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i <br /> t <br /> `- APPENDIX D <br /> Methoda,Analytical Procedure., <br /> Quality Aaauranee Plan,and <br /> sito Safety Plan <br /> Pate D7 <br /> 4 nl in W I r v i ld Slotz i <br /> on <br /> f The size of 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 zone at the site. Available geologic <br /> is <br /> information will be utilized in the selection of this grain size. The gravel pack will be selected such <br /> i that it-ill permit the development of a zone of higher hydraulic conductivity adjacent to the well <br /> l: screen but will not allow piping of the finer-grained soil constituents into the well bore. The slot <br /> size of the well screen will be selected such that it will retain a minimum of 90 percent of the gravel <br /> i pack material. <br /> i , <br /> 3 <br /> ;'{ 1'�Monitoring Well Lerglorm��4 <br /> t s If monitoring wells are installed,each monittAng well will be developed after construction with a <br /> 1.75-inch-diameter manual pump until the water produced is relatively sediment free, or until <br /> #'F <br /> meas►trements of pH, specific conductance, and temperature stabilize. ?: the well is pumped dry <br /> [ k' <br /> during the development process, recharged rates will be recorded. No water or chemicals will be <br /> introduced into the monitoring wells during well development. All developed water will be placed <br /> t in drums on site for later disposal. <br /> r, 1 Petr taum Product <br /> If free petroleum product is present in a well, the thickness of the product layer will be measured <br /> by collecting a sample in a transparent teflon bailer with a check valve at the bottom, or by <br /> k`e measurement using appropriate fluid-level sounding equipment. The sample will be transferred to <br /> an appropriate sample container and subsequently submitted for fuel fingerprint analysis at the <br /> laboratory. <br /> 1.7 Ground %V er "i_ Piing <br /> y A minimum of 24 hours following well development, and after water levels have been allowed to <br /> 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. Measurements of pH,specific conductance,and <br /> temperature will be made at regular intervals during this procedure. Removal of liquid from each <br /> well will continue until the measurement pH,specific conductance,and temperature have stabilized. <br />