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i <br /> _ I <br /> GIC 1NVFSftGATION WORK PIAN <br /> 4191 Wert Durham Ferry Road,Tracy,Ca':fbrnia <br /> Delta Project Din.40.92.73$ <br /> Page S <br /> Ground <br /> Following well development and after water levels have been allowed to stabilize in the wells,three to five <br /> well casing volumes of water will be removed from each well by bailing with a bailer. Purged ground water <br /> will be contained in 55-gallon drums for later disposal. Measurements of pH,specific conductance,and <br /> temperature will be conducted at regular intervals during this procedure. Removal of water from each <br /> ntonitoting well will continue until the measured pH,specific conductance,and temperature have stabilized. <br /> A ground water sample will then be collected from each monitoring well with a dedicat4 disposable bailer. <br /> Each sample w-11!be appropm- tely labeled and stored on ice from the time of collection through the time <br /> t <br /> of delivery to the laboratory. Ground water samples will be transported to the laboratory and analyzed <br /> ^� within the EPA-specified holding times for the requested analyses. <br /> I <br /> _ Chemleal Attar <br /> Selected soil samples collected from the.oil boring and ground water samples collected from the monitoring <br /> (i wells will be sent to a state-certified laboratory for chemical analyses. Soil and ground water samples will <br /> E be analyzed for TPH as gasoline and BTEX by EPA Methods 8015,and 8MO,respectively. <br /> 1 Horizontal and vertical surveys will be conducted to determine horizontal location and top-of-rasing <br /> elevations for the three monitoring wells. <br /> Utilities <br /> - Alt soil borings will be marked,then Underground Service Alert will be not'if'ied. Asa preventative measure <br /> f <br /> for altcounterin$utilities during d:illiun,Delta will require that the initial 5 feet of drilling be l-rformed <br /> using a hand anger. <br /> i <br /> 4.0 PRELIMINARY REPORT tUPARATfON <br /> -f.. _. <br /> j An investigation report will be prepared following completion of field activities. The reporthill provide a <br /> j summary of field activities and observations,ground water and soil sampling procedures,analytical results, <br /> -� monitoring well completion diagrams and lithologic descriptions,depth to ground water and ground water <br /> flow direction data,and conclusions and recommendations. <br /> I <br />