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OR <br /> -wir.IR- E <br /> F� <br /> PHASE I HYI3ltGGEOLOGIC INVESi7GATIDN 1VORK PLAN <br /> 44?1 West Durham Ferry Road,Tracy,California <br /> Della Praject Na.40.91-732 <br /> Page 5 <br /> 3.7 Ground Water Sam lin <br /> i <br /> i Following well devely mel3t and after water levels have <br /> p 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 Le conducted at regular intervals during this procedure Removr,!of water from each <br /> I monitoring well will continue anti!the measured pH,specific conductance,and temperature have Stabilized. <br /> A mound water sample will then be collected from each monitoring well with a dedicated,disposable ba ler. <br /> Each sample will be appropriately labeled and stored on ice from the time of oolIectivn through the time <br /> of delivery to the laboratory. Ground water samples will be transported to the laboratory and analyzed <br /> within the EPA-specified holding times'tor the requested analyses, <br /> 3.5 Chemical ARsyses <br /> Selected soil samples collected from the soil borings and ground water samples collected from the monitoring <br /> wells will be sent to a state-certified laboratory for chemical analyses. Soil and ground water samples will <br /> x be analy7od for 7TH as gasoline and BTEX.by EPA Methods 8015,and 8010,respectively. <br /> '°. a 3,g Sur►' <br /> Horizontal and vertical surveys will T c conducted to determine horizontal location and top-of-casing <br /> U elevations for the thmc monitoring wells. <br /> 110 Underground Ujilltfes <br /> A F -w soil borings will be marked,then Under�und Service Alert will be notified. As a preventative measure <br /> for encountering utilities during drilling,Dell's will require that the initial 5 feet of drilling be perforin-ed <br /> using a hand auger. <br /> 4.0 PRELI,4IINARY RE['ORT PREPARATION <br /> An investigation report will be prepared following completion of field activities: The report will provide a <br /> summary of field activities and t bservati(. "round water and soil sampling procedures,analytical results, <br /> monitoring well completion diagrams and liLIwI,t,;c descriptions,depth.to..gound.water-and groundwater —– - <br /> ow direction data,and conclusions and recommendations. <br /> - i. <br />