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- .w aP - <br /> MON <br /> r <br /> Y <br /> '� �ttltorin¢WeII Cfnvgl par& 8tlft Stnf CE _Selection <br /> The size or the gravel pack that will be placed adjacent to the well screen will be determined by the <br /> Project manager based on an estimation of the distribution of grain size in the formation which is <br /> likely to be encountered within the uppermost saturated zoaa at the site. Available geologic <br /> information will be utilized in the selection of this grain size. The gravel pack will be selected such <br /> that it will permit the development of a zone of higher hydraulic conductivity adjacent to the well <br /> screen but will Iie'allow piping of the finer-grained formation into the well bore. The slot size of <br /> f the Well screen will be selected such that it will retain a minimum of 95 percent of the gravel pack <br /> material. <br /> i Each monitoring well will be developed after construction with a 1.75-inch-diameter manual pump <br /> f <br /> or by bailing until the water produced is relatively sediment-free or until measurements of pH, . <br /> specific conductance,and temperature stabilize. If the well is pumped dry during the development <br /> 1 process, recharge rates will be recorded. No water or chemicals will be introduced into the <br /> monitoring wells during well development. All developed water will be placed in drums on site for <br /> later disposal. t <br /> Q <br /> W 1 <br /> A minimum of 24 hours following well development, and after water levels have been allowed to <br /> # r" stabilize in the well, three to five wetted casing volumes of liquid will be removed from each well <br /> by bailing with a laboratory-cleaned teflon bailer. Measurement of PH,specific conductance,and <br /> l� temperature will be made at regular intervals during this procedure. Removal of liquid from each <br /> well will continue until the measurement of pH, specific conductance, and temperature have <br /> stabilized. A liquid sample will then be collected from each well with a laboratory-cleaned, <br /> dedicated teflon bailer. Each sample will be <br /> F ilp appropriately labeled and stored on ice from the time <br /> r„t of collection through the time of delivery to the laboratory. Ground water samples will be <br /> transported to the Iaboratory and analyzed within the EPA-specified holding times for the re uested <br /> analyses. q <br /> Ground water analysis of samples for water quality parameters presented in Table 5 and discussed <br /> in Section 4.2.4 of this report will be preformed by a t - qgg I borat. pry. EPA analytical <br /> ' y - <br /> methods and detection limits are presented in Table 5. Samples will be filtered with a filtration kit <br /> -_--f f t..--- _ -_ supplied by the analytical laboratory.-.. The a-glass funnel, filter:soperss <br /> ,—acid gla ---- - ' --- — <br /> -- - <br /> ,, flashes. Because some ground water.samples require specific preservation for various parameters, <br /> l they will be separated into three flashes (aliquote samples). Each of the aliquotes will contain <br /> preservation constituents inserted into the flash by the Iaboratory prior to shipping the sampling flash. <br /> to Delta. The preservation constituents used will be in accordance withthe 1984 EPA Laboratory <br /> t Manual,SW846, Water and Waste Water Methods. <br /> s <br /> S <br /> W <br />