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' Aquifer Testing Work Plan • • FormerFacility 1905 Northrth Broadway Avenue - Stockton,California Sierra-Pacific Project No. 94-055.05 for each of the tests to be performed. Sierra-Pacific anticipates approximately 400 readings per 8-hour test. ' After setting and securing the pressure transducers in each of the wells, an initial reading of the transducers will be performed and stored in the data logger. Subsequently the embedded software in the ' data logger will automatically convert the direct current values returned by the pressure transducers to an equivalent change in water depth above the transducer. These data will be recorded in the data logger file. Upon completion of the tests,the water depth readings will be down-loaded to Sierra-Pacific's field computer for subsequent analysis. ' A 4-inch-diameter Fairbanks-Morse submersible pump will be installed at E-1 for the aquifer tests. The ' pump is rated for a capacity of 20 gallons per minute (gpm) under a hydraulic head of 90 feet. The achieved pumping rate will vary due to restricted well yield during the tests. During subsequent aquifer tests,the pumping rate will be held at some fixed rate determined by earlier tests. Assuming a pumping rate of 10 to 15 gpm, each 8-hour aquifer test will generate about 6,000 gallons of purge water. The ' contaminated water will be pumped into large portable storage tanks with two-inch PVC pipes. ' Water levels at four existing monitoring wells(MW-1,MW-2,MW-8,MW-7)and Western's production well(WFS)will be measured periodically throughout the aquifer tests. Some of these wells will likely ' be outside the cone of depression of the extraction well E-1. The manual ground water level data will be collected using a Solinst®electric water level sounder, and will be measured to the nearest 0.01 feet ' from a surveyed point on the well casing. ' 4.11 Analyze Water Level Data and Geologic Information The recorded pressure transducer data will be transferred from the Global Water® data logger to a ' microcomputer,using the LS-4M Data Logger Software®,by Lakewood Systems,Inc. The raw data will then be transferred to Microsoft Excel software,where graphs of displacement(draw-down)versus time will be prepared. Next,the draw-down data will be pre-processed by mathematically subtracting out any natural head loss or gain from each transducer reading. Additionally,file headers and other text will be ' SIERRA-PACIFIC GROUP 12 1