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I l 4 Monitoring Well Gravel Pack and Sloth 5-495; yn { The size of the graves pack that was plated adjacent to the well W i,te:y:�•' �l.'�y the pttsjerJt manager based on an estimation of the distribution of grain size in the formatk9n which is likely to be encountered within the uppermost saturated zone at the site. Available geologic infotutation was twined in the selection of his grain size. The gravel pack wa selected such that it will permit the development of a zone of the higher hydraulic conductivity adjacent to the well screen but will not allow piping of the fuser-grained fordtiadon into the well bore. The slot size of the well screen was selected such that it frill retain a minimum of 95 percent of the gravel pack material. i After monitoring wells were installed, each monitoring well was developed after rnmstruction with a ;1.75-inch-diameter bailer until the water produced was relatively sediment-free or until measurements of pH, specific conductance,and temperature stabilize. No water or chemicals were introduced into the monitoring _ wells during well development. All developed bracer was placed in drums on site for later disposal. ..i 71 1.6 Ground dater Sill A minimum of 24 hours following well development,and after water Ic4els have l>ecz allowed to stabilize in the well, to 5 wetted casing volumes of liquid w2s removed from each well by bailing with a laboratory-cleansd teflon bailer. Measurements of pH,specific conductance,and temperature-had been made .! at regular intervals during this procedure. Removal of liquid from each well was continued until the meas retilient of pH, specific conductt:nce, and temperature had stabilized. A liquid sample was thea collected from each well with a laboratory-cleaned,dedicated teflon bailer. Each sample was approprlately s ��,,:• labeled and stored on ice from the time of collection through the time of delivery to the laboratory. Ground water samples were transported to the laboratory and analyzed with in the EPA-specified holding time for j the requested analyses. " s_n 0116MY Y ASSURANCE ELAN This item describes the field and analytical procedures to be followed throughout the Investigation. ' Proper collection and Im"Ing are essential to etLsure the quality of a sample. Each sample was collected in a suitable container, preserved eoriiectly for the intended analysis, and stored prior to analysis for no. ' r.-