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J <br /> ; s <br /> F <br /> r <br /> lel <br /> rba j <br /> q P-2 fl <br /> ( <br /> 14 ni ri W I Gravel agk and Slat Size Selatinrt t` <br /> :<y r. <br /> Thesize of the gravel pack that was plated adjacent to the well screen was determined by the project <br /> r ' � <br /> manager based on an estimation of the distribution of grain size in the formation which is likely to be <br /> encountered within the uppermost saturated zone at the si e. Available geologic information was utilized € <br /> i <br /> in the selection of this grain size. The gravel pack wa selected such that it will permit the development of r I <br /> a zone of the higher hydraulic conductivity adjacent to the well screen but will not allow piping of the. <br /> finer-grained formation into the well bore. The slot size of the well screen was selected such that it will <br /> t, <br /> retain a minimttm of 95 percent of the gravel pack material. <br /> EY:1 <br /> 1,5 MonitorinQ Well Develonment <br /> After monitoring wells were installed, each monitoringwell was developed f <br /> :. ped after caastnction with a <br /> s 1.75-inch-diameter bailer until the water produced was relatively sediment-free or until <br /> measurements ofpH, . <br /> ? 4 <br /> I F specific conductance,and temperature stabilize. filo water or chemicals were introduced into the monitoring <br /> wells during well development. All developed water was placed in drums on site For later disposal: € <br /> f <br /> l N 1.6 faround Water Sampling <br /> i <br /> A minimum of 24 hours following well development,and after water levels have been allowed to stabilize i <br /> in the well, 3 to 5 wetted casing volumes of liquid was removed from each well by baiting with a r <br /> E <br /> 7I laboratory-cleaned teflon baiter. Measurements of pH,specific conductance,and temperature had beer•made [ <br /> at regular intervals during this procedure. Removal of liquid from each well_t-as continued.until.the <br /> ..f measurement of pH, specific conductance, and temperature had stabilized. A li,lttid sample was then <br /> collected from each well with a laboratory-cleaned,dedicated teflon bailer. Each sample was tppropriatrly <br /> labeled and stored on ice from the time of collection through the time of delivery to tha laboratory. Ground <br /> water samples were transported to the laboratory and analyzed with in the EPA-specified holding time for <br /> + the requested analyses. <br /> �. 2QUALITY ASSMNCE PLAN ` <br /> f <br /> i This item describes the field and analytical procedures to be followed throughout the investigation. S <br /> 3 Gena] Sarniple Collection and Handling Procedures <br /> Proper collection and handling are essential to ensure the quality of a sample. Each sam le was collected t <br /> in a suitable container,preserved correctly for the intended analysis, and stared prior to analysis for no 4� <br /> ins <br /> �t <br /> 5, <br />