionally, the aquifer test data provide necessary information to evaluate the feasibility and <br /> effectiveness of a groundwater recovery system designed to capture dissolved-phase hydrocarbons <br /> Groundwater monitoring conducted at the site to date indicated that the plume of dissolved-phase <br />' hydrocarbons lies in the northern portion of the site between monitoring well MW-2 and monitoring <br /> wells MW-8 and MW-9 The newly installed well (EW-1), located within the area of highest <br />' concentrations, was used as the extraction well during the test Monitoring wells MW-1, MW-3, <br /> MW-6, MW-10, 013-1, OB-2, and OB-3 were used as observation wells <br /> As part of the test, the following measurements were recorded <br />' The total number of gallons of groundwater extracted, <br /> • Average flow rates, <br /> • Depth to groundwater prior to pumping, <br /> • Depth to groundwater at the termination of the pumping, <br /> • Continuous water level measurements at EW-1 and the 3 observation wells for 48 <br /> • hours under static conditions (pretest data), <br /> Continuous drawdown measurements at EW-1 and the 3 observation wells in <br /> response to the groundwater pumping, <br />' Periodic water level measurements at 4 additional monitoring wells, and <br />' Radial distances from the pumping well to the observation and monitoring wells <br /> In addition, groundwater samples were collected for laboratory analysis for BTEX, TPH-G, and <br />' TPH-D from EW-1 during and following the aquifer test <br /> • <br />' 2e79ao34 opo DEN <br /> GROUNDWATER <br /> TECHNOLOGY, INC <br />