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5tantec <br /> 2010 TIDEWATER STOCKTON WORK PLAN <br /> 3.2.5 Reporting <br /> The data collected through the implementation of this work plan will be included in a results <br /> report following completion of all field work and receipt of all analytical data. <br /> 3.3 UOU EXTRACTION WELL INSTALLATION AND AQUIFER TESTING <br /> Following drilling at the WFT, two groundwater extraction wells (GWE-1 through GWE-2) will be <br /> installed into the existing groundwater collection trench (GCT) previously installed by the RDA <br /> during excavation activities that took place on the UOU in late 2008 and early 2009. <br /> The extraction wells will be designed to recover groundwater in the collection trench which is <br /> approximately 16 feet bgs and three feet wide. The trench is backfilled with two-inch drain rock <br /> and lined with filter fabric. The recovery trench is overlain with an additional 18 inches of <br /> drainage rock with the remainder fill material to ground surface. The purpose of these wells will <br /> be to perform aquifer testing to determine information necessary to design appropriate <br /> extraction and treatment methods for groundwater collected in the collection trench. <br /> The following tasks will be completed during this phase of the work plan: <br /> • Task 1 — Installation of groundwater extraction wells (GWE-1 and GWE-2); <br /> • Task 2— Recovery well aquifer test; <br /> • Task 3—Analytical laboratory testing; <br /> • Task 4—Waste Management; and <br /> • Task 5— Data analysis and reporting. <br /> Details of each task are described below: <br /> 3.3.1 Task 1 — Installation of GWE Wells <br /> Groundwater extraction wells (GWE-1 and GWE-2) will be installed in order to extract <br /> groundwater from the GCT (the base of the trench is approximately 16 feet bgs and is generally <br /> sloped down north to south) previously installed by the RDA. A well construction detail is <br /> included as Figure 4. <br /> The advancement of the soil borings and the well completions will be performed by a California <br /> licensed driller and drilling oversight will be performed under the direction of a Stantec <br /> Professional Geologist. Boreholes will be advanced as described below or to drilling refusal. <br /> Prior to installation of the GWE wells a surveyor will be employed to pinpoint the appropriate <br /> boring locations directly above the GCT based on coordinates provided by the RDA. The final <br /> locations of the boring will also be based on the location of overhead and underground utilities. <br /> 3.10 <br />